WIP RPC interface

rpc/json.go

+package rpc
+
+import (
+	"encoding/json"
+	"io"
+)
+
+type jsonWrapper struct{}
+
+func (self jsonWrapper) Send(writer io.Writer, v interface{}) (n int, err error) {
+	var payload []byte
+	payload, err = json.Marshal(v)
+	if err != nil {
+		return 0, err
+	}
+
+	return writer.Write(payload)
+}
+
+var JSON jsonWrapper

rpc/message.go

+package rpc
+
+import "github.com/ethereum/eth-go/ethutil"
+
+type Message struct {
+	Call string        `json:"call"`
+	Args []interface{} `json:"args"`
+	Id   int           `json:"_id"`
+	Data interface{}   `json:"data"`
+}
+
+func (self *Message) Arguments() *ethutil.Value {
+	return ethutil.NewValue(self.Args)
+}

rpc/packages.go

+package rpc
+
+import (
+	"encoding/json"
+	"errors"
+	"math/big"
+	"strings"
+
+	"github.com/ethereum/eth-go/ethpipe"
+	"github.com/ethereum/eth-go/ethutil"
+)
+
+type EthereumApi struct {
+	pipe *ethpipe.JSPipe
+}
+
+type JsonArgs interface {
+	requirements() error
+}
+
+type BlockResponse struct {
+	JsonResponse
+}
+type GetBlockArgs struct {
+	BlockNumber int
+	Hash        string
+}
+
+type ErrorResponse struct {
+	Error     bool   `json:"error"`
+	ErrorText string `json:"errorText"`
+}
+
+type JsonResponse interface {
+}
+
+type SuccessRes struct {
+	Error  bool         `json:"error"`
+	Result JsonResponse `json:"result"`
+}
+
+func NewSuccessRes(object JsonResponse) string {
+	e := SuccessRes{Error: false, Result: object}
+	res, err := json.Marshal(e)
+	if err != nil {
+		// This should never happen
+		panic("Creating json error response failed, help")
+	}
+	success := string(res)
+	return success
+}
+
+func NewErrorResponse(msg string) error {
+	e := ErrorResponse{Error: true, ErrorText: msg}
+	res, err := json.Marshal(e)
+	if err != nil {
+		// This should never happen
+		panic("Creating json error response failed, help")
+	}
+	newErr := errors.New(string(res))
+	return newErr
+}
+
+func (b *GetBlockArgs) requirements() error {
+	if b.BlockNumber == 0 && b.Hash == "" {
+		return NewErrorResponse("GetBlock requires either a block 'number' or a block 'hash' as argument")
+	}
+	return nil
+}
+
+func (p *EthereumApi) GetBlock(args *GetBlockArgs, reply *string) error {
+	err := args.requirements()
+	if err != nil {
+		return err
+	}
+
+	block := p.pipe.BlockByHash(args.Hash)
+	*reply = NewSuccessRes(block)
+	return nil
+}
+
+type NewTxArgs struct {
+	Sec       string
+	Recipient string
+	Value     string
+	Gas       string
+	GasPrice  string
+	Init      string
+	Body      string
+}
+type TxResponse struct {
+	Hash string
+}
+
+func (a *NewTxArgs) requirements() error {
+	if a.Recipient == "" {
+		return NewErrorResponse("Transact requires a 'recipient' address as argument")
+	}
+	if a.Value == "" {
+		return NewErrorResponse("Transact requires a 'value' as argument")
+	}
+	if a.Gas == "" {
+		return NewErrorResponse("Transact requires a 'gas' value as argument")
+	}
+	if a.GasPrice == "" {
+		return NewErrorResponse("Transact requires a 'gasprice' value as argument")
+	}
+	return nil
+}
+
+func (a *NewTxArgs) requirementsContract() error {
+	if a.Value == "" {
+		return NewErrorResponse("Create requires a 'value' as argument")
+	}
+	if a.Gas == "" {
+		return NewErrorResponse("Create requires a 'gas' value as argument")
+	}
+	if a.GasPrice == "" {
+		return NewErrorResponse("Create requires a 'gasprice' value as argument")
+	}
+	if a.Body == "" {
+		return NewErrorResponse("Create requires a 'body' value as argument")
+	}
+	return nil
+}
+
+func (p *EthereumApi) Transact(args *NewTxArgs, reply *string) error {
+	err := args.requirements()
+	if err != nil {
+		return err
+	}
+	result, _ := p.pipe.Transact(p.pipe.Key().PrivateKey, args.Recipient, args.Value, args.Gas, args.GasPrice, args.Body)
+	*reply = NewSuccessRes(result)
+	return nil
+}
+
+func (p *EthereumApi) Create(args *NewTxArgs, reply *string) error {
+	err := args.requirementsContract()
+	if err != nil {
+		return err
+	}
+
+	result, _ := p.pipe.Transact(p.pipe.Key().PrivateKey, "", args.Value, args.Gas, args.GasPrice, args.Body)
+	*reply = NewSuccessRes(result)
+	return nil
+}
+
