510 lines
13 KiB
C
510 lines
13 KiB
C
/*
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* This file is distributed as part of the MariaDB Corporation MaxScale. 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 MariaDB Corporation Ab 2013-2014
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*/
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/**
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* @file ndbcluster_mon.c - A MySQL cluster SQL node 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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* 25/07/14 Massimiliano Pinto Initial implementation
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* 10/11/14 Massimiliano Pinto Added setNetworkTimeout for connect,read,write
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* 08/05/15 Markus Makela Addition of launchable scripts
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*
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* @endverbatim
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*/
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#include <mysqlmon.h>
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/** Defined in log_manager.cc */
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extern int lm_enabled_logfiles_bitmask;
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extern size_t log_ses_count[];
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extern __thread log_info_t tls_log_info;
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static void monitorMain(void *);
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static char *version_str = "V2.1.0";
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MODULE_INFO info = {
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MODULE_API_MONITOR,
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MODULE_BETA_RELEASE,
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MONITOR_VERSION,
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"A MySQL cluster SQL node monitor"
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};
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static void *startMonitor(void *,void*);
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static void stopMonitor(void *);
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static void diagnostics(DCB *, void *);
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bool isNdbEvent(monitor_event_t event);
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static MONITOR_OBJECT MyObject = {
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startMonitor,
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stopMonitor,
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diagnostics
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};
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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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LOGIF(LM, (skygw_log_write(
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LOGFILE_MESSAGE,
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"Initialise the MySQL Cluster Monitor module %s.\n",
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version_str)));
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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(void *arg,void* opt)
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{
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MONITOR* mon = (MONITOR*)arg;
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MYSQL_MONITOR *handle = mon->handle;
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CONFIG_PARAMETER* params = (CONFIG_PARAMETER*)opt;
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bool have_events = false,script_error = false;
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if (handle != NULL)
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{
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handle->shutdown = 0;
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}
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else
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{
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if ((handle = (MYSQL_MONITOR *)malloc(sizeof(MYSQL_MONITOR))) == NULL)
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return NULL;
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handle->shutdown = 0;
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handle->id = MONITOR_DEFAULT_ID;
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handle->script = NULL;
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handle->master = NULL;
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memset(handle->events,false,sizeof(handle->events));
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spinlock_init(&handle->lock);
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}
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while(params)
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{
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if(!strcmp(params->name,"script"))
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{
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if(handle->script)
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free(handle->script);
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if(access(params->value,X_OK) == 0)
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{
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handle->script = strdup(params->value);
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}
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else
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{
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script_error = true;
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if(access(params->value,F_OK) == 0)
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{
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skygw_log_write(LE,
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"Error: The file cannot be executed: %s",
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params->value);
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}
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else
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{
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skygw_log_write(LE,
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"Error: The file cannot be found: %s",
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params->value);
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}
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handle->script = NULL;
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}
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}
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else if(!strcmp(params->name,"events"))
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{
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if(mon_parse_event_string((bool*)&handle->events,sizeof(handle->events),params->value) != 0)
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script_error = true;
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else
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have_events = true;
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}
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params = params->next;
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}
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if(script_error)
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{
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skygw_log_write(LE,"Error: Errors were found in the script configuration parameters "
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"for the monitor '%s'. The script will not be used.",mon->name);
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free(handle->script);
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handle->script = NULL;
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}
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/** If no specific events are given, enable them all */
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if(!have_events)
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{
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memset(handle->events,true,sizeof(handle->events));
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}
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handle->tid = (THREAD)thread_start(monitorMain, mon);
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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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MONITOR* mon = (MONITOR*)arg;
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MYSQL_MONITOR *handle = (MYSQL_MONITOR *)mon->handle;
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handle->shutdown = 1;
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thread_wait((void *)handle->tid);
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}
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/**
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* Diagnostic interface
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*
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* @param dcb DCB to send output
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* @param arg The monitor handle
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*/
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static void
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diagnostics(DCB *dcb, void *arg)
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{
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MONITOR* mon = arg;
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MYSQL_MONITOR *handle = (MYSQL_MONITOR *)mon->handle;
