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send_stream_test.go
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send_stream_test.go
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package quic
import (
"bytes"
"errors"
"io"
mrand "math/rand"
"runtime"
"time"
"github.com/golang/mock/gomock"
"github.com/lucas-clemente/quic-go/internal/ackhandler"
"github.com/lucas-clemente/quic-go/internal/mocks"
"github.com/lucas-clemente/quic-go/internal/protocol"
"github.com/lucas-clemente/quic-go/internal/wire"
. "github.com/onsi/ginkgo"
. "github.com/onsi/gomega"
"github.com/onsi/gomega/gbytes"
)
var _ = Describe("Send Stream", func() {
const streamID protocol.StreamID = 1337
var (
str *sendStream
strWithTimeout io.Writer // str wrapped with gbytes.TimeoutWriter
mockFC *mocks.MockStreamFlowController
mockSender *MockStreamSender
)
BeforeEach(func() {
mockSender = NewMockStreamSender(mockCtrl)
mockFC = mocks.NewMockStreamFlowController(mockCtrl)
str = newSendStream(streamID, mockSender, mockFC, protocol.VersionWhatever)
timeout := scaleDuration(250 * time.Millisecond)
strWithTimeout = gbytes.TimeoutWriter(str, timeout)
})
expectedFrameHeaderLen := func(offset protocol.ByteCount) protocol.ByteCount {
return (&wire.StreamFrame{
StreamID: streamID,
Offset: offset,
DataLenPresent: true,
}).Length(protocol.VersionWhatever)
}
waitForWrite := func() {
EventuallyWithOffset(0, func() bool {
str.mutex.Lock()
hasData := str.dataForWriting != nil || str.nextFrame != nil
str.mutex.Unlock()
return hasData
}).Should(BeTrue())
}
getDataAtOffset := func(offset, length protocol.ByteCount) []byte {
b := make([]byte, length)
for i := protocol.ByteCount(0); i < length; i++ {
b[i] = uint8(offset + i)
}
return b
}
getData := func(length protocol.ByteCount) []byte {
return getDataAtOffset(0, length)
}
It("gets stream id", func() {
Expect(str.StreamID()).To(Equal(protocol.StreamID(1337)))
})
Context("writing", func() {
It("writes and gets all data at once", func() {
done := make(chan struct{})
go func() {
defer GinkgoRecover()
defer close(done)
mockSender.EXPECT().onHasStreamData(streamID)
n, err := strWithTimeout.Write([]byte("foobar"))
Expect(err).ToNot(HaveOccurred())
Expect(n).To(Equal(6))
}()
waitForWrite()
mockFC.EXPECT().SendWindowSize().Return(protocol.MaxByteCount)
mockFC.EXPECT().AddBytesSent(protocol.ByteCount(6))
frame, _ := str.popStreamFrame(protocol.MaxByteCount)
f := frame.Frame.(*wire.StreamFrame)
Expect(f.Data).To(Equal([]byte("foobar")))
Expect(f.Fin).To(BeFalse())
Expect(f.Offset).To(BeZero())
Expect(f.DataLenPresent).To(BeTrue())
Expect(str.writeOffset).To(Equal(protocol.ByteCount(6)))
Expect(str.dataForWriting).To(BeNil())
Eventually(done).Should(BeClosed())
})
It("writes and gets data in two turns", func() {
done := make(chan struct{})
go func() {
defer GinkgoRecover()
mockSender.EXPECT().onHasStreamData(streamID)
n, err := strWithTimeout.Write([]byte("foobar"))
Expect(err).ToNot(HaveOccurred())
Expect(n).To(Equal(6))
close(done)
}()
waitForWrite()
mockFC.EXPECT().SendWindowSize().Return(protocol.MaxByteCount).Times(2)
mockFC.EXPECT().AddBytesSent(protocol.ByteCount(3)).Times(2)
frame, _ := str.popStreamFrame(expectedFrameHeaderLen(0) + 3)
f := frame.Frame.(*wire.StreamFrame)
Expect(f.Offset).To(BeZero())
Expect(f.Fin).To(BeFalse())
Expect(f.Data).To(Equal([]byte("foo")))
Expect(f.DataLenPresent).To(BeTrue())
frame, _ = str.popStreamFrame(protocol.MaxByteCount)
f = frame.Frame.(*wire.StreamFrame)
Expect(f.Data).To(Equal([]byte("bar")))
Expect(f.Fin).To(BeFalse())
Expect(f.Offset).To(Equal(protocol.ByteCount(3)))
Expect(f.DataLenPresent).To(BeTrue())
Expect(str.popStreamFrame(1000)).To(BeNil())
Eventually(done).Should(BeClosed())
})
It("bundles small writes", func() {
done := make(chan struct{})
go func() {
defer GinkgoRecover()
mockSender.EXPECT().onHasStreamData(streamID).Times(2)
n, err := strWithTimeout.Write([]byte("foo"))
Expect(err).ToNot(HaveOccurred())
Expect(n).To(Equal(3))
n, err = strWithTimeout.Write([]byte("bar"))
