364 lines
13 KiB
C
364 lines
13 KiB
C
#pragma once
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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/bsl11.
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*
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* Change Date: 2020-01-01
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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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/**
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* @file include/maxscale/monitor.h - The public monitor interface
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*/
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#include <maxscale/cdefs.h>
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#include <mysql.h>
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#include <maxscale/config.h>
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#include <maxscale/dcb.h>
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#include <maxscale/server.h>
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#include <maxscale/jansson.h>
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MXS_BEGIN_DECLS
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struct mxs_monitor;
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typedef struct mxs_monitor MXS_MONITOR;
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/**
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* @verbatim
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* The "module object" structure for a backend monitor module
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*
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* Monitor modules monitor the backend databases that MaxScale connects to.
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* The information provided by a monitor is used in routing decisions.
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*
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* The entry points are:
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* startMonitor Called by main to start the monitor
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* stopMonitor Called by main to shut down and destroy a monitor
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* diagnostics Called for diagnostic output
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*
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* startMonitor is called to start the monitoring process, it is called on the
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* MaxScale main thread 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 threading
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* libraries. The return from startMonitor is a pointer that will be passed to
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* all other monitor API calls.
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*
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* @endverbatim
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*
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* @see load_module
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*/
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typedef struct mxs_monitor_object
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{
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/**
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* @brief Start the monitor
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*
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* This entry point is called when the monitor is started. If the monitor
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* requires polling of the servers, it should create a separate monitoring
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* thread.
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*
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* @param monitor The monitor object
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* @param params Parameters for this monitor
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*
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* @return Pointer to the monitor specific data, stored in @c monitor->handle
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*/
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void *(*startMonitor)(MXS_MONITOR *monitor, const MXS_CONFIG_PARAMETER *params);
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/**
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* @brief Stop the monitor
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*
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* This entry point is called when the monitor is stopped. If the monitor
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* uses a polling thread, the thread should be stopped.
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*
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* @param monitor The monitor object
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*/
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void (*stopMonitor)(MXS_MONITOR *monitor);
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void (*diagnostics)(DCB *, const MXS_MONITOR *);
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/**
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* @brief Return diagnostic information about the monitor
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*
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* @return A JSON object representing the state of the monitor
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*
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* @see jansson.h
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*/
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json_t* (*diagnostics_json)(const MXS_MONITOR *monitor);
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} MXS_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 using the rules defined in modinfo.h
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*/
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#define MXS_MONITOR_VERSION {3, 0, 0}
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/** Monitor's poll frequency */
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#define MXS_MON_BASE_INTERVAL_MS 100
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#define MXS_MONITOR_RUNNING 1
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#define MXS_MONITOR_STOPPING 2
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#define MXS_MONITOR_STOPPED 3
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#define MXS_MONITOR_DEFAULT_ID 1UL // unsigned long value
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#define MAX_MONITOR_USER_LEN 512
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#define MAX_MONITOR_PASSWORD_LEN 512
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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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* 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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} mxs_connect_result_t;
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/** Monitor events */
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typedef enum
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{
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UNDEFINED_EVENT = 0,
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MASTER_DOWN_EVENT = (1 << 0), /**< master_down */
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MASTER_UP_EVENT = (1 << 1), /**< master_up */
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SLAVE_DOWN_EVENT = (1 << 2), /**< slave_down */
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SLAVE_UP_EVENT = (1 << 3), /**< slave_up */
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SERVER_DOWN_EVENT = (1 << 4), /**< server_down */
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SERVER_UP_EVENT = (1 << 5), /**< server_up */
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SYNCED_DOWN_EVENT = (1 << 6), /**< synced_down */
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SYNCED_UP_EVENT = (1 << 7), /**< synced_up */
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DONOR_DOWN_EVENT = (1 << 8), /**< donor_down */
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DONOR_UP_EVENT = (1 << 9), /**< donor_up */
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NDB_DOWN_EVENT = (1 << 10), /**< ndb_down */
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NDB_UP_EVENT = (1 << 11), /**< ndb_up */
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LOST_MASTER_EVENT = (1 << 12), /**< lost_master */
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LOST_SLAVE_EVENT = (1 << 13), /**< lost_slave */
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LOST_SYNCED_EVENT = (1 << 14), /**< lost_synced */
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LOST_DONOR_EVENT = (1 << 15), /**< lost_donor */
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LOST_NDB_EVENT = (1 << 16), /**< lost_ndb */
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NEW_MASTER_EVENT = (1 << 17), /**< new_master */
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NEW_SLAVE_EVENT = (1 << 18), /**< new_slave */
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NEW_SYNCED_EVENT = (1 << 19), /**< new_synced */
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NEW_DONOR_EVENT = (1 << 20), /**< new_donor */
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NEW_NDB_EVENT = (1 << 21), /**< new_ndb */
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} mxs_monitor_event_t;
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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 monitored_server
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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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bool new_event; /**< Whether an action was taken on the last event */
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struct monitored_server *next; /**< The next server in the list */
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} MXS_MONITORED_SERVER;
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/**
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* Representation of the running monitor.
