mirror of https://github.com/status-im/op-geth.git
307 lines
7.1 KiB
Go
307 lines
7.1 KiB
Go
package p2p
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import (
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"errors"
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"fmt"
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"io"
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"net"
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"sort"
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"sync"
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"time"
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"github.com/ethereum/go-ethereum/logger"
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"github.com/ethereum/go-ethereum/p2p/discover"
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"github.com/ethereum/go-ethereum/rlp"
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)
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const (
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baseProtocolVersion = 3
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baseProtocolLength = uint64(16)
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baseProtocolMaxMsgSize = 10 * 1024 * 1024
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pingInterval = 15 * time.Second
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)
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const (
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// devp2p message codes
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handshakeMsg = 0x00
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discMsg = 0x01
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pingMsg = 0x02
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pongMsg = 0x03
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getPeersMsg = 0x04
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peersMsg = 0x05
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)
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// Peer represents a connected remote node.
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type Peer struct {
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// Peers have all the log methods.
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// Use them to display messages related to the peer.
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*logger.Logger
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conn net.Conn
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rw *conn
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running map[string]*protoRW
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wg sync.WaitGroup
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protoErr chan error
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closed chan struct{}
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disc chan DiscReason
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}
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// NewPeer returns a peer for testing purposes.
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func NewPeer(id discover.NodeID, name string, caps []Cap) *Peer {
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pipe, _ := net.Pipe()
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msgpipe, _ := MsgPipe()
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conn := &conn{msgpipe, &protoHandshake{ID: id, Name: name, Caps: caps}}
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peer := newPeer(pipe, conn, nil)
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close(peer.closed) // ensures Disconnect doesn't block
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return peer
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}
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// ID returns the node's public key.
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func (p *Peer) ID() discover.NodeID {
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return p.rw.ID
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}
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// Name returns the node name that the remote node advertised.
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func (p *Peer) Name() string {
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return p.rw.Name
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}
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// Caps returns the capabilities (supported subprotocols) of the remote peer.
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func (p *Peer) Caps() []Cap {
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// TODO: maybe return copy
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return p.rw.Caps
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}
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// RemoteAddr returns the remote address of the network connection.
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func (p *Peer) RemoteAddr() net.Addr {
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return p.conn.RemoteAddr()
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}
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// LocalAddr returns the local address of the network connection.
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func (p *Peer) LocalAddr() net.Addr {
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return p.conn.LocalAddr()
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}
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// Disconnect terminates the peer connection with the given reason.
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// It returns immediately and does not wait until the connection is closed.
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func (p *Peer) Disconnect(reason DiscReason) {
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select {
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case p.disc <- reason:
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case <-p.closed:
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}
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}
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// String implements fmt.Stringer.
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func (p *Peer) String() string {
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return fmt.Sprintf("Peer %.8x %v", p.rw.ID[:], p.RemoteAddr())
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}
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func newPeer(fd net.Conn, conn *conn, protocols []Protocol) *Peer {
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logtag := fmt.Sprintf("Peer %.8x %v", conn.ID[:], fd.RemoteAddr())
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protomap := matchProtocols(protocols, conn.Caps, conn)
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p := &Peer{
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Logger: logger.NewLogger(logtag),
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conn: fd,
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rw: conn,
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running: protomap,
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disc: make(chan DiscReason),
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protoErr: make(chan error, len(protomap)+1), // protocols + pingLoop
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closed: make(chan struct{}),
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}
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return p
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}
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func (p *Peer) run() DiscReason {
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readErr := make(chan error, 1)
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p.wg.Add(2)
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go p.readLoop(readErr)
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go p.pingLoop()
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p.startProtocols()
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// Wait for an error or disconnect.
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var reason DiscReason
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select {
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case err := <-readErr:
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if r, ok := err.(DiscReason); ok {
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reason = r
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} else {
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// Note: We rely on protocols to abort if there is a write
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// error. It might be more robust to handle them here as well.
