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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 (
"net/http"
"os"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/client_golang/prometheus/collectors"
versioncollector "github.com/prometheus/client_golang/prometheus/collectors/version"
"github.com/prometheus/client_golang/prometheus/promhttp"
"github.com/prometheus/common/promslog"
"github.com/prometheus/common/promslog/flag"
"github.com/prometheus/common/version"
"github.com/prometheus/exporter-toolkit/web"
"github.com/prometheus/exporter-toolkit/web/kingpinflag"
"gopkg.in/alecthomas/kingpin.v2"
)
const namespace = "pgbouncer"
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.`
promslogConfig := &promslog.Config{}
flag.AddFlags(kingpin.CommandLine, promslogConfig)
var (
connectionStringPointer = kingpin.Flag("pgBouncer.connectionString", "Connection string for accessing pgBouncer.").Default("postgres://postgres:@localhost:6543/pgbouncer?sslmode=disable").Envar("PGBOUNCER_EXPORTER_CONNECTION_STRING").String()
metricsPath = kingpin.Flag("web.telemetry-path", "Path under which to expose metrics.").Default("/metrics").String()
pidFilePath = kingpin.Flag("pgBouncer.pid-file", pidFileHelpText).Default("/run/postgresql/pgbouncer.pid").String()
)
toolkitFlags := kingpinflag.AddFlags(kingpin.CommandLine, ":9127")
kingpin.Version(version.Print("pgbouncer_exporter"))
kingpin.HelpFlag.Short('h')
kingpin.Parse()
logger := promslog.New(promslogConfig)
logger.Info("Starting pgbouncer_exporter", "version", version.Info())
logger.Info("Build context", "build_context", version.BuildContext())
connectionString := *connectionStringPointer
exporter := NewExporter(connectionString, namespace, logger)
if exporter == nil {
logger.Error("Failed to create exporter")
os.Exit(1)
}
prometheus.MustRegister(exporter)
prometheus.MustRegister(versioncollector.NewCollector("pgbouncer_exporter"))
if *pidFilePath != "" {
procExporter := collectors.NewProcessCollector(
collectors.ProcessCollectorOpts{
PidFn: prometheus.NewPidFileFn(*pidFilePath),
Namespace: namespace,
},
)
prometheus.MustRegister(procExporter)
}
http.Handle(*metricsPath, promhttp.Handler())
if *metricsPath != "/" && *metricsPath != "" {
landingConfig := web.LandingConfig{
Name: "PgBouncer Exporter",
Description: "Prometheus Exporter for PgBouncer servers",
Version: version.Info(),
Links: []web.LandingLinks{
{
Address: *metricsPath,
Text: "Metrics",
},
},
}
landingPage, err := web.NewLandingPage(landingConfig)
if err != nil {
logger.Error("Error creating landing page", "err", err)
os.Exit(1)
}
http.Handle("/", landingPage)
}
srv := &http.Server{}
if err := web.ListenAndServe(srv, toolkitFlags, logger); err != nil {
logger.Error("Error starting server", "err", err)
os.Exit(1)
}
}
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