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vm.go
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vm.go
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package gojs
import (
"crypto/md5"
"fmt"
"github.com/air-iot/errors"
"github.com/air-iot/gojs/api"
log2 "github.com/air-iot/gojs/log"
"sync"
"time"
"github.com/dop251/goja"
"github.com/dop251/goja_nodejs/console"
"github.com/dop251/goja_nodejs/require"
"github.com/patrickmn/go-cache"
)
var localCache = cache.New(5*time.Minute, 10*time.Minute)
var registry *require.Registry
var programs []*goja.Program
var apilib *api.Lib
var logLib *log2.Log
type Callback func(vm *goja.Runtime) error
func init() {
registry = require.NewRegistry()
programs = make([]*goja.Program, 0)
initPackages("packages/bcd.js")
initPackages("packages/buffer.js")
initPackages("packages/lodash.js")
initPackages("packages/crypto-js.js")
initPackages("packages/moment.js")
initPackages("packages/xml-js.js")
initPackages("packages/formulajs.js")
initPackages("packages/iconv-lite.js")
//initPackages("packages/uuid.js")
apilib = api.NewLib()
logLib = log2.NewLogger()
}
func initPackages(packagePath string) {
lodashBytes, err := F.ReadFile(packagePath)
if err != nil {
panic(fmt.Errorf("read %s err,%s", packagePath, err))
}
p, err := goja.Compile(packagePath, string(lodashBytes), false)
if err != nil {
panic(fmt.Errorf("compile %s err,%s", packagePath, err))
}
programs = append(programs, p)
}
var HandlerError = errors.New400Response(100040004, "脚本函数handler未找到")
type JSvm struct {
lock sync.Mutex
VM *goja.Runtime
Handler goja.Callable
Script string
}
func NewJsVm(id, script string) (*JSvm, error) {
jsVM, err := GetJsVm(id, script)
if err != nil {
return nil, err
}
return jsVM, nil
}
func (j *JSvm) SetObj(key string, obj interface{}) error {
if err := j.VM.Set(key, obj); err != nil {
return errors.Wrap400Err(err, 100040001)
}
return nil
}
func GetVm() (*goja.Runtime, error) {
vm := goja.New()
//registry := new(require.Registry) // this can be shared by multiple runtimes
registry.Enable(vm)
console.Enable(vm)
obj := vm.GlobalObject()
state := map[string]interface{}{}
if err := obj.Set("_state", state); err != nil {
return nil, errors.Wrap400Err(err, 100040001)
}
for _, program := range programs {
_, err := vm.RunProgram(program)
if err != nil {
return nil, errors.Wrap400Err(err, 100040002)
}
}
bufferObj := vm.Get("Buffer").(*goja.Object).Get("Buffer").(*goja.Object)
bufferPrototype := bufferObj.Get("prototype").(*goja.Object)
_ = bufferPrototype.Set("readBigInt64LE", readBigInt64LE(vm))
_ = bufferPrototype.Set("readBigInt64BE", readBigInt64BE(vm))
_ = bufferPrototype.Set("writeBigInt64LE", writeBigInt64LE(vm))
_ = bufferPrototype.Set("writeBigInt64BE", writeBigInt64BE(vm))
_ = bufferPrototype.Set("readBigUInt64LE", readBigUInt64LE(vm))
_ = bufferPrototype.Set("readBigUInt64BE", readBigUInt64BE(vm))
_ = bufferPrototype.Set("writeBigUInt64LE", writeBigUInt64LE(vm))
_ = bufferPrototype.Set("writeBigUInt64BE", writeBigUInt64BE(vm))
_ = vm.Set("_", vm.Get("lodash"))
_ = vm.Set("CryptoJS", vm.Get("cryptoJs"))
_ = vm.Set("Buffer", bufferObj)
_ = vm.Set("formulajs", vm.Get("formulajsformulajs"))
_ = vm.Set("iconv", vm.Get("iconvLite"))
_ = vm.Set("apilib", apilib)
_ = vm.Set(log2.Key, logLib)
_ = AttachCrc(vm)
return vm, nil
}
func GetVmCallback(cb Callback) (*goja.Runtime, error) {
vm, err := GetVm()
if err != nil {
return nil, err
}
_ = AttachCrc(vm)
if cb != nil {
if err := cb(vm); err != nil {
return nil, err
}
}
return vm, nil
}
func GetJsVm(id, script string) (*JSvm, error) {
jsVMI, ok := localCache.Get(id)
var jsVM *JSvm
if !ok {
vm, err := GetVm()
if err != nil {
return nil, err
}
if _, err := vm.RunString(script); err != nil {
return nil, errors.Wrap400Err(err, 100040003)
}
handler, ok := goja.AssertFunction(vm.Get("handler"))
if !ok {
return nil, HandlerError
}
jsVM = &JSvm{
VM: vm,
Handler: handler,
Script: script,
}
} else {
jsVM, _ = jsVMI.(*JSvm)
if fmt.Sprintf("%x", md5.Sum([]byte(script))) != fmt.Sprintf("%x", md5.Sum([]byte(jsVM.Script))) {
if _, err := jsVM.VM.RunString(script); err != nil {
return nil, errors.Wrap400Err(err, 100040003)
}
handler, ok := goja.AssertFunction(jsVM.VM.Get("handler"))
if !ok {
return nil, HandlerError
}
jsVM.Script = script
jsVM.Handler = handler
}
}
localCache.Set(id, jsVM, cache.DefaultExpiration)
return jsVM, nil
}
func Run(script string, values ...interface{}) (goja.Value, error) {
id := fmt.Sprintf("%x", md5.Sum([]byte(script)))
return RunByIdAndScript(id, script, values...)
