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cmd/ethereum: new JS repl with cross-platform line editing

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This commit is contained in:
Felix Lange 2015-03-06 03:38:19 +01:00
parent bae7e93a9c
commit 38f6d60e6e
7 changed files with 209 additions and 538 deletions
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207
cmd/ethereum/js.go
View File

@ -18,13 +18,21 @@
package main
import (
"fmt"
"io/ioutil"
"os"
"path"
"strings"
"github.com/ethereum/go-ethereum/cmd/utils"
"github.com/ethereum/go-ethereum/core/types"
"github.com/ethereum/go-ethereum/eth"
"github.com/ethereum/go-ethereum/ethutil"
"github.com/ethereum/go-ethereum/javascript"
"github.com/ethereum/go-ethereum/state"
"github.com/ethereum/go-ethereum/xeth"
"github.com/obscuren/otto"
"github.com/peterh/liner"
)
func execJsFile(ethereum *eth.Ethereum, filename string) {
@ -41,3 +49,202 @@ func execJsFile(ethereum *eth.Ethereum, filename string) {
utils.Fatalf("Javascript Error: %v", err)
}
}
type repl struct {
re *javascript.JSRE
ethereum *eth.Ethereum
xeth *xeth.XEth
prompt string
histfile *os.File
lr *liner.State
running bool
}
func newREPL(ethereum *eth.Ethereum) *repl {
hist, err := os.OpenFile(path.Join(ethereum.DataDir, "history"), os.O_RDWR|os.O_CREATE, os.ModePerm)
if err != nil {
panic(err)
}
xeth := xeth.New(ethereum)
repl := &repl{
re: javascript.NewJSRE(xeth),
xeth: xeth,
ethereum: ethereum,
prompt: "> ",
histfile: hist,
lr: liner.NewLiner(),
}
repl.initStdFuncs()
return repl
}
func (self *repl) Start() {
if !self.running {
self.running = true
self.lr.ReadHistory(self.histfile)
go self.read()
}
}
func (self *repl) Stop() {
if self.running {
self.running = false
self.histfile.Truncate(0)
self.lr.WriteHistory(self.histfile)
self.histfile.Close()
}
}
func (self *repl) parseInput(code string) {
defer func() {
if r := recover(); r != nil {
fmt.Println("[native] error", r)
}
}()
value, err := self.re.Run(code)
if err != nil {
fmt.Println(err)
return
}
self.printValue(value)
}
var indentCount = 0
var str = ""
func (self *repl) setIndent() {
open := strings.Count(str, "{")
open += strings.Count(str, "(")
closed := strings.Count(str, "}")
closed += strings.Count(str, ")")
indentCount = open - closed
if indentCount <= 0 {
self.prompt = "> "
} else {
self.prompt = strings.Join(make([]string, indentCount*2), "..")
self.prompt += " "
}
}
func (self *repl) read() {
for {
input, err := self.lr.Prompt(self.prompt)
