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authorDaniel Baumann <daniel.baumann@progress-linux.org>2018-11-07 12:19:29 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2018-11-07 12:20:17 +0000
commita64a253794ac64cb40befee54db53bde17dd0d49 (patch)
treec1024acc5f6e508814b944d99f112259bb28b1be /libnetdata/config
parentNew upstream version 1.10.0+dfsg (diff)
downloadnetdata-a64a253794ac64cb40befee54db53bde17dd0d49.tar.xz
netdata-a64a253794ac64cb40befee54db53bde17dd0d49.zip
New upstream version 1.11.0+dfsgupstream/1.11.0+dfsg
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to '')
-rw-r--r--libnetdata/config/Makefile.am9
-rw-r--r--libnetdata/config/Makefile.in464
-rw-r--r--libnetdata/config/README.md46
-rw-r--r--libnetdata/config/appconfig.c (renamed from src/appconfig.c)39
-rw-r--r--libnetdata/config/appconfig.h135
5 files changed, 664 insertions, 29 deletions
diff --git a/libnetdata/config/Makefile.am b/libnetdata/config/Makefile.am
new file mode 100644
index 000000000..1cb69ed99
--- /dev/null
+++ b/libnetdata/config/Makefile.am
@@ -0,0 +1,9 @@
+# SPDX-License-Identifier: GPL-3.0-or-later
+
+AUTOMAKE_OPTIONS = subdir-objects
+MAINTAINERCLEANFILES = $(srcdir)/Makefile.in
+
+
+dist_noinst_DATA = \
+ README.md \
+ $(NULL)
diff --git a/libnetdata/config/Makefile.in b/libnetdata/config/Makefile.in
new file mode 100644
index 000000000..940ccb8d8
--- /dev/null
+++ b/libnetdata/config/Makefile.in
@@ -0,0 +1,464 @@
+# Makefile.in generated by automake 1.14.1 from Makefile.am.
+# @configure_input@
+
+# Copyright (C) 1994-2013 Free Software Foundation, Inc.
+
+# This Makefile.in is free software; the Free Software Foundation
+# gives unlimited permission to copy and/or distribute it,
+# with or without modifications, as long as this notice is preserved.
+
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY, to the extent permitted by law; without
+# even the implied warranty of MERCHANTABILITY or FITNESS FOR A
+# PARTICULAR PURPOSE.
+
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+
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+dist_noinst_DATA = \
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+
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+ || exit 1; \
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diff --git a/libnetdata/config/README.md b/libnetdata/config/README.md
new file mode 100644
index 000000000..5e170caa9
--- /dev/null
+++ b/libnetdata/config/README.md
@@ -0,0 +1,46 @@
+# netdata ini config files
+
+Configuration files `netdata.conf` and `stream.conf` are netdata ini files.
+
+## Motivation
+
+The whole idea came up when we were evaluating the documentation involved
+in maintaining a complex configuration system. Our intention was to give
+configuration options for everything imaginable. But then, documenting all
+these options would require a tremendous amount of time, users would have
+to search through endless pages for the option they need, etc.
+
+We concluded then that **configuring software like that is a waste of time
+and effort**. Of course there must be plenty of configuration options, but
+the implementation itself should require a lot less effort for both the
+developers and the users.
+
+So, we did this:
+
+1. No configuration is required to run netdata
+2. There are plenty of options to tweak
+3. There is minimal documentation (or no at all)
+
+## Why this works?
+
+The configuration file is a `name = value` dictionary with `[sections]`.
+Write whatever you like there as long as it follows this simple format.
+
+Netdata loads this dictionary and then when the code needs a value from
+it, it just looks up the `name` in the dictionary at the proper `section`.
+In all places, in the code, there are both the `names` and their
+`default values`, so if something is not found in the configuration
+file, the default is used. The lookup is made using B-Trees and hashes
+(no string comparisons), so they are super fast. Also the `names` of the
+settings can be `my super duper setting that once set to yes, will turn the world upside down = no`
+- so goodbye to most of the documentation involved.
+
+Next, netdata can generate a valid configuration for the user to edit.
+No need to remember anything or copy and paste settings. Just get the
+configuration from the server (`/netdata.conf` on your netdata server),
+edit it and save it.
+
+Last, what about options you believe you have set, but you misspelled?
+When you get the configuration file from the server, there will be a
+comment above all `name = value` pairs the server does not use.
