add vendor data

vendor/github.com/quic-go/webtransport-go/streams_map.go

@@ -0,0 +1,42 @@
+package webtransport
+
+import (
+	"sync"
+
+	"github.com/quic-go/quic-go"
+)
+
+type closeFunc func(error)
+
+// The streamsMap manages the streams of a single QUIC connection.
+// Note that several WebTransport sessions can share one QUIC connection.
+type streamsMap struct {
+	mx sync.Mutex
+	m  map[quic.StreamID]closeFunc
+}
+
+func newStreamsMap() *streamsMap {
+	return &streamsMap{m: make(map[quic.StreamID]closeFunc)}
+}
+
+func (s *streamsMap) AddStream(id quic.StreamID, close closeFunc) {
+	s.mx.Lock()
+	s.m[id] = close
+	s.mx.Unlock()
+}
+
+func (s *streamsMap) RemoveStream(id quic.StreamID) {
+	s.mx.Lock()
+	delete(s.m, id)
+	s.mx.Unlock()
+}
+
+func (s *streamsMap) CloseSession(err error) {
+	s.mx.Lock()
+	defer s.mx.Unlock()
+
+	for _, cl := range s.m {
+		cl(err)
+	}
+	s.m = nil
+}