quic: rename Listener to Endpoint

The name Listener is confusing, because unlike a net.Listener
a quic.Listener manages outgoing connections as well as inbound ones.

Rename to "endpoint" which doesn't map to any existing
net package name and matches the terminology of the QUIC RFCs.

For golang/go#58547

Change-Id: If87f8c67ac7dd15d89d2d082a8ba2c63ea7f6e26
Reviewed-on: https://go-review.googlesource.com/c/net/+/543298
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Jonathan Amsterdam <jba@google.com>

internal/quic/cmd/interop/main.go

@@ -157,7 +157,7 @@ func basicTest(ctx context.Context, config *quic.Config, urls []string) {
 	}
 }
 
-func serve(ctx context.Context, l *quic.Listener) error {
+func serve(ctx context.Context, l *quic.Endpoint) error {
 	for {
 		c, err := l.Accept(ctx)
 		if err != nil {
@@ -221,7 +221,7 @@ func parseURL(s string) (u *url.URL, authority string, err error) {
 	return u, authority, nil
 }
 
-func fetchFrom(ctx context.Context, l *quic.Listener, addr string, urls []*url.URL) {
+func fetchFrom(ctx context.Context, l *quic.Endpoint, addr string, urls []*url.URL) {
 	conn, err := l.Dial(ctx, "udp", addr)
 	if err != nil {
 		log.Printf("%v: %v", addr, err)

internal/quic/conn.go

@@ -21,7 +21,7 @@ import (
 // Multiple goroutines may invoke methods on a Conn simultaneously.
 type Conn struct {
 	side      connSide
-	listener  *Listener
+	endpoint  *Endpoint
 	config    *Config
 	testHooks connTestHooks
 	peerAddr  netip.AddrPort
@@ -92,10 +92,10 @@ type newServerConnIDs struct {
 	retrySrcConnID    []byte // source from server's Retry
 }
 
-func newConn(now time.Time, side connSide, cids newServerConnIDs, peerAddr netip.AddrPort, config *Config, l *Listener) (conn *Conn, _ error) {
+func newConn(now time.Time, side connSide, cids newServerConnIDs, peerAddr netip.AddrPort, config *Config, e *Endpoint) (conn *Conn, _ error) {
 	c := &Conn{
 		side:                 side,
-		listener:             l,
+		endpoint:             e,
 		config:               config,
 		peerAddr:             peerAddr,
 		msgc:                 make(chan any, 1),
@@ -115,8 +115,8 @@ func newConn(now time.Time, side connSide, cids newServerConnIDs, peerAddr netip
 	// non-blocking operation.
 	c.msgc = make(chan any, 1)
 
-	if l.testHooks != nil {
-		l.testHooks.newConn(c)
+	if e.testHooks != nil {
+		e.testHooks.newConn(c)
 	}
 
 	// initialConnID is the connection ID used to generate Initial packet protection keys.
@@ -187,7 +187,7 @@ func (c *Conn) confirmHandshake(now time.Time) {
 	if c.side == serverSide {
 		// When the server confirms the handshake, it sends a HANDSHAKE_DONE.
 		c.handshakeConfirmed.setUnsent()
-		c.listener.serverConnEstablished(c)
+		c.endpoint.serverConnEstablished(c)
 	} else {
 		// The client never sends a HANDSHAKE_DONE, so we set handshakeConfirmed
 		// to the received state, indicating that the handshake is confirmed and we
@@ -265,7 +265,7 @@ var errIdleTimeout = errors.New("idle timeout")
 func (c *Conn) loop(now time.Time) {
 	defer close(c.donec)
 	defer c.tls.Close()
-	defer c.listener.connDrained(c)
+	defer c.endpoint.connDrained(c)
 	defer c.logConnectionClosed()
 
 	// The connection timer sends a message to the connection loop on expiry.

internal/quic/conn_close_test.go

@@ -205,13 +205,13 @@ func TestConnCloseReceiveInHandshake(t *testing.T) {
 	tc.wantIdle("no more frames to send")
 }
 
-func TestConnCloseClosedByListener(t *testing.T) {
+func TestConnCloseClosedByEndpoint(t *testing.T) {
 	ctx := canceledContext()
 	tc := newTestConn(t, clientSide)
 	tc.handshake()
 
-	tc.listener.l.Close(ctx)
-	tc.wantFrame("listener closes connection before exiting",
+	tc.endpoint.e.Close(ctx)
+	tc.wantFrame("endpoint closes connection before exiting",
 		packetType1RTT, debugFrameConnectionCloseTransport{
 			code: errNo,
 		})

internal/quic/conn_id.go

@@ -76,7 +76,7 @@ func (s *connIDState) initClient(c *Conn) error {
 		cid: locid,
 	})
 	s.nextLocalSeq = 1
-	c.listener.connsMap.updateConnIDs(func(conns *connsMap) {
+	c.endpoint.connsMap.updateConnIDs(func(conns *connsMap) {
 		conns.addConnID(c, locid)
 	})
 
