Merge pull request #2535 from karalabe/modularize-console

cmd, console: split off the console into a reusable package

26 files changed, 1592 insertions, 1519 deletions

diff --git a/cmd/geth/accountcmd.go b/cmd/geth/accountcmd.go
index bf754c72f..0f9d95c2c 100644
--- a/cmd/geth/accountcmd.go
+++ b/cmd/geth/accountcmd.go
@@ -23,6 +23,7 @@ import (
 	"github.com/codegangsta/cli"
 	"github.com/ethereum/go-ethereum/accounts"
 	"github.com/ethereum/go-ethereum/cmd/utils"
+	"github.com/ethereum/go-ethereum/console"
 	"github.com/ethereum/go-ethereum/crypto"
 	"github.com/ethereum/go-ethereum/logger"
 	"github.com/ethereum/go-ethereum/logger/glog"
@@ -215,12 +216,12 @@ func getPassPhrase(prompt string, confirmation bool, i int, passwords []string)
 	if prompt != "" {
 		fmt.Println(prompt)
 	}
-	password, err := utils.Stdin.PasswordPrompt("Passphrase: ")
+	password, err := console.Stdin.PromptPassword("Passphrase: ")
 	if err != nil {
 		utils.Fatalf("Failed to read passphrase: %v", err)
 	}
 	if confirmation {
-		confirm, err := utils.Stdin.PasswordPrompt("Repeat passphrase: ")
+		confirm, err := console.Stdin.PromptPassword("Repeat passphrase: ")
 		if err != nil {
 			utils.Fatalf("Failed to read passphrase confirmation: %v", err)
 		}
diff --git a/cmd/geth/chaincmd.go b/cmd/geth/chaincmd.go
index 32eacc99e..4f47de5d7 100644
--- a/cmd/geth/chaincmd.go
+++ b/cmd/geth/chaincmd.go
@@ -26,6 +26,7 @@ import (
 	"github.com/codegangsta/cli"
 	"github.com/ethereum/go-ethereum/cmd/utils"
 	"github.com/ethereum/go-ethereum/common"
+	"github.com/ethereum/go-ethereum/console"
 	"github.com/ethereum/go-ethereum/core"
 	"github.com/ethereum/go-ethereum/core/state"
 	"github.com/ethereum/go-ethereum/core/types"
@@ -116,7 +117,7 @@ func exportChain(ctx *cli.Context) {
 }
 
