6e1a69df7e
This reduces the amount of guesswork the monitor has to do when executing the script and places that burden on the called script.
448 lines
10 KiB
C
448 lines
10 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 monitor.c - The monitor module management routines
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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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* 23/05/14 Massimiliano Pinto Addition of monitor_interval parameter
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* and monitor id
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* 30/10/14 Massimiliano Pinto Addition of disable_master_failback parameter
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* 07/11/14 Massimiliano Pinto Addition of monitor network timeouts
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* 08/05/15 Markus Makela Moved common monitor variables to MONITOR struct
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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 <spinlock.h>
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#include <modules.h>
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#include <skygw_utils.h>
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#include <log_manager.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 MONITOR *allMonitors = NULL;
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static SPINLOCK monLock = SPINLOCK_INIT;
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/**
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* Allocate a new monitor, load the associated module for the monitor
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* and start execution on the monitor.
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*
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* @param name The name of the monitor module to load
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* @param module The module to load
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* @return The newly created monitor
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*/
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MONITOR *
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monitor_alloc(char *name, char *module)
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{
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MONITOR *mon;
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if ((mon = (MONITOR *)malloc(sizeof(MONITOR))) == NULL)
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{
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return NULL;
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}
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mon->state = MONITOR_STATE_ALLOC;
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mon->name = strdup(name);
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if ((mon->module = load_module(module, MODULE_MONITOR)) == 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 : Unable to load monitor module '%s'.",
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name)));
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free(mon->name);
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free(mon);
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return NULL;
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}
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mon->handle = NULL;
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mon->databases = NULL;
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mon->name = NULL;
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mon->password = NULL;
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mon->read_timeout = DEFAULT_READ_TIMEOUT;
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mon->write_timeout = DEFAULT_WRITE_TIMEOUT;
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mon->connect_timeout = DEFAULT_CONNECT_TIMEOUT;
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spinlock_init(&mon->lock);
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spinlock_acquire(&monLock);
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mon->next = allMonitors;
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allMonitors = mon;
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spinlock_release(&monLock);
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return mon;
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}
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/**
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* Free a monitor, first stop the monitor and then remove the monitor from
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* the chain of monitors and free the memory.
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*
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* @param mon The monitor to free
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*/
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void
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monitor_free(MONITOR *mon)
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{
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MONITOR *ptr;
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mon->module->stopMonitor(mon);
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mon->state = MONITOR_STATE_FREED;
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spinlock_acquire(&monLock);
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if (allMonitors == mon)
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allMonitors = mon->next;
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else
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{
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ptr = allMonitors;
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while (ptr->next && ptr->next != mon)
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ptr = ptr->next;
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if (ptr->next)
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ptr->next = mon->next;
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}
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spinlock_release(&monLock);
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free(mon->name);
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free(mon);
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}
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/**
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* Start an individual monitor that has previoulsy been stopped.
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*
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* @param monitor The Monitor that should be started
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*/
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void
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monitorStart(MONITOR *monitor, void* params)
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{
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monitor->handle = (*monitor->module->startMonitor)(monitor,params);
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monitor->state = MONITOR_STATE_RUNNING;
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}
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/**
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* Stop a given monitor
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*
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* @param monitor The monitor to stop
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*/
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void
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monitorStop(MONITOR *monitor)
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{
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if(monitor->state != MONITOR_STATE_STOPPED)
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{
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monitor->state = MONITOR_STATE_STOPPING;
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monitor->module->stopMonitor(monitor);
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monitor->state = MONITOR_STATE_STOPPED;
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}
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}
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/**
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* Shutdown all running monitors
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*/
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void
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monitorStopAll()
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{
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MONITOR *ptr;
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spinlock_acquire(&monLock);
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ptr = allMonitors;
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while (ptr)
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{
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monitorStop(ptr);
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ptr = ptr->next;
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}
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spinlock_release(&monLock);
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}
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/**
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* Add a server to a monitor. Simply register the server that needs to be
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* monitored to the running monitor module.
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*
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* @param mon The Monitor instance
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* @param server The Server to add to the monitoring
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*/
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void
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monitorAddServer(MONITOR *mon, SERVER *server)
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{
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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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db->mon_err_count = 0;
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/** Server status is uninitialized */
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db->mon_prev_status = -1;
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/* pending status is updated by get_replication_tree */
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db->pending_status = 0;
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spinlock_acquire(&mon->lock);
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if (mon->databases == NULL)
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mon->databases = db;
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else
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{
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ptr = mon->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(&mon->lock);
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}
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/**
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* Add a default user to the monitor. This user is used to connect to the
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* monitored databases but may be overriden on a per server basis.
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*
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* @param mon The monitor instance
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* @param user The default username to use when connecting
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* @param passwd The default password associated to the default user.
