queue stream window updates directly from stream.Read

By queueing receive window updates directly from stream.Read, it is no
longer necessary to ask every stream for window updates when sending a
packet.

window_update_queue_test.go

@@ -0,0 +1,49 @@
+package quic
+
+import (
+	"github.com/lucas-clemente/quic-go/internal/wire"
+
+	. "github.com/onsi/ginkgo"
+	. "github.com/onsi/gomega"
+)
+
+var _ = Describe("Window Update Queue", func() {
+	var (
+		q            *windowUpdateQueue
+		queuedFrames []wire.Frame
+	)
+
+	BeforeEach(func() {
+		queuedFrames = queuedFrames[:0]
+		q = newWindowUpdateQueue(func(f wire.Frame) {
+			queuedFrames = append(queuedFrames, f)
+		})
+	})
+
+	It("adds stream offsets and gets MAX_STREAM_DATA frames", func() {
+		q.Add(1, 10)
+		q.Add(2, 20)
+		q.Add(3, 30)
+		q.QueueAll()
+		Expect(queuedFrames).To(ContainElement(&wire.MaxStreamDataFrame{StreamID: 1, ByteOffset: 10}))
+		Expect(queuedFrames).To(ContainElement(&wire.MaxStreamDataFrame{StreamID: 2, ByteOffset: 20}))
+		Expect(queuedFrames).To(ContainElement(&wire.MaxStreamDataFrame{StreamID: 3, ByteOffset: 30}))
+	})
+
+	It("deletes the entry after getting the MAX_STREAM_DATA frame", func() {
+		q.Add(10, 100)
+		q.QueueAll()
+		Expect(queuedFrames).To(HaveLen(1))
+		q.QueueAll()
+		Expect(queuedFrames).To(HaveLen(1))
+	})
+
+	It("replaces old entries", func() {
+		q.Add(10, 100)
+		q.Add(10, 200)
+		q.QueueAll()
+		Expect(queuedFrames).To(Equal([]wire.Frame{
+			&wire.MaxStreamDataFrame{StreamID: 10, ByteOffset: 200},
+		}))
+	})
+})