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  • Committer: Joseph Daly
  • Date: 2010-10-24 03:19:07 UTC
  • mto: (1856.2.16 transaction_id_innodb)
  • mto: This revision was merged to the branch mainline in revision 1900.
  • Revision ID: skinny.moey@gmail.com-20101024031907-cnkdjmjycx62jsv0
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plugin/transaction_log/module.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) 2008-2009 Sun Microsystems, Inc.
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 *  Copyright (C) 2010 Jay Pipes <jaypipes@gmail.com>
 
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 *  Copyright (C) 2008-2009 Sun Microsystems
 
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 *  Copyright (c) 2010 Jay Pipes <jaypipes@gmail.com>
6
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 *
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 *  Authors:
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 *
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 * registration.
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 */
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33
 
#include <config.h>
 
33
#include "config.h"
34
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35
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#include "transaction_log.h"
36
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#include "transaction_log_applier.h"
38
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#include "data_dictionary_schema.h"
39
39
#include "print_transaction_message.h"
40
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#include "hexdump_transaction_message.h"
 
41
#include "background_worker.h"
41
42
 
42
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#include <errno.h>
43
44
 
44
45
#include <drizzled/plugin/plugin.h>
45
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#include <drizzled/session.h>
 
47
#include <drizzled/set_var.h>
46
48
#include <drizzled/gettext.h>
47
49
#include <boost/program_options.hpp>
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#include <drizzled/module/option_map.h>
62
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static bool sysvar_transaction_log_enabled= false;
63
65
 
64
66
/** Transaction Log plugin system variable - The path to the log file used */
65
 
static string sysvar_transaction_log_file;
 
67
static char* sysvar_transaction_log_file= (char *)DEFAULT_LOG_FILE_PATH;
66
68
 
67
69
/** 
68
70
 * Transaction Log plugin system variable - A debugging variable to assist 
82
84
 * TransactionLog::FLUSH_FREQUENCY_EVERY_WRITE == 1   ... sync on every write
83
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 * TransactionLog::FLUSH_FREQUENCY_EVERY_SECOND == 2  ... sync at most once a second
84
86
 */
85
 
typedef constrained_check<uint32_t, 2, 0> flush_constraint;
86
 
static flush_constraint sysvar_transaction_log_flush_frequency;
 
87
static uint32_t sysvar_transaction_log_flush_frequency= 0;
87
88
/**
88
89
 * Transaction Log plugin system variable - Number of slots to create
89
90
 * for managing write buffers
90
91
 */
91
 
typedef constrained_check<uint32_t, 8192, 4> write_buffers_constraint;
92
 
static write_buffers_constraint sysvar_transaction_log_num_write_buffers;
 
92
static uint32_t sysvar_transaction_log_num_write_buffers= 8;
93
93
/**
94
94
 * Transaction Log plugin system variable - The name of the replicator plugin
95
95
 * to pair the transaction log's applier with.  Defaults to "default"
96
96
 */
97
97
static const char DEFAULT_USE_REPLICATOR[]= "default";
98
 
static string sysvar_transaction_log_use_replicator;
 
98
static char *sysvar_transaction_log_use_replicator= (char *)DEFAULT_USE_REPLICATOR;
99
99
 
100
100
/** DATA_DICTIONARY views */
101
101
static TransactionLogTool *transaction_log_tool;
120
120
  {
121
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    (void) close(log_file);
122
122
  }
123
 
}
124
123
 
125
 
static void set_truncate_debug(Session *, sql_var_t)
126
 
{
127
 
  if (transaction_log)
128
 
  {
129
 
    if (sysvar_transaction_log_truncate_debug)
130
 
    {
131
 
      transaction_log->truncate();
132
 
      transaction_log_index->clear();
133
 
      sysvar_transaction_log_truncate_debug= false;
134
 
    }
135
 
  }
 
124
  /* These get strdup'd below */
 
125
  free(sysvar_transaction_log_file);
 
126
  free(sysvar_transaction_log_use_replicator);
136
127
}
137
128
 
138
129
static int init(drizzled::module::Context &context)
139
130
{
140
 
  context.registerVariable(new sys_var_bool_ptr_readonly("enable",
141
 
                                                         &sysvar_transaction_log_enabled));
142
 
  context.registerVariable(new sys_var_bool_ptr("truncate-debug",
143
 
                                                &sysvar_transaction_log_truncate_debug,
144
 
                                                set_truncate_debug));
145
 
 
146
 
  context.registerVariable(new sys_var_const_string("file",
147
 
                                                    sysvar_transaction_log_file));
148
 
  context.registerVariable(new sys_var_const_string("use-replicator",
149
 
                                                    sysvar_transaction_log_use_replicator));
150
 
  context.registerVariable(new sys_var_bool_ptr_readonly("enable-checksum",
151
 
                                                         &sysvar_transaction_log_checksum_enabled));
152
 
  context.registerVariable(new sys_var_constrained_value_readonly<uint32_t>("flush-frequency", sysvar_transaction_log_flush_frequency));
153
 