@@ -117,7 +117,7 @@ func (s *connIDState) initServer(c *Conn, cids newServerConnIDs) error {
 		cid: locid,
 	})
 	s.nextLocalSeq = 1
-	c.listener.connsMap.updateConnIDs(func(conns *connsMap) {
+	c.endpoint.connsMap.updateConnIDs(func(conns *connsMap) {
 		conns.addConnID(c, dstConnID)
 		conns.addConnID(c, locid)
 	})
@@ -194,7 +194,7 @@ func (s *connIDState) issueLocalIDs(c *Conn) error {
 		s.needSend = true
 		toIssue--
 	}
-	c.listener.connsMap.updateConnIDs(func(conns *connsMap) {
+	c.endpoint.connsMap.updateConnIDs(func(conns *connsMap) {
 		for _, cid := range newIDs {
 			conns.addConnID(c, cid)
 		}
@@ -247,7 +247,7 @@ func (s *connIDState) validateTransportParameters(c *Conn, isRetry bool, p trans
 		}
 		token := statelessResetToken(p.statelessResetToken)
 		s.remote[0].resetToken = token
-		c.listener.connsMap.updateConnIDs(func(conns *connsMap) {
+		c.endpoint.connsMap.updateConnIDs(func(conns *connsMap) {
 			conns.addResetToken(c, token)
 		})
 	}
@@ -276,7 +276,7 @@ func (s *connIDState) handlePacket(c *Conn, ptype packetType, srcConnID []byte)
 			// the client. Discard the transient, client-chosen connection ID used
 			// for Initial packets; the client will never send it again.
 			cid := s.local[0].cid
-			c.listener.connsMap.updateConnIDs(func(conns *connsMap) {
+			c.endpoint.connsMap.updateConnIDs(func(conns *connsMap) {
 				conns.retireConnID(c, cid)
 			})
 			s.local = append(s.local[:0], s.local[1:]...)
@@ -314,7 +314,7 @@ func (s *connIDState) handleNewConnID(c *Conn, seq, retire int64, cid []byte, re
 		rcid := &s.remote[i]
 		if !rcid.retired && rcid.seq >= 0 && rcid.seq < s.retireRemotePriorTo {
 			s.retireRemote(rcid)
-			c.listener.connsMap.updateConnIDs(func(conns *connsMap) {
+			c.endpoint.connsMap.updateConnIDs(func(conns *connsMap) {
 				conns.retireResetToken(c, rcid.resetToken)
 			})
 		}
@@ -350,7 +350,7 @@ func (s *connIDState) handleNewConnID(c *Conn, seq, retire int64, cid []byte, re
 			s.retireRemote(&s.remote[len(s.remote)-1])
 		} else {
 			active++
-			c.listener.connsMap.updateConnIDs(func(conns *connsMap) {
+			c.endpoint.connsMap.updateConnIDs(func(conns *connsMap) {
 				conns.addResetToken(c, resetToken)
 			})
 		}
@@ -399,7 +399,7 @@ func (s *connIDState) handleRetireConnID(c *Conn, seq int64) error {
 	for i := range s.local {
 		if s.local[i].seq == seq {
 			cid := s.local[i].cid
-			c.listener.connsMap.updateConnIDs(func(conns *connsMap) {
+			c.endpoint.connsMap.updateConnIDs(func(conns *connsMap) {
 				conns.retireConnID(c, cid)
 			})
 			s.local = append(s.local[:i], s.local[i+1:]...)
@@ -463,7 +463,7 @@ func (s *connIDState) appendFrames(c *Conn, pnum packetNumber, pto bool) bool {
 			s.local[i].seq,
 			retireBefore,
 			s.local[i].cid,
-			c.listener.resetGen.tokenForConnID(s.local[i].cid),
+			c.endpoint.resetGen.tokenForConnID(s.local[i].cid),
 		) {
 			return false
 		}

internal/quic/conn_id_test.go

@@ -651,16 +651,16 @@ func TestConnIDsCleanedUpAfterClose(t *testing.T) {
 		// Wait for the conn to drain.
 		// Then wait for the conn loop to exit,
 		// and force an immediate sync of the connsMap updates
-		// (normally only done by the listener read loop).
+		// (normally only done by the endpoint read loop).
 		tc.advanceToTimer()
 		<-tc.conn.donec
-		tc.listener.l.connsMap.applyUpdates()
+		tc.endpoint.e.connsMap.applyUpdates()
 
-		if got := len(tc.listener.l.connsMap.byConnID); got != 0 {
-			t.Errorf("%v conn ids in listener map after closing, want 0", got)
+		if got := len(tc.endpoint.e.connsMap.byConnID); got != 0 {
+			t.Errorf("%v conn ids in endpoint map after closing, want 0", got)
 		}
-		if got := len(tc.listener.l.connsMap.byResetToken); got != 0 {
-			t.Errorf("%v reset tokens in listener map after closing, want 0", got)
+		if got := len(tc.endpoint.e.connsMap.byResetToken); got != 0 {
+			t.Errorf("%v reset tokens in endpoint map after closing, want 0", got)
 		}
 	})
 }

internal/quic/conn_send.go

@@ -170,7 +170,7 @@ func (c *Conn) maybeSend(now time.Time) (next time.Time) {
 			}
 		}
 
-		c.listener.sendDatagram(buf, c.peerAddr)
+		c.endpoint.sendDatagram(buf, c.peerAddr)
 	}
 }