~drizzle-trunk/drizzle/development

/* - mode: c; c-basic-offset: 2; indent-tabs-mode: nil; -*-

 *  vim:expandtab:shiftwidth=2:tabstop=2:smarttab:

 *

 *  Copyright (C) 2010 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 "rabbitmq_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 "rabbitmq_handler.h"

#include <boost/program_options.hpp>

#include <drizzled/module/option_map.h>

namespace po= boost::program_options;

using namespace std;

using namespace drizzled;

using namespace google;

namespace drizzle_plugin

{

/**

 * rabbitmq port

 */

static port_constraint sysvar_rabbitmq_port;

RabbitMQLog::RabbitMQLog(const string &name, 

                         const std::string &exchange,

                         const std::string &routingkey,

                         RabbitMQHandler* mqHandler) :

  plugin::TransactionApplier(name),

  _rabbitMQHandler(mqHandler),

  _exchange(exchange),

  _routingkey(routingkey)

{ }

RabbitMQLog::~RabbitMQLog() 

{ }

plugin::ReplicationReturnCode

RabbitMQLog::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;

  }

  to_apply.SerializeWithCachedSizesToArray(buffer);

  try

  {

    _rabbitMQHandler->publish(buffer, 

                             int(message_byte_length), 

                             _exchange,

                             _routingkey);

  }

  catch(exception& e)

  {

    errmsg_printf(error::ERROR, _(e.what()));

    deactivate();

    return plugin::UNKNOWN_ERROR;

  }

  delete[] buffer;

  return plugin::SUCCESS;

}

static RabbitMQLog *rabbitmqLogger; ///< the actual plugin

static RabbitMQHandler* rabbitmqHandler; ///< the rabbitmq handler

/**

 * Initialize the rabbitmq logger - instanciates the dependencies (the handler)

 * and creates the log handler with the dependency - makes it easier to swap out

 * handler implementation

 */

static int init(drizzled::module::Context &context)

{

  const module::option_map &vm= context.getOptions();

  try 

  {

    rabbitmqHandler= new RabbitMQHandler(vm["host"].as<string>(),

                                         sysvar_rabbitmq_port, 

                                         vm["username"].as<string>(), 

                                         vm["password"].as<string>(), 

                                         vm["virtualhost"].as<string>());

  } 

  catch (exception& e) 

  {

    errmsg_printf(error::ERROR, _("Failed to allocate the RabbitMQHandler.  Got error: %s\n"),

                  e.what());

    return 1;

  }

  try 

  {

    rabbitmqLogger= new RabbitMQLog("rabbit_log_applier",

                                    vm["exchange"].as<string>(),

                                    vm["routingkey"].as<string>(),

                                    rabbitmqHandler);

  } 

  catch (exception& e) 

  {

    errmsg_printf(error::ERROR, _("Failed to allocate the RabbitMQLog instance.  Got error: %s\n"), 

                  e.what());

    return 1;

  }

  context.add(rabbitmqLogger);

  ReplicationServices &replication_services= ReplicationServices::singleton();

  replication_services.attachApplier(rabbitmqLogger, vm["use-replicator"].as<string>());

  context.registerVariable(new sys_var_const_string_val("host", vm["host"].as<string>()));

  context.registerVariable(new sys_var_constrained_value_readonly<in_port_t>("port", sysvar_rabbitmq_port));

  context.registerVariable(new sys_var_const_string_val("username", vm["username"].as<string>()));

  context.registerVariable(new sys_var_const_string_val("password", vm["password"].as<string>()));

  context.registerVariable(new sys_var_const_string_val("virtualhost", vm["virtualhost"].as<string>()));

  context.registerVariable(new sys_var_const_string_val("exchange", vm["exchange"].as<string>()));

  context.registerVariable(new sys_var_const_string_val("routingkey", vm["routingkey"].as<string>()));

  return 0;

}

static void init_options(drizzled::module::option_context &context)

{

  context("host", 

          po::value<string>()->default_value("localhost"),

          _("Host name to connect to"));

  context("port",

          po::value<port_constraint>(&sysvar_rabbitmq_port)->default_value(5672),

          _("Port to connect to"));

  context("virtualhost",

          po::value<string>()->default_value("/"),

          _("RabbitMQ virtualhost"));

  context("username",

          po::value<string>()->default_value("guest"),

          _("RabbitMQ username"));

  context("password",

          po::value<string>()->default_value("guest"),

          _("RabbitMQ password"));

  context("use-replicator",

          po::value<string>()->default_value("default_replicator"),

          _("Name of the replicator plugin to use (default='default_replicator')"));

  context("exchange",

          po::value<string>()->default_value("ReplicationExchange"),

          _("Name of RabbitMQ exchange to publish to"));

  context("routingkey",

          po::value<string>()->default_value("ReplicationRoutingKey"),

          _("Name of RabbitMQ routing key to use"));

}

} /* namespace drizzle_plugin */

DRIZZLE_PLUGIN(drizzle_plugin::init, NULL, drizzle_plugin::init_options);