slave.cc 38.6 KB
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/* 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 */


#include "mysql_priv.h"
#include <mysql.h>
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#include <myisam.h>
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#include "mini_client.h"
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#include "slave.h"
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#include "sql_repl.h"
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#include "repl_failsafe.h"
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#include <thr_alarm.h>
#include <my_dir.h>

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volatile bool slave_running = 0;
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char* slave_load_tmpdir = 0;
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pthread_t slave_real_id;
MASTER_INFO glob_mi;
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HASH replicate_do_table, replicate_ignore_table;
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DYNAMIC_ARRAY replicate_wild_do_table, replicate_wild_ignore_table;
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bool do_table_inited = 0, ignore_table_inited = 0;
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bool wild_do_table_inited = 0, wild_ignore_table_inited = 0;
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bool table_rules_on = 0;
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uint32 slave_skip_counter = 0; 
static TABLE* save_temporary_tables = 0;
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THD* slave_thd = 0;
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// when slave thread exits, we need to remember the temporary tables so we
// can re-use them on slave start
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int last_slave_errno = 0;
char last_slave_error[MAX_SLAVE_ERRMSG] = "";
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#ifndef DBUG_OFF
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int disconnect_slave_event_count = 0, abort_slave_event_count = 0;
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static int events_till_disconnect = -1;
int events_till_abort = -1;
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static int stuck_count = 0;
#endif
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void skip_load_data_infile(NET* net);
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inline bool slave_killed(THD* thd);
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static int init_slave_thread(THD* thd);
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static int safe_connect(THD* thd, MYSQL* mysql, MASTER_INFO* mi);
static int safe_reconnect(THD* thd, MYSQL* mysql, MASTER_INFO* mi);
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static int connect_to_master(THD* thd, MYSQL* mysql, MASTER_INFO* mi,
			     bool reconnect);
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static int safe_sleep(THD* thd, int sec);
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static int request_table_dump(MYSQL* mysql, const char* db, const char* table);
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static int create_table_from_dump(THD* thd, NET* net, const char* db,
				  const char* table_name);
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static int check_master_version(MYSQL* mysql, MASTER_INFO* mi);

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char* rewrite_db(char* db);
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static void free_table_ent(TABLE_RULE_ENT* e)
{
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  my_free((gptr) e, MYF(0));
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}

static byte* get_table_key(TABLE_RULE_ENT* e, uint* len,
			   my_bool not_used __attribute__((unused)))
{
  *len = e->key_len;
  return (byte*)e->db;
}


void init_table_rule_hash(HASH* h, bool* h_inited)
{
  hash_init(h, TABLE_RULE_HASH_SIZE,0,0,
	    (hash_get_key) get_table_key,
	    (void (*)(void*)) free_table_ent, 0);
  *h_inited = 1;
}
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void init_table_rule_array(DYNAMIC_ARRAY* a, bool* a_inited)
{
  init_dynamic_array(a, sizeof(TABLE_RULE_ENT*), TABLE_RULE_ARR_SIZE,
		     TABLE_RULE_ARR_SIZE);
  *a_inited = 1;
}

static TABLE_RULE_ENT* find_wild(DYNAMIC_ARRAY *a, const char* key, int len)
{
  uint i;
  const char* key_end = key + len;
  
  for(i = 0; i < a->elements; i++)
    {
      TABLE_RULE_ENT* e ;
      get_dynamic(a, (gptr)&e, i);
      if(!wild_case_compare(key, key_end, (const char*)e->db,
			    (const char*)(e->db + e->key_len),'\\'))
	return e;
    }
  
  return 0;
}

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int tables_ok(THD* thd, TABLE_LIST* tables)
{
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  for (; tables; tables = tables->next)
  {
    if (!tables->updating) 
      continue;
    char hash_key[2*NAME_LEN+2];
    char* p;
    p = strmov(hash_key, tables->db ? tables->db : thd->db);
    *p++ = '.';
    uint len = strmov(p, tables->real_name) - hash_key ;
    if (do_table_inited) // if there are any do's
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    {
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      if (hash_search(&replicate_do_table, (byte*) hash_key, len))
	return 1;
    }
    if (ignore_table_inited) // if there are any do's
    {
      if (hash_search(&replicate_ignore_table, (byte*) hash_key, len))
	return 0; 
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    }
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    if (wild_do_table_inited && find_wild(&replicate_wild_do_table,
					  hash_key, len))
      return 1;
    if (wild_ignore_table_inited && find_wild(&replicate_wild_ignore_table,
					      hash_key, len))
      return 0;
  }
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  // if no explicit rule found
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  // and there was a do list, do not replicate. If there was
  // no do list, go ahead
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  return !do_table_inited && !wild_do_table_inited;
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}


int add_table_rule(HASH* h, const char* table_spec)
{
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  const char* dot = strchr(table_spec, '.');
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  if(!dot) return 1;
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  // len is always > 0 because we know the there exists a '.'
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  uint len = (uint)strlen(table_spec);
  TABLE_RULE_ENT* e = (TABLE_RULE_ENT*)my_malloc(sizeof(TABLE_RULE_ENT)
						 + len, MYF(MY_WME));
  if(!e) return 1;
  e->db = (char*)e + sizeof(TABLE_RULE_ENT);
  e->tbl_name = e->db + (dot - table_spec) + 1;
  e->key_len = len;
  memcpy(e->db, table_spec, len);
  (void)hash_insert(h, (byte*)e);
  return 0;
}

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int add_wild_table_rule(DYNAMIC_ARRAY* a, const char* table_spec)
{
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  const char* dot = strchr(table_spec, '.');
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  if(!dot) return 1;
  uint len = (uint)strlen(table_spec);
  TABLE_RULE_ENT* e = (TABLE_RULE_ENT*)my_malloc(sizeof(TABLE_RULE_ENT)
						 + len, MYF(MY_WME));
  if(!e) return 1;
  e->db = (char*)e + sizeof(TABLE_RULE_ENT);
  e->tbl_name = e->db + (dot - table_spec) + 1;
  e->key_len = len;
  memcpy(e->db, table_spec, len);
  insert_dynamic(a, (gptr)&e);
  return 0;
}

