129 lines
4.6 KiB
C++
129 lines
4.6 KiB
C++
#pragma once
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#ifndef _GALERAMON_H
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#define _GALERAMON_H
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/*
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* Copyright (c) 2016 MariaDB Corporation Ab
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*
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* Use of this software is governed by the Business Source License included
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* in the LICENSE.TXT file and at www.mariadb.com/bsl11.
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*
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* Change Date: 2020-01-01
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*
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* On the date above, in accordance with the Business Source License, use
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* of this software will be governed by version 2 or later of the General
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* Public License.
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*/
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/**
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* @file galeramon.h - The Galera cluster monitor
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*
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* @verbatim
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* Revision History
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*
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* Date Who Description
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* 07/05/15 Markus Makela Initial Implementation of galeramon.h
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* @endverbatim
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*/
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#include <maxscale/cppdefs.hh>
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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 <maxscale/monitor.hh>
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#include <maxscale/spinlock.h>
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#include <maxscale/thread.h>
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#include <mysql.h>
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#include <mysqld_error.h>
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#include <maxscale/log_manager.h>
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#include <maxscale/secrets.h>
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#include <maxscale/dcb.h>
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#include <maxscale/modinfo.h>
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#include <maxscale/config.h>
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#include <maxscale/hashtable.h>
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/**
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* Galera Variables and server reference for each
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* monitored node that could be part of cluster.
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*
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* This struct is added to the HASHTABLE *galera_nodes_info
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*/
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typedef struct galera_node_info
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{
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int joined; /**< The node claims to be "Synced" */
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int local_index; /**< wsrep_local_index Galera variable:
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* the node index vlaue in the cluster */
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int local_state; /**< wsrep_local_state Galera variable:
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* the node state in the cluster */
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int cluster_size; /**< wsrep_cluster_size Galera variable:
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* the cluster size the node sees */
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char *cluster_uuid; /**< wsrep_cluster_uuid Galera variable:
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* the cluster UUID the node sees */
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const SERVER *node; /**< The reference to nodes' SERVER struct */
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} GALERA_NODE_INFO;
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/**
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* Information of the current detected
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* Galera Cluster
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*/
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typedef struct galera_cluster_info
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{
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int c_size; /**< How many nodes in the cluster */
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char *c_uuid; /**< The Cluster UUID */
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} GALERA_CLUSTER_INFO;
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/**
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* The handle for an instance of a Galera Monitor module
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*/
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class GaleraMonitor : public MXS_MONITOR_INSTANCE
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{
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public:
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GaleraMonitor(const GaleraMonitor&) = delete;
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GaleraMonitor& operator = (const GaleraMonitor&) = delete;
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static GaleraMonitor* create(MXS_MONITOR* monitor);
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void destroy();
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bool start(const MXS_CONFIG_PARAMETER* param);
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void stop();
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void diagnostics(DCB* dcb) const;
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json_t* diagnostics_json() const;
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private:
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THREAD m_thread; /**< Monitor thread */
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int m_shutdown; /**< Flag to shutdown the monitor thread */
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int m_status; /**< Monitor status */
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unsigned long m_id; /**< Monitor ID */
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int m_disableMasterFailback; /**< Monitor flag for Galera Cluster Master failback */
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int m_availableWhenDonor; /**< Monitor flag for Galera Cluster Donor availability */
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bool m_disableMasterRoleSetting; /**< Monitor flag to disable setting master role */
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MXS_MONITORED_SERVER *m_master; /**< Master server for MySQL Master/Slave replication */
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char* m_script; /**< Launchable script */
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bool m_root_node_as_master; /**< Whether we require that the Master should
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* have a wsrep_local_index of 0 */
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bool m_use_priority; /**< Use server priorities */
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uint64_t m_events; /**< Enabled monitor events */
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bool m_set_donor_nodes; /**< set the wrep_sst_donor variable with an
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* ordered list of nodes */
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HASHTABLE *m_galera_nodes_info; /**< Contains Galera Cluster variables of all nodes */
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GALERA_CLUSTER_INFO m_cluster_info; /**< Contains Galera cluster info */
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MXS_MONITOR* m_monitor; /**< Pointer to generic monitor structure */
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bool m_checked; /**< Whether server access has been checked */
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GaleraMonitor(MXS_MONITOR* monitor);
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~GaleraMonitor();
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bool detect_cluster_size(const int n_nodes,
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const char *candidate_uuid,
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const int candidate_size);
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MXS_MONITORED_SERVER *get_candidate_master();
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void monitorDatabase(MXS_MONITORED_SERVER *database);
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void reset_cluster_info();
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void set_cluster_members();
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void set_galera_cluster();
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void update_sst_donor_nodes(int is_cluster);
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void main();
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static void main(void* data);
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};
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#endif
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