sql_repl.cc 39.1 KB
Newer Older
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23
/* Copyright (C) 2000 MySQL AB & MySQL Finland AB & TCX DataKonsult AB

   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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA */

// Sasha Pachev <sasha@mysql.com> is currently in charge of this file
// Do not mess with it without his permission!

#include "mysql_priv.h"
#include "sql_repl.h"
#include "sql_acl.h"
#include "log_event.h"
24
#include "mini_client.h"
unknown's avatar
unknown committed
25
#include <thr_alarm.h>
unknown's avatar
unknown committed
26
#include <my_dir.h>
27

28
#define SLAVE_LIST_CHUNK 128
unknown's avatar
unknown committed
29
#define SLAVE_ERRMSG_SIZE (FN_REFLEN+64)
30

31 32
extern const char* any_db;
extern pthread_handler_decl(handle_slave,arg);
33

34 35
HASH slave_list;

36 37 38 39 40
#ifndef DBUG_OFF
int max_binlog_dump_events = 0; // unlimited
bool opt_sporadic_binlog_dump_fail = 0;
static int binlog_dump_count = 0;
#endif
unknown's avatar
unknown committed
41

unknown's avatar
unknown committed
42 43 44 45
static Slave_log_event* find_slave_event(IO_CACHE* log,
					 const char* log_file_name,
					 char* errmsg);

unknown's avatar
unknown committed
46 47 48
static uint32* slave_list_key(SLAVE_INFO* si, uint* len,
			     my_bool not_used __attribute__((unused)))
{
49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71
  *len = 4;
  return &si->server_id;
}

static void slave_info_free(void *s)
{
  my_free((byte*)s, MYF(MY_WME));
}

void init_slave_list()
{
  hash_init(&slave_list, SLAVE_LIST_CHUNK, 0, 0,
	    (hash_get_key) slave_list_key, slave_info_free, 0);
  pthread_mutex_init(&LOCK_slave_list, MY_MUTEX_INIT_FAST);
}

void end_slave_list()
{
  pthread_mutex_lock(&LOCK_slave_list);
  hash_free(&slave_list);
  pthread_mutex_unlock(&LOCK_slave_list);
  pthread_mutex_destroy(&LOCK_slave_list);
}
unknown's avatar
unknown committed
72 73 74 75

static int fake_rotate_event(NET* net, String* packet, char* log_file_name,
			     const char**errmsg)
{
76
  char header[LOG_EVENT_HEADER_LEN], buf[ROTATE_HEADER_LEN];
unknown's avatar
unknown committed
77 78 79 80 81 82 83 84 85 86
  memset(header, 0, 4); // when does not matter
  header[EVENT_TYPE_OFFSET] = ROTATE_EVENT;
  char* p = strrchr(log_file_name, FN_LIBCHAR);
  // find the last slash
  if(p)
    p++;
  else
    p = log_file_name;

  uint ident_len = (uint) strlen(p);
87
  ulong event_len = ident_len + ROTATE_EVENT_OVERHEAD;
88
  int4store(header + SERVER_ID_OFFSET, server_id);
unknown's avatar
unknown committed
89
  int4store(header + EVENT_LEN_OFFSET, event_len);
90 91
  int2store(header + FLAGS_OFFSET, 0);
  int4store(header + LOG_SEQ_OFFSET, 0);
unknown's avatar
unknown committed
92
  packet->append(header, sizeof(header));
93 94
  int8store(buf, 4); // tell slave to skip magic number
  packet->append(buf, ROTATE_HEADER_LEN);
unknown's avatar
unknown committed
95 96 97 98 99 100 101 102 103
  packet->append(p,ident_len);
  if(my_net_write(net, (char*)packet->ptr(), packet->length()))
    {
      *errmsg = "failed on my_net_write()";
      return -1;
    }
  return 0;
}

104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152
int register_slave(THD* thd, uchar* packet, uint packet_length)
{
  uint len;
  SLAVE_INFO* si, *old_si;
  int res = 1;
  uchar* p = packet, *p_end = packet + packet_length;

  if(check_access(thd, FILE_ACL, any_db))
    return 1;
  
  if(!(si = (SLAVE_INFO*)my_malloc(sizeof(SLAVE_INFO), MYF(MY_WME))))
    goto err;

  si->server_id = uint4korr(p);
  p += 4;
  len = (uint)*p++;
  if(p + len > p_end || len > sizeof(si->host) - 1)
    goto err;
  memcpy(si->host, p, len);
  si->host[len] = 0;
  p += len;
  len = *p++;
  if(p + len > p_end || len > sizeof(si->user) - 1)
    goto err;
  memcpy(si->user, p, len);
  si->user[len] = 0;
  p += len;
  len = *p++;
  if(p + len > p_end || len > sizeof(si->password) - 1)
    goto err;
  memcpy(si->password, p, len);
  si->password[len] = 0;
  p += len;
  si->port = uint2korr(p);
  pthread_mutex_lock(&LOCK_slave_list);

  if((old_si = (SLAVE_INFO*)hash_search(&slave_list,
					(byte*)&si->server_id, 4)))
     hash_delete(&slave_list, (byte*)old_si);
    
  res = hash_insert(&slave_list, (byte*)si);
  pthread_mutex_unlock(&LOCK_slave_list);
  return res;
err:
  if(si)
    my_free((byte*)si, MYF(MY_WME));
  return res;
}

153 154 155 156 157 158

static int send_file(THD *thd)
{
  NET* net = &thd->net;
  int fd = -1,bytes, error = 1;
  char fname[FN_REFLEN+1];
unknown's avatar
unknown committed
159
  char *buf;
160
  const char *errmsg = 0;
unknown's avatar
unknown committed
161 162
  int old_timeout;
  uint packet_len;
163 164 165 166 167 168 169
  DBUG_ENTER("send_file");

  // the client might be slow loading the data, give him wait_timeout to do
  // the job
  old_timeout = thd->net.timeout;
  thd->net.timeout = thd->inactive_timeout;

unknown's avatar
unknown committed
170 171 172 173 174 175 176
  // spare the stack
  if(!(buf = alloc_root(&thd->mem_root,IO_SIZE)))
    {
      errmsg = "Out of memory";
      goto err;
    }

