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  • Committer: Padraig O'Sullivan
  • Date: 2010-04-17 01:38:47 UTC
  • mfrom: (1237.9.238 bad-staging)
  • Revision ID: osullivan.padraig@gmail.com-20100417013847-ibjioqsfbmf5yg4g
Merge trunk.

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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
 
5
 *
 
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 *  Authors:
 
7
 *
 
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 *  Marcus Eriksson <krummas@gmail.com>
 
9
 *
 
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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.
 
19
 *
 
20
 *  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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 */
 
24
 
 
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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/plugin/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"
 
34
 
 
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using namespace std;
 
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using namespace drizzled;
 
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using namespace google;
 
38
 
 
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/**
 
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 * The hostname to connect to
 
41
 */
 
42
static char* sysvar_rabbitmq_host= NULL;
 
43
 
 
44
/**
 
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 * rabbitmq port
 
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 */
 
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static int sysvar_rabbitmq_port= 0;
 
48
 
 
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/**
 
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 * rabbitmq username
 
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 */
 
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static char* sysvar_rabbitmq_username= NULL;
 
53
 
 
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/**
 
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 * rabbitmq password
 
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 */
 
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static char* sysvar_rabbitmq_password= NULL;
 
58
 
 
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/**
 
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 * rabbitmq virtualhost
 
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 */
 
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static char* sysvar_rabbitmq_virtualhost= NULL;
 
63
 
 
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/**
 
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 * rabbitmq exchangename
 
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 */
 
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static char* sysvar_rabbitmq_exchange= NULL;
 
68
 
 
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/**
 
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 * rabbitmq routing key
 
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 */
 
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static char* sysvar_rabbitmq_routingkey= NULL;
 
73
 
 
74
/**
 
75
 * Is the rabbitmq log enabled?
 
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 */
 
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static bool sysvar_rabbitmq_log_enabled= false;
 
78
 
 
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/**
 
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 * The name of the replicator plugin
 
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 * to pair the rabbitmq log's applier with.
 
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 * Defaults to "default"
 
83
 */
 
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static char *sysvar_rabbitmq_use_replicator= NULL;
 
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static const char DEFAULT_USE_REPLICATOR[]= "default";
 
86
 
 
87
 
 
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RabbitMQLog::RabbitMQLog(const string name_arg, 
 
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                         RabbitMQHandler* mqHandler)
 
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  :plugin::TransactionApplier(name_arg)
 
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{
 
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  rabbitMQHandler= mqHandler;
 
93
}
 
94
 
 
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RabbitMQLog::~RabbitMQLog() 
 
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{
 
97
}
 
98
 
 
99
plugin::ReplicationReturnCode
 
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RabbitMQLog::apply(Session &, const message::Transaction &to_apply)
 
101
{
 
102
  size_t message_byte_length= to_apply.ByteSize();
 
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  uint8_t* buffer= static_cast<uint8_t *>(malloc(message_byte_length));
 
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  if(buffer == NULL)
 
105
  {
 
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    errmsg_printf(ERRMSG_LVL_ERROR, _("Failed to allocate enough memory to transaction message\n"));
 
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    deactivate();
 
108
    return plugin::UNKNOWN_ERROR;
 
109
  }
 
110
 
 
111
  to_apply.SerializeWithCachedSizesToArray(buffer);
 
112
  try
 
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  {
 
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    rabbitMQHandler->publish(buffer, 
 
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                             int(message_byte_length), 
 
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                             sysvar_rabbitmq_exchange, 
 
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                             sysvar_rabbitmq_routingkey);
 
118
  }
 
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  catch(exception& e)
 
120
  {
 
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    errmsg_printf(ERRMSG_LVL_ERROR, _(e.what()));
 
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    deactivate();
 
123
    return plugin::UNKNOWN_ERROR;
 
124
  }
 
125
  free(buffer);
 
126
  return plugin::SUCCESS;
 
127
}
 
128
 
 
129
static RabbitMQLog *rabbitmqLogger; ///< the actual plugin
 
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static RabbitMQHandler* rabbitmqHandler; ///< the rabbitmq handler
 
131
 
 
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/**
 
133
 * 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
 
135
 * handler implementation
 
136
 */
 
137
static int init(drizzled::plugin::Context &context)
 
138
{
 
139
  if(sysvar_rabbitmq_log_enabled)
 
140
  {
 
141
    try 
 
142
    {
 
143
      rabbitmqHandler= new RabbitMQHandler(sysvar_rabbitmq_host, 
 
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                                           sysvar_rabbitmq_port, 
 
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                                           sysvar_rabbitmq_username, 
 
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                                           sysvar_rabbitmq_password, 
 
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                                           sysvar_rabbitmq_virtualhost);
 
148
    } 
 
149
    catch (exception& e) 
 
150
    {
 
151
      errmsg_printf(ERRMSG_LVL_ERROR, _("Failed to allocate the RabbitMQHandler.  Got error: %s\n"),
 
152
                    e.what());
 
153
      return 1;
 
154
    }
 
155
    try 
 
156
    {
 
157
      rabbitmqLogger= new RabbitMQLog("rabbit_log_applier", rabbitmqHandler);
 
