2949 lines
83 KiB
C++
2949 lines
83 KiB
C++
/*
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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: 2022-01-01
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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 monitor.c - The monitor module management routines
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*/
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#include <maxscale/monitor.hh>
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#include <fcntl.h>
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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 <chrono>
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#include <string>
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#include <sstream>
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#include <set>
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#include <zlib.h>
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#include <sys/stat.h>
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#include <vector>
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#include <mutex>
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#include <maxscale/alloc.h>
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#include <maxbase/atomic.hh>
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#include <maxscale/clock.h>
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#include <maxscale/json_api.h>
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#include <maxscale/mariadb.hh>
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#include <maxscale/mysql_utils.hh>
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#include <maxscale/paths.h>
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#include <maxscale/pcre2.h>
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#include <maxscale/routingworker.hh>
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#include <maxscale/secrets.h>
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#include <maxscale/utils.hh>
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#include <maxscale/json_api.h>
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#include <mysqld_error.h>
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#include "internal/config.hh"
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#include "internal/externcmd.hh"
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#include "internal/monitor.hh"
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#include "internal/modules.hh"
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#include "internal/server.hh"
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/** Schema version, journals must have a matching version */
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#define MMB_SCHEMA_VERSION 2
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/** Constants for byte lengths of the values */
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#define MMB_LEN_BYTES 4
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#define MMB_LEN_SCHEMA_VERSION 1
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#define MMB_LEN_CRC32 4
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#define MMB_LEN_VALUE_TYPE 1
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#define MMB_LEN_SERVER_STATUS 8
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/** Type of the stored value */
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enum stored_value_type
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{
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SVT_SERVER = 1, // Generic server state information
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SVT_MASTER = 2, // The master server name
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};
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using std::string;
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using std::set;
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using Guard = std::lock_guard<std::mutex>;
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const char CN_BACKEND_CONNECT_ATTEMPTS[] = "backend_connect_attempts";
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const char CN_BACKEND_CONNECT_TIMEOUT[] = "backend_connect_timeout";
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const char CN_BACKEND_READ_TIMEOUT[] = "backend_read_timeout";
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const char CN_BACKEND_WRITE_TIMEOUT[] = "backend_write_timeout";
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const char CN_DISK_SPACE_CHECK_INTERVAL[] = "disk_space_check_interval";
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const char CN_EVENTS[] = "events";
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const char CN_JOURNAL_MAX_AGE[] = "journal_max_age";
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const char CN_MONITOR_INTERVAL[] = "monitor_interval";
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const char CN_SCRIPT[] = "script";
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const char CN_SCRIPT_TIMEOUT[] = "script_timeout";
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namespace
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{
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class ThisUnit
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{
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public:
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/**
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* Call a function on every monitor in the global monitor list.
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*
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* @param apply The function to apply. If the function returns false, iteration is discontinued.
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*/
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void foreach_monitor(std::function<bool(Monitor*)> apply)
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{
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Guard guard(m_all_monitors_lock);
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for (Monitor* monitor : m_all_monitors)
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{
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if (!apply(monitor))
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{
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break;
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}
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}
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}
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/**
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* Clear the internal list and return previous contents.
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*
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* @return Contents before clearing
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*/
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std::vector<Monitor*> clear()
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{
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Guard guard(m_all_monitors_lock);
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return std::move(m_all_monitors);
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}
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void insert_front(Monitor* monitor)
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{
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Guard guard(m_all_monitors_lock);
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m_all_monitors.insert(m_all_monitors.begin(), monitor);
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}
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void run_behind_lock(std::function<void(void)> apply)
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{
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Guard guard(m_all_monitors_lock);
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apply();
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}
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private:
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std::mutex m_all_monitors_lock; /**< Protects access to array */
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std::vector<Monitor*> m_all_monitors; /**< Global list of monitors, in configuration file order */
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};
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ThisUnit this_unit;
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}
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static void monitor_server_free_all(std::vector<MXS_MONITORED_SERVER*>& servers);
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static void remove_server_journal(Monitor* monitor);
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static const char* monitor_state_to_string(monitor_state_t state);
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/** Server type specific bits */
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static uint64_t server_type_bits = SERVER_MASTER | SERVER_SLAVE | SERVER_JOINED | SERVER_NDB;
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/** All server bits */
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static uint64_t all_server_bits = SERVER_RUNNING | SERVER_MAINT | SERVER_MASTER | SERVER_SLAVE
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| SERVER_JOINED | SERVER_NDB;
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Monitor* MonitorManager::create_monitor(const string& name, const string& module,
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MXS_CONFIG_PARAMETER* params)
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{
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MXS_MONITOR_API* api = (MXS_MONITOR_API*)load_module(module.c_str(), MODULE_MONITOR);
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if (!api)
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{
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MXS_ERROR("Unable to load library file for monitor '%s'.", name.c_str());
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return NULL;
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}
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Monitor* mon = api->createInstance(name, module);
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if (!mon)
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{
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MXS_ERROR("Unable to create monitor instance for '%s', using module '%s'.",
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name.c_str(), module.c_str());
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return NULL;
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}
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if (mon->configure_base(params)) // TODO: Move derived class configure() here
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{
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this_unit.insert_front(mon);
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}
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else
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{
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delete mon;
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mon = NULL;
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}
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return mon;
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}
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Monitor::Monitor(const string& name, const string& module)
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: m_name(MXS_STRDUP_A(name.c_str()))
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, m_module(module)
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{
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memset(m_journal_hash, 0, sizeof(m_journal_hash));
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}
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bool Monitor::configure_base(const MXS_CONFIG_PARAMETER* params)
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{
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m_settings.conn_settings.read_timeout = params->get_integer(CN_BACKEND_READ_TIMEOUT);
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m_settings.conn_settings.write_timeout = params->get_integer(CN_BACKEND_WRITE_TIMEOUT);
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m_settings.conn_settings.connect_timeout = params->get_integer(CN_BACKEND_CONNECT_TIMEOUT);
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m_settings.conn_settings.connect_attempts = params->get_integer(CN_BACKEND_CONNECT_ATTEMPTS);
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m_settings.interval = params->get_integer(CN_MONITOR_INTERVAL);
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m_settings.journal_max_age = params->get_integer(CN_JOURNAL_MAX_AGE);
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m_settings.script_timeout = params->get_integer(CN_SCRIPT_TIMEOUT);
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m_settings.script = params->get_string(CN_SCRIPT);
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m_settings.events = params->get_enum(CN_EVENTS, mxs_monitor_event_enum_values);
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m_settings.disk_space_check_interval = params->get_integer(CN_DISK_SPACE_CHECK_INTERVAL);
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m_settings.conn_settings.username = params->get_string(CN_USER);
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m_settings.conn_settings.password = params->get_string(CN_PASSWORD);
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// The monitor serverlist has already been checked to be valid. Empty value is ok too.
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auto servers_temp = config_get_server_list(params, CN_SERVERS);
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for (auto elem : servers_temp)
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{
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// This function checks if server is already monitored. TODO: This should be a config error.
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monitor_add_server(this, elem);
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}
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/* The previous config values were normal types and were checked by the config manager
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* to be correct. The following is a complicated type and needs to be checked separately. */
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bool error = false;
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auto threshold_string = params->get_string(CN_DISK_SPACE_THRESHOLD);
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if (!set_disk_space_threshold(threshold_string))
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{
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MXS_ERROR("Invalid value for '%s' for monitor %s: %s",
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CN_DISK_SPACE_THRESHOLD, m_name, threshold_string.c_str());
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error = true;
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}
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if (!error)
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{
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// Store module name into parameter storage.
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monitor_set_parameter(this, CN_MODULE, m_module.c_str());
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// Add all config settings to text-mode storage. Needed for serialization.
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monitor_add_parameters(this, params);
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}
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return !error;
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}
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Monitor::~Monitor()
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{
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config_parameter_free(parameters);
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monitor_server_free_all(m_servers);
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MXS_FREE((const_cast<char*>(m_name)));
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}
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void MonitorManager::destroy_all_monitors()
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{
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auto monitors = this_unit.clear();
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for (auto monitor : monitors)
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{
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mxb_assert(monitor->m_state == MONITOR_STATE_STOPPED);
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delete monitor;
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}
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}
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/**
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* Start an individual monitor that has previously 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 MonitorManager::monitor_start(Monitor* monitor, const MXS_CONFIG_PARAMETER* params)
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{
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if (monitor)
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{
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Guard guard(monitor->m_lock);
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// Only start the monitor if it's stopped.
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if (monitor->m_state == MONITOR_STATE_STOPPED)
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{
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if (monitor->journal_is_stale())
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{
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MXS_WARNING("Removing stale journal file for monitor '%s'.", monitor->m_name);
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remove_server_journal(monitor);
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}
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if (monitor->start(params))
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{
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monitor->m_state = MONITOR_STATE_RUNNING;
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}
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else
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{
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MXS_ERROR("Failed to start monitor '%s'.", monitor->m_name);
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}
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}
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}
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}
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/**
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* Start all monitors
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*/
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void monitor_start_all()
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{
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this_unit.foreach_monitor([](Monitor* monitor) {
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if (monitor->m_active)
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{
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MonitorManager::monitor_start(monitor, monitor->parameters);
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}
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return true;
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});
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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 monitor_stop(Monitor* monitor)
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{
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if (monitor)
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{
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Guard guard(monitor->m_lock);
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/** Only stop the monitor if it is running */
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if (monitor->m_state == MONITOR_STATE_RUNNING)
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{
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monitor->m_state = MONITOR_STATE_STOPPING;
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monitor->stop();
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monitor->m_state = MONITOR_STATE_STOPPED;
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for (auto db : monitor->m_servers)
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{
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// TODO: Create a generic entry point for this or move it inside stopMonitor
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mysql_close(db->con);
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db->con = NULL;
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}
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}
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}
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}
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void monitor_deactivate(Monitor* monitor)
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{
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this_unit.run_behind_lock([monitor](){
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monitor->m_active = false;
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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 monitor_stop_all()
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{
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this_unit.foreach_monitor([](Monitor* monitor) {
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if (monitor->m_active)
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{
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monitor_stop(monitor);
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}
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return true;
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});
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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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bool monitor_add_server(Monitor* mon, SERVER* server)
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{
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mxb_assert(mon && server);
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bool rval = false;
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if (monitor_server_in_use(server))
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{
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MXS_ERROR("Server '%s' is already monitored.", server->name());
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}
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else
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{
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rval = true;
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MXS_MONITORED_SERVER* db = new (std::nothrow) MXS_MONITORED_SERVER(server);
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MXS_ABORT_IF_NULL(db);
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monitor_state_t old_state = mon->m_state;
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if (old_state == MONITOR_STATE_RUNNING)
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{
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monitor_stop(mon);
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}
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{
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Guard guard(mon->m_lock);
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mon->m_servers.push_back(db);
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}
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if (old_state == MONITOR_STATE_RUNNING)
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{
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MonitorManager::monitor_start(mon, mon->parameters);
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}
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}
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return rval;
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}
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static void monitor_server_free(MXS_MONITORED_SERVER* tofree)
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{
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if (tofree)
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{
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if (tofree->con)
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{
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mysql_close(tofree->con);
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}
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delete tofree;
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}
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}
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/**
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* Free monitor server list
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* @param servers Servers to free
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*/
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static void monitor_server_free_all(std::vector<MXS_MONITORED_SERVER*>& servers)
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{
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for (auto server : servers)
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{
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monitor_server_free(server);
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}
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servers.clear();
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}
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/**
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* Remove a server from a monitor.
