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Viewing changes to plugin/transaction_log/module.cc

  • Committer: Brian Aker
  • Date: 2010-10-29 01:13:40 UTC
  • mto: (1890.1.1 build)
  • mto: This revision was merged to the branch mainline in revision 1891.
  • Revision ID: brian@tangent.org-20101029011340-y9ixm180v9daypqr
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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>
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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
36
#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
 
62
63
static bool sysvar_transaction_log_enabled= false;
63
64
 
64
65
/** Transaction Log plugin system variable - The path to the log file used */
65
 
static string sysvar_transaction_log_file;
 
66
static char* sysvar_transaction_log_file= (char *)DEFAULT_LOG_FILE_PATH;
66
67
 
67
68
/** 
68
69
 * Transaction Log plugin system variable - A debugging variable to assist 
82
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 * 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
85
 */
85
 
typedef constrained_check<uint32_t, 2, 0> flush_constraint;
86
 
static flush_constraint sysvar_transaction_log_flush_frequency;
 
86
static uint32_t sysvar_transaction_log_flush_frequency= 0;
87
87
/**
88
88
 * Transaction Log plugin system variable - Number of slots to create
89
89
 * for managing write buffers
90
90
 */
91
 
typedef constrained_check<uint32_t, 8192, 4> write_buffers_constraint;
92
 
static write_buffers_constraint sysvar_transaction_log_num_write_buffers;
 
91
static uint32_t sysvar_transaction_log_num_write_buffers= 8;
93
92
/**
94
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 * Transaction Log plugin system variable - The name of the replicator plugin
95
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 * to pair the transaction log's applier with.  Defaults to "default"
96
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 */
97
96
static const char DEFAULT_USE_REPLICATOR[]= "default";
98
 
static string sysvar_transaction_log_use_replicator;
 
97
static char *sysvar_transaction_log_use_replicator= (char *)DEFAULT_USE_REPLICATOR;
99
98
 
100
99
/** DATA_DICTIONARY views */
101
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static TransactionLogTool *transaction_log_tool;
120
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  {
121
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    (void) close(log_file);
122
121
  }
123
 
}
124
122
 
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
 
  }
 
123
  /* These get strdup'd below */
 
124
  free(sysvar_transaction_log_file);
 
125
  free(sysvar_transaction_log_use_replicator);
136
126
}
137
127
 
138
128
static int init(drizzled::module::Context &context)
139
129
{
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));
 
130
  const module::option_map &vm= context.getOptions();
 
131
 
 
132
  if (vm.count("flush-frequency"))
 
133
  {
 
134
    if (sysvar_transaction_log_flush_frequency > 2)
 
135
    {
 
136
      errmsg_printf(ERRMSG_LVL_ERROR, _("Invalid value for sync-method\n"));
 
137
      exit(-1);
 
138
    }
 
139
  }
 
140
 
 
141
  if (vm.count("num-write-buffers"))
 
142
  {
 
143
    if (sysvar_transaction_log_num_write_buffers < 4 || sysvar_transaction_log_num_write_buffers > 8192)
 
144
    {
 
145
      errmsg_printf(ERRMSG_LVL_ERROR, _("Invalid value for num-write-buffers\n"));
 
146
      exit(-1);
 
147
    }
 
148
  }
156
149
 
157
150
 
158
151
  /* Create and initialize the transaction log itself */
159
152
  if (sysvar_transaction_log_enabled)
160
153
  {
 
154
    if (vm.count("file"))
 
155
    {
 
156
      sysvar_transaction_log_file= strdup(vm["file"].as<string>().c_str());
 
157
    }
 
158
    else
 
159
    {
 
160
      sysvar_transaction_log_file= strdup(DEFAULT_LOG_FILE_PATH);
 
161
    }
161
162
  
162
 
    transaction_log= new (nothrow) TransactionLog(sysvar_transaction_log_file,
163
 
                                                  static_cast<int>(sysvar_transaction_log_flush_frequency),
 
163
    if (vm.count("use-replicator"))
 
164
    {
 
165
      sysvar_transaction_log_use_replicator= strdup(vm["use-replicator"].as<string>().c_str());
 
166
    }
 
167
    else
 
168
    {
 
169
      sysvar_transaction_log_use_replicator= strdup(DEFAULT_USE_REPLICATOR);
 
170
    }
 
171
    transaction_log= new (nothrow) TransactionLog(string(sysvar_transaction_log_file),
 
172
                                                  sysvar_transaction_log_flush_frequency,
164
173
                                                  sysvar_transaction_log_checksum_enabled);
165
174
 
166
175
    if (transaction_log == NULL)
167
176
    {
168
 
      sql_perror(_("Failed to allocate the TransactionLog instance"), sysvar_transaction_log_file);
 
177
      char errmsg[STRERROR_MAX];
 
178
      strerror_r(errno, errmsg, sizeof(errmsg));
 
179
      errmsg_printf(ERRMSG_LVL_ERROR, _("Failed to allocate the TransactionLog instance.  Got error: %s\n"), 
 
