summaryrefslogtreecommitdiffstats
path: root/wsrep-lib/wsrep-API/v26
diff options
context:
space:
mode:
Diffstat (limited to '')
-rw-r--r--wsrep-lib/wsrep-API/v26/.gitignore10
-rw-r--r--wsrep-lib/wsrep-API/v26/CMakeLists.txt30
-rw-r--r--wsrep-lib/wsrep-API/v26/CONTRIBUTORS.txt28
-rw-r--r--wsrep-lib/wsrep-API/v26/CONTRIBUTOR_AGREEMENT.txt218
-rw-r--r--wsrep-lib/wsrep-API/v26/COPYING339
-rw-r--r--wsrep-lib/wsrep-API/v26/README.md7
-rw-r--r--wsrep-lib/wsrep-API/v26/examples/CMakeLists.txt19
-rw-r--r--wsrep-lib/wsrep-API/v26/examples/README.md14
-rw-r--r--wsrep-lib/wsrep-API/v26/examples/listener.c268
-rw-r--r--wsrep-lib/wsrep-API/v26/examples/node/CMakeLists.txt26
-rw-r--r--wsrep-lib/wsrep-API/v26/examples/node/README.md81
-rw-r--r--wsrep-lib/wsrep-API/v26/examples/node/ctx.h34
-rw-r--r--wsrep-lib/wsrep-API/v26/examples/node/log.c100
-rw-r--r--wsrep-lib/wsrep-API/v26/examples/node/log.h69
-rw-r--r--wsrep-lib/wsrep-API/v26/examples/node/main.c146
-rwxr-xr-xwsrep-lib/wsrep-API/v26/examples/node/node.sh40
-rw-r--r--wsrep-lib/wsrep-API/v26/examples/node/options.c291
-rw-r--r--wsrep-lib/wsrep-API/v26/examples/node/options.h48
-rw-r--r--wsrep-lib/wsrep-API/v26/examples/node/socket.c304
-rw-r--r--wsrep-lib/wsrep-API/v26/examples/node/socket.h72
-rw-r--r--wsrep-lib/wsrep-API/v26/examples/node/sst.c372
-rw-r--r--wsrep-lib/wsrep-API/v26/examples/node/sst.h39
-rw-r--r--wsrep-lib/wsrep-API/v26/examples/node/stats.c215
-rw-r--r--wsrep-lib/wsrep-API/v26/examples/node/stats.h35
-rw-r--r--wsrep-lib/wsrep-API/v26/examples/node/store.c1044
-rw-r--r--wsrep-lib/wsrep-API/v26/examples/node/store.h125
-rw-r--r--wsrep-lib/wsrep-API/v26/examples/node/trx.c155
-rw-r--r--wsrep-lib/wsrep-API/v26/examples/node/trx.h50
-rw-r--r--wsrep-lib/wsrep-API/v26/examples/node/worker.c197
-rw-r--r--wsrep-lib/wsrep-API/v26/examples/node/worker.h66
-rw-r--r--wsrep-lib/wsrep-API/v26/examples/node/wsrep.c479
-rw-r--r--wsrep-lib/wsrep-API/v26/examples/node/wsrep.h92
-rw-r--r--wsrep-lib/wsrep-API/v26/wsrep.xcfbin0 -> 79281 bytes
-rw-r--r--wsrep-lib/wsrep-API/v26/wsrep_allowlist_service.h100
-rw-r--r--wsrep-lib/wsrep-API/v26/wsrep_api.h1380
-rw-r--r--wsrep-lib/wsrep-API/v26/wsrep_dummy.c462
-rw-r--r--wsrep-lib/wsrep-API/v26/wsrep_event_service.h105
-rw-r--r--wsrep-lib/wsrep-API/v26/wsrep_gtid.c77
-rw-r--r--wsrep-lib/wsrep-API/v26/wsrep_loader.c239
-rw-r--r--wsrep-lib/wsrep-API/v26/wsrep_membership_service.h138
-rw-r--r--wsrep-lib/wsrep-API/v26/wsrep_thread_service.h355
-rw-r--r--wsrep-lib/wsrep-API/v26/wsrep_tls_service.h326
-rw-r--r--wsrep-lib/wsrep-API/v26/wsrep_uuid.c94
43 files changed, 8289 insertions, 0 deletions
diff --git a/wsrep-lib/wsrep-API/v26/.gitignore b/wsrep-lib/wsrep-API/v26/.gitignore
new file mode 100644
index 00000000..4ec5efc6
--- /dev/null
+++ b/wsrep-lib/wsrep-API/v26/.gitignore
@@ -0,0 +1,10 @@
+*~
+*.o
+*.a
+*.diff
+listener
+CMakeFiles
+CMakeCache.txt
+cmake_install.cmake
+Makefile
+examples/node/node
diff --git a/wsrep-lib/wsrep-API/v26/CMakeLists.txt b/wsrep-lib/wsrep-API/v26/CMakeLists.txt
new file mode 100644
index 00000000..bd66d989
--- /dev/null
+++ b/wsrep-lib/wsrep-API/v26/CMakeLists.txt
@@ -0,0 +1,30 @@
+# Copyright (c) 2018, Codership Oy. All rights reserved.
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; version 2 of the License.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+
+CMAKE_MINIMUM_REQUIRED(VERSION 2.8)
+
+INCLUDE_DIRECTORIES(".")
+
+SET(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wall -Wextra -Werror -Wconversion")
+
+IF (NOT CMAKE_BUILD_TYPE)
+ SET(CMAKE_BUILD_TYPE Release)
+ENDIF()
+
+SET(WSREP_SOURCES wsrep_gtid.c wsrep_uuid.c wsrep_loader.c wsrep_dummy.c)
+
+ADD_LIBRARY(wsrep ${WSREP_SOURCES})
+
+ADD_SUBDIRECTORY(examples)
diff --git a/wsrep-lib/wsrep-API/v26/CONTRIBUTORS.txt b/wsrep-lib/wsrep-API/v26/CONTRIBUTORS.txt
new file mode 100644
index 00000000..2943b885
--- /dev/null
+++ b/wsrep-lib/wsrep-API/v26/CONTRIBUTORS.txt
@@ -0,0 +1,28 @@
+All contributors are required to add their name and [Github username/email]
+to this file in connection with their first contribution. If you are making
+a contribution on behalf of a company, you should add the said company name.
+
+By adding your name and [Github username/email] to this file you agree that
+your contribution is a contribution under a contributor agreement between
+you and Codership Oy. To the extent that you are an employee of a company and
+contribute in that role, you confirm that your contribution is a contribution
+under the contribution license agreement between your employer and Codership
+Oy; and that you have the authorization to give such confirmation. You confirm
+that you have read, understood and signed the contributor license agreement
+applicable to you.
+
+For the individual contributor agreement see file CONTRIBUTOR_AGREEMENT.txt
+in the same directory as this file.
+
+Authors from Codership Oy:
+
+ * Seppo Jaakola <seppo.jaakola@galeracluster.com>, Codership Oy
+ * Teemu Ollakka <teemu.ollakka@galeracluster.com>, Codership Oy
+ * Alexey Yurchenko <alexey.yurchenko@galeracluster.com>, Codership Oy
+ * Mario Karuza <mario.karuza@galeracluster.com>, Codership Oy
+ * Daniele Sciascia <daniele.sciascia@galeracluster.com>, Codership Oy
+ [Codership employees, add name and email/username above this line, but leave this line intact]
+
+Other contributors:
+
+ [add name and email/username above this line, but leave this line intact]
diff --git a/wsrep-lib/wsrep-API/v26/CONTRIBUTOR_AGREEMENT.txt b/wsrep-lib/wsrep-API/v26/CONTRIBUTOR_AGREEMENT.txt
new file mode 100644
index 00000000..8bdec2fd
--- /dev/null
+++ b/wsrep-lib/wsrep-API/v26/CONTRIBUTOR_AGREEMENT.txt
@@ -0,0 +1,218 @@
+ Codership
+ Contributor License Agreement
+ Codership CLA
+
+Thank you for your interest in contributing to Galera Cluster, a project
+managed by Codership Oy, a legal entity established under Finnish laws, with
+its principal address at Pohjolankatu 64 A, 00600 Helsinki Finland ("We", "Us"
+or "Our").
+
+This contributor agreement ("Agreement") documents the rights granted by
+contributors to Us. To make this document effective, please either accept it
+in an electronic service such as clahub.com or sign and scan it and send it to
+Us by email. This is a legally binding document, so please read it carefully
+before agreeing to it. This Agreement covers the Galera Cluster project: the
+Galera library, the wsrep-lib library, the wsrep-API library, the Wsrep patch
+for MySQL and other eventual patches to MySQL or other technologies.
+
+1. Definitions
+
+"You" means the individual who Submits a Contribution to Us or the Legal
+Entity on behalf of whom a Contribution has been Submitted to Us. "Legal
+Entity" means an entity which is not a natural person. "Affiliates" means
+other Legal Entities that control, are controlled by, or under common control
+with that Legal Entity. For the purposes of this definition, "control" means
+(i) the power, direct or indirect, to cause the direction or management of
+such Legal Entity, whether by contract or otherwise, (ii) ownership of fifty
+percent (50%) or more of the outstanding shares or securities which vote to
+elect the management or other persons who direct such Legal Entity or (iii)
+beneficial ownership of such entity.
+
+"Contribution" means any work of authorship that is Submitted by You to Us in
+which You own or assert ownership of the Copyright. If You do not own the
+Copyright in the entire work of authorship, you need to have a separate
+permission from Us.
+
+"Copyright" means all rights protecting works of authorship owned or
+controlled by You, including copyright, moral and neighboring rights, as
+appropriate, for the full term of their existence including any extensions by
+You.
+
+"Material" means the work of authorship which is made available by Us to third
+parties, i.e. the Galera library, the Wsrep patch for MySQL; other eventual
+patches to MySQL; other eventual patches to other database technologies; all
+these together with a database technology, such as MySQL, or its
+derivatives. After You Submit the Contribution, it may be included in the
+Material.
+
+"Submit" means any form of electronic, verbal, or written communication sent
+to Us or our representatives, including but not limited to electronic mailing
+lists, source code control systems, and issue tracking systems that are
+managed by, or on behalf of, Us for the purpose of discussing and improving
+the Material, provided that such communication is (i) conspicuously marked or
+otherwise designated in writing by You or Your employee as a "Contribution" or
+(ii) submitted in source code control system pursuant to Section 3 (e).
+
+"Submission Date" means the date on which You Submit a Contribution to Us.
+
+"Effective Date" means the date You execute this Agreement or the date You
+first Submit a Contribution to Us, whichever is earlier.
+
+"Media" means any portion of a Contribution which is not software.
+
+2. Grant of Rights
+
+2.1 Copyright License
+
+(a) You retain ownership of the Copyright in Your Contribution and have the
+same rights to use or license the Contribution which You would have had
+without entering into the Agreement. In case we have in writing permitted
+submitting a sublicense to licensed rights, You will not transfer the original
+license, but grant us a sublicense in accordance with this Agreement.
+
+(b) To the maximum extent permitted by the relevant law, You grant to Us a
+perpetual, worldwide, non-exclusive, transferable, royalty-free, irrevocable
+license under the Copyright covering the Contribution, with the right to
+sublicense such rights through multiple tiers of sublicensees, to reproduce,
+modify, display, perform and distribute the Contribution as part of the
+Material; provided that this license is conditioned upon compliance with
+Section 2.3.
+
+2.2 Patent License
+
+For patent claims including, without limitation, method, process, and
+apparatus claims which You, or in case You are a Legal Entity, You or Your
+Affiliates, own, control or have the right to grant, now or in the future, You
+grant to Us a perpetual, worldwide, non-exclusive, transferable, royalty-free,
+irrevocable patent license, with the right to sublicense these rights to
+multiple tiers of sublicensees, to make, have made, use, sell, offer for sale,
+import and otherwise transfer the Contribution and the Contribution in
+combination with the Material (and portions of such combination). This license
+is granted only to the extent that the exercise of the licensed rights
+infringes such patent claims; and provided that this license is conditioned
+upon compliance with Section 2.3.
+
+2.3 Outbound License
+
+As a condition on the grant of rights in Sections 2.1 and 2.2, to the extent
+we include Your Contribution or a part of it in a Material, we agree to
+license the Contribution under the terms of the license or licenses which We
+are using on the Submission Date for the Material or any licenses which are
+approved by the Open Source Initiative ("OSI") on or after the Effective Date,
+including both permissive and copyleft licenses, whether or not such licenses
+are subsequently disapproved (including any right to adopt any future version
+of a license if approved by the OSI). For clarity, this entitles us to license
+Your Contribution also under a permissive open source license, such as the MIT
+license, and include binaries created under the MIT license in a proprietary
+licensed whole.
+
+In addition to above defined licenses, We may use the following licenses for
+Media in the Contribution: Creative Commons BY 3.0 or Creative Commons BY-SA
+3.0 (including the right to adopt any future version of a license).
+
+2.4 Moral Rights.
+
+If moral rights apply to the Contribution, to the maximum extent permitted by
+law, You waive and agree not to assert such moral rights against Us or our
+successors in interest, or any of our licensees, either direct or indirect.
+
+2.5 Enforcement.
+
+You, as a copyright holder to Your Contribution, hereby authorize us to
+enforce the OSI approved license applied by Us to a Material, but only to the
+extent Your Contribution has been included in a Material and always subject to
+Our free discretion on whether such enforcement is necessary or not.
+
+2.6 Our Rights.
+
+You acknowledge that We are not obligated to use Your Contribution as part of
+the Material and may decide to include any Contribution We consider
+appropriate.
+
+2.7 Reservation of Rights.
+
+Any rights not expressly licensed under this section are expressly reserved by
+You.
+
+3. Agreement
+
+You confirm that:
+
+(a) You have the legal authority to enter into this Agreement.
+
+(b) You or Your Affiliates, own the Copyright and patent claims covering the
+ Contribution which are required to grant the rights under Section 2.
+
+(c) The grant of rights under Section 2 does not violate any grant of rights
+ which You or Your Affiliates have made to third parties, including Your
+ employer. If You are an employee, You have had Your employer approve this
+ Agreement or sign the Entity version of this document. If You are less
+ than eighteen years old, please have Your parents or guardian sign the
+ Agreement.
+
+(d) You have not Submitted any Code You do not own without written permission
+ from US.
+
+(e) All pull or merge requests issued under usernames confirmed by You in
+ writing are issued by You; and all such pull or merge requests contain
+ Your Contributions under this Agreement. You will notify Us in writing in
+ the event of You no longer control such usernames.
+
+4. Disclaimer
+
+EXCEPT FOR THE EXPRESS WARRANTIES IN SECTION 3, THE CONTRIBUTION IS PROVIDED
+"AS IS". MORE PARTICULARLY, ALL EXPRESS OR IMPLIED WARRANTIES INCLUDING,
+WITHOUT LIMITATION, ANY IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A
+PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE EXPRESSLY DISCLAIMED BY YOU TO
+US. TO THE EXTENT THAT ANY SUCH WARRANTIES CANNOT BE DISCLAIMED, SUCH WARRANTY
+IS LIMITED IN DURATION TO THE MINIMUM PERIOD PERMITTED BY LAW.
+
+5. Consequential Damage Waiver
+
+TO THE MAXIMUM EXTENT PERMITTED BY APPLICABLE LAW, IN NO EVENT WILL YOU BE
+LIABLE FOR ANY LOSS OF PROFITS, LOSS OF ANTICIPATED SAVINGS, LOSS OF DATA,
+INDIRECT, SPECIAL, INCIDENTAL, CONSEQUENTIAL AND EXEMPLARY DAMAGES ARISING OUT
+OF THIS AGREEMENT REGARDLESS OF THE LEGAL OR EQUITABLE THEORY (CONTRACT, TORT
+OR OTHERWISE) UPON WHICH THE CLAIM IS BASED.
+
+THIS WAIVER DOES NOT APPLY TO GROSS NEGLIGENT OR MALICIOUS ACTS OR FRAUD.
+
+6. Miscellaneous
+
+6.1 This Agreement will be governed by and construed in accordance with the
+laws of Finland excluding its conflicts of law provisions. Under certain
+circumstances, the governing law in this section might be superseded by the
+United Nations Convention on Contracts for the International Sale of Goods
+("UN Convention") and the parties intend to avoid the application of the UN
+Convention to this Agreement and, thus, exclude the application of the UN
+Convention in its entirety to this Agreement.
+
+6.2 Any and all Submissions done by You prior to execution of this Agreement
+shall be nonetheless covered by this Agreement.
+
+6.3 This Agreement sets out the entire agreement between You and Us for Your
+Contributions to Us and overrides all other agreements or understandings.
+
+6.4 If You or We assign the rights or obligations received through this
+Agreement to a third party, as a condition of the assignment, that third party
+must agree in writing to abide by all the rights and obligations in the
+Agreement.
+
+6.5 The failure of either party to require performance by the other party of
+any provision of this Agreement in one situation shall not affect the right of
+a party to require such performance at any time in the future. A waiver of
+performance under a provision in one situation shall not be considered a
+waiver of the performance of the provision in the future or a waiver of the
+provision in its entirety.
+
+6.6 If any provision of this Agreement is found void and unenforceable, such
+provision will be replaced to the extent possible with a provision that comes
+closest to the meaning of the original provision and which is enforceable.
+The terms and conditions set forth in this Agreement shall apply
+notwithstanding any failure of essential purpose of this Agreement or any
+limited remedy to the maximum extent possible under law.
+
+This document has been drafted based on Harmony Inividual Contributor License
+Agreement (HA-CLA-I) Version 1.0 July 4, 2011. HA-CLA-I is available from
+harmonyagreements.org and is licensed by under Creative Commons Attribution
+3.0 Unported License.
diff --git a/wsrep-lib/wsrep-API/v26/COPYING b/wsrep-lib/wsrep-API/v26/COPYING
new file mode 100644
index 00000000..d159169d
--- /dev/null
+++ b/wsrep-lib/wsrep-API/v26/COPYING
@@ -0,0 +1,339 @@
+ GNU GENERAL PUBLIC LICENSE
+ Version 2, June 1991
+
+ Copyright (C) 1989, 1991 Free Software Foundation, Inc.,
+ 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+ Preamble
+
+ The licenses for most software are designed to take away your
+freedom to share and change it. By contrast, the GNU General Public
+License is intended to guarantee your freedom to share and change free
+software--to make sure the software is free for all its users. This
+General Public License applies to most of the Free Software
+Foundation's software and to any other program whose authors commit to
+using it. (Some other Free Software Foundation software is covered by
+the GNU Lesser General Public License instead.) You can apply it to
+your programs, too.
+
+ When we speak of free software, we are referring to freedom, not
+price. Our General Public Licenses are designed to make sure that you
+have the freedom to distribute copies of free software (and charge for
+this service if you wish), that you receive source code or can get it
+if you want it, that you can change the software or use pieces of it
+in new free programs; and that you know you can do these things.
+
+ To protect your rights, we need to make restrictions that forbid
+anyone to deny you these rights or to ask you to surrender the rights.
+These restrictions translate to certain responsibilities for you if you
+distribute copies of the software, or if you modify it.
+
+ For example, if you distribute copies of such a program, whether
+gratis or for a fee, you must give the recipients all the rights that
+you have. You must make sure that they, too, receive or can get the
+source code. And you must show them these terms so they know their
+rights.
+
+ We protect your rights with two steps: (1) copyright the software, and
+(2) offer you this license which gives you legal permission to copy,
+distribute and/or modify the software.
+
+ Also, for each author's protection and ours, we want to make certain
+that everyone understands that there is no warranty for this free
+software. If the software is modified by someone else and passed on, we
+want its recipients to know that what they have is not the original, so
+that any problems introduced by others will not reflect on the original
+authors' reputations.
+
+ Finally, any free program is threatened constantly by software
+patents. We wish to avoid the danger that redistributors of a free
+program will individually obtain patent licenses, in effect making the
+program proprietary. To prevent this, we have made it clear that any
+patent must be licensed for everyone's free use or not licensed at all.
+
+ The precise terms and conditions for copying, distribution and
+modification follow.
+
+ GNU GENERAL PUBLIC LICENSE
+ TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
+
+ 0. This License applies to any program or other work which contains
+a notice placed by the copyright holder saying it may be distributed
+under the terms of this General Public License. The "Program", below,
+refers to any such program or work, and a "work based on the Program"
+means either the Program or any derivative work under copyright law:
+that is to say, a work containing the Program or a portion of it,
+either verbatim or with modifications and/or translated into another
+language. (Hereinafter, translation is included without limitation in
+the term "modification".) Each licensee is addressed as "you".
+
+Activities other than copying, distribution and modification are not
+covered by this License; they are outside its scope. The act of
+running the Program is not restricted, and the output from the Program
+is covered only if its contents constitute a work based on the
+Program (independent of having been made by running the Program).
+Whether that is true depends on what the Program does.
+
+ 1. You may copy and distribute verbatim copies of the Program's
+source code as you receive it, in any medium, provided that you
+conspicuously and appropriately publish on each copy an appropriate
+copyright notice and disclaimer of warranty; keep intact all the
+notices that refer to this License and to the absence of any warranty;
+and give any other recipients of the Program a copy of this License
+along with the Program.
+
+You may charge a fee for the physical act of transferring a copy, and
+you may at your option offer warranty protection in exchange for a fee.
+
+ 2. You may modify your copy or copies of the Program or any portion
+of it, thus forming a work based on the Program, and copy and
+distribute such modifications or work under the terms of Section 1
+above, provided that you also meet all of these conditions:
+
+ a) You must cause the modified files to carry prominent notices
+ stating that you changed the files and the date of any change.
+
+ b) You must cause any work that you distribute or publish, that in
+ whole or in part contains or is derived from the Program or any
+ part thereof, to be licensed as a whole at no charge to all third
+ parties under the terms of this License.
+
+ c) If the modified program normally reads commands interactively
+ when run, you must cause it, when started running for such
+ interactive use in the most ordinary way, to print or display an
+ announcement including an appropriate copyright notice and a
+ notice that there is no warranty (or else, saying that you provide
+ a warranty) and that users may redistribute the program under
+ these conditions, and telling the user how to view a copy of this
+ License. (Exception: if the Program itself is interactive but
+ does not normally print such an announcement, your work based on
+ the Program is not required to print an announcement.)
+
+These requirements apply to the modified work as a whole. If
+identifiable sections of that work are not derived from the Program,
+and can be reasonably considered independent and separate works in
+themselves, then this License, and its terms, do not apply to those
+sections when you distribute them as separate works. But when you
+distribute the same sections as part of a whole which is a work based
+on the Program, the distribution of the whole must be on the terms of
+this License, whose permissions for other licensees extend to the
+entire whole, and thus to each and every part regardless of who wrote it.
+
+Thus, it is not the intent of this section to claim rights or contest
+your rights to work written entirely by you; rather, the intent is to
+exercise the right to control the distribution of derivative or
+collective works based on the Program.
+
+In addition, mere aggregation of another work not based on the Program
+with the Program (or with a work based on the Program) on a volume of
+a storage or distribution medium does not bring the other work under
+the scope of this License.
+
+ 3. You may copy and distribute the Program (or a work based on it,
+under Section 2) in object code or executable form under the terms of
+Sections 1 and 2 above provided that you also do one of the following:
+
+ a) Accompany it with the complete corresponding machine-readable
+ source code, which must be distributed under the terms of Sections
+ 1 and 2 above on a medium customarily used for software interchange; or,
+
+ b) Accompany it with a written offer, valid for at least three
+ years, to give any third party, for a charge no more than your
+ cost of physically performing source distribution, a complete
+ machine-readable copy of the corresponding source code, to be
+ distributed under the terms of Sections 1 and 2 above on a medium
+ customarily used for software interchange; or,
+
+ c) Accompany it with the information you received as to the offer
+ to distribute corresponding source code. (This alternative is
+ allowed only for noncommercial distribution and only if you
+ received the program in object code or executable form with such
+ an offer, in accord with Subsection b above.)
+
+The source code for a work means the preferred form of the work for
+making modifications to it. For an executable work, complete source
+code means all the source code for all modules it contains, plus any
+associated interface definition files, plus the scripts used to
+control compilation and installation of the executable. However, as a
+special exception, the source code distributed need not include
+anything that is normally distributed (in either source or binary
+form) with the major components (compiler, kernel, and so on) of the
+operating system on which the executable runs, unless that component
+itself accompanies the executable.
+
+If distribution of executable or object code is made by offering
+access to copy from a designated place, then offering equivalent
+access to copy the source code from the same place counts as
+distribution of the source code, even though third parties are not
+compelled to copy the source along with the object code.
+
+ 4. You may not copy, modify, sublicense, or distribute the Program
+except as expressly provided under this License. Any attempt
+otherwise to copy, modify, sublicense or distribute the Program is
+void, and will automatically terminate your rights under this License.
+However, parties who have received copies, or rights, from you under
+this License will not have their licenses terminated so long as such
+parties remain in full compliance.
+
+ 5. You are not required to accept this License, since you have not
+signed it. However, nothing else grants you permission to modify or
+distribute the Program or its derivative works. These actions are
+prohibited by law if you do not accept this License. Therefore, by
+modifying or distributing the Program (or any work based on the
+Program), you indicate your acceptance of this License to do so, and
+all its terms and conditions for copying, distributing or modifying
+the Program or works based on it.
+
+ 6. Each time you redistribute the Program (or any work based on the
+Program), the recipient automatically receives a license from the
+original licensor to copy, distribute or modify the Program subject to
+these terms and conditions. You may not impose any further
+restrictions on the recipients' exercise of the rights granted herein.
+You are not responsible for enforcing compliance by third parties to
+this License.
+
+ 7. If, as a consequence of a court judgment or allegation of patent
+infringement or for any other reason (not limited to patent issues),
+conditions are imposed on you (whether by court order, agreement or
+otherwise) that contradict the conditions of this License, they do not
+excuse you from the conditions of this License. If you cannot
+distribute so as to satisfy simultaneously your obligations under this
+License and any other pertinent obligations, then as a consequence you
+may not distribute the Program at all. For example, if a patent
+license would not permit royalty-free redistribution of the Program by
+all those who receive copies directly or indirectly through you, then
+the only way you could satisfy both it and this License would be to
+refrain entirely from distribution of the Program.
+
+If any portion of this section is held invalid or unenforceable under
+any particular circumstance, the balance of the section is intended to
+apply and the section as a whole is intended to apply in other
+circumstances.
+
+It is not the purpose of this section to induce you to infringe any
+patents or other property right claims or to contest validity of any
+such claims; this section has the sole purpose of protecting the
+integrity of the free software distribution system, which is
+implemented by public license practices. Many people have made
+generous contributions to the wide range of software distributed
+through that system in reliance on consistent application of that
+system; it is up to the author/donor to decide if he or she is willing
+to distribute software through any other system and a licensee cannot
+impose that choice.
+
+This section is intended to make thoroughly clear what is believed to
+be a consequence of the rest of this License.
+
+ 8. If the distribution and/or use of the Program is restricted in
+certain countries either by patents or by copyrighted interfaces, the
+original copyright holder who places the Program under this License
+may add an explicit geographical distribution limitation excluding
+those countries, so that distribution is permitted only in or among
+countries not thus excluded. In such case, this License incorporates
+the limitation as if written in the body of this License.
+
+ 9. The Free Software Foundation may publish revised and/or new versions
+of the General Public License from time to time. Such new versions will
+be similar in spirit to the present version, but may differ in detail to
+address new problems or concerns.
+
+Each version is given a distinguishing version number. If the Program
+specifies a version number of this License which applies to it and "any
+later version", you have the option of following the terms and conditions
+either of that version or of any later version published by the Free
+Software Foundation. If the Program does not specify a version number of
+this License, you may choose any version ever published by the Free Software
+Foundation.
+
+ 10. If you wish to incorporate parts of the Program into other free
+programs whose distribution conditions are different, write to the author
+to ask for permission. For software which is copyrighted by the Free
+Software Foundation, write to the Free Software Foundation; we sometimes
+make exceptions for this. Our decision will be guided by the two goals
+of preserving the free status of all derivatives of our free software and
+of promoting the sharing and reuse of software generally.
+
+ NO WARRANTY
+
+ 11. BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY
+FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE LAW. EXCEPT WHEN
+OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES
+PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED
+OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE ENTIRE RISK AS
+TO THE QUALITY AND PERFORMANCE OF THE PROGRAM IS WITH YOU. SHOULD THE
+PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING,
+REPAIR OR CORRECTION.
+
+ 12. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR
+REDISTRIBUTE THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES,
+INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING
+OUT OF THE USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED
+TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY
+YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER
+PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGES.
+
+ END OF TERMS AND CONDITIONS
+
+ How to Apply These Terms to Your New Programs
+
+ If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+ To do so, attach the following notices to the program. It is safest
+to attach them to the start of each source file to most effectively
+convey the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+ <one line to give the program's name and a brief idea of what it does.>
+ Copyright (C) <year> <name of author>
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 2 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License along
+ with this program; if not, write to the Free Software Foundation, Inc.,
+ 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+
+Also add information on how to contact you by electronic and paper mail.
+
+If the program is interactive, make it output a short notice like this
+when it starts in an interactive mode:
+
+ Gnomovision version 69, Copyright (C) year name of author
+ Gnomovision comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+ This is free software, and you are welcome to redistribute it
+ under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License. Of course, the commands you use may
+be called something other than `show w' and `show c'; they could even be
+mouse-clicks or menu items--whatever suits your program.
+
+You should also get your employer (if you work as a programmer) or your
+school, if any, to sign a "copyright disclaimer" for the program, if
+necessary. Here is a sample; alter the names:
+
+ Yoyodyne, Inc., hereby disclaims all copyright interest in the program
+ `Gnomovision' (which makes passes at compilers) written by James Hacker.
+
+ <signature of Ty Coon>, 1 April 1989
+ Ty Coon, President of Vice
+
+This General Public License does not permit incorporating your program into
+proprietary programs. If your program is a subroutine library, you may
+consider it more useful to permit linking proprietary applications with the
+library. If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.
diff --git a/wsrep-lib/wsrep-API/v26/README.md b/wsrep-lib/wsrep-API/v26/README.md
new file mode 100644
index 00000000..27664805
--- /dev/null
+++ b/wsrep-lib/wsrep-API/v26/README.md
@@ -0,0 +1,7 @@
+# Write Set Replication API specification
+
+Building:
+```
+cmake [-DCMAKE_BUILD_TYPE=Debug|Release] . && make [VERBOSE=1]
+```
+in top directory.
diff --git a/wsrep-lib/wsrep-API/v26/examples/CMakeLists.txt b/wsrep-lib/wsrep-API/v26/examples/CMakeLists.txt
new file mode 100644
index 00000000..e6e33b78
--- /dev/null
+++ b/wsrep-lib/wsrep-API/v26/examples/CMakeLists.txt
@@ -0,0 +1,19 @@
+# Copyright (c) 2019, Codership Oy. All rights reserved.
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; version 2 of the License.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+
+ADD_EXECUTABLE(listener listener.c)
+TARGET_LINK_LIBRARIES(listener wsrep dl pthread)
+
+ADD_SUBDIRECTORY(node)
diff --git a/wsrep-lib/wsrep-API/v26/examples/README.md b/wsrep-lib/wsrep-API/v26/examples/README.md
new file mode 100644
index 00000000..b1b20744
--- /dev/null
+++ b/wsrep-lib/wsrep-API/v26/examples/README.md
@@ -0,0 +1,14 @@
+## wsrep API usage examples
+
+### 1. Listener
+Is a simple program that connects and listens to replication events in
+an existing cluster.
+
+Usage example (starting listener on the same host as the rest of the cluster):
+```
+$ ./listener /path_to/libgalera_smm.so gcomm://localhost:4567?gmcast.listen_addr=tcp://127.0.0.1:9999 cluster_name
+```
+
+### 2. Node
+Is a more complex program which implements most of wsrep node functionality
+and can form clusters in itself.
diff --git a/wsrep-lib/wsrep-API/v26/examples/listener.c b/wsrep-lib/wsrep-API/v26/examples/listener.c
new file mode 100644
index 00000000..9fc881fe
--- /dev/null
+++ b/wsrep-lib/wsrep-API/v26/examples/listener.c
@@ -0,0 +1,268 @@
+/* Copyright (C) 2012 Codership Oy <info@codersihp.com>
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; version 2 of the License.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program; if not, write to the Free Software
+ Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+/*! @file Example of wsrep event listener. Outputs description of received
+ * events to stdout. To get a general picture you should start with
+ * main() function. */
+
+#include <wsrep_api.h>
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <errno.h>
+#include <signal.h>
+#include <pthread.h>
+
+/*! This is global application context, it will be used by wsrep callbacks */
+struct application_context
+{};
+
+static struct application_context global_ctx;
+
+/*! This is receiving thread context, it will be used by wsrep callbacks */
+struct receiver_context
+{
+ char msg[4096];
+};
+
+/* wsrep provider handle (global for simplicty) */
+static wsrep_t* wsrep = NULL;
+
+/*! This is a logger callback which library will be using to log events. */
+static void
+logger_cb (wsrep_log_level_t level __attribute__((unused)), const char* msg)
+{
+ fprintf (stderr, "WSREP: %s\n", msg);
+}
+
+/*! This will be called on cluster view change (nodes joining, leaving, etc.).
+ * Each view change is the point where application may be pronounced out of
+ * sync with the current cluster view and need state transfer.
+ * It is guaranteed that no other callbacks are called concurrently with it. */
+static wsrep_cb_status_t
+view_cb (void* app_ctx __attribute__((unused)),
+ void* recv_ctx __attribute__((unused)),
+ const wsrep_view_info_t* view,
+ const char* state __attribute__((unused)),
+ size_t state_len __attribute__((unused)))
+{
+ printf ("New cluster membership view: %d nodes, my index is %d, "
+ "global seqno: %lld\n",
+ view->memb_num, view->my_idx, (long long)view->state_id.seqno);
+
+ return WSREP_CB_SUCCESS;
+}
+
+/*! This will be called on cluster view change (nodes joining, leaving, etc.).
+ * Each view change is the point where application may be pronounced out of
+ * sync with the current cluster view and need state transfer.
+ * It is guaranteed that no other callbacks are called concurrently with it. */
+static wsrep_cb_status_t
+sst_request_cb (void* app_ctx __attribute__((unused)),
+ void** sst_req,
+ size_t* sst_req_len)
+{
+ /* For simplicity we're skipping state transfer by using magic string
+ * as a state transfer request.
+ * This node will not be considered JOINED (having full state)
+ * by other cluster members. */
+ *sst_req = strdup(WSREP_STATE_TRANSFER_NONE);
+
+ if (*sst_req)
+ *sst_req_len = strlen(*sst_req) + 1;
+ else
+ *sst_req_len = 0;
+
+ return WSREP_CB_SUCCESS;
+}
+
+/*! This is called to "apply" writeset.
