mirror of
https://github.com/prometheus-community/postgres_exporter
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e8540767e4
* ci: update go to version 1.23
Signed-off-by: TJ Hoplock <t.hoplock@gmail.com>
* build(deps): bump prometheus/{client_golang,common,exporter-toolkit}
Signed-off-by: TJ Hoplock <t.hoplock@gmail.com>
* chore!: adopt log/slog, drop go-kit/log
The bulk of this change set was automated by the following script which
is being used to aid in converting the various exporters/projects to use
slog:
https://gist.github.com/tjhop/49f96fb7ebbe55b12deee0b0312d8434
Signed-off-by: TJ Hoplock <t.hoplock@gmail.com>
---------
Signed-off-by: TJ Hoplock <t.hoplock@gmail.com>
Co-authored-by: Ben Kochie <superq@gmail.com>
92 lines
2.2 KiB
Go
92 lines
2.2 KiB
Go
// Copyright 2024 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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"log/slog"
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"github.com/prometheus/client_golang/prometheus"
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)
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const rolesSubsystem = "roles"
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func init() {
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registerCollector(rolesSubsystem, defaultEnabled, NewPGRolesCollector)
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}
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type PGRolesCollector struct {
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log *slog.Logger
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}
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func NewPGRolesCollector(config collectorConfig) (Collector, error) {
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return &PGRolesCollector{
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log: config.logger,
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}, nil
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}
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var (
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pgRolesConnectionLimitsDesc = prometheus.NewDesc(
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prometheus.BuildFQName(
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namespace,
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rolesSubsystem,
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"connection_limit",
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),
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"Connection limit set for the role",
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[]string{"rolname"}, nil,
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)
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pgRolesConnectionLimitsQuery = "SELECT pg_roles.rolname, pg_roles.rolconnlimit FROM pg_roles"
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)
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// Update implements Collector and exposes roles connection limits.
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// It is called by the Prometheus registry when collecting metrics.
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func (c PGRolesCollector) Update(ctx context.Context, instance *instance, ch chan<- prometheus.Metric) error {
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db := instance.getDB()
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// Query the list of databases
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rows, err := db.QueryContext(ctx,
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pgRolesConnectionLimitsQuery,
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)
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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 rolname sql.NullString
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var connLimit sql.NullInt64
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if err := rows.Scan(&rolname, &connLimit); err != nil {
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return err
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}
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if !rolname.Valid {
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continue
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}
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rolnameLabel := rolname.String
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if !connLimit.Valid {
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continue
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}
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connLimitMetric := float64(connLimit.Int64)
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ch <- prometheus.MustNewConstMetric(
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pgRolesConnectionLimitsDesc,
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prometheus.GaugeValue, connLimitMetric, rolnameLabel,
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)
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}
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return rows.Err()
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}
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