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/* - mode: c; c-basic-offset: 2; indent-tabs-mode: nil; -*-
* vim:expandtab:shiftwidth=2:tabstop=2:smarttab:
*
* Copyright (C) 2009 Sun Microsystems, Inc.
*
* 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 St, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
* @file
*
* Defines the API of a simple filtered replicator.
*
* @see drizzled/plugin/transaction_replicator.h
* @see drizzled/plugin/transaction_applier.h
*/
#pragma once
#include <drizzled/atomics.h>
#include <drizzled/plugin/transaction_replicator.h>
#include PCRE_HEADER
#include <vector>
#include <string>
namespace drizzle_plugin
{
class FilteredReplicator :
public drizzled::plugin::TransactionReplicator
{
public:
FilteredReplicator(std::string name_arg,
const std::string &sch_filter,
const std::string &tab_filter,
const std::string &sch_regex,
const std::string &tab_regex);
/** Destructor */
~FilteredReplicator();
/**
* Replicate a Transaction message to an Applier.
*
* @note
*
* It is important to note that memory allocation for the
* supplied pointer is not guaranteed after the completion
* of this function -- meaning the caller can dispose of the
* supplied message. Therefore, replicators and appliers
* implementing an asynchronous replication system must copy
* the supplied message to their own controlled memory storage
* area.
*
* @param Applier to replicate to
* @param Session descriptor
* @param Transaction message to be replicated
*/
drizzled::plugin::ReplicationReturnCode
replicate(drizzled::plugin::TransactionApplier *in_applier,
drizzled::Session &in_session,
drizzled::message::Transaction &to_replicate);
/**
* Populate the vector of schemas to filter from the
* comma-separated list of schemas given. This method
* clears the vector first.
*
* @param[in] input comma-separated filter to use
*/
void setSchemaFilter(const std::string &input);
/**
* @return string of comma-separated list of schemas to filter
*/
const std::string &getSchemaFilter() const
{
return _sch_filter;
}
/**
* Populate the vector of tables to filter from the
* comma-separated list of tables given. This method
* clears the vector first.
*
* @param[in] input comma-separated filter to use
*/
void setTableFilter(const std::string &input);
/**
* @return string of comma-separated list of tables to filter
*/
const std::string &getTableFilter() const
{
return _tab_filter;
}
/**
* Update the given system variable and release the mutex
* associated with this system variable.
*
* @param[out] var_ptr the system variable to update
*/
void updateTableSysvar(const char **var_ptr)
{
*var_ptr= _tab_filter.c_str();
pthread_mutex_unlock(&sysvar_tab_lock);
}
/**
* Update the given system variable and release the mutex
* associated with this system variable.
*
* @param[out] var_ptr the system variable to update
*/
void updateSchemaSysvar(const char **var_ptr)
{
*var_ptr= _sch_filter.c_str();
pthread_mutex_unlock(&sysvar_sch_lock);
}
private:
/**
* Given a comma-separated string, parse that string to obtain
* each entry and add each entry to the supplied vector.
*
* @param[in] input a comma-separated string of entries
* @param[out] filter a std::vector to be populated with the entries
* from the input string
*/
void populateFilter(std::string input,
std::vector<std::string> &filter);
/**
* Search the vector of schemas to filter to determine whether
* the given schema should be filtered or not. The parameter
* is obtained from the Transaction message passed to the replicator.
*
* @param[in] schema_name name of schema to search for
* @return true if the given schema should be filtered; false otherwise
*/
bool isSchemaFiltered(const std::string &schema_name);
/**
* Search the vector of tables to filter to determine whether
* the given table should be filtered or not. The parameter
* is obtained from the Transaction message passed to the replicator.
*
* @param[in] table_name name of table to search for
* @return true if the given table should be filtered; false otherwise
*/
bool isTableFiltered(const std::string &table_name);
/**
* Given a supplied Statement message, parse out the table
* and schema name from the various metadata and header
* pieces for the different Statement types.
*
* @param[in] Statement to parse
* @param[out] Schema name to fill
* @param[out] Table name to fill
*/
void parseStatementTableMetadata(const drizzled::message::Statement &in_statement,
std::string &in_schema_name,
std::string &in_table_name) const;
/**
* If the command message consists of raw SQL, this method parses
* a string representation of the raw SQL and extracts the schema
* name and table name from that raw SQL.
*
* @param[in] sql std::string representation of the raw SQL
* @param[out] schema_name parameter to be populated with the
* schema name from the parsed SQL
* @param[out] table_name parameter to be populated with the table
* name from the parsed SQL
*/
void parseQuery(const std::string &sql,
std::string &schema_name,
std::string &table_name);
/*
* Vectors of the tables and schemas to filter.
*/
std::vector<std::string> schemas_to_filter;
std::vector<std::string> tables_to_filter;
/*
* Variables to contain the string representation of the
* comma-separated lists of schemas and tables to filter.
*/
std::string _sch_filter;
std::string _tab_filter;
const std::string _sch_regex;
const std::string _tab_regex;
/*
* We need locks to protect the vectors when they are
* being updated and accessed. It would be nice to use
* r/w locks here since the vectors will mostly be
* accessed in a read-only fashion and will be only updated
* rarely.
*/
pthread_mutex_t sch_vector_lock;
pthread_mutex_t tab_vector_lock;
/*
* We need a lock to protect the system variables
* that can be updated. We have a lock for each
* system variable.
*/
pthread_mutex_t sysvar_sch_lock;
pthread_mutex_t sysvar_tab_lock;
pcre *sch_re;
pcre *tab_re;
};
} /* namespace drizzle_plugin */
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