+ * If writesets don't conflict on keys, it may be called concurrently to
+ * utilize several CPU cores. */
+static wsrep_cb_status_t
+apply_cb (void* recv_ctx,
+ const wsrep_ws_handle_t* ws_handle __attribute__((unused)),
+ uint32_t flags __attribute__((unused)),
+ const wsrep_buf_t* ws __attribute__((unused)),
+ const wsrep_trx_meta_t* meta,
+ wsrep_bool_t* exit_loop __attribute__((unused)))
+{
+ struct receiver_context* ctx = (struct receiver_context*)recv_ctx;
+
+ snprintf (ctx->msg, sizeof(ctx->msg),
+ "Got writeset %lld, size %zu", (long long)meta->gtid.seqno,
+ ws->len);
+
+ bool const commit = flags & (WSREP_FLAG_TRX_END | WSREP_FLAG_ROLLBACK);
+
+ wsrep->commit_order_enter(wsrep, ws_handle, meta);
+ if (commit) puts(ctx->msg);
+ wsrep->commit_order_leave(wsrep, ws_handle, meta, NULL);
+
+ return WSREP_CB_SUCCESS;
+}
+
+/* The following callbacks are stubs and not used in this example. */
+static wsrep_cb_status_t
+unordered_cb(void* recv_ctx __attribute__((unused)),
+ const wsrep_buf_t* data __attribute__((unused)))
+{
+ return WSREP_CB_SUCCESS;
+}
+
+static wsrep_cb_status_t
+sst_donate_cb (void* app_ctx __attribute__((unused)),
+ void* recv_ctx __attribute__((unused)),
+ const wsrep_buf_t* msg __attribute__((unused)),
+ const wsrep_gtid_t* state_id __attribute__((unused)),
+ const wsrep_buf_t* state __attribute__((unused)),
+ wsrep_bool_t bypass __attribute__((unused)))
+{
+ return WSREP_CB_SUCCESS;
+}
+
+static wsrep_cb_status_t synced_cb (void* app_ctx __attribute__((unused)))
+{
+ return WSREP_CB_SUCCESS;
+}
+
+/* This is the listening thread. It blocks in wsrep::recv() call until
+ * disconnect from cluster. It will apply and commit writesets through the
+ * callbacks defined avbove. */
+static void*
+recv_thread (void* arg)
+{
+ struct receiver_context* ctx = (struct receiver_context*)arg;
+
+ wsrep_status_t rc = wsrep->recv(wsrep, ctx);
+
+ fprintf (stderr, "Receiver exited with code %d", rc);
+
+ return NULL;
+}
+
+/* This is a signal handler to demonstrate graceful cluster leave. */
+static void
+graceful_leave (int signum)
+{
+ printf ("Got signal %d, exiting...\n", signum);
+ wsrep->disconnect(wsrep);
+}
+
+int main (int const argc, char* argv[])
+{
+ if (argc < 4 || argc > 5)
+ {
+ fprintf (stderr, "Usage: %s </path/to/wsrep/provider> <wsrep URI> "
+ "<cluster name> [own address]\n", argv[0]);
+ exit (EXIT_FAILURE);
+ }
+
+ const char* const wsrep_provider = argv[1];
+ const char* const wsrep_uri = argv[2];
+ const char* const cluster_name = argv[3];
+ const char* const own_address = argc == 5 ? argv[4] : "localhost";
+
+ /* Now let's load and initialize provider */
+ wsrep_status_t rc = wsrep_load (wsrep_provider, &wsrep, logger_cb);
+ if (WSREP_OK != rc)
+ {
+ fprintf (stderr, "Failed to load wsrep provider '%s'\n",wsrep_provider);
+ exit (EXIT_FAILURE);
+ }
+
+ wsrep_gtid_t state_id = { WSREP_UUID_UNDEFINED, WSREP_SEQNO_UNDEFINED };
+
+ /* wsrep provider initialization arguments */
+ struct wsrep_init_args wsrep_args =
+ {
+ .app_ctx = &global_ctx,
+
+ .node_name = "example listener",
+ .node_address = own_address,
+ .node_incoming = "",
+ .data_dir = ".", // working directory
+ .options = "",
+ .proto_ver = 127, // maximum supported application event protocol
+
+ .state_id = &state_id,
+ .state = NULL,
+
+ .logger_cb = logger_cb,
+ .view_cb = view_cb,
+ .sst_request_cb = sst_request_cb,
+ .encrypt_cb = NULL,
+ .apply_cb = apply_cb,
+ .unordered_cb = unordered_cb,
+ .sst_donate_cb = sst_donate_cb,
+ .synced_cb = synced_cb
+ };
+
+ rc = wsrep->init(wsrep, &wsrep_args);
+ if (WSREP_OK != rc)
+ {
+ fprintf (stderr, "wsrep::init() failed: %d\n", rc);
+ exit (EXIT_FAILURE);
+ }
+
+ /* Connect to cluster */
+ rc = wsrep->connect(wsrep, cluster_name, wsrep_uri, "", 0);
+ if (0 != rc)
+ {
+ if (rc < 0)
+ fprintf (stderr, "wsrep::connect(%s, %s) failed: %d (%s)\n",
+ cluster_name, wsrep_uri, rc, strerror(-(int)rc));
+ else
+ fprintf (stderr, "wsrep::connect() failed: %d\n", rc);
+
+ exit (EXIT_FAILURE);
+ }
+
+ /* Now let's start several listening threads*/
+ int const num_threads = 4;
+ struct receiver_context thread_ctx[num_threads];
+ pthread_t threads[num_threads];
+
+ int i;
+ for (i = 0; i < num_threads; i++)
+ {
+ int err = pthread_create (
+ &threads[i], NULL, recv_thread, &thread_ctx[i]);
+
+ if (err)
+ {
+ fprintf (stderr, "Failed to start thread %d: %d (%s)",
+ i, err, strerror(err));
+ exit (EXIT_FAILURE);
+ }
+ }
+
+ signal (SIGTERM, graceful_leave);
+ signal (SIGINT, graceful_leave);
+
+ /* Listening threads are now running and receiving writesets. Wait for them
+ * to join. Threads will join after signal handler closes wsrep connection*/
+ for (i = 0; i < num_threads; i++)
+ {
+ pthread_join (threads[i], NULL);
+ }
+
+ /* Unload provider after nobody uses it any more. */
+ wsrep_unload (wsrep);
+
+ return 0;
+}
diff --git a/wsrep-lib/wsrep-API/v26/examples/node/CMakeLists.txt b/wsrep-lib/wsrep-API/v26/examples/node/CMakeLists.txt
new file mode 100644
index 00000000..d018afde
--- /dev/null
+++ b/wsrep-lib/wsrep-API/v26/examples/node/CMakeLists.txt
@@ -0,0 +1,26 @@
+# Copyright (c) 2019, Codership Oy. All rights reserved.
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; version 2 of the License.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+
+FILE(GLOB SRC
+ "*.h"
+ "*.c"
+ )
+
+ADD_EXECUTABLE(node ${SRC})
+
+TARGET_LINK_LIBRARIES(node wsrep dl pthread)
+
+CONFIGURE_FILE(${CMAKE_CURRENT_SOURCE_DIR}/node.sh
+ ${CMAKE_CURRENT_BINARY_DIR}/node.sh COPYONLY)
diff --git a/wsrep-lib/wsrep-API/v26/examples/node/README.md b/wsrep-lib/wsrep-API/v26/examples/node/README.md
new file mode 100644
index 00000000..4a07c149
--- /dev/null
+++ b/wsrep-lib/wsrep-API/v26/examples/node/README.md
@@ -0,0 +1,81 @@
+# wsrep API node application
+
+## Overview
+
+This is a simple application to demonstrate the usage of wsrep API. It
+deliberately does nothing useful in order to present as concentrated and
+concise API usage as possible.
+
+The program is deliberately written in C to demonstrate the naked API usage.
+For C++ example see a much more advanced integration library at
+https://github.com/codership/wsrep-lib
+
+## High level architecture
+
+Process-wise the program consists of an endless main loop that periodically
+samples and prints performance stats and a configurable number of "master" and
+"slave" threads, with master threads loop executing "transactions" and
+replicating resulting "write sets" and slave threads receiving and processing
+the write sets from other nodes.
+
+Object-wise the program is composed of two main objects: `store` and `wsrep`.
+'store' object contains application "state" and generates and commits changes
+to the state. `wsrep` object contains cluster context and provides interface
+to it. Changes generated by `store` are replicated and certified through
+`wsrep` and then committed to `store`.
+
+## Unit descriptions (in alphabetical order)
+
+#### ctx.h
+A small header to declare the application context structure.
+
+#### log.*
+Implements logging functionality for the application AND
+**a logging callback** for the wsrep provider.
+
+#### main.c
+Defines `main()` routine that initializes storage and wsrep provider, starts
+the worker threads and loops in a statistics collection loop. Even though it is
+not designed to return it still shows the deinitialization order.
+
+#### options.*
+Implements reading configuration options from the command line, does not have
+anything related to wsrep API, but shows which additional parameters must be
+configured for the program to make use of wsrep clustering.
+
+#### socket.*
+Network sockets boilerplate code for setting TCP connections between processes
+(for SST). Has nothing wsrep-related and can be ignored.
+
+#### sst.*
+Defines **SST callbacks** for the wsrep provider and shows how to asynchronously
+implement state snapshot transfer (yes, you don't want to spend eternity in
+callbacks).
+
+#### stats.*
+Implements performance stats collecting function for the main loop. While it is
+an absolutely optional provider functionality, still it shows how to use that.
+
+#### store.*
+Defines the `store` object that pretends to store and modify some data in a
+"transactional" manner. It provides the caller that intends to do a change with
+a *change data* and a *key* for replication and certification.
+
+#### trx.*
+Defines routines to process local and replicated transactions.
+
+#### worker.*
+Implements worker thread pool functinality. Worker threads run routines defined
+in 'trx.*'. Also implements **apply callback** for the wsrep provider.
+
+#### wsrep.*
+Maintains wsrep cluster context: provider instance and cluster membership view.
+While there is little use for the latter in this primitive application, still
+it shows **connected and view callbacks** usage. But mostly, for this
+application its purpose is to initialize the provider, connect to the cluster
+and offer access to initialized provider for other parts of the program.
+
+## Example usage
+```
+./node -f /tmp/galera/0 -v /tmp/galera/0/galera/lib/libgalera_smm.so -o 'pc.weight=2;evs.send_window=2;evs.user_send_window=1;gcache.recover=no' -s 8 -m 16
+```
diff --git a/wsrep-lib/wsrep-API/v26/examples/node/ctx.h b/wsrep-lib/wsrep-API/v26/examples/node/ctx.h
new file mode 100644
index 00000000..01653554
--- /dev/null
+++ b/wsrep-lib/wsrep-API/v26/examples/node/ctx.h
@@ -0,0 +1,34 @@
+/* Copyright (c) 2019, Codership Oy. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/**
+ * @file This unit defines application context for wsrep provider
+ */
+
+#ifndef NODE_CTX_H
+#define NODE_CTX_H
+
+#include "store.h"
+#include "wsrep.h"
+
+struct node_ctx
+{
+ node_wsrep_t* wsrep;
+ node_store_t* store;
+ const struct node_options* opts;
+};
+
+#endif /* NODE_CTX_H */
diff --git a/wsrep-lib/wsrep-API/v26/examples/node/log.c b/wsrep-lib/wsrep-API/v26/examples/node/log.c
new file mode 100644
index 00000000..71f4705c
--- /dev/null
+++ b/wsrep-lib/wsrep-API/v26/examples/node/log.c
@@ -0,0 +1,100 @@
+/* Copyright (c) 2019, Codership Oy. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include "log.h"
+
+#include <stdio.h> // fprintf(), fflush()
+#include <sys/time.h> // gettimeofday()
+#include <time.h> // localtime_r()
+#include <stdarg.h> // va_start(), va_end()
+
+wsrep_log_level_t node_log_max_level = WSREP_LOG_INFO;
+
+static const char* log_level_str[WSREP_LOG_DEBUG + 2] =
+{
+ "FATAL: ",
+ "ERROR: ",
+ " WARN: ",
+ " INFO: ",
+ "DEBUG: ",
+ "XXXXX: "
+};
+
+static inline void
+log_timestamp_and_log(const char* const prefix, // source of msg
+ int const severity,
+ const char* const msg)
+{
+ struct tm date;
+ struct timeval time;
+
+ gettimeofday(&time, NULL);
+ localtime_r (&time.tv_sec, &date);
+
+ FILE* log_file = stderr;
+ fprintf(log_file,
+ "%04d-%02d-%02d %02d:%02d:%02d.%03d " /* timestamp fmt */
+ "[%s] %s%s\n", /* [prefix] severity msg */
+ date.tm_year + 1900, date.tm_mon + 1, date.tm_mday,
+ date.tm_hour, date.tm_min, date.tm_sec,
+ (int)time.tv_usec / 1000,
+ prefix, log_level_str[severity], msg
+ );
+
+ fflush (log_file);
+}
+
+void
+node_log_cb(wsrep_log_level_t const severity, const char* const msg)
+{
+ /* REPLICATION: let provider log messages be prefixed with 'wsrep'*/
+ log_timestamp_and_log("wsrep", severity, msg);
+}
+
+void
+node_log(wsrep_log_level_t const severity,
+ const char* const file,
+ const char* const function,
+ int const line,
+ ...)
+{
+ va_list ap;
+
+ char string[2048];
+ int max_string = sizeof(string);
+ char* str = string;
+
+ /* provide file:func():line info only if debug logging is on */
+ if (NODE_DO_LOG_DEBUG) {
+ int const len = snprintf(str, (size_t)max_string, "%s:%s():%d: ",
+ file, function, line);
+ str += len;
+ max_string -= len;
+ }
+
+ va_start(ap, line);
+ {
+ const char* format = va_arg (ap, const char*);
+
+ if (max_string > 0 && NULL != format) {
+ vsnprintf (str, (size_t)max_string, format, ap);
+ }
+ }
+ va_end(ap);
+
+ /* actual logging */
+ log_timestamp_and_log(" node", severity, string);
+}
diff --git a/wsrep-lib/wsrep-API/v26/examples/node/log.h b/wsrep-lib/wsrep-API/v26/examples/node/log.h
new file mode 100644
index 00000000..09404f26
--- /dev/null
+++ b/wsrep-lib/wsrep-API/v26/examples/node/log.h
@@ -0,0 +1,69 @@
+/* Copyright (c) 2019, Codership Oy. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/**
+ * @file This unit defines logging macros for the application and
+ * a logger callback for the wsrep provider.
+ */
+
+#ifndef NODE_LOG_H
+#define NODE_LOG_H
+
+#include "../../wsrep_api.h"
+
+/**
+ * REPLICATION: a logger callback for wsrep provider
+ */
+extern void
+node_log_cb(wsrep_log_level_t severity, const char* message);
+
+/**
+ * Applicaton log function intended to be used through the macros defined below.
+ * For simplicity it uses log levels defined by wsrep API, but it does not have
+ * to. */
+extern void
+node_log (wsrep_log_level_t level,
+ const char* file,
+ const char* function,
+ const int line,
+ ...);
+
+/**
+ * This variable made global to avoid calling node_log() when debug logging
+ * is disabled. */
+extern wsrep_log_level_t node_log_max_level;
+#define NODE_DO_LOG_DEBUG (WSREP_LOG_DEBUG <= node_log_max_level)
+
+/**
+ * Base logging macro that records current file, function and line number */
+#define NODE_LOG(level, ...)\
+ node_log(level, __FILE__, __func__, __LINE__, __VA_ARGS__, NULL)
+
+/**
+ * @name Logging macros.
+ * Must be implemented as macros to report the location of the code where
+ * they are called.
+ */
+/*@{*/
+#define NODE_FATAL(...) NODE_LOG(WSREP_LOG_FATAL, __VA_ARGS__, NULL)
+#define NODE_ERROR(...) NODE_LOG(WSREP_LOG_ERROR, __VA_ARGS__, NULL)
+#define NODE_WARN(...) NODE_LOG(WSREP_LOG_WARN, __VA_ARGS__, NULL)
+#define NODE_INFO(...) NODE_LOG(WSREP_LOG_INFO, __VA_ARGS__, NULL)
+#define NODE_DEBUG(...) if (NODE_DO_LOG_DEBUG) \
+ { NODE_LOG(WSREP_LOG_DEBUG, __VA_ARGS__, NULL); }
+/*@}*/
+
+#endif /* NODE_LOG_H */
diff --git a/wsrep-lib/wsrep-API/v26/examples/node/main.c b/wsrep-lib/wsrep-API/v26/examples/node/main.c
new file mode 100644
index 00000000..f3124042
--- /dev/null
+++ b/wsrep-lib/wsrep-API/v26/examples/node/main.c
@@ -0,0 +1,146 @@
+/* Copyright (c) 2019, Codership Oy. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include "ctx.h"
+#include "log.h"
+#include "options.h"
+#include "stats.h"
+#include "worker.h"
+#include "wsrep.h"
+
+#include <errno.h>
+#include <signal.h> // sigaction()
+#include <string.h> // strerror()
+
+static void
+signal_handler(int const signum)
+{
+ NODE_INFO("Got signal %d. Terminating.", signum);
+}
+
+static void
+install_signal_handler(void)
+{
+ sigset_t sa_mask;
+ sigemptyset(&sa_mask);
+
+ struct sigaction const act =
+ {
+ .sa_handler = signal_handler,
+ .sa_mask = sa_mask,
+ .sa_flags = (int)SA_RESETHAND
+ };
+
+ if (sigaction(SIGINT /* Ctrl-C */, &act, NULL))
+ {
+ NODE_INFO("sigaction() failed: %d (%s)", errno, strerror(errno));
+ abort();
+ }
+}
+
+int main(int argc, char* argv[])
+{
+ install_signal_handler();
+
+ struct node_options opts;
+ int err = node_options_read(argc, argv, &opts);
+ if (err)
+ {
+ NODE_FATAL("Failed to read command line opritons: %d (%s)",
+ err, strerror(err));
+ return err;
+ }
+
+ struct node_ctx node;
+ node.opts = &opts;
+
+ /* REPLICATION: before connecting to cluster we need to initialize our
+ * storage to know our current position (GTID) */
+ node.store = node_store_open(&opts);
+ if (!node.store)
+ {
+ NODE_FATAL("Failed to open node store");
+ return 1;
+ }
+
+ wsrep_gtid_t current_gtid;
+ node_store_gtid(node.store, &current_gtid);
+
+ /* REPLICATION: complete initialization of application context
+ * (including provider itself) */
+ node.wsrep = node_wsrep_init(&opts, &current_gtid, &node);
+ if (!node.wsrep)
+ {
+ NODE_FATAL("Failed to initialize wsrep provider");
+ return 1;
+ }
+
+ /* REPLICATION: now we can connect to the cluster and start receiving
+ * replication events */
+ if (node_wsrep_connect(node.wsrep, opts.address, opts.bootstrap) !=
+ WSREP_OK)
+ {
+ NODE_FATAL("Failed to connect to primary component");
+ return 1;
+ }
+
+ /* REPLICATION: and start processing replicaiton events */
+ struct node_worker_pool* slave_pool =
+ node_worker_start(&node, NODE_WORKER_SLAVE, (size_t)opts.slaves);
+ if (!slave_pool)
+ {
+ NODE_FATAL("Failed to create slave worker pool");
+ return 1;
+ }
+
+ /* REPLICATION: now that replicaton events are being processed we can
+ * wait to sync with the cluster */
+ if (!node_wsrep_wait_synced(node.wsrep))
+ {
+ NODE_ERROR("Failed to wait fir SYNCED event");
+ return 1;
+ }
+
+ NODE_INFO("Synced with cluster");
+
+ /* REPLICATION: now we can start replicate own events */
+ struct node_worker_pool* master_pool =
+ node_worker_start(&node, NODE_WORKER_MASTER, (size_t)opts.masters);
+ if (opts.masters > 0 && !master_pool)
+ {
+ NODE_FATAL("Failed to create master worker pool");
+ return 1;
+ }
+
+ node_stats_loop(&node, (int)opts.period);
+
+ /* REPLICATON: to shut down we go in the opposite order:
+ * first - disconnect from the cluster to signal master threads
+ * to exit loop,
+ * second - join master and slave threads,
+ * third - close provider once not in use */
+ node_wsrep_disconnect(node.wsrep);
+
+ node_worker_stop(master_pool);
+ node_worker_stop(slave_pool);
+
+ node_wsrep_close(node.wsrep);
+
+ /* and finally, when the storage can no longer be disturbed, close it */
+ node_store_close(node.store);
+
+ return 0;
+}
diff --git a/wsrep-lib/wsrep-API/v26/examples/node/node.sh b/wsrep-lib/wsrep-API/v26/examples/node/node.sh
new file mode 100755
index 00000000..40e0a498
--- /dev/null
+++ b/wsrep-lib/wsrep-API/v26/examples/node/node.sh
@@ -0,0 +1,40 @@
+#!/bin/sh -eu
+
+NODE_ID=$1
+
+NODE_NAME=${NODE_NAME:-$NODE_ID}
+
+NODE_DIR=${NODE_DIR:-/tmp/node/$NODE_NAME}
+rm -rf $NODE_DIR/*
+mkdir -p $NODE_DIR
+
+NODE_OPT=${NODE_OPT:-}
+
+NODE_HOST=${NODE_HOST:-localhost}
+NODE_PORT=${NODE_PORT:-$((10000 + $NODE_ID))}
+
+NODE_CLIENTS=${NODE_CLIENTS:-1}
+NODE_APPLIERS=${NODE_APPLIERS:-1}
+
+NODE_ADDR=${NODE_ADDR:-}
+
+NODE_BIN=${NODE_BIN:-$(dirname $0)/node}
+
+# convert possible relative path to absolute path
+NODE_PROVIDER=$(realpath $NODE_PROVIDER)
+
+set -x
+
+$NODE_BIN \
+-v "$NODE_PROVIDER" \
+-n "$NODE_NAME" \
+-f "$NODE_DIR" \
+-o "$NODE_OPT" \
+-t "$NODE_HOST" \
+-p $NODE_PORT \
+-s $NODE_APPLIERS \
+-m $NODE_CLIENTS \
+-d 10 \
+-a "$NODE_ADDR"
+
+set +x
diff --git a/wsrep-lib/wsrep-API/v26/examples/node/options.c b/wsrep-lib/wsrep-API/v26/examples/node/options.c
new file mode 100644
index 00000000..0bd08ffb
--- /dev/null
+++ b/wsrep-lib/wsrep-API/v26/examples/node/options.c
@@ -0,0 +1,291 @@
+/* Copyright (c) 2019-2020, Codership Oy. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include "options.h"
+
+#include <ctype.h> // isspace()
+#include <errno.h>
+#include <getopt.h>
+#include <stdio.h>
+#include <stdlib.h> // strtol()
+#include <string.h> // strcmp()
+
+/*
+ * getopt_long() declarations begin
+ */
+
+#define OPTS_NA no_argument
+#define OPTS_RA required_argument
+#define OPTS_OA optional_argument
+
+typedef enum opt
+{
+ OPTS_NOOPT = 0,
+ OPTS_ADDRESS = 'a',
+ OPTS_BOOTSTRAP = 'b',
+ OPTS_DELAY = 'd',
+ OPTS_DATA_DIR = 'f',
+ OPTS_HELP = 'h',
+ OPTS_PERIOD = 'i',
+ OPTS_MASTERS = 'm',
+ OPTS_NAME = 'n',
+ OPTS_OPTIONS = 'o',
+ OPTS_BASE_PORT = 'p',
+ OPTS_RECORDS = 'r',
+ OPTS_SLAVES = 's',
+ OPTS_BASE_HOST = 't',
+ OPTS_PROVIDER = 'v',
+ OPTS_WS_SIZE = 'w',
+ OPTS_OPS = 'x'
+}
+ opt_t;
+
+static struct option s_opts[] =
+{
+ { "address", OPTS_RA, NULL, OPTS_ADDRESS },
+ { "bootstrap", OPTS_NA, NULL, OPTS_BOOTSTRAP },
+ { "delay", OPTS_RA, NULL, OPTS_DELAY },
+ { "storage", OPTS_RA, NULL, OPTS_DATA_DIR },
+ { "help", OPTS_NA, NULL, OPTS_HELP },
+ { "period", OPTS_RA, NULL, OPTS_PERIOD },
+ { "masters", OPTS_RA, NULL, OPTS_MASTERS },
+ { "name", OPTS_RA, NULL, OPTS_NAME },
+ { "options", OPTS_RA, NULL, OPTS_OPTIONS, },
+ { "base-port", OPTS_RA, NULL, OPTS_BASE_PORT },
+ { "records", OPTS_RA, NULL, OPTS_RECORDS },
+ { "slaves", OPTS_RA, NULL, OPTS_SLAVES },
+ { "base-host", OPTS_RA, NULL, OPTS_BASE_HOST },
+ { "provider", OPTS_RA, NULL, OPTS_PROVIDER },
+ { "size", OPTS_RA, NULL, OPTS_WS_SIZE },
+ { "ops", OPTS_RA, NULL, OPTS_OPS },
+ { NULL, 0, NULL, 0 }
+};
+
+static const char* opts_string = "a:d:f:hi:m:n:o:p:r:s:t:v:w:x:";
+
+/*
+ * getopt_long() declarations end
+ */
+
+static const struct node_options opts_defaults =
+{
+ .provider = "none",
+ .address = "",
+ .options = "",
+ .name = "unnamed",
+ .data_dir = ".",
+ .base_host = "localhost",
+ .masters = 0,
+ .slaves = 1,
+ .ws_size = 1024,
+ .records = 1024*1024,
+ .delay = 0,
+ .base_port = 4567,
+ .period = 10,
+ .operations= 1,
+ .bootstrap = true
+};
+
+static void
+opts_print_help(FILE* out, const char* prog_name)
+{
+ fprintf(
+ out,
+ "Usage: %s [OPTION...]\n"
+ "\n"
+ " -h, --help this thing.\n"
+ " -v, --provider=PATH a path to wsrep provider library file.\n"
+ " -a, --address=STRING list of node addresses in the group.\n"
+ " If not set the node assumes that it is the first\n"
+ " node in the group (default)\n"
+ " -o, --options=STRING a string of wsrep provider options.\n"
+ " -n, --name=STRING human-readable node name.\n"
+ " -f, --data-dir=PATH a directory to save working data in.\n"
+ " Should be private to the process.\n"
+ " -t, --base-host=ADDRESS address of this node at which other members can\n"
+ " connect to it\n"
+ " -p, --base-port=NUM base port which the node shall listen for\n"
+ " connections from other members. This port will be\n"
+ " used for replication, port+1 for IST and port+2\n"
+ " for SST. Default: 4567\n"
+ " -m, --masters=NUM number of concurrent master workers.\n"
+ " -s, --slaves=NUM number of concurrent slave workers.\n"
+ " (can't be less than 1)\n"
+ " -w, --size=NUM desirable size of the resulting writesets\n"
+ " (approximate lower boundary). Default: 1K\n"
+ " -r, --records=NUM number of records in the store. Default: 1M\n"
+ " -x, --ops=NUM number of operations per transaction. Default: 1\n"
+ " -d, --delay=NUM delay in milliseconds between \"commits\"\n"
+ " (per master thread).\n"
+ " -b, --bootstrap bootstrap the cluster with this node.\n"
+ " Default: 'Yes' if --address is not given, 'No'\n"
+ " otherwise.\n"
+ " -i, --period period in seconds between performance stats output\n"
+ "\n"
+ , prog_name);
+}
+
+static void
+opts_print_config(FILE* out, const struct node_options* opts)
+{
+ fprintf(
+ out,
+ "Continuing with the following configuration:\n"
+ "provider: %s\n"
+ "address: %s\n"
+ "options: %s\n"
+ "name: %s\n"
+ "data dir: %s\n"
+ "base addr: %s:%ld\n"
+ "masters: %ld\n"
+ "slaves: %ld\n"
+ "writeset size: %ld bytes\n"
+ "records: %ld\n"
+ "operations: %ld\n"
+ "commit delay: %ld ms\n"
+ "stats period: %ld s\n"
+ "bootstrap: %s\n"
+ ,
+ opts->provider, opts->address, opts->options, opts->name, opts->data_dir,
+ opts->base_host, opts->base_port,
+ opts->masters, opts->slaves, opts->ws_size, opts->records,
+ opts->operations,
+ opts->delay, opts->period, opts->bootstrap ? "Yes" : "No"
+ );
+}
+
+static int
+opts_check_conversion(int cond, const char* ptr, int idx)
+{
+ if (!cond || errno || (*ptr != '\0' && !isspace(*ptr)))
+ {
+ fprintf(stderr, "Bad value for %s option.\n", s_opts[idx].name);
+ return EINVAL;
+ }
+ return 0;
+}
+
+int
+node_options_read(int argc, char* argv[], struct node_options* opts)
+{
+ *opts = opts_defaults;
+
+ int opt = 0;
+ int opt_idx = 0;
+ char* endptr;
+ int ret = 0;
+
+ bool address_given = false;
+ bool bootstrap_given = false;
+
+ while ((opt = getopt_long(argc, argv, opts_string, s_opts, &opt_idx)) != -1)
+ {
+ switch (opt)
+ {
+ case OPTS_ADDRESS:
+ address_given = strcmp(opts->address, optarg);
+ opts->address = optarg;
+ break;
+ case OPTS_BOOTSTRAP:
+ bootstrap_given = true;
+ opts->bootstrap = true;
+ break;
+ case OPTS_DELAY:
+ opts->delay = strtol(optarg, &endptr, 10);
+ if ((ret = opts_check_conversion(opts->delay >= 0, endptr, opt_idx)))
+ goto err;
+ break;
+ case OPTS_DATA_DIR:
+ opts->data_dir = optarg;
+ break;
+ case OPTS_HELP:
+ ret = 1;
+ goto help;
+ case OPTS_PERIOD:
+ opts->period = strtol(optarg, &endptr, 10);
+ if ((ret = opts_check_conversion(opts->period > 0, endptr, opt_idx)))
+ goto err;
+ break;
+ case OPTS_MASTERS:
+ opts->masters = strtol(optarg, &endptr, 10);
+ if ((ret = opts_check_conversion(opts->masters >= 0, endptr,
+ opt_idx)))
+ goto err;
+ break;
+ case OPTS_NAME:
+ opts->name = optarg;
+ break;
+ case OPTS_OPTIONS:
+ opts->options = optarg;
+ break;
+ case OPTS_BASE_PORT:
+ opts->base_port = strtol(optarg, &endptr, 10);
+ if ((ret = opts_check_conversion(
+ opts->base_port > 0 && opts->base_port < 65536,
+ endptr, opt_idx)))
+ goto err;
+ break;
+ case OPTS_RECORDS:
+ opts->records = strtol(optarg, &endptr, 10);
+ if ((ret = opts_check_conversion(opts->records >= 0, endptr,
+ opt_idx)))
+ goto err;
+ break;
+ case OPTS_SLAVES:
+ opts->slaves = strtol(optarg, &endptr, 10);
+ if ((ret = opts_check_conversion(opts->slaves > 0, endptr, opt_idx)))
+ goto err;
+ break;
+ case OPTS_BASE_HOST:
+ opts->base_host = optarg;
+ break;
+ case OPTS_PROVIDER:
+ opts->provider = optarg;
+ break;
+ case OPTS_WS_SIZE:
+ opts->ws_size = strtol(optarg, &endptr, 10);
+ if ((ret = opts_check_conversion(opts->ws_size > 0, endptr,
+ opt_idx)))
+ goto err;
+ break;
+ case OPTS_OPS:
+ opts->operations = strtol(optarg, &endptr, 10);
+ if ((ret = opts_check_conversion(opts->operations >= 1, endptr,
+ opt_idx)))
+ goto err;
+ break;
+ default:
+ ret = EINVAL;
+ }
+ }
+
+help:
+ if (ret) {
+ opts_print_help(stderr, argv[0]);
+ }
+ else
+ {
+ if (!bootstrap_given)
+ {
+ opts->bootstrap = !address_given;
+ }
+ opts_print_config(stdout, opts);
+ opts->delay *= 1000; /* convert to microseconds for usleep() */
+ }
+
+err:
+ return ret;
+}
diff --git a/wsrep-lib/wsrep-API/v26/examples/node/options.h b/wsrep-lib/wsrep-API/v26/examples/node/options.h
new file mode 100644
index 00000000..62172281
--- /dev/null
+++ b/wsrep-lib/wsrep-API/v26/examples/node/options.h
@@ -0,0 +1,48 @@
+/* Copyright (c) 2019-2020, Codership Oy. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/**
+ * @file This unit defines options interface
+ */
+
+#ifndef NODE_OPTIONS_H
+#define NODE_OPTIONS_H
+
+#include <stdbool.h>
+
+struct node_options
+{
+ const char* provider; // path to wsrep provider
+ const char* address; // wsrep cluster address string
+ const char* options; // wsrep option string
+ const char* name; // node name (for logging purposes)
+ const char* data_dir; // name of the storage file
+ const char* base_host;// host own address
+ long masters; // number of master threads
+ long slaves; // number of slave threads
+ long ws_size; // desired writeset size
+ long records; // total number of records
+ long delay; // delay between commits
+ long base_port;// base port to use
+ long period; // statistics output interval
+ long operations;// number of "statements" in a "transaction"
+ bool bootstrap;// bootstrap the cluster with this node
+};
+
+extern int
+node_options_read(int argc, char* argv[], struct node_options* opts);
+
+#endif /* NODE_OPTIONS_H */
diff --git a/wsrep-lib/wsrep-API/v26/examples/node/socket.c b/wsrep-lib/wsrep-API/v26/examples/node/socket.c
new file mode 100644
index 00000000..377abcaf
--- /dev/null
+++ b/wsrep-lib/wsrep-API/v26/examples/node/socket.c
@@ -0,0 +1,304 @@
+/* Copyright (c) 2019, Codership Oy. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include "socket.h"
+
+#include "log.h"
+
+#include <assert.h>
+#include <ctype.h> // isspace()
+#include <errno.h>
+#include <limits.h> // USHRT_MAX
+#include <netdb.h> // struct addrinfo
+#include <stdio.h> // snprintf()
+#include <string.h> // strerror()
+#include <sys/socket.h> // bind(), connect(), accept(), send(), recv()
+
+struct node_socket
+{
+ int fd;
+};
+
+/**
+ * Initializes addrinfo from the separate host address and port arguments
+ *
+ * Requires calling freeaddrinfo() later
+ *
+ * @param[in] host - if NULL, will be initialized for listening
+ * @param[in] port
+ *
+ * @return struct addrinfo* or NULL in case of error
+ */
+static struct addrinfo*
+socket_get_addrinfo2(const char* const host,
+ uint16_t const port)
+{
+ struct addrinfo const hints =
+ {
+ .ai_flags = AI_PASSIVE | /** will be ignored if host is not NULL */
+ AI_NUMERICSERV, /** service is a numeric port */
+ .ai_family = AF_UNSPEC, /** either IPv4 or IPv6 */
+ .ai_socktype = SOCK_STREAM, /** STREAM or DGRAM */
+ .ai_protocol = 0,
+ .ai_addrlen = 0,
+ .ai_addr = NULL,
+ .ai_canonname = NULL,
+ .ai_next = NULL
+ };
+
+ char service[6];
+ snprintf(service, sizeof(service), "%hu", port);
+
+ struct addrinfo* info;
+ int err = getaddrinfo(host, service, &hints, &info);
+ if (err)
+ {
+ NODE_ERROR("Failed to resolve '%s': %d (%s)",
+ host, err, gai_strerror(err));
+ return NULL;
+ }
+
+ return info;
+}
+
+/**
+ * Initializes addrinfo from single address and port string
+ * The port is expected to be in numerical form and appended to the host address
+ * via colon.