if err != nil {
return
}
if input == "" {
continue
}
str += input + "\n"
self.setIndent()
if indentCount <= 0 {
if input == "exit" {
self.Stop()
return
}
hist := str[:len(str)-1]
self.lr.AppendHistory(hist)
self.parseInput(str)
str = ""
}
}
}
func (self *repl) printValue(v interface{}) {
method, _ := self.re.Vm.Get("prettyPrint")
v, err := self.re.Vm.ToValue(v)
if err == nil {
val, err := method.Call(method, v)
if err == nil {
fmt.Printf("%v", val)
}
}
}
func (self *repl) initStdFuncs() {
t, _ := self.re.Vm.Get("eth")
eth := t.Object()
eth.Set("connect", self.connect)
eth.Set("stopMining", self.stopMining)
eth.Set("startMining", self.startMining)
eth.Set("dump", self.dump)
eth.Set("export", self.export)
}
/*
* The following methods are natively implemented javascript functions.
*/
func (self *repl) dump(call otto.FunctionCall) otto.Value {
var block *types.Block
if len(call.ArgumentList) > 0 {
if call.Argument(0).IsNumber() {
num, _ := call.Argument(0).ToInteger()
block = self.ethereum.ChainManager().GetBlockByNumber(uint64(num))
} else if call.Argument(0).IsString() {
hash, _ := call.Argument(0).ToString()
block = self.ethereum.ChainManager().GetBlock(ethutil.Hex2Bytes(hash))
} else {
fmt.Println("invalid argument for dump. Either hex string or number")
}
if block == nil {
fmt.Println("block not found")
return otto.UndefinedValue()
}
} else {
block = self.ethereum.ChainManager().CurrentBlock()
}
statedb := state.New(block.Root(), self.ethereum.Db())
v, _ := self.re.Vm.ToValue(statedb.RawDump())
return v
}
func (self *repl) stopMining(call otto.FunctionCall) otto.Value {
self.xeth.Miner().Stop()
return otto.TrueValue()
}
func (self *repl) startMining(call otto.FunctionCall) otto.Value {
self.xeth.Miner().Start()
return otto.TrueValue()
}
func (self *repl) connect(call otto.FunctionCall) otto.Value {
nodeURL, err := call.Argument(0).ToString()
if err != nil {
return otto.FalseValue()
}
if err := self.ethereum.SuggestPeer(nodeURL); err != nil {
return otto.FalseValue()
}
return otto.TrueValue()
}
func (self *repl) export(call otto.FunctionCall) otto.Value {
if len(call.ArgumentList) == 0 {
fmt.Println("err: require file name")
return otto.FalseValue()
}
fn, err := call.Argument(0).ToString()
if err != nil {
fmt.Println(err)
return otto.FalseValue()
}
data := self.ethereum.ChainManager().Export()
if err := ethutil.WriteFile(fn, data); err != nil {
fmt.Println(err)
return otto.FalseValue()
}
return otto.TrueValue()
}

