1 files changed, 294 insertions, 0 deletions
diff --git a/cmd/ethereum/js.go b/cmd/ethereum/js.go
new file mode 100644
index 000000000..a3c5f5d2d
--- /dev/null
+++ b/cmd/ethereum/js.go
@@ -0,0 +1,294 @@
+// 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/common"
+	"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(common.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.ethereum.StopMining()
+	return otto.TrueValue()
+}
+
+func (self *jsre) startMining(call otto.FunctionCall) otto.Value {
+	if err := self.ethereum.StartMining(); err != nil {
+		return otto.FalseValue()
+	}
+	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 := common.WriteFile(fn, data); err != nil {
+		fmt.Println(err)
+		return otto.FalseValue()
+	}
+
+	return otto.TrueValue()
+}