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Addition of CHANGE MASTER TO

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Addition of CHANGE MASTER TO … command.

Current handled command has four options, example:

change master to MASTER_LOG_FILE='mysql-bin.000049',
MASTER_LOG_POS=245, MASTER_HOST='127.0.0.1', MASTER_PORT=3307;
This commit is contained in:
MassimilianoPinto
2015-05-29 17:01:34 +02:00
parent f54fcc7e4e
commit 392c71df07
1 changed files with 174 additions and 2 deletions
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176
server/modules/routing/binlog/blr_slave.c
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@ -36,7 +36,9 @@
* 18/02/2015 Massimiliano Pinto Addition of DISCONNECT ALL and DISCONNECT SERVER server_id
* 18/03/2015 Markus Makela Better detection of CRC32 | NONE checksum
* 19/03/2015 Massimiliano Pinto Addition of basic MariaDB 10 compatibility support
* 25/05/2015 Massimiliano Pinto Addition BLRM_SLAVE_STOPPED state and blr_start/stop_slave
* 25/05/2015 Massimiliano Pinto Addition of BLRM_SLAVE_STOPPED state and blr_start/stop_slave.
* New commands STOP SLAVE, START SLAVE added.
* 29/05/2015 Massimiliano Pinto Addition of CHANGE MASTER TO ...
*
* @endverbatim
*/
@ -88,6 +90,9 @@ static int blr_slave_send_ok(ROUTER_INSTANCE* router, ROUTER_SLAVE* slave);
static int blr_stop_slave(ROUTER_INSTANCE* router, ROUTER_SLAVE* slave);
static int blr_start_slave(ROUTER_INSTANCE* router, ROUTER_SLAVE* slave);
static void blr_slave_send_error_packet(ROUTER_SLAVE *slave, char *msg, unsigned int err_num, char *status);
static char *get_change_master_option(char *input, char *option);
static void blr_handle_change_master(ROUTER_INSTANCE* router, char *command);
extern int lm_enabled_logfiles_bitmask;
extern size_t log_ses_count[];
@ -431,7 +436,7 @@ int query_len;
}
}
/* stop replication from the current */
/* stop replication from the current master*/
else if (strcasecmp(query_text, "STOP") == 0)
{
if ((word = strtok_r(NULL, sep, &brkb)) == NULL)
@ -445,6 +450,37 @@ int query_len;
return blr_stop_slave(router, slave);
}
}
/* Change the server to replicate from */
else if (strcasecmp(query_text, "CHANGE") == 0)
{
if ((word = strtok_r(NULL, sep, &brkb)) == NULL)
{
LOGIF(LE, (skygw_log_write(LOGFILE_ERROR, "%s: Incomplete CHANGE command.",
router->service->name)));
}
else if (strcasecmp(word, "MASTER") == 0)
{
char *master_host=NULL;
char *master_port = NULL;
char *master_logfile = NULL;
char *master_log_pos = NULL;
if (router->master_state != BLRM_SLAVE_STOPPED)
{
free(query_text);
blr_slave_send_error_packet(slave, "Cannot change master with a running slave; run STOP SLAVE first", (unsigned int)1198, NULL);
return 1;
}
else
{
blr_handle_change_master(router, brkb);
free(query_text);
return blr_slave_send_ok(router, slave);
}
}
}
else if (strcasecmp(query_text, "DISCONNECT") == 0)
{
if ((word = strtok_r(NULL, sep, &brkb)) == NULL)
@ -2288,3 +2324,139 @@ uint8_t mysql_err[2];
slave->dcb->func.write(slave->dcb, pkt);
}
/**
* Get a 'change master to' option
*
* @param input The current command
* @param option_field The option to fetch
*/
static
char *get_change_master_option(char *input, char *option_field) {
extern char *strcasestr();
char *option = NULL;
char *ptr = NULL;
ptr = strcasestr(input, option_field);
if (ptr) {
char *end;
option = strdup(ptr);
end = strchr(option, ',');
if (end)
*end = '\0';
}
return option;
}
/**
* handle a 'change master' operation
*
* @param router The router instance
* @param command The change master SQL command
*/
static
void blr_handle_change_master(ROUTER_INSTANCE* router, char *command) {
char *master_host=NULL;
char *master_port = NULL;
char *master_logfile = NULL;
char *master_log_pos = NULL;
/* fetch options from SQL command */
master_host = get_change_master_option(command, "MASTER_HOST");
master_port = get_change_master_option(command, "MASTER_PORT");
master_logfile = get_change_master_option(command, "MASTER_LOG_FILE");
master_log_pos = get_change_master_option(command, "MASTER_LOG_POS");
LOGIF(LM, (skygw_log_write(LOGFILE_MESSAGE, "%s: CHANGE MASTER: MASTER_HOST=[%s], MASTER_PORT=[%s], MASTER_LOG_FILE=[%s], MASTER_LOG_POS=[%s]",
router->service->name,
master_host != NULL ? (master_host + 12) : "null",
master_port != NULL ? (master_port + 12) : "null",
master_logfile != NULL ? (master_logfile + 16) : "null",
master_log_pos != NULL ? (master_log_pos + 15) : "null")));
/*
* Change values in the router->service->dbref->server structure
* Change binlogfilename and position in the router scrutcure
*/
spinlock_acquire(&router->lock);
/* Change the master name/address */
if (master_host) {
char *ptr;
char *end;
ptr = strchr(master_host, '\'');
if (ptr)
ptr++;
else
ptr = master_host + 12;
end = strchr(ptr, '\'');
if (end)
*end ='\0';
if (router->service->dbref->server->name) {
free(router->service->dbref->server->name);
}
router->service->dbref->server->name = strdup(ptr);
LOGIF(LT, (skygw_log_write(LOGFILE_TRACE, "%s: New MASTER_HOST is [%s]",
router->service->name,
router->service->dbref->server->name)));
free(master_host);
}
/* Change the master port */
if (master_port) {
router->service->dbref->server->port = atoi(master_port + 12);
LOGIF(LT, (skygw_log_write(LOGFILE_TRACE, "%s: New MASTER_PORT is [%i]",
router->service->name,
router->service->dbref->server->port)));
free(master_port);
}
/* Change the binlog filename to request from master */
if (master_logfile) {
char *ptr;
char *end;
ptr = strchr(master_logfile, '\'');
if (ptr)
ptr++;
else
ptr = master_logfile + 16;
end = strchr(ptr+1, '\'');
if (end)
*end ='\0';
memset(router->binlog_name, '\0', sizeof(router->binlog_name));
strncpy(router->binlog_name, ptr, BINLOG_FNAMELEN);
LOGIF(LT, (skygw_log_write(LOGFILE_TRACE, "%s: New MASTER_LOG_FILE is [%s]",
router->service->name,
router->binlog_name)));
free(master_logfile);
}
/* Change the position in the current binlog filename */
if (master_log_pos) {
long pos = atol(master_log_pos + 15);
if (pos <= 0) {
LOGIF(LE, (skygw_log_write(LOGFILE_ERROR, "%s: cannot set MASTER_LOG_POS to [%u] for binlog [%s]. Set to 4",
router->service->name,
pos,
router->binlog_name)));
router->binlog_position = 4;
} else {
router->binlog_position = atol(master_log_pos + 15);
}
LOGIF(LT, (skygw_log_write(LOGFILE_TRACE, "%s: New MASTER_LOG_POS is [%u]",
router->service->name,
router->binlog_position)));
free(master_log_pos);
}
spinlock_release(&router->lock);
}