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*/
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void
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monitorAddUser(MONITOR *mon, char *user, char *passwd)
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{
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mon->user = strdup(user);
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mon->password = strdup(passwd);
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}
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/**
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* Show all monitors
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*
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* @param dcb DCB for printing output
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*/
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void
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monitorShowAll(DCB *dcb)
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{
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MONITOR *ptr;
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spinlock_acquire(&monLock);
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ptr = allMonitors;
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while (ptr)
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{
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dcb_printf(dcb, "Monitor: %p\n", ptr);
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dcb_printf(dcb, "\tName: %s\n", ptr->name);
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if (ptr->module->diagnostics)
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ptr->module->diagnostics(dcb, ptr);
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ptr = ptr->next;
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}
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spinlock_release(&monLock);
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}
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/**
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* Show a single monitor
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*
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* @param dcb DCB for printing output
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*/
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void
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monitorShow(DCB *dcb, MONITOR *monitor)
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{
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dcb_printf(dcb, "Monitor: %p\n", monitor);
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dcb_printf(dcb, "\tName: %s\n", monitor->name);
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if (monitor->module->diagnostics)
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monitor->module->diagnostics(dcb, monitor);
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}
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/**
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* List all the monitors
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*
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* @param dcb DCB for printing output
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*/
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void
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monitorList(DCB *dcb)
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{
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MONITOR *ptr;
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spinlock_acquire(&monLock);
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ptr = allMonitors;
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dcb_printf(dcb, "---------------------+---------------------\n");
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dcb_printf(dcb, "%-20s | Status\n", "Monitor");
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dcb_printf(dcb, "---------------------+---------------------\n");
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while (ptr)
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{
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dcb_printf(dcb, "%-20s | %s\n", ptr->name,
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ptr->state & MONITOR_STATE_RUNNING
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? "Running" : "Stopped");
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ptr = ptr->next;
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}
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dcb_printf(dcb, "---------------------+---------------------\n");
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spinlock_release(&monLock);
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}
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/**
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* Find a monitor by name
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*
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* @param name The name of the monitor
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* @return Pointer to the monitor or NULL
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*/
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MONITOR *
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monitor_find(char *name)
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{
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MONITOR *ptr;
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spinlock_acquire(&monLock);
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ptr = allMonitors;
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while (ptr)
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{
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if (!strcmp(ptr->name, name))
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break;
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ptr = ptr->next;
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}
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spinlock_release(&monLock);
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return ptr;
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}
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/**
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* Set the monitor sampling interval.
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*
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* @param mon The monitor instance
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* @param interval The sampling interval in milliseconds
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*/
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void
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monitorSetInterval (MONITOR *mon, unsigned long interval)
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{
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mon->interval = interval;
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}
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/**
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* Set Monitor timeouts for connect/read/write
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*
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* @param mon The monitor instance
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* @param type The timeout handling type
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* @param value The timeout to set
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*/
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void
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monitorSetNetworkTimeout(MONITOR *mon, int type, int value) {
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int max_timeout = (int)(mon->interval/1000);
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int new_timeout = max_timeout -1;
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if (new_timeout <= 0)
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new_timeout = DEFAULT_CONNECT_TIMEOUT;
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switch(type) {
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case MONITOR_CONNECT_TIMEOUT:
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if (value < max_timeout) {
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memcpy(&mon->connect_timeout, &value, sizeof(int));
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} else {
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memcpy(&mon->connect_timeout, &new_timeout, sizeof(int));
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LOGIF(LE, (skygw_log_write_flush(
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LOGFILE_ERROR,
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"warning : Monitor Connect Timeout %i is greater than monitor interval ~%i seconds"
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", lowering to %i seconds", value, max_timeout, new_timeout)));
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}
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break;
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case MONITOR_READ_TIMEOUT:
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if (value < max_timeout) {
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memcpy(&mon->read_timeout, &value, sizeof(int));
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} else {
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memcpy(&mon->read_timeout, &new_timeout, sizeof(int));
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LOGIF(LE, (skygw_log_write_flush(
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LOGFILE_ERROR,
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"warning : Monitor Read Timeout %i is greater than monitor interval ~%i seconds"
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", lowering to %i seconds", value, max_timeout, new_timeout)));
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}
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break;
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case MONITOR_WRITE_TIMEOUT:
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if (value < max_timeout) {
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memcpy(&mon->write_timeout, &value, sizeof(int));
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} else {
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memcpy(&mon->write_timeout, &new_timeout, sizeof(int));
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LOGIF(LE, (skygw_log_write_flush(
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LOGFILE_ERROR,
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"warning : Monitor Write Timeout %i is greater than monitor interval ~%i seconds"
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", lowering to %i seconds", value, max_timeout, new_timeout)));
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}
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break;
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default:
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LOGIF(LE, (skygw_log_write_flush(
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LOGFILE_ERROR,
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"Error : Monitor setNetworkTimeout received an unsupported action type %i", type)));
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break;
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}
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}
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/**
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* Provide a row to the result set that defines the set of monitors
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*
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* @param set The result set
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* @param data The index of the row to send
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* @return The next row or NULL
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*/
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static RESULT_ROW *
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monitorRowCallback(RESULTSET *set, void *data)
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{
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int *rowno = (int *)data;
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int i = 0;;
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char buf[20];
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RESULT_ROW *row;
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MONITOR *ptr;
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spinlock_acquire(&monLock);
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ptr = allMonitors;
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while (i < *rowno && ptr)
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{
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i++;
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ptr = ptr->next;
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}
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if (ptr == NULL)
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{
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spinlock_release(&monLock);
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free(data);
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return NULL;
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}
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(*rowno)++;
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row = resultset_make_row(set);
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resultset_row_set(row, 0, ptr->name);
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resultset_row_set(row, 1, ptr->state & MONITOR_STATE_RUNNING
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? "Running" : "Stopped");
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spinlock_release(&monLock);
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return row;
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}
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/**
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* Return a resultset that has the current set of monitors in it
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*
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* @return A Result set
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*/
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RESULTSET *
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monitorGetList()
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{
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RESULTSET *set;
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int *data;
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if ((data = (int *)malloc(sizeof(int))) == NULL)
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return NULL;
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*data = 0;
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if ((set = resultset_create(monitorRowCallback, data)) == NULL)
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{
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free(data);
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return NULL;
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}
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resultset_add_column(set, "Monitor", 20, COL_TYPE_VARCHAR);
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resultset_add_column(set, "Status", 10, COL_TYPE_VARCHAR);
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return set;
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}
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