 func removeDB(ctx *cli.Context) {
-	confirm, err := utils.Stdin.ConfirmPrompt("Remove local database?")
+	confirm, err := console.Stdin.PromptConfirm("Remove local database?")
 	if err != nil {
 		utils.Fatalf("%v", err)
 	}
diff --git a/cmd/geth/consolecmd.go b/cmd/geth/consolecmd.go
new file mode 100644
index 000000000..8bfe27fef
--- /dev/null
+++ b/cmd/geth/consolecmd.go
@@ -0,0 +1,167 @@
+// Copyright 2016 The go-ethereum Authors
+// This file is part of go-ethereum.
+//
+// go-ethereum 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 3 of the License, or
+// (at your option) any later version.
+//
+// go-ethereum 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 go-ethereum. If not, see <http://www.gnu.org/licenses/>.
+
+package main
+
+import (
+	"os"
+	"os/signal"
+
+	"github.com/codegangsta/cli"
+	"github.com/ethereum/go-ethereum/cmd/utils"
+	"github.com/ethereum/go-ethereum/console"
+)
+
+var (
+	consoleCommand = cli.Command{
+		Action: localConsole,
+		Name:   "console",
+		Usage:  `Geth Console: interactive JavaScript environment`,
+		Description: `
+The Geth console is an interactive shell for the JavaScript runtime environment
+which exposes a node admin interface as well as the Ðapp JavaScript API.
+See https://github.com/ethereum/go-ethereum/wiki/Javascipt-Console
+`,
+	}
+	attachCommand = cli.Command{
+		Action: remoteConsole,
+		Name:   "attach",
+		Usage:  `Geth Console: interactive JavaScript environment (connect to node)`,
+		Description: `
+The Geth console is an interactive shell for the JavaScript runtime environment
+which exposes a node admin interface as well as the Ðapp JavaScript API.
+See https://github.com/ethereum/go-ethereum/wiki/Javascipt-Console.
+This command allows to open a console on a running geth node.
+	`,
+	}
+	javascriptCommand = cli.Command{
+		Action: ephemeralConsole,
+		Name:   "js",
+		Usage:  `executes the given JavaScript files in the Geth JavaScript VM`,
+		Description: `
+The JavaScript VM exposes a node admin interface as well as the Ðapp
+JavaScript API. See https://github.com/ethereum/go-ethereum/wiki/Javascipt-Console
+`,
+	}
+)
+
+// localConsole starts a new geth node, attaching a JavaScript console to it at the
+// same time.
+func localConsole(ctx *cli.Context) {
+	// Create and start the node based on the CLI flags
+	node := utils.MakeSystemNode(clientIdentifier, verString, relConfig, makeDefaultExtra(), ctx)
+	startNode(ctx, node)
+	defer node.Stop()
+
+	// Attach to the newly started node and start the JavaScript console
+	client, err := node.Attach()
+	if err != nil {
+		utils.Fatalf("Failed to attach to the inproc geth: %v", err)
+	}
+	config := console.Config{
+		DataDir: node.DataDir(),
+		DocRoot: ctx.GlobalString(utils.JSpathFlag.Name),
+		Client:  client,
+		Preload: utils.MakeConsolePreloads(ctx),
+	}
+	console, err := console.New(config)
+	if err != nil {
+		utils.Fatalf("Failed to start the JavaScript console: %v", err)
+	}
+	defer console.Stop(false)
+
+	// If only a short execution was requested, evaluate and return
+	if script := ctx.GlobalString(utils.ExecFlag.Name); script != "" {
+		console.Evaluate(script)
+		return
+	}
+	// Otherwise print the welcome screen and enter interactive mode
+	console.Welcome()
+	console.Interactive()
+}
+
+// remoteConsole will connect to a remote geth instance, attaching a JavaScript
+// console to it.
+func remoteConsole(ctx *cli.Context) {
+	// Attach to a remotely running geth instance and start the JavaScript console
+	client, err := utils.NewRemoteRPCClient(ctx)
+	if err != nil {
+		utils.Fatalf("Unable to attach to remote geth: %v", err)
+	}
+	config := console.Config{
+		DataDir: utils.MustMakeDataDir(ctx),
+		DocRoot: ctx.GlobalString(utils.JSpathFlag.Name),
+		Client:  client,
+		Preload: utils.MakeConsolePreloads(ctx),
+	}
+	console, err := console.New(config)
+	if err != nil {
+		utils.Fatalf("Failed to start the JavaScript console: %v", err)
+	}
+	defer console.Stop(false)
+
+	// If only a short execution was requested, evaluate and return
+	if script := ctx.GlobalString(utils.ExecFlag.Name); script != "" {
+		console.Evaluate(script)
+		return
+	}
+	// Otherwise print the welcome screen and enter interactive mode
+	console.Welcome()
+	console.Interactive()
+}
+
+// ephemeralConsole starts a new geth node, attaches an ephemeral JavaScript
+// console to it, and each of the files specified as arguments and tears the
+// everything down.
+func ephemeralConsole(ctx *cli.Context) {
+	// Create and start the node based on the CLI flags
+	node := utils.MakeSystemNode(clientIdentifier, verString, relConfig, makeDefaultExtra(), ctx)
+	startNode(ctx, node)
+	defer node.Stop()
+
+	// Attach to the newly started node and start the JavaScript console
+	client, err := node.Attach()
+	if err != nil {
+		utils.Fatalf("Failed to attach to the inproc geth: %v", err)
+	}
+	config := console.Config{
+		DataDir: node.DataDir(),
+		DocRoot: ctx.GlobalString(utils.JSpathFlag.Name),
+		Client:  client,
+		Preload: utils.MakeConsolePreloads(ctx),
+	}
+	console, err := console.New(config)
+	if err != nil {
+		utils.Fatalf("Failed to start the JavaScript console: %v", err)
+	}
+	defer console.Stop(false)
+
+	// Evaluate each of the specified JavaScript files
+	for _, file := range ctx.Args() {
+		if err = console.Execute(file); err != nil {
+			utils.Fatalf("Failed to execute %s: %v", file, err)
+		}
+	}
+	// Wait for pending callbacks, but stop for Ctrl-C.
+	abort := make(chan os.Signal, 1)
+	signal.Notify(abort, os.Interrupt)
+
+	go func() {
+		<-abort
+		os.Exit(0)
+	}()
+	console.Stop(true)
+}
diff --git a/cmd/geth/consolecmd_test.go b/cmd/geth/consolecmd_test.go
new file mode 100644
index 000000000..9cfb3e4e3
--- /dev/null
+++ b/cmd/geth/consolecmd_test.go
@@ -0,0 +1,152 @@
+// Copyright 2016 The go-ethereum Authors
+// This file is part of go-ethereum.
+//
+// go-ethereum 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 3 of the License, or
+// (at your option) any later version.
+//
+// go-ethereum 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 go-ethereum. If not, see <http://www.gnu.org/licenses/>.
+
+package main
+
+import (
+	"math/rand"
+	"os"
+	"path/filepath"
+	"runtime"
+	"sort"
+	"strconv"
+	"strings"
+	"testing"
+	"time"
+
+	"github.com/ethereum/go-ethereum/console"
+	"github.com/ethereum/go-ethereum/rpc"
+)
+
+// Tests that a node embedded within a console can be started up properly and
+// then terminated by closing the input stream.
+func TestConsoleWelcome(t *testing.T) {
+	coinbase := "0x8605cdbbdb6d264aa742e77020dcbc58fcdce182"
+
+	// Start a geth console, make sure it's cleaned up and terminate the console
+	geth := runGeth(t, "--nat", "none", "--nodiscover", "--etherbase", coinbase, "-shh", "console")
+	defer geth.expectExit()
+	geth.stdin.Close()
+
+	// Gather all the infos the welcome message needs to contain
+	geth.setTemplateFunc("goos", func() string { return runtime.GOOS })
+	geth.setTemplateFunc("gover", runtime.Version)
+	geth.setTemplateFunc("gethver", func() string { return verString })
+	geth.setTemplateFunc("niltime", func() string { return time.Unix(0, 0).Format(time.RFC1123) })
+	geth.setTemplateFunc("apis", func() []string {
+		apis := append(strings.Split(rpc.DefaultIPCApis, ","), rpc.MetadataApi)
+		sort.Strings(apis)
+		return apis
+	})
+	geth.setTemplateFunc("prompt", func() string { return console.DefaultPrompt })
+
+	// Verify the actual welcome message to the required template
+	geth.expect(`
+Welcome to the Geth JavaScript console!
+
+instance: Geth/v{{gethver}}/{{goos}}/{{gover}}
+coinbase: {{.Etherbase}}
+at block: 0 ({{niltime}})
+ datadir: {{.Datadir}}
+ modules:{{range apis}} {{.}}:1.0{{end}}
+
+{{prompt}}
+`)
+}
+
+// Tests that a console can be attached to a running node via various means.
+func TestIPCAttachWelcome(t *testing.T) {
+	// Configure the instance for IPC attachement
+	coinbase := "0x8605cdbbdb6d264aa742e77020dcbc58fcdce182"
+
+	var ipc string
+	if runtime.GOOS == "windows" {
+		ipc = `\\.\pipe\geth` + strconv.Itoa(rand.Int())
+	} else {
+		ws := tmpdir(t)
+		defer os.RemoveAll(ws)
+
+		ipc = filepath.Join(ws, "geth.ipc")
+	}
+	// Run the parent geth and attach with a child console
+	geth := runGeth(t, "--nat", "none", "--nodiscover", "--etherbase", coinbase, "-shh", "--ipcpath", ipc)
+	defer geth.interrupt()
+
+	time.Sleep(2 * time.Second) // Simple way to wait for the RPC endpoint to open
+	testAttachWelcome(t, geth, "ipc:"+ipc)
+}
+
+func TestHTTPAttachWelcome(t *testing.T) {
+	coinbase := "0x8605cdbbdb6d264aa742e77020dcbc58fcdce182"
+	port := strconv.Itoa(rand.Intn(65535-1024) + 1024) // Yeah, sometimes this will fail, sorry :P
+
+	geth := runGeth(t, "--nat", "none", "--nodiscover", "--etherbase", coinbase, "--rpc", "--rpcport", port)
+	defer geth.interrupt()
+
+	time.Sleep(2 * time.Second) // Simple way to wait for the RPC endpoint to open
+	testAttachWelcome(t, geth, "http://localhost:"+port)
+}
+
+func TestWSAttachWelcome(t *testing.T) {
+	coinbase := "0x8605cdbbdb6d264aa742e77020dcbc58fcdce182"
+	port := strconv.Itoa(rand.Intn(65535-1024) + 1024) // Yeah, sometimes this will fail, sorry :P
+
+	geth := runGeth(t, "--nat", "none", "--nodiscover", "--etherbase", coinbase, "--ws", "--wsport", port)
+	defer geth.interrupt()
+
+	time.Sleep(2 * time.Second) // Simple way to wait for the RPC endpoint to open
+	testAttachWelcome(t, geth, "ws://localhost:"+port)
+}
+
+func testAttachWelcome(t *testing.T, geth *testgeth, endpoint string) {
+	// Attach to a running geth note and terminate immediately
+	attach := runGeth(t, "attach", endpoint)
+	defer attach.expectExit()
+	attach.stdin.Close()
+
+	// Gather all the infos the welcome message needs to contain
+	attach.setTemplateFunc("goos", func() string { return runtime.GOOS })
+	attach.setTemplateFunc("gover", runtime.Version)
+	attach.setTemplateFunc("gethver", func() string { return verString })
+	attach.setTemplateFunc("etherbase", func() string { return geth.Etherbase })
+	attach.setTemplateFunc("niltime", func() string { return time.Unix(0, 0).Format(time.RFC1123) })
+	attach.setTemplateFunc("ipc", func() bool { return strings.HasPrefix(endpoint, "ipc") })
+	attach.setTemplateFunc("datadir", func() string { return geth.Datadir })
+	attach.setTemplateFunc("apis", func() []string {
+		var apis []string
+		if strings.HasPrefix(endpoint, "ipc") {
+			apis = append(strings.Split(rpc.DefaultIPCApis, ","), rpc.MetadataApi)
+		} else {
+			apis = append(strings.Split(rpc.DefaultHTTPApis, ","), rpc.MetadataApi)
+		}
+		sort.Strings(apis)
+		return apis
+	})
+	attach.setTemplateFunc("prompt", func() string { return console.DefaultPrompt })
+
+	// Verify the actual welcome message to the required template
+	attach.expect(`
+Welcome to the Geth JavaScript console!
+
+instance: Geth/v{{gethver}}/{{goos}}/{{gover}}
+coinbase: {{etherbase}}
+at block: 0 ({{niltime}}){{if ipc}}
+ datadir: {{datadir}}{{end}}
+ modules:{{range apis}} {{.}}:1.0{{end}}
+
+{{prompt}}
+`)
+}
diff --git a/cmd/geth/js.go b/cmd/geth/js.go
deleted file mode 100644
index 5f455d7a3..000000000
--- a/cmd/geth/js.go
+++ /dev/null
@@ -1,424 +0,0 @@
-// Copyright 2015 The go-ethereum Authors
-// This file is part of go-ethereum.
-//
-// go-ethereum 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 3 of the License, or
-// (at your option) any later version.
-//
-// go-ethereum 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 go-ethereum. If not, see <http://www.gnu.org/licenses/>.
-
-package main
-
-import (
-	"fmt"
-	"math/big"
-	"os"
-	"os/signal"
-	"path/filepath"
-	"regexp"
-	"sort"
-	"strings"
-
-	"github.com/codegangsta/cli"
-	"github.com/ethereum/go-ethereum/accounts"
-	"github.com/ethereum/go-ethereum/cmd/utils"
-	"github.com/ethereum/go-ethereum/common"
-	"github.com/ethereum/go-ethereum/common/registrar"
-	"github.com/ethereum/go-ethereum/eth"
-	"github.com/ethereum/go-ethereum/internal/web3ext"
-	re "github.com/ethereum/go-ethereum/jsre"
-	"github.com/ethereum/go-ethereum/node"
-	"github.com/ethereum/go-ethereum/rpc"
-	"github.com/peterh/liner"
-	"github.com/robertkrimen/otto"
-)
-
-var (
-	passwordRegexp = regexp.MustCompile("personal.[nus]")
-	onlyws         = regexp.MustCompile("^\\s*$")
-	exit           = regexp.MustCompile("^\\s*exit\\s*;*\\s*$")
-)
-
-type jsre struct {
-	re         *re.JSRE
-	stack      *node.Node
-	wait       chan *big.Int
-	ps1        string
-	atexit     func()
-	corsDomain string
-	client     rpc.Client
-}
-
-func makeCompleter(re *jsre) liner.WordCompleter {
-	return func(line string, pos int) (head string, completions []string, tail string) {
-		if len(line) == 0 || pos == 0 {
-			return "", nil, ""
-		}
-		// chuck data to relevant part for autocompletion, e.g. in case of nested lines eth.getBalance(eth.coinb<tab><tab>
-		i := 0
-		for i = pos - 1; i > 0; i-- {
-			if line[i] == '.' || (line[i] >= 'a' && line[i] <= 'z') || (line[i] >= 'A' && line[i] <= 'Z') {
-				continue
-			}
-			if i >= 3 && line[i] == '3' && line[i-3] == 'w' && line[i-2] == 'e' && line[i-1] == 'b' {
-				continue
-			}
-			i += 1
-			break
-		}
-		return line[:i], re.re.CompleteKeywords(line[i:pos]), line[pos:]
-	}
-}
-
-func newLightweightJSRE(docRoot string, client rpc.Client, datadir string, interactive bool) *jsre {
-	js := &jsre{ps1: "> "}
-	js.wait = make(chan *big.Int)
-	js.client = client
-	js.re = re.New(docRoot)
-	if err := js.apiBindings(); err != nil {
-		utils.Fatalf("Unable to initialize console - %v", err)
-	}
-	js.setupInput(datadir)
-	return js
-}
-
-func newJSRE(stack *node.Node, docRoot, corsDomain string, client rpc.Client, interactive bool) *jsre {
-	js := &jsre{stack: stack, ps1: "> "}
-	// set default cors domain used by startRpc from CLI flag
-	js.corsDomain = corsDomain
-	js.wait = make(chan *big.Int)
-	js.client = client
-	js.re = re.New(docRoot)
-	if err := js.apiBindings(); err != nil {
-		utils.Fatalf("Unable to connect - %v", err)
-	}
-	js.setupInput(stack.DataDir())
-	return js
-}
-
-func (self *jsre) setupInput(datadir string) {
-	self.withHistory(datadir, func(hist *os.File) { utils.Stdin.ReadHistory(hist) })
-	utils.Stdin.SetCtrlCAborts(true)
-	utils.Stdin.SetWordCompleter(makeCompleter(self))
-	utils.Stdin.SetTabCompletionStyle(liner.TabPrints)
-	self.atexit = func() {
-		self.withHistory(datadir, func(hist *os.File) {
-			hist.Truncate(0)
-			utils.Stdin.WriteHistory(hist)
-		})
-		utils.Stdin.Close()
-		close(self.wait)
-	}
-}
-
-func (self *jsre) batch(statement string) {
-	err := self.re.EvalAndPrettyPrint(statement)
-
-	if err != nil {
-		fmt.Printf("%v", jsErrorString(err))
-	}
-
-	if self.atexit != nil {
-		self.atexit()
-	}
-
-	self.re.Stop(false)
-}
-
-// show summary of current geth instance
-func (self *jsre) welcome() {
-	self.re.Run(`
-    (function () {
-      console.log('instance: ' + web3.version.node);
-      console.log("coinbase: " + eth.coinbase);
-      var ts = 1000 * eth.getBlock(eth.blockNumber).timestamp;
-      console.log("at block: " + eth.blockNumber + " (" + new Date(ts) + ")");
-      console.log(' datadir: ' + admin.datadir);
-    })();
-  `)
-	if modules, err := self.supportedApis(); err == nil {
-		loadedModules := make([]string, 0)
-		for api, version := range modules {
-			loadedModules = append(loadedModules, fmt.Sprintf("%s:%s", api, version))
-		}
-		sort.Strings(loadedModules)
-	}
-}
-
-func (self *jsre) supportedApis() (map[string]string, error) {
-	return self.client.SupportedModules()
-}
-
-func (js *jsre) apiBindings() error {
-	apis, err := js.supportedApis()
-	if err != nil {
-		return err
-	}
-
-	apiNames := make([]string, 0, len(apis))
-	for a, _ := range apis {
-		apiNames = append(apiNames, a)
-	}
-
-	jeth := utils.NewJeth(js.re, js.client)
-	js.re.Set("jeth", struct{}{})
-	t, _ := js.re.Get("jeth")
-	jethObj := t.Object()
-
-	jethObj.Set("send", jeth.Send)
-	jethObj.Set("sendAsync", jeth.Send)
-
-	err = js.re.Compile("bignumber.js", re.BigNumber_JS)
-	if err != nil {
-		utils.Fatalf("Error loading bignumber.js: %v", err)
-	}
-
-	err = js.re.Compile("web3.js", re.Web3_JS)
-	if err != nil {
-		utils.Fatalf("Error loading web3.js: %v", err)
-	}
-
-	_, err = js.re.Run("var Web3 = require('web3');")
-	if err != nil {
-		utils.Fatalf("Error requiring web3: %v", err)
-	}
-
-	_, err = js.re.Run("var web3 = new Web3(jeth);")
-	if err != nil {
-		utils.Fatalf("Error setting web3 provider: %v", err)
-	}
-
-	// load only supported API's in javascript runtime
-	shortcuts := "var eth = web3.eth; var personal = web3.personal; "
-	for _, apiName := range apiNames {
-		if apiName == "web3" {
-			continue // manually mapped or ignore
-		}
-
-		if jsFile, ok := web3ext.Modules[apiName]; ok {
-			if err = js.re.Compile(fmt.Sprintf("%s.js", apiName), jsFile); err == nil {
-				shortcuts += fmt.Sprintf("var %s = web3.%s; ", apiName, apiName)
-			} else {
-				utils.Fatalf("Error loading %s.js: %v", apiName, err)
-			}
-		}
-	}
-
-	_, err = js.re.Run(shortcuts)
-	if err != nil {
-		utils.Fatalf("Error setting namespaces: %v", err)
-	}
-
-	js.re.Run(`var GlobalRegistrar = eth.contract(` + registrar.GlobalRegistrarAbi + `);   registrar = GlobalRegistrar.at("` + registrar.GlobalRegistrarAddr + `");`)
-
-	// overrule some of the methods that require password as input and ask for it interactively
-	p, err := js.re.Get("personal")
-	if err != nil {
-		fmt.Println("Unable to overrule sensitive methods in personal module")
-		return nil
-	}
-
-	// Override the unlockAccount and newAccount methods on the personal object since these require user interaction.
-	// Assign the jeth.unlockAccount and jeth.newAccount in the jsre the original web3 callbacks. These will be called
-	// by the jeth.* methods after they got the password from the user and send the original web3 request to the backend.
-	if persObj := p.Object(); persObj != nil { // make sure the personal api is enabled over the interface
-		js.re.Run(`jeth.unlockAccount = personal.unlockAccount;`)
-		persObj.Set("unlockAccount", jeth.UnlockAccount)
-		js.re.Run(`jeth.newAccount = personal.newAccount;`)
-		persObj.Set("newAccount", jeth.NewAccount)
-	}
-
-	// The admin.sleep and admin.sleepBlocks are offered by the console and not by the RPC layer.
-	// Bind these if the admin module is available.
-	if a, err := js.re.Get("admin"); err == nil {
-		if adminObj := a.Object(); adminObj != nil {
-			adminObj.Set("sleepBlocks", jeth.SleepBlocks)
-			adminObj.Set("sleep", jeth.Sleep)
-		}
-	}
-
-	return nil
-}
-
-func (self *jsre) AskPassword() (string, bool) {
-	pass, err := utils.Stdin.PasswordPrompt("Passphrase: ")
-	if err != nil {
-		return "", false
-	}
-	return pass, true
-}
-
-func (self *jsre) ConfirmTransaction(tx string) bool {
-	// Retrieve the Ethereum instance from the node
-	var ethereum *eth.Ethereum
-	if err := self.stack.Service(&ethereum); err != nil {
-		return false
-	}
-	// If natspec is enabled, ask for permission
-	if ethereum.NatSpec && false /* disabled for now */ {
-		//		notice := natspec.GetNotice(self.xeth, tx, ethereum.HTTPClient())
-		//		fmt.Println(notice)
-		//		answer, _ := self.Prompt("Confirm Transaction [y/n]")
-		//		return strings.HasPrefix(strings.Trim(answer, " "), "y")
-	}
-	return true
-}
-
-func (self *jsre) UnlockAccount(addr []byte) bool {
-	fmt.Printf("Please unlock account %x.\n", addr)
-	pass, err := utils.Stdin.PasswordPrompt("Passphrase: ")
-	if err != nil {
-		return false
-	}
-	// TODO: allow retry
-	var ethereum *eth.Ethereum
-	if err := self.stack.Service(&ethereum); err != nil {
-		return false
-	}
-	a := accounts.Account{Address: common.BytesToAddress(addr)}
-	if err := ethereum.AccountManager().Unlock(a, pass); err != nil {
-		return false
-	} else {
-		fmt.Println("Account is now unlocked for this session.")
-		return true
-	}
-}
-
-// preloadJSFiles loads JS files that the user has specified with ctx.PreLoadJSFlag into
-// the JSRE. If not all files could be loaded it will return an error describing the error.
-func (self *jsre) preloadJSFiles(ctx *cli.Context) error {
-	if ctx.GlobalString(utils.PreLoadJSFlag.Name) != "" {
-		assetPath := ctx.GlobalString(utils.JSpathFlag.Name)
