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