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static void free_string_array(DYNAMIC_ARRAY *a)
{
  uint i;
  for(i = 0; i < a->elements; i++)
    {
      char* p;
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      get_dynamic(a, (gptr) &p, i);
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      my_free(p, MYF(MY_WME));
    }
  delete_dynamic(a);
}

void end_slave()
{
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  pthread_mutex_lock(&LOCK_slave);
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  if (slave_running)
  {
    abort_slave = 1;
    thr_alarm_kill(slave_real_id);
#ifdef SIGNAL_WITH_VIO_CLOSE
    slave_thd->close_active_vio();
#endif    
    while (slave_running)
      pthread_cond_wait(&COND_slave_stopped, &LOCK_slave);
  }
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  pthread_mutex_unlock(&LOCK_slave);
  
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  end_master_info(&glob_mi);
  if(do_table_inited)
    hash_free(&replicate_do_table);
  if(ignore_table_inited)
    hash_free(&replicate_ignore_table);
  if(wild_do_table_inited)
    free_string_array(&replicate_wild_do_table);
  if(wild_ignore_table_inited)
    free_string_array(&replicate_wild_ignore_table);
}
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inline bool slave_killed(THD* thd)
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{
  return abort_slave || abort_loop || thd->killed;
}

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void slave_print_error(int err_code, const char* msg, ...)
{
  va_list args;
  va_start(args,msg);
  my_vsnprintf(last_slave_error, sizeof(last_slave_error), msg, args);
  sql_print_error("Slave: %s, error_code=%d", last_slave_error, err_code);
  last_slave_errno = err_code;
}

void skip_load_data_infile(NET* net)
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{
  (void)my_net_write(net, "\xfb/dev/null", 10);
  (void)net_flush(net);
  (void)my_net_read(net); // discard response
  send_ok(net); // the master expects it
}

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char* rewrite_db(char* db)
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{
  if(replicate_rewrite_db.is_empty() || !db) return db;
  I_List_iterator<i_string_pair> it(replicate_rewrite_db);
  i_string_pair* tmp;

  while((tmp=it++))
    {
      if(!strcmp(tmp->key, db))
	return tmp->val;
    }

  return db;
}
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int db_ok(const char* db, I_List<i_string> &do_list,
	  I_List<i_string> &ignore_list )
{
  if(do_list.is_empty() && ignore_list.is_empty())
    return 1; // ok to replicate if the user puts no constraints

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  // if the user has specified restrictions on which databases to replicate
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  // and db was not selected, do not replicate
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  if(!db)
    return 0;
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  if(!do_list.is_empty()) // if the do's are not empty
    {
      I_List_iterator<i_string> it(do_list);
      i_string* tmp;

      while((tmp=it++))
	{
	  if(!strcmp(tmp->ptr, db))
	    return 1; // match
	}
      return 0;
    }
  else // there are some elements in the don't, otherwise we cannot get here
    {
      I_List_iterator<i_string> it(ignore_list);
      i_string* tmp;

      while((tmp=it++))
	{
	  if(!strcmp(tmp->ptr, db))
	    return 0; // match
	}
      
      return 1;
    }
}

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static int init_strvar_from_file(char* var, int max_size, IO_CACHE* f,
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			       char* default_val)
{
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  uint length;
  if ((length=my_b_gets(f,var, max_size)))
  {
    char* last_p = var + length -1;
    if (*last_p == '\n')
      *last_p = 0; // if we stopped on newline, kill it
    else
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    {
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      // if we truncated a line or stopped on last char, remove all chars
      // up to and including newline
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      int c;
      while( ((c=my_b_get(f)) != '\n' && c != my_b_EOF));
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    }
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    return 0;
  }
  else if (default_val)
  {
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    strmake(var,  default_val, max_size-1);
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    return 0;
  }
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  return 1;
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}

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static int init_intvar_from_file(int* var, IO_CACHE* f, int default_val)
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{
  char buf[32];
  
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  if (my_b_gets(f, buf, sizeof(buf))) 
  {
    *var = atoi(buf);
    return 0;
  }
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  else if(default_val)
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  {
    *var = default_val;
    return 0;
  }
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  return 1;
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}

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static int check_master_version(MYSQL* mysql, MASTER_INFO* mi)
{
  MYSQL_RES* res;
  MYSQL_ROW row;
  const char* version;
  const char* errmsg = 0;
  
  if (mc_mysql_query(mysql, "SELECT VERSION()", 0)
      || !(res = mc_mysql_store_result(mysql)))
  {
    sql_print_error("Error checking master version: %s",
		    mc_mysql_error(mysql));
    return 1;
  }
  if (!(row = mc_mysql_fetch_row(res)))
  {
    errmsg = "Master returned no rows for SELECT VERSION()";
    goto err;
  }
  if (!(version = row[0]))
  {
    errmsg = "Master reported NULL for the version";
    goto err;
  }
  
  switch (*version)
  {
  case '3':
    mi->old_format = 1;
    break;
  case '4':
    mi->old_format = 0;
    break;
  default:
    errmsg = "Master reported unrecognized MySQL version";
    goto err;
  }
err:
  if (res)
    mc_mysql_free_result(res);
  if (errmsg)
  {
    sql_print_error(errmsg);
    return 1;
  }
  return 0;
}