177 178
  // we need net_flush here because the client will not know it needs to send
  // us the file name until it has processed the load event entry
unknown's avatar
unknown committed
179
  if (net_flush(net) || (packet_len = my_net_read(net)) == packet_error)
180 181 182 183 184
  {
    errmsg = "Failed reading file name";
    goto err;
  }

unknown's avatar
unknown committed
185
  *((char*)net->read_pos +  packet_len) = 0; // terminate with \0
186
   //for fn_format
187 188 189 190 191 192 193 194 195 196 197
  fn_format(fname, (char*)net->read_pos + 1, "", "", 4);
  // this is needed to make replicate-ignore-db
  if (!strcmp(fname,"/dev/null"))
    goto end;

  if ((fd = my_open(fname, O_RDONLY, MYF(MY_WME))) < 0)
  {
    errmsg = "Failed on my_open()";
    goto err;
  }

unknown's avatar
unknown committed
198
  while ((bytes = (int) my_read(fd, (byte*) buf, IO_SIZE,
199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228
				MYF(MY_WME))) > 0)
  {
    if (my_net_write(net, buf, bytes))
    {
      errmsg = "Failed on my_net_write()";
      goto err;
    }
  }

 end:
  if (my_net_write(net, "", 0) || net_flush(net) ||
      (my_net_read(net) == packet_error))
  {
    errmsg = "failed negotiating file transfer close";
    goto err;
  }
  error = 0;

 err:
  thd->net.timeout = old_timeout;
  if(fd >= 0)
    (void) my_close(fd, MYF(MY_WME));
  if (errmsg)
  {
    sql_print_error("failed in send_file() : %s", errmsg);
    DBUG_PRINT("error", (errmsg));
  }
  DBUG_RETURN(error);
}

229

230
File open_binlog(IO_CACHE *log, const char *log_file_name,
231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262
		     const char **errmsg)
{
  File file;
  char magic[4];
  if ((file = my_open(log_file_name, O_RDONLY | O_BINARY, MYF(MY_WME))) < 0 ||
      init_io_cache(log, file, IO_SIZE*2, READ_CACHE, 0, 0,
		    MYF(MY_WME)))
  {
    *errmsg = "Could not open log file";		// This will not be sent
    goto err;
  }
  
  if (my_b_read(log, (byte*) magic, sizeof(magic)))
  {
    *errmsg = "I/O error reading binlog magic number";
    goto err;
  }
  if (memcmp(magic, BINLOG_MAGIC, 4))
  {
    *errmsg = "Binlog has bad magic number, fire your magician";
    goto err;
  }
  return file;

err:
  if (file > 0)
    my_close(file,MYF(0));
  end_io_cache(log);
  return -1;
}


unknown's avatar
unknown committed
263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288
void adjust_linfo_offsets(my_off_t purge_offset)
{
  THD *tmp;
  
  pthread_mutex_lock(&LOCK_thread_count);
  I_List_iterator<THD> it(threads);
  
  while((tmp=it++))
    {
      LOG_INFO* linfo;
	if((linfo = tmp->current_linfo))
	{
	  pthread_mutex_lock(&linfo->lock);
	  // no big deal if we just started reading the log
	  // nothing to adjust
	  if(linfo->index_file_offset < purge_offset)
	    linfo->fatal = (linfo->index_file_offset != 0);
	  else
	    linfo->index_file_offset -= purge_offset;
	  pthread_mutex_unlock(&linfo->lock);
	}
   }

  pthread_mutex_unlock(&LOCK_thread_count);
}

unknown's avatar
merge  
unknown committed
289

unknown's avatar
unknown committed
290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314
bool log_in_use(const char* log_name)
{
  int log_name_len = strlen(log_name) + 1;
  THD *tmp;
  bool result = 0;
  
  pthread_mutex_lock(&LOCK_thread_count);
  I_List_iterator<THD> it(threads);
  
  while((tmp=it++))
    {
      LOG_INFO* linfo;
      if((linfo = tmp->current_linfo))
	{
	  pthread_mutex_lock(&linfo->lock);
	  result = !memcmp(log_name, linfo->log_file_name, log_name_len);
	  pthread_mutex_unlock(&linfo->lock);
	  if(result) break;
	}
   }

  pthread_mutex_unlock(&LOCK_thread_count);
  return result;
}

unknown's avatar
merge  
unknown committed
315

unknown's avatar
unknown committed
316 317 318 319 320
int purge_master_logs(THD* thd, const char* to_log)
{
  char search_file_name[FN_REFLEN];
  mysql_bin_log.make_log_name(search_file_name, to_log);
  int res = mysql_bin_log.purge_logs(thd, search_file_name);
unknown's avatar
unknown committed
321
  const char* errmsg = 0;
unknown's avatar
unknown committed
322 323 324 325 326 327 328 329 330 331 332 333
  switch(res)
    {
    case 0: break;
    case LOG_INFO_EOF: errmsg = "Target log not found in binlog index"; break;
    case LOG_INFO_IO: errmsg = "I/O error reading log index file"; break;
    case LOG_INFO_INVALID: errmsg = "Server configuration does not permit \
binlog purge"; break;
    case LOG_INFO_SEEK: errmsg = "Failed on fseek()"; break;
    case LOG_INFO_PURGE_NO_ROTATE: errmsg = "Cannot purge unrotatable log";
      break;
    case LOG_INFO_MEM: errmsg = "Out of memory"; break;
    case LOG_INFO_FATAL: errmsg = "Fatal error during purge"; break;
unknown's avatar
unknown committed
334
    case LOG_INFO_IN_USE: errmsg = "A purgeable log is in use, will not purge";
unknown's avatar
unknown committed
335 336 337 338 339 340
      break;
    default:
      errmsg = "Unknown error during purge"; break;
    }
  
  if(errmsg)
unknown's avatar
unknown committed
341 342 343 344
    {
     send_error(&thd->net, 0, errmsg);
     return 1;
    }
unknown's avatar
unknown committed
345 346
  else
    send_ok(&thd->net);
unknown's avatar
unknown committed
347 348
  
  return 0;
unknown's avatar
unknown committed
349 350
}

unknown's avatar
merge  
unknown committed
351

352 353 354 355 356
void mysql_binlog_send(THD* thd, char* log_ident, ulong pos, ushort flags)
{
  LOG_INFO linfo;
  char *log_file_name = linfo.log_file_name;
  char search_file_name[FN_REFLEN];
357 358
  IO_CACHE log;
  File file = -1;
359 360 361 362
  String* packet = &thd->packet;
  int error;
  const char *errmsg = "Unknown error";
  NET* net = &thd->net;
363 364 365
#ifndef DBUG_OFF
  int left_events = max_binlog_dump_events;
#endif  
366 367
  DBUG_ENTER("mysql_binlog_send");

unknown's avatar
unknown committed
368
#ifndef DBUG_OFF
369 370 371 372 373 374 375
  if (opt_sporadic_binlog_dump_fail && (binlog_dump_count++ % 2))
  {
    errmsg = "Master failed COM_BINLOG_DUMP to test if slave can recover";
    goto err;
  }
#endif  

376 377
  bzero((char*) &log,sizeof(log));

378
  if(!mysql_bin_log.is_open())
379 380 381 382
  {
    errmsg = "Binary log is not open";
    goto err;
  }
unknown's avatar
unknown committed
383 384 385 386 387 388
  if(!server_id_supplied)
    {
      errmsg = "Misconfigured master - server id was not set";
      goto err;
    }
  