Expect(err).ToNot(HaveOccurred())
Expect(n).To(Equal(3))
close(done)
}()
Eventually(done).Should(BeClosed()) // both Write calls returned without any data having been dequeued yet
mockFC.EXPECT().SendWindowSize().Return(protocol.MaxByteCount)
mockFC.EXPECT().AddBytesSent(protocol.ByteCount(6))
frame, _ := str.popStreamFrame(protocol.MaxByteCount)
f := frame.Frame.(*wire.StreamFrame)
Expect(f.Offset).To(BeZero())
Expect(f.Fin).To(BeFalse())
Expect(f.Data).To(Equal([]byte("foobar")))
})
It("writes and gets data in multiple turns, for large writes", func() {
mockFC.EXPECT().SendWindowSize().Return(protocol.MaxByteCount).Times(5)
var totalBytesSent protocol.ByteCount
mockFC.EXPECT().AddBytesSent(gomock.Any()).Do(func(l protocol.ByteCount) { totalBytesSent += l }).Times(5)
done := make(chan struct{})
go func() {
defer GinkgoRecover()
mockSender.EXPECT().onHasStreamData(streamID)
n, err := strWithTimeout.Write(getData(5000))
Expect(err).ToNot(HaveOccurred())
Expect(n).To(Equal(5000))
close(done)
}()
waitForWrite()
for i := 0; i < 5; i++ {
frame, _ := str.popStreamFrame(1100)
f := frame.Frame.(*wire.StreamFrame)
Expect(f.Offset).To(BeNumerically("~", 1100*i, 10*i))
Expect(f.Fin).To(BeFalse())
Expect(f.Data).To(Equal(getDataAtOffset(f.Offset, f.DataLen())))
Expect(f.DataLenPresent).To(BeTrue())
}
Expect(totalBytesSent).To(Equal(protocol.ByteCount(5000)))
Eventually(done).Should(BeClosed())
})
It("unblocks Write as soon as a STREAM frame can be buffered", func() {
done := make(chan struct{})
go func() {
defer GinkgoRecover()
defer close(done)
mockSender.EXPECT().onHasStreamData(streamID)
_, err := strWithTimeout.Write(getData(protocol.MaxPacketBufferSize + 3))
Expect(err).ToNot(HaveOccurred())
}()
waitForWrite()
mockFC.EXPECT().SendWindowSize().Return(protocol.MaxByteCount).Times(2)
mockFC.EXPECT().AddBytesSent(protocol.ByteCount(2))
frame, hasMoreData := str.popStreamFrame(expectedFrameHeaderLen(0) + 2)
Expect(hasMoreData).To(BeTrue())
f := frame.Frame.(*wire.StreamFrame)
Expect(f.DataLen()).To(Equal(protocol.ByteCount(2)))
Consistently(done).ShouldNot(BeClosed())
mockFC.EXPECT().AddBytesSent(protocol.ByteCount(1))
frame, hasMoreData = str.popStreamFrame(expectedFrameHeaderLen(1) + 1)
Expect(hasMoreData).To(BeTrue())
f = frame.Frame.(*wire.StreamFrame)
Expect(f.DataLen()).To(Equal(protocol.ByteCount(1)))
Eventually(done).Should(BeClosed())
})
It("only unblocks Write once a previously buffered STREAM frame has been fully dequeued", func() {
mockSender.EXPECT().onHasStreamData(streamID)
_, err := strWithTimeout.Write([]byte("foobar"))
Expect(err).ToNot(HaveOccurred())
done := make(chan struct{})
go func() {
defer GinkgoRecover()
defer close(done)
mockSender.EXPECT().onHasStreamData(streamID)
_, err := str.Write(getData(protocol.MaxPacketBufferSize))
Expect(err).ToNot(HaveOccurred())
}()
waitForWrite()
mockFC.EXPECT().SendWindowSize().Return(protocol.MaxByteCount).Times(2)
mockFC.EXPECT().AddBytesSent(protocol.ByteCount(2))
frame, hasMoreData := str.popStreamFrame(expectedFrameHeaderLen(0) + 2)
Expect(hasMoreData).To(BeTrue())
f := frame.Frame.(*wire.StreamFrame)
Expect(f.Data).To(Equal([]byte("fo")))
Consistently(done).ShouldNot(BeClosed())
mockFC.EXPECT().AddBytesSent(protocol.ByteCount(4))
frame, hasMoreData = str.popStreamFrame(expectedFrameHeaderLen(2) + 4)
Expect(hasMoreData).To(BeTrue())
f = frame.Frame.(*wire.StreamFrame)
Expect(f.Data).To(Equal([]byte("obar")))
Eventually(done).Should(BeClosed())
})
It("popStreamFrame returns nil if no data is available", func() {
frame, hasMoreData := str.popStreamFrame(1000)
Expect(frame).To(BeNil())
Expect(hasMoreData).To(BeFalse())
})
It("says if it has more data for writing", func() {
done := make(chan struct{})
go func() {
defer GinkgoRecover()
defer close(done)
mockSender.EXPECT().onHasStreamData(streamID)
n, err := strWithTimeout.Write(bytes.Repeat([]byte{0}, 100))
Expect(err).ToNot(HaveOccurred())
Expect(n).To(Equal(100))
}()
waitForWrite()