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static int create_table_from_dump(THD* thd, NET* net, const char* db,
				  const char* table_name)
{
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  ulong packet_len = my_net_read(net); // read create table statement
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  Vio* save_vio;
  HA_CHECK_OPT check_opt;
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  TABLE_LIST tables;
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  int error= 1;
  handler *file;
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  uint save_options;
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  if (packet_len == packet_error)
  {
    send_error(&thd->net, ER_MASTER_NET_READ);
    return 1;
  }
  if (net->read_pos[0] == 255) // error from master
  {
    net->read_pos[packet_len] = 0;
    net_printf(&thd->net, ER_MASTER, net->read_pos + 3);
    return 1;
  }
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  thd->command = COM_TABLE_DUMP;
  thd->query = sql_alloc(packet_len + 1);
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  if (!thd->query)
  {
    sql_print_error("create_table_from_dump: out of memory");
    net_printf(&thd->net, ER_GET_ERRNO, "Out of memory");
    return 1;
  }
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  memcpy(thd->query, net->read_pos, packet_len);
  thd->query[packet_len] = 0;
  thd->current_tablenr = 0;
  thd->query_error = 0;
  thd->net.no_send_ok = 1;
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  /* we do not want to log create table statement */
  save_options = thd->options;
  thd->options &= ~OPTION_BIN_LOG;
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  thd->proc_info = "Creating table from master dump";
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  // save old db in case we are creating in a different database
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  char* save_db = thd->db;
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  thd->db = (char*)db;
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  mysql_parse(thd, thd->query, packet_len); // run create table
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  thd->db = save_db;		// leave things the way the were before
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  thd->options = save_options;
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  if (thd->query_error)
    goto err;			// mysql_parse took care of the error send
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  bzero((char*) &tables,sizeof(tables));
  tables.db = (char*)db;
  tables.name = tables.real_name = (char*)table_name;
  tables.lock_type = TL_WRITE;
  thd->proc_info = "Opening master dump table";
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  if (!open_ltable(thd, &tables, TL_WRITE))
  {
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    send_error(&thd->net,0,0);			// Send error from open_ltable
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    sql_print_error("create_table_from_dump: could not open created table");
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    goto err;
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  }
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  file = tables.table->file;
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  thd->proc_info = "Reading master dump table data";
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  if (file->net_read_dump(net))
  {
    net_printf(&thd->net, ER_MASTER_NET_READ);
    sql_print_error("create_table_from_dump::failed in\
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 handler::net_read_dump()");
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    goto err;
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  }
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  check_opt.init();
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  check_opt.flags|= T_VERY_SILENT | T_CALC_CHECKSUM;
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  check_opt.quick = 1;
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  thd->proc_info = "Rebuilding the index on master dump table";
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  // we do not want repair() to spam us with messages
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  // just send them to the error log, and report the failure in case of
  // problems
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  save_vio = thd->net.vio;
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  thd->net.vio = 0;
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  error=file->repair(thd,&check_opt) != 0;
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  thd->net.vio = save_vio;
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  if (error)
    net_printf(&thd->net, ER_INDEX_REBUILD,tables.table->real_name);

err:
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  close_thread_tables(thd);
  thd->net.no_send_ok = 0;
  return error; 
}

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int fetch_nx_table(THD* thd, const char* db_name, const char* table_name,
		   MASTER_INFO* mi, MYSQL* mysql)
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{
  int error = 1;
  int nx_errno = 0;
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  bool called_connected = (mysql != NULL);
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  if (!called_connected && !(mysql = mc_mysql_init(NULL)))
  { 
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    sql_print_error("fetch_nx_table: Error in mysql_init()");
    nx_errno = ER_GET_ERRNO;
    goto err;
  }
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  if (!called_connected)
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  {
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    if (connect_to_master(thd, mysql, mi))
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    {
      sql_print_error("Could not connect to master while fetching table\
 '%-64s.%-64s'", db_name, table_name);
      nx_errno = ER_CONNECT_TO_MASTER;
      goto err;
    }
  }
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  if (slave_killed(thd))
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    goto err;

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  if (request_table_dump(mysql, db_name, table_name))
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  {
    nx_errno = ER_GET_ERRNO;
    sql_print_error("fetch_nx_table: failed on table dump request ");
    goto err;
  }
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merge  
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  if (create_table_from_dump(thd, &mysql->net, db_name,
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			    table_name))
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  { 
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    // create_table_from_dump will have sent the error alread
    sql_print_error("fetch_nx_table: failed on create table ");
    goto err;
  }
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  error = 0;
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 err:
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  if (mysql && !called_connected)
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    mc_mysql_close(mysql);
  if (nx_errno && thd->net.vio)
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    send_error(&thd->net, nx_errno, "Error in fetch_nx_table");
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  thd->net.no_send_ok = 0; // Clear up garbage after create_table_from_dump
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  return error;
}

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void end_master_info(MASTER_INFO* mi)
{
  if(mi->fd >= 0)
    {
      end_io_cache(&mi->file);
      (void)my_close(mi->fd, MYF(MY_WME));
      mi->fd = -1;
    }
  mi->inited = 0;
}

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int init_master_info(MASTER_INFO* mi)
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{
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  if (mi->inited)
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    return 0;
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  int fd,length,error;
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  MY_STAT stat_area;
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  char fname[FN_REFLEN+128];
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  const char *msg;
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  fn_format(fname, master_info_file, mysql_data_home, "", 4+32);
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  // we need a mutex while we are changing master info parameters to
  // keep other threads from reading bogus info

  pthread_mutex_lock(&mi->lock);
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  mi->pending = 0;
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  fd = mi->fd;
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  // we do not want any messages if the file does not exist
  if (!my_stat(fname, &stat_area, MYF(0)))
  {
    // if someone removed the file from underneath our feet, just close
    // the old descriptor and re-create the old file
    if (fd >= 0)
      my_close(fd, MYF(MY_WME));
    if ((fd = my_open(fname, O_CREAT|O_RDWR|O_BINARY, MYF(MY_WME))) < 0
	|| init_io_cache(&mi->file, fd, IO_SIZE*2, READ_CACHE, 0L,0,
			 MYF(MY_WME)))
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    {
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      if(fd >= 0)
	my_close(fd, MYF(0));
      pthread_mutex_unlock(&mi->lock);
      return 1;
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    }
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    mi->log_file_name[0] = 0;
    mi->pos = 4; // skip magic number
    mi->fd = fd;
      