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*
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* @param mon The Monitor instance
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* @param server The Server to remove
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*/
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void monitor_remove_server(Monitor* mon, SERVER* server)
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{
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monitor_state_t old_state = mon->m_state;
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if (old_state == MONITOR_STATE_RUNNING)
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{
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monitor_stop(mon);
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}
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MXS_MONITORED_SERVER* ptr = nullptr;
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{
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Guard guard(mon->m_lock);
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for (auto iter = mon->m_servers.begin(); iter != mon->m_servers.end(); ++iter)
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{
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if ((*iter)->server == server)
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{
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ptr = *iter;
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mon->m_servers.erase(iter);
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break;
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}
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}
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}
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if (ptr)
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{
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monitor_server_free(ptr);
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}
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if (old_state == MONITOR_STATE_RUNNING)
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{
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MonitorManager::monitor_start(mon, mon->parameters);
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}
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}
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void Monitor::set_user(const string& user)
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{
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m_settings.conn_settings.username = user;
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}
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void Monitor::set_password(const string& passwd)
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{
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m_settings.conn_settings.password = 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 monitor_show_all(DCB* dcb)
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{
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this_unit.foreach_monitor([dcb](Monitor* monitor) {
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if (monitor->m_active)
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{
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monitor_show(dcb, monitor);
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}
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return true;
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});
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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 monitor_show(DCB* dcb, Monitor* monitor)
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{
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monitor->show(dcb);
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}
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void Monitor::show(DCB* dcb)
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{
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Monitor* monitor = this;
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dcb_printf(dcb, "Monitor: %p\n", monitor);
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dcb_printf(dcb, "Name: %s\n", m_name);
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dcb_printf(dcb, "State: %s\n", monitor_state_to_string(m_state));
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dcb_printf(dcb, "Times monitored: %lu\n", m_ticks);
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dcb_printf(dcb, "Sampling interval: %lu milliseconds\n", m_settings.interval);
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dcb_printf(dcb, "Connect Timeout: %i seconds\n", m_settings.conn_settings.connect_timeout);
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dcb_printf(dcb, "Read Timeout: %i seconds\n", m_settings.conn_settings.read_timeout);
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dcb_printf(dcb, "Write Timeout: %i seconds\n", m_settings.conn_settings.write_timeout);
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dcb_printf(dcb, "Connect attempts: %i \n", m_settings.conn_settings.connect_attempts);
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dcb_printf(dcb, "Monitored servers: ");
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const char* sep = "";
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for (MXS_MONITORED_SERVER* db : monitor->m_servers)
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{
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dcb_printf(dcb, "%s[%s]:%d", sep, db->server->address, db->server->port);
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sep = ", ";
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}
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dcb_printf(dcb, "\n");
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if (m_state == MONITOR_STATE_RUNNING)
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{
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monitor->diagnostics(dcb);
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}
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else
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{
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dcb_printf(dcb, " (no diagnostics)\n");
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}
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dcb_printf(dcb, "\n");
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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 monitor_list(DCB* dcb)
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{
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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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this_unit.foreach_monitor([dcb](Monitor* ptr){
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if (ptr->m_active)
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{
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dcb_printf(dcb,
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"%-20s | %s\n",
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ptr->m_name,
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ptr->m_state & MONITOR_STATE_RUNNING ?
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"Running" : "Stopped");
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}
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return true;
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});
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dcb_printf(dcb, "---------------------+---------------------\n");
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}
|
|
|
|
/**
|
|
* Find a monitor by name
|
|
*
|
|
* @param name The name of the monitor
|
|
* @return Pointer to the monitor or NULL
|
|
*/
|
|
Monitor* monitor_find(const char* name)
|
|
{
|
|
Monitor* rval = nullptr;
|
|
this_unit.foreach_monitor([&rval, name](Monitor* ptr) {
|
|
if (!strcmp(ptr->m_name, name) && ptr->m_active)
|
|
{
|
|
rval = ptr;
|
|
}
|
|
return (rval == nullptr);
|
|
});
|
|
return rval;
|
|
}
|
|
/**
|
|
* Find a destroyed monitor by name
|
|
*
|
|
* @param name The name of the monitor
|
|
* @return Pointer to the destroyed monitor or NULL if monitor is not found
|
|
*/
|
|
Monitor* monitor_repurpose_destroyed(const char* name, const char* module)
|
|
{
|
|
Monitor* rval = NULL;
|
|
this_unit.foreach_monitor([&rval, name, module](Monitor* monitor) {
|
|
if (strcmp(monitor->m_name, name) == 0 && (monitor->m_module == module))
|
|
{
|
|
mxb_assert(!monitor->m_active);
|
|
monitor->m_active = true;
|
|
rval = monitor;
|
|
}
|
|
return (rval == nullptr);
|
|
});
|
|
return rval;
|
|
}
|
|
|
|
/**
|
|
* Set the monitor sampling interval.
|
|
*
|
|
* @param interval The sampling interval in milliseconds
|
|
*/
|
|
void Monitor::set_interval(int64_t interval)
|
|
{
|
|
m_settings.interval = interval;
|
|
}
|
|
|
|
/**
|
|
* Set the maximum age of the monitor journal
|
|
*
|
|
* @param interval The journal age in seconds
|
|
*/
|
|
void Monitor::monitor_set_journal_max_age(time_t value)
|
|
{
|
|
m_settings.journal_max_age = value;
|
|
}
|
|
|
|
void Monitor::set_script_timeout(int value)
|
|
{
|
|
m_settings.script_timeout = value;
|
|
}
|
|
|
|
bool Monitor::set_network_timeout(int type, int value, const char* key)
|
|
{
|
|
bool rval = true;
|
|
|
|
if (value > 0)
|
|
{
|
|
switch (type)
|
|
{
|
|
case MONITOR_CONNECT_TIMEOUT:
|
|
m_settings.conn_settings.connect_timeout = value;
|
|
break;
|
|
|
|
case MONITOR_READ_TIMEOUT:
|
|
m_settings.conn_settings.read_timeout = value;
|
|
break;
|
|
|
|
case MONITOR_WRITE_TIMEOUT:
|
|
m_settings.conn_settings.write_timeout = value;
|
|
break;
|
|
|
|
case MONITOR_CONNECT_ATTEMPTS:
|
|
m_settings.conn_settings.connect_attempts = value;
|
|
break;
|
|
|
|
default:
|
|
MXS_ERROR("Monitor setNetworkTimeout received an unsupported action type %i", type);
|
|
mxb_assert(!true);
|
|
rval = false;
|
|
break;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
MXS_ERROR("Value '%s' for monitor '%s' is not a positive integer: %d", key, m_name, value);
|
|
rval = false;
|
|
}
|
|
return rval;
|
|
}
|
|
|
|
/**
|
|
* Return a resultset that has the current set of monitors in it
|
|
*
|
|
* @return A Result set
|
|
*/
|
|
std::unique_ptr<ResultSet> monitor_get_list()
|
|
{
|
|
std::unique_ptr<ResultSet> set = ResultSet::create({"Monitor", "Status"});
|
|
this_unit.foreach_monitor([&set](Monitor* ptr) {
|
|
const char* state = ptr->m_state & MONITOR_STATE_RUNNING ? "Running" : "Stopped";
|
|
set->add_row({ptr->m_name, state});
|
|
return true;
|
|
});
|
|
return set;
|
|
}
|
|
|
|
bool Monitor::test_permissions(const string& query)
|
|
{
|
|
auto monitor = this;
|
|
if (monitor->m_servers.empty() || config_get_global_options()->skip_permission_checks)
|
|
{
|
|
return true;
|
|
}
|
|
|
|
char* dpasswd = decrypt_password(m_settings.conn_settings.password.c_str());
|
|
bool rval = false;
|
|
|
|
for (MXS_MONITORED_SERVER* mondb : monitor->m_servers)
|
|
{
|
|
if (!mon_connection_is_ok(mondb->ping_or_connect(m_settings.conn_settings)))
|
|
{
|
|
MXS_ERROR("[%s] Failed to connect to server '%s' ([%s]:%d) when"
|
|
" checking monitor user credentials and permissions: %s",
|
|
monitor->m_name,
|
|
mondb->server->name(),
|
|
mondb->server->address,
|
|
mondb->server->port,
|
|
mysql_error(mondb->con));
|
|
switch (mysql_errno(mondb->con))
|
|
{
|
|
case ER_ACCESS_DENIED_ERROR:
|
|
case ER_DBACCESS_DENIED_ERROR:
|
|
case ER_ACCESS_DENIED_NO_PASSWORD_ERROR:
|
|
break;
|
|
|
|
default:
|
|
rval = true;
|
|
break;
|
|
}
|
|
}
|
|
else if (mxs_mysql_query(mondb->con, query.c_str()) != 0)
|
|
{
|
|
switch (mysql_errno(mondb->con))
|
|
{
|
|
case ER_TABLEACCESS_DENIED_ERROR:
|
|
case ER_COLUMNACCESS_DENIED_ERROR:
|
|
case ER_SPECIFIC_ACCESS_DENIED_ERROR:
|
|
case ER_PROCACCESS_DENIED_ERROR:
|
|
case ER_KILL_DENIED_ERROR:
|
|
rval = false;
|
|
break;
|
|
|
|
default:
|
|
rval = true;
|
|
break;
|
|
}
|
|
|
|
MXS_ERROR("[%s] Failed to execute query '%s' with user '%s'. MySQL error message: %s",
|
|
m_name, query.c_str(), m_settings.conn_settings.username.c_str(),
|
|
mysql_error(mondb->con));
|
|
}
|
|
else
|
|
{
|
|
rval = true;
|
|
MYSQL_RES* res = mysql_use_result(mondb->con);
|
|
if (res == NULL)
|
|
{
|
|
MXS_ERROR("[%s] Result retrieval failed when checking monitor permissions: %s",
|
|
monitor->m_name,
|
|
mysql_error(mondb->con));
|
|
}
|
|
else
|
|
{
|
|
mysql_free_result(res);
|
|
}
|
|
}
|
|
}
|
|
|
|
MXS_FREE(dpasswd);
|
|
return rval;
|
|
}
|
|
|
|
/**
|
|
* Add parameters to the monitor
|
|
* @param monitor Monitor
|
|
* @param params Config parameters
|
|
*/
|
|
void monitor_add_parameters(Monitor* monitor, const MXS_CONFIG_PARAMETER* params)
|
|
{
|
|
Guard guard(monitor->m_lock);
|
|
while (params)
|
|
{
|
|
MXS_CONFIG_PARAMETER* old = config_get_param(monitor->parameters, params->name);
|
|
|
|
if (old)
|
|
{
|
|
MXS_FREE(old->value);
|
|
old->value = MXS_STRDUP_A(params->value);
|
|
}
|
|
else
|
|
{
|
|
MXS_CONFIG_PARAMETER* clone = config_clone_param(params);
|
|
clone->next = monitor->parameters;
|
|
monitor->parameters = clone;
|
|
}
|
|
|
|
params = params->next;
|
|
}
|
|
}
|
|
|
|
void monitor_set_parameter(Monitor* monitor, const char* key, const char* value)
|
|
{
|
|
monitor_remove_parameter(monitor, key);
|
|
MXS_CONFIG_PARAMETER p = {};
|
|
p.name = const_cast<char*>(key);
|
|
p.value = const_cast<char*>(value);
|
|
monitor_add_parameters(monitor, &p);
|
|
}
|
|
|
|
bool monitor_remove_parameter(Monitor* monitor, const char* key)
|
|
{
|
|
MXS_CONFIG_PARAMETER* prev = NULL;
|
|
bool rval = false;
|
|
Guard guard(monitor->m_lock);
|
|
|
|
for (MXS_CONFIG_PARAMETER* p = monitor->parameters; p; p = p->next)
|
|
{
|
|
if (strcmp(p->name, key) == 0)
|
|
{
|
|
if (p == monitor->parameters)
|
|
{
|
|
monitor->parameters = monitor->parameters->next;
|
|
}
|
|
else
|
|
{
|
|
prev->next = p->next;
|
|
}
|
|
|
|
p->next = NULL;
|
|
config_parameter_free(p);
|
|
rval = true;
|
|
break;
|
|
}
|
|
|
|
prev = p;
|
|
}
|
|
|
|
return rval;
|
|
}
|
|
|
|
void mon_alter_parameter(Monitor* monitor, const char* key, const char* value)
|
|
{
|
|
Guard guard(monitor->m_lock);
|
|
for (MXS_CONFIG_PARAMETER* p = monitor->parameters; p; p = p->next)
|
|
{
|
|
if (strcmp(p->name, key) == 0)
|
|
{
|
|
MXS_FREE(p->value);
|
|
p->value = MXS_STRDUP_A(value);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
void monitor_stash_current_status(MXS_MONITORED_SERVER* ptr)
|
|
{
|
|
ptr->mon_prev_status = ptr->server->status;
|
|
ptr->pending_status = ptr->server->status;
|
|
}
|
|
|
|
void monitor_set_pending_status(MXS_MONITORED_SERVER* ptr, uint64_t bit)
|
|
{
|
|
ptr->pending_status |= bit;
|
|
}
|
|
|
|
void monitor_clear_pending_status(MXS_MONITORED_SERVER* ptr, uint64_t bit)
|
|
{
|
|
ptr->pending_status &= ~bit;
|
|
}
|
|
|
|
/*
|
|
* Determine a monitor event, defined by the difference between the old
|
|
* status of a server and the new status.