389
  if (log_ident[0])
390 391 392
    mysql_bin_log.make_log_name(search_file_name, log_ident);
  else
    search_file_name[0] = 0;
unknown's avatar
unknown committed
393 394 395
  
  linfo.index_file_offset = 0;
  thd->current_linfo = &linfo;
396

397 398 399 400 401
  if (mysql_bin_log.find_first_log(&linfo, search_file_name))
  {
    errmsg = "Could not find first log";
    goto err;
  }
402

403
  if ((file=open_binlog(&log, log_file_name, &errmsg)) < 0)
404
    goto err;
405

406
  if (pos < 4)
407
  {
unknown's avatar
unknown committed
408 409
    errmsg = "Client requested master to start repliction from \
impossible position";
410 411 412 413
    goto err;
  }
 
  my_b_seek(&log, pos);				// Seek will done on next read
414 415 416 417 418
  packet->length(0);
  packet->append("\0", 1);
  // we need to start a packet with something other than 255
  // to distiquish it from error

unknown's avatar
unknown committed
419 420 421 422 423 424 425 426 427
  // tell the client log name with a fake rotate_event
  // if we are at the start of the log
  if(pos == 4) 
  {
    if (fake_rotate_event(net, packet, log_file_name, &errmsg))
      goto err;
    packet->length(0);
    packet->append("\0", 1);
  }
unknown's avatar
unknown committed
428

unknown's avatar
unknown committed
429
  while (!net->error && net->vio != 0 && !thd->killed)
430 431
  {
    pthread_mutex_t *log_lock = mysql_bin_log.get_log_lock();
432
      
433 434
    while (!(error = Log_event::read_log_event(&log, packet, log_lock)))
    {
435 436 437 438 439 440 441 442
#ifndef DBUG_OFF
      if(max_binlog_dump_events && !left_events--)
      {
	net_flush(net);
	errmsg = "Debugging binlog dump abort";
	goto err;
      }
#endif      
unknown's avatar
unknown committed
443
      if (my_net_write(net, (char*)packet->ptr(), packet->length()) )
444 445 446 447 448 449
      {
	errmsg = "Failed on my_net_write()";
	goto err;
      }
      DBUG_PRINT("info", ("log event code %d",
			  (*packet)[LOG_EVENT_OFFSET+1] ));
unknown's avatar
unknown committed
450
      if ((*packet)[LOG_EVENT_OFFSET+1] == LOAD_EVENT)
451 452
      {
	if(send_file(thd))
453
	{
454
	  errmsg = "failed in send_file()";
455 456
	  goto err;
	}
457 458 459 460
      }
      packet->length(0);
      packet->append("\0",1);
    }
unknown's avatar
unknown committed
461
    
unknown's avatar
unknown committed
462
    if (error != LOG_READ_EOF)
463 464 465 466 467 468
    {
      switch(error)
      {
      case LOG_READ_BOGUS: 
	errmsg = "bogus data in log event";
	break;
unknown's avatar
unknown committed
469 470 471 472
      case LOG_READ_TOO_LARGE: 
	errmsg = "log event entry exceeded max_allowed_packet -\
 increase max_allowed_packet on master";
	break;
473 474 475 476 477 478 479 480 481
      case LOG_READ_IO:
	errmsg = "I/O error reading log event";
	break;
      case LOG_READ_MEM:
	errmsg = "memory allocation failed reading log event";
	break;
      case LOG_READ_TRUNC:
	errmsg = "binlog truncated in the middle of event";
	break;
unknown's avatar
unknown committed
482 483 484
      default:
	errmsg = "unknown error reading log event on the master";
	break;
485 486 487
      }
      goto err;
    }
488

489 490 491 492 493 494 495 496 497 498
    if(!(flags & BINLOG_DUMP_NON_BLOCK) &&
       mysql_bin_log.is_active(log_file_name))
      // block until there is more data in the log
      // unless non-blocking mode requested
    {
      if(net_flush(net))
      {
	errmsg = "failed on net_flush()";
	goto err;
      }
499

500 501 502 503 504 505
      // we may have missed the update broadcast from the log
      // that has just happened, let's try to catch it if it did
      // if we did not miss anything, we just wait for other threads
      // to signal us
      {
	log.error=0;
506

507 508 509 510 511
	// tell the kill thread how to wake us up
	pthread_mutex_lock(&thd->mysys_var->mutex);
	thd->mysys_var->current_mutex = log_lock;
	thd->mysys_var->current_cond = &COND_binlog_update;
	const char* proc_info = thd->proc_info;
512
	thd->proc_info = "Slave connection: waiting for binlog update";
513
	pthread_mutex_unlock(&thd->mysys_var->mutex);
514

515 516
	bool read_packet = 0, fatal_error = 0;

517 518 519 520 521 522 523 524 525
#ifndef DBUG_OFF
	if(max_binlog_dump_events && !left_events--)
	{
	  net_flush(net);
	  errmsg = "Debugging binlog dump abort";
	  goto err;
	}
#endif      

526 527
	// no one will update the log while we are reading
	// now, but we'll be quick and just read one record
unknown's avatar
unknown committed
528 529
	pthread_mutex_lock(log_lock);
	switch (Log_event::read_log_event(&log, packet, (pthread_mutex_t*) 0))
530
	{
531 532 533 534 535 536
	case 0:
	  read_packet = 1;
	  // we read successfully, so we'll need to send it to the
	  // slave
	  break;
	case LOG_READ_EOF:
unknown's avatar
unknown committed
537
	  DBUG_PRINT("wait",("waiting for data on binary log"));
538 539 540 541 542 543
	  pthread_cond_wait(&COND_binlog_update, log_lock);
	  break;

	default:
	  fatal_error = 1;
	  break;
544
	}
unknown's avatar
unknown committed
545
	pthread_mutex_unlock(log_lock);
546

547 548 549 550 551
	pthread_mutex_lock(&thd->mysys_var->mutex);
	thd->mysys_var->current_mutex= 0;
	thd->mysys_var->current_cond= 0;
	thd->proc_info= proc_info;
	pthread_mutex_unlock(&thd->mysys_var->mutex);
552

553 554 555 556 557 558 559 560
	if(read_packet)
	{
	  thd->proc_info = "sending update to slave";
	  if(my_net_write(net, (char*)packet->ptr(), packet->length()) )
	  {
	    errmsg = "Failed on my_net_write()";
	    goto err;
	  }
unknown's avatar
unknown committed
561

562 563 564
	  if((*packet)[LOG_EVENT_OFFSET+1] == LOAD_EVENT)
	  {
	    if(send_file(thd))
unknown's avatar
unknown committed
565
	    {
566
	      errmsg = "failed in send_file()";
unknown's avatar
unknown committed
567 568
	      goto err;
	    }
569
	  }
570 571 572 573
	  packet->length(0);
	  packet->append("\0",1);
	  // no need to net_flush because we will get to flush later when
	  // we hit EOF pretty quick
574
	}
575 576 577 578 579

	if(fatal_error)
	{
	  errmsg = "error reading log entry";
	  goto err;
580
	}
581 582
	log.error=0;
      }
583
    }
584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605
    else
    {
      bool loop_breaker = 0;
      // need this to break out of the for loop from switch
      thd->proc_info = "switching to next log";
      switch(mysql_bin_log.find_next_log(&linfo))
      {
      case LOG_INFO_EOF:
	loop_breaker = (flags & BINLOG_DUMP_NON_BLOCK);
	break;
      case 0:
	break;
      default:
	errmsg = "could not find next log";
	goto err;
      }

      if(loop_breaker)
	break;

      end_io_cache(&log);
      (void) my_close(file, MYF(MY_WME));
unknown's avatar
unknown committed
606
      