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p.DebugDetailf("Read error: %v\n", err)
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reason = DiscNetworkError
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}
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case err := <-p.protoErr:
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reason = discReasonForError(err)
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case reason = <-p.disc:
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}
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close(p.closed)
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p.politeDisconnect(reason)
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p.wg.Wait()
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p.Debugf("Disconnected: %v\n", reason)
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return reason
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}
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func (p *Peer) politeDisconnect(reason DiscReason) {
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if reason != DiscNetworkError {
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SendItems(p.rw, discMsg, uint(reason))
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}
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p.conn.Close()
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}
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func (p *Peer) pingLoop() {
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ping := time.NewTicker(pingInterval)
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defer p.wg.Done()
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defer ping.Stop()
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for {
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select {
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case <-ping.C:
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if err := SendItems(p.rw, pingMsg); err != nil {
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p.protoErr <- err
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return
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}
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case <-p.closed:
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return
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}
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}
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}
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func (p *Peer) readLoop(errc chan<- error) {
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defer p.wg.Done()
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for {
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msg, err := p.rw.ReadMsg()
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if err != nil {
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errc <- err
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return
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}
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msg.ReceivedAt = time.Now()
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if err = p.handle(msg); err != nil {
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errc <- err
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return
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}
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}
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}
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func (p *Peer) handle(msg Msg) error {
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switch {
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case msg.Code == pingMsg:
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msg.Discard()
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go SendItems(p.rw, pongMsg)
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case msg.Code == discMsg:
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var reason [1]DiscReason
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// This is the last message. We don't need to discard or
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// check errors because, the connection will be closed after it.
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rlp.Decode(msg.Payload, &reason)
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p.Debugf("Disconnect requested: %v\n", reason[0])
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return DiscRequested
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case msg.Code < baseProtocolLength:
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// ignore other base protocol messages
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return msg.Discard()
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default:
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// it's a subprotocol message
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proto, err := p.getProto(msg.Code)
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if err != nil {
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return fmt.Errorf("msg code out of range: %v", msg.Code)
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}
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select {
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case proto.in <- msg:
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return nil
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case <-p.closed:
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return io.EOF
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}
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}
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return nil
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}
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// matchProtocols creates structures for matching named subprotocols.
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func matchProtocols(protocols []Protocol, caps []Cap, rw MsgReadWriter) map[string]*protoRW {
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sort.Sort(capsByName(caps))
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offset := baseProtocolLength
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result := make(map[string]*protoRW)
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outer:
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for _, cap := range caps {
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for _, proto := range protocols {
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if proto.Name == cap.Name && proto.Version == cap.Version && result[cap.Name] == nil {
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result[cap.Name] = &protoRW{Protocol: proto, offset: offset, in: make(chan Msg), w: rw}
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offset += proto.Length
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continue outer
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}
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}
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}
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return result
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}
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func (p *Peer) startProtocols() {
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p.wg.Add(len(p.running))
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for _, proto := range p.running {
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proto := proto
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proto.closed = p.closed
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p.DebugDetailf("Starting protocol %s/%d\n", proto.Name, proto.Version)
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go func() {
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err := proto.Run(p, proto)
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if err == nil {
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p.DebugDetailf("Protocol %s/%d returned\n", proto.Name, proto.Version)
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err = errors.New("protocol returned")
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} else {
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p.DebugDetailf("Protocol %s/%d error: %v\n", proto.Name, proto.Version, err)
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}
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p.protoErr <- err
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p.wg.Done()
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}()
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}
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}
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// getProto finds the protocol responsible for handling
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// the given message code.
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func (p *Peer) getProto(code uint64) (*protoRW, error) {
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for _, proto := range p.running {
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if code >= proto.offset && code < proto.offset+proto.Length {
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return proto, nil
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}
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}
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return nil, newPeerError(errInvalidMsgCode, "%d", code)
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}
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// writeProtoMsg sends the given message on behalf of the given named protocol.
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// this exists because of Server.Broadcast.
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func (p *Peer) writeProtoMsg(protoName string, msg Msg) error {
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proto, ok := p.running[protoName]
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if !ok {
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return fmt.Errorf("protocol %s not handled by peer", protoName)
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}
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if msg.Code >= proto.Length {
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return newPeerError(errInvalidMsgCode, "code %x is out of range for protocol %q", msg.Code, protoName)
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}
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msg.Code += proto.offset
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return p.rw.WriteMsg(msg)
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}
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type protoRW struct {
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Protocol
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in chan Msg
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closed <-chan struct{}
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offset uint64
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w MsgWriter
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}
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func (rw *protoRW) WriteMsg(msg Msg) error {
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if msg.Code >= rw.Length {
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return newPeerError(errInvalidMsgCode, "not handled")
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}
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msg.Code += rw.offset
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return rw.w.WriteMsg(msg)
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}
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func (rw *protoRW) ReadMsg() (Msg, error) {
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select {
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case msg := <-rw.in:
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msg.Code -= rw.offset
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return msg, nil
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case <-rw.closed:
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return Msg{}, io.EOF
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}
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}
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