+ *
+ * Requires calling freeaddrinfo() later
+ *
+ * @param[in] addr full address specification, including port
+ *
+ * @return struct addrinfo* or NULL in case of error
+ */
+static struct addrinfo*
+socket_get_addrinfo1(const char* const addr)
+{
+ int const addr_len = (int)strlen(addr);
+ char* const addr_buf = strdup(addr);
+ if (!addr_buf)
+ {
+ NODE_ERROR("strdup(%s) failed: %d (%s)", addr, errno, strerror(errno));
+ return NULL;
+ }
+
+ struct addrinfo* res = NULL;
+ long port;
+ char* endptr;
+
+ int i;
+ for (i = addr_len - 1; i >= 0; i--)
+ {
+ if (addr_buf[i] == ':') break;
+ }
+
+ if (addr_buf[i] != ':')
+ {
+ NODE_ERROR("Malformed address:port string: '%s'", addr);
+ goto end;
+ }
+
+ addr_buf[i] = '\0';
+ port = strtol(addr_buf + i + 1, &endptr, 10);
+
+ if (port <= 0 || port > USHRT_MAX || errno ||
+ (*endptr != '\0' && !isspace(*endptr)))
+ {
+ NODE_ERROR("Malformed/invalid port: '%s'. Errno: %d (%s)",
+ addr_buf + i + 1, errno, strerror(errno));
+ goto end;
+ }
+
+ res = socket_get_addrinfo2(strlen(addr_buf) > 0 ? addr_buf : NULL,
+ (uint16_t)port);
+end:
+ free(addr_buf);
+ return res;
+}
+
+static struct node_socket*
+socket_create(int const fd)
+{
+ assert(fd > 0);
+
+ struct node_socket* res = calloc(1, sizeof(struct node_socket));
+ if (res)
+ {
+ res->fd = fd;
+ }
+ else
+ {
+ NODE_ERROR("Failed to allocate struct node_socket: %d (%s)",
+ errno, strerror(errno));
+ close(fd);
+ }
+
+ return res;
+}
+
+/**
+ * Definition of function type with the signature of bind() and connect()
+ */
+typedef int (*socket_act_fun_t) (int sfd,
+ const struct sockaddr* addr,
+ socklen_t addrlen);
+
+static int
+socket_bind_and_listen(int const sfd,
+ const struct sockaddr* const addr,
+ socklen_t const addrlen)
+{
+ int ret = bind(sfd, addr, addrlen);
+
+ if (!ret)
+ ret = listen(sfd, SOMAXCONN);
+
+ return ret;
+}
+
+/**
+ * A "template" method to do the "right thing" with the addrinfo and create a
+ * socket from it. The "right thing" would normally be bind and listen for
+ * a server socket OR connect for a client socket.
+ *
+ * @param[in] info addrinfo list, swallowed and deallocated
+ * @param[in] action_fun the "right thing" to do on socket and struct sockaddr
+ * @param[in] action_str action description to be printed in the error message
+ * @param[in] orig_host host address to be pronted in the error message
+ * @param[in] orig_port port to be printed in the error message, if orig_host
+ * string contains the port, this parameter should be 0
+ *
+ * The last three parameters are for diagnostic puposes only. orig_host and
+ * orig_port are supposed to be what were used to obtain addrinfo.
+ *
+ * @return new struct node_socket.
+ */
+static struct node_socket*
+socket_from_addrinfo(struct addrinfo* const info,
+ socket_act_fun_t const action_fun,
+ const char* const action_str,
+ const char* const orig_host,
+ uint16_t const orig_port)
+{
+ int sfd;
+ int err = 0;
+
+ /* Iterate over addrinfo list and try to apply action_fun on the resulting
+ * socket. Once successful, break loop. */
+ struct addrinfo* addr;
+ for (addr = info; addr != NULL; addr = addr->ai_next)
+ {
+ sfd = socket(addr->ai_family, addr->ai_socktype, addr->ai_protocol);
+ if (sfd == -1)
+ {
+ err = errno;
+ continue;
+ }
+
+ if (action_fun(sfd, addr->ai_addr, addr->ai_addrlen) == 0) break;
+
+ err = errno;
+ close(sfd);
+ }
+
+ freeaddrinfo(info); /* no longer needed */
+
+ if (!addr)
+ {
+ NODE_ERROR("Failed to %s to '%s%s%.0hu': %d (%s)",
+ action_str,
+ orig_host ? orig_host : "", orig_port > 0 ? ":" : "",
+ orig_port > 0 ? orig_port : 0, /* won't be printed if 0 */
+ err, strerror(err));
+ return NULL;
+ }
+
+ assert(sfd > 0);
+ return socket_create(sfd);
+}
+
+struct node_socket*
+node_socket_listen(const char* const host, uint16_t const port)
+{
+ struct addrinfo* const info = socket_get_addrinfo2(host, port);
+ if (!info) return NULL;
+
+ return socket_from_addrinfo(info, socket_bind_and_listen,
+ "bind a listening socket", host, port);
+}
+
+struct node_socket*
+node_socket_connect(const char* const addr_str)
+{
+ struct addrinfo* const info = socket_get_addrinfo1(addr_str);
+ if (!info) return NULL;
+
+ return socket_from_addrinfo(info, connect, "connect", addr_str, 0);
+}
+
+struct node_socket*
+node_socket_accept(struct node_socket* socket)
+{
+ int sfd = accept(socket->fd, NULL, NULL);
+
+ if (sfd < 0)
+ {
+ NODE_ERROR("Failed to accept connection: %d (%s)",
+ errno, strerror(errno));
+ return NULL;
+ }
+
+ return socket_create(sfd);
+}
+
+int
+node_socket_send_bytes(node_socket_t* socket, const void* buf, size_t len)
+{
+ ssize_t const ret = send(socket->fd, buf, len, MSG_NOSIGNAL);
+
+ if (ret != (ssize_t)len)
+ {
+ NODE_ERROR("Failed to send %zu bytes: %d (%s)", errno, strerror(errno));
+ return -1;
+ }
+
+ return 0;
+}
+
+int
+node_socket_recv_bytes(node_socket_t* socket, void* buf, size_t len)
+{
+ ssize_t const ret = recv(socket->fd, buf, len, MSG_WAITALL);
+
+ if (ret != (ssize_t)len)
+ {
+ NODE_ERROR("Failed to recv %zu bytes: %d (%s)", errno, strerror(errno));
+ return -1;
+ }
+
+ return 0;
+}
+
+void
+node_socket_close(node_socket_t* socket)
+{
+ if (!socket) return;
+
+ if (socket->fd > 0) close(socket->fd);
+
+ free(socket);
+}
diff --git a/wsrep-lib/wsrep-API/v26/examples/node/socket.h b/wsrep-lib/wsrep-API/v26/examples/node/socket.h
new file mode 100644
index 00000000..3a77eff3
--- /dev/null
+++ b/wsrep-lib/wsrep-API/v26/examples/node/socket.h
@@ -0,0 +1,72 @@
+/* Copyright (c) 2019, Codership Oy. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/**
+ * @file This unit implements auxiliary networking functions (for SST purposes)
+ * It has nothing wsrep related and is not of general purpose.
+ */
+
+#ifndef NODE_SOCKET_H
+#define NODE_SOCKET_H
+
+#include <stddef.h> // size_t
+#include <stdint.h> // uint16_t
+
+typedef struct node_socket node_socket_t;
+
+/**
+ * Open listening socket at a given address
+ *
+ * @return listening socket
+ */
+extern node_socket_t*
+node_socket_listen(const char* host, uint16_t port);
+
+/**
+ * Connect to a given address.
+ *
+ * @return connected socket
+ */
+extern node_socket_t*
+node_socket_connect(const char* addr);
+
+/**
+ * Wait for connection on a listening socket
+ * @return connected socket
+ */
+extern node_socket_t*
+node_socket_accept(node_socket_t* s);
+
+/**
+ * Send a given number of bytes
+ * @return 0 or a negative error code
+ */
+extern int
+node_socket_send_bytes(node_socket_t* s, const void* buf, size_t len);
+
+/**
+ * Receive a given number of bytes
+ * @return 0 or a negative error code
+ */
+extern int
+node_socket_recv_bytes(node_socket_t* s, void* buf, size_t len);
+
+/**
+ * Release all recources associated with the socket */
+extern void
+node_socket_close(node_socket_t* s);
+
+#endif /* NODE_SOCKET_H */
diff --git a/wsrep-lib/wsrep-API/v26/examples/node/sst.c b/wsrep-lib/wsrep-API/v26/examples/node/sst.c
new file mode 100644
index 00000000..e93534ef
--- /dev/null
+++ b/wsrep-lib/wsrep-API/v26/examples/node/sst.c
@@ -0,0 +1,372 @@
+/* Copyright (c) 2019, Codership Oy. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include "sst.h"
+
+#include "ctx.h"
+#include "log.h"
+#include "socket.h"
+
+#include <arpa/inet.h> // htonl()
+#include <assert.h>
+#include <errno.h>
+#include <pthread.h>
+#include <stdio.h> // snprintf()
+#include <stdlib.h> // abort()
+#include <string.h> // strdup()
+#include <unistd.h> // usleep()
+
+/**
+ * Helper: creates detached thread */
+static int
+sst_create_thread(void* (*thread_routine) (void*),
+ void* const thread_arg)
+{
+ pthread_t thr;
+ pthread_attr_t attr;
+ int ret = pthread_attr_init(&attr);
+ ret = ret ? ret : pthread_attr_setdetachstate(&attr,PTHREAD_CREATE_DETACHED);
+ ret = ret ? ret : pthread_create(&thr, &attr, thread_routine, thread_arg);
+ return ret;
+}
+
+/**
+ * Helper: creates detached thread and waits for it to call
+ * sst_sync_with_parent() */
+static void
+sst_create_and_sync(const char* const role,
+ pthread_mutex_t* const mtx,
+ pthread_cond_t* const cond,
+ void* (*thread_routine) (void*),
+ void* const thread_arg)
+{
+ int ret = pthread_mutex_lock(mtx);
+ if (ret)
+ {
+ NODE_FATAL("Failed to lock %s mutex: %d (%s)", role, ret, strerror(ret));
+ abort();
+ }
+
+ ret = sst_create_thread(thread_routine, thread_arg);
+ if (ret)
+ {
+ NODE_FATAL("Failed to create detached %s thread: %d (%s)",
+ role, ret, strerror(ret));
+ abort();
+ }
+
+ ret = pthread_cond_wait(cond, mtx);
+ if (ret)
+ {
+ NODE_FATAL("Failed to synchronize with %s thread: %d (%s)",
+ role, ret, strerror(ret));
+ abort();
+ }
+
+ pthread_mutex_unlock(mtx);
+}
+
+/**
+ * Helper: syncs with parent thread and allows it to continue and return
+ * asynchronously */
+static void
+sst_sync_with_parent(const char* role,
+ pthread_mutex_t* mtx,
+ pthread_cond_t* cond)
+{
+ int ret = pthread_mutex_lock(mtx);
+ if (ret)
+ {
+ NODE_FATAL("Failed to lock %s mutex: %d (%s)", role, ret, strerror(ret));
+ abort();
+ }
+
+ NODE_INFO("Initialized %s thread", role);
+
+ pthread_cond_signal(cond);
+ pthread_mutex_unlock(mtx);
+}
+
+static pthread_mutex_t sst_joiner_mtx = PTHREAD_MUTEX_INITIALIZER;
+static pthread_cond_t sst_joiner_cond = PTHREAD_COND_INITIALIZER;
+
+struct sst_joiner_ctx
+{
+ struct node_ctx* node;
+ node_socket_t* socket;
+};
+
+/**
+ * waits for SST completion and signals the provider to continue */
+static void*
+sst_joiner_thread(void* ctx)
+{
+ assert(ctx);
+
+ struct node_ctx* const node = ((struct sst_joiner_ctx*)ctx)->node;
+ node_socket_t* const listen = ((struct sst_joiner_ctx*)ctx)->socket;
+ ctx = NULL; /* may be unusable after next statement */
+
+ /* this allows parent callback to return */
+ sst_sync_with_parent("JOINER", &sst_joiner_mtx, &sst_joiner_cond);
+
+ wsrep_gtid_t state_gtid = WSREP_GTID_UNDEFINED;
+ int err = -1;
+
+ /* REPLICATION: wait for donor to connect and send the state snapshot */
+ node_socket_t* const connected = node_socket_accept(listen);
+ if (!connected) goto end;
+
+ uint32_t state_len;
+ err = node_socket_recv_bytes(connected, &state_len, sizeof(state_len));
+ if (err) goto end;
+
+ state_len = ntohl(state_len);
+ if (state_len > 0)
+ {
+ /* REPLICATION: get the state of state_len size */
+ void* state = malloc(state_len);
+ if (state)
+ {
+ err = node_socket_recv_bytes(connected, state, state_len);
+ if (err)
+ {
+ free(state);
+ goto end;
+ }
+
+ /* REPLICATION: install the newly received state. */
+ err = node_store_init_state(node->store, state, state_len);
+ free(state);
+ if (err) goto end;
+ }
+ else
+ {
+ NODE_ERROR("Failed to allocate %zu bytes for state snapshot.",
+ state_len);
+ err = -ENOMEM;
+ goto end;
+ }
+ }
+ else
+ {
+ /* REPLICATION: it was a bypass, the node will receive missing data via
+ * IST. It starts with the state it currently has. */
+ }
+
+ /* REPLICATION: find gtid of the received state to report to provider */
+ node_store_gtid(node->store, &state_gtid);
+
+end:
+ assert(err <= 0);
+ node_socket_close(connected);
+ node_socket_close(listen);
+
+ /* REPLICATION: tell provider that SST is received */
+ wsrep_status_t sst_ret;
+ wsrep_t* const wsrep = node_wsrep_provider(node->wsrep);
+ sst_ret = wsrep->sst_received(wsrep, &state_gtid, NULL, err);
+
+ if (WSREP_OK != sst_ret)
+ {
+ NODE_FATAL("Failed to report completion of SST: %d", sst_ret);
+ abort();
+ }
+
+ return NULL;
+}
+
+enum wsrep_cb_status
+node_sst_request_cb (void* const app_ctx,
+ void** const sst_req,
+ size_t* const sst_req_len)
+{
+ static int const SST_PORT_OFFSET = 2;
+
+ assert(app_ctx);
+ struct node_ctx* const node = app_ctx;
+ const struct node_options* const opts = node->opts;
+
+ char* sst_str = NULL;
+
+ /* REPLICATION: 1. prepare the node to receive SST */
+ uint16_t const sst_port = (uint16_t)(opts->base_port + SST_PORT_OFFSET);
+ size_t const sst_len = strlen(opts->base_host)
+ + 1 /* ':' */ + 5 /* max port len */ + 1 /* \0 */;
+ sst_str = malloc(sst_len);
+ if (!sst_str)
+ {
+ NODE_ERROR("Failed to allocate %zu bytes for SST request", sst_len);
+ goto end;
+ }
+
+ /* write in request the address at which we listen */
+ int ret = snprintf(sst_str, sst_len, "%s:%hu", opts->base_host, sst_port);
+ if (ret < 0 || (size_t)ret >= sst_len)
+ {
+ free(sst_str);
+ sst_str = NULL;
+ NODE_ERROR("Failed to write a SST request");
+ goto end;
+ }
+
+ node_socket_t* const socket = node_socket_listen(NULL, sst_port);
+ if (!socket)
+ {
+ free(sst_str);
+ sst_str = NULL;
+ NODE_ERROR("Failed to listen at %s", sst_str);
+ goto end;
+ }
+
+ /* REPLICATION 2. start the "joiner" thread that will wait for SST and
+ * report its success to provider, and syncronize with it. */
+ struct sst_joiner_ctx ctx =
+ {
+ .node = node,
+ .socket = socket
+ };
+ sst_create_and_sync("JOINER", &sst_joiner_mtx, &sst_joiner_cond,
+ sst_joiner_thread, &ctx);
+
+ NODE_INFO("Waiting for SST at %s", sst_str);
+
+end:
+ if (sst_str)
+ {
+ *sst_req = sst_str;
+ *sst_req_len = strlen(sst_str) + 1;
+ }
+ else
+ {
+ *sst_req = NULL;
+ *sst_req_len = 0;
+ return WSREP_CB_FAILURE;
+ }
+
+ /* REPLICATION 3. return SST request to provider */
+ return WSREP_CB_SUCCESS;
+}
+
+static pthread_mutex_t sst_donor_mtx = PTHREAD_MUTEX_INITIALIZER;
+static pthread_cond_t sst_donor_cond = PTHREAD_COND_INITIALIZER;
+
+struct sst_donor_ctx
+{
+ wsrep_gtid_t state;
+ struct node_ctx* node;
+ node_socket_t* socket;
+ wsrep_bool_t bypass;
+};
+
+/**
+ * donates SST and signals provider that it is done. */
+static void*
+sst_donor_thread(void* const args)
+{
+ struct sst_donor_ctx const ctx = *(struct sst_donor_ctx*)args;
+
+ int err = 0;
+ const void* state;
+ size_t state_len;
+
+ if (ctx.bypass)
+ {
+ /* REPLICATION: if bypass is true, there is no need to send snapshot,
+ * just signal the joiner that snapshot is not needed and
+ * it can proceed to apply IST. We'll do it by sending 0
+ * for the size of snapshot */
+ state = NULL;
+ state_len = 0;
+ }
+ else
+ {
+ /* REPLICATION: if bypass is false, we need to send a full state snapshot
+ * Get hold of the state, which is currently just GTID
+ * NOTICE that while parent is waiting, the store is in a
+ * quiescent state, provider blocking any modifications. */
+ err = node_store_acquire_state(ctx.node->store, &state, &state_len);
+ if (state_len > UINT32_MAX) err = -ERANGE;
+ }
+
+ /* REPLICATION: after getting hold of the state we can allow parent callback
+ * to return and the node to resume its normal operation */
+ sst_sync_with_parent("DONOR", &sst_donor_mtx, &sst_donor_cond);
+
+ if (err >= 0)
+ {
+ uint32_t tmp = htonl((uint32_t)state_len);
+ err = node_socket_send_bytes(ctx.socket, &tmp, sizeof(tmp));
+ }
+
+ if (state_len != 0)
+ {
+ if (err >= 0)
+ {
+ assert(state);
+ err = node_socket_send_bytes(ctx.socket, state, state_len);
+ }
+
+ node_store_release_state(ctx.node->store);
+ }
+
+ node_socket_close(ctx.socket);
+
+ /* REPLICATION: signal provider the success of the operation */
+ wsrep_t* const wsrep = node_wsrep_provider(ctx.node->wsrep);
+ wsrep->sst_sent(wsrep, &ctx.state, err);
+
+ return NULL;
+}
+
+enum wsrep_cb_status
+node_sst_donate_cb (void* const app_ctx,
+ void* const recv_ctx,
+ const wsrep_buf_t* const str_msg,
+ const wsrep_gtid_t* const state_id,
+ const wsrep_buf_t* const state,
+ wsrep_bool_t const bypass)
+{
+ (void)recv_ctx;
+ (void)state;
+
+ struct sst_donor_ctx ctx =
+ {
+ .node = app_ctx,
+ .state = *state_id,
+ .bypass = bypass
+ };
+
+ /* we are expecting a human-readable 0-terminated string */
+ void* p = memchr(str_msg->ptr, '\0', str_msg->len);
+ if (!p)
+ {
+ NODE_ERROR("Received a badly formed State Transfer Request.");
+ /* REPLICATION: in case of a failure we return the status to provider, so
+ * that the joining node can be notified of it by cluster */
+ return WSREP_CB_FAILURE;
+ }
+
+ const char* addr = str_msg->ptr;
+ ctx.socket = node_socket_connect(addr);
+
+ if (!ctx.socket) return WSREP_CB_FAILURE;
+
+ sst_create_and_sync("DONOR", &sst_donor_mtx, &sst_donor_cond,
+ sst_donor_thread, &ctx);
+
+ return WSREP_CB_SUCCESS;
+}
diff --git a/wsrep-lib/wsrep-API/v26/examples/node/sst.h b/wsrep-lib/wsrep-API/v26/examples/node/sst.h
new file mode 100644
index 00000000..7006a1b6
--- /dev/null
+++ b/wsrep-lib/wsrep-API/v26/examples/node/sst.h
@@ -0,0 +1,39 @@
+/* Copyright (c) 2019, Codership Oy. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/**
+ * @file This unit defines SST interface
+ */
+
+#ifndef NODE_SST_H
+#define NODE_SST_H
+
+#include "../../wsrep_api.h"
+
+extern enum wsrep_cb_status
+node_sst_request_cb (void* app_ctx,
+ void** sst_req,
+ size_t* sst_req_len);
+
+extern enum wsrep_cb_status
+node_sst_donate_cb (void* app_ctx,
+ void* recv_ctx,
+ const wsrep_buf_t* str_msg,
+ const wsrep_gtid_t* state_id,
+ const wsrep_buf_t* state,
+ wsrep_bool_t bypass);
+
+#endif /* NODE_SST_H */
diff --git a/wsrep-lib/wsrep-API/v26/examples/node/stats.c b/wsrep-lib/wsrep-API/v26/examples/node/stats.c
new file mode 100644
index 00000000..4b02240f
--- /dev/null
+++ b/wsrep-lib/wsrep-API/v26/examples/node/stats.c
@@ -0,0 +1,215 @@
+/* Copyright (c) 2019-2020, Codership Oy. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include "stats.h"
+
+#include "log.h"
+
+#include <assert.h>
+#include <errno.h>
+#include <stdio.h> // snprintf()
+#include <stdlib.h> // abort()
+#include <string.h> // strcmp()
+#include <unistd.h> // usleep()
+
+enum
+{
+ STATS_REPL_BYTE,
+ STATS_REPL_WS,
+ STATS_RECV_BYTE,
+ STATS_RECV_WS,
+ STATS_TOTAL_BYTE,
+ STATS_TOTAL_WS,
+ STATS_CERT_FAILS,
+ STATS_STORE_FAILS,
+ STATS_FC_PAUSED,
+ STATS_MAX
+};
+
+static const char* const stats_legend[STATS_MAX] =
+{
+ " repl(B/s)",
+ " repl(W/s)",
+ " recv(B/s)",
+ " recv(W/s)",
+ "total(B/s)",
+ "total(W/s)",
+ " cert.fail",
+ " stor.fail",
+ " paused(%)"
+};
+
+/* stats IDs in provider output - provider dependent, here we use Galera's */
+static const char* const galera_ids[STATS_MAX] =
+{
+ "replicated_bytes", /**< STATS_REPL_BYTE */
+ "replicated", /**< STATS_REPL_WS */
+ "received_bytes", /**< STATS_RECV_BYTE */
+ "received", /**< STATS_RECV_WS */
+ "", /**< STATS_TOTAL_BYTE */
+ "", /**< STATS_TOTAL_WS */
+ "local_cert_failures", /**< STATS_CERT_FAILS */
+ "", /**< STATS_STORE_FAILS */
+ "flow_control_paused_ns" /**< STATS_FC_PAUSED */
+};
+
+/* maps local stats IDs to provider stat IDs */
+static int stats_galera_map[STATS_MAX];
+
+/**
+ * Helper to map provider stats to own stats set */
+static void
+stats_establish_mapping(wsrep_t* const wsrep)
+{
+ int const magic_map = -1;
+ size_t i;
+ for (i = 0; i < sizeof(stats_galera_map)/sizeof(stats_galera_map[0]); i++)
+ {
+ stats_galera_map[i] = magic_map; /* initialize map array */
+ }
+
+ struct wsrep_stats_var* const stats = wsrep->stats_get(wsrep);
+
+ /* to compensate for STATS_TOTAL_* and STATS_STORE_FAILS having no
+ * counterparts */
+ int mapped = 3;
+
+ i = 0;
+ while (stats[i].name) /* stats array is terminated by Null name */
+ {
+ int j;
+ for (j = 0; j < STATS_MAX; j++)
+ {
+ if (magic_map == stats_galera_map[j] /* j-th member still unset */
+ &&
+ !strcmp(stats[i].name, galera_ids[j]))
+ {
+ stats_galera_map[j] = (int)i;
+ mapped++;
+ if (STATS_MAX == mapped) /* all mapped */ goto out;
+ }
+ }
+
+ i++;
+ }
+
+out:
+ wsrep->stats_free(wsrep, stats);
+}
+
+static void
+stats_get(node_store_t* const store, wsrep_t* const wsrep, long long stats[])
+{
+ stats[STATS_STORE_FAILS] = node_store_read_view_failures(store);
+
+ struct wsrep_stats_var* const ret = wsrep->stats_get(wsrep);
+ if (!ret)
+ {
+ NODE_FATAL("wsrep::stats_get() call failed.");
+ abort();
+ }
+
+ int i;
+ for (i = 0; i < STATS_MAX; i++)
+ {
+ int j = stats_galera_map[i];
+ if (j >= 0)
+ {
+ assert(WSREP_VAR_INT64 == ret[j].type);
+ stats[i] = ret[j].value._int64;
+ }
+ }
+
+ wsrep->stats_free(wsrep, ret);
+
+ // totals are just sums
+ stats[STATS_TOTAL_BYTE] = stats[STATS_REPL_BYTE] + stats[STATS_RECV_BYTE];
+ stats[STATS_TOTAL_WS ] = stats[STATS_REPL_WS ] + stats[STATS_RECV_WS ];
+}
+
+static void
+stats_print(long long bef[], long long aft[], double period)
+{
+ double rate[STATS_MAX];
+ int i;
+ for (i = 0; i < STATS_MAX; i++)
+ {
+ rate[i] = (double)(aft[i] - bef[i])/period;
+ }
+ rate[STATS_FC_PAUSED] /= 1.0e+07; // nanoseconds to % of seconds
+
+ char str[256];
+ int written = 0;
+
+ /* first line write legend */
+ for (i = 0; i < STATS_MAX; i++)
+ {
+ size_t const space_left = sizeof(str) - (size_t)written;
+ written += snprintf(&str[written], space_left, "%s", stats_legend[i]);
+ }
+
+ str[written] = '\n';
+ written++;
+
+ /* second line write values */
+ for (i = 0; i < STATS_MAX; i++)
+ {
+ size_t const space_left = sizeof(str) - (size_t)written;
+ long long const value = (long long)rate[i];
+ written += snprintf(&str[written], space_left, " %9lld", value);
+ }
+
+ str[written] = '\0';
+
+ /* use logging macro for timestamp */
+ NODE_INFO("\n%s", str);
+}
+
+void
+node_stats_loop(const struct node_ctx* const node, int const period)
+{
+ double const period_sec = period;
+ useconds_t const period_usec = (useconds_t)period * 1000000;
+
+ wsrep_t* const wsrep = node_wsrep_provider(node->wsrep);
+ stats_establish_mapping(wsrep);
+
+ long long stats1[STATS_MAX];
+ long long stats2[STATS_MAX];
+
+ stats_get(node->store, wsrep, stats1);
+
+ while (1)
+ {
+ if (usleep(period_usec)) break;
+ stats_get(node->store, wsrep, stats2);
+ stats_print(stats1, stats2, period_sec);
+
+ if (usleep(period_usec)) break;
+ stats_get(node->store, wsrep, stats1);
+ stats_print(stats2, stats1, period_sec);
+ }
+
+ if (EINTR != errno)
+ {
+ NODE_ERROR("Unexpected usleep(%lld) error: %d (%s)",
+ (long long)period_usec, errno, strerror(errno));
+ }
+ else
+ {
+ /* interrupted by signal */
+ }
+}
diff --git a/wsrep-lib/wsrep-API/v26/examples/node/stats.h b/wsrep-lib/wsrep-API/v26/examples/node/stats.h
new file mode 100644
index 00000000..f7ab7ef4
--- /dev/null
+++ b/wsrep-lib/wsrep-API/v26/examples/node/stats.h
@@ -0,0 +1,35 @@
+/* Copyright (c) 2019, Codership Oy. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/**
+ * @file This unit defines performance statistics loop
+ */
+
+#ifndef NODE_STATS_H
+#define NODE_STATS_H
+
+#include "ctx.h"
+
+/**
+ * Prints out statistics with a given period.
+ *
+ * @param[in] node node context
+ * @param[in] period in seconds
+ */
+extern void
+node_stats_loop(const struct node_ctx* node, int period);
+
+#endif /* NODE_STATS_H */
diff --git a/wsrep-lib/wsrep-API/v26/examples/node/store.c b/wsrep-lib/wsrep-API/v26/examples/node/store.c
new file mode 100644
index 00000000..1dc2d6c1
--- /dev/null
+++ b/wsrep-lib/wsrep-API/v26/examples/node/store.c
@@ -0,0 +1,1044 @@
+/* Copyright (c) 2019-2020, Codership Oy. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include "store.h"
+
+#include "log.h"
+
+#include <assert.h>
+#include <errno.h>
+#include <pthread.h>
+#include <stdbool.h>
+#include <stddef.h> // ptrdiff_t
+#include <stdint.h> // uintptr_t
+#include <stdlib.h> // abort()
+#include <string.h> // memset()
+
+#define DECLARE_SERIALIZE_INT(INTTYPE) \
+ static inline size_t \
+ store_serialize_##INTTYPE(void* const to, INTTYPE##_t const from) \
+ { \
+ memcpy(to, &from, sizeof(from)); /* for simplicity ignore endianness */ \
+ return sizeof(from); \
+ }
+
+DECLARE_SERIALIZE_INT(uint32);
+DECLARE_SERIALIZE_INT(int64);
+
+#define DECLARE_DESERIALIZE_INT(INTTYPE) \
+ static inline size_t \
+ store_deserialize_##INTTYPE(INTTYPE##_t* const to, const void* const from) \
+ { \
+ memcpy(to, from, sizeof(*to)); /* for simplicity ignore endianness */ \
+ return sizeof(*to); \
+ }
+
+DECLARE_DESERIALIZE_INT(uint32);
+DECLARE_DESERIALIZE_INT(int64);
+
+typedef struct record
+{
+ wsrep_seqno_t version;
+ uint32_t value;
+ /* this order ensures that there is no padding between the members */
+}
+record_t;
+
+#define STORE_RECORD_SIZE \
+ (sizeof(((record_t*)(NULL))->version) + sizeof(((record_t*)(NULL))->value))
+
+static inline size_t
+store_record_set(void* const base,
+ size_t const index,
+ const record_t* const record)
+{
+ char* const position = (char*)base + index*STORE_RECORD_SIZE;
+ memcpy(position, record, STORE_RECORD_SIZE);
+ return STORE_RECORD_SIZE;
+}
+
+static inline size_t
+store_record_get(const void* const base,
+ size_t const index,
+ record_t* const record)
+{
+ const char* const position = (const char*)base + index*STORE_RECORD_SIZE;
+ memcpy(record, position, STORE_RECORD_SIZE);
+ return STORE_RECORD_SIZE;
+}
+
+static inline bool
+store_record_equal(const record_t* const lhs, const record_t* const rhs)
+{
+ return (lhs->version == rhs->version) && (lhs->value == rhs->value);
+}
+
+/* transaction context */
+struct store_trx_op
+{
+ /* Normally what we'd need for transaction context is the record index and
+ * new record value. Here we also save read view snapshot (rec_from & rec_to)
+ * to
+ * 1. test provider certification correctness if provider supports read view
+ * 2. if not, detect conflicts at a store level. */
+ record_t rec_from;
+ record_t rec_to;
+ uint32_t idx_from;
+ uint32_t idx_to;
+ uint32_t new_value;
+ uint32_t size; /* nominal "size" of operation to manipulate on-the-wire
+ * writeset size. */
+};
+
+#define STORE_OP_SIZE (STORE_RECORD_SIZE + STORE_RECORD_SIZE + \
+ sizeof(((struct store_trx_op*)NULL)->idx_from) + \
+ sizeof(((struct store_trx_op*)NULL)->idx_to) + \
+ sizeof(((struct store_trx_op*)NULL)->new_value) + \
+ sizeof(((struct store_trx_op*)NULL)->size))
+
+struct store_trx_ctx
+{
+ wsrep_gtid_t rv_gtid;
+ size_t ops_num;
+ struct store_trx_op* ops;
+};
+
+static inline bool
+store_trx_add_op(struct store_trx_ctx* const trx)
+{
+ struct store_trx_op* const new_ops =
+ realloc(trx->ops, sizeof(struct store_trx_op)*(trx->ops_num + 1));
+
+ if (new_ops)
+ {
+ trx->ops = new_ops;
+#ifndef NDEBUG
+ memset(&trx->ops[trx->ops_num], 0, sizeof(*trx->ops));
+#endif
+ trx->ops_num++;
+ }
+
+ return (NULL == new_ops);
+}
+
+struct store_trx_entry
+{
+ bool used;
+ struct store_trx_ctx ctx;
+};
+
+typedef wsrep_uuid_t member_t;
+
+struct node_store
+{
+ wsrep_gtid_t gtid;
+ pthread_mutex_t gtid_mtx;
+ wsrep_trx_id_t trx_id;
+ pthread_mutex_t trx_id_mtx;
+ char* snapshot;
+ member_t* members;
+ void* records;
+ size_t op_size;
+ long read_view_fails;
+ uint32_t members_num;
+ uint32_t records_num;
+ uint32_t entries_mask;
+ bool read_view_support; // read view support by cluster
+ /* trx pool piggybacked */
+};
+
+node_store_t*
+node_store_open(const struct node_options* const opts)
+{
+ /* make the size of trx pool the next highest power of 2 over the total
+ * number of workers */
+ uint32_t trx_pool_mask = (uint32_t)(opts->masters + opts->slaves);
+ if (trx_pool_mask > 0)
+ {
+ trx_pool_mask -= 1;
+ trx_pool_mask |= trx_pool_mask >> 1;
+ trx_pool_mask |= trx_pool_mask >> 2;
+ trx_pool_mask |= trx_pool_mask >> 4;
+ trx_pool_mask |= trx_pool_mask >> 8;
+ trx_pool_mask |= trx_pool_mask >> 16;
+ }
+ assert(((trx_pool_mask + 1) & trx_pool_mask) == 0); // 2^n - 1
+
+ size_t const desired_op_size = (size_t)(opts->ws_size/opts->operations);
+ size_t const op_size = (desired_op_size > STORE_OP_SIZE ?