|
|
*
|
|
* @param node The monitor server data for a particular server
|
|
* @result monitor_event_t A monitor event (enum)
|
|
*
|
|
* @note This function must only be called from mon_process_state_changes
|
|
*/
|
|
static mxs_monitor_event_t mon_get_event_type(MXS_MONITORED_SERVER* node)
|
|
{
|
|
typedef enum
|
|
{
|
|
DOWN_EVENT,
|
|
UP_EVENT,
|
|
LOSS_EVENT,
|
|
NEW_EVENT,
|
|
UNSUPPORTED_EVENT
|
|
} general_event_type;
|
|
|
|
general_event_type event_type = UNSUPPORTED_EVENT;
|
|
|
|
uint64_t prev = node->mon_prev_status & all_server_bits;
|
|
uint64_t present = node->server->status & all_server_bits;
|
|
|
|
if (prev == present)
|
|
{
|
|
/* This should never happen */
|
|
mxb_assert(false);
|
|
return UNDEFINED_EVENT;
|
|
}
|
|
|
|
if ((prev & SERVER_RUNNING) == 0)
|
|
{
|
|
/* The server was not running previously */
|
|
if ((present & SERVER_RUNNING) != 0)
|
|
{
|
|
event_type = UP_EVENT;
|
|
}
|
|
else
|
|
{
|
|
/* Otherwise, was not running and still is not running. This should never happen. */
|
|
mxb_assert(false);
|
|
}
|
|
}
|
|
else
|
|
{
|
|
/* Previous state must have been running */
|
|
if ((present & SERVER_RUNNING) == 0)
|
|
{
|
|
event_type = DOWN_EVENT;
|
|
}
|
|
else
|
|
{
|
|
/** These are used to detect whether we actually lost something or
|
|
* just transitioned from one state to another */
|
|
uint64_t prev_bits = prev & (SERVER_MASTER | SERVER_SLAVE);
|
|
uint64_t present_bits = present & (SERVER_MASTER | SERVER_SLAVE);
|
|
|
|
/* Was running and still is */
|
|
if ((!prev_bits || !present_bits || prev_bits == present_bits)
|
|
&& (prev & server_type_bits))
|
|
{
|
|
/* We used to know what kind of server it was */
|
|
event_type = LOSS_EVENT;
|
|
}
|
|
else
|
|
{
|
|
/* We didn't know what kind of server it was, now we do*/
|
|
event_type = NEW_EVENT;
|
|
}
|
|
}
|
|
}
|
|
|
|
mxs_monitor_event_t rval = UNDEFINED_EVENT;
|
|
|
|
switch (event_type)
|
|
{
|
|
case UP_EVENT:
|
|
rval = (present & SERVER_MASTER) ? MASTER_UP_EVENT :
|
|
(present & SERVER_SLAVE) ? SLAVE_UP_EVENT :
|
|
(present
|
|
& SERVER_JOINED) ? SYNCED_UP_EVENT :
|
|
(present
|
|
& SERVER_NDB) ?
|
|
NDB_UP_EVENT
|
|
:
|
|
SERVER_UP_EVENT;
|
|
break;
|
|
|
|
case DOWN_EVENT:
|
|
rval = (prev & SERVER_MASTER) ? MASTER_DOWN_EVENT :
|
|
(prev & SERVER_SLAVE) ? SLAVE_DOWN_EVENT :
|
|
(prev & SERVER_JOINED) ? SYNCED_DOWN_EVENT :
|
|
(prev
|
|
& SERVER_NDB) ?
|
|
NDB_DOWN_EVENT
|
|
:
|
|
SERVER_DOWN_EVENT;
|
|
break;
|
|
|
|
case LOSS_EVENT:
|
|
rval = (prev & SERVER_MASTER) ? LOST_MASTER_EVENT :
|
|
(prev & SERVER_SLAVE) ? LOST_SLAVE_EVENT :
|
|
(prev & SERVER_JOINED) ? LOST_SYNCED_EVENT :
|
|
(prev
|
|
& SERVER_NDB) ?
|
|
LOST_NDB_EVENT
|
|
:
|
|
UNDEFINED_EVENT;
|
|
break;
|
|
|
|
case NEW_EVENT:
|
|
rval = (present & SERVER_MASTER) ? NEW_MASTER_EVENT :
|
|
(present & SERVER_SLAVE) ? NEW_SLAVE_EVENT :
|
|
(present
|
|
& SERVER_JOINED) ? NEW_SYNCED_EVENT :
|
|
(present
|
|
& SERVER_NDB) ?
|
|
NEW_NDB_EVENT
|
|
:
|
|
UNDEFINED_EVENT;
|
|
break;
|
|
|
|
default:
|
|
/* This should never happen */
|
|
mxb_assert(false);
|
|
break;
|
|
}
|
|
|
|
mxb_assert(rval != UNDEFINED_EVENT);
|
|
return rval;
|
|
}
|
|
|
|
const char* mon_get_event_name(mxs_monitor_event_t event)
|
|
{
|
|
for (int i = 0; mxs_monitor_event_enum_values[i].name; i++)
|
|
{
|
|
if (mxs_monitor_event_enum_values[i].enum_value == event)
|
|
{
|
|
return mxs_monitor_event_enum_values[i].name;
|
|
}
|
|
}
|
|
|
|
mxb_assert(!true);
|
|
return "undefined_event";
|
|
}
|
|
|
|
/*
|
|
* Given a monitor event (enum) provide a text string equivalent
|
|
* @param node The monitor server data whose event is wanted
|
|
* @result string The name of the monitor event for the server
|
|
*/
|
|
static const char* mon_get_event_name(MXS_MONITORED_SERVER* node)
|
|
{
|
|
return mon_get_event_name((mxs_monitor_event_t)node->server->last_event);
|
|
}
|
|
|
|
void Monitor::append_node_names(char* dest, int len, int status, credentials_approach_t approach)
|
|
{
|
|
const char* separator = "";
|
|
// Some extra space for port and separator
|
|
char arr[SERVER::MAX_MONUSER_LEN + SERVER::MAX_MONPW_LEN + SERVER::MAX_ADDRESS_LEN + 64];
|
|
dest[0] = '\0';
|
|
|
|
for (auto iter = m_servers.begin(); iter != m_servers.end() && len; ++iter)
|
|
{
|
|
Server* server = static_cast<Server*>((*iter)->server);
|
|
if (status == 0 || server->status & status)
|
|
{
|
|
if (approach == CREDENTIALS_EXCLUDE)
|
|
{
|
|
snprintf(arr,
|
|
sizeof(arr),
|
|
"%s[%s]:%d",
|
|
separator,
|
|
server->address,
|
|
server->port);
|
|
}
|
|
else
|
|
{
|
|
string user = m_settings.conn_settings.username;
|
|
string password = m_settings.conn_settings.password;
|
|
string server_specific_monuser = server->monitor_user();
|
|
if (!server_specific_monuser.empty())
|
|
{
|
|
user = server_specific_monuser;
|
|
password = server->monitor_password();
|
|
}
|
|
|
|
snprintf(arr,
|
|
sizeof(arr),
|
|
"%s%s:%s@[%s]:%d",
|
|
separator,
|
|
user.c_str(),
|
|
password.c_str(),
|
|
server->address,
|
|
server->port);
|
|
}
|
|
|
|
separator = ",";
|
|
int arrlen = strlen(arr);
|
|
|
|
if (arrlen < len)
|
|
{
|
|
strcat(dest, arr);
|
|
len -= arrlen;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Check if current monitored server status has changed
|
|
*
|
|
* @param mon_srv The monitored server
|
|
* @return true if status has changed or false
|
|
*/
|
|
bool mon_status_changed(MXS_MONITORED_SERVER* mon_srv)
|
|
{
|
|
bool rval = false;
|
|
|
|
/* Previous status is -1 if not yet set */
|
|
if (mon_srv->mon_prev_status != static_cast<uint64_t>(-1))
|
|
{
|
|
|
|
uint64_t old_status = mon_srv->mon_prev_status & all_server_bits;
|
|
uint64_t new_status = mon_srv->server->status & all_server_bits;
|
|
|
|
/**
|
|
* The state has changed if the relevant state bits are not the same,
|
|
* the server is either running, stopping or starting and the server is
|
|
* not going into maintenance or coming out of it
|
|
*/
|
|
if (old_status != new_status
|
|
&& ((old_status | new_status) & SERVER_MAINT) == 0
|
|
&& ((old_status | new_status) & SERVER_RUNNING) == SERVER_RUNNING)
|
|
{
|
|
rval = true;
|
|
}
|
|
}
|
|
|
|
return rval;
|
|
}
|
|
|
|
/**
|
|
* Check if current monitored server has a loggable failure status
|
|
*
|
|
* @param mon_srv The monitored server
|
|
* @return true if failed status can be logged or false
|
|
*/
|
|
bool mon_print_fail_status(MXS_MONITORED_SERVER* mon_srv)
|
|
{
|
|
return mon_srv->server->is_down() && mon_srv->mon_err_count == 0;
|
|
}
|
|
|
|
static MXS_MONITORED_SERVER* find_parent_node(const std::vector<MXS_MONITORED_SERVER*>& servers,
|
|
MXS_MONITORED_SERVER* target)
|
|
{
|
|
MXS_MONITORED_SERVER* rval = NULL;
|
|
|
|
if (target->server->master_id > 0)
|
|
{
|
|
for (MXS_MONITORED_SERVER* node : servers)
|
|
{
|
|
if (node->server->node_id == target->server->master_id)
|
|
{
|
|
rval = node;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
return rval;
|
|
}
|
|
|
|
static std::string child_nodes(const std::vector<MXS_MONITORED_SERVER*>& servers,
|
|
MXS_MONITORED_SERVER* parent)
|
|
{
|
|
std::stringstream ss;
|
|
|
|
if (parent->server->node_id > 0)
|
|
{
|
|
bool have_content = false;
|
|
|
|
for (MXS_MONITORED_SERVER* node : servers)
|
|
{
|
|
if (node->server->master_id == parent->server->node_id)
|
|
{
|
|
if (have_content)
|
|
{
|
|
ss << ",";
|
|
}
|
|
|
|
ss << "[" << node->server->address << "]:" << node->server->port;
|
|
have_content = true;
|
|
}
|
|
}
|
|
}
|
|
|
|
return ss.str();
|
|
}
|
|
|
|
int Monitor::launch_command(MXS_MONITORED_SERVER* ptr, EXTERNCMD* cmd)
|
|
{
|
|
if (externcmd_matches(cmd, "$INITIATOR"))
|
|
{
|
|
char initiator[strlen(ptr->server->address) + 24]; // Extra space for port
|
|
snprintf(initiator, sizeof(initiator), "[%s]:%d", ptr->server->address, ptr->server->port);
|
|
externcmd_substitute_arg(cmd, "[$]INITIATOR", initiator);
|
|
}
|
|
|
|
if (externcmd_matches(cmd, "$PARENT"))
|
|
{
|
|
std::stringstream ss;
|
|
MXS_MONITORED_SERVER* parent = find_parent_node(m_servers, ptr);
|
|
|
|
if (parent)
|
|
{
|
|
ss << "[" << parent->server->address << "]:" << parent->server->port;
|
|
}
|
|
externcmd_substitute_arg(cmd, "[$]PARENT", ss.str().c_str());
|
|
}
|
|
|
|
if (externcmd_matches(cmd, "$CHILDREN"))
|
|
{
|
|
externcmd_substitute_arg(cmd, "[$]CHILDREN", child_nodes(m_servers, ptr).c_str());
|
|
}
|
|
|
|
if (externcmd_matches(cmd, "$EVENT"))
|
|
{
|
|
externcmd_substitute_arg(cmd, "[$]EVENT", mon_get_event_name(ptr));
|
|
}
|
|
|
|
char nodelist[PATH_MAX + MON_ARG_MAX + 1] = {'\0'};
|
|
|
|
if (externcmd_matches(cmd, "$CREDENTIALS"))
|
|
{
|
|
// We provide the credentials for _all_ servers.
