~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 <drizzled/gettext.h>

#include "rabbitmq_handler.h"

using namespace std;

namespace drizzle_plugin

{

RabbitMQHandler::RabbitMQHandler(const std::string &rabbitMQHost, 

                                 const in_port_t rabbitMQPort, 

                                 const std::string &rabbitMQUsername, 

                                 const std::string &rabbitMQPassword, 

                                 const std::string &rabbitMQVirtualhost, 

				 const std::string &rabbitMQExchange, 

				 const std::string &rabbitMQRoutingKey) 

  throw(rabbitmq_handler_exception) :

    rabbitmqConnection(amqp_new_connection()),

    hostname(rabbitMQHost),

    port(rabbitMQPort),

    username(rabbitMQUsername),

    password(rabbitMQPassword),

    virtualhost(rabbitMQVirtualhost),

    exchange(rabbitMQExchange), 

    routingKey(rabbitMQRoutingKey)

{

  pthread_mutex_init(&publishLock, NULL);

  connect();

}

RabbitMQHandler::~RabbitMQHandler()

{

  pthread_mutex_destroy(&publishLock);

  disconnect();

}

void RabbitMQHandler::publish(void *message, 

                              const int length)

throw(rabbitmq_handler_exception)

{

  pthread_mutex_lock(&publishLock);

  amqp_bytes_t b;

  b.bytes= message;

  b.len= length;

  if (amqp_basic_publish(rabbitmqConnection,

                         1,

                         amqp_cstring_bytes(exchange.c_str()),

                         amqp_cstring_bytes(routingKey.c_str()),

                         0,

                         0,

                         NULL,

                         b) < 0)

  {

    pthread_mutex_unlock(&publishLock);

    throw rabbitmq_handler_exception("Could not publish message");

  }

  pthread_mutex_unlock(&publishLock);

}

void RabbitMQHandler::reconnect() throw(rabbitmq_handler_exception)

{

  disconnect();

  connect();

}

void RabbitMQHandler::disconnect() throw(rabbitmq_handler_exception) 

{

  try

  {

    handleAMQPError(amqp_channel_close(rabbitmqConnection, 

				       1, 

				       AMQP_REPLY_SUCCESS),

		    "close channel");

    handleAMQPError(amqp_connection_close(rabbitmqConnection, 

					  AMQP_REPLY_SUCCESS),

		    "close connection");

    amqp_destroy_connection(rabbitmqConnection);

  }

  catch(exception& e) {} // do not throw in destructorn 

  close(sockfd);

}

void RabbitMQHandler::connect() throw(rabbitmq_handler_exception) {

  sockfd = amqp_open_socket(hostname.c_str(), port);

  if(sockfd < 0) 

  {

    throw rabbitmq_handler_exception(_("Could not open socket, is rabbitmq running?"));

  }

  amqp_set_sockfd(rabbitmqConnection, sockfd);

  /* login to rabbitmq, handleAMQPError throws exception if there is a problem */

  handleAMQPError(amqp_login(rabbitmqConnection, 

                             virtualhost.c_str(), 

                             0, 

                             131072, 

                             0, 

                             AMQP_SASL_METHOD_PLAIN, 

                             username.c_str(), 

                             password.c_str()), 

                  "rabbitmq login");

  /* open the channel */

  amqp_channel_open(rabbitmqConnection, 1);

  handleAMQPError(amqp_get_rpc_reply(rabbitmqConnection), "RPC Reply");

  amqp_table_t empty_table = { 0, NULL }; // for users of old librabbitmq users - amqp_empty_table did not exist

  amqp_exchange_declare(rabbitmqConnection, 1, amqp_cstring_bytes(exchange.c_str()), amqp_cstring_bytes("fanout"), 0, 0, empty_table);

  handleAMQPError(amqp_get_rpc_reply(rabbitmqConnection), "RPC Reply");

}

void RabbitMQHandler::handleAMQPError(amqp_rpc_reply_t x, string context) throw(rabbitmq_handler_exception)

{

  string errorMessage("");

  switch (x.reply_type) {

  case AMQP_RESPONSE_NORMAL:

    break;

  case AMQP_RESPONSE_NONE:

    errorMessage.assign("No response in ");

    errorMessage.append(context);

    throw rabbitmq_handler_exception(errorMessage);

  case AMQP_RESPONSE_LIBRARY_EXCEPTION:

  case AMQP_RESPONSE_SERVER_EXCEPTION:

    switch (x.reply.id) {      

    case AMQP_CONNECTION_CLOSE_METHOD:

      errorMessage.assign("Connection closed in ");

      errorMessage.append(context);

      throw rabbitmq_handler_exception(errorMessage);

    case AMQP_CHANNEL_CLOSE_METHOD:

      errorMessage.assign("Channel closed in ");

      errorMessage.append(context);

      throw rabbitmq_handler_exception(errorMessage);

    default:

      errorMessage.assign("Unknown error in ");

      errorMessage.append(context);

      throw rabbitmq_handler_exception(errorMessage);

    }

  }

}

} /* namespace drizzle_plugin */