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*/
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struct mxs_monitor
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{
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char *name; /**< The name of the monitor module */
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char user[MAX_MONITOR_USER_LEN]; /*< Monitor username */
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char password[MAX_MONITOR_PASSWORD_LEN]; /*< Monitor password */
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SPINLOCK lock;
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MXS_CONFIG_PARAMETER* parameters; /*< configuration parameters */
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MXS_MONITORED_SERVER* monitored_servers; /*< List of servers 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 connect_attempts; /**< How many times a connection is attempted */
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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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MXS_MONITOR_OBJECT *module; /**< The "monitor object" */
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char *module_name; /**< Name of the monitor module */
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void *handle; /**< Handle returned from startMonitor */
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size_t interval; /**< The monitor interval */
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volatile bool server_pending_changes;
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/**< Are there any pending changes to a server?
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* If yes, the next monitor loop starts early. */
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bool active; /**< True if monitor is active */
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time_t journal_max_age; /**< Maximum age of journal file */
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uint32_t script_timeout; /**< Timeout in seconds for the monitor scripts */
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bool master_has_failed; /**< Set to true when the latest event is a master_down event */
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struct mxs_monitor *next; /**< Next monitor in the linked list */
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};
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static const MXS_ENUM_VALUE mxs_monitor_event_enum_values[] =
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{
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{"master_down", MASTER_DOWN_EVENT},
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{"master_up", MASTER_UP_EVENT},
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{"slave_down", SLAVE_DOWN_EVENT},
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{"slave_up", SLAVE_UP_EVENT},
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{"server_down", SERVER_DOWN_EVENT},
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{"server_up", SERVER_UP_EVENT},
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{"synced_down", SYNCED_DOWN_EVENT},
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{"synced_up", SYNCED_UP_EVENT},
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{"donor_down", DONOR_DOWN_EVENT},
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{"donor_up", DONOR_UP_EVENT},
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{"ndb_down", NDB_DOWN_EVENT},
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{"ndb_up", NDB_UP_EVENT},
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{"lost_master", LOST_MASTER_EVENT},
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{"lost_slave", LOST_SLAVE_EVENT},
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{"lost_synced", LOST_SYNCED_EVENT},
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{"lost_donor", LOST_DONOR_EVENT},
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{"lost_ndb", LOST_NDB_EVENT},
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{"new_master", NEW_MASTER_EVENT},
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{"new_slave", NEW_SLAVE_EVENT},
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{"new_synced", NEW_SYNCED_EVENT},
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{"new_donor", NEW_DONOR_EVENT},
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{"new_ndb", NEW_NDB_EVENT},
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{NULL}
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};
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/** Default value for the `events` parameter */
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static const char MXS_MONITOR_EVENT_DEFAULT_VALUE[] = "master_down,master_up,slave_down,"
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"slave_up,server_down,server_up,synced_down,synced_up,donor_down,donor_up,"
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"ndb_down,ndb_up,lost_master,lost_slave,lost_synced,lost_donor,lost_ndb,"
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"new_master,new_slave,new_synced,new_donor,new_ndb";
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/**
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* Monitor configuration parameters names
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*/
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extern const char CN_BACKEND_CONNECT_ATTEMPTS[];
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extern const char CN_BACKEND_READ_TIMEOUT[];
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extern const char CN_BACKEND_WRITE_TIMEOUT[];
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extern const char CN_BACKEND_CONNECT_TIMEOUT[];
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extern const char CN_MONITOR_INTERVAL[];
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extern const char CN_JOURNAL_MAX_AGE[];
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extern const char CN_SCRIPT_TIMEOUT[];
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extern const char CN_SCRIPT[];
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extern const char CN_EVENTS[];
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bool check_monitor_permissions(MXS_MONITOR* monitor, const char* query);
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void monitor_clear_pending_status(MXS_MONITORED_SERVER *ptr, int bit);
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void monitor_set_pending_status(MXS_MONITORED_SERVER *ptr, int bit);
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void servers_status_pending_to_current(MXS_MONITOR *monitor);
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void servers_status_current_to_pending(MXS_MONITOR *monitor);
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bool mon_status_changed(MXS_MONITORED_SERVER* mon_srv);
