MXS-1209: blr_slave_query cleanup
Added blr_handle_admin_stmt()
This commit is contained in:
MassimilianoPinto
@ -7254,3 +7254,358 @@ static bool blr_handle_set_stmt(ROUTER_INSTANCE *router,
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return false;
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return false;
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}
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}
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/**
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* Handle received admin statements from clients
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*
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* if an admin statement is one of suported one
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* a proper reply to the connected client is done
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*
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* @param router Router instance
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* @param slave Connected client/slave server
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* @param admin_stmt The admin statement
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* @param admin_opts The admin command options
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* @return True for handled queries, False otherwise
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*/
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static bool blr_handle_admin_stmt(ROUTER_INSTANCE *router,
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ROUTER_SLAVE *slave,
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char *admin_stmt,
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char *admin_opts)
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{
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char *word;
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char *brkb;
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char *sep = " \t,=";
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if (admin_opts == NULL || !admin_opts[0])
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{
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MXS_ERROR("%s: Incomplete admin command.", router->service->name);
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return false;
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}
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/* Handle RESET command */
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else if (strcasecmp(admin_stmt, "RESET") == 0)
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{
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if ((word = strtok_r(admin_opts, sep, &brkb)) == NULL)
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{
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MXS_ERROR("%s: Incomplete RESET command.", router->service->name);
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return false;
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}
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/* RESET the current configured master cfg */
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else if (strcasecmp(word, "SLAVE") == 0)
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{
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if (router->master_state == BLRM_SLAVE_STOPPED)
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{
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char error_string[BINLOG_ERROR_MSG_LEN + 1] = "";
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MASTER_SERVER_CFG *current_master = NULL;
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int removed_cfg = 0;
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/* save current replication parameters */
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current_master = (MASTER_SERVER_CFG *)MXS_CALLOC(1, sizeof(MASTER_SERVER_CFG));
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MXS_ABORT_IF_NULL(current_master);
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if (!current_master)
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{
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snprintf(error_string,
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BINLOG_ERROR_MSG_LEN,
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"error allocating memory for blr_master_get_config");
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MXS_ERROR("%s: %s", router->service->name, error_string);
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blr_slave_send_error_packet(slave,
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error_string,
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(unsigned int)1201,
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NULL);
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return true;
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}
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/* get current data */
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blr_master_get_config(router, current_master);
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MXS_NOTICE("%s: 'RESET SLAVE executed'. Previous state MASTER_HOST='%s', "
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"MASTER_PORT=%i, MASTER_LOG_FILE='%s', MASTER_LOG_POS=%lu, "
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"MASTER_USER='%s'",
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router->service->name,
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current_master->host,
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current_master->port,
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current_master->logfile,
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current_master->pos,
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current_master->user);
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/* remove master.ini */
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static const char MASTER_INI[] = "/master.ini";
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char path[strlen(router->binlogdir) + sizeof(MASTER_INI)];
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strcpy(path, router->binlogdir);
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strcat(path, MASTER_INI);
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/* remove master.ini */
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removed_cfg = unlink(path);
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if (removed_cfg == -1)
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{
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snprintf(error_string, BINLOG_ERROR_MSG_LEN,
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"Error removing %s, %s, errno %u", path,
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mxs_strerror(errno), errno);
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MXS_ERROR("%s: %s", router->service->name, error_string);
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}
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spinlock_acquire(&router->lock);
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/* Set the BLRM_UNCONFIGURED state */
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router->master_state = BLRM_UNCONFIGURED;
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blr_master_set_empty_config(router);
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blr_master_free_config(current_master);
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/* Remove any error message and errno */
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free(router->m_errmsg);
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router->m_errmsg = NULL;
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router->m_errno = 0;
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spinlock_release(&router->lock);
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if (removed_cfg == -1)
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{
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blr_slave_send_error_packet(slave,
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error_string,
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(unsigned int)1201,
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NULL);
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}
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else
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{
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blr_slave_send_ok(router, slave);
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}
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return true;
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}
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else
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{
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if (router->master_state == BLRM_UNCONFIGURED)
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{
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blr_slave_send_ok(router, slave);
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}
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else
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{
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blr_slave_send_error_packet(slave,
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"This operation cannot be performed "
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"with a running slave; run STOP SLAVE first",
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(unsigned int)1198, NULL);
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}
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return true;
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}
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}
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}
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/* Start replication from the current configured master */
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else if (strcasecmp(admin_stmt, "START") == 0)
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{
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if ((word = strtok_r(admin_opts, sep, &brkb)) == NULL)
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{
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MXS_ERROR("%s: Incomplete START command.",
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router->service->name);
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return false;
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}
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else if (strcasecmp(word, "SLAVE") == 0)
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{
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blr_start_slave(router, slave);
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return true;
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}
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}
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/* Stop replication from the current master*/
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else if (strcasecmp(admin_stmt, "STOP") == 0)
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{
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if ((word = strtok_r(admin_opts, sep, &brkb)) == NULL)
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{
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MXS_ERROR("%s: Incomplete STOP command.", router->service->name);
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return false;
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}
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else if (strcasecmp(word, "SLAVE") == 0)
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{
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blr_stop_slave(router, slave);
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return true;
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}
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}
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/* Change the server to replicate from */
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else if (strcasecmp(admin_stmt, "CHANGE") == 0)
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{
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if ((word = strtok_r(admin_opts, sep, &brkb)) == NULL)