-		jsFiles := strings.Split(ctx.GlobalString(utils.PreLoadJSFlag.Name), ",")
-		for _, file := range jsFiles {
-			filename := common.AbsolutePath(assetPath, strings.TrimSpace(file))
-			if err := self.re.Exec(filename); err != nil {
-				return fmt.Errorf("%s: %v", file, jsErrorString(err))
-			}
-		}
-	}
-	return nil
-}
-
-// jsErrorString adds a backtrace to errors generated by otto.
-func jsErrorString(err error) string {
-	if ottoErr, ok := err.(*otto.Error); ok {
-		return ottoErr.String()
-	}
-	return err.Error()
-}
-
-func (self *jsre) interactive() {
-	// Read input lines.
-	prompt := make(chan string)
-	inputln := make(chan string)
-	go func() {
-		defer close(inputln)
-		for {
-			line, err := utils.Stdin.Prompt(<-prompt)
-			if err != nil {
-				if err == liner.ErrPromptAborted { // ctrl-C
-					self.resetPrompt()
-					inputln <- ""
-					continue
-				}
-				return
-			}
-			inputln <- line
-		}
-	}()
-	// Wait for Ctrl-C, too.
-	sig := make(chan os.Signal, 1)
-	signal.Notify(sig, os.Interrupt)
-
-	defer func() {
-		if self.atexit != nil {
-			self.atexit()
-		}
-		self.re.Stop(false)
-	}()
-	for {
-		prompt <- self.ps1
-		select {
-		case <-sig:
-			fmt.Println("caught interrupt, exiting")
-			return
-		case input, ok := <-inputln:
-			if !ok || indentCount <= 0 && exit.MatchString(input) {
-				return
-			}
-			if onlyws.MatchString(input) {
-				continue
-			}
-			str += input + "\n"
-			self.setIndent()
-			if indentCount <= 0 {
-				if !excludeFromHistory(str) {
-					utils.Stdin.AppendHistory(str[:len(str)-1])
-				}
-				self.parseInput(str)
-				str = ""
-			}
-		}
-	}
-}
-
-func excludeFromHistory(input string) bool {
-	return len(input) == 0 || input[0] == ' ' || passwordRegexp.MatchString(input)
-}
-
-func (self *jsre) withHistory(datadir string, op func(*os.File)) {
-	hist, err := os.OpenFile(filepath.Join(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)
-		}
-	}()
-	if err := self.re.EvalAndPrettyPrint(code); err != nil {
-		if ottoErr, ok := err.(*otto.Error); ok {
-			fmt.Println(ottoErr.String())
-		} else {
-			fmt.Println(err)
-		}
-		return
-	}
-}
-
-var indentCount = 0
-var str = ""
-
-func (self *jsre) resetPrompt() {
-	indentCount = 0
-	str = ""
-	self.ps1 = "> "
-}
-
-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 += " "
-	}
-}
diff --git a/cmd/geth/js_test.go b/cmd/geth/js_test.go
deleted file mode 100644
index ddfe0d400..000000000
--- a/cmd/geth/js_test.go
+++ /dev/null
@@ -1,500 +0,0 @@
-// Copyright 2015 The go-ethereum Authors
-// This file is part of go-ethereum.
-//
-// go-ethereum 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 3 of the License, or
-// (at your option) any later version.
-//
-// go-ethereum 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 go-ethereum. If not, see <http://www.gnu.org/licenses/>.
-
-package main
-
-import (
-	"fmt"
-	"io/ioutil"
-	"math/big"
-	"os"
-	"path/filepath"
-	"regexp"
-	"runtime"
-	"strconv"
-	"testing"
-	"time"
-
-	"github.com/ethereum/go-ethereum/accounts"
-	"github.com/ethereum/go-ethereum/common"
-	"github.com/ethereum/go-ethereum/common/compiler"
-	"github.com/ethereum/go-ethereum/common/httpclient"
-	"github.com/ethereum/go-ethereum/core"
-	"github.com/ethereum/go-ethereum/crypto"
-	"github.com/ethereum/go-ethereum/eth"
-	"github.com/ethereum/go-ethereum/ethdb"
-	"github.com/ethereum/go-ethereum/node"
-)
-
-const (
-	testSolcPath = ""
-	solcVersion  = "0.9.23"
-	testAddress  = "0x8605cdbbdb6d264aa742e77020dcbc58fcdce182"
-	testBalance  = "10000000000000000000"
-	// of empty string
-	testHash = "0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470"
-)
-
-var (
-	versionRE      = regexp.MustCompile(strconv.Quote(`"compilerVersion":"` + solcVersion + `"`))
-	testNodeKey, _ = crypto.HexToECDSA("4b50fa71f5c3eeb8fdc452224b2395af2fcc3d125e06c32c82e048c0559db03f")
-	testAccount, _ = crypto.HexToECDSA("e6fab74a43941f82d89cb7faa408e227cdad3153c4720e540e855c19b15e6674")
-	testGenesis    = `{"` + testAddress[2:] + `": {"balance": "` + testBalance + `"}}`
-)
-
-type testjethre struct {
-	*jsre
-	lastConfirm string
-	client      *httpclient.HTTPClient
-}
-
-// Temporary disabled while natspec hasn't been migrated
-//func (self *testjethre) ConfirmTransaction(tx string) bool {
-//	var ethereum *eth.Ethereum
-//	self.stack.Service(&ethereum)
-//
-//	if ethereum.NatSpec {
-//		self.lastConfirm = natspec.GetNotice(self.xeth, tx, self.client)
-//	}
-//	return true
-//}
-
-func testJEthRE(t *testing.T) (string, *testjethre, *node.Node) {
-	return testREPL(t, nil)
-}
-
-func testREPL(t *testing.T, config func(*eth.Config)) (string, *testjethre, *node.Node) {
-	tmp, err := ioutil.TempDir("", "geth-test")
-	if err != nil {
-		t.Fatal(err)
-	}
-	// Create a networkless protocol stack
-	stack, err := node.New(&node.Config{DataDir: tmp, PrivateKey: testNodeKey, Name: "test", NoDiscovery: true})
-	if err != nil {
-		t.Fatalf("failed to create node: %v", err)
-	}
-	// Initialize and register the Ethereum protocol
-	accman := accounts.NewPlaintextManager(filepath.Join(tmp, "keystore"))
-	db, _ := ethdb.NewMemDatabase()
-	core.WriteGenesisBlockForTesting(db, core.GenesisAccount{
-		Address: common.HexToAddress(testAddress),
-		Balance: common.String2Big(testBalance),
-	})
-	ethConf := &eth.Config{
-		ChainConfig:      &core.ChainConfig{HomesteadBlock: new(big.Int)},
-		TestGenesisState: db,
-		AccountManager:   accman,
-		DocRoot:          "/",
-		SolcPath:         testSolcPath,
-		PowTest:          true,
-	}
-	if config != nil {
-		config(ethConf)
-	}
-	if err := stack.Register(func(ctx *node.ServiceContext) (node.Service, error) {
-		return eth.New(ctx, ethConf)
-	}); err != nil {
-		t.Fatalf("failed to register ethereum protocol: %v", err)
-	}
-	// Initialize all the keys for testing
-	a, err := accman.ImportECDSA(testAccount, "")
-	if err != nil {
-		t.Fatal(err)
-	}
-	if err := accman.Unlock(a, ""); err != nil {
-		t.Fatal(err)
-	}
-	// Start the node and assemble the REPL tester
-	if err := stack.Start(); err != nil {
-		t.Fatalf("failed to start test stack: %v", err)
-	}
-	var ethereum *eth.Ethereum
-	stack.Service(&ethereum)
-
-	assetPath := filepath.Join(os.Getenv("GOPATH"), "src", "github.com", "ethereum", "go-ethereum", "cmd", "mist", "assets", "ext")
-	client, err := stack.Attach()
-	if err != nil {
-		t.Fatalf("failed to attach to node: %v", err)
-	}
-	tf := &testjethre{client: ethereum.HTTPClient()}
-	repl := newJSRE(stack, assetPath, "", client, false)
-	tf.jsre = repl
-	return tmp, tf, stack
-}
-
-func TestNodeInfo(t *testing.T) {
-	t.Skip("broken after p2p update")
-	tmp, repl, ethereum := testJEthRE(t)
-	defer ethereum.Stop()
-	defer os.RemoveAll(tmp)
-
-	want := `{"DiscPort":0,"IP":"0.0.0.0","ListenAddr":"","Name":"test","NodeID":"4cb2fc32924e94277bf94b5e4c983beedb2eabd5a0bc941db32202735c6625d020ca14a5963d1738af43b6ac0a711d61b1a06de931a499fe2aa0b1a132a902b5","NodeUrl":"enode://4cb2fc32924e94277bf94b5e4c983beedb2eabd5a0bc941db32202735c6625d020ca14a5963d1738af43b6ac0a711d61b1a06de931a499fe2aa0b1a132a902b5@0.0.0.0:0","TCPPort":0,"Td":"131072"}`
-	checkEvalJSON(t, repl, `admin.nodeInfo`, want)
-}
-
-func TestAccounts(t *testing.T) {
-	tmp, repl, node := testJEthRE(t)
-	defer node.Stop()
-	defer os.RemoveAll(tmp)
-
-	checkEvalJSON(t, repl, `eth.accounts`, `["`+testAddress+`"]`)
-	checkEvalJSON(t, repl, `eth.coinbase`, `"`+testAddress+`"`)
-	val, err := repl.re.Run(`jeth.newAccount("password")`)
-	if err != nil {
-		t.Errorf("expected no error, got %v", err)
-	}
-	addr := val.String()
-	if !regexp.MustCompile(`0x[0-9a-f]{40}`).MatchString(addr) {
-		t.Errorf("address not hex: %q", addr)
-	}
-
-	checkEvalJSON(t, repl, `eth.accounts`, `["`+testAddress+`","`+addr+`"]`)
-
-}
-
-func TestBlockChain(t *testing.T) {
-	tmp, repl, node := testJEthRE(t)
-	defer node.Stop()
-	defer os.RemoveAll(tmp)
-	// get current block dump before export/import.
-	val, err := repl.re.Run("JSON.stringify(debug.dumpBlock(eth.blockNumber))")
-	if err != nil {
-		t.Errorf("expected no error, got %v", err)
-	}
-	beforeExport := val.String()
-
-	// do the export
-	extmp, err := ioutil.TempDir("", "geth-test-export")
-	if err != nil {
-		t.Fatal(err)
-	}
-	defer os.RemoveAll(extmp)
-	tmpfile := filepath.Join(extmp, "export.chain")
-	tmpfileq := strconv.Quote(tmpfile)
-
-	var ethereum *eth.Ethereum
-	node.Service(&ethereum)
-	ethereum.BlockChain().Reset()
-
-	checkEvalJSON(t, repl, `admin.exportChain(`+tmpfileq+`)`, `true`)
-	if _, err := os.Stat(tmpfile); err != nil {
-		t.Fatal(err)
-	}
-
-	// check import, verify that dumpBlock gives the same result.
-	checkEvalJSON(t, repl, `admin.importChain(`+tmpfileq+`)`, `true`)
-	checkEvalJSON(t, repl, `debug.dumpBlock(eth.blockNumber)`, beforeExport)
-}
-
-func TestMining(t *testing.T) {
-	tmp, repl, node := testJEthRE(t)
-	defer node.Stop()
-	defer os.RemoveAll(tmp)
-	checkEvalJSON(t, repl, `eth.mining`, `false`)
-}
-
-func TestRPC(t *testing.T) {
-	tmp, repl, node := testJEthRE(t)
-	defer node.Stop()
-	defer os.RemoveAll(tmp)
-
-	checkEvalJSON(t, repl, `admin.startRPC("127.0.0.1", 5004, "*", "web3,eth,net")`, `true`)
-}
-
-func TestCheckTestAccountBalance(t *testing.T) {
-	t.Skip() // i don't think it tests the correct behaviour here. it's actually testing
-	// internals which shouldn't be tested. This now fails because of a change in the core
-	// and i have no means to fix this, sorry - @obscuren
-	tmp, repl, node := testJEthRE(t)
-	defer node.Stop()
-	defer os.RemoveAll(tmp)
-
-	repl.re.Run(`primary = "` + testAddress + `"`)
-	checkEvalJSON(t, repl, `eth.getBalance(primary)`, `"`+testBalance+`"`)
-}
-
-func TestSignature(t *testing.T) {
-	tmp, repl, node := testJEthRE(t)
-	defer node.Stop()
-	defer os.RemoveAll(tmp)
-
-	val, err := repl.re.Run(`eth.sign("` + testAddress + `", "` + testHash + `")`)
-
-	// This is a very preliminary test, lacking actual signature verification
-	if err != nil {
-		t.Errorf("Error running js: %v", err)
-		return
-	}
-	output := val.String()
-	t.Logf("Output: %v", output)
-
-	regex := regexp.MustCompile(`^0x[0-9a-f]{130}$`)
-	if !regex.MatchString(output) {
-		t.Errorf("Signature is not 65 bytes represented in hexadecimal.")
-		return
-	}
-}
-
-func TestContract(t *testing.T) {
-	t.Skip("contract testing is implemented with mining in ethash test mode. This takes about 7seconds to run. Unskip and run on demand")
-	coinbase := common.HexToAddress(testAddress)
-	tmp, repl, ethereum := testREPL(t, func(conf *eth.Config) {
-		conf.Etherbase = coinbase
-		conf.PowTest = true
-	})
-	if err := ethereum.Start(); err != nil {
-		t.Errorf("error starting ethereum: %v", err)
-		return
-	}
-	defer ethereum.Stop()
-	defer os.RemoveAll(tmp)
-
-	// Temporary disabled while registrar isn't migrated
-	//reg := registrar.New(repl.xeth)
-	//_, err := reg.SetGlobalRegistrar("", coinbase)
-	//if err != nil {
-	//	t.Errorf("error setting HashReg: %v", err)
-	//}
-	//_, err = reg.SetHashReg("", coinbase)
-	//if err != nil {
-	//	t.Errorf("error setting HashReg: %v", err)
-	//}
-	//_, err = reg.SetUrlHint("", coinbase)
-	//if err != nil {
-	//	t.Errorf("error setting HashReg: %v", err)
-	//}
-	/* TODO:
-	* lookup receipt and contract addresses by tx hash
-	* name registration for HashReg and UrlHint addresses
-	* mine those transactions
-	* then set once more SetHashReg SetUrlHint
-	 */
-
-	source := `contract test {\n` +
-		"   /// @notice Will multiply `a` by 7." + `\n` +
-		`   function multiply(uint a) returns(uint d) {\n` +
-		`       return a * 7;\n` +
-		`   }\n` +
-		`}\n`
-
-	if checkEvalJSON(t, repl, `admin.stopNatSpec()`, `true`) != nil {
-		return
-	}
-
-	contractInfo, err := ioutil.ReadFile("info_test.json")
-	if err != nil {
-		t.Fatalf("%v", err)
-	}
-	if checkEvalJSON(t, repl, `primary = eth.accounts[0]`, `"`+testAddress+`"`) != nil {
-		return
-	}
-	if checkEvalJSON(t, repl, `source = "`+source+`"`, `"`+source+`"`) != nil {
-		return
-	}
-
-	// if solc is found with right version, test it, otherwise read from file
-	sol, err := compiler.New("")
-	if err != nil {
-		t.Logf("solc not found: mocking contract compilation step")
-	} else if sol.Version() != solcVersion {
-		t.Logf("WARNING: solc different version found (%v, test written for %v, may need to update)", sol.Version(), solcVersion)
-	}
-
-	if err != nil {
-		info, err := ioutil.ReadFile("info_test.json")
-		if err != nil {
-			t.Fatalf("%v", err)
-		}
-		_, err = repl.re.Run(`contract = JSON.parse(` + strconv.Quote(string(info)) + `)`)
-		if err != nil {
-			t.Errorf("%v", err)
-		}
-	} else {
-		if checkEvalJSON(t, repl, `contract = eth.compile.solidity(source).test`, string(contractInfo)) != nil {
-			return
-		}
-	}
-
-	if checkEvalJSON(t, repl, `contract.code`, `"0x605880600c6000396000f3006000357c010000000000000000000000000000000000000000000000000000000090048063c6888fa114602e57005b603d6004803590602001506047565b8060005260206000f35b60006007820290506053565b91905056"`) != nil {
-		return
-	}
-
-	if checkEvalJSON(
-		t, repl,
-		`contractaddress = eth.sendTransaction({from: primary, data: contract.code})`,
-		`"0x46d69d55c3c4b86a924a92c9fc4720bb7bce1d74"`,
-	) != nil {
-		return
-	}
-
-	if !processTxs(repl, t, 8) {
-		return
-	}
-
-	callSetup := `abiDef = JSON.parse('[{"constant":false,"inputs":[{"name":"a","type":"uint256"}],"name":"multiply","outputs":[{"name":"d","type":"uint256"}],"type":"function"}]');
-Multiply7 = eth.contract(abiDef);
-multiply7 = Multiply7.at(contractaddress);
-`
-	_, err = repl.re.Run(callSetup)
-	if err != nil {
-		t.Errorf("unexpected error setting up contract, got %v", err)
-		return
-	}
-
-	expNotice := ""
-	if repl.lastConfirm != expNotice {
-		t.Errorf("incorrect confirmation message: expected %v, got %v", expNotice, repl.lastConfirm)
-		return
-	}
-
-	if checkEvalJSON(t, repl, `admin.startNatSpec()`, `true`) != nil {
-		return
-	}
-	if checkEvalJSON(t, repl, `multiply7.multiply.sendTransaction(6, { from: primary })`, `"0x4ef9088431a8033e4580d00e4eb2487275e031ff4163c7529df0ef45af17857b"`) != nil {
-		return
-	}
-
-	if !processTxs(repl, t, 1) {
-		return
-	}
-
-	expNotice = `About to submit transaction (no NatSpec info found for contract: content hash not found for '0x87e2802265838c7f14bb69eecd2112911af6767907a702eeaa445239fb20711b'): {"params":[{"to":"0x46d69d55c3c4b86a924a92c9fc4720bb7bce1d74","data": "0xc6888fa10000000000000000000000000000000000000000000000000000000000000006"}]}`
-	if repl.lastConfirm != expNotice {
-		t.Errorf("incorrect confirmation message: expected\n%v, got\n%v", expNotice, repl.lastConfirm)
-		return
-	}
-
-	var contentHash = `"0x86d2b7cf1e72e9a7a3f8d96601f0151742a2f780f1526414304fbe413dc7f9bd"`
-	if sol != nil && solcVersion != sol.Version() {
-		modContractInfo := versionRE.ReplaceAll(contractInfo, []byte(`"compilerVersion":"`+sol.Version()+`"`))
-		fmt.Printf("modified contractinfo:\n%s\n", modContractInfo)
-		contentHash = `"` + common.ToHex(crypto.Keccak256([]byte(modContractInfo))) + `"`
-	}
-	if checkEvalJSON(t, repl, `filename = "/tmp/info.json"`, `"/tmp/info.json"`) != nil {
-		return
-	}
-	if checkEvalJSON(t, repl, `contentHash = admin.saveInfo(contract.info, filename)`, contentHash) != nil {
-		return
-	}
-	if checkEvalJSON(t, repl, `admin.register(primary, contractaddress, contentHash)`, `true`) != nil {
-		return
-	}
-	if checkEvalJSON(t, repl, `admin.registerUrl(primary, contentHash, "file://"+filename)`, `true`) != nil {
-		return
-	}
-
-	if checkEvalJSON(t, repl, `admin.startNatSpec()`, `true`) != nil {
-		return
-	}
-
-	if !processTxs(repl, t, 3) {
-		return
-	}
-
-	if checkEvalJSON(t, repl, `multiply7.multiply.sendTransaction(6, { from: primary })`, `"0x66d7635c12ad0b231e66da2f987ca3dfdca58ffe49c6442aa55960858103fd0c"`) != nil {
-		return
-	}
-
-	if !processTxs(repl, t, 1) {
-		return
-	}
-
-	expNotice = "Will multiply 6 by 7."
-	if repl.lastConfirm != expNotice {
-		t.Errorf("incorrect confirmation message: expected\n%v, got\n%v", expNotice, repl.lastConfirm)
-		return
-	}
-}
-
-func pendingTransactions(repl *testjethre, t *testing.T) (txc int64, err error) {
-	var ethereum *eth.Ethereum
-	repl.stack.Service(&ethereum)
-
-	txs := ethereum.TxPool().GetTransactions()
-	return int64(len(txs)), nil
-}
-
-func processTxs(repl *testjethre, t *testing.T, expTxc int) bool {
-	var txc int64
-	var err error
-	for i := 0; i < 50; i++ {
-		txc, err = pendingTransactions(repl, t)
-		if err != nil {
-			t.Errorf("unexpected error checking pending transactions: %v", err)
-			return false
-		}
-		if expTxc < int(txc) {
-			t.Errorf("too many pending transactions: expected %v, got %v", expTxc, txc)
-			return false
-		} else if expTxc == int(txc) {
-			break
-		}
-		time.Sleep(100 * time.Millisecond)
-	}
-	if int(txc) != expTxc {
-		t.Errorf("incorrect number of pending transactions, expected %v, got %v", expTxc, txc)
-		return false
-	}
-	var ethereum *eth.Ethereum
-	repl.stack.Service(&ethereum)
-
-	err = ethereum.StartMining(runtime.NumCPU(), "")
-	if err != nil {
-		t.Errorf("unexpected error mining: %v", err)
-		return false
-	}
-	defer ethereum.StopMining()
-
-	timer := time.NewTimer(100 * time.Second)
-	blockNr := ethereum.BlockChain().CurrentBlock().Number()
-	height := new(big.Int).Add(blockNr, big.NewInt(1))
-	repl.wait <- height
-	select {
-	case <-timer.C:
-		// if times out make sure the xeth loop does not block
-		go func() {
-			select {
-			case repl.wait <- nil:
-			case <-repl.wait:
-			}
-		}()
-	case <-repl.wait:
-	}
-	txc, err = pendingTransactions(repl, t)
-	if err != nil {
-		t.Errorf("unexpected error checking pending transactions: %v", err)
-		return false
-	}
-	if txc != 0 {
-		t.Errorf("%d trasactions were not mined", txc)
-		return false
-	}
-	return true
-}
-
-func checkEvalJSON(t *testing.T, re *testjethre, expr, want string) error {
-	val, err := re.re.Run("JSON.stringify(" + expr + ")")
-	if err == nil && val.String() != want {
-		err = fmt.Errorf("Output mismatch for `%s`:\ngot:  %s\nwant: %s", expr, val.String(), want)
-	}
-	if err != nil {
-		_, file, line, _ := runtime.Caller(1)
-		file = filepath.Base(file)
-		fmt.Printf("\t%s:%d: %v\n", file, line, err)
-		t.Fail()
-	}
-	return err
-}
diff --git a/cmd/geth/main.go b/cmd/geth/main.go
index 68aa7d45f..5ff1a7368 100644
--- a/cmd/geth/main.go
+++ b/cmd/geth/main.go
@@ -22,7 +22,6 @@ import (
 	"fmt"
 	"io/ioutil"
 	"os"
-	"os/signal"
 	"path/filepath"
 	"runtime"
 	"strconv"
@@ -33,6 +32,7 @@ import (
 	"github.com/ethereum/ethash"
 	"github.com/ethereum/go-ethereum/cmd/utils"
 	"github.com/ethereum/go-ethereum/common"
+	"github.com/ethereum/go-ethereum/console"
 	"github.com/ethereum/go-ethereum/core"
 	"github.com/ethereum/go-ethereum/eth"
 	"github.com/ethereum/go-ethereum/ethdb"
@@ -95,6 +95,9 @@ func init() {
 		monitorCommand,
 		accountCommand,
 		walletCommand,
+		consoleCommand,
+		attachCommand,
+		javascriptCommand,
 		{
 			Action: makedag,
 			Name:   "makedag",
@@ -140,36 +143,6 @@ This is a destructive action and changes the network in which you will be
 participating.
 `,
 		},
-		{
-			Action: console,
-			Name:   "console",
-			Usage:  `Geth Console: interactive JavaScript environment`,
-			Description: `
-The Geth console is an interactive shell for the JavaScript runtime environment
-which exposes a node admin interface as well as the Ðapp JavaScript API.
-See https://github.com/ethereum/go-ethereum/wiki/Javascipt-Console
-`,
-		},
-		{
-			Action: attach,
-			Name:   "attach",
-			Usage:  `Geth Console: interactive JavaScript environment (connect to node)`,
-			Description: `
-		The Geth console is an interactive shell for the JavaScript runtime environment
-		which exposes a node admin interface as well as the Ðapp JavaScript API.
-		See https://github.com/ethereum/go-ethereum/wiki/Javascipt-Console.
-		This command allows to open a console on a running geth node.
-		`,
-		},
-		{
-			Action: execScripts,
-			Name:   "js",
-			Usage:  `executes the given JavaScript files in the Geth JavaScript VM`,
-			Description: `
-The JavaScript VM exposes a node admin interface as well as the Ðapp
-JavaScript API. See https://github.com/ethereum/go-ethereum/wiki/Javascipt-Console
-`,
-		},
 	}
 