    if (master_host)
      strmake(mi->host, master_host, sizeof(mi->host) - 1);
    if (master_user)
      strmake(mi->user, master_user, sizeof(mi->user) - 1);
    if (master_password)
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      strmake(mi->password, master_password, HASH_PASSWORD_LENGTH);
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    mi->port = master_port;
    mi->connect_retry = master_connect_retry;
  }
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  else // file exists
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  {
    if(fd >= 0)
      reinit_io_cache(&mi->file, READ_CACHE, 0L,0,0);
    else if((fd = my_open(fname, O_RDWR|O_BINARY, MYF(MY_WME))) < 0
	    || init_io_cache(&mi->file, fd, IO_SIZE*2, READ_CACHE, 0L,
			     0, MYF(MY_WME)))
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    {
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      if(fd >= 0)
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	my_close(fd, MYF(0));
      pthread_mutex_unlock(&mi->lock);
      return 1;
    }
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    if ((length=my_b_gets(&mi->file, mi->log_file_name,
			   sizeof(mi->log_file_name))) < 1)
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    {
      msg="Error reading log file name from master info file ";
      goto error;
    }
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    mi->log_file_name[length-1]= 0; // kill \n
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    /* Reuse fname buffer */
    if(!my_b_gets(&mi->file, fname, sizeof(fname)))
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    {
      msg="Error reading log file position from master info file";
      goto error;
    }
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    mi->pos = strtoull(fname,(char**) 0, 10);
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    mi->fd = fd;
    if(init_strvar_from_file(mi->host, sizeof(mi->host), &mi->file,
			     master_host) ||
       init_strvar_from_file(mi->user, sizeof(mi->user), &mi->file,
			     master_user) || 
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       init_strvar_from_file(mi->password, HASH_PASSWORD_LENGTH+1, &mi->file,
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			     master_password) ||
       init_intvar_from_file((int*)&mi->port, &mi->file, master_port) ||
       init_intvar_from_file((int*)&mi->connect_retry, &mi->file,
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			     master_connect_retry) ||
       init_intvar_from_file((int*)&mi->last_log_seq, &mi->file, 0)
       )
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    {
      msg="Error reading master configuration";
      goto error;
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    }
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  }
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  mi->inited = 1;
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  // now change the cache from READ to WRITE - must do this
  // before flush_master_info
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  reinit_io_cache(&mi->file, WRITE_CACHE,0L,0,1);
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  error=test(flush_master_info(mi));
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  pthread_mutex_unlock(&mi->lock);
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  return error;

error:
  sql_print_error(msg);
  end_io_cache(&mi->file);
  my_close(fd, MYF(0));
  pthread_mutex_unlock(&mi->lock);
  return 1;
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}

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int register_slave_on_master(MYSQL* mysql)
{
  String packet;
  char buf[4];

  if(!report_host)
    return 0;
  
  int4store(buf, server_id);
  packet.append(buf, 4);

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  net_store_data(&packet, report_host); 
  if(report_user)
    net_store_data(&packet, report_user);
  else
    packet.append((char)0);
  
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  if(report_password)
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    net_store_data(&packet, report_user);
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  else
    packet.append((char)0);

  int2store(buf, (uint16)report_port);
  packet.append(buf, 2);
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  int4store(buf, rpl_recovery_rank);
  packet.append(buf, 4);
  int4store(buf, 0); /* tell the master will fill in master_id */
  packet.append(buf, 4);
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  if(mc_simple_command(mysql, COM_REGISTER_SLAVE, (char*)packet.ptr(),
		       packet.length(), 0))
  {
    sql_print_error("Error on COM_REGISTER_SLAVE: '%s'",
		    mc_mysql_error(mysql));
    return 1;
  }

  return 0;
}


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int show_master_info(THD* thd)
{
  DBUG_ENTER("show_master_info");
  List<Item> field_list;
  field_list.push_back(new Item_empty_string("Master_Host",
						     sizeof(glob_mi.host)));
  field_list.push_back(new Item_empty_string("Master_User",
						     sizeof(glob_mi.user)));
  field_list.push_back(new Item_empty_string("Master_Port", 6));
  field_list.push_back(new Item_empty_string("Connect_retry", 6));
  field_list.push_back( new Item_empty_string("Log_File",
						     FN_REFLEN));
  field_list.push_back(new Item_empty_string("Pos", 12));
  field_list.push_back(new Item_empty_string("Slave_Running", 3));
  field_list.push_back(new Item_empty_string("Replicate_do_db", 20));
  field_list.push_back(new Item_empty_string("Replicate_ignore_db", 20));
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  field_list.push_back(new Item_empty_string("Last_errno", 4));
  field_list.push_back(new Item_empty_string("Last_error", 20));
  field_list.push_back(new Item_empty_string("Skip_counter", 12));
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  field_list.push_back(new Item_empty_string("Last_log_seq", 12));
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  if(send_fields(thd, field_list, 1))
    DBUG_RETURN(-1);

  String* packet = &thd->packet;
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  uint32 last_log_seq;
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  packet->length(0);
  
  pthread_mutex_lock(&glob_mi.lock);
  net_store_data(packet, glob_mi.host);
  net_store_data(packet, glob_mi.user);
  net_store_data(packet, (uint32) glob_mi.port);
  net_store_data(packet, (uint32) glob_mi.connect_retry);
  net_store_data(packet, glob_mi.log_file_name);
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  net_store_data(packet, (longlong) glob_mi.pos);
  last_log_seq = glob_mi.last_log_seq;
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  pthread_mutex_unlock(&glob_mi.lock);
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  pthread_mutex_lock(&LOCK_slave);		// QQ; This is not needed
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  net_store_data(packet, slave_running ? "Yes":"No");
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  pthread_mutex_unlock(&LOCK_slave);		// QQ; This is not needed
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  net_store_data(packet, &replicate_do_db);
  net_store_data(packet, &replicate_ignore_db);
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  net_store_data(packet, (uint32)last_slave_errno);
  net_store_data(packet, last_slave_error);
  net_store_data(packet, slave_skip_counter);
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  net_store_data(packet, last_log_seq);
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  if (my_net_write(&thd->net, (char*)thd->packet.ptr(), packet->length()))
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    DBUG_RETURN(-1);

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

int flush_master_info(MASTER_INFO* mi)
{
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  IO_CACHE* file = &mi->file;
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  char lbuf[22];
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  char lbuf1[22];
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  my_b_seek(file, 0L);
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  my_b_printf(file, "%s\n%s\n%s\n%s\n%s\n%d\n%d\n%d\n",
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	      mi->log_file_name, llstr(mi->pos, lbuf), mi->host, mi->user,
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	      mi->password, mi->port, mi->connect_retry,
	      llstr(mi->last_log_seq, lbuf1));
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  flush_io_cache(file);
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  return 0;
}

