implement sending of STREAM_ID_BLOCKED frames

session.go

@@ -568,6 +568,7 @@ func (s *session) handleFrames(fs []wire.Frame, encLevel protocol.EncryptionLeve
 			err = s.handleMaxStreamIDFrame(frame)
 		case *wire.BlockedFrame:
 		case *wire.StreamBlockedFrame:
+		case *wire.StreamIDBlockedFrame:
 		case *wire.StopSendingFrame:
 			err = s.handleStopSendingFrame(frame)
 		case *wire.PingFrame:

session_test.go

@@ -415,6 +415,16 @@ var _ = Describe("Session", func() {
 			Expect(err).NotTo(HaveOccurred())
 		})
 
+		It("handles STREAM_BLOCKED frames", func() {
+			err := sess.handleFrames([]wire.Frame{&wire.StreamBlockedFrame{}}, protocol.EncryptionUnspecified)
+			Expect(err).NotTo(HaveOccurred())
+		})
+
+		It("handles STREAM_ID_BLOCKED frames", func() {
+			err := sess.handleFrames([]wire.Frame{&wire.StreamIDBlockedFrame{}}, protocol.EncryptionUnspecified)
+			Expect(err).NotTo(HaveOccurred())
+		})
+
 		It("errors on GOAWAY frames", func() {
 			err := sess.handleFrames([]wire.Frame{&wire.GoawayFrame{}}, protocol.EncryptionUnspecified)
 			Expect(err).To(MatchError("unimplemented: handling GOAWAY frames"))

streams_map.go

@@ -64,7 +64,11 @@ func newStreamsMap(
 	newUniReceiveStream := func(id protocol.StreamID) receiveStreamI {
 		return newReceiveStream(id, m.sender, m.newFlowController(id), version)
 	}
-	m.outgoingBidiStreams = newOutgoingBidiStreamsMap(firstOutgoingBidiStream, newBidiStream)
+	m.outgoingBidiStreams = newOutgoingBidiStreamsMap(
+		firstOutgoingBidiStream,
+		newBidiStream,
+		sender.queueControlFrame,
+	)
 	// TODO(#523): make these values configurable
 	m.incomingBidiStreams = newIncomingBidiStreamsMap(
 		firstIncomingBidiStream,
@@ -73,7 +77,11 @@ func newStreamsMap(
 		sender.queueControlFrame,
 		newBidiStream,
 	)
-	m.outgoingUniStreams = newOutgoingUniStreamsMap(firstOutgoingUniStream, newUniSendStream)
+	m.outgoingUniStreams = newOutgoingUniStreamsMap(
+		firstOutgoingUniStream,
+		newUniSendStream,
+		sender.queueControlFrame,
+	)
 	// TODO(#523): make these values configurable
 	m.incomingUniStreams = newIncomingUniStreamsMap(
 		firstIncomingUniStream,

streams_map_outgoing_bidi.go

@@ -9,6 +9,7 @@ import (
 	"sync"
 
 	"github.com/lucas-clemente/quic-go/internal/protocol"
+	"github.com/lucas-clemente/quic-go/internal/wire"
 	"github.com/lucas-clemente/quic-go/qerr"
 )
 
@@ -18,18 +19,26 @@ type outgoingBidiStreamsMap struct {
 
 	streams map[protocol.StreamID]streamI
 
-	nextStream protocol.StreamID
-	maxStream  protocol.StreamID
-	newStream  func(protocol.StreamID) streamI
+	nextStream     protocol.StreamID // stream ID of the stream returned by OpenStream(Sync)
+	maxStream      protocol.StreamID // the maximum stream ID we're allowed to open
+	highestBlocked protocol.StreamID // the highest stream ID that we queued a STREAM_ID_BLOCKED frame for
+
+	newStream            func(protocol.StreamID) streamI
+	queueStreamIDBlocked func(*wire.StreamIDBlockedFrame)
 
 	closeErr error
 }
 
-func newOutgoingBidiStreamsMap(nextStream protocol.StreamID, newStream func(protocol.StreamID) streamI) *outgoingBidiStreamsMap {
+func newOutgoingBidiStreamsMap(
+	nextStream protocol.StreamID,
+	newStream func(protocol.StreamID) streamI,
+	queueControlFrame func(wire.Frame),
+) *outgoingBidiStreamsMap {
 	m := &outgoingBidiStreamsMap{
-		streams:    make(map[protocol.StreamID]streamI),
-		nextStream: nextStream,
-		newStream:  newStream,
+		streams:              make(map[protocol.StreamID]streamI),
+		nextStream:           nextStream,
+		newStream:            newStream,
+		queueStreamIDBlocked: func(f *wire.StreamIDBlockedFrame) { queueControlFrame(f) },
 	}
 	m.cond.L = &m.mutex
 	return m
@@ -63,6 +72,10 @@ func (m *outgoingBidiStreamsMap) openStreamImpl() (streamI, error) {
 		return nil, m.closeErr
 	}
 	if m.nextStream > m.maxStream {
+		if m.maxStream == 0 || m.highestBlocked < m.maxStream {
+			m.queueStreamIDBlocked(&wire.StreamIDBlockedFrame{StreamID: m.maxStream})
+			m.highestBlocked = m.maxStream
+		}
 		return nil, qerr.TooManyOpenStreams
 	}
 	s := m.newStream(m.nextStream)

streams_map_outgoing_generic.go

@@ -6,6 +6,7 @@ import (
 
 	"github.com/cheekybits/genny/generic"
 	"github.com/lucas-clemente/quic-go/internal/protocol"
+	"github.com/lucas-clemente/quic-go/internal/wire"
 	"github.com/lucas-clemente/quic-go/qerr"
 )
 
