179 lines
4.3 KiB
C++
179 lines
4.3 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: 2025-10-29
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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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#define MXS_MODULE_NAME "csmon"
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#include "csmon.hh"
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#include <regex>
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#include <vector>
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#include <string>
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#include <maxscale/modinfo.h>
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#include <maxscale/mysql_utils.hh>
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using maxscale::MonitorServer;
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namespace
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{
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constexpr const char* alive_query = "SELECT mcsSystemReady() = 1 && mcsSystemReadOnly() <> 2";
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constexpr const char* role_query = "SELECT mcsSystemPrimary()";
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// Helper for extracting string results from queries
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static std::string do_query(MonitorServer* srv, const char* query)
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{
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std::string rval;
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MYSQL_RES* result;
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if (mxs_mysql_query(srv->con, query) == 0 && (result = mysql_store_result(srv->con)))
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{
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MYSQL_ROW row = mysql_fetch_row(result);
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if (row && row[0])
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{
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rval = row[0];
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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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srv->mon_report_query_error();
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}
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return rval;
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}
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// Returns a numeric version similar to mysql_get_server_version
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int get_cs_version(MonitorServer* srv)
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{
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int rval = -1;
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std::string prefix = "Columnstore ";
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std::string result = do_query(srv, "SELECT @@version_comment");
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auto pos = result.find(prefix);
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auto to_version = [](std::string str) {
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std::istringstream os(str);
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int major = 0, minor = 0, patch = 0;
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char dot;
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os >> major;
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os >> dot;
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os >> minor;
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os >> dot;
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os >> patch;
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return major * 10000 + minor * 100 + patch;
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};
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if (pos != std::string::npos)
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{
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rval = to_version(result.substr(pos + prefix.length()));
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}
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else
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{
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auto cs_version = do_query(srv, "SELECT VARIABLE_VALUE FROM information_schema.GLOBAL_STATUS "
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"WHERE VARIABLE_NAME = 'Columnstore_version'");
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if (!cs_version.empty())
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{
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rval = to_version(cs_version);
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}
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}
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return rval;
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}
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}
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CsMonitor::CsMonitor(const std::string& name, const std::string& module)
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: MonitorWorkerSimple(name, module)
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{
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}
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CsMonitor::~CsMonitor()
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{
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}
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// static
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CsMonitor* CsMonitor::create(const std::string& name, const std::string& module)
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{
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return new CsMonitor(name, module);
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}
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bool CsMonitor::has_sufficient_permissions()
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{
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return test_permissions(alive_query);
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}
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void CsMonitor::update_server_status(MonitorServer* srv)
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{
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srv->clear_pending_status(SERVER_MASTER | SERVER_SLAVE | SERVER_RUNNING);
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int status = 0;
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if (do_query(srv, alive_query) == "1")
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{
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auto version = get_cs_version(srv);
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if (version >= 0)
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{
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status |= SERVER_RUNNING;
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if (version >= 10200)
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{
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// 1.2 supports the mcsSystemPrimary function
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status |= do_query(srv, role_query) == "1" ? SERVER_MASTER : SERVER_SLAVE;
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}
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else
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{
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status |= srv->server == m_primary ? SERVER_MASTER : SERVER_SLAVE;
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}
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}
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}
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srv->set_pending_status(status);
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}
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bool CsMonitor::configure(const MXS_CONFIG_PARAMETER* pParams)
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{
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if (!MonitorWorkerSimple::configure(pParams))
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{
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return false;
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}
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m_primary = pParams->get_server("primary");
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return true;
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}
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extern "C" MXS_MODULE* MXS_CREATE_MODULE()
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{
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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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"MariaDB ColumnStore monitor",
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"V1.0.0",
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MXS_NO_MODULE_CAPABILITIES,
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&maxscale::MonitorApi<CsMonitor>::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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{"primary", MXS_MODULE_PARAM_SERVER},
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{MXS_END_MODULE_PARAMS}
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}
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};
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return &info;
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}
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