 	app.Flags = []cli.Flag{
@@ -214,7 +187,7 @@ JavaScript API. See https://github.com/ethereum/go-ethereum/wiki/Javascipt-Conso
 		utils.IPCApiFlag,
 		utils.IPCPathFlag,
 		utils.ExecFlag,
-		utils.PreLoadJSFlag,
+		utils.PreloadJSFlag,
 		utils.WhisperEnabledFlag,
 		utils.DevModeFlag,
 		utils.TestNetFlag,
@@ -263,7 +236,7 @@ JavaScript API. See https://github.com/ethereum/go-ethereum/wiki/Javascipt-Conso
 	app.After = func(ctx *cli.Context) error {
 		logger.Flush()
 		debug.Exit()
-		utils.Stdin.Close() // Resets terminal mode.
+		console.Stdin.Close() // Resets terminal mode.
 		return nil
 	}
 }
@@ -304,36 +277,6 @@ func geth(ctx *cli.Context) {
 	node.Wait()
 }
 
-// attach will connect to a running geth instance attaching a JavaScript console and to it.
-func attach(ctx *cli.Context) {
-	// attach to a running geth instance
-	client, err := utils.NewRemoteRPCClient(ctx)
-	if err != nil {
-		utils.Fatalf("Unable to attach to geth: %v", err)
-	}
-
-	repl := newLightweightJSRE(
-		ctx.GlobalString(utils.JSpathFlag.Name),
-		client,
-		ctx.GlobalString(utils.DataDirFlag.Name),
-		true,
-	)
-
-	// preload user defined JS files into the console
-	err = repl.preloadJSFiles(ctx)
-	if err != nil {
-		utils.Fatalf("unable to preload JS file %v", err)
-	}
-
-	// in case the exec flag holds a JS statement execute it and return
-	if ctx.GlobalString(utils.ExecFlag.Name) != "" {
-		repl.batch(ctx.GlobalString(utils.ExecFlag.Name))
-	} else {
-		repl.welcome()
-		repl.interactive()
-	}
-}
-
 // initGenesis will initialise the given JSON format genesis file and writes it as
 // the zero'd block (i.e. genesis) or will fail hard if it can't succeed.
 func initGenesis(ctx *cli.Context) {
@@ -359,77 +302,6 @@ func initGenesis(ctx *cli.Context) {
 	glog.V(logger.Info).Infof("successfully wrote genesis block and/or chain rule set: %x", block.Hash())
 }
 
-// console starts a new geth node, attaching a JavaScript console to it at the
-// same time.
-func console(ctx *cli.Context) {
-	// Create and start the node based on the CLI flags
-	node := utils.MakeSystemNode(clientIdentifier, verString, relConfig, makeDefaultExtra(), ctx)
-	startNode(ctx, node)
-
-	// Attach to the newly started node, and either execute script or become interactive
-	client, err := node.Attach()
-	if err != nil {
-		utils.Fatalf("Failed to attach to the inproc geth: %v", err)
-	}
-	repl := newJSRE(node,
-		ctx.GlobalString(utils.JSpathFlag.Name),
-		ctx.GlobalString(utils.RPCCORSDomainFlag.Name),
-		client, true)
-
-	// preload user defined JS files into the console
-	err = repl.preloadJSFiles(ctx)
-	if err != nil {
-		utils.Fatalf("%v", err)
-	}
-
-	// in case the exec flag holds a JS statement execute it and return
-	if script := ctx.GlobalString(utils.ExecFlag.Name); script != "" {
-		repl.batch(script)
-	} else {
-		repl.welcome()
-		repl.interactive()
-	}
-	node.Stop()
-}
-
-// execScripts starts a new geth node based on the CLI flags, and executes each
-// of the JavaScript files specified as command arguments.
-func execScripts(ctx *cli.Context) {
-	// Create and start the node based on the CLI flags
-	node := utils.MakeSystemNode(clientIdentifier, verString, relConfig, makeDefaultExtra(), ctx)
-	startNode(ctx, node)
-	defer node.Stop()
-
-	// Attach to the newly started node and execute the given scripts
-	client, err := node.Attach()
-	if err != nil {
-		utils.Fatalf("Failed to attach to the inproc geth: %v", err)
-	}
-	repl := newJSRE(node,
-		ctx.GlobalString(utils.JSpathFlag.Name),
-		ctx.GlobalString(utils.RPCCORSDomainFlag.Name),
-		client, false)
-
-	// Run all given files.
-	for _, file := range ctx.Args() {
-		if err = repl.re.Exec(file); err != nil {
-			break
-		}
-	}
-	if err != nil {
-		utils.Fatalf("JavaScript Error: %v", jsErrorString(err))
-	}
-	// JS files loaded successfully.
-	// Wait for pending callbacks, but stop for Ctrl-C.
-	abort := make(chan os.Signal, 1)
-	signal.Notify(abort, os.Interrupt)
-	go func() {
-		<-abort
-		repl.re.Stop(false)
-	}()
-	repl.re.Stop(true)
-}
-
 // startNode boots up the system node and all registered protocols, after which
 // it unlocks any requested accounts, and starts the RPC/IPC interfaces and the
 // miner.
diff --git a/cmd/geth/run_test.go b/cmd/geth/run_test.go
index ba4ce0c60..f6bc3f869 100644
--- a/cmd/geth/run_test.go
+++ b/cmd/geth/run_test.go
@@ -45,6 +45,7 @@ type testgeth struct {
 	// template variables for expect
 	Datadir    string
 	Executable string
+	Etherbase  string
 	Func       template.FuncMap
 
