159 lines
4.4 KiB
C++
159 lines
4.4 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 ndbcluster_mon.c - A MySQL cluster SQL node monitor
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*/
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#define MXS_MODULE_NAME "ndbclustermon"
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#include "ndbclustermon.hh"
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#include <maxscale/alloc.h>
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#include <maxscale/mysql_utils.hh>
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NDBCMonitor::NDBCMonitor(MXS_MONITOR* monitor)
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: maxscale::MonitorInstanceSimple(monitor)
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, m_id(MXS_MONITOR_DEFAULT_ID)
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{
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}
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NDBCMonitor::~NDBCMonitor()
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{
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}
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// static
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NDBCMonitor* NDBCMonitor::create(MXS_MONITOR* monitor)
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{
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return new NDBCMonitor(monitor);
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}
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bool NDBCMonitor::has_sufficient_permissions() const
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{
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return check_monitor_permissions(m_monitor, "SHOW STATUS LIKE 'Ndb_number_of_ready_data_nodes'");
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}
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void NDBCMonitor::update_server_status(MXS_MONITORED_SERVER* monitored_server)
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{
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MYSQL_ROW row;
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MYSQL_RES* result;
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int isjoined = 0;
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char* server_string;
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/* get server version string */
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mxs_mysql_update_server_version(monitored_server->con, monitored_server->server);
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server_string = monitored_server->server->version_string;
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/* Check if the the SQL node is able to contact one or more data nodes */
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if (mxs_mysql_query(monitored_server->con, "SHOW STATUS LIKE 'Ndb_number_of_ready_data_nodes'") == 0
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&& (result = mysql_store_result(monitored_server->con)) != NULL)
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{
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if (mysql_field_count(monitored_server->con) < 2)
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{
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mysql_free_result(result);
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MXS_ERROR("Unexpected result for \"SHOW STATUS LIKE "
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"'Ndb_number_of_ready_data_nodes'\". Expected 2 columns."
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" MySQL Version: %s",
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server_string);
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return;
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}
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while ((row = mysql_fetch_row(result)))
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{
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if (atoi(row[1]) > 0)
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{
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isjoined = 1;
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}
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}
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mysql_free_result(result);
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}
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else
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{
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mon_report_query_error(monitored_server);
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}
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/* Check the the SQL node id in the MySQL cluster */
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if (mxs_mysql_query(monitored_server->con, "SHOW STATUS LIKE 'Ndb_cluster_node_id'") == 0
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&& (result = mysql_store_result(monitored_server->con)) != NULL)
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{
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if (mysql_field_count(monitored_server->con) < 2)
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{
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mysql_free_result(result);
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MXS_ERROR("Unexpected result for \"SHOW STATUS LIKE 'Ndb_cluster_node_id'\". "
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"Expected 2 columns."
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" MySQL Version: %s",
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server_string);
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return;
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}
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long cluster_node_id = -1;
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while ((row = mysql_fetch_row(result)))
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{
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cluster_node_id = strtol(row[1], NULL, 10);
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if ((errno == ERANGE && (cluster_node_id == LONG_MAX
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|| cluster_node_id == LONG_MIN)) || (errno != 0 && cluster_node_id == 0))
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{
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cluster_node_id = -1;
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}
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monitored_server->server->node_id = cluster_node_id;
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}
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mysql_free_result(result);
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}
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else
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{
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mon_report_query_error(monitored_server);
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}
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if (isjoined)
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{
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monitor_set_pending_status(monitored_server, SERVER_NDB);
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}
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else
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{
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monitor_clear_pending_status(monitored_server, SERVER_NDB);
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}
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}
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/**
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* The module entry point routine. It is this routine that
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* must populate the structure that is referred to as the
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* "module object", this is a structure with the set of
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* external entry points for this module.
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*
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* @return The module object
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*/
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extern "C" MXS_MODULE* MXS_CREATE_MODULE()
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{
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MXS_NOTICE("Initialise the MySQL Cluster Monitor module.");
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static MXS_MODULE info =
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{
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MXS_MODULE_API_MONITOR,
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MXS_MODULE_BETA_RELEASE,
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MXS_MONITOR_VERSION,
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"A MySQL cluster SQL node monitor",
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"V2.1.0",
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MXS_NO_MODULE_CAPABILITIES,
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&maxscale::MonitorApi<NDBCMonitor>::s_api,
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NULL, /* Process init. */
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NULL, /* Process finish. */
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NULL, /* Thread init. */
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NULL, /* Thread finish. */
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{
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{MXS_END_MODULE_PARAMS} // No parameters
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}
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};
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return &info;
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}
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