+type PushTxArgs struct {
+	Tx string
+}
+
+func (a *PushTxArgs) requirementsPushTx() error {
+	if a.Tx == "" {
+		return NewErrorResponse("PushTx requires a 'tx' as argument")
+	}
+	return nil
+}
+
+func (p *EthereumApi) PushTx(args *PushTxArgs, reply *string) error {
+	err := args.requirementsPushTx()
+	if err != nil {
+		return err
+	}
+	result, _ := p.pipe.PushTx(args.Tx)
+	*reply = NewSuccessRes(result)
+	return nil
+}
+
+func (p *EthereumApi) GetKey(args interface{}, reply *string) error {
+	*reply = NewSuccessRes(p.pipe.Key())
+	return nil
+}
+
+type GetStorageArgs struct {
+	Address string
+	Key     string
+}
+
+func (a *GetStorageArgs) requirements() error {
+	if a.Address == "" {
+		return NewErrorResponse("GetStorageAt requires an 'address' value as argument")
+	}
+	if a.Key == "" {
+		return NewErrorResponse("GetStorageAt requires an 'key' value as argument")
+	}
+	return nil
+}
+
+type GetStorageAtRes struct {
+	Key     string `json:"key"`
+	Value   string `json:"value"`
+	Address string `json:"address"`
+}
+
+func (p *EthereumApi) GetStorageAt(args *GetStorageArgs, reply *string) error {
+	err := args.requirements()
+	if err != nil {
+		return err
+	}
+
+	state := p.pipe.World().SafeGet(ethutil.Hex2Bytes(args.Address))
+
+	var hx string
+	if strings.Index(args.Key, "0x") == 0 {
+		hx = string([]byte(args.Key)[2:])
+	} else {
+		// Convert the incoming string (which is a bigint) into hex
+		i, _ := new(big.Int).SetString(args.Key, 10)
+		hx = ethutil.Bytes2Hex(i.Bytes())
+	}
+	logger.Debugf("GetStorageAt(%s, %s)\n", args.Address, hx)
+	value := state.Storage(ethutil.Hex2Bytes(hx))
+	*reply = NewSuccessRes(GetStorageAtRes{Address: args.Address, Key: args.Key, Value: value.Str()})
+	return nil
+}
+
+type GetTxCountArgs struct {
+	Address string `json:"address"`
+}
+type GetTxCountRes struct {
+	Nonce int `json:"nonce"`
+}
+
+func (a *GetTxCountArgs) requirements() error {
+	if a.Address == "" {
+		return NewErrorResponse("GetTxCountAt requires an 'address' value as argument")
+	}
+	return nil
+}
+
+type GetPeerCountRes struct {
+	PeerCount int `json:"peerCount"`
+}
+
+func (p *EthereumApi) GetPeerCount(args *interface{}, reply *string) error {
+	*reply = NewSuccessRes(GetPeerCountRes{PeerCount: p.pipe.PeerCount()})
+	return nil
+}
+
+type GetListeningRes struct {
+	IsListening bool `json:"isListening"`
+}
+
+func (p *EthereumApi) GetIsListening(args *interface{}, reply *string) error {
+	*reply = NewSuccessRes(GetListeningRes{IsListening: p.pipe.IsListening()})
+	return nil
+}
+
+type GetCoinbaseRes struct {
+	Coinbase string `json:"coinbase"`
+}
+
+func (p *EthereumApi) GetCoinbase(args *interface{}, reply *string) error {
+	*reply = NewSuccessRes(GetCoinbaseRes{Coinbase: p.pipe.CoinBase()})
+	return nil
+}
+
+type GetMiningRes struct {
+	IsMining bool `json:"isMining"`
+}
+
+func (p *EthereumApi) GetIsMining(args *interface{}, reply *string) error {
+	*reply = NewSuccessRes(GetMiningRes{IsMining: p.pipe.IsMining()})
+	return nil
+}
+
+func (p *EthereumApi) GetTxCountAt(args *GetTxCountArgs, reply *string) error {
+	err := args.requirements()
+	if err != nil {
+		return err
+	}
+	state := p.pipe.TxCountAt(args.Address)
+	*reply = NewSuccessRes(GetTxCountRes{Nonce: state})
+	return nil
+}
+
+type GetBalanceArgs struct {
+	Address string
+}
+
+func (a *GetBalanceArgs) requirements() error {
+	if a.Address == "" {
+		return NewErrorResponse("GetBalanceAt requires an 'address' value as argument")
+	}
+	return nil
+}
+
+type BalanceRes struct {
+	Balance string `json:"balance"`
+	Address string `json:"address"`
+}
+
+func (p *EthereumApi) GetBalanceAt(args *GetBalanceArgs, reply *string) error {
+	err := args.requirements()
+	if err != nil {
+		return err
+	}
+	state := p.pipe.World().SafeGet(ethutil.Hex2Bytes(args.Address))
+	*reply = NewSuccessRes(BalanceRes{Balance: state.Balance.String(), Address: args.Address})
+	return nil
+}
+
+type TestRes struct {
+	JsonResponse `json:"-"`
+	Answer       int `json:"answer"`
+}
+
+func (p *EthereumApi) Test(args *GetBlockArgs, reply *string) error {
+	*reply = NewSuccessRes(TestRes{Answer: 15})
+	return nil
+}

