293 lines
6.8 KiB
Go
293 lines
6.8 KiB
Go
// Copyright (c) 2013-2014, Jeffrey Wilcke. All rights reserved.
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//
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// This library is free software; you can redistribute it and/or
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// modify it under the terms of the GNU General Public
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// License as published by the Free Software Foundation; either
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// version 2.1 of the License, or (at your option) any later version.
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//
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this library; if not, write to the Free Software
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// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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// MA 02110-1301 USA
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package main
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import (
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"bufio"
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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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"strings"
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"github.com/ethereum/go-ethereum/core/types"
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"github.com/ethereum/go-ethereum/eth"
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"github.com/ethereum/go-ethereum/ethutil"
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"github.com/ethereum/go-ethereum/javascript"
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"github.com/ethereum/go-ethereum/state"
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"github.com/ethereum/go-ethereum/xeth"
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"github.com/obscuren/otto"
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"github.com/peterh/liner"
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)
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type prompter interface {
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AppendHistory(string)
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Prompt(p string) (string, error)
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PasswordPrompt(p string) (string, error)
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}
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type dumbterm struct{ r *bufio.Reader }
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func (r dumbterm) Prompt(p string) (string, error) {
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fmt.Print(p)
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return r.r.ReadString('\n')
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}
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func (r dumbterm) PasswordPrompt(p string) (string, error) {
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fmt.Println("!! Unsupported terminal, password will echo.")
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fmt.Print(p)
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input, err := bufio.NewReader(os.Stdin).ReadString('\n')
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fmt.Println()
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return input, err
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}
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func (r dumbterm) AppendHistory(string) {}
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type jsre struct {
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re *javascript.JSRE
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ethereum *eth.Ethereum
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xeth *xeth.XEth
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ps1 string
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atexit func()
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prompter
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}
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func newJSRE(ethereum *eth.Ethereum) *jsre {
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js := &jsre{ethereum: ethereum, ps1: "> "}
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js.xeth = xeth.New(ethereum, js)
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js.re = javascript.NewJSRE(js.xeth)
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js.initStdFuncs()
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if !liner.TerminalSupported() {
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js.prompter = dumbterm{bufio.NewReader(os.Stdin)}
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} else {
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lr := liner.NewLiner()
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js.withHistory(func(hist *os.File) { lr.ReadHistory(hist) })
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lr.SetCtrlCAborts(true)
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js.prompter = lr
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js.atexit = func() {
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js.withHistory(func(hist *os.File) { hist.Truncate(0); lr.WriteHistory(hist) })
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lr.Close()
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}
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}
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return js
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}
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func (self *jsre) ConfirmTransaction(tx *types.Transaction) bool {
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p := fmt.Sprintf("Confirm Transaction %v\n[y/n] ", tx)
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answer, _ := self.Prompt(p)
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return strings.HasPrefix(strings.Trim(answer, " "), "y")
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}
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func (self *jsre) UnlockAccount(addr []byte) bool {
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fmt.Printf("Please unlock account %x.\n", addr)
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pass, err := self.PasswordPrompt("Passphrase: ")
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if err != nil {
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return false
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}
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// TODO: allow retry
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if err := self.ethereum.AccountManager().Unlock(addr, pass); err != nil {
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return false
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} else {
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fmt.Println("Account is now unlocked for this session.")