mockFC.EXPECT().SendWindowSize().Return(protocol.MaxByteCount).Times(2)
mockFC.EXPECT().AddBytesSent(gomock.Any()).Times(2)
frame, hasMoreData := str.popStreamFrame(50)
Expect(frame).ToNot(BeNil())
Expect(frame.Frame.(*wire.StreamFrame).Fin).To(BeFalse())
Expect(hasMoreData).To(BeTrue())
frame, hasMoreData = str.popStreamFrame(protocol.MaxByteCount)
Expect(frame).ToNot(BeNil())
Expect(frame.Frame.(*wire.StreamFrame).Fin).To(BeFalse())
Expect(hasMoreData).To(BeFalse())
frame, _ = str.popStreamFrame(protocol.MaxByteCount)
Expect(frame).To(BeNil())
Eventually(done).Should(BeClosed())
})
It("copies the slice while writing", func() {
frameHeaderSize := protocol.ByteCount(4)
mockFC.EXPECT().SendWindowSize().Return(protocol.MaxByteCount).Times(2)
mockFC.EXPECT().AddBytesSent(protocol.ByteCount(1))
mockFC.EXPECT().AddBytesSent(protocol.ByteCount(2))
s := []byte("foo")
done := make(chan struct{})
go func() {
defer GinkgoRecover()
defer close(done)
mockSender.EXPECT().onHasStreamData(streamID)
n, err := strWithTimeout.Write(s)
Expect(err).ToNot(HaveOccurred())
Expect(n).To(Equal(3))
}()
waitForWrite()
frame, _ := str.popStreamFrame(frameHeaderSize + 1)
f := frame.Frame.(*wire.StreamFrame)
Expect(f.Data).To(Equal([]byte("f")))
frame, _ = str.popStreamFrame(100)
Expect(frame).ToNot(BeNil())
f = frame.Frame.(*wire.StreamFrame)
Expect(f.Data).To(Equal([]byte("oo")))
s[1] = 'e'
Expect(f.Data).To(Equal([]byte("oo")))
Eventually(done).Should(BeClosed())
})
It("returns when given a nil input", func() {
n, err := strWithTimeout.Write(nil)
Expect(n).To(BeZero())
Expect(err).ToNot(HaveOccurred())
})
It("returns when given an empty slice", func() {
n, err := strWithTimeout.Write([]byte(""))
Expect(n).To(BeZero())
Expect(err).ToNot(HaveOccurred())
})
It("cancels the context when Close is called", func() {
mockSender.EXPECT().onHasStreamData(streamID)
Expect(str.Context().Done()).ToNot(BeClosed())
Expect(str.Close()).To(Succeed())
Expect(str.Context().Done()).To(BeClosed())
})
Context("flow control blocking", func() {
It("queues a BLOCKED frame if the stream is flow control blocked", func() {
mockFC.EXPECT().SendWindowSize().Return(protocol.ByteCount(0))
mockFC.EXPECT().IsNewlyBlocked().Return(true, protocol.ByteCount(12))
mockSender.EXPECT().queueControlFrame(&wire.StreamDataBlockedFrame{
StreamID: streamID,
MaximumStreamData: 12,
})
done := make(chan struct{})
go func() {
defer GinkgoRecover()
defer close(done)
mockSender.EXPECT().onHasStreamData(streamID)
_, err := str.Write([]byte("foobar"))
Expect(err).ToNot(HaveOccurred())
}()
waitForWrite()
f, hasMoreData := str.popStreamFrame(1000)
Expect(f).To(BeNil())
Expect(hasMoreData).To(BeFalse())
// make the Write go routine return
str.closeForShutdown(nil)
Eventually(done).Should(BeClosed())
})
It("says that it doesn't have any more data, when it is flow control blocked", func() {
done := make(chan struct{})
go func() {
defer GinkgoRecover()
defer close(done)
mockSender.EXPECT().onHasStreamData(streamID)
_, err := str.Write([]byte("foobar"))
Expect(err).ToNot(HaveOccurred())
}()
waitForWrite()
// first pop a STREAM frame of the maximum size allowed by flow control
mockFC.EXPECT().SendWindowSize().Return(protocol.ByteCount(3))
mockFC.EXPECT().AddBytesSent(protocol.ByteCount(3))
f, hasMoreData := str.popStreamFrame(expectedFrameHeaderLen(0) + 3)
Expect(f).ToNot(BeNil())
Expect(hasMoreData).To(BeTrue())
// try to pop again, this time noticing that we're blocked
mockFC.EXPECT().SendWindowSize()
// don't use offset 3 here, to make sure the BLOCKED frame contains the number returned by the flow controller
mockFC.EXPECT().IsNewlyBlocked().Return(true, protocol.ByteCount(10))
mockSender.EXPECT().queueControlFrame(&wire.StreamDataBlockedFrame{
StreamID: streamID,
MaximumStreamData: 10,
})
f, hasMoreData = str.popStreamFrame(1000)
Expect(f).To(BeNil())
Expect(hasMoreData).To(BeFalse())
// make the Write go routine return
str.closeForShutdown(nil)
Eventually(done).Should(BeClosed())
})
})
Context("deadlines", func() {
