mirror of
https://github.com/prometheus-community/postgres_exporter
synced 2025-04-01 22:48:15 +00:00
fab8e625a8
* Move errcheck exclude list to config file. * Enable revive linter * Fix up revive linting issues. Signed-off-by: SuperQ <superq@gmail.com>
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(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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"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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pgReplicationSlotCurrentFlushDesc = 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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pgReplicationSlotIsActiveDesc = 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 slotName string
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var walLSN int64
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var flusLSN int64
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var isActive bool
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if err := rows.Scan(&slotName, &walLSN, &flusLSN, &isActive); err != nil {
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return err
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}
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ch <- prometheus.MustNewConstMetric(
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pgReplicationSlotCurrentWalDesc,
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prometheus.GaugeValue, float64(walLSN), slotName,
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)
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if isActive {
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ch <- prometheus.MustNewConstMetric(
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pgReplicationSlotCurrentFlushDesc,
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prometheus.GaugeValue, float64(flusLSN), slotName,
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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, float64(flusLSN), slotName,
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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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