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Diffstat (limited to 'sql/rpl_injector.cc')
| -rw-r--r-- | sql/rpl_injector.cc | 197 |
1 files changed, 197 insertions, 0 deletions
diff --git a/sql/rpl_injector.cc b/sql/rpl_injector.cc new file mode 100644 index 00000000..3080d92b --- /dev/null +++ b/sql/rpl_injector.cc @@ -0,0 +1,197 @@ +/* Copyright (c) 2006, 2011, Oracle and/or its affiliates. + + 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 02110-1335 USA */ + +#include "mariadb.h" +#include "sql_priv.h" +#include "rpl_injector.h" +#include "transaction.h" +#include "sql_parse.h" // begin_trans, end_trans, COMMIT +#include "sql_base.h" // close_thread_tables +#include "log_event.h" // Incident_log_event + +/* + injector::transaction - member definitions +*/ + +/* inline since it's called below */ +inline +injector::transaction::transaction(MYSQL_BIN_LOG *log, THD *thd) + : m_state(START_STATE), m_thd(thd) +{ + /* + Default initialization of m_start_pos (which initializes it to garbage). + We need to fill it in using the code below. + */ + LOG_INFO log_info; + log->get_current_log(&log_info); + /* !!! binlog_pos does not follow RAII !!! */ + m_start_pos.m_file_name= my_strdup(key_memory_binlog_pos, + log_info.log_file_name, MYF(0)); + m_start_pos.m_file_pos= log_info.pos; + + m_thd->lex->start_transaction_opt= 0; /* for begin_trans() */ + trans_begin(m_thd); +} + +injector::transaction::~transaction() +{ + if (!good()) + return; + + /* Needed since my_free expects a 'char*' (instead of 'void*'). */ + char* const the_memory= const_cast<char*>(m_start_pos.m_file_name); + + /* + We set the first character to null just to give all the copies of the + start position a (minimal) chance of seening that the memory is lost. + All assuming the my_free does not step over the memory, of course. + */ + *the_memory= '\0'; + + my_free(the_memory); +} + +/** + @retval 0 transaction committed + @retval 1 transaction rolled back + */ +int injector::transaction::commit() +{ + DBUG_ENTER("injector::transaction::commit()"); + int error= m_thd->binlog_flush_pending_rows_event(true); + /* + Cluster replication does not preserve statement or + transaction boundaries of the master. Instead, a new + transaction on replication slave is started when a new GCI + (global checkpoint identifier) is issued, and is committed + when the last event of the check point has been received and + processed. This ensures consistency of each cluster in + cluster replication, and there is no requirement for stronger + consistency: MySQL replication is asynchronous with other + engines as well. + + A practical consequence of that is that row level replication + stream passed through the injector thread never contains + COMMIT events. + Here we should preserve the server invariant that there is no + outstanding statement transaction when the normal transaction + is committed by committing the statement transaction + explicitly. + */ + trans_commit_stmt(m_thd); + if (!trans_commit(m_thd)) + { + close_thread_tables(m_thd); + m_thd->release_transactional_locks(); + } + DBUG_RETURN(error); +} + + +#ifdef TO_BE_DELETED +int injector::transaction::use_table(server_id_type sid, table tbl) +{ + DBUG_ENTER("injector::transaction::use_table"); + + int error; + + if (unlikely((error= check_state(TABLE_STATE)))) + DBUG_RETURN(error); + + server_id_type save_id= m_thd->variables.server_id; + m_thd->set_server_id(sid); + DBUG_ASSERT(tbl.is_transactional() == tbl.get_table()->file->row_logging_has_trans); + error= m_thd->binlog_write_table_map(tbl.get_table(), 0); + m_thd->set_server_id(save_id); + DBUG_RETURN(error); +} +#endif + + +injector::transaction::binlog_pos injector::transaction::start_pos() const +{ + return m_start_pos; +} + + +/* + injector - member definitions +*/ + +/* This constructor is called below */ +inline injector::injector() = default; + +static injector *s_injector= 0; +injector *injector::instance() +{ + if (s_injector == 0) + s_injector= new injector; + /* "There can be only one [instance]" */ + return s_injector; +} + +void injector::free_instance() +{ + injector *inj = s_injector; + + if (inj != 0) + { + s_injector= 0; + delete inj; + } +} + + +injector::transaction injector::new_trans(THD *thd) +{ + DBUG_ENTER("injector::new_trans(THD*)"); + /* + Currently, there is no alternative to using 'mysql_bin_log' since that + is hardcoded into the way the handler is using the binary log. + */ + DBUG_RETURN(transaction(&mysql_bin_log, thd)); +} + +void injector::new_trans(THD *thd, injector::transaction *ptr) +{ + DBUG_ENTER("injector::new_trans(THD *, transaction *)"); + /* + Currently, there is no alternative to using 'mysql_bin_log' since that + is hardcoded into the way the handler is using the binary log. + */ + transaction trans(&mysql_bin_log, thd); + ptr->swap(trans); + + DBUG_VOID_RETURN; +} + +int injector::record_incident(THD *thd, Incident incident) +{ + Incident_log_event ev(thd, incident); + int error; + if (unlikely((error= mysql_bin_log.write(&ev)))) + return error; + return mysql_bin_log.rotate_and_purge(true); +} + +int injector::record_incident(THD *thd, Incident incident, + const LEX_CSTRING *message) +{ + Incident_log_event ev(thd, incident, message); + int error; + if (unlikely((error= mysql_bin_log.write(&ev)))) + return error; + return mysql_bin_log.rotate_and_purge(true); +} |