7ef8b187b5
The hangup code was refactored into a common function which should only be used after the server states have been updated. This will remove erroneus connections to already failed servers.
235 lines
8.2 KiB
C
235 lines
8.2 KiB
C
#ifndef _MONITOR_H
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#define _MONITOR_H
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/*
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* Copyright (c) 2016 MariaDB Corporation Ab
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*
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* Use of this software is governed by the Business Source License included
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* in the LICENSE.TXT file and at www.mariadb.com/bsl.
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*
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* Change Date: 2019-01-01
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*
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* On the date above, in accordance with the Business Source License, use
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* of this software will be governed by version 2 or later of the General
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* Public License.
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*/
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#include <mysql.h>
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#include <server.h>
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#include <dcb.h>
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#include <log_manager.h>
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#include <resultset.h>
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#include <maxconfig.h>
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#include <externcmd.h>
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#include <secrets.h>
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/**
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* @file monitor.h The interface to the monitor module
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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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* 07/07/13 Mark Riddoch Initial implementation
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* 25/07/13 Mark Riddoch Addition of diagnotics
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* 23/05/14 Mark Riddoch Addition of routine to find monitors by name
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* 23/05/14 Massimiliano Pinto Addition of defaultId and setInterval
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* 23/06/14 Massimiliano Pinto Addition of replicationHeartbeat
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* 28/08/14 Massimiliano Pinto Addition of detectStaleMaster
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* 30/10/14 Massimiliano Pinto Addition of disableMasterFailback
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* 07/11/14 Massimiliano Pinto Addition of setNetworkTimeout
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* 19/02/15 Mark Riddoch Addition of monitorGetList
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* 19/11/15 Martin Brampton Automation of event and name declaration, absorption
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* of what was formerly monitor_common.h
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*
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* @endverbatim
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*/
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/**
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* The "Module Object" for a monitor module.
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*
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* The monitor modules are designed to monitor the backend databases that the gateway
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* connects to and provide information regarding the status of the databases that
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* is used in the routing decisions.
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*
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* startMonitor is called to start the monitoring process, it is called on the main
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* thread of the gateway and is responsible for creating a thread for the monitor
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* itself to run on. This should use the entry points defined in the thread.h
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* header file rather than make direct calls to the operating system thrading libraries.
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* The return from startMonitor is a void * handle that will be passed to all other monitor
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* API calls.
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*
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* stopMonitor is responsible for shuting down and destroying a monitor, it is called
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* with the void * handle that was returned by startMonitor.
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*
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* registerServer is called to register a server that must be monitored with a running
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* monitor. this will be called with the handle returned from the startMonitor call and
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* the SERVER structure that the monitor must update and monitor. The SERVER structure
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* contains the information required to connect to the monitored server.
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*
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* unregisterServer is called to remove a server from the set of servers that need to be
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* monitored.
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*/
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typedef struct
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{
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void *(*startMonitor)(void *, void*);
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void (*stopMonitor)(void *);
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void (*diagnostics)(DCB *, void *);
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} MONITOR_OBJECT;
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/**
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* The monitor API version number. Any change to the monitor module API
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* must change these versions usign the rules defined in modinfo.h
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*/
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#define MONITOR_VERSION {3, 0, 0}
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/** Monitor's poll frequency */
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#define MON_BASE_INTERVAL_MS 100
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/**
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* Monitor state bit mask values
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*/
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typedef enum
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{
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MONITOR_STATE_ALLOC = 0x00,
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MONITOR_STATE_RUNNING = 0x01,
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MONITOR_STATE_STOPPING = 0x02,
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MONITOR_STATE_STOPPED = 0x04,
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MONITOR_STATE_FREED = 0x08
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} monitor_state_t;
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/**
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* Monitor network timeout types
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*/
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typedef enum
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{
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MONITOR_CONNECT_TIMEOUT = 0,
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MONITOR_READ_TIMEOUT = 1,
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MONITOR_WRITE_TIMEOUT = 2
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} monitor_timeouts_t;
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/*
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* Results of attempt at database connection for monitoring
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*/
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typedef enum
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{
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MONITOR_CONN_OK,
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MONITOR_CONN_REFUSED,
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MONITOR_CONN_TIMEOUT
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} connect_result_t;
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#define MON_ARG_MAX 8192
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#define DEFAULT_CONNECT_TIMEOUT 3
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#define DEFAULT_READ_TIMEOUT 1
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#define DEFAULT_WRITE_TIMEOUT 2
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#define MONITOR_RUNNING 1
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#define MONITOR_STOPPING 2
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#define MONITOR_STOPPED 3
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#define MONITOR_INTERVAL 10000 // in milliseconds
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#define MONITOR_DEFAULT_ID 1UL // unsigned long value
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/*
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* Create declarations of the enum for monitor events and also the array of
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* structs containing the matching names. The data is taken from def_monitor_event.h
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*/
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#undef ADDITEM
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#define ADDITEM( _event_type, _event_name ) _event_type
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typedef enum
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{
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#include "def_monitor_event.h"
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MAX_MONITOR_EVENT
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} monitor_event_t;
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#undef ADDITEM
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typedef struct monitor_def_s
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{
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char name[30];
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} monitor_def_t;
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extern const monitor_def_t monitor_event_definitions[];
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/**
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* The linked list of servers that are being monitored by the monitor module.
