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/* Copyright (C) 2015-2019 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. */
#ifndef WSREP_SCHEMA_H
#define WSREP_SCHEMA_H
/* wsrep-lib */
#include "wsrep_types.h"
#include "mysqld.h"
#include "wsrep_mysqld.h"
/*
Forward decls
*/
class THD;
class Relay_log_info;
struct TABLE;
struct TABLE_LIST;
struct st_mysql_lex_string;
typedef struct st_mysql_lex_string LEX_STRING;
/** Name of the table in `wsrep_schema_str` used for storing streaming
replication data. In an InnoDB full format, e.g. "database/tablename". */
extern const char* wsrep_sr_table_name_full;
class Wsrep_schema
{
public:
Wsrep_schema();
~Wsrep_schema();
/*
Initialize wsrep schema. Storage engines must be running before
calling this function.
*/
int init();
/*
Store wsrep view info into wsrep schema.
*/
int store_view(THD*, const Wsrep_view& view);
/*
Restore view info from stable storage.
*/
Wsrep_view restore_view(THD* thd, const Wsrep_id& own_id) const;
/**
Append transaction fragment to fragment storage.
Transaction must have been started for THD before this call.
In order to make changes durable, transaction must be committed
separately after this call.
@param thd THD object
@param server_id Wsrep server identifier
@param transaction_id Transaction identifier
@param flags Flags for the fragment
@param data Fragment data buffer
@return Zero in case of success, non-zero on failure.
*/
int append_fragment(THD* thd,
const wsrep::id& server_id,
wsrep::transaction_id transaction_id,
wsrep::seqno seqno,
int flags,
const wsrep::const_buffer& data);
/**
Update existing fragment meta data. The fragment must have been
inserted before using append_fragment().
@param thd THD object
@param ws_meta Wsrep meta data
@return Zero in case of success, non-zero on failure.
*/
int update_fragment_meta(THD* thd,
const wsrep::ws_meta& ws_meta);
/**
Remove fragments from storage. This method must be called
inside active transaction. Fragment removal will be committed
once the transaction commits.
@param thd Pointer to THD object
@param server_id Identifier of the running server
@param transaction_id Identifier of the current transaction
@param fragments Vector of fragment seqnos to be removed
*/
int remove_fragments(THD* thd,
const wsrep::id& server_id,
wsrep::transaction_id transaction_id,
const std::vector<wsrep::seqno>& fragments);
/**
Replay a transaction from stored fragments. The caller must have
started a transaction for a thd.
@param thd Pointer to THD object
@param ws_meta Write set meta data for commit fragment.
@param fragments Vector of fragments to be replayed
@return Zero on success, non-zero on failure.
*/
int replay_transaction(THD* thd,
Relay_log_info* rli,
const wsrep::ws_meta& ws_meta,
const std::vector<wsrep::seqno>& fragments);
/**
Recover streaming transactions from SR table.
This method should be called after storage enignes are initialized.
It will scan SR table and replay found streaming transactions.
@param orig_thd The THD object of the calling thread.
@return Zero on success, non-zero on failure.
*/
int recover_sr_transactions(THD* orig_thd);
private:
/* Non-copyable */
Wsrep_schema(const Wsrep_schema&);
Wsrep_schema& operator=(const Wsrep_schema&);
};
extern Wsrep_schema* wsrep_schema;
#endif /* !WSREP_SCHEMA_H */
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