/
script.go
183 lines (148 loc) · 3.36 KB
/
script.go
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package common
import (
"fmt"
"github.com/dop251/goja"
"github.com/dop251/goja_nodejs/require"
"os"
"path/filepath"
"reflect"
"strconv"
"time"
)
type ScriptEngine struct {
Registry *require.Registry
VM *goja.Runtime
program *goja.Program
}
func (c *console) 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
}
modulesPath = CleanPath(modulesPath)
registry := require.NewRegistry(
require.WithGlobalFolders(modulesPath),
require.WithLoader(func(path string) ([]byte, error) {
path = CleanPath(path)
Debug("load module: %s", path)
ba, _, err := ReadResource(filepath.Base(path))
if ba == nil && modulesPath != "" {
if filepath.Dir(path) == modulesPath {
ba, err = os.ReadFile(path)
if Error(err) {
return nil, err
}
} else {
return nil, TraceError(require.IllegalModuleNameError)
}
}
if ba == nil {
return nil, TraceError(require.ModuleFileDoesNotExistError)
}
str := fmt.Sprintf(`(function(__filename,__dirname){%s})(%q,%q)`,
ba,
path,
filepath.Dir(path),
)
return []byte(str), nil
}),
)
registry.Enable(vm)
program, err := goja.Compile("", src, true)
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, input string) (string, error) {
type result struct {
value string
err error
}
ch := make(chan result)
go func() {
var value goja.Value
var err error
value, err = engine.VM.RunProgram(engine.program)
if funcName != "" {
fn := func() (goja.Value, error) {
var jsFunc func(goja.Value) goja.Value
err := engine.VM.ExportTo(engine.VM.GlobalObject().Get(funcName), &jsFunc)
if Error(err) {
return goja.Undefined(), err
}
err = Catch(func() {
value = jsFunc(engine.VM.ToValue(input))
})
if Error(err) {
return goja.Undefined(), err
}
return value, nil
}
value, err = fn()
}
if err != nil {
ch <- result{
value: "",
err: err,
}
return
}
ch <- result{
value: value.String(),
err: nil,
}
}()
select {
case <-time.After(timeout):
engine.VM.Interrupt(nil)
return "", &ErrTimeout{
Duration: timeout,
Err: nil,
}
case result := <-ch:
return result.value, result.err
}
}