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path: root/cmd/ethereum/js.go
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// 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"
    "os"
    "path"
    "strings"

    "github.com/ethereum/go-ethereum/cmd/utils"
    "github.com/ethereum/go-ethereum/core/types"
    "github.com/ethereum/go-ethereum/eth"
    re "github.com/ethereum/go-ethereum/jsre"
    "github.com/ethereum/go-ethereum/rpc"
    "github.com/ethereum/go-ethereum/xeth"
    "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       *re.JSRE
    ethereum *eth.Ethereum
    xeth     *xeth.XEth
    ps1      string
    atexit   func()

    prompter
}

func newJSRE(ethereum *eth.Ethereum, libPath string) *jsre {
    js := &jsre{ethereum: ethereum, ps1: "> "}
    js.xeth = xeth.New(ethereum, js)
    js.re = re.New(libPath)
    js.apiBindings()
    js.adminBindings()

    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 (js *jsre) apiBindings() {

    ethApi := rpc.NewEthereumApi(js.xeth, js.ethereum.DataDir)
    js.re.Bind("jeth", rpc.NewJeth(ethApi, js.re.ToVal))

    _, err := js.re.Eval(re.BigNumber_JS)

    if err != nil {
        utils.Fatalf("Error loading bignumber.js: %v", err)
    }

    // we need to declare a dummy setTimeout. Otto does not support it
    _, err = js.re.Eval("setTimeout = function(cb, delay) {};")
    if err != nil {
        utils.Fatalf("Error defining setTimeout: %v", err)
    }

    _, err = js.re.Eval(re.Ethereum_JS)
    if err != nil {
        utils.Fatalf("Error loading ethereum.js: %v", err)
    }

    _, err = js.re.Eval("var web3 = require('web3');")
    if err != nil {
        utils.Fatalf("Error requiring web3: %v", err)
    }

    _, err = js.re.Eval("web3.setProvider(jeth)")
    if err != nil {
        utils.Fatalf("Error setting web3 provider: %v", err)
    }
    _, err = js.re.Eval(`
    var eth = web3.eth;
  var shh = web3.shh;
  var db  = web3.db;
  var net = web3.net;
  `)
    if err != nil {
        utils.Fatalf("Error setting namespaces: %v", err)
    }

}

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 {
    if err := self.re.Exec(filename); 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{}) {
    val, err := self.re.PrettyPrint(v)
    if err == nil {
        fmt.Printf("%v", val)
    }
}