+ desired_op_size : STORE_OP_SIZE);
+
+ /* since the number of workers will never change, we can allocate trx pool
+ * together with the main store struc */
+ size_t const store_alloc_size = sizeof(struct node_store) +
+ /* op_size - additional buffer for op serialization per trx */
+ (sizeof(struct store_trx_entry) + op_size)*(trx_pool_mask + 1);
+
+ struct node_store* const ret = malloc(store_alloc_size);
+
+ if (ret)
+ {
+ memset(ret, 0, store_alloc_size);
+ ret->records = malloc((size_t)opts->records * STORE_RECORD_SIZE);
+
+ if (ret->records)
+ {
+ ret->gtid = WSREP_GTID_UNDEFINED;
+ pthread_mutex_init(&ret->gtid_mtx, NULL);
+ pthread_mutex_init(&ret->trx_id_mtx, NULL);
+ ret->op_size = op_size;
+ ret->records_num = (uint32_t)opts->records;
+ ret->entries_mask = trx_pool_mask;
+
+ uint32_t i;
+ for (i = 0; i < ret->records_num; i++)
+ {
+ /* keep state in serialized form for easy snapshotting */
+ struct record const record = { WSREP_SEQNO_UNDEFINED, i };
+ store_record_set(ret->records, i, &record);
+ }
+
+ return ret;
+ }
+ else
+ {
+ free(ret);
+ }
+ }
+
+ return NULL;
+}
+
+void
+node_store_close(struct node_store* const store)
+{
+ assert(store);
+ assert(store->records);
+ pthread_mutex_destroy(&store->gtid_mtx);
+ pthread_mutex_destroy(&store->trx_id_mtx);
+ free(store->records);
+ free(store->members);
+ free(store);
+}
+
+#define STORE_MUTEX_LOCK(mtx) \
+ { \
+ int err = pthread_mutex_lock(mtx); \
+ if (err) \
+ { \
+ NODE_FATAL("Failed to lock " #mtx ": %d (%s)", \
+ err, strerror(err)); \
+ abort(); \
+ } \
+ }
+
+static inline struct store_trx_entry*
+store_get_trx_entry(struct node_store* const store, wsrep_trx_id_t const trx_id)
+{
+ return (struct store_trx_entry*)
+ ((char*)(store + 1) + (trx_id & store->entries_mask)*
+ (sizeof(struct store_trx_entry) + store->op_size));
+}
+
+static inline struct store_trx_ctx*
+store_get_trx_ctx(struct node_store* const store, wsrep_trx_id_t const trx_id)
+{
+ return &(store_get_trx_entry(store, trx_id)->ctx);
+}
+
+static inline wsrep_trx_id_t
+store_new_trx_id(struct node_store* const store)
+{
+ wsrep_trx_id_t ret;
+ struct store_trx_entry* trx;
+
+ STORE_MUTEX_LOCK(&store->trx_id_mtx);
+
+ do
+ {
+ store->trx_id++;
+ trx = store_get_trx_entry(store, store->trx_id);
+ }
+ while (trx->used);
+ trx->used = true;
+ ret = store->trx_id;
+
+ pthread_mutex_unlock(&store->trx_id_mtx);
+
+ memset(&trx->ctx, 0, sizeof(trx->ctx));
+
+ return ret;
+}
+
+static inline void
+store_free_trx_id(struct node_store* const store, wsrep_trx_id_t const trx_id)
+{
+ struct store_trx_entry* const trx = store_get_trx_entry(store, trx_id);
+ assert(trx->used);
+ free(trx->ctx.ops);
+
+ STORE_MUTEX_LOCK(&store->trx_id_mtx);
+
+ trx->used = false;
+
+ pthread_mutex_unlock(&store->trx_id_mtx);
+}
+
+/**
+ * deserializes membership from snapshot */
+static int
+store_new_members(const char* ptr, const char* const endptr,
+ uint32_t* const num, member_t** const memb)
+{
+ ptr += store_deserialize_uint32(num, ptr);
+
+ if (*num < 2)
+ {
+ NODE_ERROR("Bogus number of members %u", *num);
+ return -1;
+ }
+
+ int ret = (int)sizeof(*num);
+
+ size_t const msize = sizeof(member_t) * *num;
+ if ((endptr - ptr) < (ptrdiff_t)msize)
+ {
+ NODE_ERROR("State snapshot does not contain all membership: "
+ "%zd < %zu", endptr - ptr, msize);
+ return -1;
+ }
+
+ *memb = calloc(*num, sizeof(member_t));
+ if (!*memb)
+ {
+ NODE_ERROR("Could not allocate new membership");
+ return -ENOMEM;
+ }
+
+ memcpy(*memb, ptr, msize);
+
+ return ret + (int)msize;
+}
+
+/**
+ * deserializes records from snapshot */
+static int
+store_new_records(const char* ptr, const char* const endptr,
+ uint32_t* const num, void** const rec)
+{
+ ptr += store_deserialize_uint32(num, ptr);
+
+ int ret = (int)sizeof(*num);
+ if (!*num)
+ {
+ *rec = NULL;
+ return ret;
+ }
+
+ size_t const rsize = STORE_RECORD_SIZE * *num;
+ if ((endptr - ptr) < (ptrdiff_t)rsize)
+ {
+ NODE_ERROR("State snapshot does not contain all records: "
+ "%zu < %zu", endptr - ptr, rsize);
+ return -1;
+ }
+
+ *rec = malloc(rsize);
+ if (!*rec)
+ {
+ NODE_ERROR("Could not allocate new records");
+ return -ENOMEM;
+ }
+
+ memcpy(*rec, ptr, rsize);
+
+ return ret + (int)rsize;
+}
+
+int
+node_store_init_state(struct node_store* const store,
+ const void* const state,
+ size_t const state_len)
+{
+ /* First, deserialize and prepare new state */
+ if (state_len <= sizeof(member_t)*2 /* at least two members */ +
+ WSREP_UUID_STR_LEN + 1 /* : */ + 1 /* seqno */ + 1 /* \0 */)
+ {
+ NODE_ERROR("State snapshot too short: %zu", state_len);
+ return -1;
+ }
+
+ wsrep_gtid_t state_gtid;
+ int ret;
+ ret = wsrep_gtid_scan(state, state_len, &state_gtid);
+ if (ret < 0)
+ {
+ char state_str[WSREP_GTID_STR_LEN + 1] = { 0, };
+ memcpy(state_str, state, sizeof(state_str) - 1);
+ NODE_ERROR("Could not find valid GTID in the received data: %s",
+ state_str);
+ return -1;
+ }
+
+ ret++; /* \0 */
+ if ((state_len - (size_t)ret) < sizeof(uint32_t))
+ {
+ NODE_ERROR("State snapshot does not contain the number of members");
+ return -1;
+ }
+
+ const char* ptr = ((char*)state);
+ const char* const endptr = ptr + state_len;
+ ptr += ret;
+
+ uint32_t m_num;
+ member_t* new_members;
+ ret = store_new_members(ptr, endptr, &m_num, &new_members);
+ if (ret < 0)
+ {
+ return ret;
+ }
+ ptr += ret;
+
+ bool const read_view_support = ptr[0];
+ ptr += 1;
+
+ uint32_t r_num;
+ void* new_records;
+ ret = store_new_records(ptr, endptr, &r_num, &new_records);
+ if (ret < 0)
+ {
+ free(new_members);
+ return ret;
+ }
+ ptr += ret;
+
+ STORE_MUTEX_LOCK(&store->gtid_mtx);
+
+ /* just a sanity check */
+ if (0 == wsrep_uuid_compare(&state_gtid.uuid, &store->gtid.uuid) &&
+ state_gtid.seqno < store->gtid.seqno)
+ {
+ NODE_ERROR("Received snapshot that is in the past: my seqno %lld,"
+ " received seqno: %lld",
+ (long long)store->gtid.seqno, (long long)state_gtid.seqno);
+ free(new_members);
+ free(new_records);
+ ret = -1;
+ }
+ else
+ {
+ free(store->members);
+ store->members_num = m_num;
+ store->members = new_members;
+ free(store->records);
+ store->records_num = r_num;
+ store->records = new_records;
+ store->gtid = state_gtid;
+ store->read_view_support = read_view_support;
+ ret = 0;
+ }
+
+ pthread_mutex_unlock(&store->gtid_mtx);
+
+ return ret;
+}
+
+int
+node_store_acquire_state(node_store_t* const store,
+ const void** const state,
+ size_t* const state_len)
+{
+ int ret = 0;
+
+ STORE_MUTEX_LOCK(&store->gtid_mtx);
+
+ if (!store->snapshot)
+ {
+ size_t const memb_len = store->members_num * sizeof(member_t);
+ size_t const rec_len = store->records_num * STORE_RECORD_SIZE;
+ size_t const buf_len = WSREP_GTID_STR_LEN + 1
+ + sizeof(uint32_t) + memb_len
+ + 1 /* read view support */
+ + sizeof(uint32_t) + rec_len;
+
+ store->snapshot = malloc(buf_len);
+
+ if (store->snapshot)
+ {
+ char* ptr = store->snapshot;
+
+ /* state GTID */
+ ret = wsrep_gtid_print(&store->gtid, ptr, buf_len);
+ if (ret > 0)
+ {
+ NODE_INFO("");
+ assert((size_t)ret < buf_len);
+
+ ptr[ret] = '\0';
+ ret++;
+ ptr += ret;
+ assert((size_t)ret < buf_len);
+
+ /* membership */
+ ptr += store_serialize_uint32(ptr, store->members_num);
+ ret += (int)sizeof(uint32_t);
+ assert((size_t)ret + memb_len < buf_len);
+ memcpy(ptr, store->members, memb_len);
+ ptr += memb_len;
+ ret += (int)memb_len;
+ assert((size_t)ret + sizeof(uint32_t) <= buf_len);
+
+ /* read view support */
+ ptr[0] = store->read_view_support;
+ ptr += 1;
+ ret += 1;
+
+ /* records */
+ ptr += store_serialize_uint32(ptr, store->records_num);
+ ret += (int)sizeof(uint32_t);
+ assert((size_t)ret + rec_len < buf_len);
+ memcpy(ptr, store->records, rec_len);
+ ret += (int)rec_len;
+ assert((size_t)ret <= buf_len);
+ }
+ else
+ {
+ NODE_ERROR("Failed to record GTID: %d (%s)", ret,strerror(-ret));
+ free(store->snapshot);
+ store->snapshot = 0;
+ }
+ }
+ else
+ {
+ NODE_ERROR("Failed to allocate snapshot buffer of size %zu",buf_len);
+ ret = -ENOMEM;
+ }
+ }
+ else
+ {
+ assert(0); /* provider should prevent such situation */
+ ret = -EAGAIN;
+ }
+
+ pthread_mutex_unlock(&store->gtid_mtx);
+
+ if (ret > 0)
+ {
+ NODE_INFO("\n\nPrepared snapshot of %u records\n\n", store->records_num);
+ *state = store->snapshot;
+ *state_len = (size_t)ret;
+ ret = 0;
+ }
+
+ return ret;
+}
+
+void
+node_store_release_state(node_store_t* const store)
+{
+ STORE_MUTEX_LOCK(&store->gtid_mtx);
+
+ assert(store->snapshot);
+ free(store->snapshot);
+ store->snapshot = 0;
+
+ pthread_mutex_unlock(&store->gtid_mtx);
+}
+
+int
+node_store_update_membership(struct node_store* const store,
+ const wsrep_view_info_t* const v)
+{
+ assert(store);
+ assert(WSREP_VIEW_PRIMARY == v->status);
+ assert(v->memb_num > 0);
+
+ STORE_MUTEX_LOCK(&store->gtid_mtx);
+
+ bool const continuation = v->state_id.seqno == store->gtid.seqno + 1 &&
+ 0 == wsrep_uuid_compare(&v->state_id.uuid, &store->gtid.uuid);
+
+ bool const initialization = WSREP_SEQNO_UNDEFINED == store->gtid.seqno &&
+ 0 == wsrep_uuid_compare(&WSREP_UUID_UNDEFINED, &store->gtid.uuid);
+
+ if (!(continuation || initialization))
+ {
+ char store_str[WSREP_GTID_STR_LEN + 1] = { 0, };
+ wsrep_gtid_print(&store->gtid, store_str, sizeof(store_str));
+ char view_str[WSREP_GTID_STR_LEN + 1] = { 0, };
+ wsrep_gtid_print(&v->state_id, view_str, sizeof(view_str));
+
+ NODE_FATAL("Attempt to initialize store GTID from incompatible view:\n"
+ "\tstore: %s\n"
+ "\tview: %s",
+ store_str, view_str);
+ abort();
+ }
+
+ wsrep_uuid_t* const new_members = calloc(sizeof(wsrep_uuid_t),
+ (size_t)v->memb_num);
+ if (!new_members)
+ {
+ NODE_FATAL("Could not allocate new members array");
+ abort();
+ }
+
+ int i;
+ for (i = 0; i < v->memb_num; i++)
+ {
+ new_members[i] = v->members[i].id;
+ }
+
+ /* REPLICATION: at this point we should compare old and new memberships and
+ * rollback all streaming transactions from the partitioned
+ * members, if any. But we don't support it in this program yet.
+ */
+
+ free(store->members);
+
+ store->members = new_members;
+ store->members_num = (uint32_t)v->memb_num;
+ store->gtid = v->state_id;
+ store->read_view_support = (v->capabilities & WSREP_CAP_SNAPSHOT);
+
+ pthread_mutex_unlock(&store->gtid_mtx);
+
+ return 0;
+}
+
+void
+node_store_gtid(struct node_store* const store,
+ wsrep_gtid_t* const gtid)
+{
+ assert(store);
+
+ STORE_MUTEX_LOCK(&store->gtid_mtx);
+
+ *gtid = store->gtid;
+
+ pthread_mutex_unlock(&store->gtid_mtx);
+}
+
+
+static inline void
+store_serialize_op(void* const buf, const struct store_trx_op* const op)
+{
+ char* ptr = buf;
+ ptr += store_record_set(ptr, 0, &op->rec_from);
+ ptr += store_record_set(ptr, 0, &op->rec_to);
+ ptr += store_serialize_uint32(ptr, op->idx_from);
+ ptr += store_serialize_uint32(ptr, op->idx_to);
+ ptr += store_serialize_uint32(ptr, op->new_value);
+ store_serialize_uint32(ptr, op->size);
+}
+
+static inline void
+store_deserialize_op(struct store_trx_op* const op, const void* const buf)
+{
+ const char* ptr = buf;
+ ptr += store_record_get(ptr, 0, &op->rec_from);
+ ptr += store_record_get(ptr, 0, &op->rec_to);
+ ptr += store_deserialize_uint32(&op->idx_from, ptr);
+ ptr += store_deserialize_uint32(&op->idx_to, ptr);
+ ptr += store_deserialize_uint32(&op->new_value, ptr);
+ store_deserialize_uint32(&op->size, ptr);
+}
+
+static inline void
+store_serialize_gtid(void* const buf, const wsrep_gtid_t* const gtid)
+{
+ char* ptr = buf;
+ memcpy(ptr, &gtid->uuid, sizeof(gtid->uuid));
+ ptr += sizeof(gtid->uuid);
+ store_serialize_int64(ptr, gtid->seqno);
+}
+
+static inline void
+store_deserialize_gtid(wsrep_gtid_t* const gtid, const void* const buf)
+{
+ const char* ptr = buf;
+ memcpy(&gtid->uuid, ptr, sizeof(gtid->uuid));
+ ptr += sizeof(gtid->uuid);
+ store_deserialize_int64(&gtid->seqno, ptr);
+}
+
+#define STORE_GTID_SIZE (sizeof(((wsrep_gtid_t*)(NULL))->uuid) + sizeof(int64_t))
+
+int
+node_store_execute(node_store_t* const store,
+ wsrep_t* const wsrep,
+ wsrep_ws_handle_t* const ws_handle)
+{
+ assert(store);
+
+ if (0 == ws_handle->trx_id)
+ {
+ assert(sizeof(ws_handle->trx_id) >= sizeof(uintptr_t));
+ ws_handle->trx_id = store_new_trx_id(store);
+ }
+
+ struct store_trx_ctx* trx = store_get_trx_ctx(store, ws_handle->trx_id);
+ if (store_trx_add_op(trx)) return -ENOMEM;
+ struct store_trx_op* const op = &trx->ops[trx->ops_num - 1];
+
+ STORE_MUTEX_LOCK(&store->gtid_mtx);
+
+ if (1 == trx->ops_num)
+ {
+ /* First operation, save ID of the read view of the transaction */
+ trx->rv_gtid = store->gtid;
+ }
+
+ /* Transaction op: copy value from one random record to another... */
+ op->idx_from = (uint32_t)rand() % store->records_num;
+ op->idx_to = (uint32_t)rand() % store->records_num;
+ store_record_get(store->records, op->idx_from, &op->rec_from);
+ store_record_get(store->records, op->idx_to, &op->rec_to);
+
+ pthread_mutex_unlock(&store->gtid_mtx);
+
+ wsrep_status_t ret = WSREP_TRX_FAIL;
+
+ if (op->rec_from.version > trx->rv_gtid.seqno ||
+ op->rec_to.version > trx->rv_gtid.seqno)
+ {
+ /* transaction read view changed, trx needs to be restarted */
+#if 0
+ NODE_INFO("Transaction read view changed: %lld -> %lld, returning %d",
+ (long long)trx->rv_gtid.seqno,
+ (long long)(op->rec_from.version > op->rec_to.version ?
+ op->rec_from.version : op->rec_to.version),
+ ret);
+#endif
+ goto error;
+ }
+
+ /* Transaction op: ... and modify it somehow, e.g. increment by 1 */
+ op->new_value = op->rec_from.value + 1;
+
+ if (1 == trx->ops_num) // first trx operation
+ {
+ /* REPLICATION: Since this application does not implement record locks,
+ * it needs to establish read view for each transaction for
+ * a proper conflict detection and transaction isolation.
+ * Otherwose we'll need to implement record versioning */
+ if (store->read_view_support)
+ {
+ ret = wsrep->assign_read_view(wsrep, ws_handle, &trx->rv_gtid);
+ if (ret)
+ {
+ NODE_ERROR("wsrep::assign_read_view(%lld) failed: %d",
+ trx->rv_gtid.seqno, ret);
+ goto error;
+ }
+ }
+
+ /* Record read view in the writeset for debugging purposes */
+ assert(store->op_size > STORE_GTID_SIZE);
+ store_serialize_gtid(trx + 1, &trx->rv_gtid);
+ wsrep_buf_t ws = { .ptr = trx + 1, .len = STORE_GTID_SIZE };
+ ret = wsrep->append_data(wsrep, ws_handle, &ws, 1, WSREP_DATA_ORDERED,
+ true);
+ if (ret)
+ {
+ NODE_ERROR("wsrep::append_data(rv_gtid) failed: %d", ret);
+ goto error;
+ }
+ }
+
+ /* REPLICATION: append keys touched by the operation
+ *
+ * NOTE: depending on data access granularity some applications may require
+ * multipart keys, e.g. <schema>:<table>:<row> in a SQL database.
+ * Single part keys match hashtables and key-value stores.
+ * Below we have two different single-part keys which reference two
+ * different records. */
+ uint32_t key_val;
+ wsrep_buf_t key_part = { .ptr = &key_val, .len = sizeof(key_val) };
+ wsrep_key_t ws_key = { .key_parts = &key_part, .key_parts_num = 1 };
+
+ /* REPLICATION: Key 1 - the key of the source, unchanged record */
+ store_serialize_uint32(&key_val, op->idx_from);
+ ret = wsrep->append_key(wsrep, ws_handle,
+ &ws_key,
+ 1, /* single key */
+ WSREP_KEY_REFERENCE,
+ true /* provider shall make a copy of the key */);
+ if (ret)
+ {
+ NODE_ERROR("wsrep::append_key(REFERENCE) failed: %d", ret);
+ goto error;
+ }
+
+ /* REPLICATION: Key 2 - the key of the record we want to update */
+ store_serialize_uint32(&key_val, op->idx_to);
+ ret = wsrep->append_key(wsrep, ws_handle,
+ &ws_key,
+ 1, /* single key */
+ WSREP_KEY_UPDATE,
+ true /* provider shall make a copy of the key */);
+ if (ret)
+ {
+ NODE_ERROR("wsrep::append_key(UPDATE) failed: %d", ret);
+ goto error;
+ }
+
+ /* REPLICATION: append transaction operation to the "writeset"
+ * (WS buffer was allocated together with trx context above) */
+ assert(store->op_size >= STORE_OP_SIZE);
+ assert(store->op_size == (uint32_t)store->op_size);
+ op->size = (uint32_t)store->op_size;
+ store_serialize_op(trx + 1, op);
+ wsrep_buf_t ws = { .ptr = trx + 1, .len = store->op_size };
+ ret = wsrep->append_data(wsrep, ws_handle, &ws, 1, WSREP_DATA_ORDERED, true);
+
+ if (!ret) return 0;
+
+ NODE_ERROR("wsrep::append_data(op) failed: %d", ret);
+
+error:
+ store_free_trx_id(store, ws_handle->trx_id);
+
+ return ret;
+}
+
+int
+node_store_apply(node_store_t* const store,
+ wsrep_trx_id_t* const trx_id,
+ const wsrep_buf_t* const ws)
+{
+ assert(store);
+ (void)store;
+
+ *trx_id = store_new_trx_id(store);
+ struct store_trx_ctx* const trx = store_get_trx_ctx(store, *trx_id);
+
+ /* prepare trx context for commit */
+ const char* ptr = ws->ptr;
+ size_t left = ws->len;
+
+ /* at least one operation should be there */
+ assert(left >= STORE_GTID_SIZE + STORE_OP_SIZE);
+
+ if (left >= STORE_GTID_SIZE)
+ {
+ store_deserialize_gtid(&trx->rv_gtid, ptr);
+ left -= STORE_GTID_SIZE;
+ ptr += STORE_GTID_SIZE;
+ }
+
+ while (left >= STORE_OP_SIZE)
+ {
+ if (store_trx_add_op(trx))
+ {
+ store_free_trx_id(store,*trx_id); /* "rollback": release resources */
+ return -ENOMEM;
+ }
+ struct store_trx_op* const op = &trx->ops[trx->ops_num - 1];
+
+ store_deserialize_op(op, ptr);
+ assert(op->idx_to <= store->records_num);
+
+ left -= op->size;
+ ptr += op->size;
+ }
+
+ if (left != 0)
+ {
+ NODE_FATAL("Failed to process last (%d/%zu) bytes of the writeset.",
+ (int)left, ws->len);
+ abort();
+ }
+
+ return 0;
+}
+
+static uint32_t const store_fnv32_seed = 2166136261;
+
+static inline uint32_t
+store_fnv32a(const void* buf, size_t const len, uint32_t seed)
+{
+ static uint32_t const fnv32_prime = 16777619;
+ const uint8_t* bp = (const uint8_t*)buf;
+ const uint8_t* const be = bp + len;
+
+ while (bp < be)
+ {
+ seed ^= *bp++;
+ seed *= fnv32_prime;
+ }
+
+ return seed;
+}
+
+
+static void
+store_checksum_state(node_store_t* store)
+{
+ uint32_t res = store_fnv32_seed;
+ uint32_t i;
+
+ for (i = 0; i < store->members_num; i++)
+ {
+ res = store_fnv32a(&store->members[i], sizeof(*store->members), res);
+ }
+
+ res = store_fnv32a(store->records, store->records_num * STORE_RECORD_SIZE,
+ res);
+
+ res = store_fnv32a(&store->gtid.uuid, sizeof(store->gtid.uuid), res);
+
+ wsrep_seqno_t s;
+ store_serialize_int64(&s, store->gtid.seqno);
+ res = store_fnv32a(&s, sizeof(s), res);
+
+ NODE_INFO("\n\n\tSeqno: %lld; state hash: %#010x\n",
+ (long long)store->gtid.seqno, res);
+}
+
+static inline void
+store_update_gtid(node_store_t* const store, const wsrep_gtid_t* ws_gtid)
+{
+ assert(0 == wsrep_uuid_compare(&store->gtid.uuid, &ws_gtid->uuid));
+
+ store->gtid.seqno++;
+
+ if (store->gtid.seqno != ws_gtid->seqno)
+ {
+ NODE_FATAL("Out of order commit: expected %lld, got %lld",
+ store->gtid.seqno, ws_gtid->seqno);
+ abort();
+ }
+
+ static wsrep_seqno_t const period = 0x000fffff; /* ~1M */
+ if (0 == (store->gtid.seqno & period))
+ {
+ store_checksum_state(store);
+ }
+}
+
+void
+node_store_commit(node_store_t* const store,
+ wsrep_trx_id_t const trx_id,
+ const wsrep_gtid_t* const ws_gtid)
+{
+ assert(store);
+ assert(trx_id);
+
+ struct store_trx_ctx* const trx = store_get_trx_ctx(store, trx_id);
+
+ bool const check_read_view_snapshot =
+#ifdef NDEBUG
+ !store->read_view_support;
+#else
+ 1;
+#endif /* NDEBUG */
+
+ STORE_MUTEX_LOCK(&store->gtid_mtx);
+
+ store_update_gtid(store, ws_gtid);
+
+ /* First loop is to check if we can commit all operations if provider
+ * does not support read view or for debugging puposes */
+ size_t i;
+ if (check_read_view_snapshot)
+ {
+ for (i = 0; i < trx->ops_num; i++)
+ {
+ struct store_trx_op* const op = &trx->ops[i];
+
+ record_t from, to;
+ store_record_get(store->records, op->idx_from, &from);
+ store_record_get(store->records, op->idx_to, &to);
+
+ if (!store_record_equal(&op->rec_from, &from) ||
+ !store_record_equal(&op->rec_to, &to))
+ {
+ /* read view changed since transaction was executed,
+ * can't commit */
+ assert(op->rec_from.version <= from.version);
+ assert(op->rec_to.version <= to.version);
+ if (op->rec_from.version == from.version)
+ assert(op->rec_from.value == from.value);
+ if (op->rec_to.version == to.version)
+ assert(op->rec_to.value == to.value);
+ if (store->read_view_support) abort();
+
+ store->read_view_fails++;
+
+ NODE_INFO("Read view changed at commit time, rollback trx");
+
+ goto error;
+ }
+ }
+ }
+
+ /* Second loop is to actually modify the dataset */
+ for (i = 0; i < trx->ops_num; i++)
+ {
+ struct store_trx_op* const op = &trx->ops[i];
+
+ record_t const new_record =
+ { .version = ws_gtid->seqno, .value = op->new_value };
+
+ store_record_set(store->records, op->idx_to, &new_record);
+ }
+
+error:
+ pthread_mutex_unlock(&store->gtid_mtx);
+
+ store_free_trx_id(store, trx_id);
+}
+
+void
+node_store_rollback(node_store_t* const store,
+ wsrep_trx_id_t const trx_id)
+{
+ assert(store);
+ assert(trx_id);
+
+ store_free_trx_id(store, trx_id);
+}
+
+void
+node_store_update_gtid(node_store_t* const store,
+ const wsrep_gtid_t* const ws_gtid)
+{
+ assert(store);
+
+ STORE_MUTEX_LOCK(&store->gtid_mtx);
+
+ store_update_gtid(store, ws_gtid);
+
+ pthread_mutex_unlock(&store->gtid_mtx);
+}
+
+long
+node_store_read_view_failures(node_store_t* const store)
+{
+ assert(store);
+
+ long ret;
+
+ STORE_MUTEX_LOCK(&store->gtid_mtx);
+
+ ret = store->read_view_fails;;
+
+ pthread_mutex_unlock(&store->gtid_mtx);
+
+ return ret;
+}
diff --git a/wsrep-lib/wsrep-API/v26/examples/node/store.h b/wsrep-lib/wsrep-API/v26/examples/node/store.h
new file mode 100644
index 00000000..51da74d7
--- /dev/null
+++ b/wsrep-lib/wsrep-API/v26/examples/node/store.h
@@ -0,0 +1,125 @@
+/* Copyright (c) 2019-2020, Codership Oy. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/**
+ * @file This unit defines simple "transactional storage engine" interface
+ */
+
+#ifndef NODE_STORE_H
+#define NODE_STORE_H
+
+#include "options.h"
+
+#include "../../wsrep_api.h"
+
+typedef struct node_store node_store_t;
+
+/**
+ * open a store and optionally assocoate a file with it */
+extern node_store_t*
+node_store_open(const struct node_options* opts);
+
+/**
+ * close store and deallocate associated resources */
+extern void
+node_store_close(node_store_t* store);
+
+/**
+ * initialize store with a state */
+extern int
+node_store_init_state(node_store_t* store, const void* state, size_t state_len);
+
+/**
+ * Return a pointer to state snapshot that is guaranteed to be unchanged
+ * until node_store_release_state() is called.
+ *
+ * @param[out] state pointer to state snapshot
+ * @param[out] state_len soze of state snapshot
+ */
+extern int
+node_store_acquire_state(node_store_t* store,
+ const void** state, size_t* state_len);
+
+/**
+ * release state */
+extern void
+node_store_release_state(node_store_t* store);
+
+/**
+ * inform store about new membership */
+extern int
+node_store_update_membership(node_store_t* store, const wsrep_view_info_t* v);
+
+/**
+ * get the current GTID (last committed) */
+extern void
+node_store_gtid(node_store_t* store, wsrep_gtid_t* gtid);
+
+/**
+ * execute and prepare local transaction in store and return its key and write
+ * set.
+ *
+ * This operation allocates resources that must be freed with either
+ * node_store_commit() or node_store_rollback()
+ *
+ * @param[in] wsrep provider handle
+ * @param[out] ws_handle reference to the resulting write set in the provider
+ */
+extern int
+node_store_execute(node_store_t* store,
+ wsrep_t* wsrep,
+ wsrep_ws_handle_t* ws_handle);
+
+/**
+ * apply and prepare foreign write set received from replication
+ *
+ * This operation allocates resources that must be freed with either
+ * node_store_commit() or node_store_rollback()
+ *
+ * @param[out] trx_id locally unique transaction ID
+ * @param[in] ws foreign transaction write set
+ */
+extern int
+node_store_apply(node_store_t* store,
+ wsrep_trx_id_t* trx_id,
+ const wsrep_buf_t* ws);
+
+/**
+ * commit prepared transaction identified by trx_id */
+extern void
+node_store_commit(node_store_t* store,
+ wsrep_trx_id_t trx_id,
+ const wsrep_gtid_t* ws_gtid);
+
+/**
+ * rollback prepared transaction identified by trx_id */
+extern void
+node_store_rollback(node_store_t* store,
+ wsrep_trx_id_t trx_id);
+
+/**
+ * update storage GTID for transactions that had to be skipped/rolled back */
+extern void
+node_store_update_gtid(node_store_t* store,
+ const wsrep_gtid_t* ws_gtid);
+
+/**
+ * @return the number of store read view snapshot check failures at commit time.
+ * (should be zero if provider implements assign_read_view() call) */
+extern long
+node_store_read_view_failures(node_store_t* store);
+
+#endif /* NODE_STORE_H */
diff --git a/wsrep-lib/wsrep-API/v26/examples/node/trx.c b/wsrep-lib/wsrep-API/v26/examples/node/trx.c
new file mode 100644
index 00000000..afdcada4
--- /dev/null
+++ b/wsrep-lib/wsrep-API/v26/examples/node/trx.c
@@ -0,0 +1,155 @@
+/* Copyright (c) 2019-2020, Codership Oy. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include "trx.h"
+#include "log.h"
+
+#include <assert.h>
+#include <errno.h> // ENOMEM, etc.
