Support using deno as a library

Author: ry

Makefile

@@ -18,6 +18,7 @@ TS_FILES = \
 	v8worker2.d.ts
 
 GO_FILES = \
+	cmd/main.go \
 	assets.go \
 	deno_dir.go \
 	deno_dir_test.go \
@@ -31,13 +32,14 @@ GO_FILES = \
 	timers.go \
 	util.go
 
+
 deno: msg.pb.go $(GO_FILES)
-	go build -o deno
+	go build -o deno ./cmd
 
 assets.go: dist/main.js
 	cp node_modules/typescript/lib/lib.*d.ts dist/
 	cp deno.d.ts dist/
-	go-bindata -pkg main -o assets.go dist/
+	go-bindata -pkg deno -o assets.go dist/
 
 msg.pb.go: msg.proto
 	protoc --go_out=. msg.proto

README.md

@@ -40,6 +40,9 @@ A JavaScript runtime using V8 6.8 and Go.
 
 * Aims to be browser compatible.
 
+* Can be used as a library to easily build your own JavaScript runtime.
+	https://github.com/ry/deno/blob/master/cmd/main.go
+
 
 ## Status
 

cmd/main.go

@@ -0,0 +1,13 @@
+// Copyright 2018 Ryan Dahl <[email protected]>
+// All rights reserved. MIT License.
+package main
+
+import (
+	"github.com/ry/deno"
+)
+
+func main() {
+	deno.Init()
+	deno.Eval("deno_main.js", "denoMain()")
+	deno.Loop()
+}

deno_dir.go

@@ -1,6 +1,6 @@
 // Copyright 2018 Ryan Dahl <[email protected]>
 // All rights reserved. MIT License.
-package main
+package deno
 
 import (
 	"crypto/md5"

deno_dir_test.go

@@ -1,6 +1,6 @@
 // Copyright 2018 Ryan Dahl <[email protected]>
 // All rights reserved. MIT License.
-package main
+package deno
 
 import (
 	"io/ioutil"

dispatch.go

@@ -1,10 +1,9 @@
 // Copyright 2018 Ryan Dahl <[email protected]>
 // All rights reserved. MIT License.
-package main
+package deno
 
 import (
 	"github.com/golang/protobuf/proto"
-	"github.com/ry/v8worker2"
 	"sync"
 )
 
@@ -20,19 +19,10 @@ var stats struct {
 	v8workerBytesRecv int
 }
 
-// There is a single global worker for this process.
-// This file should be the only part of deno that directly access it, so that
-// all interaction with V8 can go through a single point.
-var worker *v8worker2.Worker
-
 var channels = make(map[string][]Subscriber)
 
 type Subscriber func(payload []byte) []byte
 
-func createWorker() {
-	worker = v8worker2.New(recv)
-}
-
 func recv(buf []byte) (response []byte) {
 	stats.v8workerRecv++
 	stats.v8workerBytesRecv += len(buf)

echo.go

@@ -1,6 +1,6 @@
 // Copyright 2018 Ryan Dahl <[email protected]>
 // All rights reserved. MIT License.
-package main
+package deno
 
 // For testing
 func InitEcho() {

fetch.go

@@ -1,6 +1,6 @@
 // Copyright 2018 Ryan Dahl <[email protected]>
 // All rights reserved. MIT License.
-package main
+package deno
 
 import (
 	"github.com/golang/protobuf/proto"

integration_test.go

@@ -1,6 +1,6 @@
 // Copyright 2018 Ryan Dahl <[email protected]>
 // All rights reserved. MIT License.
-package main
+package deno
 
 import (
 	"bytes"

main.go

@@ -1,6 +1,6 @@
 // Copyright 2018 Ryan Dahl <[email protected]>
 // All rights reserved. MIT License.
-package main
+package deno
 
 import (
 	"flag"
@@ -34,8 +34,16 @@ func FlagsParse() []string {
 	return args
 }
 
-func main() {
-	args := FlagsParse()
+// There is a single global worker for this process.
+// This file should be the only part of deno that directly access it, so that
+// all interaction with V8 can go through a single point.
+var worker *v8worker2.Worker
+var workerArgs []string
+var main_js string
+var main_map string
+
+func Init() {
+	workerArgs = FlagsParse()
 
 	// Maybe start Golang CPU profiler.
 	// Use --prof for profiling JS.
@@ -49,33 +57,36 @@ func main() {
 	}
 
 	createDirs()
-	createWorker()
-
 	InitOS()
 	InitEcho()
 	InitTimers()
 	InitFetch()
 
-	main_js := stringAsset("main.js")
+	worker = v8worker2.New(recv)
+
+	main_js = stringAsset("main.js")
 	err := worker.Load("/main.js", main_js)
 	exitOnError(err)
-	main_map := stringAsset("main.map")
-
-	cwd, err := os.Getwd()
-	check(err)
+	main_map = stringAsset("main.map")
+}
 
-	err = worker.Load("deno_main.js", "denoMain()")
+// It's up to library users to call
+// deno.Eval("deno_main.js", "denoMain()")
+func Eval(filename string, code string) {
+	err := worker.Load(filename, code)
 	exitOnError(err)
+}
 
-	var command = Msg_START // TODO use proto3
+func Loop() {
+	cwd, err := os.Getwd()
+	check(err)
 	PubMsg("start", &Msg{
-		Command:        command,
+		Command:        Msg_START,
 		StartCwd:       cwd,
-		StartArgv:      args,
+		StartArgv:      workerArgs,
 		StartDebugFlag: *flagDebug,
 		StartMainJs:    main_js,
 		StartMainMap:   main_map,
 	})
-
 	DispatchLoop()
 }