Added command-line options for configuring the server

gostatsd/gostatsd.go

 package main
 
 import (
-	"log"
+	"flag"
+	"fmt"
 	"github.com/kisielk/gostatsd/statsd"
+	"log"
+	"os"
+)
+
+var (
+	metricsAddr string
+	consoleAddr string
+	graphiteAddr string
 )
 
+func init() {
+	const (
+		defaultMetricsAddr = ":8125"
+		defaultConsoleAddr = ":8126"
+		defaultGraphiteAddr = ""
+	)
+	flag.StringVar(&metricsAddr, "l", defaultMetricsAddr, "Address on which to listen for metrics (optional)")
+	flag.StringVar(&consoleAddr, "c", defaultConsoleAddr, "Address on which to listen for console sessions (optional)")
+	flag.StringVar(&graphiteAddr, "g", defaultGraphiteAddr, "Address of the graphite server (required)")
+}
+
 func main() {
-	err := statsd.ListenAndServe(":8125", ":8126", "localhost:1234")
+	flag.Parse()
+	if graphiteAddr == "" {
+		fmt.Printf("Error: You must provide the address of the graphite server with the -g flag\n")
+		fmt.Fprintf(os.Stderr, "Usage of %s:\n", os.Args[0])
+		flag.PrintDefaults()
+		return
+	}
+	err := statsd.ListenAndServe(metricsAddr, consoleAddr, graphiteAddr)
 	if err != nil {
 		log.Fatal(err)
 	}