180
                    errmsg);
169
181
      return 1;
170
182
    }
171
183
    else
173
185
      /* Check to see if the log was not created properly */
174
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      if (transaction_log->hasError())
175
187
      {
176
 
        errmsg_printf(error::ERROR, _("Failed to initialize the Transaction Log.  Got error: %s\n"), 
 
188
        errmsg_printf(ERRMSG_LVL_ERROR, _("Failed to initialize the Transaction Log.  Got error: %s\n"), 
177
189
                      transaction_log->getErrorMessage().c_str());
178
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        return 1;
179
191
      }
183
195
    transaction_log_index= new (nothrow) TransactionLogIndex(*transaction_log);
184
196
    if (transaction_log_index == NULL)
185
197
    {
186
 
      sql_perror(_("Failed to allocate the TransactionLogIndex instance"), sysvar_transaction_log_file);
 
198
      char errmsg[STRERROR_MAX];
 
199
      strerror_r(errno, errmsg, sizeof(errmsg));
 
200
      errmsg_printf(ERRMSG_LVL_ERROR, _("Failed to allocate the TransactionLogIndex instance.  Got error: %s\n"), 
 
201
                    errmsg);
187
202
      return 1;
188
203
    }
189
204
    else
191
206
      /* Check to see if the index was not created properly */
192
207
      if (transaction_log_index->hasError())
193
208
      {
194
 
        errmsg_printf(error::ERROR, _("Failed to initialize the Transaction Log Index.  Got error: %s\n"), 
 
209
        errmsg_printf(ERRMSG_LVL_ERROR, _("Failed to initialize the Transaction Log Index.  Got error: %s\n"), 
195
210
                      transaction_log_index->getErrorMessage().c_str());
196
211
        return 1;
197
212
      }
201
216
    transaction_log_applier= new (nothrow) TransactionLogApplier("transaction_log_applier",
202
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                                                                 transaction_log, 
203
218
                                                                 transaction_log_index, 
204
 
                                                                 static_cast<uint32_t>(sysvar_transaction_log_num_write_buffers));
 
219
                                                                 sysvar_transaction_log_num_write_buffers);
205
220
    if (transaction_log_applier == NULL)
206
221
    {
207
 
      sql_perror(_("Failed to allocate the TransactionLogApplier instance"), sysvar_transaction_log_file);
 
222
      char errmsg[STRERROR_MAX];
 
223
      strerror_r(errno, errmsg, sizeof(errmsg));
 
224
      errmsg_printf(ERRMSG_LVL_ERROR, _("Failed to allocate the TransactionLogApplier instance.  Got error: %s\n"), 
 
225
                    errmsg);
208
226
      return 1;
209
227
    }
210
228
    context.add(transaction_log_applier);
211
229
    ReplicationServices &replication_services= ReplicationServices::singleton();
212
 
    replication_services.attachApplier(transaction_log_applier,
213
 
                                       sysvar_transaction_log_use_replicator);
 
230
    string replicator_name(sysvar_transaction_log_use_replicator);
 
231
    replication_services.attachApplier(transaction_log_applier, replicator_name);
214
232
 
215
233
    /* Setup DATA_DICTIONARY views */
216
234
 
229
247
    hexdump_transaction_message_func_factory=
230
248
      new plugin::Create_function<HexdumpTransactionMessageFunction>("hexdump_transaction_message");
231
249
    context.add(hexdump_transaction_message_func_factory);
 
250
 
 
251
    /* 
 
252
     * Setup the background worker thread which maintains
 
253
     * summary information about the transaction log.
 
254
     */
 
255
    if (initTransactionLogBackgroundWorker())
 
256
      return 1; /* Error message output handled in function above */
232
257
  }
233
258
  return 0;
234
259
}
235
260
 
236
261
 
 
262
static void set_truncate_debug(Session *,
 
263
                               drizzle_sys_var *, 
 
264
                               void *, 
 
265
                               const void *save)
 
266
{
 
267
  /* 
 
268
   * The const void * save comes directly from the check function, 
 
269
   * which should simply return the result from the set statement. 
 
270
   */
 
271
  if (transaction_log)
 
272
  {
 
273
    if (*(bool *)save != false)
 
274
    {
 
275
      transaction_log->truncate();
 
276
      transaction_log_index->clear();
 
277
    }
 
278
  }
 
279
}
 
280
 
 
281
static DRIZZLE_SYSVAR_BOOL(enable,
 
282
                           sysvar_transaction_log_enabled,
 
283
                           PLUGIN_VAR_NOCMDARG | PLUGIN_VAR_READONLY,
 
284
                           N_("Enable transaction log"),
 
285
                           NULL, /* check func */
 
286
                           NULL, /* update func */
 
287
                           false /* default */);
 