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int st_master_info::wait_for_pos(THD* thd, String* log_name, ulonglong log_pos)
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{
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  if (!inited) return -1;
  bool pos_reached;
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  int event_count = 0;
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  pthread_mutex_lock(&lock);
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  while(!thd->killed)
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  {
    int cmp_result;
    if (*log_file_name)
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    {
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      /*
	We should use dirname_length() here when we have a version of
	this that doesn't modify the argument */
      char *basename = strrchr(log_file_name, FN_LIBCHAR);
      if (basename)
	++basename;
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      else
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	basename = log_file_name;
      cmp_result =  strncmp(basename, log_name->ptr(),
			    log_name->length());
    }
    else
      cmp_result = 0;
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    pos_reached = ((!cmp_result && pos >= log_pos) || cmp_result > 0);
    if (pos_reached || thd->killed)
      break;
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    const char* msg = thd->enter_cond(&cond, &lock,
				      "Waiting for master update");
    pthread_cond_wait(&cond, &lock);
    thd->exit_cond(msg);
    event_count++;
  }
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  pthread_mutex_unlock(&lock);
  return thd->killed ? -1 : event_count;
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}

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static int init_slave_thread(THD* thd)
{
  DBUG_ENTER("init_slave_thread");
  thd->system_thread = thd->bootstrap = 1;
  thd->client_capabilities = 0;
  my_net_init(&thd->net, 0);
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  thd->net.timeout = slave_net_timeout;
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  thd->max_packet_length=thd->net.max_packet;
  thd->master_access= ~0;
  thd->priv_user = 0;
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  thd->slave_thread = 1;
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  thd->options = (((opt_log_slave_updates) ? OPTION_BIN_LOG:0) | OPTION_AUTO_IS_NULL) ;
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  thd->system_thread = 1;
  thd->client_capabilities = CLIENT_LOCAL_FILES;
  slave_real_id=thd->real_id=pthread_self();
  pthread_mutex_lock(&LOCK_thread_count);
  thd->thread_id = thread_id++;
  pthread_mutex_unlock(&LOCK_thread_count);

  if (init_thr_lock() ||
      my_pthread_setspecific_ptr(THR_THD,  thd) ||
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      my_pthread_setspecific_ptr(THR_MALLOC, &thd->mem_root) ||
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      my_pthread_setspecific_ptr(THR_NET,  &thd->net))
  {
    close_connection(&thd->net,ER_OUT_OF_RESOURCES); // is this needed?
    end_thread(thd,0);
    DBUG_RETURN(-1);
  }

  thd->mysys_var=my_thread_var;
  thd->dbug_thread_id=my_thread_id();
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#if !defined(__WIN__) && !defined(OS2)
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  sigset_t set;
  VOID(sigemptyset(&set));			// Get mask in use
  VOID(pthread_sigmask(SIG_UNBLOCK,&set,&thd->block_signals));
#endif

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  thd->mem_root.free=thd->mem_root.used=0;	// Probably not needed
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  if (thd->max_join_size == (ulong) ~0L)
    thd->options |= OPTION_BIG_SELECTS;

  thd->proc_info="Waiting for master update";
  thd->version=refresh_version;
  thd->set_time();

  DBUG_RETURN(0);
}

static int safe_sleep(THD* thd, int sec)
{
  thr_alarm_t alarmed;
  thr_alarm_init(&alarmed);
  time_t start_time= time((time_t*) 0);
  time_t end_time= start_time+sec;
  ALARM  alarm_buff;

  while (start_time < end_time)
  {
    int nap_time = (int) (end_time - start_time);
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    /*
      the only reason we are asking for alarm is so that
      we will be woken up in case of murder, so if we do not get killed,
      set the alarm so it goes off after we wake up naturally
    */
    thr_alarm(&alarmed, 2 * nap_time,&alarm_buff);
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    sleep(nap_time);
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    // if we wake up before the alarm goes off, hit the button
    // so it will not wake up the wife and kids :-)
    if (thr_alarm_in_use(&alarmed))
      thr_end_alarm(&alarmed);
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    if (slave_killed(thd))
      return 1;
    start_time=time((time_t*) 0);
  }
  return 0;
}


static int request_dump(MYSQL* mysql, MASTER_INFO* mi)
{
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  char buf[FN_REFLEN + 10];
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  int len;
  int binlog_flags = 0; // for now
  char* logname = mi->log_file_name;
  int4store(buf, mi->pos);
  int2store(buf + 4, binlog_flags);
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  int4store(buf + 6, server_id);
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  len = (uint) strlen(logname);
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  memcpy(buf + 10, logname,len);
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  if (mc_simple_command(mysql, COM_BINLOG_DUMP, buf, len + 10, 1))
  {
    // something went wrong, so we will just reconnect and retry later
    // in the future, we should do a better error analysis, but for
    // now we just fill up the error log :-)
    sql_print_error("Error on COM_BINLOG_DUMP: %s, will retry in %d secs",
		    mc_mysql_error(mysql), master_connect_retry);
    return 1;
  }
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  return 0;
}

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static int request_table_dump(MYSQL* mysql, const char* db, const char* table)
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{
  char buf[1024];
  char * p = buf;
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  uint table_len = (uint) strlen(table);
  uint db_len = (uint) strlen(db);
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  if(table_len + db_len > sizeof(buf) - 2)
    {
      sql_print_error("request_table_dump: Buffer overrun");
      return 1;
    } 
  
  *p++ = db_len;
  memcpy(p, db, db_len);
  p += db_len;
  *p++ = table_len;
  memcpy(p, table, table_len);
  
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  if (mc_simple_command(mysql, COM_TABLE_DUMP, buf, p - buf + table_len, 1))
  {
    sql_print_error("request_table_dump: Error sending the table dump \
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command");
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    return 1;
  }
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  return 0;
}


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static ulong read_event(MYSQL* mysql, MASTER_INFO *mi)
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{
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  ulong len = packet_error;
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  // for convinience lets think we start by
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  // being in the interrupted state :-)
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  int read_errno = EINTR;