|
|
append_node_names(nodelist, sizeof(nodelist), 0, CREDENTIALS_INCLUDE);
|
|
externcmd_substitute_arg(cmd, "[$]CREDENTIALS", nodelist);
|
|
}
|
|
|
|
if (externcmd_matches(cmd, "$NODELIST"))
|
|
{
|
|
append_node_names(nodelist, sizeof(nodelist), SERVER_RUNNING);
|
|
externcmd_substitute_arg(cmd, "[$]NODELIST", nodelist);
|
|
}
|
|
|
|
if (externcmd_matches(cmd, "$LIST"))
|
|
{
|
|
append_node_names(nodelist, sizeof(nodelist), 0);
|
|
externcmd_substitute_arg(cmd, "[$]LIST", nodelist);
|
|
}
|
|
|
|
if (externcmd_matches(cmd, "$MASTERLIST"))
|
|
{
|
|
append_node_names(nodelist, sizeof(nodelist), SERVER_MASTER);
|
|
externcmd_substitute_arg(cmd, "[$]MASTERLIST", nodelist);
|
|
}
|
|
|
|
if (externcmd_matches(cmd, "$SLAVELIST"))
|
|
{
|
|
append_node_names(nodelist, sizeof(nodelist), SERVER_SLAVE);
|
|
externcmd_substitute_arg(cmd, "[$]SLAVELIST", nodelist);
|
|
}
|
|
|
|
if (externcmd_matches(cmd, "$SYNCEDLIST"))
|
|
{
|
|
append_node_names(nodelist, sizeof(nodelist), SERVER_JOINED);
|
|
externcmd_substitute_arg(cmd, "[$]SYNCEDLIST", nodelist);
|
|
}
|
|
|
|
int rv = externcmd_execute(cmd);
|
|
|
|
if (rv)
|
|
{
|
|
if (rv == -1)
|
|
{
|
|
// Internal error
|
|
MXS_ERROR("Failed to execute script '%s' on server state change event '%s'",
|
|
cmd->argv[0],
|
|
mon_get_event_name(ptr));
|
|
}
|
|
else
|
|
{
|
|
// Script returned a non-zero value
|
|
MXS_ERROR("Script '%s' returned %d on event '%s'",
|
|
cmd->argv[0],
|
|
rv,
|
|
mon_get_event_name(ptr));
|
|
}
|
|
}
|
|
else
|
|
{
|
|
mxb_assert(cmd->argv != NULL && cmd->argv[0] != NULL);
|
|
// Construct a string with the script + arguments
|
|
char* scriptStr = NULL;
|
|
int totalStrLen = 0;
|
|
bool memError = false;
|
|
for (int i = 0; cmd->argv[i]; i++)
|
|
{
|
|
totalStrLen += strlen(cmd->argv[i]) + 1; // +1 for space and one \0
|
|
}
|
|
int spaceRemaining = totalStrLen;
|
|
if ((scriptStr = (char*)MXS_CALLOC(totalStrLen, sizeof(char))) != NULL)
|
|
{
|
|
char* currentPos = scriptStr;
|
|
// The script name should not begin with a space
|
|
int len = snprintf(currentPos, spaceRemaining, "%s", cmd->argv[0]);
|
|
currentPos += len;
|
|
spaceRemaining -= len;
|
|
|
|
for (int i = 1; cmd->argv[i]; i++)
|
|
{
|
|
if ((cmd->argv[i])[0] == '\0')
|
|
{
|
|
continue; // Empty argument, print nothing
|
|
}
|
|
len = snprintf(currentPos, spaceRemaining, " %s", cmd->argv[i]);
|
|
currentPos += len;
|
|
spaceRemaining -= len;
|
|
}
|
|
mxb_assert(spaceRemaining > 0);
|
|
*currentPos = '\0';
|
|
}
|
|
else
|
|
{
|
|
memError = true;
|
|
scriptStr = cmd->argv[0]; // print at least something
|
|
}
|
|
|
|
MXS_NOTICE("Executed monitor script '%s' on event '%s'",
|
|
scriptStr,
|
|
mon_get_event_name(ptr));
|
|
|
|
if (!memError)
|
|
{
|
|
MXS_FREE(scriptStr);
|
|
}
|
|
}
|
|
|
|
return rv;
|
|
}
|
|
|
|
int Monitor::launch_script(MXS_MONITORED_SERVER* ptr)
|
|
{
|
|
const char* script = m_settings.script.c_str();
|
|
char arg[strlen(script) + 1];
|
|
strcpy(arg, script);
|
|
|
|
EXTERNCMD* cmd = externcmd_allocate(arg, m_settings.script_timeout);
|
|
|
|
if (cmd == NULL)
|
|
{
|
|
MXS_ERROR("Failed to initialize script '%s'. See previous errors for the "
|
|
"cause of this failure.",
|
|
script);
|
|
return -1;
|
|
}
|
|
|
|
int rv = launch_command(ptr, cmd);
|
|
|
|
externcmd_free(cmd);
|
|
|
|
return rv;
|
|
}
|
|
|
|
mxs_connect_result_t mon_ping_or_connect_to_db(const MXS_MONITORED_SERVER::ConnectionSettings& sett,
|
|
SERVER& server, MYSQL** ppConn)
|
|
{
|
|
mxb_assert(ppConn);
|
|
auto pConn = *ppConn;
|
|
if (pConn)
|
|
{
|
|
/** Return if the connection is OK */
|
|
if (mysql_ping(pConn) == 0)
|
|
{
|
|
return MONITOR_CONN_EXISTING_OK;
|
|
}
|
|
/** Otherwise close the handle. */
|
|
mysql_close(pConn);
|
|
}
|
|
|
|
mxs_connect_result_t conn_result = MONITOR_CONN_REFUSED;
|
|
if ((pConn = mysql_init(NULL)) != nullptr)
|
|
{
|
|
string uname = sett.username;
|
|
string passwd = sett.password;
|
|
const Server& srv = static_cast<const Server&>(server); // Clean this up later.
|
|
string server_specific_monuser = srv.monitor_user();
|
|
if (!server_specific_monuser.empty())
|
|
{
|
|
uname = server_specific_monuser;
|
|
passwd = srv.monitor_password();
|
|
}
|
|
char* dpwd = decrypt_password(passwd.c_str());
|
|
|
|
mysql_optionsv(pConn, MYSQL_OPT_CONNECT_TIMEOUT, &sett.connect_timeout);
|
|
mysql_optionsv(pConn, MYSQL_OPT_READ_TIMEOUT, &sett.read_timeout);
|
|
mysql_optionsv(pConn, MYSQL_OPT_WRITE_TIMEOUT, &sett.write_timeout);
|
|
mysql_optionsv(pConn, MYSQL_PLUGIN_DIR, get_connector_plugindir());
|
|
|
|
time_t start = 0;
|
|
time_t end = 0;
|
|
for (int i = 0; i < sett.connect_attempts; i++)
|
|
{
|
|
start = time(NULL);
|
|
bool result = (mxs_mysql_real_connect(pConn, &server, uname.c_str(), dpwd) != NULL);
|
|
end = time(NULL);
|
|
|
|
if (result)
|
|
{
|
|
conn_result = MONITOR_CONN_NEWCONN_OK;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (conn_result == MONITOR_CONN_REFUSED && difftime(end, start) >= sett.connect_timeout)
|
|
{
|
|
conn_result = MONITOR_CONN_TIMEOUT;
|
|
}
|
|
MXS_FREE(dpwd);
|
|
}
|
|
|
|
*ppConn = pConn;
|
|
return conn_result;
|
|
}
|
|
|
|
mxs_connect_result_t MXS_MONITORED_SERVER::ping_or_connect(const ConnectionSettings& settings)
|
|
{
|
|
return mon_ping_or_connect_to_db(settings, *server, &con);
|
|
}
|
|
|
|
/**
|
|
* Is the return value one of the 'OK' values.
|
|
*
|
|
* @param connect_result Return value of mon_ping_or_connect_to_db
|
|
* @return True of connection is ok
|
|
*/
|
|
bool mon_connection_is_ok(mxs_connect_result_t connect_result)
|
|
{
|
|
return connect_result == MONITOR_CONN_EXISTING_OK || connect_result == MONITOR_CONN_NEWCONN_OK;
|
|
}
|
|
|
|
/**
|
|
* Log an error about the failure to connect to a backend server and why it happened.
|
|
*
|
|
* @param database Backend database
|
|
* @param rval Return value of mon_ping_or_connect_to_db
|
|
*/
|
|
void mon_log_connect_error(MXS_MONITORED_SERVER* database, mxs_connect_result_t rval)
|
|
{
|
|
mxb_assert(!mon_connection_is_ok(rval) && database);
|
|
const char TIMED_OUT[] = "Monitor timed out when connecting to server %s[%s:%d] : '%s'";
|
|
const char REFUSED[] = "Monitor was unable to connect to server %s[%s:%d] : '%s'";
|
|
auto srv = database->server;
|
|
MXS_ERROR(rval == MONITOR_CONN_TIMEOUT ? TIMED_OUT : REFUSED,
|
|
srv->name(),
|
|
srv->address,
|
|
srv->port,
|
|
mysql_error(database->con));
|
|
}
|
|
|
|
static void mon_log_state_change(MXS_MONITORED_SERVER* ptr)
|
|
{
|
|
string prev = SERVER::status_to_string(ptr->mon_prev_status);
|
|
string next = ptr->server->status_string();
|
|
MXS_NOTICE("Server changed state: %s[%s:%u]: %s. [%s] -> [%s]",
|
|
ptr->server->name(), ptr->server->address, ptr->server->port,
|
|
mon_get_event_name(ptr),
|
|
prev.c_str(), next.c_str());
|
|
}
|
|
|
|
Monitor* monitor_server_in_use(const SERVER* server)
|
|
{
|
|
Monitor* rval = nullptr;
|
|
this_unit.foreach_monitor([&rval, server](Monitor* monitor) {
|
|
Guard guard(monitor->m_lock);
|
|
if (monitor->m_active)
|
|
{
|
|
for (MXS_MONITORED_SERVER* db : monitor->m_servers)
|
|
{
|
|
if (db->server == server)
|
|
{
|
|
rval = monitor;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
return (rval == nullptr);
|
|
});
|
|
return rval;
|
|
}
|
|
|
|
static bool create_monitor_config(const Monitor* monitor, const char* filename)
|
|
{
|
|
int file = open(filename, O_EXCL | O_CREAT | O_WRONLY, S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH);
|
|
|
|
if (file == -1)
|
|
{
|
|
MXS_ERROR("Failed to open file '%s' when serializing monitor '%s': %d, %s",
|
|
filename,
|
|
monitor->m_name,
|
|
errno,
|
|
mxs_strerror(errno));
|
|
return false;
|
|
}
|
|
|
|
{
|
|
Guard guard(monitor->m_lock);
|
|
dprintf(file, "[%s]\n", monitor->m_name);
|
|
dprintf(file, "%s=monitor\n", CN_TYPE);
|
|
|
|
if (!monitor->m_servers.empty())
|
|
{
|
|
dprintf(file, "%s=", CN_SERVERS);
|
|
for (MXS_MONITORED_SERVER* db : monitor->m_servers)
|
|
{
|
|
if (db != monitor->m_servers[0])
|
|
{
|
|
dprintf(file, ",");
|
|
}
|
|
dprintf(file, "%s", db->server->name());
|
|
}
|
|
dprintf(file, "\n");
|
|
}
|
|
|
|
const MXS_MODULE* mod = get_module(monitor->m_module.c_str(), NULL);
|
|
mxb_assert(mod);
|
|
|
|
dump_param_list(file,
|
|
monitor->parameters,
|
|
{CN_TYPE, CN_SERVERS},
|
|
config_monitor_params,
|
|
mod->parameters);
|
|
}
|
|
|
|
close(file);
|
|
return true;
|
|
}
|
|
|
|
bool monitor_serialize(const Monitor* monitor)
|
|
{
|
|
bool rval = false;
|
|
char filename[PATH_MAX];
|
|
snprintf(filename,
|
|
sizeof(filename),
|
|
"%s/%s.cnf.tmp",
|
|
get_config_persistdir(),
|
|
monitor->m_name);
|
|
|
|
if (unlink(filename) == -1 && errno != ENOENT)
|
|
{
|
|
MXS_ERROR("Failed to remove temporary monitor configuration at '%s': %d, %s",
|
|
filename,
|
|
errno,
|
|
mxs_strerror(errno));
|
|
}
|
|
else if (create_monitor_config(monitor, filename))
|
|
{
|
|
char final_filename[PATH_MAX];
|
|
strcpy(final_filename, filename);
|
|
|
|
char* dot = strrchr(final_filename, '.');
|
|
mxb_assert(dot);
|
|
*dot = '\0';
|
|
|
|
if (rename(filename, final_filename) == 0)
|
|
{
|
|
rval = true;
|
|
}
|
|
else
|
|
{
|
|
MXS_ERROR("Failed to rename temporary monitor configuration at '%s': %d, %s",
|
|
filename,
|
|
errno,
|
|
mxs_strerror(errno));
|
|
}
|
|
}
|
|
|
|
return rval;
|
|
}
|
|
|
|
void mon_hangup_failed_servers(Monitor* monitor)
|
|
{
|
|
for (MXS_MONITORED_SERVER* ptr : monitor->m_servers)
|
|
{
|
|
if (mon_status_changed(ptr) && (!(ptr->server->is_usable()) || !(ptr->server->is_in_cluster())))
|
|
{
|
|
dcb_hangup_foreach(ptr->server);
|
|
}
|
|
}
|
|
}
|
|
|
|
void mon_report_query_error(MXS_MONITORED_SERVER* db)
|
|
{
|
|
MXS_ERROR("Failed to execute query on server '%s' ([%s]:%d): %s",
|
|
db->server->name(),
|
|
db->server->address,
|
|
db->server->port,
|
|
mysql_error(db->con));
|
|
}
|
|
|
|
/**
|
|
* Check if admin is requesting setting or clearing maintenance status on the server and act accordingly.