5
cmd/ethereum/main.go
View File

@ -28,7 +28,6 @@ import (
"time"
"github.com/codegangsta/cli"
"github.com/ethereum/go-ethereum/cmd/ethereum/repl"
"github.com/ethereum/go-ethereum/cmd/utils"
"github.com/ethereum/go-ethereum/core/types"
"github.com/ethereum/go-ethereum/eth"
@ -145,9 +144,9 @@ func runjs(ctx *cli.Context) {
eth := utils.GetEthereum(ClientIdentifier, Version, ctx)
startEth(ctx, eth)
if len(ctx.Args()) == 0 {
repl := ethrepl.NewJSRepl(eth)
repl.Start()
repl := newREPL(eth)
utils.RegisterInterrupt(func(os.Signal) { repl.Stop() })
repl.Start()
eth.WaitForShutdown()
} else if len(ctx.Args()) == 1 {
execJsFile(eth, ctx.Args()[0])

97
cmd/ethereum/repl/console_colors_windows.go
View File

@ -1,97 +0,0 @@
// Copyright (c) 2013-2014, Jeffrey Wilcke. All rights reserved.
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public
// License as published by the Free Software Foundation; either
// version 2.1 of the License, or (at your option) any later version.
//
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
// General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this library; if not, write to the Free Software
// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
// MA 02110-1301 USA
/* Inspired by https://github.com/xuyu/logging/blob/master/colorful_win.go */
package ethrepl
import (
"syscall"
"unsafe"
)
type color uint16
const (
green = color(0x0002)
red = color(0x0004)
yellow = color(0x000E)
)
const (
mask = uint16(yellow | green | red)
)
var (
kernel32 = syscall.NewLazyDLL("kernel32.dll")
procGetStdHandle = kernel32.NewProc("GetStdHandle")
procSetConsoleTextAttribute = kernel32.NewProc("SetConsoleTextAttribute")
procGetConsoleScreenBufferInfo = kernel32.NewProc("GetConsoleScreenBufferInfo")
hStdout uintptr
initScreenInfo *consoleScreenBufferInfo
)
func setConsoleTextAttribute(hConsoleOutput uintptr, wAttributes uint16) bool {
ret, _, _ := procSetConsoleTextAttribute.Call(hConsoleOutput, uintptr(wAttributes))
return ret != 0
}
type coord struct {
X, Y int16
}
type smallRect struct {
Left, Top, Right, Bottom int16
}
type consoleScreenBufferInfo struct {
DwSize coord
DwCursorPosition coord
WAttributes uint16
SrWindow smallRect
DwMaximumWindowSize coord
}
func getConsoleScreenBufferInfo(hConsoleOutput uintptr) *consoleScreenBufferInfo {
var csbi consoleScreenBufferInfo
ret, _, _ := procGetConsoleScreenBufferInfo.Call(hConsoleOutput, uintptr(unsafe.Pointer(&csbi)))
if ret == 0 {
return nil
}
return &csbi
}
const (
stdOutputHandle = uint32(-11 & 0xFFFFFFFF)
)
func init() {
hStdout, _, _ = procGetStdHandle.Call(uintptr(stdOutputHandle))
initScreenInfo = getConsoleScreenBufferInfo(hStdout)
}
func resetColorful() {
if initScreenInfo == nil {
return
}
setConsoleTextAttribute(hStdout, initScreenInfo.WAttributes)
}
func changeColor(c color) {
attr := uint16(0) & ^mask | uint16(c)
setConsoleTextAttribute(hStdout, attr)
}

