Use proto2 instead of proto3

Travis doesn't support proto3.

dispatch.go

@@ -23,9 +23,9 @@ func recv(buf []byte) (response []byte) {
 	msg := &BaseMsg{}
 	check(proto.Unmarshal(buf, msg))
 	assert(len(msg.Payload) > 0, "BaseMsg has empty payload.")
-	subscribers, ok := channels[msg.Channel]
+	subscribers, ok := channels[*msg.Channel]
 	if !ok {
-		panic("No subscribers for channel " + msg.Channel)
+		panic("No subscribers for channel " + *msg.Channel)
 	}
 	for i := 0; i < len(subscribers); i++ {
 		s := subscribers[i]
@@ -48,7 +48,7 @@ func Sub(channel string, cb Subscriber) {
 
 func Pub(channel string, payload []byte) {
 	resChan <- &BaseMsg{
-		Channel: channel,
+		Channel: &channel,
 		Payload: payload,
 	}
 }

main.go

@@ -83,11 +83,11 @@ func main() {
 	out, err := proto.Marshal(&Msg{
 		Payload: &Msg_Start{
 			Start: &StartMsg{
-				Cwd:       cwd,
+				Cwd:       &cwd,
 				Argv:      args,
-				DebugFlag: *flagDebug,
-				MainJs:    main_js,
-				MainMap:   main_map,
+				DebugFlag: flagDebug,
+				MainJs:    &main_js,
+				MainMap:   &main_map,
 			},
 		},
 	})

msg.proto

@@ -1,13 +1,13 @@
-syntax = "proto3";
+syntax = "proto2";
 package main;
 
 message BaseMsg {
-  string channel = 1;
-  bytes payload = 2;
+  optional string channel = 1;
+  optional bytes payload = 2;
 }
 
 message Msg {
-  string error = 1;
+  optional string error = 1;
   oneof payload {
     StartMsg start = 10;
     SourceCodeFetchMsg source_code_fetch = 11;
@@ -20,43 +20,43 @@ message Msg {
 }
 
 message StartMsg {
-  string cwd = 1;
+  optional string cwd = 1;
   repeated string argv = 2;
-  bool debug_flag = 3;
-  string main_js = 4;  // The contents of dist/main.js
-  string main_map = 5; // The contents of dist/main.map
+  optional bool debug_flag = 3;
+  optional string main_js = 4;  // The contents of dist/main.js
+  optional string main_map = 5; // The contents of dist/main.map
 }
 
 message SourceCodeFetchMsg {
-  string module_specifier = 1;
-  string containing_file = 2;
+  optional string module_specifier = 1;
+  optional string containing_file = 2;
 }
 
 message SourceCodeFetchResMsg {
   // If it's a non-http module, moduleName and filename will be the same.
   // For http modules, moduleName is its resolved http URL, and filename
   // is the location of the locally downloaded source code.
-  string moduleName = 1;
-  string filename = 2;
-  string source_code = 3;
-  string output_code = 4; // Non-empty only if cached.
+  optional string moduleName = 1;
+  optional string filename = 2;
+  optional string source_code = 3;
+  optional string output_code = 4; // Non-empty only if cached.
 }
 
 message SourceCodeCacheMsg {
-  string filename = 1;
-  string source_code = 2;
-  string output_code = 3;
+  optional string filename = 1;
+  optional string source_code = 2;
+  optional string output_code = 3;
 }
 
-message ExitMsg { int32 code = 1; }
+message ExitMsg { optional int32 code = 1; }
 
 message TimerStartMsg {
-  int32 id = 1;
-  bool interval = 2;
-  int32 duration = 3; // In milliseconds.
+  optional int32 id = 1;
+  optional bool interval = 2;
+  optional int32 duration = 3; // In milliseconds.
 }
 
 message TimerReadyMsg {
-  int32 id = 1;
-  bool done = 2;
+  optional int32 id = 1;
+  optional bool done = 2;
 }

os.go

@@ -16,14 +16,14 @@ func InitOS() {
 		switch msg.Payload.(type) {
 		case *Msg_Exit:
 			payload := msg.GetExit()
-			os.Exit(int(payload.Code))
+			os.Exit(int(*payload.Code))
 		case *Msg_SourceCodeFetch:
 			payload := msg.GetSourceCodeFetch()
-			return HandleSourceCodeFetch(payload.ModuleSpecifier, payload.ContainingFile)
+			return HandleSourceCodeFetch(*payload.ModuleSpecifier, *payload.ContainingFile)
 		case *Msg_SourceCodeCache:
 			payload := msg.GetSourceCodeCache()
-			return HandleSourceCodeCache(payload.Filename, payload.SourceCode,
-				payload.OutputCode)
+			return HandleSourceCodeCache(*payload.Filename, *payload.SourceCode,
+				*payload.OutputCode)
 		default:
 			panic("[os] Unexpected message " + string(buf))
 		}
@@ -39,7 +39,8 @@ func HandleSourceCodeFetch(moduleSpecifier string, containingFile string) (out [
 
 	defer func() {
 		if err != nil {
-			res.Error = err.Error()
+			var errStr = err.Error()
+			res.Error = &errStr
 		}
 		out, err = proto.Marshal(res)
 		check(err)
@@ -72,12 +73,13 @@ func HandleSourceCodeFetch(moduleSpecifier string, containingFile string) (out [
 		return
 	}
 
+	var sourceCode = string(sourceCodeBuf)
 	res.Payload = &Msg_SourceCodeFetchRes{
 		SourceCodeFetchRes: &SourceCodeFetchResMsg{
-			ModuleName: moduleName,
-			Filename:   filename,
-			SourceCode: string(sourceCodeBuf),
-			OutputCode: outputCode,
+			ModuleName: &moduleName,
+			Filename:   &filename,
+			SourceCode: &sourceCode,
+			OutputCode: &outputCode,
 		},
 	}
 	return
@@ -91,7 +93,8 @@ func HandleSourceCodeCache(filename string, sourceCode string,
 	err := ioutil.WriteFile(fn, outputCodeBuf, 0600)
 	res := &Msg{}
 	if err != nil {
-		res.Error = err.Error()
+		var errStr = err.Error()
+		res.Error = &errStr
 	}
 	out, err := proto.Marshal(res)
 	check(err)

timers.go

@@ -12,7 +12,8 @@ func InitTimers() {
 		switch msg.Payload.(type) {
 		case *Msg_TimerStart:
 			payload := msg.GetTimerStart()
-			return HandleTimerStart(payload.Id, payload.Interval, payload.Duration)
+			return HandleTimerStart(*payload.Id, *payload.Interval,
+				*payload.Duration)
 		default:
 			panic("[timers] Unexpected message " + string(buf))
 		}
@@ -27,7 +28,7 @@ func HandleTimerStart(id int32, interval bool, duration int32) []byte {
 		payload, err := proto.Marshal(&Msg{
 			Payload: &Msg_TimerReady{
 				TimerReady: &TimerReadyMsg{
-					Id: id,
+					Id: &id,
 				},
 			},
 		})