|
|
* Should be called at the beginning of a monitor loop.
|
|
*
|
|
* @param monitor The target monitor
|
|
*/
|
|
void monitor_check_maintenance_requests(Monitor* monitor)
|
|
{
|
|
/* In theory, the admin may be modifying the server maintenance status during this function. The overall
|
|
* maintenance flag should be read-written atomically to prevent missing a value. */
|
|
int flags_changed = atomic_exchange_int(&monitor->check_status_flag, Monitor::STATUS_FLAG_NOCHECK);
|
|
if (flags_changed != Monitor::STATUS_FLAG_NOCHECK)
|
|
{
|
|
for (auto ptr : monitor->m_servers)
|
|
{
|
|
// The only server status bit the admin may change is the [Maintenance] bit.
|
|
int admin_msg = atomic_exchange_int(&ptr->status_request,
|
|
MXS_MONITORED_SERVER::NO_CHANGE);
|
|
|
|
switch (admin_msg)
|
|
{
|
|
case MXS_MONITORED_SERVER::MAINT_ON:
|
|
// TODO: Change to writing MONITORED_SERVER->pending status instead once cleanup done.
|
|
ptr->server->set_status(SERVER_MAINT);
|
|
break;
|
|
|
|
case MXS_MONITORED_SERVER::MAINT_OFF:
|
|
ptr->server->clear_status(SERVER_MAINT);
|
|
break;
|
|
|
|
case MXS_MONITORED_SERVER::BEING_DRAINED_ON:
|
|
ptr->server->set_status(SERVER_BEING_DRAINED);
|
|
break;
|
|
|
|
case MXS_MONITORED_SERVER::BEING_DRAINED_OFF:
|
|
ptr->server->clear_status(SERVER_BEING_DRAINED);
|
|
break;
|
|
|
|
case MXS_MONITORED_SERVER::NO_CHANGE:
|
|
break;
|
|
|
|
default:
|
|
mxb_assert(!true);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
void Monitor::detect_handle_state_changes()
|
|
{
|
|
bool master_down = false;
|
|
bool master_up = false;
|
|
|
|
for (MXS_MONITORED_SERVER* ptr : m_servers)
|
|
{
|
|
if (mon_status_changed(ptr))
|
|
{
|
|
/**
|
|
* The last executed event will be needed if a passive MaxScale is
|
|
* promoted to an active one and the last event that occurred on
|
|
* a server was a master_down event.
|
|
*
|
|
* In this case, a failover script should be called if no master_up
|
|
* or new_master events are triggered within a pre-defined time limit.
|
|
*/
|
|
mxs_monitor_event_t event = mon_get_event_type(ptr);
|
|
ptr->server->last_event = event;
|
|
ptr->server->triggered_at = mxs_clock();
|
|
mon_log_state_change(ptr);
|
|
|
|
if (event == MASTER_DOWN_EVENT)
|
|
{
|
|
master_down = true;
|
|
}
|
|
else if (event == MASTER_UP_EVENT || event == NEW_MASTER_EVENT)
|
|
{
|
|
master_up = true;
|
|
}
|
|
|
|
if (!m_settings.script.empty() && (event & m_settings.events))
|
|
{
|
|
launch_script(ptr);
|
|
}
|
|
}
|
|
}
|
|
|
|
if (master_down && master_up)
|
|
{
|
|
MXS_NOTICE("Master switch detected: lost a master and gained a new one");
|
|
}
|
|
}
|
|
|
|
static const char* monitor_state_to_string(monitor_state_t state)
|
|
{
|
|
switch (state)
|
|
{
|
|
case MONITOR_STATE_RUNNING:
|
|
return "Running";
|
|
|
|
case MONITOR_STATE_STOPPING:
|
|
return "Stopping";
|
|
|
|
case MONITOR_STATE_STOPPED:
|
|
return "Stopped";
|
|
|
|
default:
|
|
mxb_assert(false);
|
|
return "Unknown";
|
|
}
|
|
}
|
|
|
|
json_t* monitor_parameters_to_json(const Monitor* monitor)
|
|
{
|
|
json_t* rval = json_object();
|
|
const MXS_MODULE* mod = get_module(monitor->m_module.c_str(), MODULE_MONITOR);
|
|
config_add_module_params_json(monitor->parameters,
|
|
{CN_TYPE, CN_MODULE, CN_SERVERS},
|
|
config_monitor_params,
|
|
mod->parameters,
|
|
rval);
|
|
return rval;
|
|
}
|
|
|
|
json_t* monitor_json_data(const Monitor* monitor, const char* host)
|
|
{
|
|
json_t* rval = json_object();
|
|
json_t* attr = json_object();
|
|
json_t* rel = json_object();
|
|
|
|
{
|
|
Guard guard(monitor->m_lock);
|
|
json_object_set_new(rval, CN_ID, json_string(monitor->m_name));
|
|
json_object_set_new(rval, CN_TYPE, json_string(CN_MONITORS));
|
|
|
|
json_object_set_new(attr, CN_MODULE, json_string(monitor->m_module.c_str()));
|
|
json_object_set_new(attr, CN_STATE, json_string(monitor_state_to_string(monitor->m_state)));
|
|
json_object_set_new(attr, CN_TICKS, json_integer(monitor->m_ticks));
|
|
|
|
/** Monitor parameters */
|
|
json_object_set_new(attr, CN_PARAMETERS, monitor_parameters_to_json(monitor));
|
|
|
|
if (monitor->m_state == MONITOR_STATE_RUNNING)
|
|
{
|
|
json_t* diag = monitor->diagnostics_json();
|
|
if (diag)
|
|
{
|
|
json_object_set_new(attr, CN_MONITOR_DIAGNOSTICS, diag);
|
|
}
|
|
}
|
|
|
|
if (!monitor->m_servers.empty())
|
|
{
|
|
json_t* mon_rel = mxs_json_relationship(host, MXS_JSON_API_SERVERS);
|
|
for (MXS_MONITORED_SERVER* db : monitor->m_servers)
|
|
{
|
|
mxs_json_add_relation(mon_rel, db->server->name(), CN_SERVERS);
|
|
}
|
|
json_object_set_new(rel, CN_SERVERS, mon_rel);
|
|
}
|
|
}
|
|
|
|
json_object_set_new(rval, CN_RELATIONSHIPS, rel);
|
|
json_object_set_new(rval, CN_ATTRIBUTES, attr);
|
|
json_object_set_new(rval, CN_LINKS, mxs_json_self_link(host, CN_MONITORS, monitor->m_name));
|
|
return rval;
|
|
}
|
|
|
|
json_t* monitor_to_json(const Monitor* monitor, const char* host)
|
|
{
|
|
string self = MXS_JSON_API_MONITORS;
|
|
self += monitor->m_name;
|
|
return mxs_json_resource(host, self.c_str(), monitor_json_data(monitor, host));
|
|
}
|
|
|
|
json_t* monitor_list_to_json(const char* host)
|
|
{
|
|
json_t* rval = json_array();
|
|
this_unit.foreach_monitor([rval, host](Monitor* mon) {
|
|
if (mon->m_active)
|
|
{
|
|
json_t* json = monitor_json_data(mon, host);
|
|
|
|
if (json)
|
|
{
|
|
json_array_append_new(rval, json);
|
|
}
|
|
}
|
|
return true;
|
|
});
|
|
|
|
return mxs_json_resource(host, MXS_JSON_API_MONITORS, rval);
|
|
}
|
|
|
|
json_t* monitor_relations_to_server(const SERVER* server, const char* host)
|
|
{
|
|
std::vector<std::string> names;
|
|
this_unit.foreach_monitor([&names, server](Monitor* mon) {
|
|
Guard guard(mon->m_lock);
|
|
if (mon->m_active)
|
|
{
|
|
for (MXS_MONITORED_SERVER* db : mon->m_servers)
|
|
{
|
|
if (db->server == server)
|
|
{
|
|
names.push_back(mon->m_name);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
return true;
|
|
});
|
|
|
|
json_t* rel = NULL;
|
|
if (!names.empty())
|
|
{
|
|
rel = mxs_json_relationship(host, MXS_JSON_API_MONITORS);
|
|
|
|
for (std::vector<std::string>::iterator it = names.begin();
|
|
it != names.end(); it++)
|
|
{
|
|
mxs_json_add_relation(rel, it->c_str(), CN_MONITORS);
|
|
}
|
|
}
|
|
|
|
return rel;
|
|
}
|
|
|
|
static const char journal_name[] = "monitor.dat";
|
|
static const char journal_template[] = "%s/%s/%s";
|
|
|
|
/**
|
|
* @brief Remove .tmp suffix and rename file
|
|
*
|
|
* @param src File to rename
|
|
* @return True if file was successfully renamed
|
|
*/
|
|
static bool rename_tmp_file(Monitor* monitor, const char* src)
|
|
{
|
|
bool rval = true;
|
|
char dest[PATH_MAX + 1];
|
|
snprintf(dest, sizeof(dest), journal_template, get_datadir(), monitor->m_name, journal_name);
|
|
|
|
if (rename(src, dest) == -1)
|
|
{
|
|
rval = false;
|
|
MXS_ERROR("Failed to rename journal file '%s' to '%s': %d, %s",
|
|
src,
|
|
dest,
|
|
errno,
|
|
mxs_strerror(errno));
|
|
}
|
|
|
|
return rval;
|
|
}
|
|
|
|
/**
|
|
* @brief Open temporary file
|
|
*
|
|
* @param monitor Monitor
|
|
* @param path Output where the path is stored
|
|
* @return Opened file or NULL on error
|
|
*/
|
|
static FILE* open_tmp_file(Monitor* monitor, char* path)
|
|
{
|
|
int nbytes = snprintf(path, PATH_MAX, journal_template, get_datadir(), monitor->m_name, "");
|
|
int max_bytes = PATH_MAX - (int)sizeof(journal_name);
|
|
FILE* rval = NULL;
|
|
|
|
if (nbytes < max_bytes && mxs_mkdir_all(path, 0744))
|
|
{
|
|
strcat(path, journal_name);
|
|
strcat(path, "XXXXXX");
|
|
int fd = mkstemp(path);
|
|
|
|
if (fd == -1)
|
|
{
|
|
MXS_ERROR("Failed to open file '%s': %d, %s", path, errno, mxs_strerror(errno));
|
|
}
|
|
else
|
|
{
|
|
rval = fdopen(fd, "w");
|
|
}
|
|
}
|
|
else
|
|
{
|
|
MXS_ERROR("Path is too long: %d characters exceeds the maximum path "
|
|
"length of %d bytes",
|
|
nbytes,
|
|
max_bytes);
|
|
}
|
|
|
|
return rval;
|
|
}
|
|
|
|
/**
|
|
* @brief Store server data to in-memory buffer
|
|
*
|
|
* @param monitor Monitor
|
|
* @param data Pointer to in-memory buffer used for storage, should be at least
|
|
* PATH_MAX bytes long
|
|
* @param size Size of @c data
|
|
*/
|
|
static void store_data(Monitor* monitor, MXS_MONITORED_SERVER* master, uint8_t* data, uint32_t size)
|
|
{
|
|
uint8_t* ptr = data;
|
|
|
|
/** Store the data length */
|
|
mxb_assert(sizeof(size) == MMB_LEN_BYTES);
|
|
ptr = mxs_set_byte4(ptr, size);
|
|
|
|
/** Then the schema version */
|
|
*ptr++ = MMB_SCHEMA_VERSION;
|
|
|
|
/** Store the states of all servers */
|
|
for (MXS_MONITORED_SERVER* db : monitor->m_servers)
|
|
{
|
|
*ptr++ = (char)SVT_SERVER; // Value type
|
|
memcpy(ptr, db->server->name(), strlen(db->server->name()));// Name of the server
|
|
ptr += strlen(db->server->name());
|
|
*ptr++ = '\0'; // Null-terminate the string
|
|
|
|
auto status = db->server->status;
|
|
static_assert(sizeof(status) == MMB_LEN_SERVER_STATUS,
|
|
"Status size should be MMB_LEN_SERVER_STATUS bytes");
|
|
ptr = maxscale::set_byteN(ptr, status, MMB_LEN_SERVER_STATUS);
|
|
}
|
|
|
|
/** Store the current root master if we have one */
|
|
if (master)
|
|
{
|
|
*ptr++ = (char)SVT_MASTER;
|
|
memcpy(ptr, master->server->name(), strlen(master->server->name()));
|
|
ptr += strlen(master->server->name());
|
|
*ptr++ = '\0'; // Null-terminate the string
|
|
}
|
|
|
|