+So you know that whatever you wrote there, is not used.
diff --git a/src/appconfig.c b/libnetdata/config/appconfig.c
index 2424864b5..411538446 100644
--- a/src/appconfig.c
+++ b/libnetdata/config/appconfig.c
@@ -1,4 +1,6 @@
-#include "common.h"
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#include "../libnetdata.h"
#define CONFIG_FILE_LINE_MAX ((CONFIG_MAX_NAME + CONFIG_MAX_VALUE + 1024) * 2)
@@ -7,11 +9,11 @@
#define CONFIG_VALUE_LOADED 0x01 // has been loaded from the config
#define CONFIG_VALUE_USED 0x02 // has been accessed from the program
-#define CONFIG_VALUE_CHANGED 0x04 // has been changed from the loaded value
+#define CONFIG_VALUE_CHANGED 0x04 // has been changed from the loaded value or the internal default value
#define CONFIG_VALUE_CHECKED 0x08 // has been checked if the value is different from the default
struct config_option {
- avl avl; // the index - this has to be first!
+ avl avl; // the index entry of this entry - this has to be first!
uint8_t flags;
uint32_t hash; // a simple hash to speed up searching
@@ -24,7 +26,7 @@ struct config_option {
};
struct section {
- avl avl;
+ avl avl; // the index entry of this section - this has to be first!
uint32_t hash; // a simple hash to speed up searching
// we first compare hashes, and only if the hashes are equal we do string comparisons
@@ -40,25 +42,6 @@ struct section {
// readers are protected using the rwlock in avl_tree_lock
};
-static int appconfig_section_compare(void *a, void *b);
-
-struct config netdata_config = {
- .sections = NULL,
- .mutex = NETDATA_MUTEX_INITIALIZER,
- .index = {
- { NULL, appconfig_section_compare },
- AVL_LOCK_INITIALIZER
- }
-};
-
-struct config stream_config = {
- .sections = NULL,
- .mutex = NETDATA_MUTEX_INITIALIZER,
- .index = {
- { NULL, appconfig_section_compare },
- AVL_LOCK_INITIALIZER
- }
-};
// ----------------------------------------------------------------------------
// locking
@@ -104,7 +87,7 @@ static struct config_option *appconfig_option_index_find(struct section *co, con
// ----------------------------------------------------------------------------
// config sections index
-static int appconfig_section_compare(void *a, void *b) {
+int appconfig_section_compare(void *a, void *b) {
if(((struct section *)a)->hash < ((struct section *)b)->hash) return -1;
else if(((struct section *)a)->hash > ((struct section *)b)->hash) return 1;
else return strcmp(((struct section *)a)->name, ((struct section *)b)->name);
@@ -445,7 +428,7 @@ int appconfig_load(struct config *root, char *filename, int overwrite_used)
FILE *fp = fopen(filename, "r");
if(!fp) {
- error("CONFIG: cannot open file '%s'", filename);
+ // info("CONFIG: cannot open file '%s'. Using internal defaults.", filename);
return 0;
}
@@ -493,10 +476,8 @@ int appconfig_load(struct config *root, char *filename, int overwrite_used)
error("CONFIG: ignoring line %d of file '%s', name is empty.", line, filename);
continue;
}
- if(!value) {
- debug(D_CONFIG, "CONFIG: ignoring line %d of file '%s', value is empty.", line, filename);
- continue;
- }
+
+ if(!value) value = "";
struct config_option *cv = appconfig_option_index_find(co, name, 0);
diff --git a/libnetdata/config/appconfig.h b/libnetdata/config/appconfig.h
new file mode 100644
index 000000000..6ac666d8b
--- /dev/null
+++ b/libnetdata/config/appconfig.h
@@ -0,0 +1,135 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+/*
+ * This section manages ini config files, like netdata.conf and stream.conf
+ *
+ * It is organized like this:
+ *
+ * struct config (i.e. netdata.conf or stream.conf)
+ * .sections = a linked list of struct section
+ * .mutex = a mutex to protect the above linked list due to multi-threading
+ * .index = an AVL tree of struct section
+ *
+ * struct section (i.e. [global] or [health] of netdata.conf)
+ * .value = a linked list of struct config_option
+ * .mutex = a mutex to protect the above linked list due to multi-threading
+ * .value_index = an AVL tree of struct config_option
+ *
+ * struct config_option (ie. a name-value pair for each ini file option)
+ *
+ * The following operations on name-value options are supported:
+ * SET to set the value of an option
+ * SET DEFAULT to set the value and the default value of an option
+ * GET to get the value of an option
+ * EXISTS to check if an option exists
+ * MOVE to move an option from a section to another section, and/or rename it
+ *
+ * GET and SET operations are provided for the following data types:
+ * STRING
+ * NUMBER (long long)
+ * FLOAT (long double)
+ * BOOLEAN (false, true)
+ * BOOLEAN ONDEMAND (false, true, auto)
+ *
+ * GET and SET operations create struct config_option, if it is not already present.
+ * This allows netdata to run even without netdata.conf and stream.conf. The internal
+ * defaults are used to create the structure that should exist in the ini file and the config
+ * file can be downloaded from the server.
