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main.go
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package main
import (
"context"
"fmt"
"net"
"net/http"
"os"
"time"
_ "net/http/pprof"
"github.com/go-kit/log"
"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/syepes/network_exporter/collector"
"github.com/syepes/network_exporter/config"
"github.com/syepes/network_exporter/monitor"
"github.com/syepes/network_exporter/pkg/common"
"gopkg.in/alecthomas/kingpin.v2"
)
const version string = "1.4.0"
var (
listenAddress = kingpin.Flag("web.listen-address", "The address to listen on for HTTP requests").Default(":9427").String()
configFile = kingpin.Flag("config.file", "Exporter configuration file").Default("/network_exporter.yml").String()
sc = &config.SafeConfig{Cfg: &config.Config{}}
logger log.Logger
icmpID *common.IcmpID // goroutine shared counter
monitorPING *monitor.PING
monitorMTR *monitor.MTR
monitorTCP *monitor.TCPPort
monitorHTTPGet *monitor.HTTPGet
indexHTML = `<!doctype html><html><head> <meta charset="UTF-8"><title>Network Exporter (Version ` + version + `)</title></head><body><h1>Network Exporter</h1><p><a href="%s">Metrics</a></p></body></html>`
)
func init() {
promlogConfig := &promlog.Config{}
flag.AddFlags(kingpin.CommandLine, promlogConfig)
kingpin.Version(version)
kingpin.HelpFlag.Short('h')
kingpin.Parse()
logger = promlog.New(promlogConfig)
icmpID = &common.IcmpID{}
}
func main() {
level.Info(logger).Log("msg", "Starting network_exporter", "version", version)
level.Info(logger).Log("msg", "Loading config")
if err := sc.ReloadConfig(*configFile); err != nil {
level.Error(logger).Log("msg", "Loading config", "err", err)
os.Exit(1)
}
reloadSignal()
resolver := getResolver()
monitorPING = monitor.NewPing(logger, sc, resolver, icmpID)
monitorPING.AddTargets()
monitorMTR = monitor.NewMTR(logger, sc, resolver, icmpID)
monitorMTR.AddTargets()
monitorTCP = monitor.NewTCPPort(logger, sc, resolver)
monitorTCP.AddTargets()
monitorHTTPGet = monitor.NewHTTPGet(logger, sc, resolver)
monitorHTTPGet.AddTargets()
go startConfigRefresh()
startServer()
}
func startConfigRefresh() {
interval := sc.Cfg.Conf.Refresh.Duration()
if interval <= 0 {
return
}
for range time.NewTicker(interval).C {
level.Info(logger).Log("msg", "ReLoading config")
if err := sc.ReloadConfig(*configFile); err != nil {
level.Error(logger).Log("msg", "Reloading config skipped", "err", err)
continue
} else {
monitorPING.AddTargets()
monitorPING.DelTargets()
monitorMTR.AddTargets()
monitorMTR.DelTargets()
monitorTCP.AddTargets()
monitorTCP.DelTargets()
monitorHTTPGet.AddTargets()
monitorHTTPGet.DelTargets()
}
}
}
func startServer() {
metricsPath := "/metrics"
level.Info(logger).Log("msg", "Starting ping exporter", "version", version)
http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
fmt.Fprintf(w, indexHTML, metricsPath)
})
reg := prometheus.NewRegistry()
reg.MustRegister(collectors.NewGoCollector())
reg.MustRegister(collectors.NewProcessCollector(collectors.ProcessCollectorOpts{}))
reg.MustRegister(&collector.MTR{Monitor: monitorMTR})
reg.MustRegister(&collector.PING{Monitor: monitorPING})
reg.MustRegister(&collector.TCP{Monitor: monitorTCP})
reg.MustRegister(&collector.HTTPGet{Monitor: monitorHTTPGet})
h := promhttp.HandlerFor(reg, promhttp.HandlerOpts{})
http.Handle(metricsPath, h)
level.Info(logger).Log("msg", fmt.Sprintf("Listening for %s on %s", metricsPath, *listenAddress))
level.Error(logger).Log("msg", "Could not start http", "err", http.ListenAndServe(*listenAddress, nil))
}
func getResolver() *net.Resolver {
if sc.Cfg.Conf.Nameserver == "" {
level.Info(logger).Log("msg", "Configured default DNS resolver")
return net.DefaultResolver
}
level.Info(logger).Log("msg", "Configured custom DNS resolver")
dialer := func(ctx context.Context, network, address string) (net.Conn, error) {
d := net.Dialer{Timeout: 3 * time.Second}
return d.DialContext(ctx, "udp", sc.Cfg.Conf.Nameserver)
}
return &net.Resolver{PreferGo: true, Dial: dialer}
}