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Switch to kingpin for flag handling

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This commit also removs the deprecated -statsd.listen-address flag. Switching
to kingpin is a breaking change in that flags now start with two hyphens (e.g.
--statsd.listen-udp), and thus a good time to remove deprecated flags.

Signed-off-by: Nic Cope <negz@planet.com>
This commit is contained in:
Nic Cope 2018-08-20 13:12:45 -07:00
parent 84f1ef33d4
commit fcc398a032
1 changed files with 18 additions and 29 deletions
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47
main.go
View file

@ -14,17 +14,15 @@
package main
import (
"flag"
"fmt"
"net"
"net/http"
"os"
"strconv"
"github.com/howeyc/fsnotify"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/common/log"
"github.com/prometheus/common/version"
"gopkg.in/alecthomas/kingpin.v2"
"github.com/prometheus/statsd_exporter/pkg/mapper"
)
@ -33,29 +31,18 @@ func init() {
prometheus.MustRegister(version.NewCollector("statsd_exporter"))
}
var (
listenAddress = flag.String("web.listen-address", ":9102", "The address on which to expose the web interface and generated Prometheus metrics.")
metricsEndpoint = flag.String("web.telemetry-path", "/metrics", "Path under which to expose metrics.")
statsdListenAddress = flag.String("statsd.listen-address", "", "The UDP address on which to receive statsd metric lines. DEPRECATED, use statsd.listen-udp instead.")
statsdListenUDP = flag.String("statsd.listen-udp", ":9125", "The UDP address on which to receive statsd metric lines. \"\" disables it.")
statsdListenTCP = flag.String("statsd.listen-tcp", ":9125", "The TCP address on which to receive statsd metric lines. \"\" disables it.")
mappingConfig = flag.String("statsd.mapping-config", "", "Metric mapping configuration file name.")
readBuffer = flag.Int("statsd.read-buffer", 0, "Size (in bytes) of the operating system's transmit read buffer associated with the UDP connection. Please make sure the kernel parameters net.core.rmem_max is set to a value greater than the value specified.")
showVersion = flag.Bool("version", false, "Print version information.")
)
func serveHTTP() {
http.Handle(*metricsEndpoint, prometheus.Handler())
func serveHTTP(listenAddress, metricsEndpoint string) {
http.Handle(metricsEndpoint, prometheus.Handler())
http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
w.Write([]byte(`<html>
<head><title>StatsD Exporter</title></head>
<body>
<h1>StatsD Exporter</h1>
<p><a href="` + *metricsEndpoint + `">Metrics</a></p>
<p><a href="` + metricsEndpoint + `">Metrics</a></p>
</body>
</html>`))
})
log.Fatal(http.ListenAndServe(*listenAddress, nil))
log.Fatal(http.ListenAndServe(listenAddress, nil))
}
func ipPortFromString(addr string) (*net.IPAddr, int) {
@ -132,17 +119,19 @@ func watchConfig(fileName string, mapper *mapper.MetricMapper) {
}
func main() {
flag.Parse()
var (
listenAddress = kingpin.Flag("web.listen-address", "The address on which to expose the web interface and generated Prometheus metrics.").Default(":9102").String()
metricsEndpoint = kingpin.Flag("web.telemetry-path", "Path under which to expose metrics.").Default("/metrics").String()
statsdListenUDP = kingpin.Flag("statsd.listen-udp", "The UDP address on which to receive statsd metric lines. \"\" disables it.").Default(":9125").String()
statsdListenTCP = kingpin.Flag("statsd.listen-tcp", "The TCP address on which to receive statsd metric lines. \"\" disables it.").Default(":9125").String()
mappingConfig = kingpin.Flag("statsd.mapping-config", "Metric mapping configuration file name.").String()
readBuffer = kingpin.Flag("statsd.read-buffer", "Size (in bytes) of the operating system's transmit read buffer associated with the UDP connection. Please make sure the kernel parameters net.core.rmem_max is set to a value greater than the value specified.").Int()
)
if *showVersion {
fmt.Fprintln(os.Stdout, version.Print("statsd_exporter"))
os.Exit(0)
}
if *statsdListenAddress != "" {
log.Warnln("Warning: statsd.listen-address is DEPRECATED, please use statsd.listen-udp instead.")
*statsdListenUDP = *statsdListenAddress
}
log.AddFlags(kingpin.CommandLine)
kingpin.Version(version.Print("statsd_exporter"))
kingpin.HelpFlag.Short('h')
kingpin.Parse()
if *statsdListenUDP == "" && *statsdListenTCP == "" {
log.Fatalln("At least one of UDP/TCP listeners must be specified.")
@ -153,7 +142,7 @@ func main() {
log.Infof("Accepting StatsD Traffic: UDP %v, TCP %v", *statsdListenUDP, *statsdListenTCP)
log.Infoln("Accepting Prometheus Requests on", *listenAddress)
go serveHTTP()
go serveHTTP(*listenAddress, *metricsEndpoint)
events := make(chan Events, 1024)
defer close(events)