dd9ff27743
In progress, does not yet overwrite existing code. The new promotion mechanism automatically retries queries which timed out. It also handles multimaster situations correctly.
108 lines
3.5 KiB
C++
108 lines
3.5 KiB
C++
/*
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* Copyright (c) 2018 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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#pragma once
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/**
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* Common definitions for MariaDBMonitor module. Should be included in every header or source file.
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*/
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#define MXS_MODULE_NAME "mariadbmon"
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#include <maxscale/ccdefs.hh>
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#include <string>
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#include <maxscale/json_api.h>
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#include <maxbase/stopwatch.hh>
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/** Utility macros for printing both MXS_ERROR and json error */
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#define PRINT_MXS_JSON_ERROR(err_out, format, ...) \
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do { \
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MXS_ERROR(format, ##__VA_ARGS__); \
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if (err_out) \
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{ \
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*err_out = mxs_json_error_append(*err_out, format, ##__VA_ARGS__); \
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} \
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} while (false)
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#define PRINT_ERROR_IF(log_mode, err_out, format, ...) \
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if (log_mode == Log::ON) \
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{ \
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PRINT_MXS_JSON_ERROR(err_out, format, ##__VA_ARGS__); \
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} \
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extern const int64_t SERVER_ID_UNKNOWN;
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extern const int64_t GTID_DOMAIN_UNKNOWN;
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extern const int PORT_UNKNOWN;
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extern const char* const CN_HANDLE_EVENTS;
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// Helper class for concatenating strings with a delimiter.
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class DelimitedPrinter
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{
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private:
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DelimitedPrinter(const DelimitedPrinter&) = delete;
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DelimitedPrinter& operator=(const DelimitedPrinter&) = delete;
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DelimitedPrinter() = delete;
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public:
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DelimitedPrinter(const std::string& separator);
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/**
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* Add to string.
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*
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* @param target String to modify
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* @param addition String to add. The delimiter is printed before the addition.
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*/
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void cat(std::string& target, const std::string& addition);
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private:
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const std::string m_separator;
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std::string m_current_separator;
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};
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enum class Log
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{
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OFF,
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ON
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};
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enum class OperationType
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{
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SWITCHOVER,
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FAILOVER
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};
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class MariaDBServer;
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/**
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* Class which encapsulates many settings and status descriptors for a failover/switchover.
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* Is more convenient to pass around than the separate elements. Most fields are constants or constant
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* pointers since they should not change during an operation.
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*/
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class ClusterOperation
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{
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public:
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const OperationType type; // Failover or switchover
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MariaDBServer* const promotion_target; // Which server will be promoted
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MariaDBServer* const demotion_target; // Which server will be demoted
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const bool demotion_target_is_master; // Was the demotion target the master?
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const bool handle_events; // Should scheduled server events be disabled/enabled?
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const std::string promotion_sql_file; // SQL commands ran on a server promoted to master
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const std::string demotion_sql_file; // SQL commands ran on a server demoted from master
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json_t** const error_out; // Json error output
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maxbase::Duration time_remaining; // How much time remains to complete the operation
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ClusterOperation(OperationType type,
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MariaDBServer* promotion_target, MariaDBServer* demotion_target,
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bool demo_target_is_master, bool handle_events,
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std::string& promotion_sql_file, std::string& demotion_sql_file,
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json_t** error, maxbase::Duration time_remaining);
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};
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