02e60e215b
Addition of code for dynamic reconfiguration by editign the cnf file and sendign a SIGHUP Improvements to the make install rule
309 lines
6.9 KiB
C
309 lines
6.9 KiB
C
/*
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* This file is distributed as part of the SkySQL Gateway. It is free
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* software: you can redistribute it and/or modify it under the terms of the
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* GNU General Public License as published by the Free Software Foundation,
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* version 2.
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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* FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
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* details.
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*
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* You should have received a copy of the GNU General Public License along with
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* this program; if not, write to the Free Software Foundation, Inc., 51
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* Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Copyright SkySQL Ab 2013
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*/
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/**
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* @file mysql_mon.c - A MySQL replication cluster monitor
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*
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* @verbatim
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* Revision History
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*
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* Date Who Description
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* 08/07/13 Mark Riddoch Initial implementation
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* 11/07/13 Mark Riddoch Addition of code to check replication
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* status
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*
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* @endverbatim
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <monitor.h>
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#include <mysqlmon.h>
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#include <thread.h>
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#include <mysql.h>
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#include <mysqld_error.h>
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#include <skygw_utils.h>
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#include <log_manager.h>
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static void monitorMain(void *);
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static char *version_str = "V1.0.0";
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static void *startMonitor();
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static void stopMonitor(void *);
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static void registerServer(void *, SERVER *);
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static void unregisterServer(void *, SERVER *);
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static MONITOR_OBJECT MyObject = { startMonitor, stopMonitor, registerServer, unregisterServer };
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/**
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* Implementation of the mandatory version entry point
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*
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* @return version string of the module
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*/
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char *
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version()
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{
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return version_str;
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}
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/**
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* The module initialisation routine, called when the module
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* is first loaded.
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*/
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void
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ModuleInit()
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{
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fprintf(stderr, "Initialise the MySQL Monitor module.\n");
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}
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/**
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* The module entry point routine. It is this routine that
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* must populate the structure that is referred to as the
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* "module object", this is a structure with the set of
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* external entry points for this module.
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*
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* @return The module object
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*/
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MONITOR_OBJECT *
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GetModuleObject()
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{
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return &MyObject;
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}
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/**
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* Start the instance of the monitor, returning a handle on the monitor.
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*
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* This function creates a thread to execute the actual monitoring.
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*
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* @return A handle to use when interacting with the monitor
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*/
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static void *
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startMonitor()
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{
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MYSQL_MONITOR *handle;
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if ((handle = (MYSQL_MONITOR *)malloc(sizeof(MYSQL_MONITOR))) == NULL)
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return NULL;
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handle->databases = NULL;
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handle->shutdown = 0;
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spinlock_init(&handle->lock);
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thread_start(monitorMain, handle);
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return handle;
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}
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/**
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* Stop a running monitor
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*
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* @param arg Handle on thr running monior
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*/
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static void
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stopMonitor(void *arg)
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{
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MYSQL_MONITOR *handle = (MYSQL_MONITOR *)arg;
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handle->shutdown = 1;
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}
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/**
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* Register a server that must be added to the monitored servers for
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* a monitoring module.