It("returns an error when Write is called after the deadline", func() {
str.SetWriteDeadline(time.Now().Add(-time.Second))
n, err := strWithTimeout.Write([]byte("foobar"))
Expect(err).To(MatchError(errDeadline))
Expect(n).To(BeZero())
})
It("unblocks after the deadline", func() {
mockSender.EXPECT().onHasStreamData(streamID)
deadline := time.Now().Add(scaleDuration(50 * time.Millisecond))
str.SetWriteDeadline(deadline)
n, err := strWithTimeout.Write(getData(5000))
Expect(err).To(MatchError(errDeadline))
Expect(n).To(BeZero())
Expect(time.Now()).To(BeTemporally("~", deadline, scaleDuration(20*time.Millisecond)))
})
It("unblocks when the deadline is changed to the past", func() {
mockSender.EXPECT().onHasStreamData(streamID)
str.SetWriteDeadline(time.Now().Add(time.Hour))
done := make(chan struct{})
go func() {
defer GinkgoRecover()
_, err := str.Write(getData(5000))
Expect(err).To(MatchError(errDeadline))
close(done)
}()
Consistently(done).ShouldNot(BeClosed())
str.SetWriteDeadline(time.Now().Add(-time.Hour))
Eventually(done).Should(BeClosed())
})
It("returns the number of bytes written, when the deadline expires", func() {
mockFC.EXPECT().SendWindowSize().Return(protocol.MaxByteCount).AnyTimes()
mockFC.EXPECT().AddBytesSent(gomock.Any())
deadline := time.Now().Add(scaleDuration(50 * time.Millisecond))
str.SetWriteDeadline(deadline)
var n int
writeReturned := make(chan struct{})
go func() {
defer GinkgoRecover()
defer close(writeReturned)
mockSender.EXPECT().onHasStreamData(streamID)
var err error
n, err = strWithTimeout.Write(getData(5000))
Expect(err).To(MatchError(errDeadline))
Expect(time.Now()).To(BeTemporally("~", deadline, scaleDuration(20*time.Millisecond)))
}()
waitForWrite()
frame, hasMoreData := str.popStreamFrame(50)
Expect(frame).ToNot(BeNil())
Expect(hasMoreData).To(BeTrue())
Eventually(writeReturned, scaleDuration(80*time.Millisecond)).Should(BeClosed())
Expect(n).To(BeEquivalentTo(frame.Frame.(*wire.StreamFrame).DataLen()))
})
It("doesn't pop any data after the deadline expired", func() {
mockFC.EXPECT().SendWindowSize().Return(protocol.MaxByteCount).AnyTimes()
mockFC.EXPECT().AddBytesSent(gomock.Any())
deadline := time.Now().Add(scaleDuration(50 * time.Millisecond))
str.SetWriteDeadline(deadline)
writeReturned := make(chan struct{})
go func() {
defer GinkgoRecover()
defer close(writeReturned)
mockSender.EXPECT().onHasStreamData(streamID)
_, err := strWithTimeout.Write(getData(5000))
Expect(err).To(MatchError(errDeadline))
}()
waitForWrite()
frame, hasMoreData := str.popStreamFrame(50)
Expect(frame).ToNot(BeNil())
Expect(hasMoreData).To(BeTrue())
Eventually(writeReturned, scaleDuration(80*time.Millisecond)).Should(BeClosed())
frame, hasMoreData = str.popStreamFrame(50)
Expect(frame).To(BeNil())
Expect(hasMoreData).To(BeFalse())
})
It("doesn't unblock if the deadline is changed before the first one expires", func() {
mockSender.EXPECT().onHasStreamData(streamID)
deadline1 := time.Now().Add(scaleDuration(50 * time.Millisecond))
deadline2 := time.Now().Add(scaleDuration(100 * time.Millisecond))
str.SetWriteDeadline(deadline1)
done := make(chan struct{})
go func() {
defer GinkgoRecover()
time.Sleep(scaleDuration(20 * time.Millisecond))
str.SetWriteDeadline(deadline2)
// make sure that this was actually execute before the deadline expires
Expect(time.Now()).To(BeTemporally("<", deadline1))
close(done)
}()
runtime.Gosched()
n, err := strWithTimeout.Write(getData(5000))
Expect(err).To(MatchError(errDeadline))
Expect(n).To(BeZero())
Expect(time.Now()).To(BeTemporally("~", deadline2, scaleDuration(20*time.Millisecond)))
Eventually(done).Should(BeClosed())
})
It("unblocks earlier, when a new deadline is set", func() {
mockSender.EXPECT().onHasStreamData(streamID)
deadline1 := time.Now().Add(scaleDuration(200 * time.Millisecond))
deadline2 := time.Now().Add(scaleDuration(50 * time.Millisecond))
done := make(chan struct{})
go func() {
defer GinkgoRecover()
time.Sleep(scaleDuration(10 * time.Millisecond))
str.SetWriteDeadline(deadline2)