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return true
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}
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}
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func (self *jsre) exec(filename string) error {
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file, err := os.Open(filename)
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if err != nil {
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return err
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}
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content, err := ioutil.ReadAll(file)
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if err != nil {
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return err
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}
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if _, err := self.re.Run(string(content)); err != nil {
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return fmt.Errorf("Javascript Error: %v", err)
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}
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return nil
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}
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func (self *jsre) interactive() {
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for {
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input, err := self.Prompt(self.ps1)
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if err != nil {
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break
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}
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if input == "" {
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continue
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}
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str += input + "\n"
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self.setIndent()
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if indentCount <= 0 {
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if input == "exit" {
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break
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}
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hist := str[:len(str)-1]
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self.AppendHistory(hist)
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self.parseInput(str)
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str = ""
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}
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}
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if self.atexit != nil {
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self.atexit()
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}
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}
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func (self *jsre) withHistory(op func(*os.File)) {
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hist, err := os.OpenFile(path.Join(self.ethereum.DataDir, "history"), os.O_RDWR|os.O_CREATE, os.ModePerm)
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if err != nil {
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fmt.Printf("unable to open history file: %v\n", err)
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return
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}
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op(hist)
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hist.Close()
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}
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func (self *jsre) parseInput(code string) {
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defer func() {
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if r := recover(); r != nil {
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fmt.Println("[native] error", r)
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}
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}()
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value, err := self.re.Run(code)
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if err != nil {
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fmt.Println(err)
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return
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}
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self.printValue(value)
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}
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var indentCount = 0
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var str = ""
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func (self *jsre) setIndent() {
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open := strings.Count(str, "{")
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open += strings.Count(str, "(")
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closed := strings.Count(str, "}")
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closed += strings.Count(str, ")")
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indentCount = open - closed
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if indentCount <= 0 {
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self.ps1 = "> "
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} else {
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self.ps1 = strings.Join(make([]string, indentCount*2), "..")
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self.ps1 += " "
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}
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}
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func (self *jsre) printValue(v interface{}) {
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method, _ := self.re.Vm.Get("prettyPrint")
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v, err := self.re.Vm.ToValue(v)
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if err == nil {
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val, err := method.Call(method, v)
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if err == nil {
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fmt.Printf("%v", val)
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}
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}
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}
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func (self *jsre) initStdFuncs() {
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t, _ := self.re.Vm.Get("eth")
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eth := t.Object()
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eth.Set("connect", self.connect)
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eth.Set("stopMining", self.stopMining)
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eth.Set("startMining", self.startMining)
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eth.Set("dump", self.dump)
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eth.Set("export", self.export)
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}
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/*
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* The following methods are natively implemented javascript functions.
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*/
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func (self *jsre) dump(call otto.FunctionCall) otto.Value {
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var block *types.Block
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if len(call.ArgumentList) > 0 {
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if call.Argument(0).IsNumber() {
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num, _ := call.Argument(0).ToInteger()
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block = self.ethereum.ChainManager().GetBlockByNumber(uint64(num))
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} else if call.Argument(0).IsString() {
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hash, _ := call.Argument(0).ToString()
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block = self.ethereum.ChainManager().GetBlock(ethutil.Hex2Bytes(hash))
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} else {
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fmt.Println("invalid argument for dump. Either hex string or number")
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}
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if block == nil {
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fmt.Println("block not found")
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return otto.UndefinedValue()
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}
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} else {
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block = self.ethereum.ChainManager().CurrentBlock()
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}
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statedb := state.New(block.Root(), self.ethereum.StateDb())
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v, _ := self.re.Vm.ToValue(statedb.RawDump())
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return v
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}
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func (self *jsre) stopMining(call otto.FunctionCall) otto.Value {
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self.xeth.Miner().Stop()
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return otto.TrueValue()
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}
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func (self *jsre) startMining(call otto.FunctionCall) otto.Value {
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self.xeth.Miner().Start()
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return otto.TrueValue()
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}
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func (self *jsre) connect(call otto.FunctionCall) otto.Value {
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nodeURL, err := call.Argument(0).ToString()
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if err != nil {
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return otto.FalseValue()
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}
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if err := self.ethereum.SuggestPeer(nodeURL); err != nil {
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return otto.FalseValue()
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}
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return otto.TrueValue()
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}
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func (self *jsre) export(call otto.FunctionCall) otto.Value {
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if len(call.ArgumentList) == 0 {
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fmt.Println("err: require file name")
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return otto.FalseValue()
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}
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fn, err := call.Argument(0).ToString()
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if err != nil {
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fmt.Println(err)
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return otto.FalseValue()
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}
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data := self.ethereum.ChainManager().Export()
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if err := ethutil.WriteFile(fn, data); err != nil {
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fmt.Println(err)
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return otto.FalseValue()
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}
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return otto.TrueValue()
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}
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