197 lines
6.6 KiB
C++
197 lines
6.6 KiB
C++
/*
|
|
* Copyright (c) 2019 MariaDB Corporation Ab
|
|
*
|
|
* Use of this software is governed by the Business Source License included
|
|
* in the LICENSE.TXT file and at www.mariadb.com/bsl11.
|
|
*
|
|
* Change Date: 2023-01-01
|
|
*
|
|
* On the date above, in accordance with the Business Source License, use
|
|
* of this software will be governed by version 2 or later of the General
|
|
* Public License.
|
|
*/
|
|
#pragma once
|
|
|
|
#include <maxscale/monitor.hh>
|
|
|
|
class ResultSet;
|
|
|
|
/**
|
|
* This class contains internal monitor management functions that should not be exposed in the public
|
|
* monitor class. It's a friend of MXS_MONITOR.
|
|
*/
|
|
class MonitorManager
|
|
{
|
|
public:
|
|
|
|
/**
|
|
* Creates a new monitor. Loads the module, calls constructor and configure, and adds monitor to the
|
|
* global list.
|
|
*
|
|
* @param name The configuration name of the monitor
|
|
* @param module The module name to load
|
|
* @return The newly created monitor, or NULL on error
|
|
*/
|
|
static mxs::Monitor* create_monitor(const std::string& name, const std::string& module,
|
|
MXS_CONFIG_PARAMETER* params);
|
|
|
|
/**
|
|
* Mark monitor as deactivated. A deactivated monitor appears not to exist, as if it had been
|
|
* destroyed. Any servers the monitor had are removed. The monitor should not be serialized after
|
|
* this function.
|
|
*
|
|
* @param monitor Monitor to deactivate
|
|
*/
|
|
static void deactivate_monitor(mxs::Monitor* monitor);
|
|
|
|
/**
|
|
* @brief Destroys all monitors. At this point all monitors should
|
|
* have been stopped.
|
|
*
|
|
* @attn Must only be called in single-thread context at system shutdown.
|
|
*/
|
|
static void destroy_all_monitors();
|
|
|
|
static void start_monitor(mxs::Monitor* monitor);
|
|
|
|
/**
|
|
* Stop a given monitor
|
|
*
|
|
* @param monitor The monitor to stop
|
|
*/
|
|
static void stop_monitor(mxs::Monitor* monitor);
|
|
|
|
static void stop_all_monitors();
|
|
static void start_all_monitors();
|
|
|
|
static mxs::Monitor* find_monitor(const char* name);
|
|
|
|
/**
|
|
* Populate services with the servers of the monitors. Should be called at the end of configuration file
|
|
* processing to ensure that services are notified of the servers a monitor has. During runtime, the
|
|
* normal add/remove server functions do the notifying. TODO: If a service is created at runtime, is
|
|
* it properly populated?
|
|
*/
|
|
static void populate_services();
|
|
|
|
/**
|
|
* Get links to monitors that relate to a server.
|
|
*
|
|
* @param server Server to inspect
|
|
* @param host Hostname of this server
|
|
* @return Array of monitor links or NULL if no relations exist
|
|
*/
|
|
static json_t* monitor_relations_to_server(const SERVER* server, const char* host);
|
|
|
|
/**
|
|
* Convert all monitors to JSON.
|
|
*
|
|
* @param host Hostname of this server
|
|
* @return JSON array containing all monitors
|
|
*/
|
|
static json_t* monitor_list_to_json(const char* host);
|
|
|
|
/**
|
|
* Check if a server is being monitored and return the monitor.
|
|
* @param server Server that is queried
|
|
* @return The monitor watching this server, or NULL if not monitored
|
|
*/
|
|
static mxs::Monitor* server_is_monitored(const SERVER* server);
|
|
|
|
static void show_all_monitors(DCB* dcb);
|
|
static void monitor_show(DCB* dcb, mxs::Monitor* monitor);
|
|
|
|
static void monitor_list(DCB*);
|
|
|
|
static std::unique_ptr<ResultSet> monitor_get_list();
|
|
|
|
/**
|
|
* @brief Serialize a monitor to a file
|
|
*
|
|
* This converts the static configuration of the monitor into an INI format file.
|
|
*
|
|
* @param monitor Monitor to serialize
|
|
* @return True if serialization was successful
|
|
*/
|
|
static bool monitor_serialize(const mxs::Monitor* monitor);
|
|
|
|
/**
|
|
* Attempt to reconfigure a monitor. If the reconfiguration fails, the old parameters are restored.
|
|
* Should be only called from the admin thread.
|
|
*
|
|
* @param monitor Monitor to reconfigure
|
|
* @param parameters New parameters to apply
|
|
* @return True if reconfiguration was successful
|
|
*/
|
|
static bool reconfigure_monitor(mxs::Monitor* monitor, const MXS_CONFIG_PARAMETER& parameters);
|
|
|
|
/**
|
|
* Change one parameter in the monitor during runtime. Should only be called from the admin thread.
|
|
*
|
|
* @param monitor Monitor to reconfigure
|
|
* @param key Setting to change
|
|
* @param value New value
|
|
* @param error_out Error output
|
|
* @return True if reconfiguration was successful
|
|
*/
|
|
static bool alter_monitor(mxs::Monitor* monitor, const std::string& key, const std::string& value,
|
|
std::string* error_out);
|
|
|
|
/**
|
|
* Add server to monitor during runtime. Should only be called from the admin thread.
|
|
*
|
|
* @param mon Target monitor
|
|
* @param server Server to add
|
|
* @param error_out Error output
|
|
* @return True on success
|
|
*/
|
|
static bool add_server_to_monitor(mxs::Monitor* mon, SERVER* server, std::string* error_out);
|
|
|
|
/**
|
|
* Remove a server from a monitor during runtime. Should only be called from the admin thread.
|
|
*
|
|
* @param mon Target monitor
|
|
* @param server Server to remove
|
|
* @param error_out Error output
|
|
* @return True on success
|
|
*/
|
|
static bool remove_server_from_monitor(mxs::Monitor* mon, SERVER* server, std::string* error_out);
|
|
|
|
/**
|
|
* @brief Convert monitor to JSON
|
|
*
|
|
* @param monitor Monitor to convert
|
|
* @param host Hostname of this server
|
|
*
|
|
* @return JSON representation of the monitor
|
|
*/
|
|
static json_t* monitor_to_json(const mxs::Monitor* monitor, const char* host);
|
|
|
|
static bool create_monitor_config(const mxs::Monitor* monitor, const char* filename);
|
|
|
|
/**
|
|
* Set a status bit in the server. If the server is monitored, only some bits can be modified,
|
|
* and the modification goes through the monitor.
|
|
*
|
|
* @param bit The bit to set for the server
|
|
* @param errmsg_out Error output
|
|
* @return True on success
|
|
*/
|
|
static bool set_server_status(SERVER* srv, int bit, std::string* errmsg_out = NULL);
|
|
|
|
/**
|
|
* Clear a status bit in the server. If the server is monitored, only some bits can be modified,
|
|
* and the modification goes through the monitor.
|
|
*
|
|
* @param bit The bit to clear for the server
|
|
* @param errmsg_out Error output
|
|
* @return True on success
|
|
*/
|
|
static bool clear_server_status(SERVER* srv, int bit, std::string* errmsg_out);
|
|
|
|
/**
|
|
* Waits until all running monitors have advanced one tick.
|
|
*/
|
|
static void debug_wait_one_tick();
|
|
};
|