// make sure that this was actually execute before the deadline expires
Expect(time.Now()).To(BeTemporally("<", deadline2))
close(done)
}()
str.SetWriteDeadline(deadline1)
runtime.Gosched()
_, err := strWithTimeout.Write(getData(5000))
Expect(err).To(MatchError(errDeadline))
Expect(time.Now()).To(BeTemporally("~", deadline2, scaleDuration(20*time.Millisecond)))
Eventually(done).Should(BeClosed())
})
It("doesn't unblock if the deadline is removed", func() {
mockSender.EXPECT().onHasStreamData(streamID)
deadline := time.Now().Add(scaleDuration(50 * time.Millisecond))
str.SetWriteDeadline(deadline)
deadlineUnset := make(chan struct{})
go func() {
defer GinkgoRecover()
time.Sleep(scaleDuration(20 * time.Millisecond))
str.SetWriteDeadline(time.Time{})
// make sure that this was actually execute before the deadline expires
Expect(time.Now()).To(BeTemporally("<", deadline))
close(deadlineUnset)
}()
done := make(chan struct{})
go func() {
defer GinkgoRecover()
_, err := strWithTimeout.Write(getData(5000))
Expect(err).To(MatchError("test done"))
close(done)
}()
runtime.Gosched()
Eventually(deadlineUnset).Should(BeClosed())
Consistently(done, scaleDuration(100*time.Millisecond)).ShouldNot(BeClosed())
// make the go routine return
str.closeForShutdown(errors.New("test done"))
Eventually(done).Should(BeClosed())
})
})
Context("closing", func() {
It("doesn't allow writes after it has been closed", func() {
mockSender.EXPECT().onHasStreamData(streamID)
str.Close()
_, err := strWithTimeout.Write([]byte("foobar"))
Expect(err).To(MatchError("write on closed stream 1337"))
})
It("allows FIN", func() {
mockSender.EXPECT().onHasStreamData(streamID)
str.Close()
frame, hasMoreData := str.popStreamFrame(1000)
Expect(frame).ToNot(BeNil())
f := frame.Frame.(*wire.StreamFrame)
Expect(f.Data).To(BeEmpty())
Expect(f.Fin).To(BeTrue())
Expect(f.DataLenPresent).To(BeTrue())
Expect(hasMoreData).To(BeFalse())
})
It("doesn't send a FIN when there's still data", func() {
const frameHeaderLen protocol.ByteCount = 4
mockSender.EXPECT().onHasStreamData(streamID).Times(2)
_, err := strWithTimeout.Write([]byte("foobar"))
Expect(err).ToNot(HaveOccurred())
Expect(str.Close()).To(Succeed())
mockFC.EXPECT().SendWindowSize().Return(protocol.MaxByteCount).Times(2)
mockFC.EXPECT().AddBytesSent(gomock.Any()).Times(2)
frame, _ := str.popStreamFrame(3 + frameHeaderLen)
Expect(frame).ToNot(BeNil())
f := frame.Frame.(*wire.StreamFrame)
Expect(f.Data).To(Equal([]byte("foo")))
Expect(f.Fin).To(BeFalse())
frame, _ = str.popStreamFrame(protocol.MaxByteCount)
f = frame.Frame.(*wire.StreamFrame)
Expect(f.Data).To(Equal([]byte("bar")))
Expect(f.Fin).To(BeTrue())
})
It("doesn't send a FIN when there's still data, for long writes", func() {
done := make(chan struct{})
go func() {
defer GinkgoRecover()
defer close(done)
mockSender.EXPECT().onHasStreamData(streamID)
_, err := strWithTimeout.Write(getData(5000))
Expect(err).ToNot(HaveOccurred())
mockSender.EXPECT().onHasStreamData(streamID)
Expect(str.Close()).To(Succeed())
}()
waitForWrite()
for i := 1; i <= 5; i++ {
mockFC.EXPECT().SendWindowSize().Return(protocol.MaxByteCount)
mockFC.EXPECT().AddBytesSent(gomock.Any())
if i == 5 {
Eventually(done).Should(BeClosed())
}
frame, _ := str.popStreamFrame(1100)
Expect(frame).ToNot(BeNil())
f := frame.Frame.(*wire.StreamFrame)
Expect(f.Data).To(Equal(getDataAtOffset(f.Offset, f.DataLen())))
Expect(f.Fin).To(Equal(i == 5)) // the last frame should have the FIN bit set
}
})
It("doesn't allow FIN after it is closed for shutdown", func() {
str.closeForShutdown(errors.New("test"))
f, hasMoreData := str.popStreamFrame(1000)
Expect(f).To(BeNil())
Expect(hasMoreData).To(BeFalse())
Expect(str.Close()).To(Succeed())
f, hasMoreData = str.popStreamFrame(1000)
Expect(f).To(BeNil())
Expect(hasMoreData).To(BeFalse())
})
It("doesn't allow FIN twice", func() {
mockSender.EXPECT().onHasStreamData(streamID)
str.Close()
frame, _ := str.popStreamFrame(1000)
Expect(frame).ToNot(BeNil())
f := frame.Frame.(*wire.StreamFrame)
