90 lines
2.9 KiB
Go
90 lines
2.9 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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package statement
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import (
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"database/sql"
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"github.com/pkg/errors"
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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/metricbeat/mb"
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"github.com/elastic/beats/metricbeat/module/postgresql"
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// Register postgresql database/sql driver
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_ "github.com/lib/pq"
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)
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// init registers the MetricSet with the central registry as soon as the program
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// starts. The New function will be called later to instantiate an instance of
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// the MetricSet for each host defined in the module's configuration. After the
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// MetricSet has been created then Fetch will begin to be called periodically.
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func init() {
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mb.Registry.MustAddMetricSet("postgresql", "statement", New,
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mb.WithHostParser(postgresql.ParseURL),
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)
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}
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// MetricSet holds any configuration or state information. It must implement
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// the mb.MetricSet interface. And this is best achieved by embedding
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// mb.BaseMetricSet because it implements all of the required mb.MetricSet
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// interface methods except for Fetch.
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type MetricSet struct {
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mb.BaseMetricSet
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}
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// New creates a new instance of the MetricSet. New is responsible for unpacking
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// any MetricSet specific configuration options if there are any.
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func New(base mb.BaseMetricSet) (mb.MetricSet, error) {
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cfgwarn.Beta("The statement metricset is beta")
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config := struct{}{}
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if err := base.Module().UnpackConfig(&config); err != nil {
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return nil, err
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}
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return &MetricSet{
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BaseMetricSet: base,
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}, nil
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}
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// Fetch methods implements the data gathering and data conversion to the right
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// format. It publishes the event which is then forwarded to the output. In case
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// of an error set the Error field of mb.Event or simply call report.Error().
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func (m *MetricSet) Fetch() ([]common.MapStr, error) {
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db, err := sql.Open("postgres", m.HostData().URI)
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if err != nil {
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return nil, err
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}
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defer db.Close()
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results, err := postgresql.QueryStats(db, "SELECT * FROM pg_stat_statements")
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if err != nil {
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return nil, errors.Wrap(err, "QueryStats")
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}
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events := []common.MapStr{}
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for _, result := range results {
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data, _ := schema.Apply(result)
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events = append(events, data)
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}
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return events, nil
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}
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