fix: basichost: Use NegotiationTimeout as fallback timeout for NewStream (#3020)

p2p/host/basic/basic_host.go

@@ -122,9 +122,10 @@ type HostOpts struct {
 	// MultistreamMuxer is essential for the *BasicHost and will use a sensible default value if omitted.
 	MultistreamMuxer *msmux.MultistreamMuxer[protocol.ID]
 
-	// NegotiationTimeout determines the read and write timeouts on streams.
-	// If 0 or omitted, it will use DefaultNegotiationTimeout.
-	// If below 0, timeouts on streams will be deactivated.
+	// NegotiationTimeout determines the read and write timeouts when negotiating
+	// protocols for streams. If 0 or omitted, it will use
+	// DefaultNegotiationTimeout. If below 0, timeouts on streams will be
+	// deactivated.
 	NegotiationTimeout time.Duration
 
 	// AddrsFactory holds a function which can be used to override or filter the result of Addrs.
@@ -689,6 +690,14 @@ func (h *BasicHost) RemoveStreamHandler(pid protocol.ID) {
 // to create one. If ProtocolID is "", writes no header.
 // (Thread-safe)
 func (h *BasicHost) NewStream(ctx context.Context, p peer.ID, pids ...protocol.ID) (str network.Stream, strErr error) {
+	if _, ok := ctx.Deadline(); !ok {
+		if h.negtimeout > 0 {
+			var cancel context.CancelFunc
+			ctx, cancel = context.WithTimeout(ctx, h.negtimeout)
+			defer cancel()
+		}
+	}
+
 	// If the caller wants to prevent the host from dialing, it should use the NoDial option.
 	if nodial, _ := network.GetNoDial(ctx); !nodial {
 		err := h.Connect(ctx, peer.AddrInfo{ID: p})

p2p/host/basic/basic_host_test.go

@@ -2,6 +2,7 @@ package basichost
 
 import (
 	"context"
+	"encoding/binary"
 	"fmt"
 	"io"
 	"reflect"
@@ -941,3 +942,56 @@ func TestTrimHostAddrList(t *testing.T) {
 		})
 	}
 }
+
+func TestHostTimeoutNewStream(t *testing.T) {
+	h1, err := NewHost(swarmt.GenSwarm(t), nil)
+	require.NoError(t, err)
+	h1.Start()
+	defer h1.Close()
+
+	const proto = "/testing"
+	h2 := swarmt.GenSwarm(t)
+
+	h2.SetStreamHandler(func(s network.Stream) {
+		// First message is multistream header. Just echo it
+		msHeader := []byte("\x19/multistream/1.0.0\n")
+		_, err := s.Read(msHeader)
+		assert.NoError(t, err)
+		_, err = s.Write(msHeader)
+		assert.NoError(t, err)
+
+		buf := make([]byte, 1024)
+		n, err := s.Read(buf)
+		assert.NoError(t, err)
+
+		msgLen, varintN := binary.Uvarint(buf[:n])
+		buf = buf[varintN:]
+		proto := buf[:int(msgLen)]
+		if string(proto) == "/ipfs/id/1.0.0\n" {
+			// Signal we don't support identify
+			na := []byte("na\n")
+			n := binary.PutUvarint(buf, uint64(len(na)))
+			copy(buf[n:], na)
+
+			_, err = s.Write(buf[:int(n)+len(na)])
+			assert.NoError(t, err)
+		} else {
+			// Stall
+			time.Sleep(5 * time.Second)
+		}
+		t.Log("Resetting")
+		s.Reset()
+	})
+
+	err = h1.Connect(context.Background(), peer.AddrInfo{
+		ID:    h2.LocalPeer(),
+		Addrs: h2.ListenAddresses(),
+	})
+	require.NoError(t, err)
+
+	// No context passed in, fallback to negtimeout
+	h1.negtimeout = time.Second
+	_, err = h1.NewStream(context.Background(), h2.LocalPeer(), proto)
+	require.Error(t, err)
+	require.ErrorContains(t, err, "context deadline exceeded")
+}