Expect(f.Data).To(BeEmpty())
Expect(f.Fin).To(BeTrue())
frame, hasMoreData := str.popStreamFrame(1000)
Expect(frame).To(BeNil())
Expect(hasMoreData).To(BeFalse())
})
})
Context("closing for shutdown", func() {
testErr := errors.New("test")
It("returns errors when the stream is cancelled", func() {
str.closeForShutdown(testErr)
n, err := strWithTimeout.Write([]byte("foo"))
Expect(n).To(BeZero())
Expect(err).To(MatchError(testErr))
})
It("doesn't get data for writing if an error occurred", func() {
mockFC.EXPECT().SendWindowSize().Return(protocol.MaxByteCount)
mockFC.EXPECT().AddBytesSent(gomock.Any())
mockSender.EXPECT().onHasStreamData(streamID)
done := make(chan struct{})
go func() {
defer GinkgoRecover()
_, err := strWithTimeout.Write(getData(5000))
Expect(err).To(MatchError(testErr))
close(done)
}()
waitForWrite()
frame, hasMoreData := str.popStreamFrame(50) // get a STREAM frame containing some data, but not all
Expect(frame).ToNot(BeNil())
Expect(hasMoreData).To(BeTrue())
str.closeForShutdown(testErr)
frame, hasMoreData = str.popStreamFrame(1000)
Expect(frame).To(BeNil())
Expect(hasMoreData).To(BeFalse())
Eventually(done).Should(BeClosed())
})
It("cancels the context", func() {
Expect(str.Context().Done()).ToNot(BeClosed())
str.closeForShutdown(testErr)
Expect(str.Context().Done()).To(BeClosed())
})
})
})
Context("handling MAX_STREAM_DATA frames", func() {
It("informs the flow controller", func() {
mockFC.EXPECT().UpdateSendWindow(protocol.ByteCount(0x1337))
str.updateSendWindow(0x1337)
})
It("says when it has data for sending", func() {
mockFC.EXPECT().UpdateSendWindow(gomock.Any())
mockSender.EXPECT().onHasStreamData(streamID)
done := make(chan struct{})
go func() {
defer GinkgoRecover()
_, err := str.Write([]byte("foobar"))
Expect(err).ToNot(HaveOccurred())
close(done)
}()
waitForWrite()
mockSender.EXPECT().onHasStreamData(streamID)
str.updateSendWindow(42)
// make sure the Write go routine returns
str.closeForShutdown(nil)
Eventually(done).Should(BeClosed())
})
})
Context("stream cancellations", func() {
Context("canceling writing", func() {
It("queues a RESET_STREAM frame", func() {
gomock.InOrder(
mockSender.EXPECT().queueControlFrame(&wire.ResetStreamFrame{
StreamID: streamID,
FinalSize: 1234,
ErrorCode: 9876,
}),
mockSender.EXPECT().onStreamCompleted(streamID),
)
str.writeOffset = 1234
str.CancelWrite(9876)
})
// This test is inherently racy, as it tests a concurrent call to Write() and CancelRead().
// A single successful run of this test therefore doesn't mean a lot,
// for reliable results it has to be run many times.
It("returns a nil error when the whole slice has been sent out", func() {
mockSender.EXPECT().queueControlFrame(gomock.Any()).MaxTimes(1)
mockSender.EXPECT().onHasStreamData(streamID).MaxTimes(1)
mockSender.EXPECT().onStreamCompleted(streamID).MaxTimes(1)
mockFC.EXPECT().SendWindowSize().Return(protocol.MaxByteCount).MaxTimes(1)
mockFC.EXPECT().AddBytesSent(gomock.Any()).MaxTimes(1)
errChan := make(chan error)
go func() {
defer GinkgoRecover()
n, err := strWithTimeout.Write(getData(100))
if n == 0 {
errChan <- nil
return
}
errChan <- err
}()
runtime.Gosched()
go str.popStreamFrame(protocol.MaxByteCount)
go str.CancelWrite(1234)
Eventually(errChan).Should(Receive(Not(HaveOccurred())))
})
It("unblocks Write", func() {
mockSender.EXPECT().queueControlFrame(gomock.Any())
mockSender.EXPECT().onHasStreamData(streamID)
mockFC.EXPECT().SendWindowSize().Return(protocol.MaxByteCount)
mockFC.EXPECT().AddBytesSent(gomock.Any())
writeReturned := make(chan struct{})
var n int
go func() {
defer GinkgoRecover()
var err error
n, err = strWithTimeout.Write(getData(5000))
Expect(err).To(MatchError("Write on stream 1337 canceled with error code 1234"))
close(writeReturned)
}()
waitForWrite()
frame, _ := str.popStreamFrame(50)
Expect(frame).ToNot(BeNil())
mockSender.EXPECT().onStreamCompleted(streamID)
str.CancelWrite(1234)
Eventually(writeReturned).Should(BeClosed())
