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Viewing changes to plugin/rabbitmq/rabbitmq_log.cc

  • Committer: Devananda
  • Date: 2009-07-04 01:55:13 UTC
  • mto: (1086.10.1 length-plugin)
  • mto: This revision was merged to the branch mainline in revision 1095.
  • Revision ID: deva@myst-20090704015513-gtqliazxtfm7sdvf
refactored function/length into plugin/length

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plugin/rabbitmq/rabbitmq_log.cc
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/* - mode: c; c-basic-offset: 2; indent-tabs-mode: nil; -*-
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 *  vim:expandtab:shiftwidth=2:tabstop=2:smarttab:
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 *
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 *  Copyright (C) 2010 Marcus Eriksson
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 *
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 *  Authors:
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 *
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 *  Marcus Eriksson <krummas@gmail.com>
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 *
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 *  This program is free software; you can redistribute it and/or modify
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 *  it under the terms of the GNU General Public License as published by
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 *  the Free Software Foundation; either version 2 of the License, or
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 *  (at your option) any later version.
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 *
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 *  This program is distributed in the hope that it will be useful,
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 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
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 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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 *  GNU General Public License for more details.
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 *
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 *  You should have received a copy of the GNU General Public License
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 *  along with this program; if not, write to the Free Software
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 *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
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 */
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#include "config.h"
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#include "rabbitmq_log.h"
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#include <drizzled/message/transaction.pb.h>
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#include <google/protobuf/io/coded_stream.h>
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#include <stdio.h>
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#include <drizzled/module/registry.h>
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#include <drizzled/plugin.h>
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#include <stdint.h>
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#include "rabbitmq_handler.h"
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#include <boost/program_options.hpp>
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#include <drizzled/module/option_map.h>
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namespace po= boost::program_options;
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using namespace std;
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using namespace drizzled;
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using namespace google;
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namespace drizzle_plugin
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{
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/**
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 * rabbitmq port
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 */
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static port_constraint sysvar_rabbitmq_port;
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RabbitMQLog::RabbitMQLog(const string &name, 
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                         const std::string &exchange,
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                         const std::string &routingkey,
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                         RabbitMQHandler* mqHandler) :
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  plugin::TransactionApplier(name),
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  _rabbitMQHandler(mqHandler),
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  _exchange(exchange),
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  _routingkey(routingkey)
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{ }
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RabbitMQLog::~RabbitMQLog() 
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{ }
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plugin::ReplicationReturnCode
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RabbitMQLog::apply(Session &, const message::Transaction &to_apply)
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{
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  size_t message_byte_length= to_apply.ByteSize();
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  uint8_t* buffer= new uint8_t[message_byte_length];
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  if(buffer == NULL)
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  {
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    errmsg_printf(error::ERROR, _("Failed to allocate enough memory to transaction message\n"));
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    deactivate();
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    return plugin::UNKNOWN_ERROR;
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  }
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  to_apply.SerializeWithCachedSizesToArray(buffer);
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  try
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  {
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    _rabbitMQHandler->publish(buffer, 
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                             int(message_byte_length), 
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                             _exchange,
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                             _routingkey);
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  }
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  catch(exception& e)
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  {
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    errmsg_printf(error::ERROR, _(e.what()));
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    deactivate();
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    return plugin::UNKNOWN_ERROR;
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  }
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  delete[] buffer;
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  return plugin::SUCCESS;
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}
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static RabbitMQLog *rabbitmqLogger; ///< the actual plugin
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static RabbitMQHandler* rabbitmqHandler; ///< the rabbitmq handler
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/**
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 * Initialize the rabbitmq logger - instanciates the dependencies (the handler)
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 * and creates the log handler with the dependency - makes it easier to swap out
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 * handler implementation
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 */
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static int init(drizzled::module::Context &context)
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{
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  const module::option_map &vm= context.getOptions();
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  try 
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  {
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    rabbitmqHandler= new RabbitMQHandler(vm["host"].as<string>(),
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                                         sysvar_rabbitmq_port, 
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                                         vm["username"].as<string>(), 
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                                         vm["password"].as<string>(), 
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                                         vm["virtualhost"].as<string>());
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  } 
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  catch (exception& e) 
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  {
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    errmsg_printf(error::ERROR, _("Failed to allocate the RabbitMQHandler.  Got error: %s\n"),
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                  e.what());
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    return 1;
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  }
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  try 
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  {
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    rabbitmqLogger= new RabbitMQLog("rabbit_log_applier",
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                                    vm["exchange"].as<string>(),
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                                    vm["routingkey"].as<string>(),
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                                    rabbitmqHandler);
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  } 
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  catch (exception& e) 
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  {
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    errmsg_printf(error::ERROR, _("Failed to allocate the RabbitMQLog instance.  Got error: %s\n"), 
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                  e.what());
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    return 1;
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  }
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  context.add(rabbitmqLogger);
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  ReplicationServices &replication_services= ReplicationServices::singleton();
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  replication_services.attachApplier(rabbitmqLogger, vm["use-replicator"].as<string>());
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  context.registerVariable(new sys_var_const_string_val("host", vm["host"].as<string>()));
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  context.registerVariable(new sys_var_constrained_value_readonly<in_port_t>("port", sysvar_rabbitmq_port));
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  context.registerVariable(new sys_var_const_string_val("username", vm["username"].as<string>()));
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  context.registerVariable(new sys_var_const_string_val("password", vm["password"].as<string>()));
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  context.registerVariable(new sys_var_const_string_val("virtualhost", vm["virtualhost"].as<string>()));
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  context.registerVariable(new sys_var_const_string_val("exchange", vm["exchange"].as<string>()));
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  context.registerVariable(new sys_var_const_string_val("routingkey", vm["routingkey"].as<string>()));
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  return 0;
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}
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151
 
static void init_options(drizzled::module::option_context &context)
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{
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  context("host", 
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          po::value<string>()->default_value("localhost"),
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          _("Host name to connect to"));
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  context("port",
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          po::value<port_constraint>(&sysvar_rabbitmq_port)->default_value(5672),
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          _("Port to connect to"));
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  context("virtualhost",
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          po::value<string>()->default_value("/"),
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          _("RabbitMQ virtualhost"));
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  context("username",
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          po::value<string>()->default_value("guest"),
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          _("RabbitMQ username"));
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  context("password",
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          po::value<string>()->default_value("guest"),
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          _("RabbitMQ password"));
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  context("use-replicator",
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          po::value<string>()->default_value("default_replicator"),
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          _("Name of the replicator plugin to use (default='default_replicator')"));
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  context("exchange",
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          po::value<string>()->default_value("ReplicationExchange"),
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          _("Name of RabbitMQ exchange to publish to"));
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  context("routingkey",
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          po::value<string>()->default_value("ReplicationRoutingKey"),
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          _("Name of RabbitMQ routing key to use"));
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}
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} /* namespace drizzle_plugin */
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DRIZZLE_PLUGIN(drizzle_plugin::init, NULL, drizzle_plugin::init_options);
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