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pihole_exporter.go
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pihole_exporter.go
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// Copyright (C) 2016-2018 Nicolas Lamirault <[email protected]>
// 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 (
"flag"
"fmt"
"net/http"
"os"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/common/log"
"github.com/nlamirault/pihole_exporter/exporter"
"github.com/nlamirault/pihole_exporter/version"
)
const (
banner = "pihole_exporter - %s\n"
)
var (
debug bool
vrs bool
listenAddress string
metricsPath string
endpoint string
username string
password string
ids string
)
func init() {
// parse flags
flag.BoolVar(&vrs, "version", false, "print version and exit")
flag.StringVar(&listenAddress, "web.listen-address", ":9311", "Address to listen on for web interface and telemetry.")
flag.StringVar(&metricsPath, "web.telemetry-path", "/metrics", "Path under which to expose metrics.")
flag.StringVar(&endpoint, "pihole", "", "Endpoint of Pihole")
flag.Usage = func() {
fmt.Fprint(os.Stderr, fmt.Sprintf(banner, version.Version))
flag.PrintDefaults()
}
flag.Parse()
if vrs {
fmt.Printf("%s", version.Version)
os.Exit(0)
}
if len(endpoint) == 0 {
usageAndExit("Pihole endpoint cannot be empty.", 1)
}
}
func main() {
exporter, err := exporter.NewExporter(endpoint)
if err != nil {
log.Errorf("Can't create exporter : %s", err)
os.Exit(1)
}
log.Infoln("Register exporter")
prometheus.MustRegister(exporter)
http.Handle(metricsPath, prometheus.Handler())
http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
w.Write([]byte(`<html>
<head><title>Pihole Exporter</title></head>
<body>
<h1>Pihole Exporter</h1>
<p><a href='` + metricsPath + `'>Metrics</a></p>
</body>
</html>`))
})
log.Infoln("Listening on", listenAddress)
log.Fatal(http.ListenAndServe(listenAddress, nil))
}
func usageAndExit(message string, exitCode int) {
if message != "" {
fmt.Fprintf(os.Stderr, message)
fmt.Fprintf(os.Stderr, "\n")
}
flag.Usage()
os.Exit(exitCode)
}