 
154
 
  context.registerVariable(new sys_var_constrained_value_readonly<uint32_t>("num-write-buffers",
155
 
                                                                            sysvar_transaction_log_num_write_buffers));
 
131
  const module::option_map &vm= context.getOptions();
 
132
 
 
133
  if (vm.count("flush-frequency"))
 
134
  {
 
135
    if (sysvar_transaction_log_flush_frequency > 2)
 
136
    {
 
137
      errmsg_printf(ERRMSG_LVL_ERROR, _("Invalid value for sync-method\n"));
 
138
      exit(-1);
 
139
    }
 
140
  }
 
141
 
 
142
  if (vm.count("num-write-buffers"))
 
143
  {
 
144
    if (sysvar_transaction_log_num_write_buffers < 4 || sysvar_transaction_log_num_write_buffers > 8192)
 
145
    {
 
146
      errmsg_printf(ERRMSG_LVL_ERROR, _("Invalid value for num-write-buffers\n"));
 
147
      exit(-1);
 
148
    }
 
149
  }
156
150
 
157
151
 
158
152
  /* Create and initialize the transaction log itself */
159
153
  if (sysvar_transaction_log_enabled)
160
154
  {
 
155
    if (vm.count("file"))
 
156
    {
 
157
      sysvar_transaction_log_file= strdup(vm["file"].as<string>().c_str());
 
158
    }
 
159
    else
 
160
    {
 
161
      sysvar_transaction_log_file= strdup(DEFAULT_LOG_FILE_PATH);
 
162
    }
161
163
  
162
 
    transaction_log= new (nothrow) TransactionLog(sysvar_transaction_log_file,
163
 
                                                  static_cast<int>(sysvar_transaction_log_flush_frequency),
 
164
    if (vm.count("use-replicator"))
 
165
    {
 
166
      sysvar_transaction_log_use_replicator= strdup(vm["use-replicator"].as<string>().c_str());
 
167
    }
 
168
    else
 
169
    {
 
170
      sysvar_transaction_log_use_replicator= strdup(DEFAULT_USE_REPLICATOR);
 
171
    }
 
172
    transaction_log= new (nothrow) TransactionLog(string(sysvar_transaction_log_file),
 
173
                                                  sysvar_transaction_log_flush_frequency,
164
174
                                                  sysvar_transaction_log_checksum_enabled);
165
175
 
166
176
    if (transaction_log == NULL)
167
177
    {
168
 
      sql_perror(_("Failed to allocate the TransactionLog instance"), sysvar_transaction_log_file);
 
178
      char errmsg[STRERROR_MAX];
 
179
      strerror_r(errno, errmsg, sizeof(errmsg));
 
180
      errmsg_printf(ERRMSG_LVL_ERROR, _("Failed to allocate the TransactionLog instance.  Got error: %s\n"), 
 
181
                    errmsg);
169
182
      return 1;
170
183
    }
171
184
    else
173
186
      /* Check to see if the log was not created properly */
174
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      if (transaction_log->hasError())
175
188
      {
176
 
        errmsg_printf(error::ERROR, _("Failed to initialize the Transaction Log.  Got error: %s\n"), 
 
189
        errmsg_printf(ERRMSG_LVL_ERROR, _("Failed to initialize the Transaction Log.  Got error: %s\n"), 
177
190
                      transaction_log->getErrorMessage().c_str());
178
191
        return 1;
179
192
      }
183
196
    transaction_log_index= new (nothrow) TransactionLogIndex(*transaction_log);
184
197
    if (transaction_log_index == NULL)
185
198
    {
186
 
      sql_perror(_("Failed to allocate the TransactionLogIndex instance"), sysvar_transaction_log_file);
 
199
      char errmsg[STRERROR_MAX];
 
200
      strerror_r(errno, errmsg, sizeof(errmsg));
 
201
      errmsg_printf(ERRMSG_LVL_ERROR, _("Failed to allocate the TransactionLogIndex instance.  Got error: %s\n"), 
 
202
                    errmsg);
187
203
      return 1;
188
204
    }
189
205
    else
191
207
      /* Check to see if the index was not created properly */
192
208
      if (transaction_log_index->hasError())
193
209
      {
194
 
        errmsg_printf(error::ERROR, _("Failed to initialize the Transaction Log Index.  Got error: %s\n"), 
 
