add cmd directory

.gitignore

@@ -25,7 +25,7 @@ config.json
 *.log
 *.swp
 *.gz
-godns
+cmd/godns/godns
 
 vendor/*
 /.idea

cmd/godns/godns.go

@@ -0,0 +1,70 @@
+package main
+
+import (
+	"flag"
+	"fmt"
+	"log"
+	"os"
+
+	"github.com/TimothyYe/godns"
+	"github.com/TimothyYe/godns/handler"
+)
+
+const ()
+
+var (
+	configuration godns.Settings
+	optConf       = flag.String("c", "./config.json", "Specify a config file")
+	optHelp       = flag.Bool("h", false, "Show help")
+)
+
+func main() {
+	flag.Parse()
+	if *optHelp {
+		flag.Usage()
+		return
+	}
+
+	// Load settings from configurations file
+	if err := godns.LoadSettings(*optConf, &configuration); err != nil {
+		fmt.Println(err.Error())
+		log.Println(err.Error())
+		os.Exit(1)
+	}
+
+	if err := godns.CheckSettings(&configuration); err != nil {
+		log.Println("Settings is invalid! ", err.Error())
+		os.Exit(1)
+	}
+
+	if err := godns.InitLogger(configuration.LogPath, configuration.LogSize, configuration.LogNum); err != nil {
+		log.Println("InitLogger error:", err.Error())
+		os.Exit(1)
+	}
+
+	dnsLoop()
+}
+
+func dnsLoop() {
+	panicChan := make(chan godns.Domain)
+
+	handler := handler.CreateHandler(configuration.Provider)
+	handler.SetConfiguration(&configuration)
+	for _, domain := range configuration.Domains {
+		go handler.DomainLoop(&domain, panicChan)
+	}
+
+	panicCount := 0
+	for {
+		select {
+		case failDomain := <-panicChan:
+			log.Println("Got panic in goroutine, will start a new one... :", panicCount)
+			go handler.DomainLoop(&failDomain, panicChan)
+		}
+
+		panicCount++
+		if panicCount >= godns.PanicMax {
+			os.Exit(1)
+		}
+	}
+}