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ondemand_exporter.go
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// MIT License
//
// Copyright (c) 2020 Ohio Supercomputer Center
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.
package main
import (
"log/slog"
"net/http"
"os"
"github.com/OSC/ondemand_exporter/collectors"
"github.com/alecthomas/kingpin/v2"
"github.com/prometheus/client_golang/prometheus"
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"
)
var (
listenAddr = kingpin.Flag("web.listen-address", "Address to listen on for web interface and telemetry.").Default(":9301").Envar("LISTEN_ADDRESS").String()
)
func metricsHandler(logger *slog.Logger) http.HandlerFunc {
return func(w http.ResponseWriter, r *http.Request) {
collector := collectors.NewCollector(logger)
registry := prometheus.NewRegistry()
registry.MustRegister(collector)
registry.MustRegister(versioncollector.NewCollector("ondemand_exporter"))
gatherers := prometheus.Gatherers{
prometheus.DefaultGatherer,
registry,
}
h := promhttp.HandlerFor(gatherers, promhttp.HandlerOpts{})
h.ServeHTTP(w, r)
}
}
func main() {
metricsEndpoint := "/metrics"
promslogConfig := &promslog.Config{}
flag.AddFlags(kingpin.CommandLine, promslogConfig)
kingpin.Version(version.Print("ondemand_exporter"))
kingpin.HelpFlag.Short('h')
kingpin.Parse()
logger := promslog.New(promslogConfig)
logger.Info("Starting ondemand_exporter", "version", version.Info())
logger.Info("Build context", "build_context", version.BuildContext())
logger.Info("Starting Server", "address", *listenAddr)
http.Handle(metricsEndpoint, metricsHandler(logger))
http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
w.Write([]byte(`<html>
<head><title>OnDemand Exporter</title></head>
<body>
<h1>OnDemand Exporter</h1>
<p><a href='` + metricsEndpoint + `'>Metrics</a></p>
</body>
</html>`))
})
err := http.ListenAndServe(*listenAddr, nil)
if err != nil {
logger.Error(err.Error())
os.Exit(1)
}
}