Expect(n).To(BeEquivalentTo(frame.Frame.(*wire.StreamFrame).DataLen()))
})
It("doesn't pop STREAM frames after being canceled", func() {
mockSender.EXPECT().queueControlFrame(gomock.Any())
mockSender.EXPECT().onHasStreamData(streamID)
mockFC.EXPECT().SendWindowSize().Return(protocol.MaxByteCount)
mockFC.EXPECT().AddBytesSent(gomock.Any())
writeReturned := make(chan struct{})
go func() {
defer GinkgoRecover()
strWithTimeout.Write(getData(100))
close(writeReturned)
}()
waitForWrite()
frame, hasMoreData := str.popStreamFrame(50)
Expect(hasMoreData).To(BeTrue())
Expect(frame).ToNot(BeNil())
mockSender.EXPECT().onStreamCompleted(streamID)
str.CancelWrite(1234)
frame, hasMoreData = str.popStreamFrame(10)
Expect(frame).To(BeNil())
Expect(hasMoreData).To(BeFalse())
Eventually(writeReturned).Should(BeClosed())
})
It("doesn't pop STREAM frames after being canceled, for large writes", func() {
mockSender.EXPECT().queueControlFrame(gomock.Any())
mockSender.EXPECT().onHasStreamData(streamID)
mockFC.EXPECT().SendWindowSize().Return(protocol.MaxByteCount)
mockFC.EXPECT().AddBytesSent(gomock.Any())
writeReturned := make(chan struct{})
go func() {
defer GinkgoRecover()
_, err := strWithTimeout.Write(getData(5000))
Expect(err).To(MatchError("Write on stream 1337 canceled with error code 1234"))
close(writeReturned)
}()
waitForWrite()
frame, hasMoreData := str.popStreamFrame(50)
Expect(hasMoreData).To(BeTrue())
Expect(frame).ToNot(BeNil())
mockSender.EXPECT().onStreamCompleted(streamID)
str.CancelWrite(1234)
frame, hasMoreData = str.popStreamFrame(10)
Expect(hasMoreData).To(BeFalse())
Expect(frame).To(BeNil())
Eventually(writeReturned).Should(BeClosed())
})
It("ignores acknowledgements for STREAM frames after it was cancelled", func() {
mockSender.EXPECT().queueControlFrame(gomock.Any())
mockSender.EXPECT().onHasStreamData(streamID)
mockFC.EXPECT().SendWindowSize().Return(protocol.MaxByteCount)
mockFC.EXPECT().AddBytesSent(gomock.Any())
writeReturned := make(chan struct{})
go func() {
defer GinkgoRecover()
strWithTimeout.Write(getData(100))
close(writeReturned)
}()
waitForWrite()
frame, hasMoreData := str.popStreamFrame(50)
Expect(hasMoreData).To(BeTrue())
Expect(frame).ToNot(BeNil())
mockSender.EXPECT().onStreamCompleted(streamID)
str.CancelWrite(1234)
frame.OnAcked(frame.Frame)
})
It("cancels the context", func() {
mockSender.EXPECT().queueControlFrame(gomock.Any())
mockSender.EXPECT().onStreamCompleted(gomock.Any())
Expect(str.Context().Done()).ToNot(BeClosed())
str.CancelWrite(1234)
Expect(str.Context().Done()).To(BeClosed())
})
It("doesn't allow further calls to Write", func() {
mockSender.EXPECT().queueControlFrame(gomock.Any())
mockSender.EXPECT().onStreamCompleted(gomock.Any())
str.CancelWrite(1234)
_, err := strWithTimeout.Write([]byte("foobar"))
Expect(err).To(MatchError("Write on stream 1337 canceled with error code 1234"))
})
It("only cancels once", func() {
mockSender.EXPECT().queueControlFrame(&wire.ResetStreamFrame{StreamID: streamID, ErrorCode: 1234})
mockSender.EXPECT().onStreamCompleted(gomock.Any())
str.CancelWrite(1234)
str.CancelWrite(4321)
})
It("queues a RESET_STREAM frame, even if the stream was already closed", func() {
mockSender.EXPECT().onHasStreamData(streamID)
mockSender.EXPECT().queueControlFrame(gomock.Any()).Do(func(f wire.Frame) {
Expect(f).To(BeAssignableToTypeOf(&wire.ResetStreamFrame{}))
})
mockSender.EXPECT().onStreamCompleted(gomock.Any())
Expect(str.Close()).To(Succeed())
// don't EXPECT any calls to queueControlFrame
str.CancelWrite(123)
})
})
Context("receiving STOP_SENDING frames", func() {
It("queues a RESET_STREAM frames, and copies the error code from the STOP_SENDING frame", func() {
mockSender.EXPECT().queueControlFrame(&wire.ResetStreamFrame{
StreamID: streamID,
ErrorCode: 101,
})
mockSender.EXPECT().onStreamCompleted(gomock.Any())
str.handleStopSendingFrame(&wire.StopSendingFrame{
StreamID: streamID,
ErrorCode: 101,
})
})
It("unblocks Write", func() {
mockSender.EXPECT().onHasStreamData(streamID)