+#include <stdbool.h>
+
+wsrep_status_t
+node_trx_execute(node_store_t* const store,
+ wsrep_t* const wsrep,
+ wsrep_conn_id_t const conn_id,
+ int ops_num)
+{
+ wsrep_status_t cert = WSREP_OK; // for cleanup
+
+ static unsigned int const ws_flags =
+ WSREP_FLAG_TRX_START | WSREP_FLAG_TRX_END; // atomic trx
+ wsrep_trx_meta_t ws_meta;
+ wsrep_status_t ret = WSREP_OK;
+
+ /* prepare simple transaction and obtain a writeset handle for it */
+ wsrep_ws_handle_t ws_handle = { 0, NULL };
+ while (ops_num--)
+ {
+ if (0 != (ret = node_store_execute(store, wsrep, &ws_handle)))
+ {
+#if 0
+ NODE_INFO("master [%d]: node_store_execute() returned %d",
+ conn_id, ret);
+#endif
+ ret = WSREP_TRX_FAIL;
+ goto cleanup;
+ }
+ }
+
+ /* REPLICATION: (replicate and) certify the writeset (pointed to by
+ * ws_handle) with the cluster */
+ cert = wsrep->certify(wsrep, conn_id, &ws_handle, ws_flags, &ws_meta);
+
+ if (WSREP_BF_ABORT == cert)
+ {
+ /* REPLICATION: transaction was signaled to abort due to multi-master
+ * conflict. It must rollback immediately: it blocks
+ * transaction that was ordered earlier and will never
+ * be able to enter commit order. */
+ node_store_rollback(store, ws_handle.trx_id);
+ }
+
+ /* REPLICATION: writeset was totally ordered, need to enter commit order */
+ if (ws_meta.gtid.seqno > 0)
+ {
+ ret = wsrep->commit_order_enter(wsrep, &ws_handle, &ws_meta);
+ if (ret)
+ {
+ NODE_ERROR("master [%d]: wsrep::commit_order_enter(%lld) failed: "
+ "%d", (long long)(ws_meta.gtid.seqno), ret);
+ goto cleanup;
+ }
+
+ /* REPLICATION: inside commit monitor
+ * Note: we commit transaction only if certification succeded */
+ if (WSREP_OK == cert)
+ node_store_commit(store, ws_handle.trx_id, &ws_meta.gtid);
+ else
+ node_store_update_gtid(store, &ws_meta.gtid);
+
+ ret = wsrep->commit_order_leave(wsrep, &ws_handle, &ws_meta, NULL);
+ if (ret)
+ {
+ NODE_ERROR("master [%d]: wsrep::commit_order_leave(%lld) failed: "
+ "%d", (long long)(ws_meta.gtid.seqno), ret);
+ goto cleanup;
+ }
+ }
+ else
+ {
+ assert(cert);
+ }
+
+cleanup:
+ /* REPLICATION: if wsrep->certify() returned anything else but WSREP_OK
+ * transaction must roll back. BF aborted trx already did it. */
+ if (cert && WSREP_BF_ABORT != cert)
+ node_store_rollback(store, ws_handle.trx_id);
+
+ /* NOTE: this application follows the approach that resources must be freed
+ * at the same level where they were allocated, so it is assumed that
+ * ws_key and ws were deallocated in either commit or rollback calls.*/
+
+ /* REPLICATION: release provider resources associated with the trx */
+ wsrep->release(wsrep, &ws_handle);
+
+ return ret ? ret : cert;
+}
+
+wsrep_status_t
+node_trx_apply(node_store_t* const store,
+ wsrep_t* const wsrep,
+ const wsrep_ws_handle_t* const ws_handle,
+ const wsrep_trx_meta_t* const ws_meta,
+ const wsrep_buf_t* const ws)
+{
+ /* no business being here if event was not ordered */
+ assert(ws_meta->gtid.seqno > 0);
+
+ wsrep_trx_id_t trx_id;
+ wsrep_buf_t err_buf = { NULL, 0 };
+ int app_err;
+ if (ws)
+ {
+ app_err = node_store_apply(store, &trx_id, ws);
+ if (app_err)
+ {
+ /* REPLICATION: if applying failed, prepare an error buffer with
+ * sufficient error specification */
+ err_buf.ptr = &app_err; // suppose error code is enough
+ err_buf.len = sizeof(app_err);
+ }
+ }
+ else /* ws failed certification and should be skipped */
+ {
+ /* just some non-0 code to choose node_store_update_gtid() below */
+ app_err = 1;
+ }
+
+ wsrep_status_t ret;
+ ret = wsrep->commit_order_enter(wsrep, ws_handle, ws_meta);
+ if (ret) {
+ node_store_rollback(store, trx_id);
+ return ret;
+ }
+
+ if (!app_err) node_store_commit(store, trx_id, &ws_meta->gtid);
+ else node_store_update_gtid(store, &ws_meta->gtid);
+
+ ret = wsrep->commit_order_leave(wsrep, ws_handle, ws_meta, &err_buf);
+
+ return ret;
+}
diff --git a/wsrep-lib/wsrep-API/v26/examples/node/trx.h b/wsrep-lib/wsrep-API/v26/examples/node/trx.h
new file mode 100644
index 00000000..e1d763a1
--- /dev/null
+++ b/wsrep-lib/wsrep-API/v26/examples/node/trx.h
@@ -0,0 +1,50 @@
+/* Copyright (c) 2019-2020, Codership Oy. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/**
+ * @file This unit defines "transaction" interface
+ */
+
+#ifndef NODE_TRX_H
+#define NODE_TRX_H
+
+#include "store.h"
+
+#include "../../wsrep_api.h"
+
+/**
+ * executes and replicates local transaction
+ */
+extern wsrep_status_t
+node_trx_execute(node_store_t* store,
+ wsrep_t* wsrep,
+ wsrep_conn_id_t conn_id,
+ int ops_num);
+
+/**
+ * applies and commits slave write set
+ *
+ * @param ws replicated event writeset. NULL if it failed certification (and so
+ * must be skipped, but it was ordered, so store GTID must be updated)
+ */
+extern wsrep_status_t
+node_trx_apply(node_store_t* store,
+ wsrep_t* wsrep,
+ const wsrep_ws_handle_t* ws_handle,
+ const wsrep_trx_meta_t* ws_meta,
+ const wsrep_buf_t* ws);
+
+#endif /* NODE_TRX_H */
diff --git a/wsrep-lib/wsrep-API/v26/examples/node/worker.c b/wsrep-lib/wsrep-API/v26/examples/node/worker.c
new file mode 100644
index 00000000..e9901ad8
--- /dev/null
+++ b/wsrep-lib/wsrep-API/v26/examples/node/worker.c
@@ -0,0 +1,197 @@
+/* Copyright (c) 2019-2020, Codership Oy. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include "worker.h"
+
+#include "log.h"
+#include "options.h"
+#include "trx.h"
+#include "wsrep.h"
+
+#include <assert.h>
+#include <pthread.h>
+#include <stdbool.h>
+#include <string.h> // strerror()
+
+struct node_worker
+{
+ struct node_ctx* node;
+ pthread_t thread_id;
+ size_t id;
+ bool exit;
+};
+
+enum wsrep_cb_status
+node_worker_apply_cb(void* const recv_ctx,
+ const wsrep_ws_handle_t* const ws_handle,
+ uint32_t const ws_flags,
+ const wsrep_buf_t* const ws,
+ const wsrep_trx_meta_t* const ws_meta,
+ wsrep_bool_t* const exit_loop)
+{
+ assert(recv_ctx);
+
+ struct node_worker* const worker = recv_ctx;
+
+ wsrep_status_t const ret = node_trx_apply(
+ worker->node->store,
+ node_wsrep_provider(worker->node->wsrep),
+ ws_handle,
+ ws_meta,
+ ws_flags & WSREP_FLAG_ROLLBACK ? NULL : ws);
+
+ *exit_loop = worker->exit;
+
+ return WSREP_OK == ret ? WSREP_CB_SUCCESS : WSREP_CB_FAILURE;
+}
+
+
+static void*
+worker_slave(void* recv_ctx)
+{
+ struct node_worker* const worker = recv_ctx;
+ wsrep_t* const wsrep = node_wsrep_provider(worker->node->wsrep);
+
+ wsrep_status_t const ret = wsrep->recv(wsrep, worker);
+
+ if (WSREP_OK != ret)
+ {
+ NODE_ERROR("slave worker [%zu] exited with error %d.", worker->id, ret);
+ }
+
+ return NULL;
+}
+
+static void*
+worker_master(void* send_ctx)
+{
+ struct node_worker* const worker = send_ctx;
+ struct node_ctx* const node = worker->node;
+ wsrep_t* const wsrep = node_wsrep_provider(node->wsrep);
+
+ assert(node->opts->ws_size > 0);
+
+ wsrep_status_t ret;
+
+ do
+ {
+ /* REPLICATION: we should not perform any local writes until the node
+ * is synced with the cluster. */
+ if (!node_wsrep_wait_synced(node->wsrep))
+ {
+ NODE_ERROR("master worker [%zu] failed waiting for SYNCED state.",
+ worker->id);
+ break;
+ }
+
+ /* REPLICATION: the node is now synced */
+
+ do
+ {
+ ret = node_trx_execute(node->store,
+ wsrep,
+ worker->id,
+ (int)node->opts->operations);
+ }
+ while(WSREP_OK == ret // success
+ || (WSREP_TRX_FAIL == ret // certification failed, trx rolled back
+ && (usleep(10000),true)) // retry after short sleep
+ );
+ }
+ while (WSREP_CONN_FAIL == ret); // provider in bad state (e.g. non-Primary)
+
+ return NULL;
+}
+
+struct node_worker_pool
+{
+ size_t size; // size of the pool (nu,ber of nodes)
+ struct node_worker worker[1]; // worker context array;
+};
+
+struct node_worker_pool*
+node_worker_start(struct node_ctx* const ctx,
+ node_worker_type_t const type,
+ size_t const size)
+{
+ assert(ctx);
+
+ if (0 == size) return NULL;
+
+ const char* const type_str = type == NODE_WORKER_SLAVE ? "slave" : "master";
+
+ size_t const alloc_size =
+ sizeof(struct node_worker_pool) +
+ sizeof(struct node_worker) * (size - 1);
+
+ struct node_worker_pool* const ret = malloc(alloc_size);
+
+ if (ret)
+ {
+ void* (* const routine) (void*) =
+ type == NODE_WORKER_SLAVE ? worker_slave : worker_master;
+
+ size_t i;
+ for (i = 0; i < size; i++)
+ {
+ struct node_worker* const worker = &ret->worker[i];
+ worker->node = ctx;
+ worker->id = i;
+ worker->exit = false;
+
+ int const err = pthread_create(&worker->thread_id,
+ NULL,
+ routine,
+ worker);
+ if (err)
+ {
+ NODE_ERROR("Failed to start %s worker[%zu]: %d (%s)",
+ type_str, i, err, strerror(err));
+ if (0 == i)
+ {
+ free(ret);
+ return NULL;
+ }
+ else
+ {
+ break; // some threads have started,
+ // need to return to close them first
+ }
+ }
+ }
+
+ ret->size = i;
+ }
+ else
+ {
+ NODE_ERROR("Failed to allocate %zu bytes for the %s worker pool",
+ alloc_size, type_str);
+ }
+
+ return ret;
+}
+
+void
+node_worker_stop(struct node_worker_pool* pool)
+{
+ size_t i;
+ for (i = 0; pool && i < pool->size; i++)
+ {
+ pthread_join(pool->worker[i].thread_id, NULL);
+ }
+
+ free(pool);
+}
diff --git a/wsrep-lib/wsrep-API/v26/examples/node/worker.h b/wsrep-lib/wsrep-API/v26/examples/node/worker.h
new file mode 100644
index 00000000..7ae06423
--- /dev/null
+++ b/wsrep-lib/wsrep-API/v26/examples/node/worker.h
@@ -0,0 +1,66 @@
+/* Copyright (c) 2019, Codership Oy. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/**
+ * @file This unit defines worker thread interface
+ */
+
+#ifndef NODE_WORKER_H
+#define NODE_WORKER_H
+
+#include "ctx.h"
+
+#include "../../wsrep_api.h"
+
+/**
+ * REPLICATION: a callback to apply and commit slave replication events */
+extern enum wsrep_cb_status
+node_worker_apply_cb(void* recv_ctx,
+ const wsrep_ws_handle_t* ws_handle,
+ uint32_t ws_flags,
+ const wsrep_buf_t* ws,
+ const wsrep_trx_meta_t* ws_meta,
+ wsrep_bool_t* exit_loop);
+
+typedef enum node_worker_type
+{
+ NODE_WORKER_SLAVE,
+ NODE_WORKER_MASTER
+}
+ node_worker_type_t;
+
+struct node_worker_pool;
+
+/**
+ * Starts the required number of workier threads of a given type
+ *
+ * @param[in] ctx application context
+ * @param[in] type of a worker
+ * @param[in] number of workers
+ *
+ * @return worker pool handle
+ */
+extern struct node_worker_pool*
+node_worker_start(struct node_ctx* ctx,
+ node_worker_type_t type,
+ size_t number);
+
+/**
+ * Stops workers in a pool and deallocates respective resources */
+extern void
+node_worker_stop(struct node_worker_pool* pool);
+
+#endif /* NODE_WORKER_H */
diff --git a/wsrep-lib/wsrep-API/v26/examples/node/wsrep.c b/wsrep-lib/wsrep-API/v26/examples/node/wsrep.c
new file mode 100644
index 00000000..6cea6d90
--- /dev/null
+++ b/wsrep-lib/wsrep-API/v26/examples/node/wsrep.c
@@ -0,0 +1,479 @@
+/* Copyright (c) 2019, Codership Oy. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include "wsrep.h"
+
+#include "log.h"
+#include "sst.h"
+#include "store.h"
+#include "worker.h"
+
+#include <assert.h>
+#include <stdio.h> // snprintf()
+#include <stdlib.h> // abort()
+#include <string.h> // strcasecmp()
+
+struct node_wsrep
+{
+ wsrep_t* instance; // wsrep provider instance
+
+ struct wsrep_view
+ {
+ pthread_mutex_t mtx;
+ wsrep_gtid_t state_id;
+ wsrep_view_status_t status;
+ wsrep_cap_t capabilities;
+ int proto_ver;
+ int memb_num;
+ int my_idx;
+ wsrep_member_info_t* members;
+ }
+ view;
+
+ struct
+ {
+ pthread_mutex_t mtx;
+ pthread_cond_t cond;
+ int value;
+ }
+ synced;
+
+ bool bootstrap; // shall this node bootstrap a primary view?
+};
+
+static struct node_wsrep s_wsrep =
+{
+ .instance = NULL,
+ .view =
+ {
+ .mtx = PTHREAD_MUTEX_INITIALIZER,
+ .state_id = {{{ 0, }}, WSREP_SEQNO_UNDEFINED },
+ .status = WSREP_VIEW_DISCONNECTED,
+ .capabilities = 0,
+ .proto_ver = -1,
+ .memb_num = 0,
+ .my_idx = -1,
+ .members = NULL
+ },
+ .synced =
+ {
+ .mtx = PTHREAD_MUTEX_INITIALIZER,
+ .cond = PTHREAD_COND_INITIALIZER,
+ .value = 0
+ },
+ .bootstrap = false
+};
+
+static const char* wsrep_view_status_str[WSREP_VIEW_MAX] =
+{
+ "PRIMARY",
+ "NON-PRIMARY",
+ "DISCONNECTED"
+};
+
+#define WSREP_CAPABILITIES_MAX ((int)sizeof(wsrep_cap_t) * 8) // bitmask
+static const char* wsrep_capabilities_str[WSREP_CAPABILITIES_MAX] =
+{
+ "MULTI-MASTER",
+ "CERTIFICATION",
+ "PA",
+ "REPLAY",
+ "TOI",
+ "PAUSE",
+ "CAUSAL-READS",
+ "CAUSAL-TRX",
+ "INCREMENTAL",
+ "SESSION-LOCKS",
+ "DISTRIBUTED-LOCKS",
+ "CONSISTENCY-CHECK",
+ "UNORDERED",
+ "ANNOTATION",
+ "PREORDERED",
+ "STREAMING",
+ "SNAPSHOT",
+ "NBO",
+ NULL,
+};
+
+/**
+ * REPLICATION: callback is called by provider when the node connects to group.
+ * This happens out-of-order, before the node receives a state
+ * transfer and syncs with the cluster. Unless application requires
+ * it it can be empty. We however want to know the GTID of the
+ * group out of order for SST tricks, so we record it out of order.
+ */
+static enum wsrep_cb_status
+wsrep_connected_cb(void* const x,
+ const wsrep_view_info_t* const v)
+{
+ char gtid_str[WSREP_GTID_STR_LEN + 1];
+ wsrep_gtid_print(&v->state_id, gtid_str, sizeof(gtid_str));
+
+ NODE_INFO("connect_cb(): Connected at %s to %s group of %d member(s)",
+ gtid_str, wsrep_view_status_str[v->status], v->memb_num);
+
+ struct node_wsrep* const wsrep = ((struct node_ctx*)x)->wsrep;
+
+ if (pthread_mutex_lock(&wsrep->view.mtx))
+ {
+ NODE_FATAL("Failed to lock VIEW mutex");
+ abort();
+ }
+
+ wsrep->view.state_id = v->state_id;
+
+ pthread_mutex_unlock(&wsrep->view.mtx);
+
+ return WSREP_CB_SUCCESS;
+}
+
+/**
+ * logs view data */
+static void
+wsrep_log_view(const struct wsrep_view* v)
+{
+ char gtid[WSREP_GTID_STR_LEN + 1];
+ wsrep_gtid_print(&v->state_id, gtid, sizeof(gtid));
+ gtid[WSREP_GTID_STR_LEN] = '\0';
+
+ char caps[256];
+ int written = 0;
+ size_t space_left = sizeof(caps);
+ int i;
+ for (i = 0; i < WSREP_CAPABILITIES_MAX && space_left > 0; i++)
+ {
+ wsrep_cap_t const f = 1u << i;
+
+ if (!(f & v->capabilities)) continue;
+
+ if (wsrep_capabilities_str[i])
+ {
+ written += snprintf(&caps[written], space_left, "%s|",
+ wsrep_capabilities_str[i]);
+ }
+ else
+ {
+ written += snprintf(&caps[written], space_left, "%d|", i);
+ }
+
+ space_left = sizeof(caps) - (size_t)written;
+ }
+ caps[written ? written - 1 : 0] = '\0'; // overwrite last '|'
+
+ char members_list[1024];
+ written = 0;
+ space_left = sizeof(members_list);
+ for (i = 0; i < v->memb_num && space_left > 0; i++)
+ {
+ wsrep_member_info_t* m = &v->members[i];
+ char uuid[WSREP_UUID_STR_LEN + 1];
+ wsrep_uuid_print(&m->id, uuid, sizeof(uuid));
+ uuid[WSREP_UUID_STR_LEN] = '\0';
+
+ written += snprintf(&members_list[written], space_left,
+ "%s%d: %s '%s' incoming:'%s'\n",
+ v->my_idx == i ? " * " : " ", i,
+ uuid, m->name, m->incoming);
+
+ space_left = sizeof(members_list) - (size_t)written;
+ }
+ members_list[written ? written - 1 : 0] = '\0'; // overwrite the last '\n'
+
+ NODE_INFO(
+ "New view received:\n"
+ "state: %s (%s)\n"
+ "capabilities: %s\n"
+ "protocol version: %d\n"
+ "members(%d)%s%s",
+ gtid, wsrep_view_status_str[v->status],
+ caps,
+ v->proto_ver,
+ v->memb_num, v->memb_num ? ":\n" : "", members_list);
+}
+
+/**
+ * REPLICATION: callback is called when the node needs to process cluster
+ * view change. The callback is called in "total order isolation",
+ * so all the preceding replication events will be processed
+ * strictly before the call and all subsequent - striclty after.
+ */
+static enum wsrep_cb_status
+wsrep_view_cb(void* const x,
+ void* const r,
+ const wsrep_view_info_t* const v,
+ const char* const state,
+ size_t const state_len)
+{
+ (void)r;
+ (void)state;
+ (void)state_len;
+
+ struct node_ctx* const node = x;
+
+ if (WSREP_VIEW_PRIMARY == v->status)
+ {
+ /* REPLICATION: membership change is a totally ordered event and as such
+ * should be a part of the state, like changes to the
+ * database. */
+ int err = node_store_update_membership(node->store, v);
+ if (err)
+ {
+ NODE_FATAL("Failed to update membership in store: %d (%s)",
+ err, strerror(-err));
+ abort();
+ }
+ }
+
+ enum wsrep_cb_status ret = WSREP_CB_SUCCESS;
+ struct node_wsrep* const wsrep = ((struct node_ctx*)x)->wsrep;
+
+ if (pthread_mutex_lock(&wsrep->view.mtx))
+ {
+ NODE_FATAL("Failed to lock VIEW mutex");
+ abort();
+ }
+
+ /* below we'll just copy the data for future reference (if need be): */
+
+ size_t const memb_size = (size_t)v->memb_num * sizeof(wsrep_member_info_t);
+ void* const tmp = realloc(wsrep->view.members, memb_size);
+ if (memb_size > 0 && !tmp)
+ {
+ NODE_ERROR("Could not allocate memory for a new view: %zu bytes",
+ memb_size);
+ ret = WSREP_CB_FAILURE;
+ goto cleanup;
+ }
+ else
+ {
+ wsrep->view.members = tmp;
+ if (memb_size) memcpy(wsrep->view.members, &v->members[0], memb_size);
+ }
+
+ wsrep->view.state_id = v->state_id;
+ wsrep->view.status = v->status;
+ wsrep->view.capabilities = v->capabilities;
+ wsrep->view.proto_ver = v->proto_ver;
+ wsrep->view.memb_num = v->memb_num;
+ wsrep->view.my_idx = v->my_idx;
+
+ /* and now log the info */
+
+ wsrep_log_view(&wsrep->view);
+
+cleanup:
+ pthread_mutex_unlock(&wsrep->view.mtx);
+
+ return ret;
+}
+
+/**
+ * REPLICATION: callback is called by provider when the node becomes SYNCED */
+static enum wsrep_cb_status
+wsrep_synced_cb(void* const x)
+{
+ struct node_wsrep* const wsrep = ((struct node_ctx*)x)->wsrep;
+
+ if (pthread_mutex_lock(&wsrep->synced.mtx))
+ {
+ NODE_FATAL("Failed to lock SYNCED mutex");
+ abort();
+ }
+
+ if (wsrep->synced.value == 0)
+ {
+ NODE_INFO("become SYNCED");
+ wsrep->synced.value = 1;
+ pthread_cond_broadcast(&wsrep->synced.cond);
+ }
+
+ pthread_mutex_unlock(&wsrep->synced.mtx);
+
+ return WSREP_CB_SUCCESS;
+}
+
+struct node_wsrep*
+node_wsrep_init(const struct node_options* const opts,
+ const wsrep_gtid_t* const current_gtid,
+ void* const app_ctx)
+{
+ if (s_wsrep.instance != NULL) return NULL; // already initialized
+
+ wsrep_status_t err;
+ err = wsrep_load(opts->provider, &s_wsrep.instance, node_log_cb);
+ if (WSREP_OK != err)
+ {
+ if (strcasecmp(opts->provider, WSREP_NONE))
+ {
+ NODE_ERROR("wsrep_load(%s) failed: %s (%d).",
+ opts->provider, strerror(err), err);
+ }
+ else
+ {
+ NODE_ERROR("Initializing dummy provider failed: %s (%d).",
+ strerror(err), err);
+ }
+ return NULL;
+ }
+
+ char base_addr[256];
+ snprintf(base_addr, sizeof(base_addr) - 1, "%s:%ld",
+ opts->base_host, opts->base_port);
+
+ struct wsrep_init_args args =
+ {
+ .app_ctx = app_ctx,
+
+ .node_name = opts->name,
+ .node_address = base_addr,
+ .node_incoming = "", // we don't accept client connections
+ .data_dir = opts->data_dir,
+ .options = opts->options,
+ .proto_ver = 0, // this is the first version of the application
+ // so the first version of the writeset protocol
+ .state_id = current_gtid,
+ .state = NULL, // unused
+
+ .logger_cb = node_log_cb,
+ .connected_cb = wsrep_connected_cb,
+ .view_cb = wsrep_view_cb,
+ .synced_cb = wsrep_synced_cb,
+ .encrypt_cb = NULL, // not implemented ATM
+
+ .apply_cb = node_worker_apply_cb,
+ .unordered_cb = NULL, // not needed now
+
+ .sst_request_cb = node_sst_request_cb,
+ .sst_donate_cb = node_sst_donate_cb
+ };
+
+ wsrep_t* wsrep = s_wsrep.instance;
+
+ err = wsrep->init(wsrep, &args);
+
+ if (WSREP_OK != err)
+ {
+ NODE_ERROR("wsrep::init() failed: %d, must shutdown", err);
+ node_wsrep_close(&s_wsrep);
+ return NULL;
+ }
+
+ return &s_wsrep;
+}
+
+wsrep_status_t
+node_wsrep_connect(struct node_wsrep* const wsrep,
+ const char* const address,
+ bool const bootstrap)
+{
+ wsrep->bootstrap = bootstrap;
+ wsrep_status_t err = wsrep->instance->connect(wsrep->instance,
+ "wsrep_cluster",
+ address,
+ NULL,
+ wsrep->bootstrap);
+
+ if (WSREP_OK != err)
+ {
+ NODE_ERROR("wsrep::connect(%s) failed: %d, must shutdown",
+ address, err);
+ node_wsrep_close(wsrep);
+ }
+
+ return err;
+}
+
+void
+node_wsrep_disconnect(struct node_wsrep* const wsrep)
+{
+ if (pthread_mutex_lock(&wsrep->synced.mtx))
+ {
+ NODE_FATAL("Failed to lock SYNCED mutex");
+ abort();
+ }
+ wsrep->synced.value = -1; /* this will signal master threads to exit */
+ pthread_cond_broadcast(&wsrep->synced.cond);
+ pthread_mutex_unlock(&wsrep->synced.mtx);
+
+ wsrep_status_t const err = wsrep->instance->disconnect(wsrep->instance);
+
+ if (err)
+ {
+ /* REPLICATION: unless connection is not closed, slave threads will
+ * never return. */
+ NODE_FATAL("Failed to close wsrep connection: %d", err);
+ abort();
+ }
+}
+
+void
+node_wsrep_close(struct node_wsrep* const wsrep)
+{
+ if (pthread_mutex_lock(&wsrep->view.mtx))
+ {
+ NODE_FATAL("Failed to lock VIEW mutex");
+ abort();
+ }
+ assert(0 == wsrep->view.memb_num); // the node must be disconneted
+ assert(NULL == wsrep->view.members);
+ free(wsrep->view.members);
+ wsrep->view.members = NULL;
+ pthread_mutex_unlock(&wsrep->view.mtx);
+
+ wsrep->instance->free(wsrep->instance);
+ wsrep->instance = NULL;
+}
+
+bool
+node_wsrep_wait_synced(struct node_wsrep* const wsrep)
+{
+ if (pthread_mutex_lock(&wsrep->synced.mtx))
+ {
+ NODE_FATAL("Failed to lock SYNCED mutex");
+ abort();
+ }
+
+ while (wsrep->synced.value == 0)
+ {
+ pthread_cond_wait(&wsrep->synced.cond, &wsrep->synced.mtx);
+ }
+
+ bool const ret = wsrep->synced.value > 0;
+
+ pthread_mutex_unlock(&wsrep->synced.mtx);
+
+ return ret;
+}
+
+void
+node_wsrep_connected_gtid(struct node_wsrep* wsrep, wsrep_gtid_t* gtid)
+{
+ if (pthread_mutex_lock(&wsrep->view.mtx))
+ {
+ NODE_FATAL("Failed to lock VIEW mutex");
+ abort();
+ }
+
+ *gtid = wsrep->view.state_id;
+
+ pthread_mutex_unlock(&wsrep->view.mtx);
+}
+
+wsrep_t*
+node_wsrep_provider(struct node_wsrep* wsrep)
+{
+ return wsrep->instance;
+}
diff --git a/wsrep-lib/wsrep-API/v26/examples/node/wsrep.h b/wsrep-lib/wsrep-API/v26/examples/node/wsrep.h
new file mode 100644
index 00000000..75c7eac3
--- /dev/null
+++ b/wsrep-lib/wsrep-API/v26/examples/node/wsrep.h
@@ -0,0 +1,92 @@
+/* Copyright (c) 2019, Codership Oy. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/**
+ * @file This unit defines various helpers to manage wsrep provider
+ */
+
+#ifndef NODE_WSREP_H
+#define NODE_WSREP_H
+
+#include "options.h"
+
+#include "../../wsrep_api.h"
+
+#include <pthread.h>
+#include <stdbool.h>
+
+typedef struct node_wsrep node_wsrep_t;
+
+/**
+ * loads and initializes wsrep provider for further usage
+ *
+ * @param[in] opts program options
+ * @param[in] current_gtid GTID corresponding to the current node state
+ * @param[in] app_ctx application context to be passed to callbacks
+ *
+ * @return initialized object pointer
+ */
+extern node_wsrep_t*
+node_wsrep_init(const struct node_options* opts,
+ const wsrep_gtid_t* current_gtid,
+ void* app_ctx);
+
+/**
+ * connects to primary component
+ *
+ * @param[in] wsrep wsrep context
+ * @param[in] address address to connect at (provider specific)
+ * @param[in] bootsstrap bootstrap primary component if there's none
+ *
+ * @return wsrep status code
+ */
+extern wsrep_status_t
+node_wsrep_connect(node_wsrep_t* wsrep,
+ const char* address,
+ bool bootstrap);
+
+/**
+ * disconnects from primary component
+ */
+extern void
+node_wsrep_disconnect(node_wsrep_t* wsrep);
+
+/**
+ * deinitializes and unloads wsrep provider
+ */
+extern void
+node_wsrep_close(node_wsrep_t* wsrep);
+
+/**
+ * waits for the node to become SYNCED
+ *
+ * @return true if node is synced, false in any other event.
+ */
+extern bool
+node_wsrep_wait_synced(node_wsrep_t* wsrep);
+
+/**
+ * @param[in] wsrep context
+ * @param[out] gtid of the current view */
+extern void
+node_wsrep_connected_gtid(node_wsrep_t* wsrep, wsrep_gtid_t* gtid);
+
+/**
+ * @return wsrep provider instance */
+extern wsrep_t*
+node_wsrep_provider(node_wsrep_t* wsrep);
+
+#endif /* NODE_WSREP_H */
diff --git a/wsrep-lib/wsrep-API/v26/wsrep.xcf b/wsrep-lib/wsrep-API/v26/wsrep.xcf
new file mode 100644
index 00000000..54108c6b
--- /dev/null
+++ b/wsrep-lib/wsrep-API/v26/wsrep.xcf
Binary files differ
diff --git a/wsrep-lib/wsrep-API/v26/wsrep_allowlist_service.h b/wsrep-lib/wsrep-API/v26/wsrep_allowlist_service.h
new file mode 100644
index 00000000..71f4d7e9
--- /dev/null
+++ b/wsrep-lib/wsrep-API/v26/wsrep_allowlist_service.h
@@ -0,0 +1,100 @@
+/*
+ * Copyright (C) 2021 Codership Oy <info@codership.com>
+ *
+ * This file is part of wsrep-API.
+ *
+ * Wsrep-API is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * Wsrep-API is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with wsrep-API. If not, see <https://www.gnu.org/licenses/>.
+ */
+
+/** @file wsrep_allowlist_service.h
+ *
+ * This file defines interface for connection allowlist checks.
+ *
+ * The provider which is capable of using the service interface v1 must
+ * export the following functions.
+ *
+ * int wsrep_init_allowlist_service_v1(wsrep_allowlist_service_v1_t*)
+ * void wsrep_deinit_allowlist_service_v1()
+ *
+ * which can be probed by the application.
+ *
+ * The application must initialize the service via above init function
+ * before the provider is initialized via wsrep->init(). The deinit
+ * function must be called after the provider side resources have been
+ * released via wsrep->free().
+ */
+
+#ifndef WSREP_ALLOWLIST_SERVICE_H
+#define WSREP_ALLOWLIST_SERVICE_H
+
+#include "wsrep_api.h"
+
+#ifdef __cplusplus
+extern "C"
+{
+#endif /* __cplusplus */
+
+/**
+ * Type tag for application defined allowlist processing context.
+ *
+ * Application may pass pointer to the context when initializing
+ * the allowlist service. This pointer is passed a first parameter for
+ * each service call.
+ */
+typedef struct wsrep_allowlist_context wsrep_allowlist_context_t;
+
+typedef enum
+{
+ WSREP_ALLOWLIST_KEY_IP = 0, // IP allowlist check
+ WSREP_ALLOWLIST_KEY_SSL // SSL certificate allowlist check
+} wsrep_allowlist_key_t;
+
+/*
+ * Allowlist connection check callback.
+ *
+ * @retval WSREP_OK connection allowed
+ * @retval WSREP_NOT_ALLOWED connection not allowed
+ */
+typedef wsrep_status_t (*wsrep_allowlist_cb_t)(
+ wsrep_allowlist_context_t*,
+ wsrep_allowlist_key_t key,
+ const wsrep_buf_t* value);
+
+/**
+ * Allowlist service struct.
+ *
+ * A pointer to this struct must be passed to the call to
+ * wsrep_init_allowlist_service_v1.
+ *
+ * The application must provide implementation to all functions defined
+ * in this struct.
+ */
+typedef struct wsrep_allowlist_service_v1_st
+{
+ /* Allowlist check callback */
+ wsrep_allowlist_cb_t allowlist_cb;
+ /* Pointer to application defined allowlist context. */
+ wsrep_allowlist_context_t* context;
+} wsrep_allowlist_service_v1_t;
+
+#ifdef __cplusplus
+}
+#endif /* __cplusplus */
+
+
+#define WSREP_ALLOWLIST_SERVICE_INIT_FUNC_V1 "wsrep_init_allowlist_service_v1"
+#define WSREP_ALLOWLIST_SERVICE_DEINIT_FUNC_V1 "wsrep_deinit_allowlist_service_v1"
+
+#endif /* WSREP_ALLOWLIST_SERVICE_H */
+
diff --git a/wsrep-lib/wsrep-API/v26/wsrep_api.h b/wsrep-lib/wsrep-API/v26/wsrep_api.h
new file mode 100644
index 00000000..59bb71da
--- /dev/null
+++ b/wsrep-lib/wsrep-API/v26/wsrep_api.h
@@ -0,0 +1,1380 @@
+/* Copyright (C) 2009-2013 Codership Oy <info@codership.com>
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; version 2 of the License.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License along
+ with this program; if not, write to the Free Software Foundation, Inc.,
+ 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+/*!
+ @file wsrep API declaration.
+
+ HOW TO READ THIS FILE.
+
+ Due to C language rules this header layout doesn't lend itself to intuitive
+ reading. So here's the scoop: in the end this header declares two main types:
+
+ * struct wsrep_init_args
+
+ and
+
+ * struct wsrep
+
+ wsrep_init_args contains initialization parameters for wsrep provider like
+ names, addresses, etc. and pointers to callbacks. The callbacks will be called
+ by provider when it needs to do something application-specific, like log a
+ message or apply a writeset. It should be passed to init() call from
+ wsrep API. It is an application part of wsrep API contract.
+
+ struct wsrep is the interface to wsrep provider. It contains all wsrep API
+ calls. It is a provider part of wsrep API contract.
+
+ Finally, wsrep_load() method loads (dlopens) wsrep provider library. It is
+ defined in wsrep_loader.c unit and is part of libwsrep.a (which is not a
+ wsrep provider, but a convenience library).
+
+ wsrep_unload() does the reverse.
+
+*/
+#ifndef WSREP_H
+#define WSREP_H
+
+#include <stdint.h>
+#include <stdbool.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <time.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**************************************************************************
+ * *
+ * wsrep replication API *
+ * *
+ **************************************************************************/
+
+#define WSREP_INTERFACE_VERSION "26"
+
+/*! Empty backend spec */
+#define WSREP_NONE "none"
+
+
+/*!
+ * @brief log severity levels, passed as first argument to log handler
+ */
+typedef enum wsrep_log_level
+{
+ WSREP_LOG_FATAL, //!< Unrecoverable error, application must quit.
+ WSREP_LOG_ERROR, //!< Operation failed, must be repeated.
+ WSREP_LOG_WARN, //!< Unexpected condition, but no operational failure.
+ WSREP_LOG_INFO, //!< Informational message.
+ WSREP_LOG_DEBUG //!< Debug message. Shows only of compiled with debug.
+} wsrep_log_level_t;
+
+/*!
+ * @brief error log handler
+ *
+ * All messages from wsrep provider are directed to this
+ * handler, if present.
+ *
+ * @param level log level
+ * @param message log message
+ */
+typedef void (*wsrep_log_cb_t)(wsrep_log_level_t, const char *);
+
+
+/*!
+ * Certain provider capabilities application may want to know about
+ */
+#define WSREP_CAP_MULTI_MASTER ( 1ULL << 0 )
+#define WSREP_CAP_CERTIFICATION ( 1ULL << 1 )
+#define WSREP_CAP_PARALLEL_APPLYING ( 1ULL << 2 )
+#define WSREP_CAP_TRX_REPLAY ( 1ULL << 3 )
+#define WSREP_CAP_ISOLATION ( 1ULL << 4 )
+#define WSREP_CAP_PAUSE ( 1ULL << 5 )
+#define WSREP_CAP_CAUSAL_READS ( 1ULL << 6 )
+#define WSREP_CAP_CAUSAL_TRX ( 1ULL << 7 )
+#define WSREP_CAP_INCREMENTAL_WRITESET ( 1ULL << 8 )
+#define WSREP_CAP_SESSION_LOCKS ( 1ULL << 9 )
+#define WSREP_CAP_DISTRIBUTED_LOCKS ( 1ULL << 10 )
+#define WSREP_CAP_CONSISTENCY_CHECK ( 1ULL << 11 )
+#define WSREP_CAP_UNORDERED ( 1ULL << 12 )
+#define WSREP_CAP_ANNOTATION ( 1ULL << 13 )
+#define WSREP_CAP_PREORDERED ( 1ULL << 14 )
+#define WSREP_CAP_STREAMING ( 1ULL << 15 )
+#define WSREP_CAP_SNAPSHOT ( 1ULL << 16 )
+#define WSREP_CAP_NBO ( 1ULL << 17 )
+
+typedef uint32_t wsrep_cap_t; //!< capabilities bitmask
+
+/*!