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{
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MXS_ERROR("%s: Incomplete CHANGE command.", router->service->name);
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return false;
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}
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else if (strcasecmp(word, "MASTER") == 0)
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{
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if (router->master_state != BLRM_SLAVE_STOPPED &&
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router->master_state != BLRM_UNCONFIGURED)
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{
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blr_slave_send_error_packet(slave,
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"Cannot change master with a running slave; "
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"run STOP SLAVE first",
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(unsigned int)1198, NULL);
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return true;
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}
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else
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{
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int rc;
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char error_string[BINLOG_ERROR_MSG_LEN + 1] = "";
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MASTER_SERVER_CFG *current_master = NULL;
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current_master = (MASTER_SERVER_CFG *)MXS_CALLOC(1, sizeof(MASTER_SERVER_CFG));
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if (!current_master)
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{
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blr_slave_send_error_packet(slave,
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error_string,
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(unsigned int)1201,
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NULL);
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return true;
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}
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blr_master_get_config(router, current_master);
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rc = blr_handle_change_master(router, brkb, error_string);
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if (rc < 0)
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{
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/* CHANGE MASTER TO has failed */
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blr_slave_send_error_packet(slave,
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error_string,
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(unsigned int)1234,
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"42000");
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blr_master_free_config(current_master);
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return true;
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}
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else
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{
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int ret;
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char error[BINLOG_ERROR_MSG_LEN + 1];
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/* Write/Update master config into master.ini file */
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ret = blr_file_write_master_config(router, error);
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if (ret)
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{
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/* file operation failure: restore config */
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spinlock_acquire(&router->lock);
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blr_master_apply_config(router, current_master);
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blr_master_free_config(current_master);
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spinlock_release(&router->lock);
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snprintf(error_string, BINLOG_ERROR_MSG_LEN,
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"Error writing into %s/master.ini: %s",
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router->binlogdir,
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error);
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MXS_ERROR("%s: %s",
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router->service->name, error_string);
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blr_slave_send_error_packet(slave,
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error_string,
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(unsigned int)1201,
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NULL);
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return true;
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}
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/**
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* check if router is BLRM_UNCONFIGURED
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* and change state to BLRM_SLAVE_STOPPED
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*/
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if (rc == 1 || router->master_state == BLRM_UNCONFIGURED)
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{
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spinlock_acquire(&router->lock);
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router->master_state = BLRM_SLAVE_STOPPED;
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spinlock_release(&router->lock);
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/*
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* The binlog server has just been configured
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* master.ini file written in router->binlogdir.
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* Now create the binlogfile specified in MASTER_LOG_FILE
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*/
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if (blr_file_new_binlog(router, router->binlog_name))
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{
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MXS_INFO("%s: 'master.ini' created, binlog file '%s' created",
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router->service->name, router->binlog_name);
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}
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blr_master_free_config(current_master);
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blr_slave_send_ok(router, slave);
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return true;
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}
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if (router->trx_safe &&
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router->pending_transaction.state > BLRM_NO_TRANSACTION)
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{
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if (strcmp(router->binlog_name, router->prevbinlog) != 0)
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{
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char message[BINLOG_ERROR_MSG_LEN + 1] = "";
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snprintf(message, BINLOG_ERROR_MSG_LEN,
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"1105:Partial transaction in file %s starting at pos %lu, "
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"ending at pos %lu will be lost with next START SLAVE command",
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current_master->logfile,
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current_master->safe_pos,
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current_master->pos);
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blr_master_free_config(current_master);
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blr_slave_send_warning_message(router, slave, message);
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return true;
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}
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}
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blr_master_free_config(current_master);
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/*
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* The CHAMGE MASTER command might specify a new binlog file.
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* Let's create the binlogfile specified in MASTER_LOG_FILE
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*/
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if (strlen(router->prevbinlog) &&
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strcmp(router->prevbinlog, router->binlog_name))
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{
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if (blr_file_new_binlog(router, router->binlog_name))
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{
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MXS_INFO("%s: created new binlog file '%s' by "
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"'CHANGE MASTER TO' command",
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router->service->name,
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router->binlog_name);
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}
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}
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blr_slave_send_ok(router, slave);
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return true;
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}
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}
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}
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}
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/* Discnnect conneted client(s) */
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else if (strcasecmp(admin_stmt, "DISCONNECT") == 0)
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{
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if ((word = strtok_r(admin_opts, sep, &brkb)) == NULL)
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{
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MXS_ERROR("%s: Incomplete DISCONNECT command.",
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router->service->name);
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return false;
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}
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else if (strcasecmp(word, "ALL") == 0)
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{
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blr_slave_disconnect_all(router, slave);
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return true;
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}
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else if (strcasecmp(word, "SERVER") == 0)
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{
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if ((word = strtok_r(NULL, sep, &brkb)) == NULL)
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{
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MXS_ERROR("%s: Expected DISCONNECT SERVER $server_id",
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router->service->name);
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return false;
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}
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else
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{
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int serverid = atoi(word);
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blr_slave_disconnect_server(router, slave, serverid);
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return true;
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}
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}
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}
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return false;
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}
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Reference in New Issue
Block a user