go-ethereum/ethereum/javascript_console.go

package main

import (
	"fmt"
	"github.com/ethereum/eth-go"
	"github.com/ethereum/eth-go/ethpub"
	"github.com/robertkrimen/otto"
)

type Repl interface {
	Start()
}

type JSRE struct {
	vm  *otto.Otto
	lib *ethpub.PEthereum
}

func NewJSRE(ethereum *eth.Ethereum) *JSRE {
	re := &JSRE{vm: otto.New(), lib: ethpub.NewPEthereum(ethereum)}

	re.Bind("eth", &JSEthereum{re.lib, re.vm})

	return re
}

func (self *JSRE) Bind(name string, v interface{}) {
	self.vm.Set(name, v)
}

func (self *JSRE) Run(code string) (otto.Value, error) {
	return self.vm.Run(code)
}

type JSRepl struct {
	re *JSRE
}

func NewJSRepl(ethereum *eth.Ethereum) *JSRepl {
	return &JSRepl{re: NewJSRE(ethereum)}
}

func (self *JSRepl) Start() {
	fmt.Println("Eth JavaScript console")
	self.read()
}

func (self *JSRepl) parseInput(code string) {
	defer func() {
		if r := recover(); r != nil {
			fmt.Println("[native] error", r)
		}
	}()

	value, err := self.re.Run(code)
	if err != nil {
		fmt.Println(err)
		return
	}

	fmt.Println(value)
}

// The JSEthereum object attempts to wrap the PEthereum object and returns
// meaningful javascript objects
type JSEthereum struct {
	*ethpub.PEthereum
	vm *otto.Otto
}

func (self *JSEthereum) GetKey() otto.Value {
	return self.toVal(self.PEthereum.GetKey())
}

func (self *JSEthereum) GetStateObject(addr string) otto.Value {
	return self.toVal(self.PEthereum.GetStateObject(addr))
}

func (self *JSEthereum) Transact(key, recipient, valueStr, gasStr, gasPriceStr, dataStr string) otto.Value {
	r, err := self.PEthereum.Transact(key, recipient, valueStr, gasStr, gasPriceStr, dataStr)
	if err != nil {
		fmt.Println(err)

		return otto.UndefinedValue()
	}

	return self.toVal(r)
}

func (self *JSEthereum) Create(key, valueStr, gasStr, gasPriceStr, initStr, bodyStr string) otto.Value {
	r, err := self.PEthereum.Create(key, valueStr, gasStr, gasPriceStr, initStr, bodyStr)

	if err != nil {
		fmt.Println(err)

		return otto.UndefinedValue()
	}

	return self.toVal(r)
}

// Wrapper function
func (self *JSEthereum) toVal(v interface{}) otto.Value {
	result, err := self.vm.ToValue(v)

	if err != nil {
		fmt.Println(err)

		return otto.UndefinedValue()
	}

	return result
}