Switch golang flag's to allow for glog argument access

cmd/mc-router/main.go

@@ -2,27 +2,24 @@ package main
 
 import (
 	"context"
+	"flag"
 	"fmt"
-	"github.com/alecthomas/kingpin"
 	"github.com/itzg/mc-router/server"
 	"github.com/sirupsen/logrus"
 	"net"
 	"os"
 	"os/signal"
 	"strconv"
+	"strings"
 )
 
 var (
-	port = kingpin.Flag("port", "The port bound to listen for Minecraft client connections").
-		Default("25565").Int()
-	apiBinding = kingpin.Flag("api-binding", "The host:port bound for servicing API requests").
-			String()
-	mappings = kingpin.Flag("mapping", "Mapping of external hostname to internal server host:port").
-			StringMap()
-	versionFlag = kingpin.Flag("version", "Output version and exit").
-			Bool()
-	kubeConfigFile = kingpin.Flag("kube-config", "The path to a kubernetes configuration file").String()
-	inKubeCluster  = kingpin.Flag("in-kube-cluster", "Use in-cluster kubernetes config").Bool()
+	port           = flag.Int("port", 25565, "The port bound to listen for Minecraft client connections")
+	apiBinding     = flag.String("api-binding", "", "The host:port bound for servicing API requests")
+	mappings       = flag.String("mapping", "", "Comma-separated mappings of externalHostname=host:port")
+	versionFlag    = flag.Bool("version", false, "Output version and exit")
+	kubeConfigFile = flag.String("kube-config", "", "The path to a kubernetes configuration file")
+	inKubeCluster  = flag.Bool("in-kube-cluster", false, "Use in-cluster kubernetes config")
 )
 
 var (
@@ -36,7 +33,7 @@ func showVersion() {
 }
 
 func main() {
-	kingpin.Parse()
+	flag.Parse()
 
 	if *versionFlag {
 		showVersion()
@@ -48,7 +45,7 @@ func main() {
 	c := make(chan os.Signal, 1)
 	signal.Notify(c, os.Interrupt)
 
-	server.Routes.RegisterAll(*mappings)
+	server.Routes.RegisterAll(parseMappings(*mappings))
 
 	server.Connector.StartAcceptingConnections(ctx, net.JoinHostPort("", strconv.Itoa(*port)))
 
@@ -77,3 +74,19 @@ func main() {
 	logrus.Info("Stopping")
 	cancel()
 }
+
+func parseMappings(val string) map[string]string {
+	result := make(map[string]string)
+	if val != "" {
+		parts := strings.Split(val, ",")
+		for _, part := range parts {
+			keyValue := strings.Split(part, "=")
+			if len(keyValue) == 2 {
+				result[keyValue[0]] = keyValue[1]
+			}
+			logrus.WithField("part", part).Fatal("Invalid part of mapping")
+		}
+	}
+
+	return result
+}