mirror of
https://github.com/prometheus-community/postgres_exporter
synced 2024-12-12 18:05:42 +00:00
97 lines
2.6 KiB
Go
97 lines
2.6 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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func init() {
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registerCollector("replication_slot", 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(logger log.Logger) (Collector, error) {
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return &PGReplicationSlotCollector{log: logger}, nil
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}
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var pgReplicationSlot = map[string]*prometheus.Desc{
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"current_wal_lsn": prometheus.NewDesc(
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"pg_replication_slot_current_wal_lsn",
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"current wal lsn value",
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[]string{"slot_name"}, nil,
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),
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"confirmed_flush_lsn": prometheus.NewDesc(
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"pg_replication_slot_confirmed_flush_lsn",
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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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"is_active": prometheus.NewDesc(
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"pg_replication_slot_is_active",
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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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}
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func (PGReplicationSlotCollector) Update(ctx context.Context, db *sql.DB, ch chan<- prometheus.Metric) error {
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rows, err := db.QueryContext(ctx,
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`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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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 slot_name string
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var wal_lsn int64
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var flush_lsn int64
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var is_active int
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if err := rows.Scan(&slot_name, &wal_lsn, &flush_lsn, &is_active); err != nil {
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return err
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}
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ch <- prometheus.MustNewConstMetric(
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pgReplicationSlot["current_wal_lsn"],
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prometheus.GaugeValue, float64(wal_lsn), slot_name,
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)
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if (is_active == 1) {
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ch <- prometheus.MustNewConstMetric(
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pgReplicationSlot["confirmed_flush_lsn"],
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prometheus.GaugeValue, float64(flush_lsn), slot_name,
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)
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}
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ch <- prometheus.MustNewConstMetric(
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pgReplicationSlot["is_active"],
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prometheus.GaugeValue, int(flush_lsn), slot_name,
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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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