201
cmd/ethereum/repl/repl.go
View File

@ -1,201 +0,0 @@
// Copyright (c) 2013-2014, Jeffrey Wilcke. All rights reserved.
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public
// License as published by the Free Software Foundation; either
// version 2.1 of the License, or (at your option) any later version.
//
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
// General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this library; if not, write to the Free Software
// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
// MA 02110-1301 USA
package ethrepl
import (
"bufio"
"fmt"
"io"
"os"
"path"
"github.com/ethereum/go-ethereum/core/types"
"github.com/ethereum/go-ethereum/eth"
"github.com/ethereum/go-ethereum/ethutil"
"github.com/ethereum/go-ethereum/javascript"
"github.com/ethereum/go-ethereum/logger"
"github.com/ethereum/go-ethereum/state"
"github.com/ethereum/go-ethereum/xeth"
"github.com/obscuren/otto"
)
var repllogger = logger.NewLogger("REPL")
type Repl interface {
Start()
Stop()
}
type JSRepl struct {
re *javascript.JSRE
ethereum *eth.Ethereum
xeth *xeth.XEth
prompt string
history *os.File
running bool
}
func NewJSRepl(ethereum *eth.Ethereum) *JSRepl {
hist, err := os.OpenFile(path.Join(ethereum.DataDir, "history"), os.O_RDWR|os.O_CREATE, os.ModePerm)
if err != nil {
panic(err)
}
xeth := xeth.New(ethereum)
repl := &JSRepl{re: javascript.NewJSRE(xeth), xeth: xeth, ethereum: ethereum, prompt: "> ", history: hist}
repl.initStdFuncs()
return repl
}
func (self *JSRepl) Start() {
if !self.running {
self.running = true
repllogger.Infoln("init JS Console")
reader := bufio.NewReader(self.history)
for {
line, err := reader.ReadString('\n')
if err != nil && err == io.EOF {
break
} else if err != nil {
fmt.Println("error reading history", err)
break
}
addHistory(line[:len(line)-1])
}
self.read()
}
}
func (self *JSRepl) Stop() {
if self.running {
self.running = false
repllogger.Infoln("exit JS Console")
self.history.Close()
}
}
func (self *JSRepl) parseInput(code string) {
defer func() {
if r := recover(); r != nil {
fmt.Println("[native] error", r)
}
}()
value, err := self.re.Run(code)
if err != nil {
fmt.Println(err)
return
}
self.PrintValue(value)
}
func (self *JSRepl) initStdFuncs() {
t, _ := self.re.Vm.Get("eth")
eth := t.Object()
eth.Set("connect", self.connect)
eth.Set("stopMining", self.stopMining)
eth.Set("startMining", self.startMining)
eth.Set("dump", self.dump)
eth.Set("export", self.export)
}
/*
* The following methods are natively implemented javascript functions
*/
func (self *JSRepl) dump(call otto.FunctionCall) otto.Value {
var block *types.Block
if len(call.ArgumentList) > 0 {
if call.Argument(0).IsNumber() {
num, _ := call.Argument(0).ToInteger()
block = self.ethereum.ChainManager().GetBlockByNumber(uint64(num))
} else if call.Argument(0).IsString() {
hash, _ := call.Argument(0).ToString()
block = self.ethereum.ChainManager().GetBlock(ethutil.Hex2Bytes(hash))
} else {
fmt.Println("invalid argument for dump. Either hex string or number")
}
if block == nil {
fmt.Println("block not found")
return otto.UndefinedValue()
}
} else {
block = self.ethereum.ChainManager().CurrentBlock()
}
statedb := state.New(block.Root(), self.ethereum.Db())
v, _ := self.re.Vm.ToValue(statedb.RawDump())
return v
}
func (self *JSRepl) stopMining(call otto.FunctionCall) otto.Value {
self.xeth.Miner().Stop()
return otto.TrueValue()
}
func (self *JSRepl) startMining(call otto.FunctionCall) otto.Value {
self.xeth.Miner().Start()
return otto.TrueValue()
}
func (self *JSRepl) connect(call otto.FunctionCall) otto.Value {
nodeURL, err := call.Argument(0).ToString()
if err != nil {
return otto.FalseValue()
}
if err := self.ethereum.SuggestPeer(nodeURL); err != nil {
return otto.FalseValue()
}
return otto.TrueValue()
}
func (self *JSRepl) export(call otto.FunctionCall) otto.Value {
if len(call.ArgumentList) == 0 {
fmt.Println("err: require file name")
return otto.FalseValue()
}
fn, err := call.Argument(0).ToString()
if err != nil {
fmt.Println(err)
return otto.FalseValue()
}
data := self.ethereum.ChainManager().Export()
if err := ethutil.WriteFile(fn, data); err != nil {
fmt.Println(err)
return otto.FalseValue()
}
return otto.TrueValue()
}

