我正在尝试向 Otto JavaSCript 运行时公开现有的 Go 对象。该对象已公开,我可以看到它,但是当我调用影响公开对象状态的方法时,我会遇到 panic 和错误,甚至只是被 Otto 默默忽略!
Golang代码:
package main
import (
"bytes"
"fmt"
"log"
"os"
"github.com/robertkrimen/otto"
)
type BensObject struct {
name string
}
func (b BensObject) SetName(name string) {
fmt.Println("INT: ", name)
b.name = name
fmt.Println("INT: ", b.name)
}
func (b BensObject) GetName() string {
fmt.Println("INT: ", b.name)
return b.name
}
func (b BensObject) Age() int {
return 36
}
func (b BensObject) AddToAge(n int) int {
return 36 + n
}
func main() {
runtime := loadPluginRuntime("plugins.js")
// If we don't have a runtime all requests are accepted
if runtime == nil {
os.Exit(-1)
}
r := new(BensObject)
v, err := runtime.ToValue(*r)
if err != nil {
log.Fatal(err)
}
// By convention we will require plugins have a set name
result, err := runtime.Call("checkRequest", nil, v)
if err != nil {
log.Fatal(err)
}
// If the js function did not return a bool error out
// because the plugin is invalid
out, err := result.ToBoolean()
if err != nil {
log.Fatalf("\"checkRequest\" must return a boolean. Got %s", err)
}
fmt.Println(out)
}
func loadPluginRuntime(name string) *otto.Otto {
f, err := os.Open(name)
if err != nil {
if os.IsNotExist(err) {
return nil
}
log.Fatal(err)
}
defer f.Close()
buff := bytes.NewBuffer(nil)
if _, err := buff.ReadFrom(f); err != nil {
log.Fatal(err)
}
runtime := otto.New()
// Load the plugin file into the runtime before we
// return it for use
if _, err := runtime.Run(buff.String()); err != nil {
log.Fatal(err)
}
return runtime
}
JavaScript 代码:
var getKeys = function(obj){
var keys = [];
for(var key in obj){
keys.push(key);
}
return keys;
}
function checkRequest(r) {
console.log(r);
r.SetName("Ben");
console.log(r.GetName());
console.log(getKeys(r));
console.log(r.Name);
console.log(r.Age());
console.log(r.AddToAge(10));
return true
}
有人有见解吗?有没有人能够通过 Ottos 运行时的方法公开现有的大型对象结构?我有一个非常大的 Go 包,我想直接暴露给 Otto 运行时,而不必对 JS 进行太多繁琐且脆弱的“映射”。
最佳答案
Go-nuts 邮件列表上的 Greg Rosebury 为我回答了这个问题。我在这里逐字复制了他的回答:
Hello, try putting a pointer to your object into the runtime. Use *BensObject and change your methods to take pointer receivers: func (b *BensObject) SetName(name string) { ... } Change runtime.ToValue(*r) to runtime.ToValue(r).
Basically BensObject is getting copied every time you call a method on it, so changes aren't being reflected.
这解决了问题,并且对象正确共享到 Otto 运行时,并且通过方法进行的更改得到正确反射(reflect)。
关于javascript - Golang Otto JS - 将主机对象公开给 JavaScript,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/31075670/