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https://github.com/prometheus-community/postgres_exporter
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713461df98
- Remove multi server support from new collector package - Add http handler for multi-target support Signed-off-by: Joe Adams <github@joeadams.io>
71 lines
1.7 KiB
Go
71 lines
1.7 KiB
Go
// Copyright 2022 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("database", defaultEnabled, NewPGDatabaseCollector)
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}
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type PGDatabaseCollector struct {
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log log.Logger
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}
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func NewPGDatabaseCollector(logger log.Logger) (Collector, error) {
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return &PGDatabaseCollector{log: logger}, nil
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}
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var pgDatabase = map[string]*prometheus.Desc{
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"size_bytes": prometheus.NewDesc(
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"pg_database_size_bytes",
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"Disk space used by the database",
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[]string{"datname"}, nil,
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),
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}
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func (PGDatabaseCollector) 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 pg_database.datname
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,pg_database_size(pg_database.datname)
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FROM pg_database;`)
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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 datname string
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var size int64
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if err := rows.Scan(&datname, &size); err != nil {
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return err
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}
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ch <- prometheus.MustNewConstMetric(
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pgDatabase["size_bytes"],
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prometheus.GaugeValue, float64(size), datname,
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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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