rpc/server.go

+package rpc
+
+import (
+	"fmt"
+	"net"
+	"net/rpc"
+	"net/rpc/jsonrpc"
+
+	"github.com/ethereum/eth-go/ethlog"
+	"github.com/ethereum/eth-go/ethpipe"
+)
+
+var logger = ethlog.NewLogger("JSON")
+
+type JsonRpcServer struct {
+	quit     chan bool
+	listener net.Listener
+	pipe     *ethpipe.JSPipe
+}
+
+func (s *JsonRpcServer) exitHandler() {
+out:
+	for {
+		select {
+		case <-s.quit:
+			s.listener.Close()
+			break out
+		}
+	}
+
+	logger.Infoln("Shutdown JSON-RPC server")
+}
+
+func (s *JsonRpcServer) Stop() {
+	close(s.quit)
+}
+
+func (s *JsonRpcServer) Start() {
+	logger.Infoln("Starting JSON-RPC server")
+	go s.exitHandler()
+	rpc.Register(&EthereumApi{pipe: s.pipe})
+	rpc.HandleHTTP()
+
+	for {
+		conn, err := s.listener.Accept()
+		if err != nil {
+			logger.Infoln("Error starting JSON-RPC:", err)
+			break
+		}
+		logger.Debugln("Incoming request.")
+		go jsonrpc.ServeConn(conn)
+	}
+}
+
+func NewJsonRpcServer(pipe *ethpipe.JSPipe, port int) (*JsonRpcServer, error) {
+	sport := fmt.Sprintf(":%d", port)
+	l, err := net.Listen("tcp", sport)
+	if err != nil {
+		return nil, err
+	}
+
+	return &JsonRpcServer{
+		listener: l,
+		quit:     make(chan bool),
+		pipe:     pipe,
+	}, nil
+}

rpc/writer.go

+package rpc
+
+/*
+func pack(id int, v ...interface{}) Message {
+	return Message{Data: v, Id: id}
+}
+
+func WriteOn(msg *Message, writer io.Writer) {
+	//msg := &Message{Seed: seed, Data: data}
+
+	switch msg.Call {
+	case "compile":
+		data := ethutil.NewValue(msg.Args)
+		bcode, err := ethutil.Compile(data.Get(0).Str(), false)
+		if err != nil {
+			JSON.Send(writer, pack(msg.Id, err.Error()))
+		}
+
+		code := ethutil.Bytes2Hex(bcode)
+
+		JSON.Send(writer, pack(msg.Id, code, nil))
+	case "block":
+		args := msg.Arguments()
+
+		block := pipe.BlockByNumber(int32(args.Get(0).Uint()))
+
+		JSON.Send(writer, pack(msg.Id, block))
+	case "transact":
+		if mp, ok := msg.Args[0].(map[string]interface{}); ok {
+			object := mapToTxParams(mp)
+			JSON.Send(
+				writer,
+				pack(msg.Id, args(pipe.Transact(object["from"], object["to"], object["value"], object["gas"], object["gasPrice"], object["data"]))),
+			)
+
+		}
+	case "coinbase":
+		JSON.Send(writer, pack(msg.Id, pipe.CoinBase(), msg.Seed))
+
+	case "listening":
+		JSON.Send(writer, pack(msg.Id, pipe.IsListening()))
+
+	case "mining":
+		JSON.Send(writer, pack(msg.Id, pipe.IsMining()))
+
+	case "peerCoint":
+		JSON.Send(writer, pack(msg.Id, pipe.PeerCount()))
+
+	case "countAt":
+		args := msg.Arguments()
+
+		JSON.Send(writer, pack(msg.Id, pipe.TxCountAt(args.Get(0).Str())))
+
+	case "codeAt":
+		args := msg.Arguments()
+
+		JSON.Send(writer, pack(msg.Id, len(pipe.CodeAt(args.Get(0).Str()))))
+
+	case "stateAt":
+		args := msg.Arguments()
+
+		JSON.Send(writer, pack(msg.Id, pipe.StorageAt(args.Get(0).Str(), args.Get(1).Str())))
+
+	case "balanceAt":
+		args := msg.Arguments()
+
+		JSON.Send(writer, pack(msg.Id, pipe.BalanceAt(args.Get(0).Str())))
+
+	case "newFilter":
+	case "newFilterString":
+	case "messages":
+		// TODO
+	}
+}
+*/