// Copyright (c) 2013-2014, Jeffrey Wilcke. All rights reserved.
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public
// License as published by the Free Software Foundation; either
// version 2.1 of the License, or (at your option) any later version.
//
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
// General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this library; if not, write to the Free Software
// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
// MA 02110-1301 USA
package main
import (
"bufio"
"fmt"
"math/big"
"os"
"os/signal"
"path/filepath"
"strings"
"encoding/json"
"sort"
"github.com/codegangsta/cli"
"github.com/ethereum/go-ethereum/cmd/utils"
"github.com/ethereum/go-ethereum/common/docserver"
re "github.com/ethereum/go-ethereum/jsre"
"github.com/ethereum/go-ethereum/rpc"
"github.com/ethereum/go-ethereum/rpc/api"
"github.com/ethereum/go-ethereum/rpc/codec"
"github.com/ethereum/go-ethereum/rpc/comms"
"github.com/ethereum/go-ethereum/rpc/shared"
"github.com/peterh/liner"
"github.com/robertkrimen/otto"
)
type prompter interface {
AppendHistory(string)
Prompt(p string) (string, error)
PasswordPrompt(p string) (string, error)
}
type dumbterm struct{ r *bufio.Reader }
func (r dumbterm) Prompt(p string) (string, error) {
fmt.Print(p)
line, err := r.r.ReadString('\n')
return strings.TrimSuffix(line, "\n"), err
}
func (r dumbterm) PasswordPrompt(p string) (string, error) {
fmt.Println("!! Unsupported terminal, password will echo.")
fmt.Print(p)
input, err := bufio.NewReader(os.Stdin).ReadString('\n')
fmt.Println()
return input, err
}
func (r dumbterm) AppendHistory(string) {}
type jsre struct {
re *re.JSRE
wait chan *big.Int
ps1 string
atexit func()
datadir string
prompter
}
var (
loadedModulesMethods map[string][]string
)
func loadAutoCompletion(js *jsre, ipcpath string) {
modules, err := js.suportedApis(ipcpath)
if err != nil {
utils.Fatalf("Unable to determine supported modules - %v", err)
}
loadedModulesMethods = make(map[string][]string)
for module, _ := range modules {
loadedModulesMethods[module] = api.AutoCompletion[module]
}
}
func keywordCompleter(line string) []string {
results := make([]string, 0)
if strings.Contains(line, ".") {
elements := strings.Split(line, ".")
if len(elements) == 2 {
module := elements[0]
partialMethod := elements[1]
if methods, found := loadedModulesMethods[module]; found {
for _, method := range methods {
if strings.HasPrefix(method, partialMethod) { // e.g. debug.se
results = append(results, module+"."+method)
}
}
}
}
} else {
for module, methods := range loadedModulesMethods {
if line == module { // user typed in full module name, show all methods
for _, method := range methods {
results = append(results, module+"."+method)
}
} else if strings.HasPrefix(module, line) { // partial method name, e.g. admi
results = append(results, module)
}
}
}
return results
}
func apiWordCompleter(line string, pos int) (head string, completions []string, tail string) {
if len(line) == 0 {
return "", nil, ""
}
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
}
begin := line[:i]
keyword := line[i:pos]
end := line[pos:]
completionWords := keywordCompleter(keyword)
return begin, completionWords, end
}
func newJSRE(libPath, ipcpath string) *jsre {
js := &jsre{ps1: "> "}
js.wait = make(chan *big.Int)
// update state in separare forever blocks
js.re = re.New(libPath)
js.apiBindings(ipcpath)
if !liner.TerminalSupported() {
js.prompter = dumbterm{bufio.NewReader(os.Stdin)}
} else {
lr := liner.NewLiner()
js.withHistory(func(hist *os.File) { lr.ReadHistory(hist) })
lr.SetCtrlCAborts(true)
loadAutoCompletion(js, ipcpath)
lr.SetWordCompleter(apiWordCompleter)
lr.SetTabCompletionStyle(liner.TabPrints)
js.prompter = lr
js.atexit = func() {
js.withHistory(func(hist *os.File) { hist.Truncate(0); lr.WriteHistory(hist) })
lr.Close()
close(js.wait)
}
}
return js
}
func (js *jsre) apiBindings(ipcpath string) {
ethApi := rpc.NewEthereumApi(nil)
jeth := rpc.NewJeth(ethApi, js.re, ipcpath)
js.re.Set("jeth", struct{}{})
t, _ := js.re.Get("jeth")
jethObj := t.Object()
jethObj.Set("send", jeth.SendIpc)
jethObj.Set("sendAsync", jeth.SendIpc)
err := js.re.Compile("bignumber.js", re.BigNumber_JS)
if err != nil {
utils.Fatalf("Error loading bignumber.js: %v", err)
}
err = js.re.Compile("ethereum.js", re.Web3_JS)
if err != nil {
utils.Fatalf("Error loading web3.js: %v", err)
}
_, err = js.re.Eval("var web3 = require('web3');")
if err != nil {
utils.Fatalf("Error requiring web3: %v", err)
}
_, err = js.re.Eval("web3.setProvider(jeth)")
if err != nil {
utils.Fatalf("Error setting web3 provider: %v", err)
}
apis, err := js.suportedApis(ipcpath)
if err != nil {
utils.Fatalf("Unable to determine supported api's: %v", err)
}
// load only supported API's in javascript runtime
shortcuts := "var eth = web3.eth; "
for apiName, _ := range apis {
if apiName == api.Web3ApiName || apiName == api.EthApiName {
continue // manually mapped
}
if err = js.re.Compile(fmt.Sprintf("%s.js", apiName), api.Javascript(apiName)); err == nil {
shortcuts += fmt.Sprintf("var %s = web3.%s; ", apiName, apiName)
} else {
utils.Fatalf("Error loading %s.js: %v", apiName, err)
}
}
_, err = js.re.Eval(shortcuts)
if err != nil {
utils.Fatalf("Error setting namespaces: %v", err)
}
js.re.Eval(globalRegistrar + "registrar = GlobalRegistrar.at(\"" + globalRegistrarAddr + "\");")
}
var ds, _ = docserver.New("/")
/*
func (self *jsre) ConfirmTransaction(tx string) bool {
if self.ethereum.NatSpec {
notice := natspec.GetNotice(self.xeth, tx, ds)
fmt.Println(notice)
answer, _ := self.Prompt("Confirm Transaction [y/n]")
return strings.HasPrefix(strings.Trim(answer, " "), "y")
} else {
return true
}
}
func (self *jsre) UnlockAccount(addr []byte) bool {
fmt.Printf("Please unlock account %x.\n", addr)
pass, err := self.PasswordPrompt("Passphrase: ")
if err != nil {
return false
}
// TODO: allow retry
if err := self.ethereum.AccountManager().Unlock(common.BytesToAddress(addr), pass); err != nil {
return false
} else {
fmt.Println("Account is now unlocked for this session.")