607 608
      // fake Rotate_log event just in case it did not make it to the log
      // otherwise the slave make get confused about the offset
609
      if ((file=open_binlog(&log, log_file_name, &errmsg)) < 0 ||
unknown's avatar
unknown committed
610 611 612 613 614
	  fake_rotate_event(net, packet, log_file_name, &errmsg))
	goto err;

      packet->length(0);
      packet->append("\0",1);
615
    }
616
  }
617

618 619
  end_io_cache(&log);
  (void)my_close(file, MYF(MY_WME));
620
  
621
  send_eof(&thd->net);
622
  thd->proc_info = "waiting to finalize termination";
unknown's avatar
unknown committed
623 624 625
  pthread_mutex_lock(&LOCK_thread_count);
  thd->current_linfo = 0;
  pthread_mutex_unlock(&LOCK_thread_count);
626 627
  DBUG_VOID_RETURN;
 err:
628
  thd->proc_info = "waiting to finalize termination";
629
  end_io_cache(&log);
unknown's avatar
unknown committed
630 631 632 633 634 635 636 637
  pthread_mutex_lock(&LOCK_thread_count);
  // exclude  iteration through thread list
  // this is needed for purge_logs() - it will iterate through
  // thread list and update thd->current_linfo->index_file_offset
  // this mutex will make sure that it never tried to update our linfo
  // after we return from this stack frame
  thd->current_linfo = 0;
  pthread_mutex_unlock(&LOCK_thread_count);
638 639
  if (file >= 0)
    (void) my_close(file, MYF(MY_WME));
unknown's avatar
unknown committed
640
  send_error(&thd->net, my_errno, errmsg);
641 642 643 644 645 646 647
  DBUG_VOID_RETURN;
}

int start_slave(THD* thd , bool net_report)
{
  if(!thd) thd = current_thd;
  NET* net = &thd->net;
648
  int slave_errno = 0;
649 650 651 652
  if (check_access(thd, PROCESS_ACL, any_db))
    return 1;
  pthread_mutex_lock(&LOCK_slave);
  if(!slave_running)
653 654
    {
      if(init_master_info(&glob_mi))
655
	slave_errno = ER_MASTER_INFO;
656 657 658 659 660
      else if(server_id_supplied && *glob_mi.host)
	{
	  pthread_t hThread;
	  if(pthread_create(&hThread, &connection_attrib, handle_slave, 0))
	    {
661
	      slave_errno = ER_SLAVE_THREAD;
662
	    }
unknown's avatar
fixed  
unknown committed
663 664
	  while(!slave_running) // slave might already be running by now
	   pthread_cond_wait(&COND_slave_start, &LOCK_slave);
665 666
	}
      else
667
	slave_errno = ER_BAD_SLAVE;
668
    }
669
  else
670
    slave_errno = ER_SLAVE_MUST_STOP;
671 672

  pthread_mutex_unlock(&LOCK_slave);
673
  if(slave_errno)
674
    {
675
      if(net_report) send_error(net, slave_errno);
676 677 678 679 680 681 682 683 684 685 686 687
      return 1;
    }
  else if(net_report)
    send_ok(net);

  return 0;
}

int stop_slave(THD* thd, bool net_report )
{
  if(!thd) thd = current_thd;
  NET* net = &thd->net;
688 689
  int slave_errno = 0;
  
690 691 692 693 694 695 696 697
  if (check_access(thd, PROCESS_ACL, any_db))
    return 1;

  pthread_mutex_lock(&LOCK_slave);
  if (slave_running)
  {
    abort_slave = 1;
    thr_alarm_kill(slave_real_id);
698 699
#ifdef SIGNAL_WITH_VIO_CLOSE
    slave_thd->close_active_vio();
700
#endif    
701 702 703
    // do not abort the slave in the middle of a query, so we do not set
    // thd->killed for the slave thread
    thd->proc_info = "waiting for slave to die";
unknown's avatar
unknown committed
704 705
    while(slave_running) 
      pthread_cond_wait(&COND_slave_stopped, &LOCK_slave);
706 707
  }
  else
708
    slave_errno = ER_SLAVE_NOT_RUNNING;
709 710 711 712

  pthread_mutex_unlock(&LOCK_slave);
  thd->proc_info = 0;

713
  if(slave_errno)
714
    {
715
     if(net_report) send_error(net, slave_errno);
716 717 718 719 720 721 722 723 724 725 726 727
     return 1;
    }
  else if(net_report)
    send_ok(net);

  return 0;
}

void reset_slave()
{
  MY_STAT stat_area;
  char fname[FN_REFLEN];
unknown's avatar
unknown committed
728
  bool slave_was_running ;
729

unknown's avatar
unknown committed
730 731 732 733 734 735 736 737 738 739
  pthread_mutex_lock(&LOCK_slave);
  if((slave_was_running = slave_running))
    {
      pthread_mutex_unlock(&LOCK_slave);
      stop_slave(0,0);
    }
  else
    pthread_mutex_unlock(&LOCK_slave);
  
  end_master_info(&glob_mi);
740
  fn_format(fname, master_info_file, mysql_data_home, "", 4+32);
741 742 743 744 745 746 747 748 749 750
  if(my_stat(fname, &stat_area, MYF(0)))
    if(my_delete(fname, MYF(MY_WME)))
        return;
  if(slave_was_running)
    start_slave(0,0);
}

void kill_zombie_dump_threads(uint32 slave_server_id)
{
  pthread_mutex_lock(&LOCK_thread_count);
751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778
  I_List_iterator<THD> it(threads);
  THD *tmp;

  while((tmp=it++))
    {
      if(tmp->command == COM_BINLOG_DUMP &&
	 tmp->server_id == slave_server_id)
	{
	  // here we do not call kill_one_thread()
	  // it will be slow because it will iterate through the list
	  // again. Plus it double-locks LOCK_thread_count, which
	  // make safe_mutex complain and abort
	  // so we just to our own thread murder
	  
	  thr_alarm_kill(tmp->real_id);
	  tmp->killed = 1;
	  pthread_mutex_lock(&tmp->mysys_var->mutex);
          tmp->mysys_var->abort = 1;
	  if(tmp->mysys_var->current_mutex)
	    {
	      pthread_mutex_lock(tmp->mysys_var->current_mutex);
	      pthread_cond_broadcast(tmp->mysys_var->current_cond);
	      pthread_mutex_unlock(tmp->mysys_var->current_mutex);
	    }
	  pthread_mutex_unlock(&tmp->mysys_var->mutex);
	}
   }
  