/** Calculate the CRC32 for the complete payload minus the CRC32 bytes */
|
|
uint32_t crc = crc32(0L, NULL, 0);
|
|
crc = crc32(crc, (uint8_t*)data + MMB_LEN_BYTES, size - MMB_LEN_CRC32);
|
|
mxb_assert(sizeof(crc) == MMB_LEN_CRC32);
|
|
|
|
ptr = mxs_set_byte4(ptr, crc);
|
|
mxb_assert(ptr - data == size + MMB_LEN_BYTES);
|
|
}
|
|
|
|
static int get_data_file_path(Monitor* monitor, char* path)
|
|
{
|
|
int rv = snprintf(path, PATH_MAX, journal_template, get_datadir(), monitor->m_name, journal_name);
|
|
return rv;
|
|
}
|
|
|
|
/**
|
|
* @brief Open stored journal file
|
|
*
|
|
* @param monitor Monitor to reload
|
|
* @param path Output where path is stored
|
|
* @return Opened file or NULL on error
|
|
*/
|
|
static FILE* open_data_file(Monitor* monitor, char* path)
|
|
{
|
|
FILE* rval = NULL;
|
|
int nbytes = get_data_file_path(monitor, path);
|
|
|
|
if (nbytes < PATH_MAX)
|
|
{
|
|
if ((rval = fopen(path, "rb")) == NULL && errno != ENOENT)
|
|
{
|
|
MXS_ERROR("Failed to open journal file: %d, %s", errno, mxs_strerror(errno));
|
|
}
|
|
}
|
|
else
|
|
{
|
|
MXS_ERROR("Path is too long: %d characters exceeds the maximum path "
|
|
"length of %d bytes",
|
|
nbytes,
|
|
PATH_MAX);
|
|
}
|
|
|
|
return rval;
|
|
}
|
|
|
|
/**
|
|
* Check that memory area contains a null terminator
|
|
*/
|
|
static bool has_null_terminator(const char* data, const char* end)
|
|
{
|
|
while (data < end)
|
|
{
|
|
if (*data == '\0')
|
|
{
|
|
return true;
|
|
}
|
|
data++;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
/**
|
|
* Process a generic server
|
|
*/
|
|
static const char* process_server(Monitor* monitor, const char* data, const char* end)
|
|
{
|
|
for (MXS_MONITORED_SERVER* db : monitor->m_servers)
|
|
{
|
|
if (strcmp(db->server->name(), data) == 0)
|
|
{
|
|
const unsigned char* sptr = (unsigned char*)strchr(data, '\0');
|
|
mxb_assert(sptr);
|
|
sptr++;
|
|
|
|
uint64_t status = maxscale::get_byteN(sptr, MMB_LEN_SERVER_STATUS);
|
|
db->mon_prev_status = status;
|
|
db->server->set_status(status);
|
|
monitor_set_pending_status(db, status);
|
|
break;
|
|
}
|
|
}
|
|
|
|
data += strlen(data) + 1 + MMB_LEN_SERVER_STATUS;
|
|
|
|
return data;
|
|
}
|
|
|
|
/**
|
|
* Process a master
|
|
*/
|
|
static const char* process_master(Monitor* monitor,
|
|
MXS_MONITORED_SERVER** master,
|
|
const char* data,
|
|
const char* end)
|
|
{
|
|
if (master)
|
|
{
|
|
for (MXS_MONITORED_SERVER* db : monitor->m_servers)
|
|
{
|
|
if (strcmp(db->server->name(), data) == 0)
|
|
{
|
|
*master = db;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
data += strlen(data) + 1;
|
|
|
|
return data;
|
|
}
|
|
|
|
/**
|
|
* Check that the calculated CRC32 matches the one stored on disk
|
|
*/
|
|
static bool check_crc32(const uint8_t* data, uint32_t size, const uint8_t* crc_ptr)
|
|
{
|
|
uint32_t crc = mxs_get_byte4(crc_ptr);
|
|
uint32_t calculated_crc = crc32(0L, NULL, 0);
|
|
calculated_crc = crc32(calculated_crc, data, size);
|
|
return calculated_crc == crc;
|
|
}
|
|
|
|
/**
|
|
* Process the stored journal data
|
|
*/
|
|
static bool process_data_file(Monitor* monitor,
|
|
MXS_MONITORED_SERVER** master,
|
|
const char* data,
|
|
const char* crc_ptr)
|
|
{
|
|
const char* ptr = data;
|
|
MXB_AT_DEBUG(const char* prevptr = ptr);
|
|
|
|
while (ptr < crc_ptr)
|
|
{
|
|
/** All values contain a null terminated string */
|
|
if (!has_null_terminator(ptr, crc_ptr))
|
|
{
|
|
MXS_ERROR("Possible corrupted journal file (no null terminator found). Ignoring.");
|
|
return false;
|
|
}
|
|
|
|
stored_value_type type = (stored_value_type)ptr[0];
|
|
ptr += MMB_LEN_VALUE_TYPE;
|
|
|
|
switch (type)
|
|
{
|
|
case SVT_SERVER:
|
|
ptr = process_server(monitor, ptr, crc_ptr);
|
|
break;
|
|
|
|
case SVT_MASTER:
|
|
ptr = process_master(monitor, master, ptr, crc_ptr);
|
|
break;
|
|
|
|
default:
|
|
MXS_ERROR("Possible corrupted journal file (unknown stored value). Ignoring.");
|
|
return false;
|
|
}
|
|
mxb_assert(prevptr != ptr);
|
|
MXB_AT_DEBUG(prevptr = ptr);
|
|
}
|
|
|
|
mxb_assert(ptr == crc_ptr);
|
|
return true;
|
|
}
|
|
|
|
void store_server_journal(Monitor* monitor, MXS_MONITORED_SERVER* master)
|
|
{
|
|
/** Calculate how much memory we need to allocate */
|
|
uint32_t size = MMB_LEN_SCHEMA_VERSION + MMB_LEN_CRC32;
|
|
|
|
for (MXS_MONITORED_SERVER* db : monitor->m_servers)
|
|
{
|
|
/** Each server is stored as a type byte and a null-terminated string
|
|
* followed by eight byte server status. */
|
|
size += MMB_LEN_VALUE_TYPE + strlen(db->server->name()) + 1 + MMB_LEN_SERVER_STATUS;
|
|
}
|
|
|
|
if (master)
|
|
{
|
|
/** The master server name is stored as a null terminated string */
|
|
size += MMB_LEN_VALUE_TYPE + strlen(master->server->name()) + 1;
|
|
}
|
|
|
|
/** 4 bytes for file length, 1 byte for schema version and 4 bytes for CRC32 */
|
|
uint32_t buffer_size = size + MMB_LEN_BYTES;
|
|
uint8_t* data = (uint8_t*)MXS_MALLOC(buffer_size);
|
|
char path[PATH_MAX + 1];
|
|
|
|
if (data)
|
|
{
|
|
/** Store the data in memory first and compare the current hash to
|
|
* the hash of the last stored journal. This isn't a fool-proof
|
|
* method of detecting changes but any failures are mainly of
|
|
* theoretical nature. */
|
|
store_data(monitor, master, data, size);
|
|
uint8_t hash[SHA_DIGEST_LENGTH];
|
|
SHA1(data, size, hash);
|
|
|
|
if (memcmp(monitor->m_journal_hash, hash, sizeof(hash)) != 0)
|
|
{
|
|
FILE* file = open_tmp_file(monitor, path);
|
|
|
|
if (file)
|
|
{
|
|
/** Write the data to a temp file and rename it to the final name */
|
|
if (fwrite(data, 1, buffer_size, file) == buffer_size && fflush(file) == 0)
|
|
{
|
|
if (!rename_tmp_file(monitor, path))
|
|
{
|
|
unlink(path);
|
|
}
|
|
else
|
|
{
|
|
memcpy(monitor->m_journal_hash, hash, sizeof(hash));
|
|
}
|
|
}
|
|
else
|
|
{
|
|
MXS_ERROR("Failed to write journal data to disk: %d, %s",
|
|
errno,
|
|
mxs_strerror(errno));
|
|
}
|
|
fclose(file);
|
|
}
|
|
}
|
|
}
|
|
MXS_FREE(data);
|
|
}
|
|
|
|
void load_server_journal(Monitor* monitor, MXS_MONITORED_SERVER** master)
|
|
{
|
|
char path[PATH_MAX];
|
|
FILE* file = open_data_file(monitor, path);
|
|
|
|
if (file)
|
|
{
|
|
uint32_t size = 0;
|
|
size_t bytes = fread(&size, 1, MMB_LEN_BYTES, file);
|
|
mxb_assert(sizeof(size) == MMB_LEN_BYTES);
|
|
|
|
if (bytes == MMB_LEN_BYTES)
|
|
{
|
|
/** Payload contents:
|
|
*
|
|
* - One byte of schema version
|
|
* - `size - 5` bytes of data
|
|
* - Trailing 4 bytes of CRC32
|
|
*/
|
|
char* data = (char*)MXS_MALLOC(size);
|
|
|
|
if (data && (bytes = fread(data, 1, size, file)) == size)
|
|
{
|
|
if (*data == MMB_SCHEMA_VERSION)
|
|
{
|
|
if (check_crc32((uint8_t*)data,
|
|
size - MMB_LEN_CRC32,
|
|
(uint8_t*)data + size - MMB_LEN_CRC32))
|
|
{
|
|
if (process_data_file(monitor,
|
|
master,
|
|
data + MMB_LEN_SCHEMA_VERSION,
|
|
data + size - MMB_LEN_CRC32))
|
|
{
|
|
MXS_NOTICE("Loaded server states from journal file: %s", path);
|
|
}
|
|
}
|
|
else
|
|
{
|
|
MXS_ERROR("CRC32 mismatch in journal file. Ignoring.");
|
|
}
|
|
}
|
|
else
|
|
{
|
|
MXS_ERROR("Unknown journal schema version: %d", (int)*data);
|
|
}
|
|
}
|
|
else if (data)
|
|
{
|
|
if (ferror(file))
|
|
{
|
|
MXS_ERROR("Failed to read journal file: %d, %s", errno, mxs_strerror(errno));
|
|
}
|
|
else
|
|
{
|
|
MXS_ERROR("Failed to read journal file: Expected %u bytes, "
|
|
"read %lu bytes.",
|
|
size,
|
|
bytes);
|
|
}
|
|
}
|
|
MXS_FREE(data);
|
|
}
|
|
else
|
|
{
|
|
if (ferror(file))
|
|
{
|
|
MXS_ERROR("Failed to read journal file length: %d, %s",
|
|
errno,
|
|
mxs_strerror(errno));
|
|
}
|
|
else
|
|
{
|
|
MXS_ERROR("Failed to read journal file length: Expected %d bytes, "
|
|
"read %lu bytes.",
|
|
MMB_LEN_BYTES,
|
|
bytes);
|
|
}
|
|
}
|
|
|
|
fclose(file);
|
|
}
|
|
}
|
|
|
|
static void remove_server_journal(Monitor* monitor)
|
|
{
|
|
char path[PATH_MAX];
|
|
|
|
if (get_data_file_path(monitor, path) < PATH_MAX)
|
|
{
|
|
unlink(path);
|
|
}
|
|
else
|
|
{
|
|
MXS_ERROR("Path to monitor journal directory is too long.");
|
|
}
|
|
}
|
|
|
|
bool Monitor::journal_is_stale()
|
|
{
|
|
bool is_stale = true;
|
|
char path[PATH_MAX];
|
|
auto max_age = m_settings.journal_max_age;
|
|
if (get_data_file_path(this, path) < PATH_MAX)
|
|
{
|
|
struct stat st;
|
|
|
|
if (stat(path, &st) == 0)
|
|
{
|
|
time_t tdiff = time(NULL) - st.st_mtim.tv_sec;
|
|
|
|
if (tdiff >= max_age)
|
|
{
|
|
MXS_WARNING("Journal file was created %ld seconds ago. Maximum journal "
|
|
"age is %ld seconds.",
|
|
tdiff,
|
|
max_age);
|
|
}
|
|
else
|
|
{
|
|
is_stale = false;
|
|
}
|
|
}
|
|
else if (errno != ENOENT)
|
|
{
|
|
MXS_ERROR("Failed to inspect journal file: %d, %s", errno, mxs_strerror(errno));
|
|
}
|
|
}
|
|
else
|
|
{
|
|
MXS_ERROR("Path to monitor journal directory is too long.");
|
|
}
|
|
|
|
return is_stale;
|
|
}
|
|
|
|
MXS_MONITORED_SERVER* mon_get_monitored_server(const Monitor* mon, SERVER* search_server)
|
|
{
|
|
mxb_assert(mon && search_server);
|
|
for (MXS_MONITORED_SERVER* iter : mon->m_servers)
|
|
{
|
|
if (iter->server == search_server)
|
|
{
|
|
return iter;
|
|
}
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
std::vector<MXS_MONITORED_SERVER*> mon_config_get_servers(const MXS_CONFIG_PARAMETER* params,
|
|
const char* key, const Monitor* mon,
|
|
bool* error_out)
|
|
{
|
|
std::vector<MXS_MONITORED_SERVER*> monitored_array;
|
|
// Check that value exists.