210
        errmsg_printf(ERRMSG_LVL_ERROR, _("Failed to initialize the Transaction Log Index.  Got error: %s\n"), 
195
211
                      transaction_log_index->getErrorMessage().c_str());
196
212
        return 1;
197
213
      }
201
217
    transaction_log_applier= new (nothrow) TransactionLogApplier("transaction_log_applier",
202
218
                                                                 transaction_log, 
203
219
                                                                 transaction_log_index, 
204
 
                                                                 static_cast<uint32_t>(sysvar_transaction_log_num_write_buffers));
 
220
                                                                 sysvar_transaction_log_num_write_buffers);
205
221
    if (transaction_log_applier == NULL)
206
222
    {
207
 
      sql_perror(_("Failed to allocate the TransactionLogApplier instance"), sysvar_transaction_log_file);
 
223
      char errmsg[STRERROR_MAX];
 
224
      strerror_r(errno, errmsg, sizeof(errmsg));
 
225
      errmsg_printf(ERRMSG_LVL_ERROR, _("Failed to allocate the TransactionLogApplier instance.  Got error: %s\n"), 
 
226
                    errmsg);
208
227
      return 1;
209
228
    }
210
229
    context.add(transaction_log_applier);
211
230
    ReplicationServices &replication_services= ReplicationServices::singleton();
212
 
    replication_services.attachApplier(transaction_log_applier,
213
 
                                       sysvar_transaction_log_use_replicator);
 
231
    string replicator_name(sysvar_transaction_log_use_replicator);
 
232
    replication_services.attachApplier(transaction_log_applier, replicator_name);
214
233
 
215
234
    /* Setup DATA_DICTIONARY views */
216
235
 
229
248
    hexdump_transaction_message_func_factory=
230
249
      new plugin::Create_function<HexdumpTransactionMessageFunction>("hexdump_transaction_message");
231
250
    context.add(hexdump_transaction_message_func_factory);
 
251
 
 
252
    /* 
 
253
     * Setup the background worker thread which maintains
 
254
     * summary information about the transaction log.
 
255
     */
 
256
    if (initTransactionLogBackgroundWorker())
 
257
      return 1; /* Error message output handled in function above */
232
258
  }
233
259
  return 0;
234
260
}
235
261
 
236
262
 
 
263
static void set_truncate_debug(Session *,
 
264
                               drizzle_sys_var *, 
 
265
                               void *, 
 
266
                               const void *save)
 
267
{
 
268
  /* 
 
269
   * The const void * save comes directly from the check function, 
 
270
   * which should simply return the result from the set statement. 
 
271
   */
 
272
  if (transaction_log)
 
273
  {
 
274
    if (*(bool *)save != false)
 
275
    {
 
276
      transaction_log->truncate();
 
277
      transaction_log_index->clear();
 
278
    }
 
279
  }
 
280
}
 
281
 
 
282
static DRIZZLE_SYSVAR_BOOL(enable,
 
283
                           sysvar_transaction_log_enabled,
 
284
                           PLUGIN_VAR_NOCMDARG | PLUGIN_VAR_READONLY,
 
285
                           N_("Enable transaction log"),
 
286
                           NULL, /* check func */
 
287
                           NULL, /* update func */
 
288
                           false /* default */);
 
289
 
 
290
static DRIZZLE_SYSVAR_BOOL(truncate_debug,
 
291
                           sysvar_transaction_log_truncate_debug,
 
292
                           PLUGIN_VAR_NOCMDARG,
 
293
                           N_("DEBUGGING - Truncate transaction log"),
 
294
                           NULL, /* check func */
 
295
                           set_truncate_debug, /* update func */
 
296
                           false /* default */);
 
297
 
 
298
static DRIZZLE_SYSVAR_STR(file,
 
299
                          sysvar_transaction_log_file,
 
300
                          PLUGIN_VAR_READONLY,
 
301
                          N_("Path to the file to use for transaction log"),
 
302
                          NULL, /* check func */
 
303
                          NULL, /* update func*/
 
304
                          DEFAULT_LOG_FILE_PATH /* default */);
 
305
 
 
306
static DRIZZLE_SYSVAR_STR(use_replicator,
 
307
                          sysvar_transaction_log_use_replicator,
 
308
                          PLUGIN_VAR_READONLY,
 
309
                          N_("Name of the replicator plugin to use (default='default_replicator')"),
 
310
                          NULL, /* check func */
 
311
                          NULL, /* update func*/
 
312
                          DEFAULT_USE_REPLICATOR /* default */);
 
313
 
 
314
static DRIZZLE_SYSVAR_BOOL(enable_checksum,
 
315
                           sysvar_transaction_log_checksum_enabled,
 
316
                           PLUGIN_VAR_NOCMDARG,
 
317
                           N_("Enable CRC32 Checksumming of each written transaction log entry"),
 
318
                           NULL, /* check func */
 
319
                           NULL, /* update func */
 
320
                           false /* default */);
 