 	removeDatadir bool
@@ -67,11 +68,15 @@ func init() {
 func runGeth(t *testing.T, args ...string) *testgeth {
 	tt := &testgeth{T: t, Executable: os.Args[0]}
 	for i, arg := range args {
-		if arg == "-datadir" || arg == "--datadir" {
+		switch {
+		case arg == "-datadir" || arg == "--datadir":
 			if i < len(args)-1 {
 				tt.Datadir = args[i+1]
 			}
-			break
+		case arg == "-etherbase" || arg == "--etherbase":
+			if i < len(args)-1 {
+				tt.Etherbase = args[i+1]
+			}
 		}
 	}
 	if tt.Datadir == "" {
diff --git a/cmd/geth/usage.go b/cmd/geth/usage.go
index 90019d7b9..01a71c1f6 100644
--- a/cmd/geth/usage.go
+++ b/cmd/geth/usage.go
@@ -101,7 +101,7 @@ var AppHelpFlagGroups = []flagGroup{
 			utils.RPCCORSDomainFlag,
 			utils.JSpathFlag,
 			utils.ExecFlag,
-			utils.PreLoadJSFlag,
+			utils.PreloadJSFlag,
 		},
 	},
 	{
diff --git a/cmd/utils/flags.go b/cmd/utils/flags.go
index 43dbc37f7..c476e1c77 100644
--- a/cmd/utils/flags.go
+++ b/cmd/utils/flags.go
@@ -302,7 +302,7 @@ var (
 		Name:  "exec",
 		Usage: "Execute JavaScript statement (only in combination with console/attach)",
 	}
-	PreLoadJSFlag = cli.StringFlag{
+	PreloadJSFlag = cli.StringFlag{
 		Name:  "preload",
 		Usage: "Comma separated list of JavaScript files to preload into the console",
 	}
@@ -864,3 +864,20 @@ func MakeChain(ctx *cli.Context) (chain *core.BlockChain, chainDb ethdb.Database
 	}
 	return chain, chainDb
 }
+
+// MakeConsolePreloads retrieves the absolute paths for the console JavaScript
+// scripts to preload before starting.
+func MakeConsolePreloads(ctx *cli.Context) []string {
+	// Skip preloading if there's nothing to preload
+	if ctx.GlobalString(PreloadJSFlag.Name) == "" {
+		return nil
+	}
+	// Otherwise resolve absolute paths and return them
+	preloads := []string{}
+
+	assets := ctx.GlobalString(JSpathFlag.Name)
+	for _, file := range strings.Split(ctx.GlobalString(PreloadJSFlag.Name), ",") {
+		preloads = append(preloads, common.AbsolutePath(assets, strings.TrimSpace(file)))
+	}
+	return preloads
+}
diff --git a/cmd/utils/input.go b/cmd/utils/input.go
deleted file mode 100644
index 523d5a587..000000000
--- a/cmd/utils/input.go
+++ /dev/null
@@ -1,98 +0,0 @@
-// Copyright 2016 The go-ethereum Authors
-// This file is part of go-ethereum.
-//
-// go-ethereum 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 3 of the License, or
-// (at your option) any later version.
-//
-// go-ethereum 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 go-ethereum. If not, see <http://www.gnu.org/licenses/>.
-
-package utils
-
-import (
-	"fmt"
-	"strings"
-
-	"github.com/peterh/liner"
-)
-
-// Holds the stdin line reader.
-// Only this reader may be used for input because it keeps
-// an internal buffer.
-var Stdin = newUserInputReader()
-
-type userInputReader struct {
-	*liner.State
-	warned     bool
-	supported  bool
-	normalMode liner.ModeApplier
-	rawMode    liner.ModeApplier
-}
-
-func newUserInputReader() *userInputReader {
-	r := new(userInputReader)
-	// Get the original mode before calling NewLiner.
-	// This is usually regular "cooked" mode where characters echo.
-	normalMode, _ := liner.TerminalMode()
-	// Turn on liner. It switches to raw mode.
-	r.State = liner.NewLiner()
-	rawMode, err := liner.TerminalMode()
-	if err != nil || !liner.TerminalSupported() {
-		r.supported = false
-	} else {
-		r.supported = true
-		r.normalMode = normalMode
-		r.rawMode = rawMode
-		// Switch back to normal mode while we're not prompting.
-		normalMode.ApplyMode()
-	}
-	return r
-}
-
-func (r *userInputReader) Prompt(prompt string) (string, error) {
-	if r.supported {
-		r.rawMode.ApplyMode()
-		defer r.normalMode.ApplyMode()
-	} else {
-		// liner tries to be smart about printing the prompt
-		// and doesn't print anything if input is redirected.
-		// Un-smart it by printing the prompt always.
-		fmt.Print(prompt)
-		prompt = ""
-		defer fmt.Println()
-	}
-	return r.State.Prompt(prompt)
-}
-
-func (r *userInputReader) PasswordPrompt(prompt string) (passwd string, err error) {
-	if r.supported {
-		r.rawMode.ApplyMode()
-		defer r.normalMode.ApplyMode()
-		return r.State.PasswordPrompt(prompt)
-	}
-	if !r.warned {
-		fmt.Println("!! Unsupported terminal, password will be echoed.")
-		r.warned = true
-	}
-	// Just as in Prompt, handle printing the prompt here instead of relying on liner.
-	fmt.Print(prompt)
-	passwd, err = r.State.Prompt("")
-	fmt.Println()
-	return passwd, err
-}
-
-func (r *userInputReader) ConfirmPrompt(prompt string) (bool, error) {
-	prompt = prompt + " [y/N] "
-	input, err := r.Prompt(prompt)
-	if len(input) > 0 && strings.ToUpper(input[:1]) == "Y" {
-		return true, nil
-	}
-	return false, err
-}
diff --git a/cmd/utils/jeth.go b/cmd/utils/jeth.go
deleted file mode 100644
index 9410180b0..000000000
--- a/cmd/utils/jeth.go
+++ /dev/null
@@ -1,301 +0,0 @@
-// Copyright 2015 The go-ethereum Authors
-// This file is part of go-ethereum.
-//
-// go-ethereum 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 3 of the License, or
-// (at your option) any later version.
-//
-// go-ethereum 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 go-ethereum. If not, see <http://www.gnu.org/licenses/>.
-
-package utils
-
-import (
-	"encoding/json"
-	"fmt"
-	"time"
-
-	"github.com/ethereum/go-ethereum/jsre"
-	"github.com/ethereum/go-ethereum/rpc"
-
-	"github.com/robertkrimen/otto"
-)
-
-type Jeth struct {
-	re     *jsre.JSRE
-	client rpc.Client
-}
-
-// NewJeth create a new backend for the JSRE console
-func NewJeth(re *jsre.JSRE, client rpc.Client) *Jeth {
-	return &Jeth{re, client}
-}
-
-// err returns an error object for the given error code and message.
-func (self *Jeth) err(call otto.FunctionCall, code int, msg string, id interface{}) (response otto.Value) {
-	m := rpc.JSONErrResponse{
-		Version: "2.0",
-		Id:      id,
-		Error: rpc.JSONError{
-			Code:    code,
-			Message: msg,
-		},
-	}
-
-	errObj, _ := json.Marshal(m.Error)
-	errRes, _ := json.Marshal(m)
-
-	call.Otto.Run("ret_error = " + string(errObj))
-	res, _ := call.Otto.Run("ret_response = " + string(errRes))
-
-	return res
-}
-
-// UnlockAccount asks the user for the password and than executes the jeth.UnlockAccount callback in the jsre.
-// It will need the public address for the account to unlock as first argument.
-// The second argument is an optional string with the password. If not given the user is prompted for the password.
-// The third argument is an optional integer which specifies for how long the account will be unlocked (in seconds).
-func (self *Jeth) UnlockAccount(call otto.FunctionCall) (response otto.Value) {
-	var account, passwd otto.Value
-	duration := otto.NullValue()
-
-	if !call.Argument(0).IsString() {
-		fmt.Println("first argument must be the account to unlock")
-		return otto.FalseValue()
-	}
-
-	account = call.Argument(0)
-
-	// if password is not given or as null value -> ask user for password
-	if call.Argument(1).IsUndefined() || call.Argument(1).IsNull() {
-		fmt.Printf("Unlock account %s\n", account)
-		if input, err := Stdin.PasswordPrompt("Passphrase: "); err != nil {
-			throwJSExeception(err.Error())
-		} else {
-			passwd, _ = otto.ToValue(input)
-		}
-	} else {
-		if !call.Argument(1).IsString() {
-			throwJSExeception("password must be a string")
-		}
-		passwd = call.Argument(1)
-	}
-
-	// third argument is the duration how long the account must be unlocked.
-	// verify that its a number.
-	if call.Argument(2).IsDefined() && !call.Argument(2).IsNull() {
-		if !call.Argument(2).IsNumber() {
-			throwJSExeception("unlock duration must be a number")
-		}
-		duration = call.Argument(2)
-	}
-
-	// jeth.unlockAccount will send the request to the backend.
-	if val, err := call.Otto.Call("jeth.unlockAccount", nil, account, passwd, duration); err == nil {
-		return val
-	} else {
-		throwJSExeception(err.Error())
-	}
-
-	return otto.FalseValue()
-}
-
-// NewAccount asks the user for the password and than executes the jeth.newAccount callback in the jsre
-func (self *Jeth) NewAccount(call otto.FunctionCall) (response otto.Value) {
-	var passwd string
-	if len(call.ArgumentList) == 0 {
-		var err error
-		passwd, err = Stdin.PasswordPrompt("Passphrase: ")
-		if err != nil {
-			return otto.FalseValue()
-		}
-		passwd2, err := Stdin.PasswordPrompt("Repeat passphrase: ")
-		if err != nil {
-			return otto.FalseValue()
-		}
-
-		if passwd != passwd2 {
-			fmt.Println("Passphrases don't match")
-			return otto.FalseValue()
-		}
-	} else if len(call.ArgumentList) == 1 && call.Argument(0).IsString() {
-		passwd, _ = call.Argument(0).ToString()
-	} else {
-		fmt.Println("expected 0 or 1 string argument")
-		return otto.FalseValue()
-	}
-
-	ret, err := call.Otto.Call("jeth.newAccount", nil, passwd)
-	if err == nil {
-		return ret
-	}
-	fmt.Println(err)
-	return otto.FalseValue()
-}
-
-// Send will serialize the first argument, send it to the node and returns the response.
-func (self *Jeth) Send(call otto.FunctionCall) (response otto.Value) {
-	// verify we got a batch request (array) or a single request (object)
-	ro := call.Argument(0).Object()
-	if ro == nil || (ro.Class() != "Array" && ro.Class() != "Object") {
-		throwJSExeception("Internal Error: request must be an object or array")
-	}
-
-	// convert otto vm arguments to go values by JSON serialising and parsing.
-	data, err := call.Otto.Call("JSON.stringify", nil, ro)
-	if err != nil {
-		throwJSExeception(err.Error())
-	}
-
-	jsonreq, _ := data.ToString()
-
-	// parse arguments to JSON rpc requests, either to an array (batch) or to a single request.
-	var reqs []rpc.JSONRequest
-	batch := true
-	if err = json.Unmarshal([]byte(jsonreq), &reqs); err != nil {
-		// single request?
-		reqs = make([]rpc.JSONRequest, 1)
-		if err = json.Unmarshal([]byte(jsonreq), &reqs[0]); err != nil {
-			throwJSExeception("invalid request")
-		}
-		batch = false
-	}
-
-	call.Otto.Set("response_len", len(reqs))
-	call.Otto.Run("var ret_response = new Array(response_len);")
-
-	for i, req := range reqs {
-		if err := self.client.Send(&req); err != nil {
-			return self.err(call, -32603, err.Error(), req.Id)
-		}
-
-		result := make(map[string]interface{})
-		if err = self.client.Recv(&result); err != nil {
-			return self.err(call, -32603, err.Error(), req.Id)
-		}
-
-		id, _ := result["id"]
-		jsonver, _ := result["jsonrpc"]
-
-		call.Otto.Set("ret_id", id)
-		call.Otto.Set("ret_jsonrpc", jsonver)
-		call.Otto.Set("response_idx", i)
-
-		// call was successful
-		if res, ok := result["result"]; ok {
-			payload, _ := json.Marshal(res)
-			call.Otto.Set("ret_result", string(payload))
-			response, err = call.Otto.Run(`
-				ret_response[response_idx] = { jsonrpc: ret_jsonrpc, id: ret_id, result: JSON.parse(ret_result) };
-			`)
-			continue
-		}
-
-		// request returned an error
-		if res, ok := result["error"]; ok {
-			payload, _ := json.Marshal(res)
-			call.Otto.Set("ret_result", string(payload))
-			response, err = call.Otto.Run(`
-				ret_response[response_idx] = { jsonrpc: ret_jsonrpc, id: ret_id, error: JSON.parse(ret_result) };
-			`)
-			continue
-		}
-
-		return self.err(call, -32603, fmt.Sprintf("Invalid response"), new(int64))
-	}
-
-	if !batch {
-		call.Otto.Run("ret_response = ret_response[0];")
-	}
-
-	// if a callback was given execute it.
-	if call.Argument(1).IsObject() {
-		call.Otto.Set("callback", call.Argument(1))
-		call.Otto.Run(`
-		if (Object.prototype.toString.call(callback) == '[object Function]') {
-			callback(null, ret_response);
-		}
-		`)
-	}
-
-	return
-}
-
-// throwJSExeception panics on an otto value, the Otto VM will then throw msg as a javascript error.
-func throwJSExeception(msg interface{}) otto.Value {
-	p, _ := otto.ToValue(msg)
-	panic(p)
-}
-
-// Sleep will halt the console for arg[0] seconds.
-func (self *Jeth) Sleep(call otto.FunctionCall) (response otto.Value) {
-	if len(call.ArgumentList) >= 1 {
-		if call.Argument(0).IsNumber() {
-			sleep, _ := call.Argument(0).ToInteger()
-			time.Sleep(time.Duration(sleep) * time.Second)
-			return otto.TrueValue()
-		}
-	}
-	return throwJSExeception("usage: sleep(<sleep in seconds>)")
-}
-
-// SleepBlocks will wait for a specified number of new blocks or max for a
-// given of seconds. sleepBlocks(nBlocks[, maxSleep]).
-func (self *Jeth) SleepBlocks(call otto.FunctionCall) (response otto.Value) {
-	nBlocks := int64(0)
-	maxSleep := int64(9999999999999999) // indefinitely
-
-	nArgs := len(call.ArgumentList)
-
-	if nArgs == 0 {
-		throwJSExeception("usage: sleepBlocks(<n blocks>[, max sleep in seconds])")
-	}
-
-	if nArgs >= 1 {
-		if call.Argument(0).IsNumber() {
-			nBlocks, _ = call.Argument(0).ToInteger()
-		} else {
-			throwJSExeception("expected number as first argument")
-		}
-	}
-
-	if nArgs >= 2 {
-		if call.Argument(1).IsNumber() {
-			maxSleep, _ = call.Argument(1).ToInteger()
-		} else {
-			throwJSExeception("expected number as second argument")
-		}
-	}
-
-	// go through the console, this will allow web3 to call the appropriate
-	// callbacks if a delayed response or notification is received.
-	currentBlockNr := func() int64 {
-		result, err := call.Otto.Run("eth.blockNumber")
-		if err != nil {
-			throwJSExeception(err.Error())
-		}
-		blockNr, err := result.ToInteger()
-		if err != nil {
-			throwJSExeception(err.Error())
-		}
-		return blockNr
-	}
-
-	targetBlockNr := currentBlockNr() + nBlocks
-	deadline := time.Now().Add(time.Duration(maxSleep) * time.Second)
-
-	for time.Now().Before(deadline) {
-		if currentBlockNr() >= targetBlockNr {
-			return otto.TrueValue()
-		}
-		time.Sleep(time.Second)
-	}
-
-	return otto.FalseValue()
-}
diff --git a/console/bridge.go b/console/bridge.go
new file mode 100644
index 000000000..b23e06837
--- /dev/null
+++ b/console/bridge.go
@@ -0,0 +1,317 @@
+// Copyright 2015 The go-ethereum Authors
+// This file is part of the go-ethereum library.
+//
+// The go-ethereum library is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// The go-ethereum 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 Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
+
+package console
+
+import (
+	"encoding/json"
+	"fmt"
+	"io"
+	"time"
+
+	"github.com/ethereum/go-ethereum/logger"
+	"github.com/ethereum/go-ethereum/logger/glog"
+	"github.com/ethereum/go-ethereum/rpc"
+	"github.com/robertkrimen/otto"
+)
+
+// bridge is a collection of JavaScript utility methods to bride the .js runtime
+// environment and the Go RPC connection backing the remote method calls.
+type bridge struct {
+	client   rpc.Client   // RPC client to execute Ethereum requests through
+	prompter UserPrompter // Input prompter to allow interactive user feedback
+	printer  io.Writer    // Output writer to serialize any display strings to
+}
+
+// newBridge creates a new JavaScript wrapper around an RPC client.
+func newBridge(client rpc.Client, prompter UserPrompter, printer io.Writer) *bridge {
+	return &bridge{
+		client:   client,
+		prompter: prompter,
+		printer:  printer,
+	}
+}
+
+// NewAccount is a wrapper around the personal.newAccount RPC method that uses a
+// non-echoing password prompt to aquire the passphrase and executes the original
+// RPC method (saved in jeth.newAccount) with it to actually execute the RPC call.
+func (b *bridge) NewAccount(call otto.FunctionCall) (response otto.Value) {
+	var (
+		password string
+		confirm  string
+		err      error
+	)
+	switch {
+	// No password was specified, prompt the user for it
+	case len(call.ArgumentList) == 0:
+		if password, err = b.prompter.PromptPassword("Passphrase: "); err != nil {
+			throwJSException(err.Error())
+		}
+		if confirm, err = b.prompter.PromptPassword("Repeat passphrase: "); err != nil {
+			throwJSException(err.Error())
+		}
+		if password != confirm {
+			throwJSException("passphrases don't match!")
+		}
+
+	// A single string password was specified, use that
+	case len(call.ArgumentList) == 1 && call.Argument(0).IsString():
+		password, _ = call.Argument(0).ToString()
+
+	// Otherwise fail with some error
+	default:
+		throwJSException("expected 0 or 1 string argument")
+	}
+	// Password aquired, execute the call and return
+	ret, err := call.Otto.Call("jeth.newAccount", nil, password)
+	if err != nil {
+		throwJSException(err.Error())
+	}
+	return ret
+}
+
+// UnlockAccount is a wrapper around the personal.unlockAccount RPC method that
+// uses a non-echoing password prompt to aquire the passphrase and executes the
+// original RPC method (saved in jeth.unlockAccount) with it to actually execute
+// the RPC call.
+func (b *bridge) UnlockAccount(call otto.FunctionCall) (response otto.Value) {
+	// Make sure we have an account specified to unlock
+	if !call.Argument(0).IsString() {
+		throwJSException("first argument must be the account to unlock")
+	}
+	account := call.Argument(0)
+
+	// If password is not given or is the null value, prompt the user for it
+	var passwd otto.Value
+
+	if call.Argument(1).IsUndefined() || call.Argument(1).IsNull() {
+		fmt.Fprintf(b.printer, "Unlock account %s\n", account)
+		if input, err := b.prompter.PromptPassword("Passphrase: "); err != nil {
+			throwJSException(err.Error())
+		} else {
+			passwd, _ = otto.ToValue(input)
+		}
+	} else {
+		if !call.Argument(1).IsString() {
+			throwJSException("password must be a string")
+		}
+		passwd = call.Argument(1)
+	}
+	// Third argument is the duration how long the account must be unlocked.
+	duration := otto.NullValue()
+	if call.Argument(2).IsDefined() && !call.Argument(2).IsNull() {
+		if !call.Argument(2).IsNumber() {
+			throwJSException("unlock duration must be a number")
+		}
+		duration = call.Argument(2)
+	}
+	// Send the request to the backend and return
+	val, err := call.Otto.Call("jeth.unlockAccount", nil, account, passwd, duration)
+	if err != nil {
+		throwJSException(err.Error())
+	}
+	return val
+}
+
+// Sleep will block the console for the specified number of seconds.
+func (b *bridge) Sleep(call otto.FunctionCall) (response otto.Value) {
+	if call.Argument(0).IsNumber() {
+		sleep, _ := call.Argument(0).ToInteger()
