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package main
import (
"bufio"
"fmt"
"github.com/ethereum/eth-go"
"github.com/ethereum/eth-go/ethpub"
"github.com/robertkrimen/otto"
"os"
)
type JSConsole struct {
vm *otto.Otto
lib *ethpub.PEthereum
}
func NewJSConsole(ethereum *eth.Ethereum) *JSConsole {
return &JSConsole{vm: otto.New(), lib: ethpub.NewPEthereum(ethereum)}
}
func (self *JSConsole) Start() {
self.initBindings()
fmt.Println("Eth JavaScript console")
reader := bufio.NewReader(os.Stdin)
for {
fmt.Printf("eth >>> ")
str, _, err := reader.ReadLine()
if err != nil {
fmt.Println("Error reading input", err)
} else {
self.ParseInput(string(str))
}
}
}
func (self *JSConsole) ParseInput(code string) {
defer func() {
if r := recover(); r != nil {
fmt.Println("[native] error", r)
}
}()
value, err := self.vm.Run(code)
if err != nil {
fmt.Println(err)
return
}
fmt.Println(value)
}
func (self *JSConsole) initBindings() {
t := &JSWrapper{self.lib, self.vm}
self.vm.Set("eth", t)
}
// The JS wrapper attempts to wrap the PEthereum object and returns
// proper javascript objects
type JSWrapper struct {
*ethpub.PEthereum
vm *otto.Otto
}
func (self *JSWrapper) GetKey() otto.Value {
return self.toVal(self.PEthereum.GetKey())
}
func (self *JSWrapper) GetStateObject(addr string) otto.Value {
return self.toVal(self.PEthereum.GetStateObject(addr))
}
func (self *JSWrapper) 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 *JSWrapper) 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 *JSWrapper) toVal(v interface{}) otto.Value {
result, err := self.vm.ToValue(v)
if err != nil {
fmt.Println(err)
return otto.UndefinedValue()
}
return result
}
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