/
script.go
208 lines (167 loc) · 3.84 KB
/
script.go
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package common
import (
"fmt"
"github.com/dop251/goja"
"github.com/dop251/goja_nodejs/require"
"reflect"
"strconv"
"strings"
"time"
)
type ScriptEngine struct {
Registry *require.Registry
VM *goja.Runtime
program *goja.Program
}
func (c *gojaConsole) table(data interface{}) {
val, ok := data.(reflect.Value)
if !ok {
val = reflect.Indirect(reflect.ValueOf(data))
}
st := NewStringTable()
st.AddCols("field", "value")
switch val.Type().Kind() {
case reflect.Map:
iter := val.MapRange()
for iter.Next() {
k := iter.Key()
v := iter.Value()
st.AddCols(k, fmt.Sprintf("%+v", v.Elem()))
}
case reflect.Struct:
err := IterateStruct(data, func(fieldPath string, fieldType reflect.StructField, fieldValue reflect.Value) error {
st.AddCols(fieldPath, fmt.Sprintf("%+v", fieldValue.Elem()))
return nil
})
if Error(err) {
return
}
case reflect.Array:
for i := 0; i < val.Len(); i++ {
st.AddCols(strconv.Itoa(i), val.Index(i))
}
case reflect.Slice:
for i := 0; i < val.Len(); i++ {
st.AddCols(strconv.Itoa(i), val.Slice(i, i+1))
}
default:
Error(TraceError(fmt.Errorf("unsupported type")))
}
Debug(st.String())
}
func NewScriptEngine(src string, modulesPath string) (*ScriptEngine, error) {
vm := goja.New()
err := registerConsole(vm)
if Error(err) {
return nil, err
}
err = registerHttp(vm)
if Error(err) {
return nil, err
}
err = registerEtree(vm)
if Error(err) {
return nil, err
}
options := []require.Option{}
if modulesPath != "" {
options = append(options, require.WithGlobalFolders(modulesPath))
}
options = append(options, require.WithLoader(func(path string) ([]byte, error) {
resPath := path
p := strings.Index(resPath, "node_modules")
if p != -1 {
resPath = resPath[p:]
}
resPath = fmt.Sprintf("js/%s", resPath)
ba, _, _ := ReadResource(resPath)
if ba != nil {
Debug("load module as resource : %s", resPath)
return ba, nil
}
return require.DefaultSourceLoader(path)
}),
)
registry := require.NewRegistry(options...)
registry.Enable(vm)
program, err := goja.Compile("", src, false)
if Error(err) {
return nil, err
}
engine := &ScriptEngine{
Registry: registry,
VM: vm,
program: program,
}
return engine, nil
}
func (engine *ScriptEngine) Run(timeout time.Duration, funcName string, args any) (goja.Value, error) {
type result struct {
value goja.Value
err error
}
ch := make(chan result)
go func() {
defer UnregisterGoRoutine(RegisterGoRoutine(1))
var value goja.Value
err := Catch(func() error {
var err error
engine.VM.ClearInterrupt()
// script must be run once to initialize all functions (also the "main" function)
value, err = engine.VM.RunProgram(engine.program)
if Error(err) {
return err
}
if funcName != "" {
fn, ok := goja.AssertFunction(engine.VM.Get(funcName))
if !ok {
return fmt.Errorf("undefined function %s", funcName)
}
value, err = fn(goja.Undefined(), engine.VM.ToValue(args))
if Error(err) {
return err
}
}
return nil
})
if err != nil {
ch <- result{
value: nil,
err: err,
}
return
}
ch <- result{
value: value,
err: nil,
}
}()
select {
case <-time.After(timeout):
engine.VM.Interrupt(nil)
return nil, &ErrTimeout{
Duration: timeout,
Err: nil,
}
case result := <-ch:
return result.value, result.err
}
}
func FormatJavascriptCode(src string) (string, error) {
beautifyCode, err := embedfs.ReadFile("embed/js/beautify.js")
if WarnError(err) {
return src, nil
}
se, err := NewScriptEngine(string(beautifyCode), "")
if Error(err) {
return "", err
}
v, err := se.Run(time.Second, "js_beautify", src)
if Error(err) {
return "", err
}
code := v.String()
code = strings.Replace(code, "= >", "=>", -1)
code = strings.Replace(code, "\r\n", "\n", -1)
return code, nil
}