+		time.Sleep(time.Duration(sleep) * time.Second)
+		return otto.TrueValue()
+	}
+	return throwJSException("usage: sleep(<number of seconds>)")
+}
+
+// SleepBlocks will block the console for a specified number of new blocks optionally
+// until the given timeout is reached.
+func (b *bridge) SleepBlocks(call otto.FunctionCall) (response otto.Value) {
+	var (
+		blocks = int64(0)
+		sleep  = int64(9999999999999999) // indefinitely
+	)
+	// Parse the input parameters for the sleep
+	nArgs := len(call.ArgumentList)
+	if nArgs == 0 {
+		throwJSException("usage: sleepBlocks(<n blocks>[, max sleep in seconds])")
+	}
+	if nArgs >= 1 {
+		if call.Argument(0).IsNumber() {
+			blocks, _ = call.Argument(0).ToInteger()
+		} else {
+			throwJSException("expected number as first argument")
+		}
+	}
+	if nArgs >= 2 {
+		if call.Argument(1).IsNumber() {
+			sleep, _ = call.Argument(1).ToInteger()
+		} else {
+			throwJSException("expected number as second argument")
+		}
+	}
+	// go through the console, this will allow web3 to call the appropriate
+	// callbacks if a delayed response or notification is received.
+	blockNumber := func() int64 {
+		result, err := call.Otto.Run("eth.blockNumber")
+		if err != nil {
+			throwJSException(err.Error())
+		}
+		block, err := result.ToInteger()
+		if err != nil {
+			throwJSException(err.Error())
+		}
+		return block
+	}
+	// Poll the current block number until either it ot a timeout is reached
+	targetBlockNr := blockNumber() + blocks
+	deadline := time.Now().Add(time.Duration(sleep) * time.Second)
+
+	for time.Now().Before(deadline) {
+		if blockNumber() >= targetBlockNr {
+			return otto.TrueValue()
+		}
+		time.Sleep(time.Second)
+	}
+	return otto.FalseValue()
+}
+
+// Send will serialize the first argument, send it to the node and returns the response.
+func (b *bridge) Send(call otto.FunctionCall) (response otto.Value) {
+	// Ensure that we've got a batch request (array) or a single request (object)
+	arg := call.Argument(0).Object()
+	if arg == nil || (arg.Class() != "Array" && arg.Class() != "Object") {
+		throwJSException("request must be an object or array")
+	}
+	// Convert the otto VM arguments to Go values
+	data, err := call.Otto.Call("JSON.stringify", nil, arg)
+	if err != nil {
+		throwJSException(err.Error())
+	}
+	reqjson, err := data.ToString()
+	if err != nil {
+		throwJSException(err.Error())
+	}
+
+	var (
+		reqs  []rpc.JSONRequest
+		batch = true
+	)
+	if err = json.Unmarshal([]byte(reqjson), &reqs); err != nil {
+		// single request?
+		reqs = make([]rpc.JSONRequest, 1)
+		if err = json.Unmarshal([]byte(reqjson), &reqs[0]); err != nil {
+			throwJSException("invalid request")
+		}
+		batch = false
+	}
+	// Iteratively execute the requests
+	call.Otto.Set("response_len", len(reqs))
+	call.Otto.Run("var ret_response = new Array(response_len);")
+
+	for i, req := range reqs {
+		// Execute the RPC request and parse the reply
+		if err = b.client.Send(&req); err != nil {
+			return newErrorResponse(call, -32603, err.Error(), req.Id)
+		}
+		result := make(map[string]interface{})
+		if err = b.client.Recv(&result); err != nil {
+			return newErrorResponse(call, -32603, err.Error(), req.Id)
+		}
+		// Feed the reply back into the JavaScript runtime environment
+		id, _ := result["id"]
+		jsonver, _ := result["jsonrpc"]
+
+		call.Otto.Set("ret_id", id)
+		call.Otto.Set("ret_jsonrpc", jsonver)
+		call.Otto.Set("response_idx", i)
+
+		if res, ok := result["result"]; ok {
+			payload, _ := json.Marshal(res)
+			call.Otto.Set("ret_result", string(payload))
+			response, err = call.Otto.Run(`
+				ret_response[response_idx] = { jsonrpc: ret_jsonrpc, id: ret_id, result: JSON.parse(ret_result) };
+			`)
+			continue
+		}
+		if res, ok := result["error"]; ok {
+			payload, _ := json.Marshal(res)
+			call.Otto.Set("ret_result", string(payload))
+			response, err = call.Otto.Run(`
+				ret_response[response_idx] = { jsonrpc: ret_jsonrpc, id: ret_id, error: JSON.parse(ret_result) };
+			`)
+			continue
+		}
+		return newErrorResponse(call, -32603, fmt.Sprintf("Invalid response"), new(int64))
+	}
+	// Convert single requests back from batch ones
+	if !batch {
+		call.Otto.Run("ret_response = ret_response[0];")
+	}
+	// Execute any registered callbacks
+	if call.Argument(1).IsObject() {
+		call.Otto.Set("callback", call.Argument(1))
+		call.Otto.Run(`
+		if (Object.prototype.toString.call(callback) == '[object Function]') {
+			callback(null, ret_response);
+		}
+		`)
+	}
+	return
+}
+
+// throwJSException panics on an otto.Value. The Otto VM will recover from the
+// Go panic and throw msg as a JavaScript error.
+func throwJSException(msg interface{}) otto.Value {
+	val, err := otto.ToValue(msg)
+	if err != nil {
+		glog.V(logger.Error).Infof("Failed to serialize JavaScript exception %v: %v", msg, err)
+	}
+	panic(val)
+}
+
+// newErrorResponse creates a JSON RPC error response for a specific request id,
+// containing the specified error code and error message. Beside returning the
+// error to the caller, it also sets the ret_error and ret_response JavaScript
+// variables.
+func newErrorResponse(call otto.FunctionCall, code int, msg string, id interface{}) (response otto.Value) {
+	// Bundle the error into a JSON RPC call response
+	res := rpc.JSONErrResponse{
+		Version: rpc.JSONRPCVersion,
+		Id:      id,
+		Error: rpc.JSONError{
+			Code:    code,
+			Message: msg,
+		},
+	}
+	// Serialize the error response into JavaScript variables
+	errObj, err := json.Marshal(res.Error)
+	if err != nil {
+		glog.V(logger.Error).Infof("Failed to serialize JSON RPC error: %v", err)
+	}
+	resObj, err := json.Marshal(res)
+	if err != nil {
+		glog.V(logger.Error).Infof("Failed to serialize JSON RPC error response: %v", err)
+	}
+
+	if _, err = call.Otto.Run("ret_error = " + string(errObj)); err != nil {
+		glog.V(logger.Error).Infof("Failed to set `ret_error` to the occurred error: %v", err)
+	}
+	resVal, err := call.Otto.Run("ret_response = " + string(resObj))
+	if err != nil {
+		glog.V(logger.Error).Infof("Failed to set `ret_response` to the JSON RPC response: %v", err)
+	}
+	return resVal
+}
diff --git a/console/console.go b/console/console.go
new file mode 100644
index 000000000..a19b267bc
--- /dev/null
+++ b/console/console.go
@@ -0,0 +1,373 @@
+// Copyright 2015 The go-ethereum Authors
+// This file is part of the go-ethereum library.
+//
+// The go-ethereum library is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// The go-ethereum 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 Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
+
+package console
+
+import (
+	"fmt"
+	"io"
+	"io/ioutil"
+	"os"
+	"os/signal"
+	"path/filepath"
+	"regexp"
+	"sort"
+	"strings"
+
+	"github.com/ethereum/go-ethereum/internal/jsre"
+	"github.com/ethereum/go-ethereum/internal/web3ext"
+	"github.com/ethereum/go-ethereum/rpc"
+	"github.com/peterh/liner"
+	"github.com/robertkrimen/otto"
+)
+
+var (
+	passwordRegexp = regexp.MustCompile("personal.[nus]")
+	onlyWhitespace = regexp.MustCompile("^\\s*$")
+	exit           = regexp.MustCompile("^\\s*exit\\s*;*\\s*$")
+)
+
+// HistoryFile is the file within the data directory to store input scrollback.
+const HistoryFile = "history"
+
+// DefaultPrompt is the default prompt line prefix to use for user input querying.
+const DefaultPrompt = "> "
+
+// Config is te collection of configurations to fine tune the behavior of the
+// JavaScript console.
+type Config struct {
+	DataDir  string       // Data directory to store the console history at
+	DocRoot  string       // Filesystem path from where to load JavaScript files from
+	Client   rpc.Client   // RPC client to execute Ethereum requests through
+	Prompt   string       // Input prompt prefix string (defaults to DefaultPrompt)
+	Prompter UserPrompter // Input prompter to allow interactive user feedback (defaults to TerminalPrompter)
+	Printer  io.Writer    // Output writer to serialize any display strings to (defaults to os.Stdout)
+	Preload  []string     // Absolute paths to JavaScript files to preload
+}
+
+// Console is a JavaScript interpreted runtime environment. It is a fully fleged
+// JavaScript console attached to a running node via an external or in-process RPC
+// client.
+type Console struct {
+	client   rpc.Client   // RPC client to execute Ethereum requests through
+	jsre     *jsre.JSRE   // JavaScript runtime environment running the interpreter
+	prompt   string       // Input prompt prefix string
+	prompter UserPrompter // Input prompter to allow interactive user feedback
+	histPath string       // Absolute path to the console scrollback history
+	history  []string     // Scroll history maintained by the console
+	printer  io.Writer    // Output writer to serialize any display strings to
+}
+
+func New(config Config) (*Console, error) {
+	// Handle unset config values gracefully
+	if config.Prompter == nil {
+		config.Prompter = Stdin
+	}
+	if config.Prompt == "" {
+		config.Prompt = DefaultPrompt
+	}
+	if config.Printer == nil {
+		config.Printer = os.Stdout
+	}
+	// Initialize the console and return
+	console := &Console{
+		client:   config.Client,
+		jsre:     jsre.New(config.DocRoot, config.Printer),
+		prompt:   config.Prompt,
+		prompter: config.Prompter,
+		printer:  config.Printer,
+		histPath: filepath.Join(config.DataDir, HistoryFile),
+	}
+	if err := console.init(config.Preload); err != nil {
+		return nil, err
+	}
+	return console, nil
+}
+
+// init retrieves the available APIs from the remote RPC provider and initializes
+// the console's JavaScript namespaces based on the exposed modules.
+func (c *Console) init(preload []string) error {
+	// Initialize the JavaScript <-> Go RPC bridge
+	bridge := newBridge(c.client, c.prompter, c.printer)
+	c.jsre.Set("jeth", struct{}{})
+
+	jethObj, _ := c.jsre.Get("jeth")
+	jethObj.Object().Set("send", bridge.Send)
+	jethObj.Object().Set("sendAsync", bridge.Send)
+
+	consoleObj, _ := c.jsre.Get("console")
+	consoleObj.Object().Set("log", c.consoleOutput)
+	consoleObj.Object().Set("error", c.consoleOutput)
+
+	// Load all the internal utility JavaScript libraries
+	if err := c.jsre.Compile("bignumber.js", jsre.BigNumber_JS); err != nil {
+		return fmt.Errorf("bignumber.js: %v", err)
+	}
+	if err := c.jsre.Compile("web3.js", jsre.Web3_JS); err != nil {
+		return fmt.Errorf("web3.js: %v", err)
+	}
+	if _, err := c.jsre.Run("var Web3 = require('web3');"); err != nil {
+		return fmt.Errorf("web3 require: %v", err)
+	}
+	if _, err := c.jsre.Run("var web3 = new Web3(jeth);"); err != nil {
+		return fmt.Errorf("web3 provider: %v", err)
+	}
+	// Load the supported APIs into the JavaScript runtime environment
+	apis, err := c.client.SupportedModules()
+	if err != nil {
+		return fmt.Errorf("api modules: %v", err)
+	}
+	flatten := "var eth = web3.eth; var personal = web3.personal; "
+	for api := range apis {
+		if api == "web3" {
+			continue // manually mapped or ignore
+		}
+		if file, ok := web3ext.Modules[api]; ok {
+			if err = c.jsre.Compile(fmt.Sprintf("%s.js", api), file); err != nil {
+				return fmt.Errorf("%s.js: %v", api, err)
+			}
+			flatten += fmt.Sprintf("var %s = web3.%s; ", api, api)
+		}
+	}
+	if _, err = c.jsre.Run(flatten); err != nil {
+		return fmt.Errorf("namespace flattening: %v", err)
+	}
+	// Initialize the global name register (disabled for now)
+	//c.jsre.Run(`var GlobalRegistrar = eth.contract(` + registrar.GlobalRegistrarAbi + `);   registrar = GlobalRegistrar.at("` + registrar.GlobalRegistrarAddr + `");`)
+
+	// If the console is in interactive mode, instrument password related methods to query the user
+	if c.prompter != nil {
+		// Retrieve the account management object to instrument
+		personal, err := c.jsre.Get("personal")
+		if err != nil {
+			return err
+		}
+		// Override the unlockAccount and newAccount methods since these require user interaction.
+		// Assign the jeth.unlockAccount and jeth.newAccount in the Console the original web3 callbacks.
+		// These will be called by the jeth.* methods after they got the password from the user and send
+		// the original web3 request to the backend.
+		if obj := personal.Object(); obj != nil { // make sure the personal api is enabled over the interface
+			if _, err = c.jsre.Run(`jeth.unlockAccount = personal.unlockAccount;`); err != nil {
+				return fmt.Errorf("personal.unlockAccount: %v", err)
+			}
+			if _, err = c.jsre.Run(`jeth.newAccount = personal.newAccount;`); err != nil {
+				return fmt.Errorf("personal.newAccount: %v", err)
+			}
+			obj.Set("unlockAccount", bridge.UnlockAccount)
+			obj.Set("newAccount", bridge.NewAccount)
+		}
+	}
+	// The admin.sleep and admin.sleepBlocks are offered by the console and not by the RPC layer.
+	admin, err := c.jsre.Get("admin")
+	if err != nil {
+		return err
+	}
+	if obj := admin.Object(); obj != nil { // make sure the admin api is enabled over the interface
+		obj.Set("sleepBlocks", bridge.SleepBlocks)
+		obj.Set("sleep", bridge.Sleep)
+	}
+	// Preload any JavaScript files before starting the console
+	for _, path := range preload {
+		if err := c.jsre.Exec(path); err != nil {
+			failure := err.Error()
+			if ottoErr, ok := err.(*otto.Error); ok {
+				failure = ottoErr.String()
+			}
+			return fmt.Errorf("%s: %v", path, failure)
+		}
+	}
+	// Configure the console's input prompter for scrollback and tab completion
+	if c.prompter != nil {
+		if content, err := ioutil.ReadFile(c.histPath); err != nil {
+			c.prompter.SetHistory(nil)
+		} else {
+			c.history = strings.Split(string(content), "\n")
+			c.prompter.SetHistory(c.history)
+		}
+		c.prompter.SetWordCompleter(c.AutoCompleteInput)
+	}
+	return nil
+}
+
+// consoleOutput is an override for the console.log and console.error methods to
+// stream the output into the configured output stream instead of stdout.
+func (c *Console) consoleOutput(call otto.FunctionCall) otto.Value {
+	output := []string{}
+	for _, argument := range call.ArgumentList {
+		output = append(output, fmt.Sprintf("%v", argument))
+	}
+	fmt.Fprintln(c.printer, strings.Join(output, " "))
+	return otto.Value{}
+}
+
+// AutoCompleteInput is a pre-assembled word completer to be used by the user
+// input prompter to provide hints to the user about the methods available.
+func (c *Console) AutoCompleteInput(line string, pos int) (string, []string, string) {
+	// No completions can be provided for empty inputs
+	if len(line) == 0 || pos == 0 {
+		return "", nil, ""
+	}
+	// Chunck data to relevant part for autocompletion
+	// E.g. in case of nested lines eth.getBalance(eth.coinb<tab><tab>
+	start := 0
+	for start = pos - 1; start > 0; start-- {
+		// Skip all methods and namespaces (i.e. including te dot)
+		if line[start] == '.' || (line[start] >= 'a' && line[start] <= 'z') || (line[start] >= 'A' && line[start] <= 'Z') {
+			continue
+		}
+		// Handle web3 in a special way (i.e. other numbers aren't auto completed)
+		if start >= 3 && line[start-3:start] == "web3" {
+			start -= 3
+			continue
+		}
+		// We've hit an unexpected character, autocomplete form here
+		start++
+		break
+	}
+	return line[:start], c.jsre.CompleteKeywords(line[start:pos]), line[pos:]
+}
+
+// Welcome show summary of current Geth instance and some metadata about the
+// console's available modules.
+func (c *Console) Welcome() {
+	// Print some generic Geth metadata
+	c.jsre.Run(`
+    (function () {
+			console.log("Welcome to the Geth JavaScript console!\n");
+      console.log("instance: " + web3.version.node);
+      console.log("coinbase: " + eth.coinbase);
+      console.log("at block: " + eth.blockNumber + " (" + new Date(1000 * eth.getBlock(eth.blockNumber).timestamp) + ")");
+      console.log(" datadir: " + admin.datadir);
+    })();
+  `)
+	// List all the supported modules for the user to call
+	if apis, err := c.client.SupportedModules(); err == nil {
+		modules := make([]string, 0, len(apis))
+		for api, version := range apis {
+			modules = append(modules, fmt.Sprintf("%s:%s", api, version))
+		}
+		sort.Strings(modules)
+		c.jsre.Run("(function () { console.log(' modules: " + strings.Join(modules, " ") + "'); })();")
+	}
+	c.jsre.Run("(function () { console.log(); })();")
+}
+
+// Evaluate executes code and pretty prints the result to the specified output
+// stream.
+func (c *Console) Evaluate(statement string) error {
+	defer func() {
+		if r := recover(); r != nil {
+			fmt.Fprintf(c.printer, "[native] error: %v\n", r)
+		}
+	}()
+	if err := c.jsre.Evaluate(statement, c.printer); err != nil {
+		return err
+	}
+	return nil
+}
+
+// Interactive starts an interactive user session, where input is propted from
+// the configured user prompter.
+func (c *Console) Interactive() {
+	var (
+		prompt    = c.prompt          // Current prompt line (used for multi-line inputs)
+		indents   = 0                 // Current number of input indents (used for multi-line inputs)
+		input     = ""                // Current user input
+		scheduler = make(chan string) // Channel to send the next prompt on and receive the input
+	)
+	// Start a goroutine to listen for promt requests and send back inputs
+	go func() {
+		for {
+			// Read the next user input
+			line, err := c.prompter.PromptInput(<-scheduler)
+			if err != nil {
+				// In case of an error, either clear the prompt or fail
+				if err == liner.ErrPromptAborted { // ctrl-C
+					prompt, indents, input = c.prompt, 0, ""
+					scheduler <- ""
+					continue
+				}
+				close(scheduler)
+				return
+			}
+			// User input retrieved, send for interpretation and loop
+			scheduler <- line
+		}
+	}()
+	// Monitor Ctrl-C too in case the input is empty and we need to bail
+	abort := make(chan os.Signal, 1)
+	signal.Notify(abort, os.Interrupt)
+
+	// Start sending prompts to the user and reading back inputs
+	for {
+		// Send the next prompt, triggering an input read and process the result
+		scheduler <- prompt
+		select {
+		case <-abort:
+			// User forcefully quite the console
+			fmt.Fprintln(c.printer, "caught interrupt, exiting")