@@ -19,18 +20,26 @@ type outgoingItemsMap struct {
 
 	streams map[protocol.StreamID]item
 
-	nextStream protocol.StreamID
-	maxStream  protocol.StreamID
-	newStream  func(protocol.StreamID) item
+	nextStream     protocol.StreamID // stream ID of the stream returned by OpenStream(Sync)
+	maxStream      protocol.StreamID // the maximum stream ID we're allowed to open
+	highestBlocked protocol.StreamID // the highest stream ID that we queued a STREAM_ID_BLOCKED frame for
+
+	newStream            func(protocol.StreamID) item
+	queueStreamIDBlocked func(*wire.StreamIDBlockedFrame)
 
 	closeErr error
 }
 
-func newOutgoingItemsMap(nextStream protocol.StreamID, newStream func(protocol.StreamID) item) *outgoingItemsMap {
+func newOutgoingItemsMap(
+	nextStream protocol.StreamID,
+	newStream func(protocol.StreamID) item,
+	queueControlFrame func(wire.Frame),
+) *outgoingItemsMap {
 	m := &outgoingItemsMap{
-		streams:    make(map[protocol.StreamID]item),
-		nextStream: nextStream,
-		newStream:  newStream,
+		streams:              make(map[protocol.StreamID]item),
+		nextStream:           nextStream,
+		newStream:            newStream,
+		queueStreamIDBlocked: func(f *wire.StreamIDBlockedFrame) { queueControlFrame(f) },
 	}
 	m.cond.L = &m.mutex
 	return m
@@ -64,6 +73,10 @@ func (m *outgoingItemsMap) openStreamImpl() (item, error) {
 		return nil, m.closeErr
 	}
 	if m.nextStream > m.maxStream {
+		if m.maxStream == 0 || m.highestBlocked < m.maxStream {
+			m.queueStreamIDBlocked(&wire.StreamIDBlockedFrame{StreamID: m.maxStream})
+			m.highestBlocked = m.maxStream
+		}
 		return nil, qerr.TooManyOpenStreams
 	}
 	s := m.newStream(m.nextStream)

streams_map_outgoing_generic_test.go

@@ -3,7 +3,9 @@ package quic
 import (
 	"errors"
 
+	"github.com/golang/mock/gomock"
 	"github.com/lucas-clemente/quic-go/internal/protocol"
+	"github.com/lucas-clemente/quic-go/internal/wire"
 	"github.com/lucas-clemente/quic-go/qerr"
 	. "github.com/onsi/ginkgo"
 	. "github.com/onsi/gomega"
@@ -12,15 +14,17 @@ import (
 var _ = Describe("Streams Map (outgoing)", func() {
 	const firstNewStream protocol.StreamID = 10
 	var (
-		m       *outgoingItemsMap
-		newItem func(id protocol.StreamID) item
+		m          *outgoingItemsMap
+		newItem    func(id protocol.StreamID) item
+		mockSender *MockStreamSender
 	)
 
 	BeforeEach(func() {
 		newItem = func(id protocol.StreamID) item {
 			return id
 		}
-		m = newOutgoingItemsMap(firstNewStream, newItem)
+		mockSender = NewMockStreamSender(mockCtrl)
+		m = newOutgoingItemsMap(firstNewStream, newItem, mockSender.queueControlFrame)
 	})
 
 	Context("no stream ID limit", func() {
@@ -84,11 +88,13 @@ var _ = Describe("Streams Map (outgoing)", func() {
 
 	Context("with stream ID limits", func() {
 		It("errors when no stream can be opened immediately", func() {
+			mockSender.EXPECT().queueControlFrame(gomock.Any())
 			_, err := m.OpenStream()
 			Expect(err).To(MatchError(qerr.TooManyOpenStreams))
 		})
 
 		It("blocks until a stream can be opened synchronously", func() {
+			mockSender.EXPECT().queueControlFrame(gomock.Any())
 			done := make(chan struct{})
 			go func() {
 				defer GinkgoRecover()
@@ -104,6 +110,7 @@ var _ = Describe("Streams Map (outgoing)", func() {
 		})
 