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  // my_real_read() will time us out
  // we check if we were told to die, and if not, try reading again
942
#ifndef DBUG_OFF
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943
  if (disconnect_slave_event_count && !(events_till_disconnect--))
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    return packet_error;      
#endif
  
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  while (!abort_loop && !abort_slave && len == packet_error &&
	 read_errno == EINTR )
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  {
    len = mc_net_safe_read(mysql);
    read_errno = errno;
  }
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953
  if (abort_loop || abort_slave)
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    return packet_error;
955
  if (len == packet_error || (long) len < 1)
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956
  {
957 958 959
    sql_print_error("Error reading packet from server: %s (read_errno %d,\
server_errno=%d)",
		    mc_mysql_error(mysql), read_errno, mc_mysql_errno(mysql));
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    return packet_error;
  }

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963 964
  if (len == 1)
  {
965 966
     sql_print_error("Slave: received 0 length packet from server, apparent\
 master shutdown: %s (%d)",
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		     mc_mysql_error(mysql), read_errno);
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     return packet_error;
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  }
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970 971
  
  DBUG_PRINT("info",( "len=%u, net->read_pos[4] = %d\n",
972
		      len, mysql->net.read_pos[4]));
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  return len - 1;   
}

976
int check_expected_error(THD* thd, int expected_error)
977 978 979 980 981 982 983 984 985 986 987 988 989 990
{
  switch(expected_error)
    {
    case ER_NET_READ_ERROR:
    case ER_NET_ERROR_ON_WRITE:  
    case ER_SERVER_SHUTDOWN:  
    case ER_NEW_ABORTING_CONNECTION:
      my_snprintf(last_slave_error, sizeof(last_slave_error), 
		 "Slave: query '%s' partially completed on the master \
and was aborted. There is a chance that your master is inconsistent at this \
point. If you are sure that your master is ok, run this query manually on the\
 slave and then restart the slave with SET SQL_SLAVE_SKIP_COUNTER=1;\
 SLAVE START;", thd->query);
      last_slave_errno = expected_error;
991
      sql_print_error("%s",last_slave_error);
992 993 994 995 996
      return 1;
    default:
      return 0;
    }
}
997

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998 999
static int exec_event(THD* thd, NET* net, MASTER_INFO* mi, int event_len)
{
1000
  const char *error_msg;
1001
  Log_event * ev = Log_event::read_log_event((const char*)net->read_pos + 1,
1002 1003
					     event_len, &error_msg,
					     mi->old_format);
1004 1005
  if (ev)
  {
1006
    int type_code = ev->get_type_code();
1007
    int exec_res;
1008
    if (ev->server_id == ::server_id ||
1009
	(slave_skip_counter && type_code != ROTATE_EVENT))
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1010
    {
1011
      if(type_code == LOAD_EVENT)
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	skip_load_data_infile(net);
1013
	
1014
      mi->inc_pos(event_len, ev->log_seq);
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      flush_master_info(mi);
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      if(slave_skip_counter && /* protect against common user error of
				  setting the counter to 1 instead of 2
			          while recovering from an failed
			          auto-increment insert */
	 	 !(type_code == INTVAR_EVENT &&
				 slave_skip_counter == 1))
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1022
        --slave_skip_counter;
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      delete ev;     
      return 0;					// avoid infinite update loops
    }
1026 1027
  
    thd->server_id = ev->server_id; // use the original server id for logging
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1028
    thd->set_time();				// time the query
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    if(!thd->log_seq)
      thd->log_seq = ev->log_seq;
    if (!ev->when)
1032
      ev->when = time(NULL);
1033 1034 1035 1036
    ev->thd = thd;
    exec_res = ev->exec_event(mi);
    delete ev;
    return exec_res;
1037
  }
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1038
  else
1039
  {
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    sql_print_error("\
Could not parse log event entry, check the master for binlog corruption\n\
This may also be a network problem, or just a bug in the master or slave code.\
");
1044 1045
    return 1;
  }
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}
      
// slave thread

pthread_handler_decl(handle_slave,arg __attribute__((unused)))
{
1052 1053 1054
#ifndef DBUG_OFF
 slave_begin:  
#endif  
1055
  THD *thd; // needs to be first for thread_stack
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1056
  MYSQL *mysql = NULL ;
1057
  char llbuff[22];
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1058

1059
  pthread_mutex_lock(&LOCK_slave);
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  if (!server_id)
  {
    pthread_cond_broadcast(&COND_slave_start);
    pthread_mutex_unlock(&LOCK_slave);
    sql_print_error("Server id not set, will not start slave");
    pthread_exit((void*)1);
  }
1067
  
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1068 1069
  if(slave_running)
    {
1070
      pthread_cond_broadcast(&COND_slave_start);
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      pthread_mutex_unlock(&LOCK_slave);
1072
      pthread_exit((void*)1);  // safety just in case
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1073 1074 1075
    }
  slave_running = 1;
  abort_slave = 0;
1076 1077 1078
#ifndef DBUG_OFF  
  events_till_abort = abort_slave_event_count;
#endif  
1079 1080
  pthread_cond_broadcast(&COND_slave_start);
  pthread_mutex_unlock(&LOCK_slave);
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1081
  
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1082
  // int error = 1;
1083
  bool retried_once = 0;
1084
  ulonglong last_failed_pos = 0;
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1085
  
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1086 1087
  // needs to call my_thread_init(), otherwise we get a coredump in DBUG_ stuff
  my_thread_init();
1088
  slave_thd = thd = new THD; // note that contructor of THD uses DBUG_ !
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  DBUG_ENTER("handle_slave");

  pthread_detach_this_thread();
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1092
  if (init_slave_thread(thd) || init_master_info(&glob_mi))
1093 1094 1095 1096
    {
      sql_print_error("Failed during slave thread initialization");
      goto err;
    }
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  thd->thread_stack = (char*)&thd; // remember where our stack is
1098
  thd->temporary_tables = save_temporary_tables; // restore temp tables
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  threads.append(thd);
1100 1101
  glob_mi.pending = 0;  //this should always be set to 0 when the slave thread
  // is started
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1102
  
