mirror of
https://github.com/prometheus-community/postgres_exporter
synced 2025-04-28 05:58:02 +00:00
102 lines
2.3 KiB
Go
102 lines
2.3 KiB
Go
// Copyright 2023 The Prometheus Authors
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may 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, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package collector
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import (
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"context"
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"database/sql"
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"github.com/go-kit/log"
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"github.com/prometheus/client_golang/prometheus"
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)
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const blockedSubsystem = "blocked"
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func init() {
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registerCollector(blockedSubsystem, defaultDisabled, NewPGBlockedCollector)
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}
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type PGBlockedCollector struct {
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log log.Logger
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}
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func NewPGBlockedCollector(config collectorConfig) (Collector, error) {
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return &PGBlockedCollector{log: config.logger}, nil
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}
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var (
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blockedQueries = prometheus.NewDesc(
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prometheus.BuildFQName(namespace, blockedSubsystem, "queries"),
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"The current number of blocked queries",
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[]string{"table"},
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prometheus.Labels{},
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)
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blockedQuery = `
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SELECT
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count(blocked.transactionid) AS queries,
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'__transaction__' AS table
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FROM pg_catalog.pg_locks blocked
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WHERE NOT blocked.granted AND locktype = 'transactionid'
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GROUP BY locktype
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UNION
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SELECT
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count(blocked.relation) AS queries,
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blocked.relation::regclass::text AS table
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FROM pg_catalog.pg_locks blocked
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WHERE NOT blocked.granted AND locktype != 'transactionid'
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GROUP BY relation
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`
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)
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func (PGBlockedCollector) Update(ctx context.Context, instance *instance, ch chan<- prometheus.Metric) error {
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db := instance.getDB()
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rows, err := db.QueryContext(ctx,
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blockedQuery)
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if err != nil {
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return err
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}
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defer rows.Close()
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for rows.Next() {
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var table sql.NullString
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var queries sql.NullFloat64
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if err := rows.Scan(&queries, &table); err != nil {
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return err
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}
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tableLabel := "unknown"
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if table.Valid {
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tableLabel = table.String
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}
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queriesMetric := 0.0
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if queries.Valid {
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queriesMetric = queries.Float64
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}
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ch <- prometheus.MustNewConstMetric(
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blockedQueries,
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prometheus.GaugeValue,
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queriesMetric,
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tableLabel,
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)
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}
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if err := rows.Err(); err != nil {
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return err
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}
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return nil
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}
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