81 lines
3.0 KiB
C++
81 lines
3.0 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: 2023-10-29
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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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* @file galeramon.hh - The Galera cluster monitor
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*/
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#include <maxscale/ccdefs.hh>
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#include <unordered_map>
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#include <maxscale/monitor.hh>
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/**
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* Galera status variables
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*/
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struct GaleraNode
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{
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int joined; /**< Node is in sync with the cluster */
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int local_index; /**< Node index */
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int local_state; /**< Node state */
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int cluster_size; /**< The cluster size*/
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std::string cluster_uuid; /**< Cluster UUID */
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};
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typedef std::unordered_map<MXS_MONITORED_SERVER*, GaleraNode> NodeMap;
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class GaleraMonitor : public maxscale::MonitorInstanceSimple
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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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~GaleraMonitor();
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static GaleraMonitor* create(MXS_MONITOR* monitor);
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void diagnostics(DCB* dcb) const;
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json_t* diagnostics_json() const;
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protected:
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bool configure(const MXS_CONFIG_PARAMETER* param);
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bool has_sufficient_permissions() const;
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void update_server_status(MXS_MONITORED_SERVER* monitored_server);
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void pre_tick();
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void post_tick();
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private:
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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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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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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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std::string m_cluster_uuid; /**< The Cluster UUID */
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bool m_log_no_members; /**< Should we log if no member are found. */
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NodeMap m_info; /**< Contains Galera Cluster variables of all nodes */
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int m_cluster_size; /**< How many nodes in the cluster */
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GaleraMonitor(MXS_MONITOR* monitor);
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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 set_galera_cluster();
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void update_sst_donor_nodes(int is_cluster);
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};
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