1103 1104
  DBUG_PRINT("info",("master info: log_file_name=%s, position=%s",
		     glob_mi.log_file_name, llstr(glob_mi.pos,llbuff)));
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1105

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1106 1107 1108 1109 1110 1111
  
  if (!(mysql = mc_mysql_init(NULL)))
  {
    sql_print_error("Slave thread: error in mc_mysql_init()");
    goto err;
  }
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1112 1113
  
  thd->proc_info = "connecting to master";
1114 1115
#ifndef DBUG_OFF  
  sql_print_error("Slave thread initialized");
1116 1117
#endif
  // we can get killed during safe_connect
1118
  if (!safe_connect(thd, mysql, &glob_mi))
1119
   sql_print_error("Slave: connected to master '%s@%s:%d',\
1120 1121 1122 1123
  replication started in log '%s' at position %s", glob_mi.user,
		   glob_mi.host, glob_mi.port,
		   RPL_LOG_NAME,
		   llstr(glob_mi.pos,llbuff));
1124
  else
1125 1126 1127 1128
  {
    sql_print_error("Slave thread killed while connecting to master");
    goto err;
  }
1129

1130
connected:
1131

1132
  thd->slave_net = &mysql->net;
1133 1134 1135
  // register ourselves with the master
  // if fails, this is not fatal - we just print the error message and go
  // on with life
1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146
  thd->proc_info = "Checking master version";
  if (check_master_version(mysql, &glob_mi))
  {
    goto err;
  }
  if (!glob_mi.old_format)
  {
    thd->proc_info = "Registering slave on master";
    if (register_slave_on_master(mysql) ||  update_slave_list(mysql))
      goto err;
  }
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1147
  
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1148 1149
  while (!slave_killed(thd))
  {
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1150
      thd->proc_info = "Requesting binlog dump";
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1151 1152 1153 1154
      if(request_dump(mysql, &glob_mi))
	{
	  sql_print_error("Failed on request_dump()");
	  if(slave_killed(thd))
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1155
	    {
1156 1157 1158 1159
	      sql_print_error("Slave thread killed while requesting master \
dump");
              goto err;
	    }
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1160
	  
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1161
	  thd->proc_info = "Waiiting to reconnect after a failed dump request";
1162
	  if(mysql->net.vio)
1163 1164 1165 1166 1167 1168 1169 1170 1171
	    vio_close(mysql->net.vio);
	  // first time retry immediately, assuming that we can recover
	  // right away - if first time fails, sleep between re-tries
	  // hopefuly the admin can fix the problem sometime
	  if(retried_once)
	    safe_sleep(thd, glob_mi.connect_retry);
	  else
	    retried_once = 1;
	  
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1172
	  if(slave_killed(thd))
1173 1174 1175
	    {
	      sql_print_error("Slave thread killed while retrying master \
dump");
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1176
	      goto err;
1177
	    }
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1179
	  thd->proc_info = "Reconnecting after a failed dump request";
1180
	  last_failed_pos=glob_mi.pos;
1181
          sql_print_error("Slave: failed dump request, reconnecting to \
1182 1183
try again, log '%s' at postion %s", RPL_LOG_NAME,
			  llstr(last_failed_pos,llbuff));
1184
	  if(safe_reconnect(thd, mysql, &glob_mi) || slave_killed(thd))
1185 1186
	    {
	      sql_print_error("Slave thread killed during or after reconnect");
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1187
	      goto err;
1188
	    }
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1189

1190
	  goto connected;
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1191 1192 1193 1194 1195
	}


      while(!slave_killed(thd))
	{
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1196
	  thd->proc_info = "Reading master update";
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1197
	  ulong event_len = read_event(mysql, &glob_mi);
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1198
	  if(slave_killed(thd))
1199 1200 1201 1202
	    {
	      sql_print_error("Slave thread killed while reading event");
	      goto err;
	    }
1203 1204

	  	  
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1205 1206
	  if (event_len == packet_error)
	  {
1207 1208 1209 1210 1211 1212 1213 1214 1215
	    if(mc_mysql_errno(mysql) == ER_NET_PACKET_TOO_LARGE)
	      {
		sql_print_error("Log entry on master is longer than \
max_allowed_packet on slave. Slave thread will be aborted. If the entry is \
really supposed to be that long, restart the server with a higher value of \
max_allowed_packet. The current value is %ld", max_allowed_packet);
		goto err;
	      }
	    
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1216
	    thd->proc_info = "Waiting to reconnect after a failed read";
1217
	    if(mysql->net.vio)
1218 1219 1220 1221 1222 1223
 	      vio_close(mysql->net.vio);
	    if(retried_once) // punish repeat offender with sleep
	      safe_sleep(thd, glob_mi.connect_retry);
	    else
	      retried_once = 1; 
	    
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1224
	    if(slave_killed(thd))
1225 1226 1227 1228 1229
	      {
		sql_print_error("Slave thread killed while waiting to \
reconnect after a failed read");
	        goto err;
	      }
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1230
	    thd->proc_info = "Reconnecting after a failed read";
1231
	    last_failed_pos= glob_mi.pos;
1232
	    sql_print_error("Slave: Failed reading log event, \
1233 1234
reconnecting to retry, log '%s' position %s", RPL_LOG_NAME,
			    llstr(last_failed_pos, llbuff));
1235
	    if(safe_reconnect(thd, mysql, &glob_mi) || slave_killed(thd))
1236 1237 1238 1239 1240
	      {
		sql_print_error("Slave thread killed during or after a \
reconnect done to recover from failed read");
	        goto err;
	      }
1241 1242 1243
	    
	    goto connected;
	  } // if(event_len == packet_error)
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1244
	  