+			return
+
+		case line, ok := <-scheduler:
+			// User input was returned by the prompter, handle special cases
+			if !ok || (indents <= 0 && exit.MatchString(line)) {
+				return
+			}
+			if onlyWhitespace.MatchString(line) {
+				continue
+			}
+			// Append the line to the input and check for multi-line interpretation
+			input += line + "\n"
+
+			indents = strings.Count(input, "{") + strings.Count(input, "(") - strings.Count(input, "}") - strings.Count(input, ")")
+			if indents <= 0 {
+				prompt = c.prompt
+			} else {
+				prompt = strings.Repeat("..", indents*2) + " "
+			}
+			// If all the needed lines are present, save the command and run
+			if indents <= 0 {
+				if len(input) > 0 && input[0] != ' ' && !passwordRegexp.MatchString(input) {
+					if command := strings.TrimSpace(input); len(c.history) == 0 || command != c.history[len(c.history)-1] {
+						c.history = append(c.history, command)
+						if c.prompter != nil {
+							c.prompter.AppendHistory(command)
+						}
+					}
+				}
+				c.Evaluate(input)
+				input = ""
+			}
+		}
+	}
+}
+
+// Execute runs the JavaScript file specified as the argument.
+func (c *Console) Execute(path string) error {
+	return c.jsre.Exec(path)
+}
+
+// Stop cleans up the console and terminates the runtime envorinment.
+func (c *Console) Stop(graceful bool) error {
+	if err := ioutil.WriteFile(c.histPath, []byte(strings.Join(c.history, "\n")), 0600); err != nil {
+		return err
+	}
+	if err := os.Chmod(c.histPath, 0600); err != nil { // Force 0600, even if it was different previously
+		return err
+	}
+	c.jsre.Stop(graceful)
+	return nil
+}
diff --git a/console/console_test.go b/console/console_test.go
new file mode 100644
index 000000000..911087824
--- /dev/null
+++ b/console/console_test.go
@@ -0,0 +1,296 @@
+// Copyright 2015 The go-ethereum Authors
+// This file is part of the go-ethereum library.
+//
+// The go-ethereum library is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// The go-ethereum 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 Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
+
+package console
+
+import (
+	"bytes"
+	"errors"
+	"fmt"
+	"io/ioutil"
+	"math/big"
+	"os"
+	"path/filepath"
+	"strings"
+	"testing"
+	"time"
+
+	"github.com/ethereum/go-ethereum/accounts"
+	"github.com/ethereum/go-ethereum/common"
+	"github.com/ethereum/go-ethereum/core"
+	"github.com/ethereum/go-ethereum/eth"
+	"github.com/ethereum/go-ethereum/internal/jsre"
+	"github.com/ethereum/go-ethereum/node"
+)
+
+const (
+	testInstance = "console-tester"
+	testAddress  = "0x8605cdbbdb6d264aa742e77020dcbc58fcdce182"
+)
+
+// hookedPrompter implements UserPrompter to simulate use input via channels.
+type hookedPrompter struct {
+	scheduler chan string
+}
+
+func (p *hookedPrompter) PromptInput(prompt string) (string, error) {
+	// Send the prompt to the tester
+	select {
+	case p.scheduler <- prompt:
+	case <-time.After(time.Second):
+		return "", errors.New("prompt timeout")
+	}
+	// Retrieve the response and feed to the console
+	select {
+	case input := <-p.scheduler:
+		return input, nil
+	case <-time.After(time.Second):
+		return "", errors.New("input timeout")
+	}
+}
+
+func (p *hookedPrompter) PromptPassword(prompt string) (string, error) {
+	return "", errors.New("not implemented")
+}
+func (p *hookedPrompter) PromptConfirm(prompt string) (bool, error) {
+	return false, errors.New("not implemented")
+}
+func (p *hookedPrompter) SetHistory(history []string)              {}
+func (p *hookedPrompter) AppendHistory(command string)             {}
+func (p *hookedPrompter) SetWordCompleter(completer WordCompleter) {}
+
+// tester is a console test environment for the console tests to operate on.
+type tester struct {
+	workspace string
+	stack     *node.Node
+	ethereum  *eth.Ethereum
+	console   *Console
+	input     *hookedPrompter
+	output    *bytes.Buffer
+
+	lastConfirm string
+}
+
+// newTester creates a test environment based on which the console can operate.
+// Please ensure you call Close() on the returned tester to avoid leaks.
+func newTester(t *testing.T, confOverride func(*eth.Config)) *tester {
+	// Create a temporary storage for the node keys and initialize it
+	workspace, err := ioutil.TempDir("", "console-tester-")
+	if err != nil {
+		t.Fatalf("failed to create temporary keystore: %v", err)
+	}
+	accman := accounts.NewPlaintextManager(filepath.Join(workspace, "keystore"))
+
+	// Create a networkless protocol stack and start an Ethereum service within
+	stack, err := node.New(&node.Config{DataDir: workspace, Name: testInstance, NoDiscovery: true})
+	if err != nil {
+		t.Fatalf("failed to create node: %v", err)
+	}
+	ethConf := &eth.Config{
+		ChainConfig:    &core.ChainConfig{HomesteadBlock: new(big.Int)},
+		Etherbase:      common.HexToAddress(testAddress),
+		AccountManager: accman,
+		PowTest:        true,
+	}
+	if confOverride != nil {
+		confOverride(ethConf)
+	}
+	if err = stack.Register(func(ctx *node.ServiceContext) (node.Service, error) { return eth.New(ctx, ethConf) }); err != nil {
+		t.Fatalf("failed to register Ethereum protocol: %v", err)
+	}
+	// Start the node and assemble the JavaScript console around it
+	if err = stack.Start(); err != nil {
+		t.Fatalf("failed to start test stack: %v", err)
+	}
+	client, err := stack.Attach()
+	if err != nil {
+		t.Fatalf("failed to attach to node: %v", err)
+	}
+	prompter := &hookedPrompter{scheduler: make(chan string)}
+	printer := new(bytes.Buffer)
+
+	console, err := New(Config{
+		DataDir:  stack.DataDir(),
+		DocRoot:  "testdata",
+		Client:   client,
+		Prompter: prompter,
+		Printer:  printer,
+		Preload:  []string{"preload.js"},
+	})
+	if err != nil {
+		t.Fatalf("failed to create JavaScript console: %v", err)
+	}
+	// Create the final tester and return
+	var ethereum *eth.Ethereum
+	stack.Service(&ethereum)
+
+	return &tester{
+		workspace: workspace,
+		stack:     stack,
+		ethereum:  ethereum,
+		console:   console,
+		input:     prompter,
+		output:    printer,
+	}
+}
+
+// Close cleans up any temporary data folders and held resources.
+func (env *tester) Close(t *testing.T) {
+	if err := env.console.Stop(false); err != nil {
+		t.Errorf("failed to stop embedded console: %v", err)
+	}
+	if err := env.stack.Stop(); err != nil {
+		t.Errorf("failed to stop embedded node: %v", err)
+	}
+	os.RemoveAll(env.workspace)
+}
+
+// Tests that the node lists the correct welcome message, notably that it contains
+// the instance name, coinbase account, block number, data directory and supported
+// console modules.
+func TestWelcome(t *testing.T) {
+	tester := newTester(t, nil)
+	defer tester.Close(t)
+
+	tester.console.Welcome()
+
+	output := string(tester.output.Bytes())
+	if want := "Welcome"; !strings.Contains(output, want) {
+		t.Fatalf("console output missing welcome message: have\n%s\nwant also %s", output, want)
+	}
+	if want := fmt.Sprintf("instance: %s", testInstance); !strings.Contains(output, want) {
+		t.Fatalf("console output missing instance: have\n%s\nwant also %s", output, want)
+	}
+	if want := fmt.Sprintf("coinbase: %s", testAddress); !strings.Contains(output, want) {
+		t.Fatalf("console output missing coinbase: have\n%s\nwant also %s", output, want)
+	}
+	if want := "at block: 0"; !strings.Contains(output, want) {
+		t.Fatalf("console output missing sync status: have\n%s\nwant also %s", output, want)
+	}
+	if want := fmt.Sprintf("datadir: %s", tester.workspace); !strings.Contains(output, want) {
+		t.Fatalf("console output missing coinbase: have\n%s\nwant also %s", output, want)
+	}
+}
+
+// Tests that JavaScript statement evaluation works as intended.
+func TestEvaluate(t *testing.T) {
+	tester := newTester(t, nil)
+	defer tester.Close(t)
+
+	tester.console.Evaluate("2 + 2")
+	if output := string(tester.output.Bytes()); !strings.Contains(output, "4") {
+		t.Fatalf("statement evaluation failed: have %s, want %s", output, "4")
+	}
+}
+
+// Tests that the console can be used in interactive mode.
+func TestInteractive(t *testing.T) {
+	// Create a tester and run an interactive console in the background
+	tester := newTester(t, nil)
+	defer tester.Close(t)
+
+	go tester.console.Interactive()
+
+	// Wait for a promt and send a statement back
+	select {
+	case <-tester.input.scheduler:
+	case <-time.After(time.Second):
+		t.Fatalf("initial prompt timeout")
+	}
+	select {
+	case tester.input.scheduler <- "2+2":
+	case <-time.After(time.Second):
+		t.Fatalf("input feedback timeout")
+	}
+	// Wait for the second promt and ensure first statement was evaluated
+	select {
+	case <-tester.input.scheduler:
+	case <-time.After(time.Second):
+		t.Fatalf("secondary prompt timeout")
+	}
+	if output := string(tester.output.Bytes()); !strings.Contains(output, "4") {
+		t.Fatalf("statement evaluation failed: have %s, want %s", output, "4")
+	}
+}
+
+// Tests that preloaded JavaScript files have been executed before user is given
+// input.
+func TestPreload(t *testing.T) {
+	tester := newTester(t, nil)
+	defer tester.Close(t)
+
+	tester.console.Evaluate("preloaded")
+	if output := string(tester.output.Bytes()); !strings.Contains(output, "some-preloaded-string") {
+		t.Fatalf("preloaded variable missing: have %s, want %s", output, "some-preloaded-string")
+	}
+}
+
+// Tests that JavaScript scripts can be executes from the configured asset path.
+func TestExecute(t *testing.T) {
+	tester := newTester(t, nil)
+	defer tester.Close(t)
+
+	tester.console.Execute("exec.js")
+
+	tester.console.Evaluate("execed")
+	if output := string(tester.output.Bytes()); !strings.Contains(output, "some-executed-string") {
+		t.Fatalf("execed variable missing: have %s, want %s", output, "some-executed-string")
+	}
+}
+
+// Tests that the JavaScript objects returned by statement executions are properly
+// pretty printed instead of just displaing "[object]".
+func TestPrettyPrint(t *testing.T) {
+	tester := newTester(t, nil)
+	defer tester.Close(t)
+
+	tester.console.Evaluate("obj = {int: 1, string: 'two', list: [3, 3, 3], obj: {null: null, func: function(){}}}")
+
+	// Define some specially formatted fields
+	var (
+		one   = jsre.NumberColor("1")
+		two   = jsre.StringColor("\"two\"")
+		three = jsre.NumberColor("3")
+		null  = jsre.SpecialColor("null")
+		fun   = jsre.FunctionColor("function()")
+	)
+	// Assemble the actual output we're after and verify
+	want := `{
+  int: ` + one + `,
+  list: [` + three + `, ` + three + `, ` + three + `],
+  obj: {
+    null: ` + null + `,
+    func: ` + fun + `
+  },
+  string: ` + two + `
+}
+`
+	if output := string(tester.output.Bytes()); output != want {
+		t.Fatalf("pretty print mismatch: have %s, want %s", output, want)
+	}
+}
+
+// Tests that the JavaScript exceptions are properly formatted and colored.
+func TestPrettyError(t *testing.T) {
+	tester := newTester(t, nil)
+	defer tester.Close(t)
+	tester.console.Evaluate("throw 'hello'")
+
+	want := jsre.ErrorColor("hello") + "\n"
+	if output := string(tester.output.Bytes()); output != want {
+		t.Fatalf("pretty error mismatch: have %s, want %s", output, want)
+	}
+}
diff --git a/console/prompter.go b/console/prompter.go
new file mode 100644
index 000000000..0e4a8a53e
--- /dev/null
+++ b/console/prompter.go
@@ -0,0 +1,165 @@
+// Copyright 2016 The go-ethereum Authors
+// This file is part of the go-ethereum library.
+//
+// The go-ethereum library is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// The go-ethereum 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 Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
+
+package console
+
+import (
+	"fmt"
+	"strings"
+
+	"github.com/peterh/liner"
+)
+
+// Stdin holds the stdin line reader (also using stdout for printing prompts).
+// Only this reader may be used for input because it keeps an internal buffer.
+var Stdin = newTerminalPrompter()
+
+// UserPrompter defines the methods needed by the console to promt the user for
+// various types of inputs.
+type UserPrompter interface {
+	// PromptInput displays the given prompt to the user and requests some textual
+	// data to be entered, returning the input of the user.
+	PromptInput(prompt string) (string, error)
+
+	// PromptPassword displays the given prompt to the user and requests some textual
+	// data to be entered, but one which must not be echoed out into the terminal.
+	// The method returns the input provided by the user.
+	PromptPassword(prompt string) (string, error)
+
+	// PromptConfirm displays the given prompt to the user and requests a boolean
+	// choice to be made, returning that choice.
+	PromptConfirm(prompt string) (bool, error)
+
+	// SetHistory sets the the input scrollback history that the prompter will allow
+	// the user to scoll back to.
+	SetHistory(history []string)
+
+	// AppendHistory appends an entry to the scrollback history. It should be called
+	// if and only if the prompt to append was a valid command.
+	AppendHistory(command string)
+
+	// SetWordCompleter sets the completion function that the prompter will call to
+	// fetch completion candidates when the user presses tab.
+	SetWordCompleter(completer WordCompleter)
+}
+
+// WordCompleter takes the currently edited line with the cursor position and
+// returns the completion candidates for the partial word to be completed. If
+// the line is "Hello, wo!!!" and the cursor is before the first '!', ("Hello,
+// wo!!!", 9) is passed to the completer which may returns ("Hello, ", {"world",
+// "Word"}, "!!!") to have "Hello, world!!!".
+type WordCompleter func(line string, pos int) (string, []string, string)
+
+// terminalPrompter is a UserPrompter backed by the liner package. It supports
+// prompting the user for various input, among others for non-echoing password
+// input.
+type terminalPrompter struct {
+	*liner.State
+	warned     bool
+	supported  bool
+	normalMode liner.ModeApplier
+	rawMode    liner.ModeApplier
+}
+
+// newTerminalPrompter creates a liner based user input prompter working off the
+// standard input and output streams.
+func newTerminalPrompter() *terminalPrompter {
+	p := new(terminalPrompter)
+	// Get the original mode before calling NewLiner.
+	// This is usually regular "cooked" mode where characters echo.
+	normalMode, _ := liner.TerminalMode()
+	// Turn on liner. It switches to raw mode.
+	p.State = liner.NewLiner()
+	rawMode, err := liner.TerminalMode()
+	if err != nil || !liner.TerminalSupported() {
+		p.supported = false
+	} else {
+		p.supported = true
+		p.normalMode = normalMode
+		p.rawMode = rawMode
+		// Switch back to normal mode while we're not prompting.
+		normalMode.ApplyMode()
+	}
+	p.SetCtrlCAborts(true)
+	p.SetTabCompletionStyle(liner.TabPrints)
+
+	return p
+}
+
+// PromptInput displays the given prompt to the user and requests some textual
+// data to be entered, returning the input of the user.
+func (p *terminalPrompter) PromptInput(prompt string) (string, error) {
+	if p.supported {
+		p.rawMode.ApplyMode()
+		defer p.normalMode.ApplyMode()
+	} else {
+		// liner tries to be smart about printing the prompt
+		// and doesn't print anything if input is redirected.
+		// Un-smart it by printing the prompt always.
+		fmt.Print(prompt)
+		prompt = ""
+		defer fmt.Println()
+	}
+	return p.State.Prompt(prompt)
+}
+
+// PromptPassword displays the given prompt to the user and requests some textual
+// data to be entered, but one which must not be echoed out into the terminal.
+// The method returns the input provided by the user.
+func (p *terminalPrompter) PromptPassword(prompt string) (passwd string, err error) {
+	if p.supported {
+		p.rawMode.ApplyMode()
+		defer p.normalMode.ApplyMode()
+		return p.State.PasswordPrompt(prompt)
+	}
+	if !p.warned {
+		fmt.Println("!! Unsupported terminal, password will be echoed.")
+		p.warned = true
+	}
+	// Just as in Prompt, handle printing the prompt here instead of relying on liner.
+	fmt.Print(prompt)
+	passwd, err = p.State.Prompt("")
+	fmt.Println()
+	return passwd, err
+}
+
+// PromptConfirm displays the given prompt to the user and requests a boolean
+// choice to be made, returning that choice.
+func (p *terminalPrompter) PromptConfirm(prompt string) (bool, error) {
+	input, err := p.Prompt(prompt + " [y/N] ")
+	if len(input) > 0 && strings.ToUpper(input[:1]) == "Y" {
+		return true, nil
+	}
+	return false, err
+}
+
+// SetHistory sets the the input scrollback history that the prompter will allow
+// the user to scoll back to.
+func (p *terminalPrompter) SetHistory(history []string) {
+	p.State.ReadHistory(strings.NewReader(strings.Join(history, "\n")))
+}
+
+// AppendHistory appends an entry to the scrollback history. It should be called
+// if and only if the prompt to append was a valid command.
+func (p *terminalPrompter) AppendHistory(command string) {
+	p.State.AppendHistory(command)
+}
+
+// SetWordCompleter sets the completion function that the prompter will call to
+// fetch completion candidates when the user presses tab.
+func (p *terminalPrompter) SetWordCompleter(completer WordCompleter) {
+	p.State.SetWordCompleter(liner.WordCompleter(completer))
+}
diff --git a/console/testdata/exec.js b/console/testdata/exec.js
new file mode 100644
index 000000000..59e34d7c4
--- /dev/null
+++ b/console/testdata/exec.js
@@ -0,0 +1 @@
+var execed = "some-executed-string";
diff --git a/console/testdata/preload.js b/console/testdata/preload.js
new file mode 100644
index 000000000..556793970
--- /dev/null
+++ b/console/testdata/preload.js
@@ -0,0 +1 @@
+var preloaded = "some-preloaded-string";
diff --git a/jsre/bignumber_js.go b/internal/jsre/bignumber_js.go
index 2e9c74c9f..2e9c74c9f 100644
--- a/jsre/bignumber_js.go
+++ b/internal/jsre/bignumber_js.go
diff --git a/jsre/completion.go b/internal/jsre/completion.go
index 7f484bbbb..7f484bbbb 100644
--- a/jsre/completion.go
+++ b/internal/jsre/completion.go
diff --git a/jsre/completion_test.go b/internal/jsre/completion_test.go
index 92af5ddb6..ccbd73dcc 100644
--- a/jsre/completion_test.go
+++ b/internal/jsre/completion_test.go
@@ -17,12 +17,13 @@
 package jsre
 
