1 files changed, 280 insertions, 0 deletions
diff --git a/cmd/ethereum/js.go b/cmd/ethereum/js.go
new file mode 100644
index 000000000..9125ccbba
--- /dev/null
+++ b/cmd/ethereum/js.go
@@ -0,0 +1,280 @@
+// 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"
+	"os/signal"
+	"path"
+	"strings"
+
+	"github.com/ethereum/go-ethereum/cmd/utils"
+	"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"
+)
+
+func execJsFile(ethereum *eth.Ethereum, filename string) {
+	file, err := os.Open(filename)
+	if err != nil {
+		utils.Fatalf("%v", err)
+	}
+	content, err := ioutil.ReadAll(file)
+	if err != nil {
+		utils.Fatalf("%v", err)
+	}
+	re := javascript.NewJSRE(xeth.New(ethereum))
+	if _, err := re.Run(string(content)); err != nil {
+		utils.Fatalf("Javascript Error: %v", err)
+	}
+}
+
+type repl struct {
+	re       *javascript.JSRE
+	ethereum *eth.Ethereum
+	xeth     *xeth.XEth
+	prompt   string
+	lr       *liner.State
+}
+
+func runREPL(ethereum *eth.Ethereum) {
+	xeth := xeth.New(ethereum)
+	repl := &repl{
+		re:       javascript.NewJSRE(xeth),
+		xeth:     xeth,
+		ethereum: ethereum,
+		prompt:   "> ",
+	}
+	repl.initStdFuncs()
+	if !liner.TerminalSupported() {
+		repl.dumbRead()
+	} else {
+		lr := liner.NewLiner()
+		defer lr.Close()
+		lr.SetCtrlCAborts(true)
+		repl.withHistory(func(hist *os.File) { lr.ReadHistory(hist) })
+		repl.read(lr)
+		repl.withHistory(func(hist *os.File) { hist.Truncate(0); lr.WriteHistory(hist) })
+	}
+}
+
+func (self *repl) 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 *repl) 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 *repl) setIndent() {
+	open := strings.Count(str, "{")
+	open += strings.Count(str, "(")
+	closed := strings.Count(str, "}")
+	closed += strings.Count(str, ")")
+	indentCount = open - closed
+	if indentCount <= 0 {
+		self.prompt = "> "
+	} else {
+		self.prompt = strings.Join(make([]string, indentCount*2), "..")
+		self.prompt += " "
+	}
+}
+
+func (self *repl) read(lr *liner.State) {
+	for {
+		input, err := lr.Prompt(self.prompt)
+		if err != nil {
+			return
+		}
+		if input == "" {
+			continue
+		}
+		str += input + "\n"
+		self.setIndent()
+		if indentCount <= 0 {
+			if input == "exit" {
+				return
+			}
+			hist := str[:len(str)-1]
+			lr.AppendHistory(hist)
+			self.parseInput(str)
+			str = ""
+		}
+	}
+}
+
+func (self *repl) dumbRead() {
+	fmt.Println("Unsupported terminal, line editing will not work.")
+
+	// process lines
+	readDone := make(chan struct{})
+	go func() {
+		r := bufio.NewReader(os.Stdin)
+	loop:
+		for {
+			fmt.Print(self.prompt)
+			line, err := r.ReadString('\n')
+			switch {
+			case err != nil || line == "exit":
+				break loop
+			case line == "":
+				continue
+			default:
+				self.parseInput(line + "\n")
+			}
+		}
+		close(readDone)
+	}()
+
+	// wait for Ctrl-C
+	sigc := make(chan os.Signal, 1)
+	signal.Notify(sigc, os.Interrupt, os.Kill)
+	defer signal.Stop(sigc)
+
+	select {
+	case <-readDone:
+	case <-sigc:
+		os.Stdin.Close() // terminate read
+	}
+}
+
+func (self *repl) 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 *repl) 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 *repl) 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.Db())
+
+	v, _ := self.re.Vm.ToValue(statedb.RawDump())
+
+	return v
+}
+
+func (self *repl) stopMining(call otto.FunctionCall) otto.Value {
+	self.xeth.Miner().Stop()
+	return otto.TrueValue()
+}
+
+func (self *repl) startMining(call otto.FunctionCall) otto.Value {
+	self.xeth.Miner().Start()
+	return otto.TrueValue()
+}
+
+func (self *repl) 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 *repl) 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()
+}