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MONITOR_SERVERS *db;
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char *sep;
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switch (handle->status)
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{
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case MONITOR_RUNNING:
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dcb_printf(dcb, "\tMonitor running\n");
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break;
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case MONITOR_STOPPING:
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dcb_printf(dcb, "\tMonitor stopping\n");
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break;
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case MONITOR_STOPPED:
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dcb_printf(dcb, "\tMonitor stopped\n");
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break;
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}
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dcb_printf(dcb,"\tSampling interval:\t%lu milliseconds\n", mon->interval);
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dcb_printf(dcb,"\tConnect Timeout:\t%i seconds\n", mon->connect_timeout);
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dcb_printf(dcb,"\tRead Timeout:\t\t%i seconds\n", mon->read_timeout);
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dcb_printf(dcb,"\tWrite Timeout:\t\t%i seconds\n", mon->write_timeout);
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dcb_printf(dcb, "\tMonitored servers: ");
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db = mon->databases;
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sep = "";
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while (db)
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{
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dcb_printf(dcb, "%s%s:%d", sep, db->server->name, db->server->port);
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sep = ", ";
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db = db->next;
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}
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dcb_printf(dcb, "\n");
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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, char *defaultUser, char *defaultPasswd, MONITOR *mon)
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{
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MYSQL_MONITOR* handle = mon->handle;
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MYSQL_ROW row;
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MYSQL_RES *result;
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int isjoined = 0;
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char *uname = defaultUser, *passwd = defaultPasswd;
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char *server_string;
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if (database->server->monuser != NULL)
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{
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uname = database->server->monuser;
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passwd = database->server->monpw;
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}
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if (uname == NULL)
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return;
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/* Don't even probe server flagged as in maintenance */
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if (SERVER_IN_MAINT(database->server))
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return;
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if (database->con == NULL || mysql_ping(database->con) != 0)
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{
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char *dpwd = decryptPassword(passwd);
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int connect_timeout = mon->connect_timeout;
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int read_timeout = mon->read_timeout;
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int write_timeout = mon->write_timeout;
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if(database->con)
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mysql_close(database->con);
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database->con = mysql_init(NULL);
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mysql_options(database->con, MYSQL_OPT_CONNECT_TIMEOUT, (void *)&connect_timeout);
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mysql_options(database->con, MYSQL_OPT_READ_TIMEOUT, (void *)&read_timeout);
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mysql_options(database->con, MYSQL_OPT_WRITE_TIMEOUT, (void *)&write_timeout);
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if (mysql_real_connect(database->con, database->server->name,
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uname, dpwd, NULL, database->server->port, NULL, 0) == NULL)
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{
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LOGIF(LE, (skygw_log_write_flush(
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LOGFILE_ERROR,
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"Error : Monitor was unable to connect to "
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"server %s:%d : \"%s\"",
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database->server->name,
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database->server->port,
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mysql_error(database->con))));
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server_clear_status(database->server, SERVER_RUNNING);
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if (mysql_errno(database->con) == ER_ACCESS_DENIED_ERROR)
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{
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server_set_status(database->server, SERVER_AUTH_ERROR);
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}
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database->server->node_id = -1;
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free(dpwd);
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return;
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}
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else
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{
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server_clear_status(database->server, SERVER_AUTH_ERROR);
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}
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free(dpwd);
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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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/* get server version string */
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server_string = (char *)mysql_get_server_info(database->con);
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if (server_string) {
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database->server->server_string = realloc(database->server->server_string, strlen(server_string)+1);
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if (database->server->server_string)
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strcpy(database->server->server_string, server_string);
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}
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/* Check if the the SQL node is able to contact one or more data nodes */
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if (mysql_query(database->con, "SHOW STATUS LIKE 'Ndb_number_of_ready_data_nodes'") == 0
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&& (result = mysql_store_result(database->con)) != NULL)
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{
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if(mysql_field_count(database->con) < 2)
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{
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mysql_free_result(result);
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skygw_log_write(LE,"Error: Unexpected result for \"SHOW STATUS LIKE 'Ndb_number_of_ready_data_nodes'\". Expected 2 columns."
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" MySQL Version: %s",version_str);
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return;
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}
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while ((row = mysql_fetch_row(result)))
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{
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if (atoi(row[1]) > 0)
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isjoined = 1;
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}
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mysql_free_result(result);
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}
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/* Check the the SQL node id in the MySQL cluster */
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if (mysql_query(database->con, "SHOW STATUS LIKE 'Ndb_cluster_node_id'") == 0
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&& (result = mysql_store_result(database->con)) != NULL)
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{
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if(mysql_field_count(database->con) < 2)
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{
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mysql_free_result(result);
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skygw_log_write(LE,"Error: Unexpected result for \"SHOW STATUS LIKE 'Ndb_cluster_node_id'\". Expected 2 columns."