158
    } 
 
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    catch (exception& e) 
 
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    {
 
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      errmsg_printf(ERRMSG_LVL_ERROR, _("Failed to allocate the RabbitMQLog instance.  Got error: %s\n"), 
 
162
                    e.what());
 
163
      return 1;
 
164
    }
 
165
 
 
166
    context.add(rabbitmqLogger);
 
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    ReplicationServices &replication_services= ReplicationServices::singleton();
 
168
    string replicator_name(sysvar_rabbitmq_use_replicator);
 
169
    replication_services.attachApplier(rabbitmqLogger, replicator_name);
 
170
    return 0;
 
171
  }
 
172
  return 0;
 
173
}
 
174
 
 
175
 
 
176
static DRIZZLE_SYSVAR_BOOL(enable,
 
177
                           sysvar_rabbitmq_log_enabled,
 
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                           PLUGIN_VAR_NOCMDARG,
 
179
                           N_("Enable rabbitmq log"),
 
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                           NULL, /* check func */
 
181
                           NULL, /* update func */
 
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                           false /* default */);
 
183
 
 
184
 
 
185
static DRIZZLE_SYSVAR_STR(hostname,
 
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                          sysvar_rabbitmq_host,
 
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                          PLUGIN_VAR_READONLY,
 
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                          N_("Host name to connect to"),
 
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                          NULL, /* check func */
 
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                          NULL, /* update func*/
 
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                          "localhost" /* default */);
 
192
 
 
193
 
 
194
static DRIZZLE_SYSVAR_INT(port,
 
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                          sysvar_rabbitmq_port,
 
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                          PLUGIN_VAR_READONLY,
 
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                          N_("RabbitMQ Port"),
 
198
                          NULL, /* check func */
 
199
                          NULL, /* update func */
 
200
                          5672, /* default */
 
201
                          0,
 
202
                          65535,
 
203
                          0);
 
204
 
 
205
static DRIZZLE_SYSVAR_STR(username,
 
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                          sysvar_rabbitmq_username,
 
207
                          PLUGIN_VAR_READONLY,
 
208
                          N_("RabbitMQ username"),
 
209
                          NULL, /* check func */
 
210
                          NULL, /* update func*/
 
211
                          "guest" /* default */);
 
212
 
 
213
static DRIZZLE_SYSVAR_STR(password,
 
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                          sysvar_rabbitmq_password,
 
215
                          PLUGIN_VAR_READONLY,
 
216
                          N_("RabbitMQ password"),
 
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                          NULL, /* check func */
 
218
                          NULL, /* update func*/
 
219
                          "guest" /* default */);
 
220
 
 
221
static DRIZZLE_SYSVAR_STR(virtualhost,
 
222
                          sysvar_rabbitmq_virtualhost,
 
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                          PLUGIN_VAR_READONLY,
 
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                          N_("RabbitMQ virtualhost"),
 
225
                          NULL, /* check func */
 
226
                          NULL, /* update func*/
 
227
                          "/" /* default */);
 
228
 
 
229
static DRIZZLE_SYSVAR_STR(exchange,
 
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                          sysvar_rabbitmq_exchange,
 
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                          PLUGIN_VAR_READONLY,
 
232
                          N_("Name of RabbitMQ exchange to publish to"),
 
233
                          NULL, /* check func */
 
234
                          NULL, /* update func*/
 
235
                          "ReplicationExchange" /* default */);
 
236
 
 
237
static DRIZZLE_SYSVAR_STR(routingkey,
 
238
                          sysvar_rabbitmq_routingkey,
 
239
                          PLUGIN_VAR_READONLY,
 
240
                          N_("Name of RabbitMQ routing key to use"),
 
241
                          NULL, /* check func */
 
242
                          NULL, /* update func*/
 
243
                          "ReplicationRoutingKey" /* default */);
 
244
 
 
245
static DRIZZLE_SYSVAR_STR(use_replicator,
 
246
                          sysvar_rabbitmq_use_replicator,
 
247
                          PLUGIN_VAR_READONLY,
 
248
                          N_("Name of the replicator plugin to use (default='default_replicator')"),
 
249
                          NULL, /* check func */
 
250
                          NULL, /* update func*/
 
251
                          DEFAULT_USE_REPLICATOR /* default */);
 
252
 
 
253
static drizzle_sys_var* system_variables[]= {
 
254
  DRIZZLE_SYSVAR(enable),
 
255
  DRIZZLE_SYSVAR(hostname),
 
256
  DRIZZLE_SYSVAR(port),
 
257
  DRIZZLE_SYSVAR(username),
 
258
  DRIZZLE_SYSVAR(password),
 
259
  DRIZZLE_SYSVAR(virtualhost),
 
260
  DRIZZLE_SYSVAR(exchange),
 
261
  DRIZZLE_SYSVAR(routingkey),
 
262
  DRIZZLE_SYSVAR(use_replicator),
 
263
  NULL
 
264
};
 
265
 
 
266
DRIZZLE_PLUGIN(init, system_variables);
 
267