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bool mon_print_fail_status(MXS_MONITORED_SERVER* mon_srv);
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mxs_connect_result_t mon_ping_or_connect_to_db(MXS_MONITOR* mon, MXS_MONITORED_SERVER *database);
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void mon_log_connect_error(MXS_MONITORED_SERVER* database, mxs_connect_result_t rval);
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const char* mon_get_event_name(mxs_monitor_event_t event);
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void lock_monitor_servers(MXS_MONITOR *monitor);
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void release_monitor_servers(MXS_MONITOR *monitor);
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/**
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* Alter monitor parameters
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*
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* The monitor parameters should not be altered while the monitor is
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* running. To alter a parameter from outside a monitor module, stop the monitor,
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* do the alteration and then restart the monitor. The monitor "owns" the parameters
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* as long as it is running so if the monitor needs to change its own parameters,
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* it can do it without stopping itself.
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*
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* @param monitor Monitor whose parameter is altered
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* @param key Parameter name to alter
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* @param value New value for the parameter
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*/
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void mon_alter_parameter(MXS_MONITOR* monitor, const char* key, const char* value);
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/**
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* @brief Handle state change events
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*
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* This function should be called by all monitors at the end of each monitoring
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* cycle. This will log state changes and execute any scripts that should be executed.
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*
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* @param monitor Monitor object
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* @param script Script to execute or NULL for no script
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* @param events Enabled events
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*/
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void mon_process_state_changes(MXS_MONITOR *monitor, const char *script, uint64_t events);
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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(MXS_MONITOR *monitor);
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/**
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* @brief Report query errors
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*
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* @param db Database where the query failed
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*/
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void mon_report_query_error(MXS_MONITORED_SERVER* db);
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/**
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* @brief Convert monitor to JSON
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*
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* @param monitor Monitor to convert
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* @param host Hostname of this server
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*
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* @return JSON representation of the monitor
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*/
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json_t* monitor_to_json(const MXS_MONITOR* monitor, const char* host);
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/**
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* @brief Convert all monitors to JSON
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*
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* @param host Hostname of this server
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*
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* @return JSON array containing all monitors
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*/
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json_t* monitor_list_to_json(const char* host);
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/**
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* @brief Get links to monitors that relate to a server
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*
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* @param server Server to inspect
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* @param host Hostname of this server
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*
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* @return Array of monitor links or NULL if no relations exist
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*/
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json_t* monitor_relations_to_server(const SERVER* server, const char* host);
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/**
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* @brief Store a journal of server states
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*
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* @param monitor Monitor to journal
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* @param master The current master server or NULL if no master exists
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*/
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void store_server_journal(MXS_MONITOR *monitor, MXS_MONITORED_SERVER *master);
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/**
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* @brief Load a journal of server states
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*
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* @param monitor Monitor where journal is loaded
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* @param master Set to point to the current master
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*/
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void load_server_journal(MXS_MONITOR *monitor, MXS_MONITORED_SERVER **master);
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MXS_END_DECLS
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