forked from mirror/go-ethereum
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103 lines
1.9 KiB
103 lines
1.9 KiB
package javascript
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import (
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"fmt"
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"io/ioutil"
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"os"
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"path"
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"path/filepath"
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"github.com/ethereum/go-ethereum/logger"
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"github.com/ethereum/go-ethereum/xeth"
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"github.com/obscuren/otto"
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)
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var jsrelogger = logger.NewLogger("JSRE")
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type JSRE struct {
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Vm *otto.Otto
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xeth *xeth.XEth
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objectCb map[string][]otto.Value
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}
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func (jsre *JSRE) LoadExtFile(path string) {
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result, err := ioutil.ReadFile(path)
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if err == nil {
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jsre.Vm.Run(result)
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} else {
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jsrelogger.Infoln("Could not load file:", path)
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}
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}
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func (jsre *JSRE) LoadIntFile(file string) {
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assetPath := path.Join(os.Getenv("GOPATH"), "src", "github.com", "ethereum", "go-ethereum", "cmd", "mist", "assets", "ext")
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jsre.LoadExtFile(path.Join(assetPath, file))
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}
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func NewJSRE(xeth *xeth.XEth) *JSRE {
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re := &JSRE{
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otto.New(),
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xeth,
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make(map[string][]otto.Value),
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}
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// Init the JS lib
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re.Vm.Run(jsLib)
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// Load extra javascript files
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re.LoadIntFile("bignumber.min.js")
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re.Bind("eth", &JSEthereum{re.xeth, re.Vm})
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re.initStdFuncs()
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jsrelogger.Infoln("started")
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return re
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}
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func (self *JSRE) Bind(name string, v interface{}) {
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self.Vm.Set(name, v)
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}
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func (self *JSRE) Run(code string) (otto.Value, error) {
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return self.Vm.Run(code)
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}
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func (self *JSRE) initStdFuncs() {
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t, _ := self.Vm.Get("eth")
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eth := t.Object()
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eth.Set("require", self.require)
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}
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func (self *JSRE) Require(file string) error {
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if len(filepath.Ext(file)) == 0 {
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file += ".js"
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}
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fh, err := os.Open(file)
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if err != nil {
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return err
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}
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content, _ := ioutil.ReadAll(fh)
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self.Run("exports = {};(function() {" + string(content) + "})();")
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return nil
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}
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func (self *JSRE) require(call otto.FunctionCall) otto.Value {
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file, err := call.Argument(0).ToString()
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if err != nil {
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return otto.UndefinedValue()
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}
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if err := self.Require(file); err != nil {
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fmt.Println("err:", err)
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return otto.UndefinedValue()
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}
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t, _ := self.Vm.Get("exports")
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return t
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}
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