+ * Writeset flags
+ *
+ * TRX_END the writeset and all preceding writesets must be committed
+ * ROLLBACK all preceding writesets in a transaction must be rolled back
+ * ISOLATION the writeset must be applied AND committed in isolation
+ * PA_UNSAFE the writeset cannot be applied in parallel
+ * COMMUTATIVE the order in which the writeset is applied does not matter
+ * NATIVE the writeset contains another writeset in this provider format
+ *
+ * TRX_START shall be set on the first trx fragment by provider
+ * TRX_PREPARE shall be set on the fragment which prepares the transaction
+ *
+ * Note that some of the flags are mutually exclusive (e.g. TRX_END and
+ * ROLLBACK).
+ */
+#define WSREP_FLAG_TRX_END ( 1ULL << 0 )
+#define WSREP_FLAG_ROLLBACK ( 1ULL << 1 )
+#define WSREP_FLAG_ISOLATION ( 1ULL << 2 )
+#define WSREP_FLAG_PA_UNSAFE ( 1ULL << 3 )
+#define WSREP_FLAG_COMMUTATIVE ( 1ULL << 4 )
+#define WSREP_FLAG_NATIVE ( 1ULL << 5 )
+#define WSREP_FLAG_TRX_START ( 1ULL << 6 )
+#define WSREP_FLAG_TRX_PREPARE ( 1ULL << 7 )
+#define WSREP_FLAG_SNAPSHOT ( 1ULL << 8 )
+#define WSREP_FLAG_IMPLICIT_DEPS ( 1ULL << 9 )
+
+#define WSREP_FLAGS_LAST WSREP_FLAG_IMPLICIT_DEPS
+#define WSREP_FLAGS_MASK ((WSREP_FLAGS_LAST << 1) - 1)
+
+
+typedef uint64_t wsrep_trx_id_t; //!< application transaction ID
+typedef uint64_t wsrep_conn_id_t; //!< application connection ID
+typedef int64_t wsrep_seqno_t; //!< sequence number of a writeset, etc.
+#ifdef __cplusplus
+typedef bool wsrep_bool_t;
+#else
+typedef _Bool wsrep_bool_t; //!< should be the same as standard (C99) bool
+#endif /* __cplusplus */
+
+/*! undefined seqno */
+#define WSREP_SEQNO_UNDEFINED (-1)
+
+
+/*! wsrep provider status codes */
+typedef enum wsrep_status
+{
+ WSREP_OK = 0, //!< success
+ WSREP_WARNING, //!< minor warning, error logged
+ WSREP_TRX_MISSING, //!< transaction is not known by wsrep
+ WSREP_TRX_FAIL, //!< transaction aborted, server can continue
+ WSREP_BF_ABORT, //!< trx was victim of brute force abort
+ WSREP_SIZE_EXCEEDED, //!< data exceeded maximum supported size
+ WSREP_CONN_FAIL, //!< error in client connection, must abort
+ WSREP_NODE_FAIL, //!< error in node state, wsrep must reinit
+ WSREP_FATAL, //!< fatal error, server must abort
+ WSREP_NOT_IMPLEMENTED, //!< feature not implemented
+ WSREP_NOT_ALLOWED //!< operation not allowed
+} wsrep_status_t;
+
+
+/*! wsrep callbacks status codes */
+typedef enum wsrep_cb_status
+{
+ WSREP_CB_SUCCESS = 0, //!< success (as in "not critical failure")
+ WSREP_CB_FAILURE //!< critical failure (consistency violation)
+ /* Technically, wsrep provider has no use for specific failure codes since
+ * there is nothing it can do about it but abort execution. Therefore any
+ * positive number shall indicate a critical failure. Optionally that value
+ * may be used by provider to come to a consensus about state consistency
+ * in a group of nodes. */
+} wsrep_cb_status_t;
+
+
+/*!
+ * UUID type - for all unique IDs
+ */
+typedef union wsrep_uuid {
+ uint8_t data[16];
+ size_t alignment;
+} wsrep_uuid_t;
+
+/*! Undefined UUID */
+static const wsrep_uuid_t WSREP_UUID_UNDEFINED = {{0,}};
+
+/*! UUID string representation length, terminating '\0' not included */
+#define WSREP_UUID_STR_LEN 36
+
+/*!
+ * Scan UUID from string
+ * @return length of UUID string representation or negative error code
+ */
+extern int
+wsrep_uuid_scan (const char* str, size_t str_len, wsrep_uuid_t* uuid);
+
+/*!
+ * Print UUID to string
+ * @return length of UUID string representation or negative error code
+ */
+extern int
+wsrep_uuid_print (const wsrep_uuid_t* uuid, char* str, size_t str_len);
+
+/*!
+ * @brief Compare two UUIDs
+ *
+ * Performs a byte by byte comparison of lhs and rhs.
+ * Returns 0 if lhs and rhs match, otherwise -1 or 1 according to the
+ * difference of the first byte that differs in lsh and rhs.
+ *
+ * @return -1, 0, 1 if lhs is respectively smaller, equal, or greater than rhs
+ */
+extern int
+wsrep_uuid_compare (const wsrep_uuid_t* lhs, const wsrep_uuid_t* rhs);
+
+#define WSREP_MEMBER_NAME_LEN 32 //!< maximum logical member name length
+#define WSREP_INCOMING_LEN 256 //!< max Domain Name length + 0x00
+
+
+/*!
+ * Global transaction identifier
+ */
+typedef struct wsrep_gtid
+{
+ wsrep_uuid_t uuid; /*!< History UUID */
+ wsrep_seqno_t seqno; /*!< Sequence number */
+} wsrep_gtid_t;
+
+/*! Undefined GTID */
+static const wsrep_gtid_t WSREP_GTID_UNDEFINED = {{{0, }}, -1};
+
+/*! Minimum number of bytes guaranteed to store GTID string representation,
+ * terminating '\0' not included (36 + 1 + 20) */
+#define WSREP_GTID_STR_LEN 57
+
+
+/*!
+ * Scan GTID from string
+ * @return length of GTID string representation or negative error code
+ */
+extern int
+wsrep_gtid_scan(const char* str, size_t str_len, wsrep_gtid_t* gtid);
+
+/*!
+ * Print GTID to string
+ * @return length of GTID string representation or negative error code
+ */
+extern int
+wsrep_gtid_print(const wsrep_gtid_t* gtid, char* str, size_t str_len);
+
+/*!
+ * Source/server transaction ID (trx ID assigned at originating node)
+ */
+typedef struct wsrep_stid {
+ wsrep_uuid_t node; //!< source node ID
+ wsrep_trx_id_t trx; //!< local trx ID at source
+ wsrep_conn_id_t conn; //!< local connection ID at source
+} wsrep_stid_t;
+
+/*!
+ * Transaction meta data
+ */
+typedef struct wsrep_trx_meta
+{
+ wsrep_gtid_t gtid; /*!< Global transaction identifier */
+ wsrep_stid_t stid; /*!< Source transaction identifier */
+ wsrep_seqno_t depends_on; /*!< Sequence number of the last transaction
+ this transaction may depend on */
+} wsrep_trx_meta_t;
+
+/*! Abstract data buffer structure */
+typedef struct wsrep_buf
+{
+ const void* ptr; /*!< Pointer to data buffer */
+ size_t len; /*!< Length of buffer */
+} wsrep_buf_t;
+
+/*! Transaction handle struct passed for wsrep transaction handling calls */
+typedef struct wsrep_ws_handle
+{
+ wsrep_trx_id_t trx_id; //!< transaction ID
+ void* opaque; //!< opaque provider transaction context data
+} wsrep_ws_handle_t;
+
+/*!
+ * member status
+ */
+typedef enum wsrep_member_status {
+ WSREP_MEMBER_UNDEFINED, //!< undefined state
+ WSREP_MEMBER_JOINER, //!< incomplete state, requested state transfer
+ WSREP_MEMBER_DONOR, //!< complete state, donates state transfer
+ WSREP_MEMBER_JOINED, //!< complete state
+ WSREP_MEMBER_SYNCED, //!< complete state, synchronized with group
+ WSREP_MEMBER_ERROR, //!< this and above is provider-specific error code
+ WSREP_MEMBER_MAX
+} wsrep_member_status_t;
+
+/*!
+ * static information about a group member (some fields are tentative yet)
+ */
+typedef struct wsrep_member_info {
+ wsrep_uuid_t id; //!< group-wide unique member ID
+ char name[WSREP_MEMBER_NAME_LEN]; //!< human-readable name
+ char incoming[WSREP_INCOMING_LEN]; //!< address for client requests
+} wsrep_member_info_t;
+
+/*!
+ * group status
+ */
+typedef enum wsrep_view_status {
+ WSREP_VIEW_PRIMARY, //!< primary group configuration (quorum present)
+ WSREP_VIEW_NON_PRIMARY, //!< non-primary group configuration (quorum lost)
+ WSREP_VIEW_DISCONNECTED, //!< not connected to group, retrying.
+ WSREP_VIEW_MAX
+} wsrep_view_status_t;
+
+/*!
+ * view of the group
+ */
+typedef struct wsrep_view_info {
+ wsrep_gtid_t state_id; //!< global state ID
+ wsrep_seqno_t view; //!< global view number
+ wsrep_view_status_t status; //!< view status
+ wsrep_cap_t capabilities;//!< capabilities available in the view
+ int my_idx; //!< index of this member in the view
+ int memb_num; //!< number of members in the view
+ int proto_ver; //!< application protocol agreed on the view
+ wsrep_member_info_t members[1];//!< array of member information
+} wsrep_view_info_t;
+
+
+/*!
+ * @brief connected to group
+ *
+ * This handler is called once the first primary view is seen.
+ * The purpose of this call is to provide basic information only,
+ * like node UUID and group UUID.
+ */
+typedef enum wsrep_cb_status (*wsrep_connected_cb_t) (
+ void* app_ctx,
+ const wsrep_view_info_t* view
+);
+
+
+/*!
+ * @brief group view handler
+ *
+ * This handler is called in *total order* corresponding to the group
+ * configuration change. It is to provide a vital information about
+ * new group view.
+ *
+ * @param app_ctx application context
+ * @param recv_ctx receiver context
+ * @param view new view on the group
+ * @param state current state
+ * @param state_len length of current state
+ */
+typedef enum wsrep_cb_status (*wsrep_view_cb_t) (
+ void* app_ctx,
+ void* recv_ctx,
+ const wsrep_view_info_t* view,
+ const char* state,
+ size_t state_len
+);
+
+
+/*!
+ * Magic string to tell provider to engage into trivial (empty) state transfer.
+ * No data will be passed, but the node shall be considered JOINED.
+ * Should be passed in sst_req parameter of wsrep_sst_cb_t.
+ */
+#define WSREP_STATE_TRANSFER_TRIVIAL "trivial"
+
+/*!
+ * Magic string to tell provider not to engage in state transfer at all.
+ * The member will stay in WSREP_MEMBER_UNDEFINED state but will keep on
+ * receiving all writesets.
+ * Should be passed in sst_req parameter of wsrep_sst_cb_t.
+ */
+#define WSREP_STATE_TRANSFER_NONE "none"
+
+
+/*!
+ * @brief Creates and returns State Snapshot Transfer request for provider.
+ *
+ * This handler is called whenever the node is found to miss some of events
+ * from the cluster history (e.g. fresh node joining the cluster).
+ * SST will be used if it is impossible (or impractically long) to replay
+ * missing events, which may be not known in advance, so the node must always
+ * be ready to accept full SST or abort in case event replay is impossible.
+ *
+ * Normally SST request is an opaque buffer that is passed to the
+ * chosen SST donor node and must contain information sufficient for
+ * donor to deliver SST (typically SST method and delivery address).
+ * See above macros WSREP_STATE_TRANSFER_TRIVIAL and WSREP_STATE_TRANSFER_NONE
+ * to modify the standard provider behavior.
+ *
+ * @note Currently it is assumed that sst_req is allocated using
+ * malloc()/calloc()/realloc() and it will be freed by
+ * wsrep provider.
+ *
+ * @param app_ctx application context
+ * @param sst_req location to store SST request
+ * @param sst_req_len location to store SST request length or error code,
+ * value of 0 means no SST.
+ */
+typedef enum wsrep_cb_status (*wsrep_sst_request_cb_t) (
+ void* app_ctx,
+ void** sst_req,
+ size_t* sst_req_len
+);
+
+
+/*!
+ * @brief apply callback
+ *
+ * This handler is called from wsrep library to apply replicated writeset
+ * Must support brute force applying for multi-master operation
+ *
+ * @param recv_ctx receiver context pointer provided by the application
+ * @param ws_handle internal provider writeset handle
+ * @param flags WSREP_FLAG_... flags
+ * @param data data buffer containing the writeset
+ * @param meta transaction meta data of the writeset to be applied
+ * @param exit_loop set to true to exit receive loop
+ *
+ * @return error code:
+ * @retval 0 - success
+ * @retval non-0 - application-specific error code
+ */
+typedef enum wsrep_cb_status (*wsrep_apply_cb_t) (
+ void* recv_ctx,
+ const wsrep_ws_handle_t* ws_handle,
+ uint32_t flags,
+ const wsrep_buf_t* data,
+ const wsrep_trx_meta_t* meta,
+ wsrep_bool_t* exit_loop
+);
+
+
+/*!
+ * @brief unordered callback
+ *
+ * This handler is called to execute unordered actions (actions that need not
+ * to be executed in any particular order) attached to writeset.
+ *
+ * @param recv_ctx receiver context pointer provided by the application
+ * @param data data buffer containing the writeset
+ */
+typedef enum wsrep_cb_status (*wsrep_unordered_cb_t) (
+ void* recv_ctx,
+ const wsrep_buf_t* data
+);
+
+
+/*!
+ * @brief a callback to donate state snapshot
+ *
+ * This handler is called from wsrep library when it needs this node
+ * to deliver state to a new cluster member.
+ * No state changes will be committed for the duration of this call.
+ * Wsrep implementation may provide internal state to be transmitted
+ * to new cluster member for initial state.
+ *
+ * @param app_ctx application context
+ * @param recv_ctx receiver context
+ * @param str_msg state transfer request message
+ * @param gtid current state ID on this node
+ * @param state current wsrep internal state buffer
+ * @param bypass bypass snapshot transfer, only transfer uuid:seqno pair
+ */
+typedef enum wsrep_cb_status (*wsrep_sst_donate_cb_t) (
+ void* app_ctx,
+ void* recv_ctx,
+ const wsrep_buf_t* str_msg,
+ const wsrep_gtid_t* state_id,
+ const wsrep_buf_t* state,
+ wsrep_bool_t bypass
+);
+
+
+/*!
+ * @brief a callback to signal application that wsrep state is synced
+ * with cluster
+ *
+ * This callback is called after wsrep library has got in sync with
+ * rest of the cluster.
+ *
+ * @param app_ctx application context
+ *
+ * @return wsrep_cb_status enum
+ */
+typedef enum wsrep_cb_status (*wsrep_synced_cb_t) (void* app_ctx);
+
+
+/*
+ * An opaque encryption key of arbitrary size - provided by the application
+ * May contain not only the key, but also algorithm specification and the like.
+ */
+typedef wsrep_buf_t wsrep_enc_key_t;
+
+/*
+ * Initialization vector/nonce. Given that most symmetric ciphers use 16 byte
+ * blocks this can be made 32 bytes without much loss of generality.
+ * Must be set by provider to start an encryption/decrytpion operation.
+ */
+typedef char wsrep_enc_iv_t[32];
+
+/*
+ * Encryption context that should be sufficient to deterministically encrypt/
+ * decrypt a data buffer either standalone or as part of a stream. May be used
+ * passed in apply_cb() along with the encrypted replication events to
+ * application as well.
+ *
+ * @param key [in] can be a pointer to const since provider will have to keep
+ * the keys until the last writeset that uses the key is in the
+ * cache
+ * @param iv [in] initialization vector for the beginning of the new
+ * operation.
+ * @param ctx [in/out] ongoing operation context
+ * To initialize a new context the encrypt_cb() caller sets it to
+ * NULL, which signals the encryption of a new continuous buffer.
+ * In that case the callback allocates the new context (using
+ * supplied key and iv) and stores the pointer to it for
+ * processing subsequent data.
+ * The end of the operation is signaled by passing TRUE in the
+ * parameter `last` to the encryption callback, the callback then
+ * finishes any pending encryption and deallocates the context.
+ */
+typedef struct
+{
+ const wsrep_enc_key_t* key;
+ const wsrep_enc_iv_t* iv;
+ void* ctx;
+}
+wsrep_enc_ctx_t;
+
+/*
+ * Encryption direction
+ */
+typedef enum
+{
+ WSREP_ENC = 0, /* encryption */
+ WSREP_DEC = 1 /* decryption */
+}
+wsrep_enc_direction_t;
+
+/*
+ * Encryption/decryption callback. Must be used by both provider and the
+ * application to obtain identical results. Can be NULL for no encryption.
+ *
+ * @param app_ctx application context
+ * @param enc_ctx current operation context
+ * @param input input data buffer
+ * @param output an output buffer, must be at least the size of the input
+ * data plus unwritten bytes from the previous call(s). E.g. in
+ * block mode, encryption/decryption operation will write data
+ * to output in multiples of the algoritm block size. So a call
+ * to encrypt a single byte won't normally write anything to
+ * output waiting for the next input chunk. So on the next call
+ * it may write one byte more than was given in the input.
+ * @param direction of the operation (encryption/decryption)
+ * @param last true if this is the last buffer to encrypt in the stream.
+ * In that case the callback shall write the remaining bytes of
+ * the stream to output (if any) and deallocate ctx->ctx if
+ * allocated previously
+ *
+ * @return a number of bytes written to output or a negative error code.
+ */
+typedef int (*wsrep_encrypt_cb_t)
+(
+ void* app_ctx,
+ wsrep_enc_ctx_t* enc_ctx,
+ const wsrep_buf_t* input,
+ void* output,
+ wsrep_enc_direction_t direction,
+ bool last
+);
+
+
+/*!
+ * Initialization parameters for wsrep provider.
+ */
+struct wsrep_init_args
+{
+ void* app_ctx; //!< Application context for callbacks
+
+ /* Configuration parameters */
+ const char* node_name; //!< Symbolic name of this node (e.g. hostname)
+ const char* node_address; //!< Address to be used by wsrep provider
+ const char* node_incoming; //!< Address for incoming client connections
+ const char* data_dir; //!< Directory where wsrep files are kept if any
+ const char* options; //!< Provider-specific configuration string
+ int proto_ver; //!< Max supported application protocol version
+
+ /* Application initial state information. */
+ const wsrep_gtid_t* state_id; //!< Application state GTID
+ const wsrep_buf_t* state; //!< Initial state for wsrep provider
+
+ /* Application callbacks */
+ wsrep_log_cb_t logger_cb; //!< logging handler
+ wsrep_connected_cb_t connected_cb; //!< connected to group
+ wsrep_view_cb_t view_cb; //!< group view change handler
+ wsrep_sst_request_cb_t sst_request_cb; //!< SST request creator
+ wsrep_encrypt_cb_t encrypt_cb; //!< Encryption callback
+
+ /* Applier callbacks */
+ wsrep_apply_cb_t apply_cb; //!< apply callback
+ wsrep_unordered_cb_t unordered_cb; //!< callback for unordered actions
+
+ /* State Snapshot Transfer callbacks */
+ wsrep_sst_donate_cb_t sst_donate_cb; //!< donate SST
+ wsrep_synced_cb_t synced_cb; //!< synced with group
+};
+
+
+/*! Type of the stats variable value in struct wsrep_status_var */
+typedef enum wsrep_var_type
+{
+ WSREP_VAR_STRING, //!< pointer to null-terminated string
+ WSREP_VAR_INT64, //!< int64_t
+ WSREP_VAR_DOUBLE //!< double
+}
+wsrep_var_type_t;
+
+/*! Generalized stats variable representation */
+struct wsrep_stats_var
+{
+ const char* name; //!< variable name
+ wsrep_var_type_t type; //!< variable value type
+ union {
+ int64_t _int64;
+ double _double;
+ const char* _string;
+ } value; //!< variable value
+};
+
+
+/*! Key struct used to pass certification keys for transaction handling calls.
+ * A key consists of zero or more key parts. */
+typedef struct wsrep_key
+{
+ const wsrep_buf_t* key_parts; /*!< Array of key parts */
+ size_t key_parts_num; /*!< Number of key parts */
+} wsrep_key_t;
+
+/*! Key type:
+ * SHARED - higher level resource shared between clients, e.g. SQL table
+ * REFERENCE - resource referenced but not modified, e.g. parent row
+ * UPDATE - resource is modified
+ * EXCLUSIVE - resource is either created or deleted */
+typedef enum wsrep_key_type
+{
+ WSREP_KEY_SHARED = 0,
+ WSREP_KEY_REFERENCE,
+ WSREP_KEY_UPDATE,
+ WSREP_KEY_EXCLUSIVE
+} wsrep_key_type_t;
+
+/*! Data type:
+ * ORDERED state modification event that should be applied and committed
+ * in order.
+ * UNORDERED some action that does not modify state and execution of which is
+ * optional and does not need to happen in order.
+ * ANNOTATION (human readable) writeset annotation. */
+typedef enum wsrep_data_type
+{
+ WSREP_DATA_ORDERED = 0,
+ WSREP_DATA_UNORDERED,
+ WSREP_DATA_ANNOTATION
+} wsrep_data_type_t;
+
+
+/*!
+ * @brief Helper method to reset trx writeset handle state when trx id changes
+ *
+ * Instead of passing wsrep_ws_handle_t directly to wsrep calls,
+ * wrapping handle with this call offloads bookkeeping from
+ * application.
+ */
+static inline wsrep_ws_handle_t* wsrep_ws_handle_for_trx(
+ wsrep_ws_handle_t* ws_handle,
+ wsrep_trx_id_t trx_id)
+{
+ if (ws_handle->trx_id != trx_id)
+ {
+ ws_handle->trx_id = trx_id;
+ ws_handle->opaque = NULL;
+ }
+ return ws_handle;
+}
+
+
+/*!
+ * A handle for processing preordered actions.
+ * Must be initialized to WSREP_PO_INITIALIZER before use.
+ */
+typedef struct wsrep_po_handle { void* opaque; } wsrep_po_handle_t;
+
+static const wsrep_po_handle_t WSREP_PO_INITIALIZER = { NULL };
+
+
+typedef struct wsrep_st wsrep_t;
+/*!
+ * wsrep interface for dynamically loadable libraries
+ */
+struct wsrep_st {
+
+ const char *version; //!< interface version string
+
+ /*!
+ * @brief Initializes wsrep provider
+ *
+ * @param wsrep provider handle
+ * @param args wsrep initialization parameters
+ */
+ wsrep_status_t (*init) (wsrep_t* wsrep,
+ const struct wsrep_init_args* args);
+
+ /*!
+ * @brief Returns provider capabilities bitmap
+ *
+ * Note that these are potential provider capabilities. Provider will
+ * offer only capabilities supported by all members in the view
+ * (see wsrep_view_info).
+ *
+ * @param wsrep provider handle
+ */
+ wsrep_cap_t (*capabilities) (wsrep_t* wsrep);
+
+ /*!
+ * @brief Passes provider-specific configuration string to provider.
+ *
+ * @param wsrep provider handle
+ * @param conf configuration string
+ *
+ * @retval WSREP_OK configuration string was parsed successfully
+ * @retval WSREP_WARNING could not parse configuration string, no action taken
+ */
+ wsrep_status_t (*options_set) (wsrep_t* wsrep, const char* conf);
+
+ /*!
+ * @brief Returns provider-specific string with current configuration values.
+ *
+ * @param wsrep provider handle
+ *
+ * @return a dynamically allocated string with current configuration
+ * parameter values
+ */
+ char* (*options_get) (wsrep_t* wsrep);
+
+ /*!
+ * @brief A call to set/rotate the key in provider.
+ *
+ * This may happen asynchronously and so is a best effort operation.
+ * Some buffers may still be encrypted with a previous key.
+ *
+ * @param a key object for the encryption callback
+ *
+ * return success or an error code
+ */
+ wsrep_status_t (*enc_set_key)(wsrep_t* wsrep, const wsrep_enc_key_t* key);
+
+ /*!
+ * @brief Opens connection to cluster
+ *
+ * Returns when either node is ready to operate as a part of the cluster
+ * or fails to reach operating status.
+ *
+ * @param wsrep provider handle
+ * @param cluster_name unique symbolic cluster name
+ * @param cluster_url URL-like cluster address (backend://address)
+ * @param state_donor name of the node to be asked for state transfer.
+ * @param bootstrap a flag to request initialization of a new wsrep
+ * service rather then a connection to the existing one.
+ * cluster_url may still carry important initialization
+ * parameters, like backend spec and/or listen address.
+ */
+ wsrep_status_t (*connect) (wsrep_t* wsrep,
+ const char* cluster_name,
+ const char* cluster_url,
+ const char* state_donor,
+ wsrep_bool_t bootstrap);
+
+ /*!
+ * @brief Closes connection to cluster.
+ *
+ * @param wsrep this wsrep handler
+ */
+ wsrep_status_t (*disconnect)(wsrep_t* wsrep);
+
+ /*!
+ * @brief start receiving replication events
+ *
+ * This function does not return until provider is closed or \p exit_loop
+ * parameter to wsrep_apply_cb_t() is set to true.
+ *
+ * @param wsrep provider handle
+ * @param recv_ctx receiver context
+ */
+ wsrep_status_t (*recv)(wsrep_t* wsrep, void* recv_ctx);
+
+ /*!
+ * @brief Tells provider that a given writeset has a read view associated
+ * with it.
+ *
+ * @param wsrep provider handle
+ * @param handle writeset handle
+ * @param rv read view GTID established by the caller or if NULL,
+ * provider will infer it internally.
+ */
+ wsrep_status_t (*assign_read_view)(wsrep_t* wsrep,
+ wsrep_ws_handle_t* handle,
+ const wsrep_gtid_t* rv);
+
+ /*!
+ * @brief Certifies transaction with provider.
+ *
+ * Must be called before transaction commit. Returns success code, which
+ * caller must check.
+ *
+ * In case of WSREP_OK, transaction can proceed to commit.
+ * Otherwise transaction must rollback.
+ *
+ * In case of a failure there are two conceptually different situations:
+ * - the writeset was not ordered. In that case meta struct shall contain
+ * undefined GTID: WSREP_UUID_UNDEFINED:WSREP_SEQNO_UNDEFINED.
+ * - the writeset was successfully ordered, but failed certification.
+ * In this case meta struct shall contain a valid GTID.
+ *
+ * Regardless of the return code, if meta struct contains a valid GTID
+ * the commit order critical section must be entered with that GTID.
+ *
+ * @param wsrep provider handle
+ * @param conn_id connection ID
+ * @param ws_handle writeset of committing transaction
+ * @param flags fine tuning the replication WSREP_FLAG_*
+ * @param meta transaction meta data
+ *
+ * @retval WSREP_OK writeset successfully certified, can commit
+ * @retval WSREP_TRX_FAIL must rollback transaction
+ * @retval WSREP_CONN_FAIL must close client connection
+ * @retval WSREP_NODE_FAIL must close all connections and reinit
+ */
+ wsrep_status_t (*certify)(wsrep_t* wsrep,
+ wsrep_conn_id_t conn_id,
+ wsrep_ws_handle_t* ws_handle,
+ uint32_t flags,
+ wsrep_trx_meta_t* meta);
+
+ /*!
+ * @brief Enters commit order critical section.
+ *
+ * Anything executed between this call and commit_order_leave() will be
+ * executed in provider enforced order.
+ *
+ * @param wsrep provider handle
+ * @param ws_handle internal provider writeset handle
+ * @param meta transaction meta data
+ *
+ * @retval WSREP_OK commit order entered successfully
+ * @retval WSREP_NODE_FAIL must close all connections and reinit
+ */
+ wsrep_status_t (*commit_order_enter)(wsrep_t* wsrep,
+ const wsrep_ws_handle_t* ws_handle,
+ const wsrep_trx_meta_t* meta);
+
+ /*!
+ * @brief Leaves commit order critical section
+ *
+ * Anything executed between commit_order_enter() and this call will be
+ * executed in provider enforced order.
+ *
+ * @param wsrep provider handle
+ * @param ws_handle internal provider writeset handle
+ * @param meta transaction meta data
+ * @param error buffer containing error info (null/empty for no error)
+ *
+ * @retval WSREP_OK commit order left successfully
+ * @retval WSREP_NODE_FAIL must close all connections and reinit
+ */
+ wsrep_status_t (*commit_order_leave)(wsrep_t* wsrep,
+ const wsrep_ws_handle_t* ws_handle,
+ const wsrep_trx_meta_t* meta,
+ const wsrep_buf_t* error);
+
+ /*!
+ * @brief Releases resources after transaction commit/rollback.
+ *
+ * Ends total order critical section.
+ *
+ * @param wsrep provider handle
+ * @param ws_handle writeset of committing transaction
+ * @retval WSREP_OK release succeeded
+ */
+ wsrep_status_t (*release) (wsrep_t* wsrep,
+ wsrep_ws_handle_t* ws_handle);
+
+ /*!
+ * @brief Replay trx as a slave writeset
+ *
+ * If local trx has been aborted by brute force, and it has already
+ * replicated before this abort, we must try if we can apply it as
+ * slave trx. Note that slave nodes see only trx writesets and certification
+ * test based on write set content can be different to DBMS lock conflicts.
+ *
+ * @param wsrep provider handle
+ * @param ws_handle writeset of committing transaction
+ * @param trx_ctx transaction context
+ *
+ * @retval WSREP_OK cluster commit succeeded
+ * @retval WSREP_TRX_FAIL must rollback transaction
+ * @retval WSREP_BF_ABORT brute force abort happened after trx replicated
+ * must rollback transaction and try to replay
+ * @retval WSREP_CONN_FAIL must close client connection
+ * @retval WSREP_NODE_FAIL must close all connections and reinit
+ */
+ wsrep_status_t (*replay_trx)(wsrep_t* wsrep,
+ const wsrep_ws_handle_t* ws_handle,
+ void* trx_ctx);
+
+ /*!
+ * @brief Abort certify() call of another thread.
+ *
+ * It is possible, that some high-priority transaction needs to abort
+ * another transaction which is in certify() call waiting for resources.
+ *
+ * The kill routine checks that abort is not attempted against a transaction
+ * which is front of the caller (in total order).
+ *
+ * If the abort was successful, the victim sequence number is stored
+ * into location pointed by the victim_seqno.
+ *
+ * @param wsrep provider handle
+ * @param bf_seqno seqno of brute force trx, running this cancel
+ * @param victim_trx transaction to be aborted, and which is committing
+ * @param victim_seqno seqno of the victim transaction if assigned
+ *
+ * @retval WSREP_OK abort succeeded
+ * @retval WSREP_NOT_ALLOWED the provider declined the abort request
+ * @retval WSREP_TRX_MISSING the victim_trx was missing
+ * @retval WSREP_WARNING abort failed
+ */
+ wsrep_status_t (*abort_certification)(wsrep_t* wsrep,
+ wsrep_seqno_t bf_seqno,
+ wsrep_trx_id_t victim_trx,
+ wsrep_seqno_t* victim_seqno);
+
+ /*!
+ * @brief Send a rollback fragment on behalf of trx
+ *
+ * @param wsrep provider handle
+ * @param trx transaction to be rolled back
+ * @param data data to append to the fragment
+ *
+ * @retval WSREP_OK rollback fragment sent successfully
+ */
+ wsrep_status_t (*rollback)(wsrep_t* wsrep,
+ wsrep_trx_id_t trx,
+ const wsrep_buf_t* data);
+
+ /*!
+ * @brief Appends a row reference to transaction writeset
+ *
+ * Both copy flag and key_type can be ignored by provider (key type
+ * interpreted as WSREP_KEY_EXCLUSIVE).
+ *
+ * @param wsrep provider handle
+ * @param ws_handle writeset handle
+ * @param keys array of keys
+ * @param count length of the array of keys
+ * @param type type of the key
+ * @param copy can be set to FALSE if keys persist through commit.
+ */
+ wsrep_status_t (*append_key)(wsrep_t* wsrep,
+ wsrep_ws_handle_t* ws_handle,
+ const wsrep_key_t* keys,
+ size_t count,
+ enum wsrep_key_type type,
+ wsrep_bool_t copy);
+
+ /*!
+ * @brief Appends data to transaction writeset
+ *
+ * This method can be called any time before certify() call and it appends
+ * a data buffer to the transaction writeset.
+ * Repeated calls of the method will result in direct buffer concatenation
+ * and all data will be passed as a single buffer to the apply callback.
+ *
+ * Both copy and unordered flags can be ignored by provider.
+ *
+ * @param wsrep provider handle
+ * @param ws_handle writeset handle
+ * @param data array of data buffers
+ * @param count buffer count
+ * @param type type of data
+ * @param copy can be set to FALSE if data persists through commit.
+ */
+ wsrep_status_t (*append_data)(wsrep_t* wsrep,
+ wsrep_ws_handle_t* ws_handle,
+ const wsrep_buf_t* data,
+ size_t count,
+ enum wsrep_data_type type,
+ wsrep_bool_t copy);
+
+ /*!
+ * @brief Blocks until the given GTID is committed
+ *
+ * This call will block the caller until the given GTID
+ * is guaranteed to be committed, or until a timeout occurs.
+ * The timeout value is given in parameter tout, if tout is -1,
+ * then the global causal read timeout applies.
+ *
+ * If no pointer upto is provided the call will block until
+ * causal ordering with all possible preceding writes in the
+ * cluster is guaranteed.
+ *
+ * If pointer to gtid is non-null, the call stores the global
+ * transaction ID of the last transaction which is guaranteed
+ * to be committed when the call returns.
+ *
+ * @param wsrep provider handle
+ * @param upto gtid to wait upto
+ * @param tout timeout in seconds
+ * -1 wait for global causal read timeout
+ * @param gtid location to store GTID
+ */
+ wsrep_status_t (*sync_wait)(wsrep_t* wsrep,
+ wsrep_gtid_t* upto,
+ int tout,
+ wsrep_gtid_t* gtid);
+
+ /*!
+ * @brief Returns the last committed gtid
+ *
+ * @param gtid location to store GTID
+ */
+ wsrep_status_t (*last_committed_id)(wsrep_t* wsrep,
+ wsrep_gtid_t* gtid);
+
+ /*!
+ * @brief Clears allocated connection context.
+ *
+ * Whenever a new connection ID is passed to wsrep provider through
+ * any of the API calls, a connection context is allocated for this
+ * connection. This call is to explicitly notify provider of connection
+ * closing.
+ *
+ * @param wsrep provider handle
+ * @param conn_id connection ID
+ * @param query the 'set database' query
+ * @param query_len length of query (does not end with 0)
+ */
+ wsrep_status_t (*free_connection)(wsrep_t* wsrep,
+ wsrep_conn_id_t conn_id);
+
+ /*!
+ * @brief Replicates a query and starts "total order isolation" section.