779 780 781 782 783 784 785 786 787 788 789 790 791
  pthread_mutex_unlock(&LOCK_thread_count);
}

int change_master(THD* thd)
{
  bool slave_was_running;
  // kill slave thread
  pthread_mutex_lock(&LOCK_slave);
  if((slave_was_running = slave_running))
    {
      abort_slave = 1;
      thr_alarm_kill(slave_real_id);
      thd->proc_info = "waiting for slave to die";
unknown's avatar
fixed  
unknown committed
792 793
      while(slave_running)
       pthread_cond_wait(&COND_slave_stopped, &LOCK_slave); // wait until done
794 795 796 797 798
    }
  pthread_mutex_unlock(&LOCK_slave);
  thd->proc_info = "changing master";
  LEX_MASTER_INFO* lex_mi = &thd->lex.mi;

unknown's avatar
unknown committed
799 800 801 802 803
  if(init_master_info(&glob_mi))
    {
      send_error(&thd->net, 0, "Could not initialize master info");
      return 1;
    }
804 805 806 807 808 809
  
  pthread_mutex_lock(&glob_mi.lock);
  if((lex_mi->host || lex_mi->port) && !lex_mi->log_file_name && !lex_mi->pos)
    {
      // if we change host or port, we must reset the postion
      glob_mi.log_file_name[0] = 0;
unknown's avatar
unknown committed
810
      glob_mi.pos = 4; // skip magic number
unknown's avatar
unknown committed
811
      glob_mi.pending = 0;
812 813 814 815 816 817
    }

  if(lex_mi->log_file_name)
    strmake(glob_mi.log_file_name, lex_mi->log_file_name,
	    sizeof(glob_mi.log_file_name));
  if(lex_mi->pos)
unknown's avatar
unknown committed
818
  {
819
    glob_mi.pos = lex_mi->pos;
unknown's avatar
unknown committed
820 821 822
    glob_mi.pending = 0;
  }
  
823
  if(lex_mi->host)
824 825 826
    {
      strmake(glob_mi.host, lex_mi->host, sizeof(glob_mi.host));
    }
827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870
  if(lex_mi->user)
    strmake(glob_mi.user, lex_mi->user, sizeof(glob_mi.user));
  if(lex_mi->password)
    strmake(glob_mi.password, lex_mi->password, sizeof(glob_mi.password));
  if(lex_mi->port)
    glob_mi.port = lex_mi->port;
  if(lex_mi->connect_retry)
    glob_mi.connect_retry = lex_mi->connect_retry;

  flush_master_info(&glob_mi);
  pthread_mutex_unlock(&glob_mi.lock);
  thd->proc_info = "starting slave";
  if(slave_was_running)
    start_slave(0,0);
  thd->proc_info = 0;

  send_ok(&thd->net);
  return 0;
}

void reset_master()
{
  if(!mysql_bin_log.is_open())
  {
    my_error(ER_FLUSH_MASTER_BINLOG_CLOSED,  MYF(ME_BELL+ME_WAITTANG));
    return;
  }

  LOG_INFO linfo;
  if (mysql_bin_log.find_first_log(&linfo, ""))
    return;

  for(;;)
  {
    my_delete(linfo.log_file_name, MYF(MY_WME));
    if (mysql_bin_log.find_next_log(&linfo))
      break;
  }
  mysql_bin_log.close(1); // exiting close
  my_delete(mysql_bin_log.get_index_fname(), MYF(MY_WME));
  mysql_bin_log.open(opt_bin_logname,LOG_BIN);

}

unknown's avatar
unknown committed
871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136
int cmp_master_pos(const char* log_file_name1, ulonglong log_pos1,
		   const char* log_file_name2, ulonglong log_pos2)
{
  int res;
  if ((res = strcmp(log_file_name1, log_file_name2)))
    return res;
  if (log_pos1 > log_pos2)
    return 1;
  else if (log_pos1 == log_pos2)
    return 0;
  return -1;
}

static inline int cmp_master_pos(Slave_log_event* sev, LEX_MASTER_INFO* mi)
{
  return cmp_master_pos(sev->master_log, sev->master_pos, mi->log_file_name,
			mi->pos);
}

static int find_target_pos(LEX_MASTER_INFO* mi, IO_CACHE* log, char* errmsg)
{
  uint32 log_seq = mi->last_log_seq;
  uint32 target_server_id = mi->server_id;
  
  for (;;)
  {
    Log_event* ev;
    if (!(ev = Log_event::read_log_event(log, 0)))
    {
      if (log->error > 0)
	strmov(errmsg, "Binary log truncated in the middle of event");
      else if(log->error < 0)
	strmov(errmsg, "I/O error reading binary log");
      else
	strmov(errmsg, "Could not find target event in the binary log");
      return 1;
    }

    if (ev->log_seq == log_seq && ev->server_id == target_server_id)
    {
      delete ev;
      mi->pos = my_b_tell(log);
      return 0;
    }

    delete ev;
  }
}

static void copy_base_name(char* dest, char* src)
{
  char* p;
  p = strrchr(src, FN_LIBCHAR);
  if (p)
    p++;
  else
    p = src;
  strmov(dest, p);
}

int translate_master(THD* thd, LEX_MASTER_INFO* mi, char* errmsg)
{
  LOG_INFO linfo;
  char search_file_name[FN_REFLEN],last_log_name[FN_REFLEN];
  IO_CACHE log, last_log;
  File file = -1, last_file = -1;
  pthread_mutex_t *log_lock;
  const char* errmsg_p;
  Slave_log_event* sev = 0;
  my_off_t last_pos = 0;
  int error = 1;
  int cmp_res;
  LINT_INIT(cmp_res);
  
  if (!mysql_bin_log.is_open())
  {
    strmov(errmsg,"Binary log is not open");
    return 1;
  }

  if (!server_id_supplied)
  {
    strmov(errmsg, "Misconfigured master - server id was not set");
    return 1;
  }
  
  linfo.index_file_offset = 0;
  thd->current_linfo = &linfo;
  search_file_name[0] = 0;

  if (mysql_bin_log.find_first_log(&linfo, search_file_name))
  {
    strmov(errmsg,"Could not find first log");
    return 1;
  }
  
  bzero((char*) &log,sizeof(log));
  log_lock = mysql_bin_log.get_log_lock();
  pthread_mutex_lock(log_lock);
  
  for (;;)
  {
    
    if ((file=open_binlog(&log, linfo.log_file_name, &errmsg_p)) < 0)
    {
      pthread_mutex_unlock(log_lock);
      strmov(errmsg, errmsg_p);
      goto err;
    }
    
    if (!(sev = find_slave_event(&log, linfo.log_file_name, errmsg)))
    {
      pthread_mutex_unlock(log_lock);
      goto err;
    }
    
