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package ethwire
import (
"bytes"
"errors"
"fmt"
"github.com/ethereum/eth-go/ethutil"
"net"
"time"
)
// Message:
// [4 bytes token] RLP([TYPE, DATA])
// Refer to http://wiki.ethereum.org/index.php/Wire_Protocol
// The magic token which should be the first 4 bytes of every message.
var MagicToken = []byte{34, 64, 8, 145}
type MsgType byte
const (
// Values are given explicitly instead of by iota because these values are
// defined by the wire protocol spec; it is easier for humans to ensure
// correctness when values are explicit.
MsgHandshakeTy = 0x00
MsgDiscTy = 0x01
MsgPingTy = 0x02
MsgPongTy = 0x03
MsgGetPeersTy = 0x10
MsgPeersTy = 0x11
MsgTxTy = 0x12
MsgBlockTy = 0x13
MsgGetChainTy = 0x14
MsgNotInChainTy = 0x15
MsgGetTxsTy = 0x16
MsgTalkTy = 0xff
)
var msgTypeToString = map[MsgType]string{
MsgHandshakeTy: "Handshake",
MsgDiscTy: "Disconnect",
MsgPingTy: "Ping",
MsgPongTy: "Pong",
MsgGetPeersTy: "Get peers",
MsgPeersTy: "Peers",
MsgTxTy: "Transactions",
MsgBlockTy: "Blocks",
MsgGetChainTy: "Get chain",
MsgGetTxsTy: "Get Txs",
MsgNotInChainTy: "Not in chain",
}
func (mt MsgType) String() string {
return msgTypeToString[mt]
}
type Msg struct {
Type MsgType // Specifies how the encoded data should be interpreted
//Data []byte
Data *ethutil.Value
}
func NewMessage(msgType MsgType, data interface{}) *Msg {
return &Msg{
Type: msgType,
Data: ethutil.NewValue(data),
}
}
func ReadMessage(data []byte) (msg *Msg, remaining []byte, done bool, err error) {
if len(data) == 0 {
return nil, nil, true, nil
}
if len(data) <= 8 {
return nil, remaining, false, errors.New("Invalid message")
}
// Check if the received 4 first bytes are the magic token
if bytes.Compare(MagicToken, data[:4]) != 0 {
return nil, nil, false, fmt.Errorf("MagicToken mismatch. Received %v", data[:4])
}
messageLength := ethutil.BytesToNumber(data[4:8])
remaining = data[8+messageLength:]
if int(messageLength) > len(data[8:]) {
return nil, nil, false, fmt.Errorf("message length %d, expected %d", len(data[8:]), messageLength)
}
message := data[8 : 8+messageLength]
decoder := ethutil.NewValueFromBytes(message)
// Type of message
t := decoder.Get(0).Uint()
// Actual data
d := decoder.SliceFrom(1)
msg = &Msg{
Type: MsgType(t),
Data: d,
}
return
}
func bufferedRead(conn net.Conn) ([]byte, error) {
return nil, nil
}
// The basic message reader waits for data on the given connection, decoding
// and doing a few sanity checks such as if there's a data type and
// unmarhals the given data
func ReadMessages(conn net.Conn) (msgs []*Msg, err error) {
// The recovering function in case anything goes horribly wrong
defer func() {
if r := recover(); r != nil {
err = fmt.Errorf("ethwire.ReadMessage error: %v", r)
}
}()
// Buff for writing network message to
//buff := make([]byte, 1440)
var buff []byte
var totalBytes int
for {
// Give buffering some time
conn.SetReadDeadline(time.Now().Add(500 * time.Millisecond))
// Create a new temporarily buffer
b := make([]byte, 1440)
// Wait for a message from this peer
n, _ := conn.Read(b)
if err != nil && n == 0 {
if err.Error() != "EOF" {
fmt.Println("err now", err)
return nil, err
} else {
break
}
// Messages can't be empty
} else if n == 0 {
break
}
buff = append(buff, b[:n]...)
totalBytes += n
}
// Reslice buffer
buff = buff[:totalBytes]
msg, remaining, done, err := ReadMessage(buff)
for ; done != true; msg, remaining, done, err = ReadMessage(remaining) {
//log.Println("rx", msg)
if msg != nil {
msgs = append(msgs, msg)
}
}
return
}
// The basic message writer takes care of writing data over the given
// connection and does some basic error checking
func WriteMessage(conn net.Conn, msg *Msg) error {
var pack []byte
// Encode the type and the (RLP encoded) data for sending over the wire
encoded := ethutil.NewValue(append([]interface{}{byte(msg.Type)}, msg.Data.Slice()...)).Encode()
payloadLength := ethutil.NumberToBytes(uint32(len(encoded)), 32)
// Write magic token and payload length (first 8 bytes)
pack = append(MagicToken, payloadLength...)
pack = append(pack, encoded...)
//fmt.Printf("payload %v (%v) %q\n", msg.Type, conn.RemoteAddr(), encoded)
// Write to the connection
_, err := conn.Write(pack)
if err != nil {
return err
}
return nil
}
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