+ *
+ * Regular mode:
+ *
+ * Replicates the action spec and returns success code, which caller must
+ * check. Total order isolation continues until to_execute_end() is called.
+ * Regular "total order isolation" is achieved by calling to_execute_start()
+ * with WSREP_FLAG_TRX_START and WSREP_FLAG_TRX_END set.
+ *
+ * Two-phase mode:
+ *
+ * In this mode a query execution is split in two phases. The first phase is
+ * acquiring total order isolation to access critical section and the
+ * second phase is to release acquired resources in total order.
+ *
+ * To start the first phase the call is made with WSREP_FLAG_TRX_START set.
+ * The action is replicated and success code is returned. The total order
+ * isolation continues until to_execute_end() is called. However, the provider
+ * will keep the reference to the operation for conflict resolution purposes.
+ *
+ * The second phase is started with WSREP_FLAG_TRX_END set. Provider
+ * returns once it has achieved total ordering isolation for second phase.
+ * Total order isolation continues until to_execute_end() is called.
+ * All references to the operation are cleared by provider before
+ * call to to_execute_end() returns.
+ *
+ * @param wsrep provider handle
+ * @param conn_id connection ID
+ * @param keys array of keys
+ * @param keys_num length of the array of keys
+ * @param action action buffer array to be executed
+ * @param count action buffer count
+ * @param flags flags
+ * @param meta transaction meta data
+ *
+ * @retval WSREP_OK cluster commit succeeded
+ * @retval WSREP_CONN_FAIL must close client connection
+ * @retval WSREP_NODE_FAIL must close all connections and reinit
+ */
+ wsrep_status_t (*to_execute_start)(wsrep_t* wsrep,
+ wsrep_conn_id_t conn_id,
+ const wsrep_key_t* keys,
+ size_t keys_num,
+ const wsrep_buf_t* action,
+ size_t count,
+ uint32_t flags,
+ wsrep_trx_meta_t* meta);
+
+ /*!
+ * @brief Ends the total order isolation section.
+ *
+ * Marks the end of total order isolation. TO locks are freed
+ * and other transactions are free to commit from this point on.
+ *
+ * @param wsrep provider handle
+ * @param conn_id connection ID
+ * @param error error information about TOI operation (empty for no error)
+ *
+ * @retval WSREP_OK cluster commit succeeded
+ * @retval WSREP_CONN_FAIL must close client connection
+ * @retval WSREP_NODE_FAIL must close all connections and reinit
+ */
+ wsrep_status_t (*to_execute_end)(wsrep_t* wsrep,
+ wsrep_conn_id_t conn_id,
+ const wsrep_buf_t* error);
+
+
+ /*!
+ * @brief Collects preordered replication events into a writeset.
+ *
+ * @param wsrep wsrep provider handle
+ * @param handle a handle associated with a given writeset
+ * @param data an array of data buffers.
+ * @param count length of data buffer array.
+ * @param copy whether provider needs to make a copy of events.
+ *
+ * @retval WSREP_OK cluster-wide commit succeeded
+ * @retval WSREP_TRX_FAIL operation failed (e.g. trx size exceeded limit)
+ * @retval WSREP_NODE_FAIL must close all connections and reinit
+ */
+ wsrep_status_t (*preordered_collect) (wsrep_t* wsrep,
+ wsrep_po_handle_t* handle,
+ const wsrep_buf_t* data,
+ size_t count,
+ wsrep_bool_t copy);
+
+ /*!
+ * @brief "Commits" preordered writeset to cluster.
+ *
+ * The contract is that the writeset will be committed in the same (partial)
+ * order this method was called. Frees resources associated with the writeset
+ * handle and reinitializes the handle.
+ *
+ * @param wsrep wsrep provider handle
+ * @param po_handle a handle associated with a given writeset
+ * @param source_id ID of the event producer, also serves as the partial order
+ * or stream ID - events with different source_ids won't be
+ * ordered with respect to each other.
+ * @param flags WSREP_FLAG_... flags
+ * @param pa_range the number of preceding events this event can be processed
+ * in parallel with. A value of 0 means strict serial
+ * processing. Note: commits always happen in wsrep order.
+ * @param commit 'true' to commit writeset to cluster (replicate) or
+ * 'false' to rollback (cancel) the writeset.
+ *
+ * @retval WSREP_OK cluster-wide commit succeeded
+ * @retval WSREP_TRX_FAIL operation failed (e.g. NON-PRIMARY component)
+ * @retval WSREP_NODE_FAIL must close all connections and reinit
+ */
+ wsrep_status_t (*preordered_commit) (wsrep_t* wsrep,
+ wsrep_po_handle_t* handle,
+ const wsrep_uuid_t* source_id,
+ uint32_t flags,
+ int pa_range,
+ wsrep_bool_t commit);
+
+ /*!
+ * @brief Signals to wsrep provider that state snapshot has been sent to
+ * joiner.
+ *
+ * @param wsrep provider handle
+ * @param state_id state ID
+ * @param rcode 0 or negative error code of the operation.
+ */
+ wsrep_status_t (*sst_sent)(wsrep_t* wsrep,
+ const wsrep_gtid_t* state_id,
+ int rcode);
+
+ /*!
+ * @brief Signals to wsrep provider that new state snapshot has been received.
+ * May deadlock if called from sst_prepare_cb.
+ *
+ * @param wsrep provider handle
+ * @param state_id state ID
+ * @param state initial state provided by SST donor
+ * @param rcode 0 or negative error code of the operation.
+ */
+ wsrep_status_t (*sst_received)(wsrep_t* wsrep,
+ const wsrep_gtid_t* state_id,
+ const wsrep_buf_t* state,
+ int rcode);
+
+
+ /*!
+ * @brief Generate request for consistent snapshot.
+ *
+ * If successful, this call will generate internally SST request
+ * which in turn triggers calling SST donate callback on the nodes
+ * specified in donor_spec. If donor_spec is null, callback is
+ * called only locally. This call will block until sst_sent is called
+ * from callback.
+ *
+ * @param wsrep provider handle
+ * @param msg context message for SST donate callback
+ * @param msg_len length of context message
+ * @param donor_spec list of snapshot donors
+ */
+ wsrep_status_t (*snapshot)(wsrep_t* wsrep,
+ const wsrep_buf_t* msg,
+ const char* donor_spec);
+
+ /*!
+ * @brief Returns an array of status variables.
+ * Array is terminated by Null variable name.
+ *
+ * @param wsrep provider handle
+ * @return array of struct wsrep_status_var.
+ */
+ struct wsrep_stats_var* (*stats_get) (wsrep_t* wsrep);
+
+ /*!
+ * @brief Release resources that might be associated with the array.
+ *
+ * @param wsrep provider handle.
+ * @param var_array array returned by stats_get().
+ */
+ void (*stats_free) (wsrep_t* wsrep, struct wsrep_stats_var* var_array);
+
+ /*!
+ * @brief Reset some stats variables to initial value, provider-dependent.
+ *
+ * @param wsrep provider handle.
+ */
+ void (*stats_reset) (wsrep_t* wsrep);
+
+ /*!
+ * @brief Pauses writeset applying/committing.
+ *
+ * @return global sequence number of the paused state or negative error code.
+ */
+ wsrep_seqno_t (*pause) (wsrep_t* wsrep);
+
+ /*!
+ * @brief Resumes writeset applying/committing.
+ */
+ wsrep_status_t (*resume) (wsrep_t* wsrep);
+
+ /*!
+ * @brief Desynchronize from cluster
+ *
+ * Effectively turns off flow control for this node, allowing it
+ * to fall behind the cluster.
+ */
+ wsrep_status_t (*desync) (wsrep_t* wsrep);
+
+ /*!
+ * @brief Request to resynchronize with cluster.
+ *
+ * Effectively turns on flow control. Asynchronous - actual synchronization
+ * event to be delivered via sync_cb.
+ */
+ wsrep_status_t (*resync) (wsrep_t* wsrep);
+
+ /*!
+ * @brief Acquire global named lock
+ *
+ * @param wsrep wsrep provider handle
+ * @param name lock name
+ * @param shared shared or exclusive lock
+ * @param owner 64-bit owner ID
+ * @param tout timeout in nanoseconds.
+ * 0 - return immediately, -1 wait forever.
+ * @return wsrep status or negative error code
+ * @retval -EDEADLK lock was already acquired by this thread
+ * @retval -EBUSY lock was busy
+ */
+ wsrep_status_t (*lock) (wsrep_t* wsrep,
+ const char* name, wsrep_bool_t shared,
+ uint64_t owner, int64_t tout);
+
+ /*!
+ * @brief Release global named lock
+ *
+ * @param wsrep wsrep provider handle
+ * @param name lock name
+ * @param owner 64-bit owner ID
+ * @return wsrep status or negative error code
+ * @retval -EPERM lock does not belong to this owner
+ */
+ wsrep_status_t (*unlock) (wsrep_t* wsrep, const char* name, uint64_t owner);
+
+ /*!
+ * @brief Check if global named lock is locked
+ *
+ * @param wsrep wsrep provider handle
+ * @param name lock name
+ * @param owner if not NULL will contain 64-bit owner ID
+ * @param node if not NULL will contain owner's node UUID
+ * @return true if lock is locked
+ */
+ wsrep_bool_t (*is_locked) (wsrep_t* wsrep, const char* name, uint64_t* conn,
+ wsrep_uuid_t* node);
+
+ /*!
+ * wsrep provider name
+ */
+ const char* provider_name;
+
+ /*!
+ * wsrep provider version
+ */
+ const char* provider_version;
+
+ /*!
+ * wsrep provider vendor name
+ */
+ const char* provider_vendor;
+
+ /*!
+ * @brief Frees allocated resources before unloading the library.
+ * @param wsrep provider handle
+ */
+ void (*free)(wsrep_t* wsrep);
+
+ void *dlh; //!< reserved for future use
+ void *ctx; //!< reserved for implementation private context
+};
+
+
+/*!
+ *
+ * @brief Loads wsrep library
+ *
+ * @param spec path to wsrep library. If NULL or WSREP_NONE initializes dummy
+ * pass-through implementation.
+ * @param hptr wsrep handle
+ * @param log_cb callback to handle loader messages. Otherwise writes to stderr.
+ *
+ * @return zero on success, errno on failure
+ */
+int wsrep_load(const char* spec, wsrep_t** hptr, wsrep_log_cb_t log_cb);
+
+/*!
+ * @brief Unloads the wsrep library. The application must call
+ * wsrep->free() before unload to release library side resources.
+ *
+ * @param hptr wsrep handler pointer
+ */
+void wsrep_unload(wsrep_t* hptr);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* WSREP_H */
diff --git a/wsrep-lib/wsrep-API/v26/wsrep_dummy.c b/wsrep-lib/wsrep-API/v26/wsrep_dummy.c
new file mode 100644
index 00000000..7bd441dc
--- /dev/null
+++ b/wsrep-lib/wsrep-API/v26/wsrep_dummy.c
@@ -0,0 +1,462 @@
+/* Copyright (C) 2009-2010 Codership Oy <info@codersihp.com>
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; version 2 of the License.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program; if not, write to the Free Software
+ Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+/*! @file Dummy wsrep API implementation. */
+
+#include "wsrep_api.h"
+
+#include <errno.h>
+#include <stdbool.h>
+#include <string.h>
+
+/*! Dummy backend context. */
+typedef struct wsrep_dummy
+{
+ wsrep_log_cb_t log_fn;
+ char* options;
+} wsrep_dummy_t;
+
+/* Get pointer to wsrep_dummy context from wsrep_t pointer */
+#define WSREP_DUMMY(_p) ((wsrep_dummy_t *) (_p)->ctx)
+
+/* Trace function usage a-la DBUG */
+#define WSREP_DBUG_ENTER(_w) do { \
+ if (WSREP_DUMMY(_w)) { \
+ if (WSREP_DUMMY(_w)->log_fn) \
+ WSREP_DUMMY(_w)->log_fn(WSREP_LOG_DEBUG, __FUNCTION__); \
+ } \
+ } while (0)
+
+
+static void dummy_free(wsrep_t *w)
+{
+ if (!w->ctx) return;
+
+ WSREP_DBUG_ENTER(w);
+ if (WSREP_DUMMY(w)->options) {
+ free(WSREP_DUMMY(w)->options);
+ WSREP_DUMMY(w)->options = NULL;
+ }
+ free(w->ctx);
+ w->ctx = NULL;
+}
+
+static wsrep_status_t dummy_init (wsrep_t* w,
+ const struct wsrep_init_args* args)
+{
+ WSREP_DUMMY(w)->log_fn = args->logger_cb;
+ WSREP_DBUG_ENTER(w);
+ if (args->options) {
+ WSREP_DUMMY(w)->options = strdup(args->options);
+ }
+ return WSREP_OK;
+}
+
+static wsrep_cap_t dummy_capabilities (wsrep_t* w __attribute__((unused)))
+{
+ return 0;
+}
+
+static wsrep_status_t dummy_options_set(
+ wsrep_t* w,
+ const char* conf)
+{
+ WSREP_DBUG_ENTER(w);
+ if (WSREP_DUMMY(w)->options) {
+ free(WSREP_DUMMY(w)->options);
+ WSREP_DUMMY(w)->options = NULL;
+ }
+ if (conf) {
+ WSREP_DUMMY(w)->options = strdup(conf);
+ }
+ return WSREP_OK;
+}
+
+static char* dummy_options_get (wsrep_t* w)
+{
+ WSREP_DBUG_ENTER(w);
+ return strdup(WSREP_DUMMY(w)->options);
+}
+
+static wsrep_status_t dummy_enc_set_key(
+ wsrep_t* w,
+ const wsrep_enc_key_t* key __attribute__((unused)))
+{
+ WSREP_DBUG_ENTER(w);
+ return WSREP_OK;
+}
+
+static wsrep_status_t dummy_connect(
+ wsrep_t* w,
+ const char* name __attribute__((unused)),
+ const char* url __attribute__((unused)),
+ const char* donor __attribute__((unused)),
+ wsrep_bool_t bootstrap __attribute__((unused)))
+{
+ WSREP_DBUG_ENTER(w);
+ return WSREP_OK;
+}
+
+static wsrep_status_t dummy_disconnect(wsrep_t* w)
+{
+ WSREP_DBUG_ENTER(w);
+ return WSREP_OK;
+}
+
+static wsrep_status_t dummy_recv(wsrep_t* w,
+ void* recv_ctx __attribute__((unused)))
+{
+ WSREP_DBUG_ENTER(w);
+ return WSREP_OK;
+}
+
+static wsrep_status_t dummy_assign_read_view(
+ wsrep_t* w,
+ wsrep_ws_handle_t* ws_handle __attribute__((unused)),
+ const wsrep_gtid_t* rv __attribute__((unused)))
+{
+ WSREP_DBUG_ENTER(w);
+ return WSREP_OK;
+}
+
+static wsrep_status_t dummy_certify(
+ wsrep_t* w,
+ const wsrep_conn_id_t conn_id __attribute__((unused)),
+ wsrep_ws_handle_t* ws_handle __attribute__((unused)),
+ uint32_t flags __attribute__((unused)),
+ wsrep_trx_meta_t* meta __attribute__((unused)))
+{
+ WSREP_DBUG_ENTER(w);
+ return WSREP_OK;
+}
+
+static wsrep_status_t dummy_commit_order_enter(
+ wsrep_t* w,
+ const wsrep_ws_handle_t* ws_handle __attribute__((unused)),
+ const wsrep_trx_meta_t* meta __attribute__((unused)))
+{
+ WSREP_DBUG_ENTER(w);
+ return WSREP_OK;
+}
+
+static wsrep_status_t dummy_commit_order_leave(
+ wsrep_t* w,
+ const wsrep_ws_handle_t* ws_handle __attribute__((unused)),
+ const wsrep_trx_meta_t* meta __attribute__((unused)),
+ const wsrep_buf_t* error __attribute__((unused)))
+{
+ WSREP_DBUG_ENTER(w);
+ return WSREP_OK;
+}
+
+static wsrep_status_t dummy_release(
+ wsrep_t* w,
+ wsrep_ws_handle_t* ws_handle __attribute__((unused)))
+{
+ WSREP_DBUG_ENTER(w);
+ return WSREP_OK;
+}
+
+static wsrep_status_t dummy_replay_trx(
+ wsrep_t* w,
+ const wsrep_ws_handle_t* ws_handle __attribute__((unused)),
+ void* trx_ctx __attribute__((unused)))
+{
+ WSREP_DBUG_ENTER(w);
+ return WSREP_OK;
+}
+
+static wsrep_status_t dummy_abort_certification(
+ wsrep_t* w,
+ const wsrep_seqno_t bf_seqno __attribute__((unused)),
+ const wsrep_trx_id_t trx_id __attribute__((unused)),
+ wsrep_seqno_t *victim_seqno __attribute__((unused)))
+{
+ WSREP_DBUG_ENTER(w);
+ return WSREP_OK;
+}
+
+static wsrep_status_t dummy_rollback(
+ wsrep_t* w,
+ const wsrep_trx_id_t trx __attribute__((unused)),
+ const wsrep_buf_t* data __attribute__((unused)))
+{
+ WSREP_DBUG_ENTER(w);
+ return WSREP_OK;
+}
+
+static wsrep_status_t dummy_append_key(
+ wsrep_t* w,
+ wsrep_ws_handle_t* ws_handle __attribute__((unused)),
+ const wsrep_key_t* key __attribute__((unused)),
+ const size_t key_num __attribute__((unused)),
+ const wsrep_key_type_t key_type __attribute__((unused)),
+ const bool copy __attribute__((unused)))
+{
+ WSREP_DBUG_ENTER(w);
+ return WSREP_OK;
+}
+
+static wsrep_status_t dummy_append_data(
+ wsrep_t* w,
+ wsrep_ws_handle_t* ws_handle __attribute__((unused)),
+ const struct wsrep_buf* data __attribute__((unused)),
+ const size_t count __attribute__((unused)),
+ const wsrep_data_type_t type __attribute__((unused)),
+ const bool copy __attribute__((unused)))
+{
+ WSREP_DBUG_ENTER(w);
+ return WSREP_OK;
+}
+
+static wsrep_status_t dummy_sync_wait(
+ wsrep_t* w,
+ wsrep_gtid_t* upto __attribute__((unused)),
+ int tout __attribute__((unused)),
+ wsrep_gtid_t* gtid __attribute__((unused)))
+{
+ WSREP_DBUG_ENTER(w);
+ return WSREP_OK;
+}
+
+static wsrep_status_t dummy_last_committed_id(
+ wsrep_t* w,
+ wsrep_gtid_t* gtid __attribute__((unused)))
+{
+ WSREP_DBUG_ENTER(w);
+ return WSREP_OK;
+}
+
+static wsrep_status_t dummy_free_connection(
+ wsrep_t* w,
+ const wsrep_conn_id_t conn_id __attribute__((unused)))
+{
+ WSREP_DBUG_ENTER(w);
+ return WSREP_OK;
+}
+
+static wsrep_status_t dummy_to_execute_start(
+ wsrep_t* w,
+ const wsrep_conn_id_t conn_id __attribute__((unused)),
+ const wsrep_key_t* key __attribute__((unused)),
+ const size_t key_num __attribute__((unused)),
+ const struct wsrep_buf* data __attribute__((unused)),
+ const size_t count __attribute__((unused)),
+ const uint32_t flags __attribute__((unused)),
+ wsrep_trx_meta_t* meta __attribute__((unused)))
+{
+ WSREP_DBUG_ENTER(w);
+ return WSREP_OK;
+}
+
+static wsrep_status_t dummy_to_execute_end(
+ wsrep_t* w,
+ const wsrep_conn_id_t conn_id __attribute__((unused)),
+ const wsrep_buf_t* err __attribute__((unused)))
+{
+ WSREP_DBUG_ENTER(w);
+ return WSREP_OK;
+}
+
+static wsrep_status_t dummy_preordered_collect(
+ wsrep_t* w,
+ wsrep_po_handle_t* handle __attribute__((unused)),
+ const struct wsrep_buf* data __attribute__((unused)),
+ size_t count __attribute__((unused)),
+ wsrep_bool_t copy __attribute__((unused)))
+{
+ WSREP_DBUG_ENTER(w);
+ return WSREP_OK;
+}
+
+static wsrep_status_t dummy_preordered_commit(
+ wsrep_t* w,
+ wsrep_po_handle_t* handle __attribute__((unused)),
+ const wsrep_uuid_t* source_id __attribute__((unused)),
+ uint32_t flags __attribute__((unused)),
+ int pa_range __attribute__((unused)),
+ wsrep_bool_t commit __attribute__((unused)))
+{
+ WSREP_DBUG_ENTER(w);
+ return WSREP_OK;
+}
+
+static wsrep_status_t dummy_sst_sent(
+ wsrep_t* w,
+ const wsrep_gtid_t* state_id __attribute__((unused)),
+ const int rcode __attribute__((unused)))
+{
+ WSREP_DBUG_ENTER(w);
+ return WSREP_OK;
+}
+
+static wsrep_status_t dummy_sst_received(
+ wsrep_t* w,
+ const wsrep_gtid_t* state_id __attribute__((unused)),
+ const wsrep_buf_t* state __attribute__((unused)),
+ const int rcode __attribute__((unused)))
+{
+ WSREP_DBUG_ENTER(w);
+ return WSREP_OK;
+}
+
+static wsrep_status_t dummy_snapshot(
+ wsrep_t* w,
+ const wsrep_buf_t* msg __attribute__((unused)),
+ const char* donor_spec __attribute__((unused)))
+{
+ WSREP_DBUG_ENTER(w);
+ return WSREP_OK;
+}
+
+static struct wsrep_stats_var dummy_stats[] = {
+ { NULL, WSREP_VAR_STRING, { 0 } }
+};
+
+static struct wsrep_stats_var* dummy_stats_get (wsrep_t* w)
+{
+ WSREP_DBUG_ENTER(w);
+ return dummy_stats;
+}
+
+static void dummy_stats_free (
+ wsrep_t* w,
+ struct wsrep_stats_var* stats __attribute__((unused)))
+{
+ WSREP_DBUG_ENTER(w);
+}
+
+static void dummy_stats_reset (wsrep_t* w)
+{
+ WSREP_DBUG_ENTER(w);
+}
+
+static wsrep_seqno_t dummy_pause (wsrep_t* w)
+{
+ WSREP_DBUG_ENTER(w);
+ return -ENOSYS;
+}
+
+static wsrep_status_t dummy_resume (wsrep_t* w)
+{
+ WSREP_DBUG_ENTER(w);
+ return WSREP_OK;
+}
+
+static wsrep_status_t dummy_desync (wsrep_t* w)
+{
+ WSREP_DBUG_ENTER(w);
+ return WSREP_NOT_IMPLEMENTED;
+}
+
+static wsrep_status_t dummy_resync (wsrep_t* w)
+{
+ WSREP_DBUG_ENTER(w);
+ return WSREP_OK;
+}
+
+static wsrep_status_t dummy_lock (wsrep_t* w,
+ const char* s __attribute__((unused)),
+ bool r __attribute__((unused)),
+ uint64_t o __attribute__((unused)),
+ int64_t t __attribute__((unused)))
+{
+ WSREP_DBUG_ENTER(w);
+ return WSREP_NOT_IMPLEMENTED;
+}
+
+static wsrep_status_t dummy_unlock (wsrep_t* w,
+ const char* s __attribute__((unused)),
+ uint64_t o __attribute__((unused)))
+{
+ WSREP_DBUG_ENTER(w);
+ return WSREP_OK;
+}
+
+static bool dummy_is_locked (wsrep_t* w,
+ const char* s __attribute__((unused)),
+ uint64_t* o __attribute__((unused)),
+ wsrep_uuid_t* t __attribute__((unused)))
+{
+ WSREP_DBUG_ENTER(w);
+ return false;
+}
+
+static wsrep_t dummy_iface = {
+ WSREP_INTERFACE_VERSION,
+ &dummy_init,
+ &dummy_capabilities,
+ &dummy_options_set,
+ &dummy_options_get,
+ &dummy_enc_set_key,
+ &dummy_connect,
+ &dummy_disconnect,
+ &dummy_recv,
+ &dummy_assign_read_view,
+ &dummy_certify,
+ &dummy_commit_order_enter,
+ &dummy_commit_order_leave,
+ &dummy_release,
+ &dummy_replay_trx,
+ &dummy_abort_certification,
+ &dummy_rollback,
+ &dummy_append_key,
+ &dummy_append_data,
+ &dummy_sync_wait,
+ &dummy_last_committed_id,
+ &dummy_free_connection,
+ &dummy_to_execute_start,
+ &dummy_to_execute_end,
+ &dummy_preordered_collect,
+ &dummy_preordered_commit,
+ &dummy_sst_sent,
+ &dummy_sst_received,
+ &dummy_snapshot,
+ &dummy_stats_get,
+ &dummy_stats_free,
+ &dummy_stats_reset,
+ &dummy_pause,
+ &dummy_resume,
+ &dummy_desync,
+ &dummy_resync,
+ &dummy_lock,
+ &dummy_unlock,
+ &dummy_is_locked,
+ WSREP_NONE,
+ WSREP_INTERFACE_VERSION,
+ "Codership Oy <info@codership.com>",
+ &dummy_free,
+ NULL,
+ NULL
+};
+
+int wsrep_dummy_loader(wsrep_t* w)
+{
+ if (!w)
+ return EINVAL;
+
+ *w = dummy_iface;
+
+ // allocate private context
+ if (!(w->ctx = malloc(sizeof(wsrep_dummy_t))))
+ return ENOMEM;
+
+ // initialize private context
+ WSREP_DUMMY(w)->log_fn = NULL;
+ WSREP_DUMMY(w)->options = NULL;
+
+ return 0;
+}
diff --git a/wsrep-lib/wsrep-API/v26/wsrep_event_service.h b/wsrep-lib/wsrep-API/v26/wsrep_event_service.h
new file mode 100644
index 00000000..2d0d16ea
--- /dev/null
+++ b/wsrep-lib/wsrep-API/v26/wsrep_event_service.h
@@ -0,0 +1,105 @@
+/*
+ * Copyright (C) 2021 Codership Oy <info@codership.com>
+ *
+ * This file is part of wsrep-API.
+ *
+ * Wsrep-API is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * Wsrep-API is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with wsrep-API. If not, see <https://www.gnu.org/licenses/>.
+ */
+
+/** @file wsrep_event_service.h
+ *
+ * This file defines interface for various unordered events generated by the
+ * cluster or the provider.
+ *
+ * An event has a name and a payload, both are null-terminated strings.
+ * (It is intended that payload is a JSON encoded structure).
+ * The name serves to distinguish the events to pass them to respective
+ * handlers.
+ *
+ * The provider which is capable of using the service interface v1 must
+ * export the following functions.
+ *
+ * int wsrep_init_event_service_v1(wsrep_event_service_v1_t*)
+ * void wsrep_deinit_event_service_v1()
+ *
+ * which can be probed by the application.
+ *
+ * The application must initialize the service via above init function
+ * before the provider is initialized via wsrep->init(). The deinit
+ * function must be called after the provider side resources have been
+ * released via wsrep->free().
+ */
+
+#ifndef WSREP_EVENT_SERVICE_H
+#define WSREP_EVENT_SERVICE_H
+
+#include "wsrep_api.h"
+
+#include <sys/types.h> /* posix size_t */
+
+#ifdef __cplusplus
+extern "C"
+{
+#endif /* __cplusplus */
+
+/**
+ * Type tag for application defined event processing context.
+ *
+ * Application may pass pointer to the context when initializing
+ * the event service. This pointer is passed a first parameter for
+ * each service call.
+ */
+typedef struct wsrep_event_context wsrep_event_context_t;
+
+
+/**
+ * Process an event
+ *
+ * @param name event name
+ * @param value JSON enconded event value
+ *
+ * @return void, it is up to the receiver to decide what to do about
+ * possible error.
+ */
+typedef void (*wsrep_event_cb_t)(wsrep_event_context_t*,
+ const char* name, const char* value);
+
+
+/**
+ * Event service struct.
+ *
+ * A pointer to this struct must be passed to the call to
+ * wsrep_init_event_service_v1.
+ *
+ * The application must provide implementation to all functions defined
+ * in this struct.
+ */
+typedef struct wsrep_event_service_v1_st
+{
+ /* Event receiver callback */
+ wsrep_event_cb_t event_cb;
+ /* Pointer to application defined event context. */
+ wsrep_event_context_t* context;
+} wsrep_event_service_v1_t;
+
+#ifdef __cplusplus
+}
+#endif /* __cplusplus */
+
+
+#define WSREP_EVENT_SERVICE_INIT_FUNC_V1 "wsrep_init_event_service_v1"
+#define WSREP_EVENT_SERVICE_DEINIT_FUNC_V1 "wsrep_deinit_event_service_v1"
+
+#endif /* WSREP_EVENT_SERVICE_H */
+
diff --git a/wsrep-lib/wsrep-API/v26/wsrep_gtid.c b/wsrep-lib/wsrep-API/v26/wsrep_gtid.c
new file mode 100644
index 00000000..2b6dfb90
--- /dev/null
+++ b/wsrep-lib/wsrep-API/v26/wsrep_gtid.c
@@ -0,0 +1,77 @@
+/* Copyright (C) 2013 Codership Oy <info@codersihp.com>
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; version 2 of the License.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program; if not, write to the Free Software
+ Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+/*! @file Helper functions to deal with GTID string representations */
+
+#include <errno.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <inttypes.h>
+#include <limits.h>
+
+#include "wsrep_api.h"
+
+/*!
+ * Read GTID from string
+ * @return length of GTID string representation or -EINVAL in case of error
+ */
+int
+wsrep_gtid_scan(const char* str, size_t str_len, wsrep_gtid_t* gtid)
+{
+ int offset;
+ char* endptr;
+ if (str_len > INT_MAX) return -EINVAL;
+
+ if ((offset = wsrep_uuid_scan(str, str_len, &gtid->uuid)) > 0 &&
+ offset < (int)str_len && str[offset] == ':') {
+ ++offset;
+ if (offset < (int)str_len)
+ {
+ errno = 0;
+ gtid->seqno = strtoll(str + offset, &endptr, 0);
+
+ if (errno == 0) {
+ return (int)(endptr - str);
+ }
+ }
+ }
+ *gtid = WSREP_GTID_UNDEFINED;
+ return -EINVAL;
+}
+
+/*!
+ * Write GTID to string
+ * @return length of GTID string representation or -EMSGSIZE if string is too
+ * short
+ */
+int
+wsrep_gtid_print(const wsrep_gtid_t* gtid, char* str, size_t str_len)
+{
+ int offset, ret;
+ if (str_len > INT_MAX) return -EINVAL;
+
+ if ((offset = wsrep_uuid_print(&gtid->uuid, str, str_len)) > 0)
+ {
+ ret = snprintf(str + offset, (size_t)((int)str_len - offset),
+ ":%" PRId64, gtid->seqno);
+ if (ret <= ((int)str_len - offset)) {
+ return (offset + ret);
+ }
+
+ }
+
+ return -EMSGSIZE;
+}
diff --git a/wsrep-lib/wsrep-API/v26/wsrep_loader.c b/wsrep-lib/wsrep-API/v26/wsrep_loader.c
new file mode 100644
index 00000000..cfa1984f
--- /dev/null
+++ b/wsrep-lib/wsrep-API/v26/wsrep_loader.c
@@ -0,0 +1,239 @@
+/* Copyright (C) 2009-2011 Codership Oy <info@codersihp.com>
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; version 2 of the License.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program; if not, write to the Free Software
+ Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+/*! @file wsrep implementation loader */
+
+#include <dlfcn.h>
+#include <errno.h>
+#include <string.h>
+#include <stdio.h>
+
+#include "wsrep_api.h"
+
+// Logging stuff for the loader
+static const char* log_levels[] = {"FATAL", "ERROR", "WARN", "INFO", "DEBUG"};
+
+static void default_logger (wsrep_log_level_t lvl, const char* msg)
+{
+ fprintf (stderr, "wsrep loader: [%s] %s\n", log_levels[lvl], msg);
+}
+
+static wsrep_log_cb_t logger = default_logger;
+
+/**************************************************************************
+ * Library loader
+ **************************************************************************/
+
+static int wsrep_check_iface_version(const char* found, const char* iface_ver)
+{
+ const size_t msg_len = 128;
+ char msg[128];
+
+ if (strcmp(found, iface_ver)) {
+ snprintf (msg, msg_len,
+ "provider interface version mismatch: need '%s', found '%s'",
+ iface_ver, found);
+ logger (WSREP_LOG_ERROR, msg);
+ return EINVAL;
+ }
+
+ return 0;
+}
+
+static int verify(const wsrep_t *wh, const char *iface_ver)
+{
+ char msg[128];
+ const size_t msg_len = sizeof(msg);
+
+#define VERIFY(_p) if (!(_p)) { \
+ snprintf(msg, msg_len, "wsrep_load(): verify(): %s\n", # _p); \
+ logger (WSREP_LOG_ERROR, msg); \
+ return EINVAL; \
+ }
+
+ VERIFY(wh);
+ VERIFY(wh->version);
+
+ if (wsrep_check_iface_version(wh->version, iface_ver))
+ return EINVAL;
+
+ VERIFY(wh->init);
+ VERIFY(wh->options_set);
+ VERIFY(wh->options_get);
+ VERIFY(wh->enc_set_key);
+ VERIFY(wh->connect);
+ VERIFY(wh->disconnect);
+ VERIFY(wh->recv);
+ VERIFY(wh->assign_read_view);
+ VERIFY(wh->certify);
+ VERIFY(wh->commit_order_enter);
+ VERIFY(wh->commit_order_leave);
+ VERIFY(wh->release);
+ VERIFY(wh->replay_trx);
+ VERIFY(wh->abort_certification);
+ VERIFY(wh->append_key);
+ VERIFY(wh->append_data);
+ VERIFY(wh->free_connection);
+ VERIFY(wh->to_execute_start);
+ VERIFY(wh->to_execute_end);
+ VERIFY(wh->preordered_collect);
+ VERIFY(wh->preordered_commit);
+ VERIFY(wh->sst_sent);
+ VERIFY(wh->sst_received);
+ VERIFY(wh->stats_get);
+ VERIFY(wh->stats_free);
+ VERIFY(wh->stats_reset);
+ VERIFY(wh->pause);
+ VERIFY(wh->resume);
+ VERIFY(wh->desync);
+ VERIFY(wh->resync);
+ VERIFY(wh->lock);
+ VERIFY(wh->unlock);
+ VERIFY(wh->is_locked);
+ VERIFY(wh->provider_name);
+ VERIFY(wh->provider_version);
+ VERIFY(wh->provider_vendor);
+ VERIFY(wh->free);
+ return 0;
+}
+
+typedef int (*wsrep_loader_fun)(wsrep_t*);
+
+static wsrep_loader_fun wsrep_dlf(void *dlh, const char *sym)
+{
+ union {
+ wsrep_loader_fun dlfun;
+ void *obj;
+ } alias;
+ alias.obj = dlsym(dlh, sym);
+ return alias.dlfun;
+}
+
+static int wsrep_check_version_symbol(void *dlh)
+{
+ char** dlversion = NULL;
+ dlversion = (char**) dlsym(dlh, "wsrep_interface_version");
+ if (dlversion == NULL)
+ return 0;
+ return wsrep_check_iface_version(*dlversion, WSREP_INTERFACE_VERSION);
+}
+
+extern int wsrep_dummy_loader(wsrep_t *w);
+
+int wsrep_load(const char *spec, wsrep_t **hptr, wsrep_log_cb_t log_cb)
+{
+ int ret = 0;
+ void *dlh = NULL;
+ wsrep_loader_fun dlfun;
+ char msg[1024];
+ const size_t msg_len = sizeof(msg) - 1;
+ msg[msg_len] = 0;
+
+ if (NULL != log_cb)
+ logger = log_cb;
+
+ if (!(spec && hptr))
+ return EINVAL;
+
+ snprintf (msg, msg_len,
+ "wsrep_load(): loading provider library '%s'", spec);
+ logger (WSREP_LOG_INFO, msg);
+
+ if (!(*hptr = malloc(sizeof(wsrep_t)))) {
+ logger (WSREP_LOG_FATAL, "wsrep_load(): out of memory");
+ return ENOMEM;
+ }
+
+ if (!spec || strcmp(spec, WSREP_NONE) == 0) {
+ if ((ret = wsrep_dummy_loader(*hptr)) != 0) {
+ free (*hptr);
+ *hptr = NULL;
+ }
+ return ret;
+ }
+
+ if (!(dlh = dlopen(spec, RTLD_NOW | RTLD_LOCAL))) {
+ snprintf(msg, msg_len, "wsrep_load(): dlopen(): %s", dlerror());
+ logger (WSREP_LOG_ERROR, msg);
+ ret = EINVAL;
+ goto out;
+ }
+
+ if (!(dlfun = wsrep_dlf(dlh, "wsrep_loader"))) {
+ ret = EINVAL;
+ goto out;
+ }
+
+ if (wsrep_check_version_symbol(dlh) != 0) {
+ ret = EINVAL;
+ goto out;
+ }
+
+ if ((ret = (*dlfun)(*hptr)) != 0) {
+ snprintf(msg, msg_len, "wsrep_load(): loader failed: %s",
+ strerror(ret));
+ logger (WSREP_LOG_ERROR, msg);
+ goto out;
+ }
+
+ if ((ret = verify(*hptr, WSREP_INTERFACE_VERSION)) != 0) {
+ snprintf (msg, msg_len,
+ "wsrep_load(): interface version mismatch: my version %s, "
+ "provider version %s", WSREP_INTERFACE_VERSION,
+ (*hptr)->version);
+ logger (WSREP_LOG_ERROR, msg);
+ goto out;
+ }
+
+ (*hptr)->dlh = dlh;
+
+out:
+ if (ret != 0) {
+ if (dlh) dlclose(dlh);
+ free(*hptr);
+ *hptr = NULL;
+ } else {
+ snprintf (msg, msg_len,
+ "wsrep_load(): %s %s by %s loaded successfully.",
+ (*hptr)->provider_name, (*hptr)->provider_version,
+ (*hptr)->provider_vendor);
+ logger (WSREP_LOG_INFO, msg);
+ }
+
+ return ret;
+}
+
+void wsrep_unload(wsrep_t *hptr)
+{
+ if (!hptr) {
+ logger (WSREP_LOG_WARN, "wsrep_unload(): null pointer.");
+ } else {
+ if (hptr->free)
+ hptr->free(hptr);
+ if (hptr->dlh)
+ {
+ int err;
+ if ((err = dlclose(hptr->dlh)))
+ {
+ char msg[1024];
+ snprintf(msg, sizeof(msg), "dlclose(): %s", dlerror());
+ msg[sizeof(msg) - 1] = '\0';
+ logger(WSREP_LOG_WARN, msg);
+ }
+ }
+ free(hptr);
+ }
+}
diff --git a/wsrep-lib/wsrep-API/v26/wsrep_membership_service.h b/wsrep-lib/wsrep-API/v26/wsrep_membership_service.h
new file mode 100644
index 00000000..b6053a2f
--- /dev/null
+++ b/wsrep-lib/wsrep-API/v26/wsrep_membership_service.h
@@ -0,0 +1,138 @@
+/*
+ * Copyright (C) 2020 Codership Oy <info@codership.com>
+ *
+ * This file is part of wsrep-API.