144
cmd/ethereum/repl/repl_darwin.go
View File

@ -1,144 +0,0 @@
// Copyright (c) 2013-2014, Jeffrey Wilcke. All rights reserved.
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public
// License as published by the Free Software Foundation; either
// version 2.1 of the License, or (at your option) any later version.
//
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
// General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this library; if not, write to the Free Software
// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
// MA 02110-1301 USA
package ethrepl
// #cgo darwin CFLAGS: -I/usr/local/opt/readline/include
// #cgo darwin LDFLAGS: -L/usr/local/opt/readline/lib
// #cgo LDFLAGS: -lreadline
// #include <stdio.h>
// #include <stdlib.h>
// #include <readline/readline.h>
// #include <readline/history.h>
import "C"
import (
"fmt"
"os"
"os/signal"
"strings"
"syscall"
"unsafe"
)
func initReadLine() {
C.rl_catch_sigwinch = 0
C.rl_catch_signals = 0
c := make(chan os.Signal, 1)
signal.Notify(c, syscall.SIGWINCH)
signal.Notify(c, os.Interrupt)
go func() {
for sig := range c {
switch sig {
case syscall.SIGWINCH:
C.rl_resize_terminal()
case os.Interrupt:
C.rl_cleanup_after_signal()
default:
}
}
}()
}
func readLine(prompt *string) *string {
var p *C.char
//readline allows an empty prompt(NULL)
if prompt != nil {
p = C.CString(*prompt)
}
ret := C.readline(p)
if p != nil {
C.free(unsafe.Pointer(p))
}
if ret == nil {
return nil
} //EOF
s := C.GoString(ret)
C.free(unsafe.Pointer(ret))
return &s
}
func addHistory(s string) {
p := C.CString(s)
C.add_history(p)
C.free(unsafe.Pointer(p))
}
var indentCount = 0
var str = ""
func (self *JSRepl) setIndent() {
open := strings.Count(str, "{")
open += strings.Count(str, "(")
closed := strings.Count(str, "}")
closed += strings.Count(str, ")")
indentCount = open - closed
if indentCount <= 0 {
self.prompt = "> "
} else {
self.prompt = strings.Join(make([]string, indentCount*2), "..")
self.prompt += " "
}
}
func (self *JSRepl) read() {
initReadLine()
L:
for {
switch result := readLine(&self.prompt); true {
case result == nil:
break L
case *result != "":
str += *result + "\n"
self.setIndent()
if indentCount <= 0 {
if *result == "exit" {
self.Stop()
break L
}
hist := str[:len(str)-1]
addHistory(hist) //allow user to recall this line
self.history.WriteString(str)
self.parseInput(str)
str = ""
}
}
}
}
func (self *JSRepl) PrintValue(v interface{}) {
method, _ := self.re.Vm.Get("prettyPrint")
v, err := self.re.Vm.ToValue(v)
if err == nil {
val, err := method.Call(method, v)
if err == nil {
fmt.Printf("%v", val)
}
}
}

1
cmd/ethereum/repl/repl_linux.go
View File

@ -1 +0,0 @@
repl_darwin.go

92
cmd/ethereum/repl/repl_windows.go
View File

@ -1,92 +0,0 @@
// Copyright (c) 2013-2014, Jeffrey Wilcke. All rights reserved.
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public
// License as published by the Free Software Foundation; either
// version 2.1 of the License, or (at your option) any later version.
//
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
// General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this library; if not, write to the Free Software
// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
// MA 02110-1301 USA
package ethrepl
import (
"bufio"
"fmt"
"os"
"strings"
)
func (self *JSRepl) read() {
reader := bufio.NewReader(os.Stdin)
for {
fmt.Printf(self.prompt)
str, _, err := reader.ReadLine()
if err != nil {
fmt.Println("Error reading input", err)
} else {
if string(str) == "exit" {
self.Stop()
break
} else {
self.parseInput(string(str))
}
}
}
}
func addHistory(s string) {
}
func printColored(outputVal string) {
for outputVal != "" {
codePart := ""
if strings.HasPrefix(outputVal, "\033[32m") {
codePart = "\033[32m"
changeColor(2)
}
if strings.HasPrefix(outputVal, "\033[1m\033[30m") {
codePart = "\033[1m\033[30m"
changeColor(8)
}
if strings.HasPrefix(outputVal, "\033[31m") {
codePart = "\033[31m"
changeColor(red)
}
if strings.HasPrefix(outputVal, "\033[35m") {
codePart = "\033[35m"
changeColor(5)
}
if strings.HasPrefix(outputVal, "\033[0m") {
codePart = "\033[0m"
resetColorful()
}
textPart := outputVal[len(codePart):len(outputVal)]
index := strings.Index(textPart, "\033")
if index == -1 {
outputVal = ""
} else {
outputVal = textPart[index:len(textPart)]
textPart = textPart[0:index]
}
fmt.Printf("%v", textPart)
}
}
func (self *JSRepl) PrintValue(v interface{}) {
method, _ := self.re.Vm.Get("prettyPrint")
v, err := self.re.Vm.ToValue(v)
if err == nil {
val, err := method.Call(method, v)
if err == nil {
printColored(fmt.Sprintf("%v", val))
}
}
}