/
peers.go
195 lines (167 loc) · 4.88 KB
/
peers.go
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package server
import (
"context"
"errors"
"fmt"
"net"
"time"
"github.com/zllovesuki/t/multiplexer"
"github.com/zllovesuki/t/multiplexer/alpn"
"github.com/zllovesuki/t/multiplexer/protocol"
"github.com/zllovesuki/t/mux"
"github.com/zllovesuki/t/state"
"github.com/lucas-clemente/quic-go"
"go.uber.org/zap"
)
func (s *Server) peerQUICHandshake(sess quic.Session) {
ctx, cancel := context.WithTimeout(s.parentCtx, time.Second*3)
defer cancel()
var err error
var conn quic.Stream
logger := s.logger
defer func() {
if err == nil {
return
}
sess.CloseWithError(quic.ApplicationErrorCode(0), err.Error())
}()
conn, err = sess.AcceptStream(ctx)
if err != nil {
logger.Error("error accepting quic handshake stream", zap.Error(err))
return
}
defer conn.Close()
err = s.peerNegotiation(s.logger, sess, mux.WrapQUIC(sess, conn), protocol.QUICProtos)
}
func (s *Server) peerTLSHandshake(conn net.Conn) {
var err error
logger := s.logger
defer func() {
if err == nil {
return
}
conn.Close()
}()
err = s.peerNegotiation(logger, conn, conn, protocol.TLSProtos)
}
func (s *Server) peerNegotiation(logger *zap.Logger, connector interface{}, conn net.Conn, acceptableProtocols []protocol.Protocol) (err error) {
defer func() {
if errors.Is(err, state.ErrSessionAlreadyEstablished) {
logger.Info("reusing established session")
return
}
logger.Debug("error during peer handshake", zap.Error(err))
}()
var link multiplexer.Link
r := make([]byte, multiplexer.LinkSize)
conn.SetReadDeadline(time.Now().Add(time.Second * 10))
conn.SetWriteDeadline(time.Now().Add(time.Second * 10))
_, err = conn.Read(r)
if err != nil {
err = fmt.Errorf("reading handshake: %w", err)
return
}
err = link.UnmarshalBinary(r)
if err != nil {
err = fmt.Errorf("unmarshal link: %w", err)
return
}
if link.ALPN != alpn.Multiplexer {
err = errors.New("invalid ALPN received from peer")
return
}
validProtocol := false
for _, p := range acceptableProtocols {
if p == link.Protocol {
validProtocol = true
break
}
}
if !validProtocol {
err = fmt.Errorf("unacceptable protocol: %d", link.Protocol)
return
}
_, err = multiplexer.New(link.Protocol)
if err != nil {
err = fmt.Errorf("negotiating protocol with peer: %w", err)
return
}
logger = logger.With(zap.Uint64("peerID", link.Source), zap.Object("link", link))
logger.Debug("incoming handshake with peer")
if (link.Source == 0 || link.Destination == 0) ||
(link.Source == link.Destination) ||
(link.Destination != s.PeerID()) ||
link.Source == s.PeerID() {
err = fmt.Errorf("invalid peer handshake %+v", link)
return
}
conn.SetReadDeadline(time.Time{})
conn.SetWriteDeadline(time.Time{})
err = s.peers.NewPeer(s.parentCtx, link.Protocol, multiplexer.Config{
Logger: logger,
Conn: connector,
Peer: link.Source,
Initiator: false,
Wait: time.Second,
})
if err != nil {
err = fmt.Errorf("setting up peer: %w", err)
}
return
}
func (s *Server) handlePeerEvents() {
for peer := range s.peers.Notify() {
s.logger.Info("peer registered", zap.Bool("initiator", peer.Initiator()), zap.Uint64("peer", peer.Peer()), zap.String("protocol", peer.Protocol().String()))
// listen for request for forwarding from peers
go func(p multiplexer.Peer) {
for c := range p.Handle() {
if c.Link == multiplexer.MessagingLink {
go s.openMessaging(c.Conn, p.Peer())
continue
}
s.logger.Debug("forwarding bidirectional stream", zap.Object("link", c.Link))
if _, err := s.Forward(s.parentCtx, c.Conn, c.Link); err != nil {
s.logger.Error("forwarding bidirectional stream", zap.Error(err), zap.Object("link", c.Link))
c.Conn.Close()
}
}
s.logger.Debug("exiting peer streams handler", zap.Uint64("peer", p.Peer()))
}(peer)
// handle forward request from peers
go peer.Start(s.parentCtx)
// open a messaging stream
// but only one side of the session can
go func(p multiplexer.Peer) {
if p.Initiator() {
s.logger.Debug("skip opening message stream as initiator", zap.Uint64("peer", p.Peer()))
return
}
c, err := p.Messaging(s.parentCtx)
if err != nil {
s.logger.Error("opening messaging stream", zap.Error(err), zap.Uint64("peer", p.Peer()))
return
}
go s.openMessaging(c, p.Peer())
}(peer)
// remove peer if they disconnected before gossip found out
go func(p multiplexer.Peer) {
select {
case <-s.parentCtx.Done():
case <-p.NotifyClose():
s.removePeer(p.Peer())
}
}(peer)
s.membershipCh <- struct{}{}
}
}
func (s *Server) openMessaging(c net.Conn, peer uint64) {
s.logger.Debug("opening message stream with peer", zap.Uint64("peer", peer))
ch := s.messaging.Register(peer, c)
s.handlePeerMessaging(ch, peer)
}
func (s *Server) removePeer(peer uint64) {
s.logger.Info("removing disconnected peer", zap.Uint64("peer", peer))
s.peerGraph.Remove(peer)
s.peers.Remove(peer)
s.membershipCh <- struct{}{}
}