+ *
+ * Wsrep-API is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * Wsrep-API is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with wsrep-API. If not, see <https://www.gnu.org/licenses/>.
+ */
+
+/** @file wsrep_membership_service.h
+ *
+ * This file defines interface for quering the immediate membership and
+ * members' states of the current configuration. The information is provided
+ * OUT OF ORDER to facilitate administrative tasks.
+ *
+ * The provider which is capable of using the service interface v1 must
+ * export the following functions.
+ *
+ * int wsrep_init_membership_service_v1(struct wsrep_membership_service_v1*)
+ * void wsrep_deinit_membership_service_v1()
+ *
+ * which can be probed by the application.
+ *
+ * The application must initialize the service via above init function
+ * before the provider is initialized via wsrep->init(). The deinit
+ * function must be called after the provider side resources have been
+ * released via wsrep->free().
+ */
+
+#ifndef WSREP_MEMBERSHIP_SERVICE_H
+#define WSREP_MEMBERSHIP_SERVICE_H
+
+#include "wsrep_api.h"
+
+#ifdef __cplusplus
+extern "C"
+{
+#endif /* __cplusplus */
+
+/**
+ * Member info structure extended to contain member state
+ */
+struct wsrep_member_info_ext
+{
+ struct wsrep_member_info base;
+ wsrep_seqno_t last_committed;
+ enum wsrep_member_status status;
+};
+
+/**
+ * Extended membership structure
+ */
+struct wsrep_membership
+{
+ /**
+ * Epoch of the membership data (last time it was updated)
+ */
+ wsrep_uuid_t group_uuid;
+ /**
+ * Sequence number of the last received (not processed) action
+ */
+ wsrep_seqno_t last_received;
+ /**
+ * When the members' data was last updated
+ */
+ wsrep_seqno_t updated;
+ /**
+ * Current group state
+ */
+ enum wsrep_view_status state;
+ /**
+ * Number of members in the array
+ */
+ size_t num;
+ /**
+ * Membership array
+ */
+ struct wsrep_member_info_ext members[1];
+};
+
+/**
+ * Memory allocation callback for wsrep_get_mmebership_fn() below
+ *
+ * @param size of buffer to allocate
+ * @return allocated buffer pointer or NULL in case of error
+ */
+typedef void* (*wsrep_allocator_cb) (size_t size);
+
+/**
+ * Query membership
+ *
+ * @param wsrep provider handle
+ * @param allocator to use for wsrep_membership struct allocation
+ * @param membership pointer to pointer to the memebrship structure.
+ * The structure is allocated by provider and must be freed
+ * by the caller.
+ * @return error code of the call
+ */
+typedef wsrep_status_t (*wsrep_get_membership_fn) (
+ wsrep_t* wsrep,
+ wsrep_allocator_cb allocator,
+ struct wsrep_membership** membership);
+
+/**
+ * Membership service struct.
+ * Returned by WSREP_MEMBERSHIP_SERVICE_INIT_FUNC_V1
+ */
+struct wsrep_membership_service_v1
+{
+ wsrep_get_membership_fn get_membership;
+};
+
+#ifdef __cplusplus
+}
+#endif /* __cplusplus */
+
+typedef
+wsrep_status_t
+(*wsrep_membership_service_v1_init_fn) (struct wsrep_membership_service_v1*);
+typedef
+void
+(*wsrep_membership_service_v1_deinit_fn)(void);
+
+/** must be exported by the provider */
+#define WSREP_MEMBERSHIP_SERVICE_V1_INIT_FN "wsrep_init_membership_service_v1"
+#define WSREP_MEMBERSHIP_SERVICE_V1_DEINIT_FN "wsrep_deinit_membership_service_v1"
+
+#endif /* WSREP_MEMBERSHIP_SERVICE_H */
diff --git a/wsrep-lib/wsrep-API/v26/wsrep_thread_service.h b/wsrep-lib/wsrep-API/v26/wsrep_thread_service.h
new file mode 100644
index 00000000..956751aa
--- /dev/null
+++ b/wsrep-lib/wsrep-API/v26/wsrep_thread_service.h
@@ -0,0 +1,355 @@
+/*
+ * Copyright (C) 2019 Codership Oy <info@codership.com>
+ *
+ * This file is part of wsrep-API.
+ *
+ * Wsrep-API is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * Wsrep-API is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with wsrep-API. If not, see <https://www.gnu.org/licenses/>.
+ */
+
+/** @file wsrep_thread_service.h
+ *
+ * Service interface for threads, mutexes and condition variables.
+ * The application which may provide callbacks to routines which will
+ * be used to manage lifetime and use threads and sycnronization primitives.
+ *
+ * The type tags and interface methods are loosely modeled after POSIX
+ * threading interface.
+ *
+ * The application must either none or all of the callbacks defined in
+ * wsrep_thread_service structure which is defined below.
+ *
+ * The error codes returned by the callbacks are generally assumed to
+ * the system error numbers defined in errno.h unless stated otherwise.
+ *
+ * The provider must implement and export the following functions
+ * to provide initialization point for the service implementation:
+ *
+ * Version 1:
+ * int wsrep_init_thread_service_v1(wsrep_thread_service_v1_t*)
+ * void wsrep_deinit_thread_service_v1().
+ *
+ * The application defined implementation must be initialized before
+ * calling the provider initialization function via wsrep->init(). The
+ * deinitialization must be done via deinit function after the
+ * provider side resources have been released via wsrep->free().
+ */
+
+#ifndef WSREP_THREAD_SERVICE_H
+#define WSREP_THREAD_SERVICE_H
+
+#include <stddef.h> /* size_t */
+
+#ifdef __cplusplus
+extern "C"
+{
+#endif /* __cplusplus */
+
+ /* Forward declarations */
+ struct timespec;
+ struct sched_param;
+
+ /** Thread type tags */
+ typedef struct wsrep_thread_key_st wsrep_thread_key_t;
+ typedef struct wsrep_thread_st wsrep_thread_t;
+ /** Mutex type tags */
+ typedef struct wsrep_mutex_key_st wsrep_mutex_key_t;
+ typedef struct wsrep_mutex_st wsrep_mutex_t;
+ /** Condition variable tags */
+ typedef struct wsrep_cond_key_st wsrep_cond_key_t;
+ typedef struct wsrep_cond_st wsrep_cond_t;
+
+ /**
+ * Create key for a thread with a name. This key object will be passed
+ * to thread creation and destrunction notification callbacks.
+ *
+ * @param name Name of the thread.
+ */
+ typedef const wsrep_thread_key_t* (*wsrep_thread_key_create_cb_t)(
+ const char* name);
+
+ /**
+ * Create a new thread.
+ *
+ * @param[out] thread Newly allocated thread.
+ * @param key Key created by wsrep_thread_key_create_cb_t
+ * @param start_fn Pointer to start routine
+ * @param arg Argument for start_fn
+ *
+ * @return Zero in case of success, non-zero error code in case of failure.
+ */
+ typedef int (*wsrep_thread_create_cb_t)(const wsrep_thread_key_t* key,
+ wsrep_thread_t** thread,
+ void* (*start_fn)(void*),
+ void* arg);
+
+ /**
+ * Detach a thread.
+ *
+ * @param thread Thread to be detached.
+ *
+ * @return Zero in case of error, non-zero error code in case of failure.
+ */
+ typedef int (*wsrep_thread_detach_cb_t)(wsrep_thread_t* thread);
+
+ /**
+ * Compare two threads for equality.
+ *
+ * @params t1, t2 Threads to be compared.
+ *
+ * @return Non-zero value if threads are equal, zero otherwise.
+ */
+ typedef int (*wsrep_thread_equal_cb_t)(wsrep_thread_t* t1,
+ wsrep_thread_t* t2);
+
+ /**
+ * Terminate the calling thread.
+ *
+ * @param thread Pointer to thread.
+ * @param retval Pointer to return value.
+ *
+ * This function does not return.
+ */
+ typedef void __attribute__((noreturn)) (*wsrep_thread_exit_cb_t)(
+ wsrep_thread_t* thread, void* retval);
+
+ /**
+ * Join a thread. Trying to join detached thread may cause undefined
+ * behavior.
+ *
+ * @param thread Thread to be joined.
+ * @param[out] retval Return value from the thread wthat was joined.
+ *
+ * @return Zero in case of success, non-zero error code in case of error.
+ */
+ typedef int (*wsrep_thread_join_cb_t)(wsrep_thread_t* thread,
+ void** retval);
+
+ /**
+ * Return a pointer to the wsrep_thread_t of the calling thread.
+ *
+ * @return Pointer to wsrep_thread_t associated with current thread.
+ */
+ typedef wsrep_thread_t* (*wsrep_thread_self_cb_t)(void);
+
+ /**
+ * Set the scheduling policy for the thread.
+ *
+ * @param thread Thread for which sceduing policy should be changed.
+ * @param policy New scheduling policy for the thread.
+ * @param param New scheduling parameters for the thread.
+ */
+ typedef int (*wsrep_thread_setschedparam_cb_t)(
+ wsrep_thread_t* thread, int policy, const struct sched_param* param);
+
+ /**
+ * Get the current scheduling policy for the thread.
+ *
+ * @param thread Thread.
+ * @param policy Pointer to location where the scheduling policy will
+ * will be stored in.
+ * @param Param Pointer to location where the current scheduling
+ * parameters will be stored.
+ */
+ typedef int (*wsrep_thread_getschedparam_cb_t)(wsrep_thread_t* thread,
+ int* policy,
+ struct sched_param* param);
+ /**
+ * Create key for a mutex with a name. This key object must be passed
+ * to mutex creation callback.
+ *
+ * @param name Name of the mutex.
+ *
+ * @return Const pointer to mutex key.
+ */
+ typedef const wsrep_mutex_key_t* (*wsrep_mutex_key_create_cb_t)(
+ const char* name);
+
+ /**
+ * Create a mutex.
+ *
+ * @param key Mutex key obtained via wsrep_mutex_key_create_cb call.
+ * @param memblock Optional memory block allocated by the provider
+ * which can be used by the implementation to store
+ * the mutex.
+ * @param memblock_size Size of the optional memory block.
+ *
+ * @return Pointer to wsrep_mutex_t object or NULL in case of failure.
+ */
+ typedef wsrep_mutex_t* (*wsrep_mutex_init_cb_t)(
+ const wsrep_mutex_key_t* key, void* memblock, size_t memblock_size);
+
+ /**
+ * Destroy a mutex. This call must consume the mutex object.
+ *
+ * @param mutex Mutex to be destroyed.
+ */
+ typedef int (*wsrep_mutex_destroy_cb_t)(wsrep_mutex_t* mutex);
+
+ /**
+ * Lock a mutex.
+ *
+ * @param mutex Mutex to be locked.
+ *
+ * @return Zero on success, non-zero error code on error.
+ */
+ typedef int (*wsrep_mutex_lock_cb_t)(wsrep_mutex_t* mutex);
+
+ /**
+ * Try to lock a mutex.
+ *
+ * @param Mutex to be locked.
+ *
+ * @return Zero if mutex was successfully locked.
+ * @return EBUSY if the mutex could not be acquired because it was already
+ * locked.
+ * @return Non-zero error code on any other error.
+ */
+ typedef int (*wsrep_mutex_trylock_cb_t)(wsrep_mutex_t* mutex);
+
+ /**
+ * Unlock a mutex.
+ *
+ * @param mutex Mutex to be unlocked.
+ *
+ * @return Zero on success, non-zero on error.
+ */
+ typedef int (*wsrep_mutex_unlock_cb_t)(wsrep_mutex_t* mutex);
+
+ /**
+ * Create key for a condition variable with a name. This key
+ * must be passed to wsrep_cond_create_cb when creating a new
+ * condition variable.
+ *
+ * @param name Name of the condition variable.
+ *
+ * @return Allocated key object.
+ */
+ typedef const wsrep_cond_key_t* (*wsrep_cond_key_create_cb_t)(
+ const char* name);
+
+ /**
+ * Create a new condition variable.
+ *
+ * @param key Const pointer to key object created by
+ * wsrep_cond_key_create_cb.
+ * @param memblock Optional memory block allocated by the provider
+ * which can be used by the implementation to store
+ * the mutex.
+ * @param memblock_size Size of the optional memory block.
+ *
+ * @return Pointer to new condition variable.
+ */
+ typedef wsrep_cond_t* (*wsrep_cond_init_cb_t)(const wsrep_cond_key_t* key,
+ void* memblock,
+ size_t memblock_size);
+
+ /**
+ * Destroy a condition variable. This call must consume the condition
+ * variable object.
+ *
+ * @param cond Condition variable to be destroyed.
+ *
+ * @return Zero on success, non-zero on error.
+ */
+ typedef int (*wsrep_cond_destroy_cb_t)(wsrep_cond_t* cond);
+
+ /**
+ * Wait for condition.
+ *
+ * @param cond Condition variable to wait for.
+ * @param mutex Mutex associated to the condition variable. The mutex
+ * may be unlocked for the duration of the wait.
+ *
+ * @return Zero on success, non-zero on error.
+ */
+ typedef int (*wsrep_cond_wait_cb_t)(wsrep_cond_t* cond,
+ wsrep_mutex_t* mutex);
+
+ /**
+ * Perform timed wait on condition.
+ *
+ * @param cond Condition to wait for.
+ * @param mutex Mutex associated to the condition variable. The mutex
+ * may be unlocked for the duration of the wait.
+ * @param wait_until System time to wait until before returning from the
+ * the timed wait.
+ *
+ * @return Zero on success.
+ * @return ETIMEDOUT if the time specified by wait_until has passed.
+ * @return Non-zero error code on other error.
+ */
+ typedef int (*wsrep_cond_timedwait_cb_t)(wsrep_cond_t* cond,
+ wsrep_mutex_t* mutex,
+ const struct timespec* wait_until);
+
+ /**
+ * Signal a condition variable. This will wake up at least one of
+ * the threads which is waiting for the condition.
+ *
+ * @param cond Condition variable to signal.
+ *
+ * @return Zero on success, non-zero on failure.
+ */
+ typedef int (*wsrep_cond_signal_cb_t)(wsrep_cond_t* cond);
+
+ /**
+ * Broadcast a signal to condition variable. This will wake up
+ * all the threads which are currently waiting on condition variable.
+ *
+ * @param cond Condition variable to broadcast the signal to.
+ *
+ * @return Zero on success, non-zero on failure.
+ */
+ typedef int (*wsrep_cond_broadcast_cb_t)(wsrep_cond_t* cond);
+
+ typedef struct wsrep_thread_service_v1_st
+ {
+ /* Threads */
+ wsrep_thread_key_create_cb_t thread_key_create_cb;
+ wsrep_thread_create_cb_t thread_create_cb;
+ wsrep_thread_detach_cb_t thread_detach_cb;
+ wsrep_thread_equal_cb_t thread_equal_cb;
+ wsrep_thread_exit_cb_t thread_exit_cb;
+ wsrep_thread_join_cb_t thread_join_cb;
+ wsrep_thread_self_cb_t thread_self_cb;
+ wsrep_thread_setschedparam_cb_t thread_setschedparam_cb;
+ wsrep_thread_getschedparam_cb_t thread_getschedparam_cb;
+ /* Mutexes */
+ wsrep_mutex_key_create_cb_t mutex_key_create_cb;
+ wsrep_mutex_init_cb_t mutex_init_cb;
+ wsrep_mutex_destroy_cb_t mutex_destroy_cb;
+ wsrep_mutex_lock_cb_t mutex_lock_cb;
+ wsrep_mutex_trylock_cb_t mutex_trylock_cb;
+ wsrep_mutex_unlock_cb_t mutex_unlock_cb;
+ /* Condition variables */
+ wsrep_cond_key_create_cb_t cond_key_create_cb;
+ wsrep_cond_init_cb_t cond_init_cb;
+ wsrep_cond_destroy_cb_t cond_destroy_cb;
+ wsrep_cond_wait_cb_t cond_wait_cb;
+ wsrep_cond_timedwait_cb_t cond_timedwait_cb;
+ wsrep_cond_signal_cb_t cond_signal_cb;
+ wsrep_cond_broadcast_cb_t cond_broadcast_cb;
+ } wsrep_thread_service_v1_t;
+
+#ifdef __cplusplus
+}
+
+#define WSREP_THREAD_SERVICE_INIT_FUNC_V1 "wsrep_init_thread_service_v1"
+#define WSREP_THREAD_SERVICE_DEINIT_FUNC_V1 "wsrep_deinit_thread_service_v1"
+
+/* For backwards compatibility. */
+#define WSREP_THREAD_SERVICE_INIT_FUNC WSREP_THREAD_SERVICE_INIT_FUNC_V1
+
+#endif /* __cplusplus */
+#endif /* WSREP_THREAD_SERVICE_H */
diff --git a/wsrep-lib/wsrep-API/v26/wsrep_tls_service.h b/wsrep-lib/wsrep-API/v26/wsrep_tls_service.h
new file mode 100644
index 00000000..c632f4aa
--- /dev/null
+++ b/wsrep-lib/wsrep-API/v26/wsrep_tls_service.h
@@ -0,0 +1,326 @@
+/*
+ * Copyright (C) 2020 Codership Oy <info@codership.com>
+ *
+ * This file is part of wsrep-API.
+ *
+ * Wsrep-API is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * Wsrep-API is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with wsrep-API. If not, see <https://www.gnu.org/licenses/>.
+ */
+
+/** @file wsrep_tls_service.h
+ *
+ * This file defines interface for TLS services provided by the application,
+ * used by the provider.
+ *
+ * In order to support both synchronous and asynchronous IO operations,
+ * the interface is designed to work with sockets in both blocking
+ * and non-blockig mode.
+ *
+ * The provider is in charge of opening and closing file
+ * descriptors and connecting transport. After the connection has
+ * been established, all further IO operations will be delegated
+ * to the TLS service implementation which is provided by the application.
+ *
+ * The provider which is capable of using the service interface v1 must
+ * export the following functions.
+ *
+ * int wsrep_init_tls_service_v1(wsrep_tls_service_v1_t*)
+ * void wsrep_deinit_tls_service_v1()
+ *
+ * which can be probed by the application.
+ *
+ * The application must initialize the service via above init function
+ * before the provider is initialized via wsrep->init(). The deinit
+ * function must be called after the provider side resources have been
+ * released via wsrep->free().
+ */
+
+#ifndef WSREP_TLS_SERVICE_H
+#define WSREP_TLS_SERVICE_H
+
+#include <sys/types.h> /* posix size_t */
+
+#ifdef __cplusplus
+extern "C"
+{
+#endif /* __cplusplus */
+
+/**
+ * Type tag for application defined TLS context.
+ *
+ * Application may pass pointer to the context when initializing
+ * TLS service. This pointer is passed a first parameter for
+ * each service call.
+ */
+typedef struct wsrep_tls_context wsrep_tls_context_t;
+
+/**
+ * TLS stream structure.
+ */
+typedef struct wsrep_tls_stream_st
+{
+ /**
+ * File descriptor corresponding to the stream. The provider is
+ * responsible in opening and closing the socket.
+ */
+ int fd;
+ /**
+ * Opaque pointer reserved for application use.
+ */
+ void* opaque;
+} wsrep_tls_stream_t;
+
+/**
+ * Enumeration for return codes.
+ */
+enum wsrep_tls_result
+{
+ /**
+ * The operation completed successfully, no further actions
+ * are necessary.
+ */
+ wsrep_tls_result_success = 0,
+ /**
+ * The operation completed successfully, but the application side wants
+ * to make further reads. The provider must wait until the stream
+ * becomes readable and then try the same operation again.
+ */
+ wsrep_tls_result_want_read,
+ /**
+ * The operation completed successfully, but the application side wants
+ * to make further writes. The provider must wait until the stream
+ * becomes writable and then try the same operation again.
+ */
+ wsrep_tls_result_want_write,
+ /**
+ * End of file was read from the stream. This result is needed to
+ * make difference between graceful stream shutdown and zero length
+ * reads which result from errors.
+ */
+ wsrep_tls_result_eof,
+ /**
+ * An error occurred. The specific error reason must be
+ * queried with wsrep_tls_stream_get_error_number and
+ * wsrep_tls_stream_get_error_category.
+ */
+ wsrep_tls_result_error
+};
+
+/**
+ * Initialize a new TLS stream.
+ *
+ * Initialize the stream for IO operations. During this call the
+ * application must set up all of the data structures needed for
+ * IO, but must not do any reads or writes into the stream yet.
+ *
+ * @param stream TLS stream to be initialized.
+ *
+ * @return Zero on success, system error number on error.
+ */
+typedef int (*wsrep_tls_stream_init_t)(wsrep_tls_context_t*,
+ wsrep_tls_stream_t* stream);
+
+/**
+ * Deinitialize the TLS stream.
+ *
+ * Deinitialize the TLS stream and free all allocated resources.
+ * Note that this function must not close the socket file descriptor
+ * associated the the stream.
+ *
+ * @param stream Stream to be deinitialized.
+ */
+typedef void (*wsrep_tls_stream_deinit_t)(wsrep_tls_context_t*,
+ wsrep_tls_stream_t* stream);
+
+/**
+ * Get error number of the last stream error. The error numbers are
+ * defined by the application and must be integral type. By the convention
+ * zero value must denote success.
+ *
+ * For managing errors other than system errors, the application may
+ * provide several error categories via wsrep_tls_stream_get_error_category_t.
+ *
+ * @param stream TLS stream to get the last error from.
+ *
+ * @return Error number.
+ */
+typedef int (*wsrep_tls_stream_get_error_number_t)(
+ wsrep_tls_context_t*,
+ const wsrep_tls_stream_t* stream);
+
+/**
+ * Get the error category of the last stream error.
+ *
+ * The category is represented via a const void pointer to the provider.
+ * If the category is NULL pointer, the error number is assumed to be
+ * system error.
+ *
+ * @param stream Stream to get last error category from.
+ *
+ * @return Pointer to error category.
+ */
+typedef const void* (*wsrep_tls_stream_get_error_category_t)(
+ wsrep_tls_context_t*,
+ const wsrep_tls_stream_t* stream);
+
+/**
+ * Return human readable error message by error number and error
+ * category.
+ *
+ * The message string returned by the application must contain only
+ * printable characters and must be null terminated.
+ *
+ * @param error_number Error number returned by
+ * wsrep_tls_stream_get_error_number_t.
+ * @param category Error category returned by
+ * wsrep_tls_stream_get_error_category_t.
+ *
+ * @return Human readable message string.
+ */
+typedef const char* (*wsrep_tls_error_message_get_t)(
+ wsrep_tls_context_t*,
+ const wsrep_tls_stream_t* stream,
+ int error_number, const void* category);
+
+/**
+ * Initiate TLS client side handshake. This function is called for the
+ * stream sockets which have been connected by the provider.
+ *
+ * If the stream socket is in non-blocking mode, the call should return
+ * immediately with appropriate result indicating if more actions are needed
+ * in the case the operation would block. The provider will call this function
+ * again until either a success or an error is returned.
+ *
+ * @param stream TLS stream.
+ *
+ * @return Enum wsrep_tls_result.
+ */
+typedef enum wsrep_tls_result (*wsrep_tls_stream_client_handshake_t)(
+ wsrep_tls_context_t*,
+ wsrep_tls_stream_t* stream);
+
+/**
+ * Initiate TLS server side handshake. This function is called for stream
+ * sockets which have been accepted by the provider.
+ *
+ * If the stream socket is in non-blocking mode, the call should return
+ * immediately with appropriate result indicating if more actions are needed
+ * in the case the operation would block. The provider will call this function
+ * again until either a success or an error is returned.
+ *
+ * @param stream TLS stream.
+ *
+ * @return Enum wsrep_tls_result.
+ */
+typedef enum wsrep_tls_result (*wsrep_tls_stream_server_handshake_t)(
+ wsrep_tls_context_t*,
+ wsrep_tls_stream_t* stream);
+
+/**
+ * Perform a read from the stream. If the file descriptor associated
+ * to the stream is in non-blocking mode, the call must return immediately
+ * with appropriate result if the stream processing would block.
+ *
+ * @param[in] stream TLS stream.
+ * @param[in] buf Buffer to read the data into.
+ * @param[in] max_count Maximum number of bytes to read.
+ * @param[out] bytes_transferred Number of bytes read into the buffer during
+ * the operation.
+ *
+ * @return Enum wsrep_tls_result.
+ */
+typedef enum wsrep_tls_result (*wsrep_tls_stream_read_t)(
+ wsrep_tls_context_t*,
+ wsrep_tls_stream_t* stream,
+ void* buf,
+ size_t max_count,
+ size_t* bytes_transferred);
+
+/**
+ * Perform a write to the stream. If the file descriptor asociated to
+ * te stream is in non-blocking mode, the call must return immediately
+ * with appropriate result if the stream processing would block.
+ *
+ * @param[in] stream TLS stream.
+ * @param[in] buf Buffer which contains the data to write.
+ * @param[in] count Number of bytes to be written.
+ * @param[out] bytes_transferred Number of bytes written into the stream
+ * during the opration.
+ *
+ * @return Enum wsrep_tls_result.
+ */
+typedef enum wsrep_tls_result (*wsrep_tls_stream_write_t)(
+ wsrep_tls_context_t*,
+ wsrep_tls_stream_t* stream,
+ const void* buf,
+ size_t count,
+ size_t* bytes_transferred);
+
+/**
+ * Shutdown the TLS stream.
+ *
+ * Note that the implementation must not close the associated stream
+ * socket, just shut down the protocol.
+ *
+ * If the shutdown call returns either wsrep_result_want_read or
+ * wsrep_result_want_write, the provider must wait until the socket
+ * becomes readable or writable and then call the function again
+ * until the return status is either success or an error occurs.
+ *
+ * @param stream TLS stream to be shut down.
+ *
+ * @return Enum wsrep_tls_result code.
+ *
+ */
+typedef enum wsrep_tls_result (*wsrep_tls_stream_shutdown_t)(
+ wsrep_tls_context_t*,
+ wsrep_tls_stream_t* stream);
+
+/**
+ * TLS service struct.
+ *
+ * A pointer to this struct must be passed to the call to
+ * wsrep_init_tls_service_v1.
+ *
+ * The application must provide implementation to all functions defined
+ * in this struct.
+ */
+typedef struct wsrep_tls_service_v1_st
+{
+ /* Stream */
+ wsrep_tls_stream_init_t stream_init;
+ wsrep_tls_stream_deinit_t stream_deinit;
+ wsrep_tls_stream_get_error_number_t stream_get_error_number;
+ wsrep_tls_stream_get_error_category_t stream_get_error_category;
+ wsrep_tls_stream_client_handshake_t stream_client_handshake;
+ wsrep_tls_stream_server_handshake_t stream_server_handshake;
+ wsrep_tls_stream_read_t stream_read;
+ wsrep_tls_stream_write_t stream_write;
+ wsrep_tls_stream_shutdown_t stream_shutdown;
+ /* Error */
+ wsrep_tls_error_message_get_t error_message_get;
+ /* Pointer to application defined TLS context. */
+ wsrep_tls_context_t* context;
+} wsrep_tls_service_v1_t;
+
+
+#ifdef __cplusplus
+}
+#endif /* __cplusplus */
+
+
+#define WSREP_TLS_SERVICE_INIT_FUNC_V1 "wsrep_init_tls_service_v1"
+#define WSREP_TLS_SERVICE_DEINIT_FUNC_V1 "wsrep_deinit_tls_service_v1"
+
+#endif /* WSREP_TLS_SERVICE_H */
+
diff --git a/wsrep-lib/wsrep-API/v26/wsrep_uuid.c b/wsrep-lib/wsrep-API/v26/wsrep_uuid.c
new file mode 100644
index 00000000..3ac2ca91
--- /dev/null
+++ b/wsrep-lib/wsrep-API/v26/wsrep_uuid.c
@@ -0,0 +1,94 @@
+/* Copyright (C) 2009 Codership Oy <info@codersihp.com>
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; version 2 of the License.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program; if not, write to the Free Software
+ Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+/*! @file Helper functions to deal with history UUID string representations */
+
+#include <errno.h>
+#include <ctype.h>
+#include <stdio.h>
+#include <string.h>
+
+#include "wsrep_api.h"
+
+/*!
+ * Read UUID from string
+ * @return length of UUID string representation or -EINVAL in case of error
+ */
+int
+wsrep_uuid_scan (const char* str, size_t str_len, wsrep_uuid_t* uuid)
+{
+ unsigned int uuid_len = 0;
+ unsigned int uuid_offt = 0;
+
+ while (uuid_len + 1 < str_len) {
+ /* We are skipping potential '-' after uuid_offt == 4, 6, 8, 10
+ * which means
+ * (uuid_offt >> 1) == 2, 3, 4, 5,
+ * which in turn means
+ * (uuid_offt >> 1) - 2 <= 3
+ * since it is always >= 0, because uuid_offt is unsigned */
+ if (((uuid_offt >> 1) - 2) <= 3 && str[uuid_len] == '-') {
+ // skip dashes after 4th, 6th, 8th and 10th positions
+ uuid_len += 1;
+ continue;
+ }
+
+ if (isxdigit(str[uuid_len]) && isxdigit(str[uuid_len + 1])) {
+ // got hex digit, scan another byte to uuid, increment uuid_offt
+ sscanf (str + uuid_len, "%2hhx", uuid->data + uuid_offt);
+ uuid_len += 2;
+ uuid_offt += 1;
+ if (sizeof (uuid->data) == uuid_offt)
+ return (int)uuid_len;
+ }
+ else {
+ break;
+ }
+ }
+
+ *uuid = WSREP_UUID_UNDEFINED;
+ return -EINVAL;
+}
+
+/*!
+ * Write UUID to string
+ * @return length of UUID string representation or -EMSGSIZE if string is too
+ * short
+ */
+int
+wsrep_uuid_print (const wsrep_uuid_t* uuid, char* str, size_t str_len)
+{
+ if (str_len > 36) {
+ const unsigned char* u = uuid->data;
+ return snprintf(str, str_len, "%02x%02x%02x%02x-%02x%02x-%02x%02x-"
+ "%02x%02x-%02x%02x%02x%02x%02x%02x",
+ u[ 0], u[ 1], u[ 2], u[ 3], u[ 4], u[ 5], u[ 6], u[ 7],
+ u[ 8], u[ 9], u[10], u[11], u[12], u[13], u[14], u[15]);
+ }
+ else {
+ return -EMSGSIZE;
+ }
+}
+
+/*!
+ * Compare two UUIDs
+ * @return -1, 0, 1 if lhs is respectively smaller, equal, or greater than rhs
+ */
+int
+wsrep_uuid_compare (const wsrep_uuid_t* lhs, const wsrep_uuid_t* rhs)
+{
+ return memcmp(lhs, rhs, sizeof(wsrep_uuid_t));
+}