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/* Copyright (C) 2000 MySQL AB & MySQL Finland AB & TCX DataKonsult AB & Sasha
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
#include "mysql_priv.h"
#include "repl_failsafe.h"
#include "sql_repl.h"
#include "slave.h"
#include "mini_client.h"
#include <mysql.h>
RPL_STATUS rpl_status=RPL_NULL;
pthread_mutex_t LOCK_rpl_status;
pthread_cond_t COND_rpl_status;
const char *rpl_role_type[] = {"MASTER","SLAVE",NullS};
TYPELIB rpl_role_typelib = {array_elements(rpl_role_type)-1,"",
rpl_role_type};
const char* rpl_status_type[] = {"AUTH_MASTER","ACTIVE_SLAVE","IDLE_SLAVE",
"LOST_SOLDIER","TROOP_SOLDIER",
"RECOVERY_CAPTAIN","NULL",NullS};
TYPELIB rpl_status_typelib= {array_elements(rpl_status_type)-1,"",
rpl_status_type};
static int init_failsafe_rpl_thread(THD* thd)
{
DBUG_ENTER("init_failsafe_rpl_thread");
thd->system_thread = thd->bootstrap = 1;
thd->client_capabilities = 0;
my_net_init(&thd->net, 0);
thd->net.timeout = slave_net_timeout;
thd->max_packet_length=thd->net.max_packet;
thd->master_access= ~0;
thd->priv_user = 0;
thd->system_thread = 1;
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) ||
my_pthread_setspecific_ptr(THR_MALLOC, &thd->mem_root) ||
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();
#if !defined(__WIN__) && !defined(OS2)
sigset_t set;
VOID(sigemptyset(&set)); // Get mask in use
VOID(pthread_sigmask(SIG_UNBLOCK,&set,&thd->block_signals));
#endif
thd->mem_root.free=thd->mem_root.used=0;
if (thd->max_join_size == (ulong) ~0L)
thd->options |= OPTION_BIG_SELECTS;
thd->proc_info="Thread initialized";
thd->version=refresh_version;
thd->set_time();
DBUG_RETURN(0);
}
void change_rpl_status(RPL_STATUS from_status, RPL_STATUS to_status)
{
pthread_mutex_lock(&LOCK_rpl_status);
if (rpl_status == from_status || rpl_status == RPL_ANY)
rpl_status = to_status;
pthread_cond_signal(&COND_rpl_status);
pthread_mutex_unlock(&LOCK_rpl_status);
}
int update_slave_list(MYSQL* mysql)
{
MYSQL_RES* res=0;
MYSQL_ROW row;
const char* error=0;
bool have_auth_info;
int port_ind;
if (mc_mysql_query(mysql,"SHOW SLAVE HOSTS",0) ||
!(res = mc_mysql_store_result(mysql)))
{
error = "Query error";
goto err;
}
switch (mc_mysql_num_fields(res))
{
case 5:
have_auth_info = 0;
port_ind=2;
break;
case 7:
have_auth_info = 1;
port_ind=4;
break;
default:
error = "Invalid number of fields in SHOW SLAVE HOSTS";
goto err;
}
pthread_mutex_lock(&LOCK_slave_list);
while ((row = mc_mysql_fetch_row(res)))
{
uint32 server_id;
SLAVE_INFO* si, *old_si;
server_id = atoi(row[0]);
if ((old_si = (SLAVE_INFO*)hash_search(&slave_list,
(byte*)&server_id,4)))
si = old_si;
else
{
if (!(si = (SLAVE_INFO*)my_malloc(sizeof(SLAVE_INFO), MYF(MY_WME))))
{
error = "Out of memory";
pthread_mutex_unlock(&LOCK_slave_list);
goto err;
}
si->server_id = server_id;
}
strnmov(si->host, row[1], sizeof(si->host));
si->port = atoi(row[port_ind]);
si->rpl_recovery_rank = atoi(row[port_ind+1]);
si->master_id = atoi(row[port_ind+2]);
if (have_auth_info)
{
strnmov(si->user, row[2], sizeof(si->user));
strnmov(si->password, row[3], sizeof(si->password));
}
}
pthread_mutex_unlock(&LOCK_slave_list);
err:
if (res)
mc_mysql_free_result(res);
if (error)
{
sql_print_error("Error updating slave list:",error);
return 1;
}
return 0;
}
int find_recovery_captain(THD* thd, MYSQL* mysql)
{
return 0;
}
pthread_handler_decl(handle_failsafe_rpl,arg)
{
DBUG_ENTER("handle_failsafe_rpl");
THD *thd = new THD;
thd->thread_stack = (char*)&thd;
MYSQL* recovery_captain = 0;
pthread_detach_this_thread();
if (init_failsafe_rpl_thread(thd) || !(recovery_captain=mc_mysql_init(0)))
{
sql_print_error("Could not initialize failsafe replication thread");
goto err;
}
pthread_mutex_lock(&LOCK_rpl_status);
while (!thd->killed && !abort_loop)
{
bool break_req_chain = 0;
const char* msg = thd->enter_cond(&COND_rpl_status,
&LOCK_rpl_status, "Waiting for request");
pthread_cond_wait(&COND_rpl_status, &LOCK_rpl_status);
thd->proc_info="Processling request";
while (!break_req_chain)
{
switch (rpl_status)
{
case RPL_LOST_SOLDIER:
if (find_recovery_captain(thd, recovery_captain))
rpl_status=RPL_TROOP_SOLDIER;
else
rpl_status=RPL_RECOVERY_CAPTAIN;
break_req_chain=1; /* for now until other states are implemented */
break;
default:
break_req_chain=1;
break;
}
}
thd->exit_cond(msg);
}
pthread_mutex_unlock(&LOCK_rpl_status);
err:
if (recovery_captain)
mc_mysql_close(recovery_captain);
delete thd;
my_thread_end();
pthread_exit(0);
DBUG_RETURN(0);
}
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