return true
}
}
*/
func (self *jsre) exec(filename string) error {
if err := self.re.Exec(filename); err != nil {
self.re.Stop(false)
return fmt.Errorf("Javascript Error: %v", err)
}
self.re.Stop(true)
return nil
}
func (self *jsre) suportedApis(ipcpath string) (map[string]string, error) {
config := comms.IpcConfig{
Endpoint: ipcpath,
}
client, err := comms.NewIpcClient(config, codec.JSON)
if err != nil {
return nil, err
}
req := shared.Request{
Id: 1,
Jsonrpc: "2.0",
Method: "modules",
}
err = client.Send(req)
if err != nil {
return nil, err
}
res, err := client.Recv()
if err != nil {
return nil, err
}
if sucRes, ok := res.(shared.SuccessResponse); ok {
data, _ := json.Marshal(sucRes.Result)
apis := make(map[string]string)
err = json.Unmarshal(data, &apis)
if err == nil {
return apis, nil
}
}
return nil, fmt.Errorf("Unable to determine supported API's")
}
// show summary of current geth instance
func (self *jsre) welcome(ipcpath string) {
self.re.Eval(`console.log('instance: ' + web3.version.client);`)
self.re.Eval(`console.log(' datadir: ' + admin.datadir);`)
self.re.Eval(`console.log("coinbase: " + eth.coinbase);`)
self.re.Eval(`var lastBlockTimestamp = 1000 * eth.getBlock(eth.blockNumber).timestamp`)
self.re.Eval(`console.log("at block: " + eth.blockNumber + " (" + new Date(lastBlockTimestamp).toLocaleDateString()
+ " " + new Date(lastBlockTimestamp).toLocaleTimeString() + ")");`)
if modules, err := self.suportedApis(ipcpath); err == nil {
loadedModules := make([]string, 0)
for api, version := range modules {
loadedModules = append(loadedModules, fmt.Sprintf("%s:%s", api, version))
}
sort.Strings(loadedModules)
self.re.Eval(fmt.Sprintf("var modules = '%s';", strings.Join(loadedModules, " ")))
self.re.Eval(`console.log(" modules: " + modules);`)
}
}
func (self *jsre) batch(args cli.Args) {
statement := strings.Join(args, " ")
val, err := self.re.Run(statement)
if err != nil {
fmt.Printf("error: %v", err)
} else if val.IsDefined() && val.IsObject() {
obj, _ := self.re.Get("ret_result")
fmt.Printf("%v", obj)
} else if val.IsDefined() {
fmt.Printf("%v", val)
}
if self.atexit != nil {
self.atexit()
}
self.re.Stop(false)
}
func (self *jsre) interactive(ipcpath string) {
self.welcome(ipcpath)
// Read input lines.
prompt := make(chan string)
inputln := make(chan string)
go func() {
defer close(inputln)
for {
line, err := self.Prompt(<-prompt)
if err != nil {
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 && input == "exit" {
return
}
if input == "" {
continue
}
str += input + "\n"
self.setIndent()
if indentCount <= 0 {
hist := str[:len(str)-1]
self.AppendHistory(hist)
self.parseInput(str)
str = ""
}
}
}
}
func (self *jsre) withHistory(op func(*os.File)) {
hist, err := os.OpenFile(filepath.Join(self.datadir, "history"), os.O_RDWR|os.O_CREATE, os.ModePerm)
if err != nil {
fmt.Printf("unable to open history file: %v\n", err)
return
}
op(hist)
hist.Close()
}
func (self *jsre) parseInput(code string) {
defer func() {
if r := recover(); r != nil {
fmt.Println("[native] error", r)
}
}()
value, err := self.re.Run(code)
if err != nil {
if ottoErr, ok := err.(*otto.Error); ok {
fmt.Println(ottoErr.String())
} else {
fmt.Println(err)
}
return
}
self.printValue(value)
}
var indentCount = 0
var str = ""
func (self *jsre) setIndent() {
open := strings.Count(str, "{")
open += strings.Count(str, "(")
closed := strings.Count(str, "}")
closed += strings.Count(str, ")")
indentCount = open - closed
if indentCount <= 0 {
self.ps1 = "> "
} else {
self.ps1 = strings.Join(make([]string, indentCount*2), "..")
self.ps1 += " "
}
}
func (self *jsre) printValue(v interface{}) {
val, err := self.re.PrettyPrint(v)
if err == nil {
fmt.Printf("%v", val)
}
}