    cmp_res = cmp_master_pos(sev, mi);
    delete sev;
    
    if(!cmp_res)
    {
      pthread_mutex_unlock(log_lock);
      copy_base_name(mi->log_file_name, linfo.log_file_name);
      mi->pos = my_b_tell(&log);
      goto mi_inited;
    }
    
    if (!last_pos && cmp_res > 0)
    {
      pthread_mutex_unlock(log_lock);
      strmov(errmsg, "Slave event in first log points past the \
target position");
      goto err;
    }

    if (last_pos && cmp_res > 0)
    {
      end_io_cache(&log);
      (void) my_close(file, MYF(MY_WME));
      if (init_io_cache(&log, (file = last_file), IO_SIZE, READ_CACHE, 0, 0,
			MYF(MY_WME)))
      {
	errmsg[0] = 0;
	goto err;
      }

      goto found_log;
    }
    
    strmov(last_log_name, linfo.log_file_name);
    last_pos = my_b_tell(&log);

    switch (mysql_bin_log.find_next_log(&linfo))
    {
    case LOG_INFO_EOF:
      if (last_file >= 0)
       (void)my_close(last_file, MYF(MY_WME));
      last_file = -1;
      goto found_log;
    case 0:
      break;
    default:
      pthread_mutex_unlock(log_lock);
      strmov(errmsg, "Error reading log index");
      goto err;
    }
    
    end_io_cache(&log);
    if (last_file >= 0)
     (void) my_close(last_file, MYF(MY_WME));
    last_file = file;
  }
  
found_log:
  my_b_seek(&log, last_pos);
  if (find_target_pos(mi,&log,errmsg))
  {
    pthread_mutex_unlock(log_lock);
    goto err;
  }
  pthread_mutex_unlock(log_lock);
  copy_base_name(mi->log_file_name, last_log_name);
mi_inited:  
  error = 0;
err:
  end_io_cache(&log);
  pthread_mutex_lock(&LOCK_thread_count);
  thd->current_linfo = 0;
  pthread_mutex_unlock(&LOCK_thread_count);
  if (file >= 0)
    (void) my_close(file, MYF(MY_WME));
  if (last_file >= 0 && last_file != file)
    (void) my_close(last_file, MYF(MY_WME));

  return error;
}

// caller must delete result when done
static Slave_log_event* find_slave_event(IO_CACHE* log,
					 const char* log_file_name,
					 char* errmsg)
{
  Log_event* ev;
  if (!(ev = Log_event::read_log_event(log, 0)))
  {
    my_vsnprintf(errmsg, SLAVE_ERRMSG_SIZE,
		 "Error reading start event in log '%s'",
		 (char*)log_file_name);
    return 0;
  }
    
  delete ev;
    
  if (!(ev = Log_event::read_log_event(log, 0)))
  {
    my_vsnprintf(errmsg, SLAVE_ERRMSG_SIZE,
		 "Error reading slave event in log '%s'",
		 (char*)log_file_name);
    return 0;
  }

  if (ev->get_type_code() != SLAVE_EVENT)
  {
    my_vsnprintf(errmsg, SLAVE_ERRMSG_SIZE,
		 "Second event in log '%s' is not slave event",
		 (char*)log_file_name);
    delete ev;
    return 0;
  }

  return (Slave_log_event*)ev;
}

int show_new_master(THD* thd)
{
  DBUG_ENTER("show_new_master");
  List<Item> field_list;
  char errmsg[SLAVE_ERRMSG_SIZE];
  LEX_MASTER_INFO* lex_mi = &thd->lex.mi;
  
  if (translate_master(thd, lex_mi, errmsg))
  {
    if (errmsg[0])
      net_printf(&thd->net, ER_SHOW_NEW_MASTER, errmsg);
    else
      send_error(&thd->net, 0);
    
    DBUG_RETURN(1);
  }
  else
  {
    String* packet = &thd->packet;
    field_list.push_back(new Item_empty_string("Log_name", 20));
    field_list.push_back(new Item_empty_string("Log_pos", 20));
    if (send_fields(thd, field_list, 1))
      DBUG_RETURN(-1);
    packet->length(0);
    net_store_data(packet, lex_mi->log_file_name);
    net_store_data(packet, (longlong)lex_mi->pos);
    if (my_net_write(&thd->net, packet->ptr(), packet->length()))
      DBUG_RETURN(-1);
    send_eof(&thd->net);
    DBUG_RETURN(0);
  }

}
unknown's avatar
unknown committed
1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234

int show_binlog_events(THD* thd)
{
  DBUG_ENTER("show_binlog_events");
  List<Item> field_list;
  const char* errmsg = 0;
  IO_CACHE log;
  File file = -1;
  
  Log_event::init_show_field_list(&field_list);  
  if (send_fields(thd, field_list, 1))
    DBUG_RETURN(-1);
  
  if (mysql_bin_log.is_open())
  {
    LOG_INFO linfo;
    char search_file_name[FN_REFLEN];
    LEX_MASTER_INFO* lex_mi = &thd->lex.mi;
    uint event_count, limit_start, limit_end;
    const char* log_file_name = lex_mi->log_file_name;
    Log_event* ev;
    ulong pos = (ulong) lex_mi->pos;
      
    limit_start = thd->lex.select->offset_limit;
    limit_end = thd->lex.select->select_limit + limit_start;

    if (log_file_name)
      mysql_bin_log.make_log_name(search_file_name, log_file_name);
    else
      search_file_name[0] = 0;

    linfo.index_file_offset = 0;
    thd->current_linfo = &linfo;
    
    if (mysql_bin_log.find_first_log(&linfo, search_file_name))
    {
      errmsg = "Could not find target log";
      goto err;
    }

    if ((file=open_binlog(&log, linfo.log_file_name, &errmsg)) < 0)
      goto err;

    if (pos < 4)
    {
      errmsg = "Invalid log position";
      goto err;
    }

    pthread_mutex_lock(mysql_bin_log.get_log_lock());
    my_b_seek(&log, pos);

    for (event_count = 0;
	(ev = Log_event::read_log_event(&log, 0));)
    {
      if (event_count >= limit_start &&
	   ev->net_send(thd, linfo.log_file_name, pos))
	{
	  errmsg = "Net error";
	  delete ev;
	  pthread_mutex_unlock(mysql_bin_log.get_log_lock());
          goto err;
	}
      
      pos = my_b_tell(&log);	
      delete ev;

      if (++event_count >= limit_end)
	break;
    }

    if (event_count < limit_end && log.error)
    {
      errmsg = "Wrong offset or I/O error";
      goto err;
    }
    
    pthread_mutex_unlock(mysql_bin_log.get_log_lock());
  }

err:
  if (file >= 0)
  {
    end_io_cache(&log);
    (void) my_close(file, MYF(MY_WME));
  }
  
