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pgbouncer_exporter.go
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// Copyright 2020 The Prometheus Authors
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package main
import (
"fmt"
"net/http"
"os"
"github.com/go-kit/log/level"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/client_golang/prometheus/collectors"
"github.com/prometheus/client_golang/prometheus/promhttp"
"github.com/prometheus/common/promlog"
"github.com/prometheus/common/promlog/flag"
"github.com/prometheus/common/version"
"gopkg.in/alecthomas/kingpin.v2"
)
const (
namespace = "pgbouncer"
indexHTML = `
<html>
<head>
<title>PgBouncer Exporter</title>
</head>
<body>
<h1>PgBouncer Exporter</h1>
<p>
<a href='%s'>Metrics</a>
</p>
</body>
</html>`
)
func main() {
const pidFileHelpText = `Path to PgBouncer pid file.
If provided, the standard process metrics get exported for the PgBouncer
process, prefixed with 'pgbouncer_process_...'. The pgbouncer_process exporter
needs to have read access to files owned by the PgBouncer process. Depends on
the availability of /proc.
https://prometheus.io/docs/instrumenting/writing_clientlibs/#process-metrics.`
promlogConfig := &promlog.Config{}
flag.AddFlags(kingpin.CommandLine, promlogConfig)
var (
connectionStringPointer = kingpin.Flag("pgBouncer.connectionString", "Connection string for accessing pgBouncer.").Default("postgres://postgres:@localhost:6543/pgbouncer?sslmode=disable").String()
listenAddress = kingpin.Flag("web.listen-address", "Address on which to expose metrics and web interface.").Default(":9127").String()
metricsPath = kingpin.Flag("web.telemetry-path", "Path under which to expose metrics.").Default("/metrics").String()
pidFilePath = kingpin.Flag("pgBouncer.pid-file", pidFileHelpText).Default("").String()
)
kingpin.Version(version.Print("pgbouncer_exporter"))
kingpin.HelpFlag.Short('h')
kingpin.Parse()
logger := promlog.New(promlogConfig)
connectionString := *connectionStringPointer
exporter := NewExporter(connectionString, namespace, logger)
prometheus.MustRegister(exporter)
prometheus.MustRegister(version.NewCollector("pgbouncer_exporter"))
level.Info(logger).Log("msg", "Starting pgbouncer_exporter", "version", version.Info())
level.Info(logger).Log("msg", "Build context", "build_context", version.BuildContext())
if *pidFilePath != "" {
procExporter := collectors.NewProcessCollector(
collectors.ProcessCollectorOpts{
PidFn: prometheus.NewPidFileFn(*pidFilePath),
Namespace: namespace,
},
)
prometheus.MustRegister(procExporter)
}
http.Handle(*metricsPath, promhttp.Handler())
http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
w.Write([]byte(fmt.Sprintf(indexHTML, *metricsPath)))
})
level.Info(logger).Log("msg", "Listening on", "address", *listenAddress)
if err := http.ListenAndServe(*listenAddress, nil); err != nil {
level.Error(logger).Log("err", err)
os.Exit(1)
}
}