}
func RunByIdAndScript(id, script string, values ...interface{}) (goja.Value, error) {
jsVM, err := GetJsVm(id, script)
if err != nil {
return nil, err
}
vals := make([]goja.Value, len(values))
if values != nil {
for i, v := range values {
gojaVal, ok := v.(goja.Value)
if ok {
vals[i] = gojaVal
} else {
vals[i] = jsVM.VM.ToValue(v)
}
}
}
jsVM.lock.Lock()
defer jsVM.lock.Unlock()
output, err := jsVM.Handler(goja.Undefined(), vals...)
if err != nil {
return nil, errors.Wrap400Err(err, 100040005)
}
return output, nil
}
func RunById(id string, values ...interface{}) (goja.Value, error) {
jsVMI, ok := localCache.Get(id)
if !ok {
return nil, errors.New400Response(100040006, "未找到vm")
}
jsVM, _ := jsVMI.(*JSvm)
localCache.Set(id, jsVM, cache.DefaultExpiration)
vals := make([]goja.Value, len(values))
if values != nil {
for i, v := range values {
gojaVal, ok := v.(goja.Value)
if ok {
vals[i] = gojaVal
} else {
vals[i] = jsVM.VM.ToValue(v)
}
}
}
jsVM.lock.Lock()
defer jsVM.lock.Unlock()
output, err := jsVM.Handler(goja.Undefined(), vals...)
if err != nil {
return nil, errors.Wrap400Err(err, 100040005)
}
return output, nil
}
func BufferToBytes(bufferVal goja.Value) ([]byte, error) {
obj, ok := bufferVal.(*goja.Object)
if !ok {
return nil, errors.New400Response(100040007, "参数格式非Object")
}
buffer := obj.Get("buffer")
if buffer == nil {
return nil, errors.New400Response(100040008, "未找到buffer")
}
arrayBuffer, ok := buffer.Export().(goja.ArrayBuffer)
if !ok {
return nil, errors.New400Response(100040009, "参数格式非arrayBuffer")
}
dataBytes := arrayBuffer.Bytes()
dataLength := int64(len(dataBytes))
var offset, length int64 = -1, -1
if v := obj.Get("offset"); v != nil {
offset = v.ToInteger()
}
if v := obj.Get("length"); v != nil {
length = v.ToInteger()
}
if offset < 0 || length < 0 || offset >= dataLength || offset+length > dataLength {
return nil, errors.New400ErrResponse(100040010, map[string]interface{}{"offset": offset, "length": length}, "offset %d 或 length %d 超出 buffer 大小", offset, length)
}
return dataBytes[offset : offset+length], nil
}
func BytesToBuffer(vm *goja.Runtime, bs []byte) (goja.Value, error) {
buffer := vm.Get("Buffer")
if buffer == nil {
return nil, errors.New400Response(100040011, "未加载Buffer")
}
bufferObj := buffer.ToObject(vm)
from := bufferObj.Get("from")
if from == nil {
return nil, errors.New400Response(100040012, "未加载Buffer from方法")
}
fromFn, ok := from.Export().(func(goja.FunctionCall) goja.Value)
if !ok {
return nil, errors.New400Response(100040013, "Buffer from方法类型非FunctionCall")
}
buf := fromFn(goja.FunctionCall{
This: bufferObj,
Arguments: []goja.Value{vm.ToValue(bs)},
})
return buf, nil
}