  if (errmsg)
  {
    net_printf(&thd->net, ER_SHOW_BINLOG_EVENTS, errmsg);
    DBUG_RETURN(1);
  }

  send_eof(&thd->net);
  DBUG_RETURN(0);
}


1235 1236 1237 1238 1239 1240
int show_slave_hosts(THD* thd)
{
  DBUG_ENTER("show_slave_hosts");
  List<Item> field_list;
  field_list.push_back(new Item_empty_string("Server_id", 20));
  field_list.push_back(new Item_empty_string("Host", 20));
1241 1242 1243 1244 1245
  if(opt_show_slave_auth_info)
  {
    field_list.push_back(new Item_empty_string("User",20));
    field_list.push_back(new Item_empty_string("Password",20));
  }
1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261
  field_list.push_back(new Item_empty_string("Port",20));

  if(send_fields(thd, field_list, 1))
    DBUG_RETURN(-1);
  String* packet = &thd->packet;
  uint i;
  NET* net = &thd->net;

  pthread_mutex_lock(&LOCK_slave_list);
  
  for(i = 0; i < slave_list.records; ++i)
  {
    SLAVE_INFO* si = (SLAVE_INFO*)hash_element(&slave_list, i);
    packet->length(0);
    net_store_data(packet, si->server_id);
    net_store_data(packet, si->host);
1262 1263 1264 1265 1266
    if(opt_show_slave_auth_info)
    {
      net_store_data(packet, si->user);
      net_store_data(packet, si->password);
    }
1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278
    net_store_data(packet, (uint)si->port);
    if(my_net_write(net, (char*)packet->ptr(), packet->length()))
    {
      pthread_mutex_unlock(&LOCK_slave_list);
      DBUG_RETURN(-1);
    }
  }
  pthread_mutex_unlock(&LOCK_slave_list);
  send_eof(net);
  DBUG_RETURN(0);
}

1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296
int show_binlog_info(THD* thd)
{
  DBUG_ENTER("show_binlog_info");
  List<Item> field_list;
  field_list.push_back(new Item_empty_string("File", FN_REFLEN));
  field_list.push_back(new Item_empty_string("Position",20));
  field_list.push_back(new Item_empty_string("Binlog_do_db",20));
  field_list.push_back(new Item_empty_string("Binlog_ignore_db",20));

  if(send_fields(thd, field_list, 1))
    DBUG_RETURN(-1);
  String* packet = &thd->packet;
  packet->length(0);

  if(mysql_bin_log.is_open())
    {
      LOG_INFO li;
      mysql_bin_log.get_current_log(&li);
unknown's avatar
unknown committed
1297 1298
      int dir_len = dirname_length(li.log_file_name);
      net_store_data(packet, li.log_file_name + dir_len);
1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316
      net_store_data(packet, (longlong)li.pos);
      net_store_data(packet, &binlog_do_db);
      net_store_data(packet, &binlog_ignore_db);
    }
  else
    {
      net_store_null(packet);
      net_store_null(packet);
      net_store_null(packet);
      net_store_null(packet);
    }

  if(my_net_write(&thd->net, (char*)thd->packet.ptr(), packet->length()))
    DBUG_RETURN(-1);

  send_eof(&thd->net);
  DBUG_RETURN(0);
}
unknown's avatar
unknown committed
1317 1318 1319 1320

int show_binlogs(THD* thd)
{
  const char* errmsg = 0;
1321
  File index_file;
unknown's avatar
unknown committed
1322 1323 1324 1325
  char fname[FN_REFLEN];
  NET* net = &thd->net;
  List<Item> field_list;
  String* packet = &thd->packet;
1326 1327
  IO_CACHE io_cache;
  uint length;
unknown's avatar
unknown committed
1328 1329
  
  if(!mysql_bin_log.is_open())
1330 1331 1332 1333
  {
    errmsg = "binlog is not open";
    goto err;
  }
unknown's avatar
unknown committed
1334 1335 1336

  field_list.push_back(new Item_empty_string("Log_name", 128));
  if(send_fields(thd, field_list, 1))
1337 1338 1339 1340
  {
    sql_print_error("Failed in send_fields");
    return 1;
  }
unknown's avatar
unknown committed
1341 1342 1343
  
  mysql_bin_log.lock_index();
  index_file = mysql_bin_log.get_index_file();
1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361
  if (index_file < 0)
  {
    errmsg = "Uninitialized index file pointer";
    goto err2;
  }
  if (init_io_cache(&io_cache, index_file, IO_SIZE, READ_CACHE, 0, 0,
		   MYF(MY_WME)))
  {
    errmsg = "Failed on init_io_cache()";
    goto err2;
  }
  while ((length=my_b_gets(&io_cache, fname, sizeof(fname))))
  {
    fname[--length]=0;
    int dir_len = dirname_length(fname);
    packet->length(0);
    net_store_data(packet, fname + dir_len, length-dir_len);
    if(my_net_write(net, (char*) packet->ptr(), packet->length()))
unknown's avatar
unknown committed
1362
    {
1363 1364 1365 1366
      sql_print_error("Failed in my_net_write");
      end_io_cache(&io_cache);
      mysql_bin_log.unlock_index();
      return 1;
unknown's avatar
unknown committed
1367
    }
1368
  }
unknown's avatar
unknown committed
1369 1370
  
  mysql_bin_log.unlock_index();
1371
  end_io_cache(&io_cache);
unknown's avatar
unknown committed
1372 1373
  send_eof(net);   
  return 0;
1374 1375 1376 1377 1378 1379 1380

err2:
  mysql_bin_log.unlock_index();
  end_io_cache(&io_cache);
err:
  send_error(net, 0, errmsg);
  return 1;
unknown's avatar
unknown committed
1381 1382
}

1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 1417 1418 1419
int connect_to_master(THD *thd, MYSQL* mysql, MASTER_INFO* mi)
{
  if(!mc_mysql_connect(mysql, mi->host, mi->user, mi->password, 0,
		   mi->port, 0, 0))
  {
    sql_print_error("Connection to master failed: %s",
		    mc_mysql_error(mysql));
    return 1;
  }
  return 0;
}

static inline void cleanup_mysql_results(MYSQL_RES* db_res,
				  MYSQL_RES** cur, MYSQL_RES** start)
{
  for( ; cur >= start; --cur)
    if(*cur)
      mc_mysql_free_result(*cur);
  mc_mysql_free_result(db_res);
}

static inline int fetch_db_tables(THD* thd, MYSQL* mysql, const char* db,
				  MYSQL_RES* table_res)
{
  MYSQL_ROW row;
  