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*
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* @param arg A handle on the running monitor module
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* @param server The server to add
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*/
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static void
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registerServer(void *arg, SERVER *server)
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{
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MYSQL_MONITOR *handle = (MYSQL_MONITOR *)arg;
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MONITOR_SERVERS *ptr, *db;
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if ((db = (MONITOR_SERVERS *)malloc(sizeof(MONITOR_SERVERS))) == NULL)
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return;
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db->server = server;
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db->con = NULL;
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db->next = NULL;
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spinlock_acquire(&handle->lock);
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if (handle->databases == NULL)
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handle->databases = db;
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else
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{
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ptr = handle->databases;
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while (ptr->next != NULL)
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ptr = ptr->next;
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ptr->next = db;
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}
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spinlock_release(&handle->lock);
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}
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/**
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* Remove a server from those being monitored by a monitoring module
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*
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* @param arg A handle on the running monitor module
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* @param server The server to remove
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*/
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static void
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unregisterServer(void *arg, SERVER *server)
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{
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MYSQL_MONITOR *handle = (MYSQL_MONITOR *)arg;
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MONITOR_SERVERS *ptr, *lptr;
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spinlock_acquire(&handle->lock);
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if (handle->databases == NULL)
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{
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spinlock_release(&handle->lock);
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return;
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}
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if (handle->databases->server == server)
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{
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ptr = handle->databases;
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handle->databases = handle->databases->next;
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free(ptr);
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}
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else
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{
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ptr = handle->databases;
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while (ptr->next != NULL && ptr->next->server != server)
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ptr = ptr->next;
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if (ptr->next)
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{
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lptr = ptr->next;
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ptr->next = ptr->next->next;
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free(lptr);
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}
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}
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spinlock_release(&handle->lock);
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}
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/**
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* Monitor an individual server
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*
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* @param database The database to probe
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*/
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static void
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monitorDatabase(MONITOR_SERVERS *database)
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{
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MYSQL_ROW row;
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MYSQL_RES *result;
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int num_fields;
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int ismaster = 0, isslave = 0;
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if (database->con == NULL || mysql_ping(database->con) != 0)
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{
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database->con = mysql_init(NULL);
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if (mysql_real_connect(database->con, database->server->name,
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database->server->monuser, database->server->monpw,
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NULL, database->server->port, NULL, 0) == NULL)
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{
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server_clear_status(database->server, SERVER_RUNNING);
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return;
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}
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}
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/* If we get this far then we have a working connection */
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server_set_status(database->server, SERVER_RUNNING);
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/* Check SHOW SLAVE HOSTS - if we get rows then we are a master */
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if (mysql_query(database->con, "SHOW SLAVE HOSTS"))
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{
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if (mysql_errno(database->con) == ER_SPECIFIC_ACCESS_DENIED_ERROR)
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{
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/* Log lack of permission */
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}
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}
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else if ((result = mysql_store_result(database->con)) != NULL)
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{
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num_fields = mysql_num_fields(result);
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while ((row = mysql_fetch_row(result)))
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{
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ismaster = 1;
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}
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mysql_free_result(result);
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}
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/* Check if the Slave_SQL_Running and Slave_IO_Running status is
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* set to Yes
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*/
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if (mysql_query(database->con, "SHOW SLAVE STATUS") == 0
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&& (result = mysql_store_result(database->con)) != NULL)
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{
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num_fields = mysql_num_fields(result);
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while ((row = mysql_fetch_row(result)))
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{
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if (strncmp(row[10], "Yes", 3) == 0
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&& strncmp(row[11], "Yes", 3) == 0)
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isslave = 1;
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}
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mysql_free_result(result);
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}
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if (ismaster)
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{
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server_set_status(database->server, SERVER_MASTER);
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server_clear_status(database->server, SERVER_SLAVE);
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}
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else if (isslave)
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{
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server_set_status(database->server, SERVER_SLAVE);
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server_clear_status(database->server, SERVER_MASTER);
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}
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if (ismaster == 0 && isslave == 0)
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{
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server_clear_status(database->server, SERVER_SLAVE);
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server_clear_status(database->server, SERVER_MASTER);
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}
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}
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/**
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* The entry point for the monitoring module thread
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*
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* @param arg The handle of the monitor
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*/
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static void
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monitorMain(void *arg)
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{
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MYSQL_MONITOR *handle = (MYSQL_MONITOR *)arg;
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MONITOR_SERVERS *ptr;
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if (mysql_thread_init())
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{
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skygw_log_write_flush(NULL,
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LOGFILE_ERROR,
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"Fatal : mysql_init_thread failed in monitor "
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"module. Exiting.\n");
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return;
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}
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while (1)
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{
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if (handle->shutdown)
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{
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mysql_thread_end();
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return;
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}
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ptr = handle->databases;
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while (ptr)
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{
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monitorDatabase(ptr);
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ptr = ptr->next;
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}
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thread_millisleep(10000);
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}
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}
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