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package main
import (
"github.com/golang/protobuf/proto"
"io/ioutil"
"net/url"
"os"
"path"
"strings"
)
const assetPrefix string = "/$asset$/"
func InitOS() {
Sub("os", func(buf []byte) []byte {
msg := &Msg{}
check(proto.Unmarshal(buf, msg))
switch msg.Command {
case Msg_CODE_FETCH:
return HandleCodeFetch(
msg.CodeFetchModuleSpecifier,
msg.CodeFetchContainingFile)
case Msg_CODE_CACHE:
return HandleCodeCache(
msg.CodeCacheFilename,
msg.CodeCacheSourceCode,
msg.CodeCacheOutputCode)
case Msg_EXIT:
os.Exit(int(msg.ExitCode))
default:
panic("[os] Unexpected message " + string(buf))
}
return nil
})
}
func ResolveModule(moduleSpecifier string, containingFile string) (
moduleName string, filename string, err error) {
logDebug("ResolveModule %s %s", moduleSpecifier, containingFile)
moduleUrl, err := url.Parse(moduleSpecifier)
if err != nil {
return
}
baseUrl, err := url.Parse(containingFile)
if err != nil {
return
}
resolved := baseUrl.ResolveReference(moduleUrl)
moduleName = resolved.String()
if moduleUrl.IsAbs() {
filename = path.Join(SrcDir, resolved.Host, resolved.Path)
} else {
filename = resolved.Path
}
return
}
func HandleCodeFetch(moduleSpecifier string, containingFile string) (out []byte) {
assert(moduleSpecifier != "", "moduleSpecifier shouldn't be empty")
res := &Msg{}
var sourceCodeBuf []byte
var err error
defer func() {
if err != nil {
res.Error = err.Error()
}
out, err = proto.Marshal(res)
check(err)
}()
moduleName, filename, err := ResolveModule(moduleSpecifier, containingFile)
if err != nil {
return
}
logDebug("HandleCodeFetch moduleSpecifier %s containingFile %s filename %s",
moduleSpecifier, containingFile, filename)
if isRemote(moduleName) {
sourceCodeBuf, err = FetchRemoteSource(moduleName, filename)
} else if strings.HasPrefix(moduleName, assetPrefix) {
f := strings.TrimPrefix(moduleName, assetPrefix)
sourceCodeBuf, err = Asset("dist/" + f)
if err != nil {
logDebug("%s Asset doesn't exist. Return without error", moduleName)
err = nil
}
} else {
assert(moduleName == filename,
"if a module isn't remote, it should have the same filename")
sourceCodeBuf, err = ioutil.ReadFile(moduleName)
}
if err != nil {
return
}
outputCode, err := LoadOutputCodeCache(filename, sourceCodeBuf)
if err != nil {
return
}
var sourceCode = string(sourceCodeBuf)
var command = Msg_CODE_FETCH_RES
res = &Msg{
Command: command,
CodeFetchResModuleName: moduleName,
CodeFetchResFilename: filename,
CodeFetchResSourceCode: sourceCode,
CodeFetchResOutputCode: outputCode,
}
return
}
func HandleCodeCache(filename string, sourceCode string,
outputCode string) []byte {
fn := CacheFileName(filename, []byte(sourceCode))
outputCodeBuf := []byte(outputCode)
err := ioutil.WriteFile(fn, outputCodeBuf, 0600)
res := &Msg{}
if err != nil {
res.Error = err.Error()
}
out, err := proto.Marshal(res)
check(err)
return out
}
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