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*/
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typedef struct monitor_servers
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{
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SERVER *server; /**< The server being monitored */
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MYSQL *con; /**< The MySQL connection */
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bool log_version_err;
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int mon_err_count;
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unsigned int mon_prev_status;
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unsigned int pending_status; /**< Pending Status flag bitmap */
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struct monitor_servers *next; /**< The next server in the list */
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} MONITOR_SERVERS;
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/**
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* Representation of the running monitor.
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*/
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typedef struct monitor
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{
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char *name; /**< The name of the monitor module */
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char *user; /*< Monitor username */
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char *password; /*< Monitor password */
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SPINLOCK lock;
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CONFIG_PARAMETER* parameters; /*< configuration parameters */
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MONITOR_SERVERS* databases; /*< List of databases the monitor monitors */
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monitor_state_t state; /**< The state of the monitor */
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int connect_timeout; /**< Connect timeout in seconds for mysql_real_connect */
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int read_timeout; /**< Timeout in seconds to read from the server.
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* There are retries and the total effective timeout
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* value is three times the option value.
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*/
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int write_timeout; /**< Timeout in seconds for each attempt to write to the server.
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* There are retries and the total effective timeout value is
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* two times the option value.
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*/
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MONITOR_OBJECT *module; /**< The "monitor object" */
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void *handle; /**< Handle returned from startMonitor */
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size_t interval; /**< The monitor interval */
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struct monitor *next; /**< Next monitor in the linked list */
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} MONITOR;
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extern MONITOR *monitor_alloc(char *, char *);
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extern void monitor_free(MONITOR *);
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extern MONITOR *monitor_find(char *);
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extern void monitorAddServer(MONITOR *, SERVER *);
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extern void monitorAddUser(MONITOR *, char *, char *);
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extern void monitorAddParameters(MONITOR *monitor, CONFIG_PARAMETER *params);
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extern void monitorStop(MONITOR *);
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extern void monitorStart(MONITOR *, void*);
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extern void monitorStopAll();
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extern void monitorStartAll();
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extern void monitorShowAll(DCB *);
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extern void monitorShow(DCB *, MONITOR *);
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extern void monitorList(DCB *);
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extern void monitorSetInterval (MONITOR *, unsigned long);
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extern bool monitorSetNetworkTimeout(MONITOR *, int, int);
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extern RESULTSET *monitorGetList();
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extern bool check_monitor_permissions(MONITOR* monitor, const char* query);
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monitor_event_t mon_name_to_event(const char* tok);
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monitor_event_t mon_get_event_type(MONITOR_SERVERS* node);
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const char* mon_get_event_name(MONITOR_SERVERS* node);
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void monitor_clear_pending_status(MONITOR_SERVERS *ptr, int bit);
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void monitor_set_pending_status(MONITOR_SERVERS *ptr, int bit);
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bool mon_status_changed(MONITOR_SERVERS* mon_srv);
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bool mon_print_fail_status(MONITOR_SERVERS* mon_srv);
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void monitor_launch_script(MONITOR* mon, MONITOR_SERVERS* ptr, char* script);
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int mon_parse_event_string(bool* events, size_t count, char* string);
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connect_result_t mon_connect_to_db(MONITOR* mon, MONITOR_SERVERS *database);
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void mon_log_connect_error(MONITOR_SERVERS* database, connect_result_t rval);
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void mon_log_state_change(MONITOR_SERVERS *ptr);
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/**
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* @brief Hangup connections to failed servers
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*
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* Injects hangup events for DCB that are connected to servers that are down.
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*
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* @param monitor Monitor object
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*/
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void mon_hangup_failed_servers(MONITOR *monitor);
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#endif
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