 		It("stops opening synchronously when it is closed", func() {
+			mockSender.EXPECT().queueControlFrame(gomock.Any())
 			testErr := errors.New("test error")
 			done := make(chan struct{})
 			go func() {
@@ -125,5 +132,26 @@ var _ = Describe("Streams Map (outgoing)", func() {
 			Expect(err).ToNot(HaveOccurred())
 			Expect(str).To(Equal(firstNewStream))
 		})
+
+		It("queues a STREAM_ID_BLOCKED frame if no stream can be opened", func() {
+			m.SetMaxStream(firstNewStream)
+			mockSender.EXPECT().queueControlFrame(&wire.StreamIDBlockedFrame{StreamID: firstNewStream})
+			_, err := m.OpenStream()
+			Expect(err).ToNot(HaveOccurred())
+			_, err = m.OpenStream()
+			Expect(err).To(MatchError(qerr.TooManyOpenStreams))
+		})
+
+		It("only sends one STREAM_ID_BLOCKED frame for one stream ID", func() {
+			m.SetMaxStream(firstNewStream)
+			mockSender.EXPECT().queueControlFrame(&wire.StreamIDBlockedFrame{StreamID: firstNewStream})
+			_, err := m.OpenStream()
+			Expect(err).ToNot(HaveOccurred())
+			// try to open a stream twice, but expect only one STREAM_ID_BLOCKED to be sent
+			_, err = m.OpenStream()
+			Expect(err).To(MatchError(qerr.TooManyOpenStreams))
+			_, err = m.OpenStream()
+			Expect(err).To(MatchError(qerr.TooManyOpenStreams))
+		})
 	})
 })

streams_map_outgoing_uni.go

@@ -9,6 +9,7 @@ import (
 	"sync"
 
 	"github.com/lucas-clemente/quic-go/internal/protocol"
+	"github.com/lucas-clemente/quic-go/internal/wire"
 	"github.com/lucas-clemente/quic-go/qerr"
 )
 
@@ -18,18 +19,26 @@ type outgoingUniStreamsMap struct {
 
 	streams map[protocol.StreamID]sendStreamI
 
-	nextStream protocol.StreamID
-	maxStream  protocol.StreamID
-	newStream  func(protocol.StreamID) sendStreamI
+	nextStream     protocol.StreamID // stream ID of the stream returned by OpenStream(Sync)
+	maxStream      protocol.StreamID // the maximum stream ID we're allowed to open
+	highestBlocked protocol.StreamID // the highest stream ID that we queued a STREAM_ID_BLOCKED frame for
+
+	newStream            func(protocol.StreamID) sendStreamI
+	queueStreamIDBlocked func(*wire.StreamIDBlockedFrame)
 
 	closeErr error
 }
 
-func newOutgoingUniStreamsMap(nextStream protocol.StreamID, newStream func(protocol.StreamID) sendStreamI) *outgoingUniStreamsMap {
+func newOutgoingUniStreamsMap(
+	nextStream protocol.StreamID,
+	newStream func(protocol.StreamID) sendStreamI,
+	queueControlFrame func(wire.Frame),
+) *outgoingUniStreamsMap {
 	m := &outgoingUniStreamsMap{
-		streams:    make(map[protocol.StreamID]sendStreamI),
-		nextStream: nextStream,
-		newStream:  newStream,
+		streams:              make(map[protocol.StreamID]sendStreamI),
+		nextStream:           nextStream,
+		newStream:            newStream,
+		queueStreamIDBlocked: func(f *wire.StreamIDBlockedFrame) { queueControlFrame(f) },
 	}
 	m.cond.L = &m.mutex
 	return m
@@ -63,6 +72,10 @@ func (m *outgoingUniStreamsMap) openStreamImpl() (sendStreamI, error) {
 		return nil, m.closeErr
 	}
 	if m.nextStream > m.maxStream {
+		if m.maxStream == 0 || m.highestBlocked < m.maxStream {
+			m.queueStreamIDBlocked(&wire.StreamIDBlockedFrame{StreamID: m.maxStream})
+			m.highestBlocked = m.maxStream
+		}
 		return nil, qerr.TooManyOpenStreams
 	}
 	s := m.newStream(m.nextStream)

streams_map_test.go

@@ -257,6 +257,10 @@ var _ = Describe("Streams Map (for IETF QUIC)", func() {
 			})
 
 			Context("updating stream ID limits", func() {
+				BeforeEach(func() {
+					mockSender.EXPECT().queueControlFrame(gomock.Any())
+				})
+
 				It("processes the parameter for outgoing bidirectional streams", func() {
 					_, err := m.OpenStream()
 					Expect(err).To(MatchError(qerr.TooManyOpenStreams))
@@ -281,6 +285,10 @@ var _ = Describe("Streams Map (for IETF QUIC)", func() {
 			})
 
 			Context("handling MAX_STREAM_ID frames", func() {
+				BeforeEach(func() {
+					mockSender.EXPECT().queueControlFrame(gomock.Any()).AnyTimes()
+				})
+
 				It("processes IDs for outgoing bidirectional streams", func() {
 					_, err := m.OpenStream()
 					Expect(err).To(MatchError(qerr.TooManyOpenStreams))