plugeth/cmd/utils/jeth.go
Felix Lange dff9b4246f cmd/geth, cmd/utils: improve input handling
These changes make prompting behave consistently on all platforms:

* The input buffer is now global.
  Buffering was previously set up for each prompt, which can cause weird
  behaviour, e.g. when running "geth account update <input.txt" where
  input.txt contains three lines. In this case, the first password
  prompt would fill up the buffer with all lines and then use only the
  first one.

* Print the "unsupported terminal" warning only once.
  Now that stdin prompting has global state, we can use it to track
  the warning there.

* Work around small liner issues, particularly on Windows.
  Prompting didn't work under most of the third-party terminal emulators
  on Windows because liner assumes line editing is always available.
2016-04-12 15:56:49 +02:00

306 lines
8.8 KiB
Go

// 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 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 {
return otto.FalseValue()
passwd, _ = otto.ToValue(input)
} else {
throwJSExeception(err.Error())
}
} 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()
}
if ret, err := call.Otto.Call("jeth.newAccount", nil, passwd); err == nil {
return ret
} else {
fmt.Printf("%v\n", err)
return otto.FalseValue()
}
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)
return 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()
}