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package main
import (
"crypto/md5"
"encoding/hex"
"github.com/golang/protobuf/proto"
"github.com/ry/v8worker2"
"io/ioutil"
"os"
"path"
"runtime"
)
func SourceCodeHash(filename string, sourceCodeBuf []byte) string {
h := md5.New()
h.Write([]byte(filename))
h.Write(sourceCodeBuf)
return hex.EncodeToString(h.Sum(nil))
}
func CacheFileName(filename string, sourceCodeBuf []byte) string {
cacheKey := SourceCodeHash(filename, sourceCodeBuf)
return path.Join(CompileDir, cacheKey+".js")
}
func HandleSourceCodeFetch(filename string) []byte {
res := &Msg{Kind: Msg_SOURCE_CODE_FETCH_RES}
sourceCodeBuf, err := Asset("dist/" + filename)
if err != nil {
sourceCodeBuf, err = ioutil.ReadFile(filename)
}
if err != nil {
res.Error = err.Error()
} else {
cacheFn := CacheFileName(filename, sourceCodeBuf)
outputCodeBuf, err := ioutil.ReadFile(cacheFn)
var outputCode string
if os.IsNotExist(err) {
outputCode = ""
} else if err != nil {
res.Error = err.Error()
} else {
outputCode = string(outputCodeBuf)
}
res.Payload = &Msg_SourceCodeFetchRes{
SourceCodeFetchRes: &SourceCodeFetchResMsg{
SourceCode: string(sourceCodeBuf),
OutputCode: outputCode,
},
}
}
out, err := proto.Marshal(res)
check(err)
return out
}
func HandleSourceCodeCache(filename string, sourceCode string,
outputCode string) []byte {
fn := CacheFileName(filename, []byte(sourceCode))
outputCodeBuf := []byte(outputCode)
err := ioutil.WriteFile(fn, outputCodeBuf, 0600)
res := &Msg{Kind: Msg_DATA_RESPONSE}
if err != nil {
res.Error = err.Error()
}
out, err := proto.Marshal(res)
check(err)
return out
}
func ReadFileSync(filename string) []byte {
buf, err := ioutil.ReadFile(filename)
msg := &Msg{Kind: Msg_DATA_RESPONSE}
if err != nil {
msg.Error = err.Error()
} else {
msg.Data = buf
}
out, err := proto.Marshal(msg)
check(err)
return out
}
func UserHomeDir() string {
if runtime.GOOS == "windows" {
home := os.Getenv("HOMEDRIVE") + os.Getenv("HOMEPATH")
if home == "" {
home = os.Getenv("USERPROFILE")
}
return home
}
return os.Getenv("HOME")
}
func loadAsset(w *v8worker2.Worker, path string) {
data, err := Asset(path)
check(err)
err = w.Load(path, string(data))
check(err)
}
var DenoDir string
var CompileDir string
var SrcDir string
func createDirs() {
DenoDir = path.Join(UserHomeDir(), ".deno")
CompileDir = path.Join(DenoDir, "compile")
err := os.MkdirAll(CompileDir, 0700)
check(err)
SrcDir = path.Join(DenoDir, "src")
err = os.MkdirAll(SrcDir, 0700)
check(err)
}
func check(e error) {
if e != nil {
panic(e)
}
}
func recv(buf []byte) []byte {
msg := &Msg{}
err := proto.Unmarshal(buf, msg)
check(err)
switch msg.Kind {
case Msg_READ_FILE_SYNC:
return ReadFileSync(msg.Path)
case Msg_EXIT:
os.Exit(int(msg.Code))
case Msg_SOURCE_CODE_FETCH:
payload := msg.GetSourceCodeFetch()
return HandleSourceCodeFetch(payload.Filename)
case Msg_SOURCE_CODE_CACHE:
payload := msg.GetSourceCodeCache()
return HandleSourceCodeCache(payload.Filename, payload.SourceCode, payload.OutputCode)
default:
panic("Unexpected message")
}
return nil
}
func main() {
args := v8worker2.SetFlags(os.Args)
createDirs()
worker := v8worker2.New(recv)
loadAsset(worker, "dist/main.js")
cwd, err := os.Getwd()
check(err)
out, err := proto.Marshal(&Msg{
Kind: Msg_START,
Payload: &Msg_Start{
Start: &StartMsg{
Cwd: cwd,
Argv: args,
},
},
})
check(err)
err = worker.SendBytes(out)
if err != nil {
os.Stderr.WriteString(err.Error())
os.Exit(1)
}
}
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