mockSender.EXPECT().queueControlFrame(gomock.Any())
mockSender.EXPECT().onStreamCompleted(gomock.Any())
done := make(chan struct{})
go func() {
defer GinkgoRecover()
_, err := str.Write(getData(5000))
Expect(err).To(MatchError(&StreamError{
StreamID: streamID,
ErrorCode: 1234,
}))
close(done)
}()
waitForWrite()
str.handleStopSendingFrame(&wire.StopSendingFrame{
StreamID: streamID,
ErrorCode: 123,
})
Eventually(done).Should(BeClosed())
})
It("doesn't allow further calls to Write", func() {
mockSender.EXPECT().queueControlFrame(gomock.Any())
mockSender.EXPECT().onStreamCompleted(gomock.Any())
str.handleStopSendingFrame(&wire.StopSendingFrame{
StreamID: streamID,
ErrorCode: 123,
})
_, err := str.Write([]byte("foobar"))
Expect(err).To(MatchError(&StreamError{
StreamID: streamID,
ErrorCode: 1234,
}))
})
})
})
Context("retransmissions", func() {
It("queues and retrieves frames", func() {
str.numOutstandingFrames = 1
f := &wire.StreamFrame{
Data: []byte("foobar"),
Offset: 0x42,
DataLenPresent: false,
}
mockSender.EXPECT().onHasStreamData(streamID)
str.queueRetransmission(f)
frame, _ := str.popStreamFrame(protocol.MaxByteCount)
Expect(frame).ToNot(BeNil())
f = frame.Frame.(*wire.StreamFrame)
Expect(f.Offset).To(Equal(protocol.ByteCount(0x42)))
Expect(f.Data).To(Equal([]byte("foobar")))
Expect(f.DataLenPresent).To(BeTrue())
})
It("splits a retransmission", func() {
str.numOutstandingFrames = 1
sf := &wire.StreamFrame{
Data: []byte("foobar"),
Offset: 0x42,
DataLenPresent: false,
}
mockSender.EXPECT().onHasStreamData(streamID)
str.queueRetransmission(sf)
frame, hasMoreData := str.popStreamFrame(sf.Length(str.version) - 3)
Expect(frame).ToNot(BeNil())
f := frame.Frame.(*wire.StreamFrame)
Expect(hasMoreData).To(BeTrue())
Expect(f.Offset).To(Equal(protocol.ByteCount(0x42)))
Expect(f.Data).To(Equal([]byte("foo")))
Expect(f.DataLenPresent).To(BeTrue())
frame, _ = str.popStreamFrame(protocol.MaxByteCount)
Expect(frame).ToNot(BeNil())
f = frame.Frame.(*wire.StreamFrame)
Expect(f.Offset).To(Equal(protocol.ByteCount(0x45)))
Expect(f.Data).To(Equal([]byte("bar")))
Expect(f.DataLenPresent).To(BeTrue())
})
It("returns nil if the size is too small", func() {
str.numOutstandingFrames = 1
f := &wire.StreamFrame{
Data: []byte("foobar"),
Offset: 0x42,
DataLenPresent: false,
}
mockSender.EXPECT().onHasStreamData(streamID)
str.queueRetransmission(f)
frame, hasMoreData := str.popStreamFrame(2)
Expect(hasMoreData).To(BeTrue())
Expect(frame).To(BeNil())
})
It("queues lost STREAM frames", func() {
mockSender.EXPECT().onHasStreamData(streamID)
mockFC.EXPECT().SendWindowSize().Return(protocol.ByteCount(9999))
mockFC.EXPECT().AddBytesSent(protocol.ByteCount(6))
done := make(chan struct{})
go func() {
defer GinkgoRecover()
_, err := strWithTimeout.Write([]byte("foobar"))
Expect(err).ToNot(HaveOccurred())
close(done)
}()
waitForWrite()
frame, _ := str.popStreamFrame(protocol.MaxByteCount)
Eventually(done).Should(BeClosed())
Expect(frame).ToNot(BeNil())
Expect(frame.Frame.(*wire.StreamFrame).Data).To(Equal([]byte("foobar")))
// now lose the frame
mockSender.EXPECT().onHasStreamData(streamID)
frame.OnLost(frame.Frame)
newFrame, _ := str.popStreamFrame(protocol.MaxByteCount)
Expect(newFrame).ToNot(BeNil())
Expect(newFrame.Frame.(*wire.StreamFrame).Data).To(Equal([]byte("foobar")))
})
It("doesn't queue retransmissions for a stream that was canceled", func() {
mockSender.EXPECT().onHasStreamData(streamID)
mockFC.EXPECT().SendWindowSize().Return(protocol.MaxByteCount)
mockFC.EXPECT().AddBytesSent(protocol.ByteCount(6))
done := make(chan struct{})
go func() {
defer GinkgoRecover()
_, err := str.Write([]byte("foobar"))
Expect(err).ToNot(HaveOccurred())
close(done)
}()
waitForWrite()
f, _ := str.popStreamFrame(100)
Expect(f).ToNot(BeNil())
gomock.InOrder(
mockSender.EXPECT().queueControlFrame(gomock.Any()),
mockSender.EXPECT().onStreamCompleted(streamID),
)
str.CancelWrite(9876)
// don't EXPECT any calls to onHasStreamData
f.OnLost(f.Frame)
Expect(str.retransmissionQueue).To(BeEmpty())
})
})