// 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}
}
func (self *Jeth) err(call otto.FunctionCall, code int, msg string, id *int64) (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
func (self *Jeth) UnlockAccount(call otto.FunctionCall) (response otto.Value) {
var account, passwd string
timeout := int64(300)
var ok bool
if len(call.ArgumentList) == 0 {
fmt.Println("expected address of account to unlock")
return otto.FalseValue()
}
if len(call.ArgumentList) >= 1 {
if accountExport, err := call.Argument(0).Export(); err == nil {
if account, ok = accountExport.(string); ok {
if len(call.ArgumentList) == 1 {
fmt.Printf("Unlock account %s\n", account)
passwd, err = PromptPassword("Passphrase: ", true)
if err != nil {
return otto.FalseValue()
}
}
}
}
}
if len(call.ArgumentList) >= 2 {
if passwdExport, err := call.Argument(1).Export(); err == nil {
passwd, _ = passwdExport.(string)
}
}
if len(call.ArgumentList) >= 3 {
if timeoutExport, err := call.Argument(2).Export(); err == nil {
timeout, _ = timeoutExport.(int64)
}
}
if val, err := call.Otto.Call("jeth.unlockAccount", nil, account, passwd, timeout); err == nil {
return val
}
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 = PromptPassword("Passphrase: ", true)
if err != nil {
return otto.FalseValue()
}
passwd2, err := PromptPassword("Repeat passphrase: ", true)
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()
}
func (self *Jeth) Send(call otto.FunctionCall) (response otto.Value) {
reqif, err := call.Argument(0).Export()
if err != nil {
return self.err(call, -32700, err.Error(), nil)
}
jsonreq, err := json.Marshal(reqif)
var reqs []rpc.JSONRequest
batch := true
err = json.Unmarshal(jsonreq, &reqs)
if err != nil {
reqs = make([]rpc.JSONRequest, 1)
err = json.Unmarshal(jsonreq, &reqs[0])
batch = false
}
call.Otto.Set("response_len", len(reqs))
call.Otto.Run("var ret_response = new Array(response_len);")
for i, req := range reqs {
err := self.client.Send(&req)
if err != nil {
return self.err(call, -32603, err.Error(), req.Id)
}
result := make(map[string]interface{})
err = self.client.Recv(&result)
if err != nil {
return self.err(call, -32603, err.Error(), req.Id)
}
_, isSuccessResponse := result["result"]
_, isErrorResponse := result["error"]
if !isSuccessResponse && !isErrorResponse {
return self.err(call, -32603, fmt.Sprintf("Invalid response"), new(int64))
}
id, _ := result["id"]
call.Otto.Set("ret_id", id)
jsonver, _ := result["jsonrpc"]
call.Otto.Set("ret_jsonrpc", jsonver)
var payload []byte
if isSuccessResponse {
payload, _ = json.Marshal(result["result"])
} else if isErrorResponse {
payload, _ = json.Marshal(result["error"])
}
call.Otto.Set("ret_result", string(payload))
call.Otto.Set("response_idx", i)
response, err = call.Otto.Run(`
ret_response[response_idx] = { jsonrpc: ret_jsonrpc, id: ret_id, result: JSON.parse(ret_result) };
`)
}
if !batch {
call.Otto.Run("ret_response = ret_response[0];")
}
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
}
/*
// handleRequest will handle user agent requests by interacting with the user and sending
// the user response back to the geth service
func (self *Jeth) handleRequest(req *shared.Request) bool {
var err error
var args []interface{}
if err = json.Unmarshal(req.Params, &args); err != nil {
glog.V(logger.Info).Infof("Unable to parse agent request - %v\n", err)
return false
}
switch req.Method {
case useragent.AskPasswordMethod:
return self.askPassword(req.Id, req.Jsonrpc, args)
case useragent.ConfirmTransactionMethod:
return self.confirmTransaction(req.Id, req.Jsonrpc, args)
}
return false
}
// askPassword will ask the user to supply the password for a given account
func (self *Jeth) askPassword(id interface{}, jsonrpc string, args []interface{}) bool {
var err error
var passwd string
if len(args) >= 1 {
if account, ok := args[0].(string); ok {
fmt.Printf("Unlock account %s\n", account)
} else {
return false
}
}
passwd, err = PromptPassword("Passphrase: ", true)
if err = self.client.Send(shared.NewRpcResponse(id, jsonrpc, passwd, err)); err != nil {
glog.V(logger.Info).Infof("Unable to send user agent ask password response - %v\n", err)
}
return err == nil
}
func (self *Jeth) confirmTransaction(id interface{}, jsonrpc string, args []interface{}) bool {
// Accept all tx which are send from this console
return self.client.Send(shared.NewRpcResponse(id, jsonrpc, true, nil)) == nil
}
*/
// 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()
}
