forked from cerc-io/plugeth
p2p: delete frameRW
This commit is contained in:
Felix Lange
parent
736e632215
commit
d084aed5e9
138
p2p/message.go
138
p2p/message.go
@ -1,15 +1,11 @@
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package p2p
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import (
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"bufio"
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"bytes"
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"encoding/binary"
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"errors"
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"fmt"
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"io"
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"io/ioutil"
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"math/big"
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"net"
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"sync"
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"sync/atomic"
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"time"
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@ -138,140 +134,6 @@ func (rw *lockedRW) WriteMsg(msg Msg) error {
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return rw.wrapped.WriteMsg(msg)
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}
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// frameRW is a MsgReadWriter that reads and writes devp2p message frames.
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// As required by the interface, ReadMsg and WriteMsg can be called from
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// multiple goroutines.
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type frameRW struct {
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net.Conn // make Conn methods available. be careful.
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bufconn *bufio.ReadWriter
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// this channel is used to 'lend' bufconn to a caller of ReadMsg
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// until the message payload has been consumed. the channel
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// receives a value when EOF is reached on the payload, unblocking
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// a pending call to ReadMsg.
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rsync chan struct{}
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// this mutex guards writes to bufconn.
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writeMu sync.Mutex
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}
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func newFrameRW(conn net.Conn, timeout time.Duration) *frameRW {
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rsync := make(chan struct{}, 1)
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rsync <- struct{}{}
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return &frameRW{
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Conn: conn,
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bufconn: bufio.NewReadWriter(bufio.NewReader(conn), bufio.NewWriter(conn)),
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rsync: rsync,
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}
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}
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var magicToken = []byte{34, 64, 8, 145}
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func (rw *frameRW) WriteMsg(msg Msg) error {
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rw.writeMu.Lock()
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defer rw.writeMu.Unlock()
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rw.SetWriteDeadline(time.Now().Add(msgWriteTimeout))
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if err := writeMsg(rw.bufconn, msg); err != nil {
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return err
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}
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return rw.bufconn.Flush()
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}
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func writeMsg(w io.Writer, msg Msg) error {
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// TODO: handle case when Size + len(code) + len(listhdr) overflows uint32
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code := ethutil.Encode(uint32(msg.Code))
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listhdr := makeListHeader(msg.Size + uint32(len(code)))
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payloadLen := uint32(len(listhdr)) + uint32(len(code)) + msg.Size
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start := make([]byte, 8)
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copy(start, magicToken)
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binary.BigEndian.PutUint32(start[4:], payloadLen)
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for _, b := range [][]byte{start, listhdr, code} {
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if _, err := w.Write(b); err != nil {
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return err
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}
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}
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_, err := io.CopyN(w, msg.Payload, int64(msg.Size))
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return err
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}
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func makeListHeader(length uint32) []byte {
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if length < 56 {
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return []byte{byte(length + 0xc0)}
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}
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enc := big.NewInt(int64(length)).Bytes()
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lenb := byte(len(enc)) + 0xf7
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return append([]byte{lenb}, enc...)
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}
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func (rw *frameRW) ReadMsg() (msg Msg, err error) {
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<-rw.rsync // wait until bufconn is ours
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rw.SetReadDeadline(time.Now().Add(frameReadTimeout))
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// read magic and payload size
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start := make([]byte, 8)
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if _, err = io.ReadFull(rw.bufconn, start); err != nil {
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return msg, err
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}
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if !bytes.HasPrefix(start, magicToken) {
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return msg, fmt.Errorf("bad magic token %x", start[:4])
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}
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size := binary.BigEndian.Uint32(start[4:])
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// decode start of RLP message to get the message code
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posr := &postrack{rw.bufconn, 0}
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s := rlp.NewStream(posr)
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if _, err := s.List(); err != nil {
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return msg, err
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}
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msg.Code, err = s.Uint()
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if err != nil {
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return msg, err
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}
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msg.Size = size - posr.p
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rw.SetReadDeadline(time.Now().Add(payloadReadTimeout))
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if msg.Size <= wholePayloadSize {
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// msg is small, read all of it and move on to the next message.
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pbuf := make([]byte, msg.Size)
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if _, err := io.ReadFull(rw.bufconn, pbuf); err != nil {
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return msg, err
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}
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rw.rsync <- struct{}{} // bufconn is available again
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msg.Payload = bytes.NewReader(pbuf)
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} else {
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// lend bufconn to the caller until it has
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// consumed the payload. eofSignal will send a value
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// on rw.rsync when EOF is reached.
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pr := &eofSignal{rw.bufconn, msg.Size, rw.rsync}
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msg.Payload = pr
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}
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return msg, nil
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}
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// postrack wraps an rlp.ByteReader with a position counter.
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type postrack struct {
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r rlp.ByteReader
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p uint32
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}
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func (r *postrack) Read(buf []byte) (int, error) {
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n, err := r.r.Read(buf)
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r.p += uint32(n)
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return n, err
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}
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func (r *postrack) ReadByte() (byte, error) {
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b, err := r.r.ReadByte()
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if err == nil {
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r.p++
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}
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return b, err
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}
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// eofSignal wraps a reader with eof signaling. the eof channel is
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// closed when the wrapped reader returns an error or when count bytes
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// have been read.
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@ -25,52 +25,6 @@ func TestNewMsg(t *testing.T) {
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}
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}
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// func TestEncodeDecodeMsg(t *testing.T) {
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// msg := NewMsg(3, 1, "000")
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// buf := new(bytes.Buffer)
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// if err := writeMsg(buf, msg); err != nil {
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// t.Fatalf("encodeMsg error: %v", err)
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// }
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// // t.Logf("encoded: %x", buf.Bytes())
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// decmsg, err := readMsg(buf)
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// if err != nil {
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// t.Fatalf("readMsg error: %v", err)
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// }
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// if decmsg.Code != 3 {
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// t.Errorf("incorrect code %d, want %d", decmsg.Code, 3)
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// }
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// if decmsg.Size != 5 {
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// t.Errorf("incorrect size %d, want %d", decmsg.Size, 5)
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// }
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// var data struct {
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// I uint
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// S string
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// }
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// if err := decmsg.Decode(&data); err != nil {
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// t.Fatalf("Decode error: %v", err)
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// }
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// if data.I != 1 {
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// t.Errorf("incorrect data.I: got %v, expected %d", data.I, 1)
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// }
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// if data.S != "000" {
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// t.Errorf("incorrect data.S: got %q, expected %q", data.S, "000")
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// }
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// }
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// func TestDecodeRealMsg(t *testing.T) {
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// data := ethutil.Hex2Bytes("2240089100000080f87e8002b5457468657265756d282b2b292f5065657220536572766572204f6e652f76302e372e382f52656c656173652f4c696e75782f672b2bc082765fb84086dd80b7aefd6a6d2e3b93f4f300a86bfb6ef7bdc97cb03f793db6bb")
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// msg, err := readMsg(bytes.NewReader(data))
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// if err != nil {
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// t.Fatalf("unexpected error: %v", err)
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// }
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// if msg.Code != 0 {
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// t.Errorf("incorrect code %d, want %d", msg.Code, 0)
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// }
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// }
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func ExampleMsgPipe() {
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rw1, rw2 := MsgPipe()
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go func() {
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