143 lines
3.5 KiB
C++
143 lines
3.5 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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#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.h>
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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(MXS_MONITORED_SERVER* 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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mon_report_query_error(srv);
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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(MXS_MONITORED_SERVER* srv)
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{
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// GCC 4.8 appears to have a broken std::regex_constants::ECMAScript that doesn't support brackets
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std::regex re("Columnstore \\([0-9]*\\)[.]\\([0-9]*\\)[.]\\([0-9]*\\)-[0-9]*",
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std::regex_constants::basic);
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std::string result = do_query(srv, "SELECT @@version_comment");
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std::smatch match;
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int rval = 0;
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if (std::regex_match(result, match, re) && match.size() == 4)
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{
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rval = atoi(match[1].str().c_str()) * 10000 + atoi(match[2].str().c_str()) * 100
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+ atoi(match[3].str().c_str());
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}
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return rval;
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}
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}
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CsMonitor::CsMonitor(MXS_MONITOR* monitor)
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: maxscale::MonitorInstanceSimple(monitor)
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, m_primary(config_get_server(monitor->parameters, "primary"))
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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(MXS_MONITOR* monitor)
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{
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return new CsMonitor(monitor);
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}
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bool CsMonitor::has_sufficient_permissions() const
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{
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return check_monitor_permissions(m_monitor, alive_query);
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}
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void CsMonitor::update_server_status(MXS_MONITORED_SERVER* srv)
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{
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monitor_clear_pending_status(srv, 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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status |= SERVER_RUNNING;
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if (get_cs_version(srv) >= 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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monitor_set_pending_status(srv, status);
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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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