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/* - mode: c; c-basic-offset: 2; indent-tabs-mode: nil; -*-
* vim:expandtab:shiftwidth=2:tabstop=2:smarttab:
*
* Copyright (C) 2011 Marcus Eriksson
*
* Authors:
*
* Marcus Eriksson <krummas@gmail.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; 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
*/
#include <config.h>
#include "zeromq_log.h"
#include <drizzled/message/transaction.pb.h>
#include <google/protobuf/io/coded_stream.h>
#include <stdio.h>
#include <drizzled/module/registry.h>
#include <drizzled/plugin.h>
#include <stdint.h>
#include <boost/program_options.hpp>
#include <drizzled/module/option_map.h>
#include <zmq.h>
namespace po= boost::program_options;
using namespace std;
using namespace drizzled;
using namespace google;
namespace drizzle_plugin
{
ZeroMQLog::ZeroMQLog(const string &name, const string &endpoint) :
plugin::TransactionApplier(name)
{
void *context= zmq_init(1);
_socket= zmq_socket (context, ZMQ_PUB);
assert (_socket);
int rc= zmq_bind (_socket, endpoint.c_str());
assert (rc == 0);
pthread_mutex_init(&publishLock, NULL);
}
ZeroMQLog::~ZeroMQLog()
{
zmq_close(_socket);
pthread_mutex_destroy(&publishLock);
}
plugin::ReplicationReturnCode
ZeroMQLog::apply(Session &, const message::Transaction &to_apply)
{
size_t message_byte_length= to_apply.ByteSize();
uint8_t* buffer= new uint8_t[message_byte_length];
if(buffer == NULL)
{
errmsg_printf(error::ERROR, _("Failed to allocate enough memory to transaction message\n"));
deactivate();
return plugin::UNKNOWN_ERROR;
}
string schema= getSchemaName(to_apply);
zmq_msg_t schemamsg;
int rc= zmq_msg_init_size(&schemamsg, schema.length());
memcpy(zmq_msg_data(&schemamsg), schema.c_str(), schema.length());
to_apply.SerializeWithCachedSizesToArray(buffer);
zmq_msg_t msg;
rc= zmq_msg_init_size(&msg, message_byte_length);
assert (rc == 0);
memcpy(zmq_msg_data(&msg), buffer, message_byte_length);
// need a mutex around this since several threads can call this method at the same time
pthread_mutex_lock(&publishLock);
rc= zmq_send(_socket, &schemamsg, ZMQ_SNDMORE);
rc= zmq_send(_socket, &msg, 0);
pthread_mutex_unlock(&publishLock);
zmq_msg_close(&msg);
zmq_msg_close(&schemamsg);
delete[] buffer;
return plugin::SUCCESS;
}
string ZeroMQLog::getSchemaName(const message::Transaction &txn) {
if(txn.statement_size() == 0) return "";
const message::Statement &statement= txn.statement(0);
switch(statement.type())
{
case message::Statement::INSERT:
return statement.insert_header().table_metadata().schema_name();
case message::Statement::UPDATE:
return statement.update_header().table_metadata().schema_name();
case message::Statement::DELETE:
return statement.delete_header().table_metadata().schema_name();
case message::Statement::CREATE_TABLE:
return statement.create_table_statement().table().schema();
case message::Statement::TRUNCATE_TABLE:
return statement.truncate_table_statement().table_metadata().schema_name();
case message::Statement::DROP_TABLE:
return statement.drop_table_statement().table_metadata().schema_name();
case message::Statement::CREATE_SCHEMA:
return statement.create_schema_statement().schema().name();
case message::Statement::DROP_SCHEMA:
return statement.drop_schema_statement().schema_name();
default:
return "";
}
}
static ZeroMQLog *zeromqLogger; ///< the actual plugin
/**
* Initialize the zeromq logger
*/
static int init(drizzled::module::Context &context)
{
const module::option_map &vm= context.getOptions();
zeromqLogger= new ZeroMQLog("zeromq_log_applier", vm["endpoint"].as<string>());
context.add(zeromqLogger);
ReplicationServices::attachApplier(zeromqLogger, vm["use-replicator"].as<string>());
context.registerVariable(new sys_var_const_string_val("endpoint", vm["endpoint"].as<string>()));
return 0;
}
static void init_options(drizzled::module::option_context &context)
{
context("endpoint",
po::value<string>()->default_value("tcp://*:9999"),
_("End point to bind to"));
context("use-replicator",
po::value<string>()->default_value("default_replicator"),
_("Name of the replicator plugin to use (default='default_replicator')"));
}
} /* namespace drizzle_plugin */
DRIZZLE_PLUGIN(drizzle_plugin::init, NULL, drizzle_plugin::init_options);
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