113 lines
3.1 KiB
Go
113 lines
3.1 KiB
Go
// Licensed to Elasticsearch B.V. under one or more contributor
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// license agreements. See the NOTICE file distributed with
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// this work for additional information regarding copyright
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// ownership. Elasticsearch B.V. licenses this file to you under
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// the Apache License, Version 2.0 (the "License"); you may
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// not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing,
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// software distributed under the License is distributed on an
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// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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// KIND, either express or implied. See the License for the
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// specific language governing permissions and limitations
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// under the License.
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/*
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Package galera_status fetches MySQL Galera server status metrics.
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For more information on the query it uses, see:
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http://dev.mysql.com/doc/refman/5.7/en/show-status.html
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http://galeracluster.com/documentation-webpages/galerastatusvariables.html
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*/
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package galera_status
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import (
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"database/sql"
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"github.com/elastic/beats/libbeat/common"
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"github.com/elastic/beats/libbeat/common/cfgwarn"
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"github.com/elastic/beats/libbeat/logp"
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"github.com/elastic/beats/metricbeat/mb"
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"github.com/elastic/beats/metricbeat/module/mysql"
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"github.com/pkg/errors"
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)
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var (
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debugf = logp.MakeDebug("mysql-galera-status")
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)
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// init registers the MetricSet with the central registry.
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func init() {
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mb.Registry.MustAddMetricSet("mysql", "galera_status", New,
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mb.WithHostParser(mysql.ParseDSN),
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)
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}
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// MetricSet for fetching Galera-MySQL server status
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type MetricSet struct {
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mb.BaseMetricSet
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db *sql.DB
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}
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// New create a new instance of the MetricSet
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// Loads query_mode config setting from the config file
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func New(base mb.BaseMetricSet) (mb.MetricSet, error) {
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cfgwarn.Experimental("The mysql galera_status metricset is experimental")
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return &MetricSet{BaseMetricSet: base}, nil
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}
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// Fetch methods implements the data gathering and data conversion to the right format
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// It returns the event which is then forward to the output.
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func (m *MetricSet) Fetch() (common.MapStr, error) {
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if m.db == nil {
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var err error
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m.db, err = mysql.NewDB(m.HostData().URI)
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if err != nil {
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return nil, errors.Wrap(err, "Galera-status fetch failed")
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}
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}
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status, err := m.loadStatus(m.db)
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if err != nil {
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return nil, err
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}
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event := eventMapping(status)
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if m.Module().Config().Raw {
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event["raw"] = rawEventMapping(status)
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}
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return event, nil
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}
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// loadStatus loads all status entries from the given database into an array.
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func (m *MetricSet) loadStatus(db *sql.DB) (map[string]string, error) {
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// Returns the global status, also for versions previous 5.0.2
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rows, err := db.Query("SHOW /*!50002 GLOBAL */ STATUS LIKE 'wsrep_%';")
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if err != nil {
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return nil, err
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}
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defer rows.Close()
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galeraStatus := map[string]string{}
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for rows.Next() {
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var name string
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var value string
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err = rows.Scan(&name, &value)
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if err != nil {
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return nil, err
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}
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galeraStatus[name] = value
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}
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return galeraStatus, nil
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}
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