Now with files

ethrpc/packages.go

+package ethrpc
+
+import (
+	"encoding/json"
+	"errors"
+	"github.com/ethereum/eth-go/ethpub"
+	_ "log"
+)
+
+type EthereumApi struct {
+	ethp *ethpub.PEthereum
+}
+
+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
+	}
+	// Do something
+	block := p.ethp.GetBlock(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.ethp.Transact(p.ethp.GetKey().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.ethp.Create(p.ethp.GetKey().PrivateKey, args.Value, args.Gas, args.GasPrice, args.Init, args.Body)
+	*reply = NewSuccessRes(result)
+	return nil
+}
+
+func (p *EthereumApi) GetKey(args interface{}, reply *string) error {
+	*reply = NewSuccessRes(p.ethp.GetKey())
+	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.ethp.GetStateObject(args.Address)
+	value := state.GetStorage(args.Key)
+	*reply = NewSuccessRes(GetStorageAtRes{Address: args.Address, Key: args.Key, Value: value})
+	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.ethp.GetStateObject(args.Address)
+	*reply = NewSuccessRes(BalanceRes{Balance: state.Value(), 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
+}

ethrpc/server.go

+package ethrpc
+
+import (
+	"github.com/ethereum/eth-go/ethpub"
+	"github.com/ethereum/eth-go/ethutil"
+	"net"
+	"net/rpc"
+	"net/rpc/jsonrpc"
+)
+
+type JsonRpcServer struct {
+	quit     chan bool
+	listener net.Listener
+	ethp     *ethpub.PEthereum
+}
+
+func (s *JsonRpcServer) exitHandler() {
+out:
+	for {
+		select {
+		case <-s.quit:
+			s.listener.Close()
+			break out
+		}
+	}
+
+	ethutil.Config.Log.Infoln("[JSON] Shutdown JSON-RPC server")
+}
+
+func (s *JsonRpcServer) Stop() {
+	close(s.quit)
+}
+
+func (s *JsonRpcServer) Start() {
+	ethutil.Config.Log.Infoln("[JSON] Starting JSON-RPC server")
+	go s.exitHandler()
+	rpc.Register(&EthereumApi{ethp: s.ethp})
+	rpc.HandleHTTP()
+
+	for {
+		conn, err := s.listener.Accept()
+		if err != nil {
+			ethutil.Config.Log.Infoln("[JSON] Error starting JSON-RPC:", err)
+			break
+		}
+		ethutil.Config.Log.Debugln("[JSON] Incoming request.")
+		go jsonrpc.ServeConn(conn)
+	}
+}
+
+func NewJsonRpcServer(ethp *ethpub.PEthereum) *JsonRpcServer {
+	l, err := net.Listen("tcp", ":30304")
+	if err != nil {
+		ethutil.Config.Log.Infoln("Error starting JSON-RPC")
+	}
+
+	return &JsonRpcServer{
+		listener: l,
+		quit:     make(chan bool),
+		ethp:     ethp,
+	}
+}