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" MySQL Version: %s",version_str);
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return;
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}
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long cluster_node_id = -1;
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while ((row = mysql_fetch_row(result)))
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{
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cluster_node_id = strtol(row[1], NULL, 10);
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if ((errno == ERANGE && (cluster_node_id == LONG_MAX
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|| cluster_node_id == LONG_MIN)) || (errno != 0 && cluster_node_id == 0))
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{
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cluster_node_id = -1;
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}
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database->server->node_id = cluster_node_id;
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}
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mysql_free_result(result);
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}
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if (isjoined) {
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server_set_status(database->server, SERVER_NDB);
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database->server->depth = 0;
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} else {
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server_clear_status(database->server, SERVER_NDB);
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database->server->depth = -1;
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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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MONITOR* mon = arg;
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MYSQL_MONITOR *handle;
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MONITOR_SERVERS *ptr;
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size_t nrounds = 0;
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spinlock_acquire(&mon->lock);
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handle = (MYSQL_MONITOR *)mon->handle;
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spinlock_release(&mon->lock);
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if (mysql_thread_init())
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{
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LOGIF(LE, (skygw_log_write_flush(
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LOGFILE_ERROR,
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"Fatal : mysql_thread_init failed in monitor "
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"module. Exiting.\n")));
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return;
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}
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handle->status = MONITOR_RUNNING;
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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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handle->status = MONITOR_STOPPING;
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mysql_thread_end();
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handle->status = MONITOR_STOPPED;
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return;
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}
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/** Wait base interval */
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thread_millisleep(MON_BASE_INTERVAL_MS);
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/**
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* Calculate how far away the monitor interval is from its full
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* cycle and if monitor interval time further than the base
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* interval, then skip monitoring checks. Excluding the first
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* round.
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*/
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if (nrounds != 0 &&
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((nrounds*MON_BASE_INTERVAL_MS)%mon->interval) >=
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MON_BASE_INTERVAL_MS)
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{
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nrounds += 1;
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continue;
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}
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nrounds += 1;
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ptr = mon->databases;
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while (ptr)
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{
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ptr->mon_prev_status = ptr->server->status;
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monitorDatabase(ptr, mon->user, mon->password,mon);
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if (ptr->server->status != ptr->mon_prev_status ||
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SERVER_IS_DOWN(ptr->server))
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{
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LOGIF(LD, (skygw_log_write_flush(
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LOGFILE_DEBUG,
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"Backend server %s:%d state : %s",
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ptr->server->name,
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ptr->server->port,
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STRSRVSTATUS(ptr->server))));
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}
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ptr = ptr->next;
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}
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ptr = mon->databases;
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monitor_event_t evtype;
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while(ptr)
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{
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/** Execute monitor script if a server state has changed */
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if(mon_status_changed(ptr))
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{
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evtype = mon_get_event_type(ptr);
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if(isNdbEvent(evtype))
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{
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skygw_log_write(LOGFILE_TRACE,"Server changed state: %s[%s:%u]: %s",
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ptr->server->unique_name,
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ptr->server->name,ptr->server->port,
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mon_get_event_name(ptr));
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if(handle->script && handle->events[evtype])
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{
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monitor_launch_script(mon,ptr,handle->script);
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}
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}
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}
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ptr = ptr->next;
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}
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}
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}
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static monitor_event_t ndb_events[] = {
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MASTER_DOWN_EVENT,
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MASTER_UP_EVENT,
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SLAVE_DOWN_EVENT,
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SLAVE_UP_EVENT,
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SERVER_DOWN_EVENT,
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SERVER_UP_EVENT,
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NDB_UP_EVENT,
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NDB_DOWN_EVENT,
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LOST_MASTER_EVENT,
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LOST_SLAVE_EVENT,
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LOST_NDB_EVENT,
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NEW_MASTER_EVENT,
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NEW_SLAVE_EVENT,
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NEW_NDB_EVENT,
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MAX_MONITOR_EVENT
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};
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/**
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* Check if the event type is one the ndbcustermonitor is interested in.
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* @param event Event to check
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* @return True if the event is monitored, false if it is not
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*/
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bool isNdbEvent(monitor_event_t event)
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{
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int i;
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for(i = 0;ndb_events[i] != MAX_MONITOR_EVENT;i++)
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{
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if(event == ndb_events[i])
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return true;
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}
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return false;
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} |