288
 
 
289
static DRIZZLE_SYSVAR_BOOL(truncate_debug,
 
290
                           sysvar_transaction_log_truncate_debug,
 
291
                           PLUGIN_VAR_NOCMDARG,
 
292
                           N_("DEBUGGING - Truncate transaction log"),
 
293
                           NULL, /* check func */
 
294
                           set_truncate_debug, /* update func */
 
295
                           false /* default */);
 
296
 
 
297
static DRIZZLE_SYSVAR_STR(file,
 
298
                          sysvar_transaction_log_file,
 
299
                          PLUGIN_VAR_READONLY,
 
300
                          N_("Path to the file to use for transaction log"),
 
301
                          NULL, /* check func */
 
302
                          NULL, /* update func*/
 
303
                          DEFAULT_LOG_FILE_PATH /* default */);
 
304
 
 
305
static DRIZZLE_SYSVAR_STR(use_replicator,
 
306
                          sysvar_transaction_log_use_replicator,
 
307
                          PLUGIN_VAR_READONLY,
 
308
                          N_("Name of the replicator plugin to use (default='default_replicator')"),
 
309
                          NULL, /* check func */
 
310
                          NULL, /* update func*/
 
311
                          DEFAULT_USE_REPLICATOR /* default */);
 
312
 
 
313
static DRIZZLE_SYSVAR_BOOL(enable_checksum,
 
314
                           sysvar_transaction_log_checksum_enabled,
 
315
                           PLUGIN_VAR_NOCMDARG,
 
316
                           N_("Enable CRC32 Checksumming of each written transaction log entry"),
 
317
                           NULL, /* check func */
 
318
                           NULL, /* update func */
 
319
                           false /* default */);
 
320
 
 
321
static DRIZZLE_SYSVAR_UINT(flush_frequency,
 
322
                           sysvar_transaction_log_flush_frequency,
 
323
                           PLUGIN_VAR_OPCMDARG,
 
324
                           N_("0 == rely on operating system to sync log file (default), "
 
325
                              "1 == sync file at each transaction write, "
 
326
                              "2 == sync log file once per second"),
 
327
                           NULL, /* check func */
 
328
                           NULL, /* update func */
 
329
                           0, /* default */
 
330
                           0,
 
331
                           2,
 
332
                           0);
 
333
 
 
334
static DRIZZLE_SYSVAR_UINT(num_write_buffers,
 
335
                           sysvar_transaction_log_num_write_buffers,
 
336
                           PLUGIN_VAR_OPCMDARG,
 
337
                           N_("Number of slots for in-memory write buffers (default=8)."),
 
338
                           NULL, /* check func */
 
339
                           NULL, /* update func */
 
340
                           8, /* default */
 
341
                           4,
 
342
                           8192,
 
343
                           0);
 
344
 
237
345
static void init_options(drizzled::module::option_context &context)
238
346
{
239
347
  context("truncate-debug",
240
348
          po::value<bool>(&sysvar_transaction_log_truncate_debug)->default_value(false)->zero_tokens(),
241
 
          _("DEBUGGING - Truncate transaction log"));
 
349
          N_("DEBUGGING - Truncate transaction log"));
242
350
  context("enable-checksum",
243
351
          po::value<bool>(&sysvar_transaction_log_checksum_enabled)->default_value(false)->zero_tokens(),
244
 
          _("Enable CRC32 Checksumming of each written transaction log entry"));  
 
352
          N_("Enable CRC32 Checksumming of each written transaction log entry"));  
245
353
  context("enable",
246
354
          po::value<bool>(&sysvar_transaction_log_enabled)->default_value(false)->zero_tokens(),
247
 
          _("Enable transaction log"));
 
355
          N_("Enable transaction log"));
248
356
  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"));
 
357
          po::value<string>(),
 
358
          N_("Path to the file to use for transaction log"));
251
359
  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')")); 
 
360
          po::value<string>(),
 
361
          N_("Name of the replicator plugin to use (default='default_replicator')")); 
254
362
  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"));
 
363
          po::value<uint32_t>(&sysvar_transaction_log_flush_frequency)->default_value(0),
 
364
          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
365
  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)."));
 
366
          po::value<uint32_t>(&sysvar_transaction_log_num_write_buffers)->default_value(8),
 
367
          N_("Number of slots for in-memory write buffers (default=8)."));
260
368
}
261
369
 
262
 
DRIZZLE_PLUGIN(init, NULL, init_options);
 
370
static drizzle_sys_var* sys_variables[]= {
 
371
  DRIZZLE_SYSVAR(enable),
 
372
  DRIZZLE_SYSVAR(truncate_debug),
 
373
  DRIZZLE_SYSVAR(file),
 
374
  DRIZZLE_SYSVAR(enable_checksum),
 
375
  DRIZZLE_SYSVAR(flush_frequency),
 
376
  DRIZZLE_SYSVAR(num_write_buffers),
 
377
  DRIZZLE_SYSVAR(use_replicator),
 
378
  NULL
 
379
};
 
380
 
 
381
DRIZZLE_PLUGIN(init, sys_variables, init_options);