 import (
+	"os"
 	"reflect"
 	"testing"
 )
 
 func TestCompleteKeywords(t *testing.T) {
-	re := New("")
+	re := New("", os.Stdout)
 	re.Run(`
 		function theClass() {
 			this.foo = 3;
diff --git a/jsre/ethereum_js.go b/internal/jsre/ethereum_js.go
index 79ce1d2e2..79ce1d2e2 100644
--- a/jsre/ethereum_js.go
+++ b/internal/jsre/ethereum_js.go
diff --git a/jsre/jsre.go b/internal/jsre/jsre.go
index 59730bc0d..a95efd379 100644
--- a/jsre/jsre.go
+++ b/internal/jsre/jsre.go
@@ -21,6 +21,7 @@ import (
 	crand "crypto/rand"
 	"encoding/binary"
 	"fmt"
+	"io"
 	"io/ioutil"
 	"math/rand"
 	"sync"
@@ -40,6 +41,7 @@ It provides some helper functions to
 */
 type JSRE struct {
 	assetPath     string
+	output        io.Writer
 	evalQueue     chan *evalReq
 	stopEventLoop chan bool
 	loopWg        sync.WaitGroup
@@ -60,9 +62,10 @@ type evalReq struct {
 }
 
 // runtime must be stopped with Stop() after use and cannot be used after stopping
-func New(assetPath string) *JSRE {
+func New(assetPath string, output io.Writer) *JSRE {
 	re := &JSRE{
 		assetPath:     assetPath,
+		output:        output,
 		evalQueue:     make(chan *evalReq),
 		stopEventLoop: make(chan bool),
 	}
@@ -292,19 +295,21 @@ func (self *JSRE) loadScript(call otto.FunctionCall) otto.Value {
 	return otto.TrueValue()
 }
 
-// EvalAndPrettyPrint evaluates code and pretty prints the result to
-// standard output.
-func (self *JSRE) EvalAndPrettyPrint(code string) (err error) {
+// Evaluate executes code and pretty prints the result to the specified output
+// stream.
+func (self *JSRE) Evaluate(code string, w io.Writer) error {
+	var fail error
+
 	self.Do(func(vm *otto.Otto) {
-		var val otto.Value
-		val, err = vm.Run(code)
+		val, err := vm.Run(code)
 		if err != nil {
-			return
+			prettyError(vm, err, w)
+		} else {
+			prettyPrint(vm, val, w)
 		}
-		prettyPrint(vm, val)
-		fmt.Println()
+		fmt.Fprintln(w)
 	})
-	return err
+	return fail
 }
 
 // Compile compiles and then runs a piece of JS code.
diff --git a/jsre/jsre_test.go b/internal/jsre/jsre_test.go
index ffb6999db..bcb6e0dd2 100644
--- a/jsre/jsre_test.go
+++ b/internal/jsre/jsre_test.go
@@ -51,7 +51,7 @@ func newWithTestJS(t *testing.T, testjs string) (*JSRE, string) {
 			t.Fatal("cannot create test.js:", err)
 		}
 	}
-	return New(dir), dir
+	return New(dir, os.Stdout), dir
 }
 
 func TestExec(t *testing.T) {
@@ -102,7 +102,7 @@ func TestNatto(t *testing.T) {
 }
 
 func TestBind(t *testing.T) {
-	jsre := New("")
+	jsre := New("", os.Stdout)
 	defer jsre.Stop(false)
 
 	jsre.Bind("no", &testNativeObjectBinding{})
diff --git a/jsre/pretty.go b/internal/jsre/pretty.go
index cd7fa5232..30d8660ff 100644
--- a/jsre/pretty.go
+++ b/internal/jsre/pretty.go
@@ -18,6 +18,7 @@ package jsre
 
 import (
 	"fmt"
+	"io"
 	"sort"
 	"strconv"
 	"strings"
@@ -32,10 +33,11 @@ const (
 )
 
 var (
-	functionColor = color.New(color.FgMagenta)
-	specialColor  = color.New(color.Bold)
-	numberColor   = color.New(color.FgRed)
-	stringColor   = color.New(color.FgGreen)
+	FunctionColor = color.New(color.FgMagenta).SprintfFunc()
+	SpecialColor  = color.New(color.Bold).SprintfFunc()
+	NumberColor   = color.New(color.FgRed).SprintfFunc()
+	StringColor   = color.New(color.FgGreen).SprintfFunc()
+	ErrorColor    = color.New(color.FgHiRed).SprintfFunc()
 )
 
 // these fields are hidden when printing objects.
@@ -50,19 +52,39 @@ var boringKeys = map[string]bool{
 }
 
 // prettyPrint writes value to standard output.
-func prettyPrint(vm *otto.Otto, value otto.Value) {
-	ppctx{vm}.printValue(value, 0, false)
+func prettyPrint(vm *otto.Otto, value otto.Value, w io.Writer) {
+	ppctx{vm: vm, w: w}.printValue(value, 0, false)
 }
 
-func prettyPrintJS(call otto.FunctionCall) otto.Value {
+// prettyError writes err to standard output.
+func prettyError(vm *otto.Otto, err error, w io.Writer) {
+	failure := err.Error()
+	if ottoErr, ok := err.(*otto.Error); ok {
+		failure = ottoErr.String()
+	}
+	fmt.Fprint(w, ErrorColor("%s", failure))
+}
+
+// jsErrorString adds a backtrace to errors generated by otto.
+func jsErrorString(err error) string {
+	if ottoErr, ok := err.(*otto.Error); ok {
+		return ottoErr.String()
+	}
+	return err.Error()
+}
+
+func prettyPrintJS(call otto.FunctionCall, w io.Writer) otto.Value {
 	for _, v := range call.ArgumentList {
-		prettyPrint(call.Otto, v)
-		fmt.Println()
+		prettyPrint(call.Otto, v, w)
+		fmt.Fprintln(w)
 	}
 	return otto.UndefinedValue()
 }
 
-type ppctx struct{ vm *otto.Otto }
+type ppctx struct {
+	vm *otto.Otto
+	w  io.Writer
+}
 
 func (ctx ppctx) indent(level int) string {
 	return strings.Repeat(indentString, level)
@@ -73,22 +95,22 @@ func (ctx ppctx) printValue(v otto.Value, level int, inArray bool) {
 	case v.IsObject():
 		ctx.printObject(v.Object(), level, inArray)
 	case v.IsNull():
-		specialColor.Print("null")
+		fmt.Fprint(ctx.w, SpecialColor("null"))
 	case v.IsUndefined():
-		specialColor.Print("undefined")
+		fmt.Fprint(ctx.w, SpecialColor("undefined"))
 	case v.IsString():
 		s, _ := v.ToString()
-		stringColor.Printf("%q", s)
+		fmt.Fprint(ctx.w, StringColor("%q", s))
 	case v.IsBoolean():
 		b, _ := v.ToBoolean()
-		specialColor.Printf("%t", b)
+		fmt.Fprint(ctx.w, SpecialColor("%t", b))
 	case v.IsNaN():
-		numberColor.Printf("NaN")
+		fmt.Fprint(ctx.w, NumberColor("NaN"))
 	case v.IsNumber():
 		s, _ := v.ToString()
-		numberColor.Printf("%s", s)
+		fmt.Fprint(ctx.w, NumberColor("%s", s))
 	default:
-		fmt.Printf("<unprintable>")
+		fmt.Fprint(ctx.w, "<unprintable>")
 	}
 }
 
@@ -98,75 +120,75 @@ func (ctx ppctx) printObject(obj *otto.Object, level int, inArray bool) {
 		lv, _ := obj.Get("length")
 		len, _ := lv.ToInteger()
 		if len == 0 {
-			fmt.Printf("[]")
+			fmt.Fprintf(ctx.w, "[]")
 			return
 		}
 		if level > maxPrettyPrintLevel {
-			fmt.Print("[...]")
+			fmt.Fprint(ctx.w, "[...]")
 			return
 		}
-		fmt.Print("[")
+		fmt.Fprint(ctx.w, "[")
 		for i := int64(0); i < len; i++ {
 			el, err := obj.Get(strconv.FormatInt(i, 10))
 			if err == nil {
 				ctx.printValue(el, level+1, true)
 			}
 			if i < len-1 {
-				fmt.Printf(", ")
+				fmt.Fprintf(ctx.w, ", ")
 			}
 		}
-		fmt.Print("]")
+		fmt.Fprint(ctx.w, "]")
 
 	case "Object":
 		// Print values from bignumber.js as regular numbers.
 		if ctx.isBigNumber(obj) {
-			numberColor.Print(toString(obj))
+			fmt.Fprint(ctx.w, NumberColor("%s", toString(obj)))
 			return
 		}
 		// Otherwise, print all fields indented, but stop if we're too deep.
 		keys := ctx.fields(obj)
 		if len(keys) == 0 {
-			fmt.Print("{}")
+			fmt.Fprint(ctx.w, "{}")
 			return
 		}
 		if level > maxPrettyPrintLevel {
-			fmt.Print("{...}")
+			fmt.Fprint(ctx.w, "{...}")
 			return
 		}
-		fmt.Println("{")
+		fmt.Fprintln(ctx.w, "{")
 		for i, k := range keys {
 			v, _ := obj.Get(k)
-			fmt.Printf("%s%s: ", ctx.indent(level+1), k)
+			fmt.Fprintf(ctx.w, "%s%s: ", ctx.indent(level+1), k)
 			ctx.printValue(v, level+1, false)
 			if i < len(keys)-1 {
-				fmt.Printf(",")
+				fmt.Fprintf(ctx.w, ",")
 			}
-			fmt.Println()
+			fmt.Fprintln(ctx.w)
 		}
 		if inArray {
 			level--
 		}
-		fmt.Printf("%s}", ctx.indent(level))
+		fmt.Fprintf(ctx.w, "%s}", ctx.indent(level))
 
 	case "Function":
 		// Use toString() to display the argument list if possible.
 		if robj, err := obj.Call("toString"); err != nil {
-			functionColor.Print("function()")
+			fmt.Fprint(ctx.w, FunctionColor("function()"))
 		} else {
 			desc := strings.Trim(strings.Split(robj.String(), "{")[0], " \t\n")
 			desc = strings.Replace(desc, " (", "(", 1)
-			functionColor.Print(desc)
+			fmt.Fprint(ctx.w, FunctionColor("%s", desc))
 		}
 
 	case "RegExp":
-		stringColor.Print(toString(obj))
+		fmt.Fprint(ctx.w, StringColor("%s", toString(obj)))
 
 	default:
 		if v, _ := obj.Get("toString"); v.IsFunction() && level <= maxPrettyPrintLevel {
 			s, _ := obj.Call("toString")
-			fmt.Printf("<%s %s>", obj.Class(), s.String())
+			fmt.Fprintf(ctx.w, "<%s %s>", obj.Class(), s.String())
 		} else {
-			fmt.Printf("<%s>", obj.Class())
+			fmt.Fprintf(ctx.w, "<%s>", obj.Class())
 		}
 	}
 }
diff --git a/rpc/json.go b/rpc/json.go
index 8a3bea2ee..151ed546e 100644
--- a/rpc/json.go
+++ b/rpc/json.go
@@ -30,7 +30,7 @@ import (
 )
 
 const (
-	jsonRPCVersion         = "2.0"
+	JSONRPCVersion         = "2.0"
 	serviceMethodSeparator = "_"
 	subscribeMethod        = "eth_subscribe"
 	unsubscribeMethod      = "eth_unsubscribe"
@@ -302,31 +302,31 @@ func parsePositionalArguments(args json.RawMessage, callbackArgs []reflect.Type)
 // CreateResponse will create a JSON-RPC success response with the given id and reply as result.
 func (c *jsonCodec) CreateResponse(id interface{}, reply interface{}) interface{} {
 	if isHexNum(reflect.TypeOf(reply)) {
-		return &JSONSuccessResponse{Version: jsonRPCVersion, Id: id, Result: fmt.Sprintf(`%#x`, reply)}
+		return &JSONSuccessResponse{Version: JSONRPCVersion, Id: id, Result: fmt.Sprintf(`%#x`, reply)}
 	}
-	return &JSONSuccessResponse{Version: jsonRPCVersion, Id: id, Result: reply}
+	return &JSONSuccessResponse{Version: JSONRPCVersion, Id: id, Result: reply}
 }
 
 // CreateErrorResponse will create a JSON-RPC error response with the given id and error.
 func (c *jsonCodec) CreateErrorResponse(id interface{}, err RPCError) interface{} {
-	return &JSONErrResponse{Version: jsonRPCVersion, Id: id, Error: JSONError{Code: err.Code(), Message: err.Error()}}
+	return &JSONErrResponse{Version: JSONRPCVersion, Id: id, Error: JSONError{Code: err.Code(), Message: err.Error()}}
 }
 
 // CreateErrorResponseWithInfo will create a JSON-RPC error response with the given id and error.
 // info is optional and contains additional information about the error. When an empty string is passed it is ignored.
 func (c *jsonCodec) CreateErrorResponseWithInfo(id interface{}, err RPCError, info interface{}) interface{} {
-	return &JSONErrResponse{Version: jsonRPCVersion, Id: id,
+	return &JSONErrResponse{Version: JSONRPCVersion, Id: id,
 		Error: JSONError{Code: err.Code(), Message: err.Error(), Data: info}}
 }
 
 // CreateNotification will create a JSON-RPC notification with the given subscription id and event as params.
 func (c *jsonCodec) CreateNotification(subid string, event interface{}) interface{} {
 	if isHexNum(reflect.TypeOf(event)) {
-		return &jsonNotification{Version: jsonRPCVersion, Method: notificationMethod,
+		return &jsonNotification{Version: JSONRPCVersion, Method: notificationMethod,
 			Params: jsonSubscription{Subscription: subid, Result: fmt.Sprintf(`%#x`, event)}}
 	}
 
-	return &jsonNotification{Version: jsonRPCVersion, Method: notificationMethod,
+	return &jsonNotification{Version: JSONRPCVersion, Method: notificationMethod,
 		Params: jsonSubscription{Subscription: subid, Result: event}}
 }