131 lines
3.3 KiB
Go
131 lines
3.3 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 replicationSlotSubsystem = "replication_slot"
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func init() {
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registerCollector(replicationSlotSubsystem, defaultEnabled, NewPGReplicationSlotCollector)
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}
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type PGReplicationSlotCollector struct {
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log log.Logger
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}
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func NewPGReplicationSlotCollector(config collectorConfig) (Collector, error) {
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return &PGReplicationSlotCollector{log: config.logger}, nil
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}
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var (
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pgReplicationSlotCurrentWalDesc = prometheus.NewDesc(
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prometheus.BuildFQName(
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namespace,
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replicationSlotSubsystem,
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"slot_current_wal_lsn",
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),
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"current wal lsn value",
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[]string{"slot_name"}, nil,
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)
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pgReplicationSlotCurrentFlushDesc = prometheus.NewDesc(
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prometheus.BuildFQName(
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namespace,
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replicationSlotSubsystem,
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"slot_confirmed_flush_lsn",
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),
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"last lsn confirmed flushed to the replication slot",
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[]string{"slot_name"}, nil,
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)
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pgReplicationSlotIsActiveDesc = prometheus.NewDesc(
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prometheus.BuildFQName(
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namespace,
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replicationSlotSubsystem,
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"slot_is_active",
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),
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"whether the replication slot is active or not",
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[]string{"slot_name"}, nil,
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)
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pgReplicationSlotQuery = `SELECT
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slot_name,
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pg_current_wal_lsn() - '0/0' AS current_wal_lsn,
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coalesce(confirmed_flush_lsn, '0/0') - '0/0',
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active
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FROM
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pg_replication_slots;`
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)
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func (PGReplicationSlotCollector) 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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pgReplicationSlotQuery)
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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 slotName sql.NullString
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var walLSN sql.NullFloat64
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var flushLSN sql.NullFloat64
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var isActive sql.NullBool
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if err := rows.Scan(&slotName, &walLSN, &flushLSN, &isActive); err != nil {
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return err
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}
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isActiveValue := 0.0
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if isActive.Valid && isActive.Bool {
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isActiveValue = 1.0
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}
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slotNameLabel := "unknown"
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if slotName.Valid {
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slotNameLabel = slotName.String
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}
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var walLSNMetric float64
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if walLSN.Valid {
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walLSNMetric = walLSN.Float64
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}
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ch <- prometheus.MustNewConstMetric(
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pgReplicationSlotCurrentWalDesc,
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prometheus.GaugeValue, walLSNMetric, slotNameLabel,
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)
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if isActive.Valid && isActive.Bool {
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var flushLSNMetric float64
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if flushLSN.Valid {
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flushLSNMetric = flushLSN.Float64
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}
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ch <- prometheus.MustNewConstMetric(
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pgReplicationSlotCurrentFlushDesc,
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prometheus.GaugeValue, flushLSNMetric, slotNameLabel,
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)
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}
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ch <- prometheus.MustNewConstMetric(
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pgReplicationSlotIsActiveDesc,
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prometheus.GaugeValue, isActiveValue, slotNameLabel,
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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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