321
 
 
322
static DRIZZLE_SYSVAR_UINT(flush_frequency,
 
323
                           sysvar_transaction_log_flush_frequency,
 
324
                           PLUGIN_VAR_OPCMDARG,
 
325
                           N_("0 == rely on operating system to sync log file (default), "
 
326
                              "1 == sync file at each transaction write, "
 
327
                              "2 == sync log file once per second"),
 
328
                           NULL, /* check func */
 
329
                           NULL, /* update func */
 
330
                           0, /* default */
 
331
                           0,
 
332
                           2,
 
333
                           0);
 
334
 
 
335
static DRIZZLE_SYSVAR_UINT(num_write_buffers,
 
336
                           sysvar_transaction_log_num_write_buffers,
 
337
                           PLUGIN_VAR_OPCMDARG,
 
338
                           N_("Number of slots for in-memory write buffers (default=8)."),
 
339
                           NULL, /* check func */
 
340
                           NULL, /* update func */
 
341
                           8, /* default */
 
342
                           4,
 
343
                           8192,
 
344
                           0);
 
345
 
237
346
static void init_options(drizzled::module::option_context &context)
238
347
{
239
348
  context("truncate-debug",
240
349
          po::value<bool>(&sysvar_transaction_log_truncate_debug)->default_value(false)->zero_tokens(),
241
 
          _("DEBUGGING - Truncate transaction log"));
 
350
          N_("DEBUGGING - Truncate transaction log"));
242
351
  context("enable-checksum",
243
352
          po::value<bool>(&sysvar_transaction_log_checksum_enabled)->default_value(false)->zero_tokens(),
244
 
          _("Enable CRC32 Checksumming of each written transaction log entry"));  
 
353
          N_("Enable CRC32 Checksumming of each written transaction log entry"));  
245
354
  context("enable",
246
355
          po::value<bool>(&sysvar_transaction_log_enabled)->default_value(false)->zero_tokens(),
247
 
          _("Enable transaction log"));
 
356
          N_("Enable transaction log"));
248
357
  context("file",
249
 
          po::value<string>(&sysvar_transaction_log_file)->default_value(DEFAULT_LOG_FILE_PATH),
250
 
          _("Path to the file to use for transaction log"));
 
358
          po::value<string>(),
 
359
          N_("Path to the file to use for transaction log"));
251
360
  context("use-replicator",
252
 
          po::value<string>(&sysvar_transaction_log_use_replicator)->default_value(DEFAULT_USE_REPLICATOR),
253
 
          _("Name of the replicator plugin to use (default='default_replicator')")); 
 
361
          po::value<string>(),
 
362
          N_("Name of the replicator plugin to use (default='default_replicator')")); 
254
363
  context("flush-frequency",
255
 
          po::value<flush_constraint>(&sysvar_transaction_log_flush_frequency)->default_value(0),
256
 
          _("0 == rely on operating system to sync log file (default), 1 == sync file at each transaction write, 2 == sync log file once per second"));
 
364
          po::value<uint32_t>(&sysvar_transaction_log_flush_frequency)->default_value(0),
 
365
          N_("0 == rely on operating system to sync log file (default), 1 == sync file at each transaction write, 2 == sync log file once per second"));
257
366
  context("num-write-buffers",
258
 
          po::value<write_buffers_constraint>(&sysvar_transaction_log_num_write_buffers)->default_value(8),
259
 
          _("Number of slots for in-memory write buffers (default=8)."));
 
367
          po::value<uint32_t>(&sysvar_transaction_log_num_write_buffers)->default_value(8),
 
368
          N_("Number of slots for in-memory write buffers (default=8)."));
260
369
}
261
370
 
262
 
DRIZZLE_PLUGIN(init, NULL, init_options);
 
371
static drizzle_sys_var* sys_variables[]= {
 
372
  DRIZZLE_SYSVAR(enable),
 
373
  DRIZZLE_SYSVAR(truncate_debug),
 
374
  DRIZZLE_SYSVAR(file),
 
375
  DRIZZLE_SYSVAR(enable_checksum),
 
376
  DRIZZLE_SYSVAR(flush_frequency),
 
377
  DRIZZLE_SYSVAR(num_write_buffers),
 
378
  DRIZZLE_SYSVAR(use_replicator),
 
379
  NULL
 
380
};
 
381
 
 
382
DRIZZLE_PLUGIN(init, sys_variables, init_options);