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1245
	  thd->proc_info = "Processing master log event"; 
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1246 1247
	  if(exec_event(thd, &mysql->net, &glob_mi, event_len))
	    {
1248 1249 1250
	      sql_print_error("\
Error running query, slave aborted. Fix the problem, and re-start \
the slave thread with \"mysqladmin start-slave\". We stopped at log \
1251 1252
'%s' position %s",
			      RPL_LOG_NAME, llstr(glob_mi.pos, llbuff));
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1253 1254
	      goto err;
	      // there was an error running the query
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1255 1256 1257
	      // abort the slave thread, when the problem is fixed, the user
	      // should restart the slave with mysqladmin start-slave
	    }
1258 1259 1260 1261 1262 1263 1264
#ifndef DBUG_OFF
	  if(abort_slave_event_count && !--events_till_abort)
	    {
	      sql_print_error("Slave: debugging abort");
	      goto err;
	    }
#endif	  
1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277
	  
	  // successful exec with offset advance,
	  // the slave repents and his sins are forgiven!
	  if(glob_mi.pos > last_failed_pos)
	    {
	     retried_once = 0;
#ifndef DBUG_OFF
	     stuck_count = 0;
#endif
	    }
#ifndef DBUG_OFF
	  else
	    {
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1278 1279
	      // show a little mercy, allow slave to read one more event
	      // before cutting him off - otherwise he gets stuck
1280
	      // on Intvar events, since they do not advance the offset
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1281 1282
	      // immediately
	      if (++stuck_count > 2)
1283 1284 1285
	        events_till_disconnect++;
	    }
#endif	  
1286 1287
	} // while(!slave_killed(thd)) - read/exec loop
  } // while(!slave_killed(thd)) - slave loop
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1288

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1289
  // error = 0;
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1290
 err:
1291 1292
  // print the current replication position 
  sql_print_error("Slave thread exiting, replication stopped in log '%s' at \
1293 1294
position %s",
		  RPL_LOG_NAME, llstr(glob_mi.pos,llbuff));
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1295 1296
  thd->query = thd->db = 0; // extra safety
  if(mysql)
1297
      mc_mysql_close(mysql);
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1298
  thd->proc_info = "Waiting for slave mutex on exit";
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1299 1300
  pthread_mutex_lock(&LOCK_slave);
  slave_running = 0;
1301
  change_rpl_status(RPL_ACTIVE_SLAVE,RPL_IDLE_SLAVE);
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1302
  abort_slave = 0;
1303 1304
  save_temporary_tables = thd->temporary_tables;
  thd->temporary_tables = 0; // remove tempation from destructor to close them
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1305 1306
  pthread_cond_broadcast(&COND_slave_stopped); // tell the world we are done
  pthread_mutex_unlock(&LOCK_slave);
1307
  net_end(&thd->net); // destructor will not free it, because we are weird
1308
  slave_thd = 0;
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1309 1310
  delete thd;
  my_thread_end();
1311 1312 1313 1314
#ifndef DBUG_OFF
  if(abort_slave_event_count && !events_till_abort)
    goto slave_begin;
#endif  
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1315 1316 1317 1318
  pthread_exit(0);
  DBUG_RETURN(0);				// Can't return anything here
}

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1319 1320 1321

/* try to connect until successful or slave killed */

1322
static int safe_connect(THD* thd, MYSQL* mysql, MASTER_INFO* mi)
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1323
{
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1324
  return connect_to_master(thd, mysql, mi, 0);
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1325 1326
}

1327 1328 1329 1330
/*
  Try to connect until successful or slave killed or we have retried
  master_retry_count times
*/
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1331

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1332 1333
static int connect_to_master(THD* thd, MYSQL* mysql, MASTER_INFO* mi,
			     bool reconnect)
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1334
{
1335
  int slave_was_killed;
1336 1337
  int last_errno= -2;				// impossible error
  ulong err_count=0;
1338 1339
  char llbuff[22];

1340 1341 1342 1343
  /*
    If we lost connection after reading a state set event
    we will be re-reading it, so pending needs to be cleared
  */
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1344
  mi->pending = 0;
1345 1346 1347
#ifndef DBUG_OFF
  events_till_disconnect = disconnect_slave_event_count;
#endif
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1348 1349 1350 1351
  while (!(slave_was_killed = slave_killed(thd)) &&
	 (reconnect ? mc_mysql_reconnect(mysql) :
	  !mc_mysql_connect(mysql, mi->host, mi->user, mi->password, 0,
			  mi->port, 0, 0)))
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1352
  {
1353 1354 1355
    /* Don't repeat last error */
    if (mc_mysql_errno(mysql) != last_errno)
    {
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1356
      sql_print_error("Slave thread: error connecting to master: \
1357
%s, last_errno=%d, retry in %d sec",
1358 1359 1360
		      mc_mysql_error(mysql), last_errno=mc_mysql_errno(mysql),
		      mi->connect_retry);
    }
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1361
    safe_sleep(thd, mi->connect_retry);
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    /* by default we try forever. The reason is that failure will trigger
       master election, so if the user did not set master_retry_count we
       do not want to have electioin triggered on the first failure to
       connect
    */
    if (master_retry_count && err_count++ == master_retry_count)
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    {
      slave_was_killed=1;
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      if (reconnect)
        change_rpl_status(RPL_ACTIVE_SLAVE,RPL_LOST_SOLDIER);
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      break;
    }
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  }
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  if (!slave_was_killed)
  {
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    if (reconnect)
      sql_print_error("Slave: connected to master '%s@%s:%d',\
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replication resumed in log '%s' at position %s", glob_mi.user,
		    glob_mi.host, glob_mi.port,
		    RPL_LOG_NAME,
		    llstr(glob_mi.pos,llbuff));
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    else
    {
      change_rpl_status(RPL_IDLE_SLAVE,RPL_ACTIVE_SLAVE);
      mysql_log.write(thd, COM_CONNECT_OUT, "%s@%s:%d",
		  mi->user, mi->host, mi->port);
    }
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#ifdef SIGNAL_WITH_VIO_CLOSE
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    thd->set_active_vio(mysql->net.vio);
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#endif      
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  }
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  return slave_was_killed;
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}

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/*
  Try to connect until successful or slave killed or we have retried
  master_retry_count times
*/

static int safe_reconnect(THD* thd, MYSQL* mysql, MASTER_INFO* mi)
{
  return connect_to_master(thd, mysql, mi, 1);
}


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#ifdef __GNUC__
template class I_List_iterator<i_string>;
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template class I_List_iterator<i_string_pair>;
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#endif