|
|
if (!params->contains(key))
|
|
{
|
|
return monitored_array;
|
|
}
|
|
|
|
string name_error;
|
|
auto servers = config_get_server_list(params, key, &name_error);
|
|
if (!servers.empty())
|
|
{
|
|
// All servers in the array must be monitored by the given monitor.
|
|
for (auto elem : servers)
|
|
{
|
|
MXS_MONITORED_SERVER* mon_serv = mon_get_monitored_server(mon, elem);
|
|
if (mon_serv)
|
|
{
|
|
monitored_array.push_back(mon_serv);
|
|
}
|
|
else
|
|
{
|
|
MXS_ERROR("Server '%s' is not monitored by monitor '%s'.", elem->name(), mon->m_name);
|
|
*error_out = true;
|
|
}
|
|
}
|
|
|
|
if (monitored_array.size() < servers.size())
|
|
{
|
|
monitored_array.clear();
|
|
}
|
|
}
|
|
else
|
|
{
|
|
MXS_ERROR("Serverlist setting '%s' contains invalid server name '%s'.", key, name_error.c_str());
|
|
*error_out = true;
|
|
}
|
|
|
|
return monitored_array;
|
|
}
|
|
|
|
bool Monitor::set_disk_space_threshold(const string& dst_setting)
|
|
{
|
|
mxb_assert(m_state == MONITOR_STATE_STOPPED);
|
|
SERVER::DiskSpaceLimits new_dst;
|
|
bool rv = config_parse_disk_space_threshold(&new_dst, dst_setting.c_str());
|
|
if (rv)
|
|
{
|
|
m_settings.disk_space_limits = new_dst;
|
|
}
|
|
return rv;
|
|
}
|
|
|
|
namespace
|
|
{
|
|
|
|
const char ERR_CANNOT_MODIFY[] =
|
|
"The server is monitored, so only the maintenance status can be "
|
|
"set/cleared manually. Status was not modified.";
|
|
const char WRN_REQUEST_OVERWRITTEN[] =
|
|
"Previous maintenance request was not yet read by the monitor and was overwritten.";
|
|
}
|
|
|
|
bool Monitor::set_server_status(SERVER* srv, int bit, string* errmsg_out)
|
|
{
|
|
MXS_MONITORED_SERVER* msrv = mon_get_monitored_server(this, srv);
|
|
mxb_assert(msrv);
|
|
|
|
if (!msrv)
|
|
{
|
|
MXS_ERROR("Monitor %s requested to set status of server %s that it does not monitor.",
|
|
m_name, srv->address);
|
|
return false;
|
|
}
|
|
|
|
bool written = false;
|
|
|
|
if (m_state == MONITOR_STATE_RUNNING)
|
|
{
|
|
/* This server is monitored, in which case modifying any other status bit than Maintenance is
|
|
* disallowed. */
|
|
if (bit & ~(SERVER_MAINT | SERVER_BEING_DRAINED))
|
|
{
|
|
MXS_ERROR(ERR_CANNOT_MODIFY);
|
|
if (errmsg_out)
|
|
{
|
|
*errmsg_out = ERR_CANNOT_MODIFY;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
/* Maintenance and being-drained are set/cleared using a special variable which the
|
|
* monitor reads when starting the next update cycle. */
|
|
|
|
int request;
|
|
if (bit & SERVER_MAINT)
|
|
{
|
|
request = MXS_MONITORED_SERVER::MAINT_ON;
|
|
}
|
|
else
|
|
{
|
|
mxb_assert(bit & SERVER_BEING_DRAINED);
|
|
request = MXS_MONITORED_SERVER::BEING_DRAINED_ON;
|
|
}
|
|
|
|
int previous_request = atomic_exchange_int(&msrv->status_request, request);
|
|
written = true;
|
|
// Warn if the previous request hasn't been read.
|
|
if (previous_request != MXS_MONITORED_SERVER::NO_CHANGE)
|
|
{
|
|
MXS_WARNING(WRN_REQUEST_OVERWRITTEN);
|
|
}
|
|
// Also set a flag so the next loop happens sooner.
|
|
atomic_store_int(&this->check_status_flag, Monitor::STATUS_FLAG_CHECK);
|
|
}
|
|
}
|
|
else
|
|
{
|
|
/* The monitor is not running, the bit can be set directly */
|
|
srv->set_status(bit);
|
|
written = true;
|
|
}
|
|
|
|
return written;
|
|
}
|
|
|
|
bool Monitor::clear_server_status(SERVER* srv, int bit, string* errmsg_out)
|
|
{
|
|
MXS_MONITORED_SERVER* msrv = mon_get_monitored_server(this, srv);
|
|
mxb_assert(msrv);
|
|
|
|
if (!msrv)
|
|
{
|
|
MXS_ERROR("Monitor %s requested to clear status of server %s that it does not monitor.",
|
|
m_name, srv->address);
|
|
return false;
|
|
}
|
|
|
|
bool written = false;
|
|
|
|
if (m_state == MONITOR_STATE_RUNNING)
|
|
{
|
|
if (bit & ~(SERVER_MAINT | SERVER_BEING_DRAINED))
|
|
{
|
|
MXS_ERROR(ERR_CANNOT_MODIFY);
|
|
if (errmsg_out)
|
|
{
|
|
*errmsg_out = ERR_CANNOT_MODIFY;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
int request;
|
|
if (bit & SERVER_MAINT)
|
|
{
|
|
request = MXS_MONITORED_SERVER::MAINT_OFF;
|
|
}
|
|
else
|
|
{
|
|
mxb_assert(bit & SERVER_BEING_DRAINED);
|
|
request = MXS_MONITORED_SERVER::BEING_DRAINED_OFF;
|
|
}
|
|
|
|
int previous_request = atomic_exchange_int(&msrv->status_request, request);
|
|
written = true;
|
|
// Warn if the previous request hasn't been read.
|
|
if (previous_request != MXS_MONITORED_SERVER::NO_CHANGE)
|
|
{
|
|
MXS_WARNING(WRN_REQUEST_OVERWRITTEN);
|
|
}
|
|
// Also set a flag so the next loop happens sooner.
|
|
atomic_store_int(&this->check_status_flag, Monitor::STATUS_FLAG_CHECK);
|
|
}
|
|
}
|
|
else
|
|
{
|
|
/* The monitor is not running, the bit can be cleared directly */
|
|
srv->clear_status(bit);
|
|
written = true;
|
|
}
|
|
|
|
return written;
|
|
|
|
|
|
}
|
|
|
|
void monitor_debug_wait()
|
|
{
|
|
using namespace std::chrono;
|
|
std::map<Monitor*, uint64_t> ticks;
|
|
|
|
// Get tick values for all monitors
|
|
this_unit.foreach_monitor([&ticks](Monitor* mon) {
|
|
ticks[mon] = mxb::atomic::load(&mon->m_ticks);
|
|
return true;
|
|
});
|
|
|
|
// Wait for all running monitors to advance at least one tick.
|
|
this_unit.foreach_monitor([&ticks](Monitor* mon) {
|
|
if (mon->m_state == MONITOR_STATE_RUNNING)
|
|
{
|
|
auto start = steady_clock::now();
|
|
// A monitor may have been added in between the two foreach-calls (not if config changes are
|
|
// serialized). Check if entry exists.
|
|
if (ticks.count(mon) > 0)
|
|
{
|
|
auto tick = ticks[mon];
|
|
while (mxb::atomic::load(&mon->m_ticks) == tick && (steady_clock::now() - start < seconds(60)))
|
|
{
|
|
std::this_thread::sleep_for(milliseconds(100));
|
|
}
|
|
}
|
|
}
|
|
return true;
|
|
});
|
|
}
|
|
|
|
namespace maxscale
|
|
{
|
|
|
|
MonitorWorker::MonitorWorker(const string& name, const string& module)
|
|
: Monitor(name, module)
|
|
, m_monitor(this)
|
|
, m_master(NULL)
|
|
, m_thread_running(false)
|
|
, m_shutdown(0)
|
|
, m_checked(false)
|
|
, m_loop_called(get_time_ms())
|
|
{
|
|
}
|
|
|
|
MonitorWorker::~MonitorWorker()
|
|
{
|
|
}
|
|
|
|
monitor_state_t MonitorWorker::monitor_state() const
|
|
{
|
|
return __atomic_load_n(&(Monitor::m_state), __ATOMIC_RELAXED); // TODO: Convert enum to atomic
|
|
}
|
|
|
|
void MonitorWorker::stop()
|
|
{
|
|
// This should only be called by monitor_stop(). NULL worker is allowed since the main worker may
|
|
// not exist during program start/stop.
|
|
mxb_assert(mxs_rworker_get_current() == NULL
|
|
|| mxs_rworker_get_current() == mxs_rworker_get(MXS_RWORKER_MAIN));
|
|
mxb_assert(Worker::state() != Worker::STOPPED);
|
|
mxb_assert(monitor_state() == MONITOR_STATE_STOPPING);
|
|
mxb_assert(m_thread_running.load() == true);
|
|
|
|
Worker::shutdown();
|
|
Worker::join();
|
|
m_thread_running.store(false, std::memory_order_release);
|
|
}
|
|
|
|
void MonitorWorker::diagnostics(DCB* pDcb) const
|
|
{
|
|
}
|
|
|
|
json_t* MonitorWorker::diagnostics_json() const
|
|
{
|
|
return json_object();
|
|
}
|
|
|
|
bool MonitorWorker::start(const MXS_CONFIG_PARAMETER* pParams)
|
|
{
|
|
// This should only be called by monitor_start(). NULL worker is allowed since the main worker may
|
|
// not exist during program start/stop.
|
|
mxb_assert(mxs_rworker_get_current() == NULL
|
|
|| mxs_rworker_get_current() == mxs_rworker_get(MXS_RWORKER_MAIN));
|
|
mxb_assert(Worker::state() == Worker::STOPPED);
|
|
mxb_assert(monitor_state() == MONITOR_STATE_STOPPED);
|
|
mxb_assert(m_thread_running.load() == false);
|
|
|
|
if (!m_checked)
|
|
{
|
|
if (!has_sufficient_permissions())
|
|
{
|
|
MXS_ERROR("Failed to start monitor. See earlier errors for more information.");
|
|
}
|
|
else
|
|
{
|
|
m_checked = true;
|
|
}
|
|
}
|
|
|
|
bool started = false;
|
|
if (m_checked)
|
|
{
|
|
m_master = NULL;
|
|
|
|
if (configure(pParams))
|
|
{
|
|
m_loop_called = get_time_ms() - m_settings.interval; // Next tick should happen immediately.
|
|
if (!Worker::start())
|
|
{
|
|
MXS_ERROR("Failed to start worker for monitor '%s'.", m_name);
|
|
}
|
|
else
|
|
{
|
|
// Ok, so the thread started. Let's wait until we can be certain the
|
|
// state has been updated.
|
|
m_semaphore.wait();
|
|
|
|
started = m_thread_running.load(std::memory_order_acquire);
|
|
if (!started)
|
|
{
|
|
// Ok, so the initialization failed and the thread will exit.
|
|
// We need to wait on it so that the thread resources will not leak.