+ *
+ * Also 2 operations are supported for the whole config file:
+ *
+ * LOAD To load the ini file from disk
+ * GENERATE To generate the ini file (this is used to download the ini file from the server)
+ *
+ * For each option (name-value pair), the system maintains 4 flags:
+ * LOADED to indicate that the value has been loaded from the file
+ * USED to indicate that netdata used the value
+ * CHANGED to indicate that the value has been changed from the loaded value or the internal default value
+ * CHECKED is used internally for optimization (to avoid an strcmp() every time GET is called).
+ *
+ * TODO:
+ * 1. The linked lists and the mutexes can be removed and the AVL trees can become DICTIONARY.
+ * This part of the code was written before we add traversal to AVL.
+ *
+ * 2. High level data types could be supported, to simplify the rest of the code:
+ * MULTIPLE CHOICE to let the user select one of the supported keywords
+ * this would allow users see in comments the available options
+ *
+ * SIMPLE PATTERN to let the user define netdata SIMPLE PATTERNS
+ *
+ * 3. Sorting of options should be supported.
+ * Today, when the ini file is downloaded from the server, the options are shown in the order
+ * they appear in the linked list (the order they were added, listing changed options first).
+ * If we remove the linked list, the order they appear in the AVL tree will be used (which is
+ * random due to simple_hash()).
+ * Ideally, we support sorting of options when generating the ini file.
+ *
+ * 4. There is no free() operation. So, memory is freed on netdata exit.
+ *
+ * 5. Avoid memory fragmentation
+ * Since entries are created from multiple threads and a lot of allocations are required
+ * for each config_option, fragmentation can be a problem for IoT.
+ *
+ * 6. Although this way of managing options is quite flexible and dynamic, it wastes memory
+ * for the names of the options. Since most of the option names are static, we could provide
+ * a method to allocate only the dynamic option names.
+ */
+
+#ifndef NETDATA_CONFIG_H
+#define NETDATA_CONFIG_H 1
+
+#include "../libnetdata.h"
+
+#define CONFIG_FILENAME "netdata.conf"
+
+#define CONFIG_SECTION_GLOBAL "global"
+#define CONFIG_SECTION_WEB "web"
+#define CONFIG_SECTION_STATSD "statsd"
+#define CONFIG_SECTION_PLUGINS "plugins"
+#define CONFIG_SECTION_REGISTRY "registry"
+#define CONFIG_SECTION_HEALTH "health"
+#define CONFIG_SECTION_BACKEND "backend"
+#define CONFIG_SECTION_STREAM "stream"
+
+// these are used to limit the configuration names and values lengths
+// they are not enforced by config.c functions (they will strdup() all strings, no matter of their length)
+#define CONFIG_MAX_NAME 1024
+#define CONFIG_MAX_VALUE 2048
+
+struct config {
+ struct section *sections;
+ netdata_mutex_t mutex;
+ avl_tree_lock index;
+};
+
+#define CONFIG_BOOLEAN_INVALID 100 // an invalid value to check for validity (used as default initialization when needed)
+
+#define CONFIG_BOOLEAN_NO 0 // disabled
+#define CONFIG_BOOLEAN_YES 1 // enabled
+
+#ifndef CONFIG_BOOLEAN_AUTO
+#define CONFIG_BOOLEAN_AUTO 2 // enabled if it has useful info when enabled
+#endif
+
+extern int appconfig_load(struct config *root, char *filename, int overwrite_used);
+
+extern char *appconfig_get(struct config *root, const char *section, const char *name, const char *default_value);
+extern long long appconfig_get_number(struct config *root, const char *section, const char *name, long long value);
+extern LONG_DOUBLE appconfig_get_float(struct config *root, const char *section, const char *name, LONG_DOUBLE value);
+extern int appconfig_get_boolean(struct config *root, const char *section, const char *name, int value);
+extern int appconfig_get_boolean_ondemand(struct config *root, const char *section, const char *name, int value);
+
+extern const char *appconfig_set(struct config *root, const char *section, const char *name, const char *value);
+extern const char *appconfig_set_default(struct config *root, const char *section, const char *name, const char *value);
+extern long long appconfig_set_number(struct config *root, const char *section, const char *name, long long value);
+extern LONG_DOUBLE appconfig_set_float(struct config *root, const char *section, const char *name, LONG_DOUBLE value);
+extern int appconfig_set_boolean(struct config *root, const char *section, const char *name, int value);
+
+extern int appconfig_exists(struct config *root, const char *section, const char *name);
+extern int appconfig_move(struct config *root, const char *section_old, const char *name_old, const char *section_new, const char *name_new);
+
+extern void appconfig_generate(struct config *root, BUFFER *wb, int only_changed);
+
+extern int appconfig_section_compare(void *a, void *b);
+
+#endif /* NETDATA_CONFIG_H */