add configure file support

cmd/gost/main.go

@@ -2,51 +2,64 @@ package main
 
 import (
 	"crypto/tls"
+	"encoding/json"
 	"flag"
 	"fmt"
 	"github.com/ginuerzh/gost"
 	"github.com/golang/glog"
 	"golang.org/x/net/http2"
+	"io/ioutil"
 	"os"
 	"runtime"
 	"sync"
 )
 
 var (
-	chainNodes  stringlist
-	serverNodes stringlist
-	pv          bool
+	options struct {
+		ChainNodes, ServeNodes flagStringList
+	}
 )
 
 func init() {
-	flag.Var(&serverNodes, "L", "listen address, can listen on multiple ports")
-	flag.Var(&chainNodes, "F", "forward address, can make a forward chain")
-	flag.BoolVar(&pv, "V", false, "print version")
+	var (
+		configureFile string
+		printVersion  bool
+	)
+
+	flag.StringVar(&configureFile, "C", "", "configure file")
+	flag.Var(&options.ChainNodes, "F", "forward address, can make a forward chain")
+	flag.Var(&options.ServeNodes, "L", "listen address, can listen on multiple ports")
+	flag.BoolVar(&printVersion, "V", false, "print version")
 	flag.Parse()
 
+	if err := loadConfigureFile(configureFile); err != nil {
+		glog.Fatal(err)
+	}
+
 	if glog.V(5) {
 		http2.VerboseLogs = true
 	}
-}
 
-func main() {
 	if flag.NFlag() == 0 {
 		flag.PrintDefaults()
 		return
 	}
-	if pv {
-		fmt.Fprintf(os.Stderr, "gost %s (%s)\n", gost.Version, runtime.Version())
+
+	if printVersion {
+		fmt.Fprintf(os.Stderr, "GOST %s (%s)\n", gost.Version, runtime.Version())
 		return
 	}
+}
 
+func main() {
 	chain := gost.NewProxyChain()
-	if err := chain.AddProxyNodeString(chainNodes...); err != nil {
+	if err := chain.AddProxyNodeString(options.ChainNodes...); err != nil {
 		glog.Fatal(err)
 	}
 	chain.Init()
 
 	var wg sync.WaitGroup
-	for _, ns := range serverNodes {
+	for _, ns := range options.ServeNodes {
 		serverNode, err := gost.ParseProxyNode(ns)
 		if err != nil {
 			glog.Fatal(err)
@@ -73,12 +86,26 @@ func main() {
 	wg.Wait()
 }
 
-type stringlist []string
-
-func (list *stringlist) String() string {
-	return fmt.Sprintf("%s", *list)
-}
-func (list *stringlist) Set(value string) error {
-	*list = append(*list, value)
+func loadConfigureFile(configureFile string) error {
+	if configureFile == "" {
+		return nil
+	}
+	content, err := ioutil.ReadFile(configureFile)
+	if err != nil {
+		return err
+	}
+	if err := json.Unmarshal(content, &options); err != nil {
+		return err
+	}
+	return nil
+}
+
+type flagStringList []string
+
+func (this *flagStringList) String() string {
+	return fmt.Sprintf("%s", *this)
+}
+func (this *flagStringList) Set(value string) error {
+	*this = append(*this, value)
 	return nil
 }