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/* Copyright (C) 2004 MySQL 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 */
#ifdef __GNUC__
#pragma implementation
#endif
#include "instance.h"
#include "mysql_manager_error.h"
#include "log.h"
#include "instance_map.h"
#include <my_sys.h>
#include <signal.h>
#include <m_string.h>
#include <sys/wait.h>
/*
The method starts an instance.
SYNOPSYS
start()
RETURN
0 ok
ER_CANNOT_START_INSTANCE Cannot start instance
ER_INSTANCE_ALREADY_STARTED The instance on the specified port/socket
is already started
*/
int Instance::start()
{
/* echk for the pidfile and remove it */
if (!is_running())
{
stop();
log_info("starting instance %s", options.instance_name);
switch (pid= fork()) {
case 0:
execv(options.mysqld_path, options.argv);
exit(1);
case -1:
return ER_CANNOT_START_INSTANCE;
default:
return 0;
}
}
/* the instance is started already */
return ER_INSTANCE_ALREADY_STARTED;
}
int Instance::cleanup()
{
return 0;
}
Instance::~Instance()
{
pthread_mutex_destroy(&LOCK_instance);
}
bool Instance::is_running()
{
MYSQL mysql;
uint port= 0;
const char *socket= NULL;
const char *password= "321rarepassword213";
const char *username= "645rareusername945";
const char *access_denied_message= "Access denied for user";
bool return_val;
if (options.mysqld_port)
port= atoi(strchr(options.mysqld_port, '=') + 1);
if (options.mysqld_socket)
socket= strchr(options.mysqld_socket, '=') + 1;
pthread_mutex_lock(&LOCK_instance);
mysql_init(&mysql);
/* try to connect to a server with the fake username/password pair */
if (mysql_real_connect(&mysql, LOCAL_HOST, username,
password,
NullS, port,
socket, 0))
{
/*
Very strange. We have successfully connected to the server using
bullshit as username/password. Write a warning to the logfile.
*/
log_info("The Instance Manager was able to log into you server \
with faked compiled-in password while checking server status. \
Looks like something is wrong.");
mysql_close(&mysql);
pthread_mutex_unlock(&LOCK_instance);
return_val= TRUE; /* server is alive */
}
else
{
if (!strncmp(access_denied_message, mysql_error(&mysql),
sizeof(access_denied_message)-1))
{
return_val= TRUE;
}
else
return_val= FALSE;
}
mysql_close(&mysql);
pthread_mutex_unlock(&LOCK_instance);
return return_val;
}
/*
Stop an instance.
SYNOPSYS
stop()
RETURN:
0 ok
ER_INSTANCE_IS_NOT_STARTED Looks like the instance it is not started
ER_STOP_INSTANCE mysql_shutdown reported an error
*/
int Instance::stop()
{
pid_t pid;
struct timespec timeout;
time_t waitchild= 35; /* */
if ((pid= options.get_pid()) != 0) /* get pid from pidfile */
{
/*
If we cannot kill mysqld, then it has propably crashed.
Let us try to remove staled pidfile and return succes as mysqld
is stopped
*/
if (kill(pid, SIGTERM))
{
if (options.unlink_pidfile())
log_error("cannot remove pidfile for instance %i, this might be \
since IM lacks permmissions or hasn't found the pidifle",
options.instance_name);
log_error("The instance %s has probably crashed or IM lacks permissions \
to kill it. in either case something seems to be wrong. \
Check your setup", options.instance_name);
return 0;
}
/* sleep on condition to wait for SIGCHLD */
timeout.tv_sec= time(NULL) + waitchild;
timeout.tv_nsec= 0;
if (pthread_mutex_lock(&instance_map->pid_cond.LOCK_pid))
goto err; /* perhaps this should be procecced differently */
while (options.get_pid() != 0)
{
int status;
status= pthread_cond_timedwait(&instance_map->pid_cond.COND_pid,
&instance_map->pid_cond.LOCK_pid,
&timeout);
if (status == ETIMEDOUT)
break;
}
pthread_mutex_unlock(&instance_map->pid_cond.LOCK_pid);
if (!kill(pid, SIGKILL))
{
log_error("The instance %s has been stopped forsibly. Normally \
it should not happed. Probably the instance has been \
hanging. You should also check your IM setup",
options.instance_name);
}
return 0;
}
return ER_INSTANCE_IS_NOT_STARTED;
err:
return ER_STOP_INSTANCE;
}
/*
We execute this function to initialize instance parameters.
Return value: 0 - ok. 1 - unable to init DYNAMIC_ARRAY.
*/
int Instance::init(const char *name_arg)
{
pthread_mutex_init(&LOCK_instance, 0);
return options.init(name_arg);
}
int Instance::complete_initialization(Instance_map *instance_map_arg)
{
instance_map= instance_map_arg;
return 0;
}
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