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main.go
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package main
import (
"fmt"
"net/http"
collect "github.com/gandi/xenlight_exporter/pkg/collectors"
"github.com/go-kit/log/level"
"github.com/prometheus/client_golang/prometheus"
"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"
"xenbits.xenproject.org/git-http/xen.git/tools/golang/xenlight"
)
func init() {
ctx, err := xenlight.NewContext()
if err != nil {
panic(err.Error())
}
registerCollector(collect.NewDomainCollector(ctx))
registerCollector(collect.NewPhysicalCollector(ctx))
registerCollector(collect.NewVersionCollector(ctx))
}
type registeredCollector struct {
enabled *bool
factory func() prometheus.Collector
}
var availableCollectors = make([]registeredCollector, 0)
func registerCollector(collector collect.XenPromCollector) {
var helpDefaultState string
if collector.DefaultEnabled() {
helpDefaultState = "enabled"
} else {
helpDefaultState = "disabled"
}
flagName := fmt.Sprintf("collector.%s", collector)
flagHelp := fmt.Sprintf("Enable the %s collector (default: %s).", collector, helpDefaultState)
defaultValue := fmt.Sprintf("%t", collector.DefaultEnabled())
flag := kingpin.Flag(flagName, flagHelp).Default(defaultValue).Bool()
availableCollectors = append(availableCollectors, registeredCollector{
enabled: flag,
factory: collector.PromCollector,
})
}
func main() {
var (
listenAddress = kingpin.Flag("web.listen-address", "Address on which to expose metrics and web interface.").Default(":9603").String()
metricsPath = kingpin.Flag("web.telemetry-path", "Path under which to expose metrics.").Default("/metrics").String()
)
logCfg := new(promlog.Config)
flag.AddFlags(kingpin.CommandLine, logCfg)
kingpin.Version(version.Print("xenlight_exporter"))
kingpin.HelpFlag.Short('h')
kingpin.Parse()
logger := promlog.New(logCfg)
reg := prometheus.NewPedanticRegistry()
reg.MustRegister(
prometheus.NewProcessCollector(prometheus.ProcessCollectorOpts{}),
prometheus.NewGoCollector(),
)
for _, col := range availableCollectors {
if *col.enabled {
reg.MustRegister(col.factory())
}
}
http.Handle(*metricsPath, promhttp.HandlerFor(reg, promhttp.HandlerOpts{}))
http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
_, err := w.Write([]byte(`<html>
<head><title>ctld Exporter</title></head>
<body>
<h1>ctld Exporter</h1>
<p><a href="` + *metricsPath + `">Metrics</a></p>
</body>
</html>`))
if err != nil {
level.Error(logger).Log(err)
}
})
level.Info(logger).Log("Listening on", *listenAddress)
level.Error(logger).Log(http.ListenAndServe(*listenAddress, nil))
}