|
|
Worker::join();
|
|
}
|
|
}
|
|
}
|
|
}
|
|
return started;
|
|
}
|
|
|
|
// static
|
|
int64_t MonitorWorker::get_time_ms()
|
|
{
|
|
timespec t;
|
|
|
|
MXB_AT_DEBUG(int rv = ) clock_gettime(CLOCK_MONOTONIC_COARSE, &t);
|
|
mxb_assert(rv == 0);
|
|
|
|
return t.tv_sec * 1000 + (t.tv_nsec / 1000000);
|
|
}
|
|
|
|
bool MonitorWorker::should_update_disk_space_status(const MXS_MONITORED_SERVER* pMs) const
|
|
{
|
|
bool should_check = false;
|
|
|
|
if ((m_settings.disk_space_check_interval > 0)
|
|
&& (pMs->disk_space_checked != -1) // -1 means disabled
|
|
&& (!m_settings.disk_space_limits.empty() || pMs->server->have_disk_space_limits()))
|
|
{
|
|
int64_t now = get_time_ms();
|
|
if (now - pMs->disk_space_checked > m_settings.disk_space_check_interval)
|
|
{
|
|
should_check = true;
|
|
}
|
|
}
|
|
|
|
return should_check;
|
|
}
|
|
|
|
namespace
|
|
{
|
|
|
|
bool check_disk_space_exhausted(MXS_MONITORED_SERVER* pMs,
|
|
const std::string& path,
|
|
const maxscale::disk::SizesAndName& san,
|
|
int32_t max_percentage)
|
|
{
|
|
bool disk_space_exhausted = false;
|
|
|
|
int32_t used_percentage = ((san.total() - san.available()) / (double)san.total()) * 100;
|
|
|
|
if (used_percentage >= max_percentage)
|
|
{
|
|
MXS_ERROR("Disk space on %s at %s is exhausted; %d%% of the the disk "
|
|
"mounted on the path %s has been used, and the limit it %d%%.",
|
|
pMs->server->name(),
|
|
pMs->server->address,
|
|
used_percentage,
|
|
path.c_str(),
|
|
max_percentage);
|
|
disk_space_exhausted = true;
|
|
}
|
|
|
|
return disk_space_exhausted;
|
|
}
|
|
}
|
|
|
|
void MonitorWorker::update_disk_space_status(MXS_MONITORED_SERVER* pMs)
|
|
{
|
|
std::map<std::string, disk::SizesAndName> info;
|
|
|
|
int rv = disk::get_info_by_path(pMs->con, &info);
|
|
|
|
if (rv == 0)
|
|
{
|
|
// Server-specific setting takes precedence.
|
|
auto dst = pMs->server->get_disk_space_limits();
|
|
if (dst.empty())
|
|
{
|
|
dst = m_settings.disk_space_limits;
|
|
}
|
|
|
|
bool disk_space_exhausted = false;
|
|
int32_t star_max_percentage = -1;
|
|
std::set<std::string> checked_paths;
|
|
|
|
for (const auto& dst_item : dst)
|
|
{
|
|
string path = dst_item.first;
|
|
int32_t max_percentage = dst_item.second;
|
|
|
|
if (path == "*")
|
|
{
|
|
star_max_percentage = max_percentage;
|
|
}
|
|
else
|
|
{
|
|
auto j = info.find(path);
|
|
|
|
if (j != info.end())
|
|
{
|
|
const disk::SizesAndName& san = j->second;
|
|
|
|
disk_space_exhausted = check_disk_space_exhausted(pMs, path, san, max_percentage);
|
|
checked_paths.insert(path);
|
|
}
|
|
else
|
|
{
|
|
MXS_WARNING("Disk space threshold specified for %s even though server %s at %s"
|
|
"does not have that.",
|
|
path.c_str(),
|
|
pMs->server->name(),
|
|
pMs->server->address);
|
|
}
|
|
}
|
|
}
|
|
|
|
if (star_max_percentage != -1)
|
|
{
|
|
for (auto j = info.begin(); j != info.end(); ++j)
|
|
{
|
|
string path = j->first;
|
|
|
|
if (checked_paths.find(path) == checked_paths.end())
|
|
{
|
|
const disk::SizesAndName& san = j->second;
|
|
|
|
disk_space_exhausted = check_disk_space_exhausted(pMs, path, san, star_max_percentage);
|
|
}
|
|
}
|
|
}
|
|
|
|
if (disk_space_exhausted)
|
|
{
|
|
pMs->pending_status |= SERVER_DISK_SPACE_EXHAUSTED;
|
|
}
|
|
else
|
|
{
|
|
pMs->pending_status &= ~SERVER_DISK_SPACE_EXHAUSTED;
|
|
}
|
|
|
|
pMs->disk_space_checked = get_time_ms();
|
|
}
|
|
else
|
|
{
|
|
SERVER* pServer = pMs->server;
|
|
|
|
if (mysql_errno(pMs->con) == ER_UNKNOWN_TABLE)
|
|
{
|
|
// Disable disk space checking for this server.
|
|
pMs->disk_space_checked = -1;
|
|
|
|
MXS_ERROR("Disk space cannot be checked for %s at %s, because either the "
|
|
"version (%s) is too old, or the DISKS information schema plugin "
|
|
"has not been installed. Disk space checking has been disabled.",
|
|
pServer->name(),
|
|
pServer->address,
|
|
pServer->version_string().c_str());
|
|
}
|
|
else
|
|
{
|
|
MXS_ERROR("Checking the disk space for %s at %s failed due to: (%d) %s",
|
|
pServer->name(),
|
|
pServer->address,
|
|
mysql_errno(pMs->con),
|
|
mysql_error(pMs->con));
|
|
}
|
|
}
|
|
}
|
|
|
|
bool MonitorWorker::configure(const MXS_CONFIG_PARAMETER* pParams)
|
|
{
|
|
return true;
|
|
}
|
|
|
|
bool MonitorWorker::has_sufficient_permissions()
|
|
{
|
|
return true;
|
|
}
|
|
|
|
void MonitorWorker::flush_server_status()
|
|
{
|
|
for (MXS_MONITORED_SERVER* pMs : m_servers)
|
|
{
|
|
if (!pMs->server->is_in_maint())
|
|
{
|
|
pMs->server->status = pMs->pending_status;
|
|
}
|
|
}
|
|
}
|
|
|
|
void MonitorWorkerSimple::pre_tick()
|
|
{
|
|
}
|
|
|
|
void MonitorWorkerSimple::post_tick()
|
|
{
|
|
}
|
|
|
|
void MonitorWorkerSimple::tick()
|
|
{
|
|
pre_tick();
|
|
|
|
for (MXS_MONITORED_SERVER* pMs : m_servers)
|
|
{
|
|
if (!pMs->server->is_in_maint())
|
|
{
|
|
pMs->mon_prev_status = pMs->server->status;
|
|
pMs->pending_status = pMs->server->status;
|
|
|
|
mxs_connect_result_t rval = pMs->ping_or_connect(m_settings.conn_settings);
|
|
|
|
if (mon_connection_is_ok(rval))
|
|
{
|
|
monitor_clear_pending_status(pMs, SERVER_AUTH_ERROR);
|
|
monitor_set_pending_status(pMs, SERVER_RUNNING);
|
|
|
|
if (should_update_disk_space_status(pMs))
|
|
{
|
|
update_disk_space_status(pMs);
|
|
}
|
|
|
|
update_server_status(pMs);
|
|
}
|
|
else
|
|
{
|
|
/**
|
|
* TODO: Move the bits that do not represent a state out of
|
|
* the server state bits. This would allow clearing the state by
|
|
* zeroing it out.
|
|
*/
|
|
const uint64_t bits_to_clear = ~SERVER_WAS_MASTER;
|
|
|
|
monitor_clear_pending_status(pMs, bits_to_clear);
|
|
|
|
if (mysql_errno(pMs->con) == ER_ACCESS_DENIED_ERROR)
|
|
{
|
|
monitor_set_pending_status(pMs, SERVER_AUTH_ERROR);
|
|
}
|
|
else
|
|
{
|
|
monitor_clear_pending_status(pMs, SERVER_AUTH_ERROR);
|
|
}
|
|
|
|
if (mon_status_changed(pMs) && mon_print_fail_status(pMs))
|
|
{
|
|
mon_log_connect_error(pMs, rval);
|
|
}
|
|
}
|
|
|
|
#if defined (SS_DEBUG)
|
|
if (mon_status_changed(pMs) || mon_print_fail_status(pMs))
|
|
{
|
|
// The current status is still in pMs->pending_status.
|
|
MXS_DEBUG("Backend server [%s]:%d state : %s",
|
|
pMs->server->address, pMs->server->port,
|
|
SERVER::status_to_string(pMs->pending_status).c_str());
|
|
}
|
|
#endif
|
|
|
|
if (pMs->server->is_down())
|
|
{
|
|
pMs->mon_err_count += 1;
|
|
}
|
|
else
|
|
{
|
|
pMs->mon_err_count = 0;
|
|
}
|
|
}
|
|
}
|
|
|
|
post_tick();
|
|
}
|
|
|
|
void MonitorWorker::pre_loop()
|
|
{
|
|
}
|
|
|
|
void MonitorWorker::post_loop()
|
|
{
|
|
}
|
|
|
|
void MonitorWorker::process_state_changes()
|
|
{
|
|
detect_handle_state_changes();
|
|
}
|
|
|
|
bool MonitorWorker::pre_run()
|
|
{
|
|
bool rv = false;
|
|
|
|
if (mysql_thread_init() == 0)
|
|
{
|
|
rv = true;
|
|
// Write and post the semaphore to signal the admin thread that the start is succeeding.
|
|
m_thread_running.store(true, std::memory_order_release);
|
|
m_semaphore.post();
|
|
|
|
load_server_journal(m_monitor, &m_master);
|
|
pre_loop();
|
|
delayed_call(1, &MonitorWorker::call_run_one_tick, this);
|
|
}
|
|
else
|
|
{
|
|
MXS_ERROR("mysql_thread_init() failed for %s. The monitor cannot start.", m_name);
|
|
m_semaphore.post();
|
|
}
|
|
|
|
return rv;
|
|
}
|
|
|
|
void MonitorWorker::post_run()
|
|
{
|
|
post_loop();
|
|
|
|
mysql_thread_end();
|
|
}
|
|
|
|
bool MonitorWorker::call_run_one_tick(Worker::Call::action_t action)
|
|
{
|
|
/** This is both the minimum sleep between two ticks and also the maximum time between early
|
|
* wakeup checks. */
|
|
const int base_interval_ms = 100;
|
|
if (action == Worker::Call::EXECUTE)
|
|
{
|
|
int64_t now = get_time_ms();
|
|
// Enough time has passed,
|
|
if ((now - m_loop_called > m_settings.interval)
|
|
// or maintenance flag is set,
|
|
|| atomic_load_int(&this->check_status_flag) == Monitor::STATUS_FLAG_CHECK
|
|
// or a monitor-specific condition is met.
|
|
|| immediate_tick_required())
|
|
{
|
|
m_loop_called = now;
|
|
run_one_tick();
|
|
now = get_time_ms();
|
|
}
|
|
|
|
int64_t ms_to_next_call = m_settings.interval - (now - m_loop_called);
|
|
// ms_to_next_call will be negative, if the run_one_tick() call took
|
|
// longer than one monitor interval.
|
|
int64_t delay = ((ms_to_next_call <= 0) || (ms_to_next_call >= base_interval_ms)) ?
|
|
base_interval_ms : ms_to_next_call;
|
|
|
|
delayed_call(delay, &MonitorWorker::call_run_one_tick, this);
|
|
}
|
|
return false;
|
|
}
|
|
|
|
void MonitorWorker::run_one_tick()
|
|
{
|
|
monitor_check_maintenance_requests(m_monitor);
|
|
|
|
tick();
|
|
mxb::atomic::add(&m_ticks, 1, mxb::atomic::RELAXED);
|
|
|
|
flush_server_status();
|
|
|
|
process_state_changes();
|
|
|
|
mon_hangup_failed_servers(m_monitor);
|
|
store_server_journal(m_monitor, m_master);
|
|
}
|
|
|
|
bool MonitorWorker::immediate_tick_required() const
|
|
{
|
|
return false;
|
|
}
|
|
}
|
|
|
|
MXS_MONITORED_SERVER::MXS_MONITORED_SERVER(SERVER* server)
|
|
: server(server)
|
|
, disk_space_checked(maxscale::MonitorWorker::get_time_ms()) // Pretend disk space was just checked.
|
|
{
|
|
}
|