  for( row = mc_mysql_fetch_row(table_res); row;
       row = mc_mysql_fetch_row(table_res))
  {
    TABLE_LIST table;
    const char* table_name = row[0];
    int error;
    if(table_rules_on)
    {
      table.next = 0;
      table.db = (char*)db;
      table.real_name = (char*)table_name;
unknown's avatar
unknown committed
1420
      table.updating = 1;
1421 1422 1423 1424 1425 1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 1471 1472 1473 1474 1475 1476 1477 1478 1479 1480 1481 1482 1483 1484 1485 1486 1487 1488 1489 1490 1491 1492 1493 1494 1495 1496 1497 1498 1499 1500 1501 1502 1503 1504 1505 1506 1507 1508 1509 1510 1511 1512 1513 1514 1515 1516 1517 1518 1519 1520 1521 1522 1523 1524 1525 1526 1527 1528 1529 1530 1531 1532 1533 1534 1535 1536 1537 1538 1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 1549 1550 1551 1552 1553 1554 1555 1556 1557 1558 1559 1560 1561 1562 1563 1564 1565 1566 1567 1568 1569 1570 1571 1572 1573 1574 1575 1576 1577 1578 1579 1580 1581 1582 1583 1584 1585 1586 1587 1588 1589 1590 1591 1592 1593 1594 1595 1596 1597 1598
      if(!tables_ok(thd, &table))
	continue;
    }
    
    if((error = fetch_nx_table(thd, db, table_name, &glob_mi, mysql)))
      return error;
  }

  return 0;
}

int load_master_data(THD* thd)
{
  MYSQL mysql;
  MYSQL_RES* master_status_res = 0;
  bool slave_was_running = 0;
  int error = 0;
  
  mc_mysql_init(&mysql);

  pthread_mutex_lock(&LOCK_slave);
  // we do not want anyone messing with the slave at all for the entire
  // duration of the data load;

  // first, kill the slave
  if((slave_was_running = slave_running))
  {
    abort_slave = 1;
    thr_alarm_kill(slave_real_id);
    thd->proc_info = "waiting for slave to die";
    while(slave_running)
      pthread_cond_wait(&COND_slave_stopped, &LOCK_slave); // wait until done
  }
  

  if(connect_to_master(thd, &mysql, &glob_mi))
  {
    net_printf(&thd->net, error = ER_CONNECT_TO_MASTER,
		 mc_mysql_error(&mysql));
    goto err;
  }

  // now that we are connected, get all database and tables in each
  {
    MYSQL_RES *db_res, **table_res, **table_res_end, **cur_table_res;
    uint num_dbs;
    MYSQL_ROW row;
    
    if(mc_mysql_query(&mysql, "show databases", 0) ||
       !(db_res = mc_mysql_store_result(&mysql)))
    {
      net_printf(&thd->net, error = ER_QUERY_ON_MASTER,
		 mc_mysql_error(&mysql));
      goto err;
    }

    if(!(num_dbs = mc_mysql_num_rows(db_res)))
      goto err;
    // in theory, the master could have no databases at all
    // and run with skip-grant
    
    if(!(table_res = (MYSQL_RES**)thd->alloc(num_dbs * sizeof(MYSQL_RES*))))
    {
      net_printf(&thd->net, error = ER_OUTOFMEMORY);
      goto err;
    }

    // this is a temporary solution until we have online backup
    // capabilities - to be replaced once online backup is working
    // we wait to issue FLUSH TABLES WITH READ LOCK for as long as we
    // can to minimize the lock time
    if(mc_mysql_query(&mysql, "FLUSH TABLES WITH READ LOCK", 0)
       || mc_mysql_query(&mysql, "SHOW MASTER STATUS",0) ||
       !(master_status_res = mc_mysql_store_result(&mysql)))
    {
      net_printf(&thd->net, error = ER_QUERY_ON_MASTER,
		 mc_mysql_error(&mysql));
      goto err;
    }
    
    // go through every table in every database, and if the replication
    // rules allow replicating it, get it

    table_res_end = table_res + num_dbs;

    for(cur_table_res = table_res; cur_table_res < table_res_end;
	++cur_table_res)
    {
      MYSQL_ROW row = mc_mysql_fetch_row(db_res);
      // since we know how many rows we have, this can never be NULL

      char* db = row[0];
      int drop_error = 0;

      // do not replicate databases excluded by rules
      // also skip mysql database - in most cases the user will
      // mess up and not exclude mysql database with the rules when
      // he actually means to - in this case, he is up for a surprise if
      // his priv tables get dropped and downloaded from master
      // TO DO - add special option, not enabled
      // by default, to allow inclusion of mysql database into load
      // data from master
      if(!db_ok(db, replicate_do_db, replicate_ignore_db) ||
	 !strcmp(db,"mysql"))
      {
	*cur_table_res = 0;
	continue;
      }
      
      if((drop_error = mysql_rm_db(0, db, 1)) ||
	 mysql_create_db(0, db, 0))
      {
	error = (drop_error) ? ER_DB_DROP_DELETE : ER_CANT_CREATE_DB;
	net_printf(&thd->net, error, db, my_error);
	cleanup_mysql_results(db_res, cur_table_res - 1, table_res);
	goto err;
      }

      if(mc_mysql_select_db(&mysql, db) ||
	 mc_mysql_query(&mysql, "show tables", 0) ||
	 !(*cur_table_res = mc_mysql_store_result(&mysql)))
      {
	net_printf(&thd->net, error = ER_QUERY_ON_MASTER,
		   mc_mysql_error(&mysql));
	cleanup_mysql_results(db_res, cur_table_res - 1, table_res);
	goto err;
      }

      if((error = fetch_db_tables(thd, &mysql, db, *cur_table_res)))
      {
	// we do not report the error - fetch_db_tables handles it
	cleanup_mysql_results(db_res, cur_table_res, table_res);
	goto err;
      }
    }

    cleanup_mysql_results(db_res, cur_table_res - 1, table_res);

    // adjust position in the master
    if(master_status_res)
    {
      MYSQL_ROW row = mc_mysql_fetch_row(master_status_res);

      // we need this check because the master may not be running with
      // log-bin, but it will still allow us to do all the steps
      // of LOAD DATA FROM MASTER - no reason to forbid it, really,
      // although it does not make much sense for the user to do it 
      if(row[0] && row[1])
      {
	strmake(glob_mi.log_file_name, row[0], sizeof(glob_mi.log_file_name));
	glob_mi.pos = atoi(row[1]); // atoi() is ok, since offset is <= 1GB
	if(glob_mi.pos < 4)
	  glob_mi.pos = 4; // don't hit the magic number
	glob_mi.pending = 0;
	flush_master_info(&glob_mi);
      }

      mc_mysql_free_result(master_status_res);
    }
    
    if(mc_mysql_query(&mysql, "UNLOCK TABLES", 0))
    {
      net_printf(&thd->net, error = ER_QUERY_ON_MASTER,
		 mc_mysql_error(&mysql));
      goto err;
    }
  }
err:  
  pthread_mutex_unlock(&LOCK_slave);
  if(slave_was_running)
    start_slave(0, 0);
  mc_mysql_close(&mysql); // safe to call since we always do mc_mysql_init()
  if(!error)
    send_ok(&thd->net);
  
  return error;
}

unknown's avatar
unknown committed
1599 1600