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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"
"runtime"
"time"
"github.com/golang/mock/gomock"
"github.com/boisjacques/qed/internal/mocks"
"github.com/boisjacques/qed/internal/protocol"
"github.com/boisjacques/qed/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)
})
waitForWrite := func() {
EventuallyWithOffset(0, func() []byte {
str.mutex.Lock()
data := str.dataForWriting
str.mutex.Unlock()
return data
}).ShouldNot(BeEmpty())
}
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() {
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()
n, err := strWithTimeout.Write([]byte("foobar"))
Expect(err).ToNot(HaveOccurred())
Expect(n).To(Equal(6))
close(done)
}()
waitForWrite()
f, _ := str.popStreamFrame(1000)
Expect(f.Data).To(Equal([]byte("foobar")))
Expect(f.FinBit).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() {
mockSender.EXPECT().onHasStreamData(streamID)
frameHeaderLen := protocol.ByteCount(4)
mockFC.EXPECT().SendWindowSize().Return(protocol.ByteCount(9999)).Times(2)
mockFC.EXPECT().AddBytesSent(gomock.Any() /* protocol.ByteCount(3)*/).Times(2)
done := make(chan struct{})
go func() {
defer GinkgoRecover()
n, err := strWithTimeout.Write([]byte("foobar"))
Expect(err).ToNot(HaveOccurred())
Expect(n).To(Equal(6))
close(done)
}()
waitForWrite()
f, _ := str.popStreamFrame(3 + frameHeaderLen)
Expect(f.Data).To(Equal([]byte("foo")))
Expect(f.FinBit).To(BeFalse())
Expect(f.Offset).To(BeZero())
Expect(f.DataLenPresent).To(BeTrue())
f, _ = str.popStreamFrame(100)
Expect(f.Data).To(Equal([]byte("bar")))
Expect(f.FinBit).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("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() {
mockSender.EXPECT().onHasStreamData(streamID)
mockFC.EXPECT().SendWindowSize().Return(protocol.ByteCount(9999)).Times(2)
mockFC.EXPECT().AddBytesSent(gomock.Any()).Times(2)
done := make(chan struct{})
go func() {
defer GinkgoRecover()
n, err := strWithTimeout.Write(bytes.Repeat([]byte{0}, 100))
Expect(err).ToNot(HaveOccurred())
Expect(n).To(Equal(100))
close(done)
}()
waitForWrite()
frame, hasMoreData := str.popStreamFrame(50)
Expect(frame).ToNot(BeNil())
Expect(hasMoreData).To(BeTrue())
frame, hasMoreData = str.popStreamFrame(1000)
Expect(frame).ToNot(BeNil())
Expect(hasMoreData).To(BeFalse())
frame, _ = str.popStreamFrame(1000)
Expect(frame).To(BeNil())
Eventually(done).Should(BeClosed())
})
It("copies the slice while writing", func() {
mockSender.EXPECT().onHasStreamData(streamID)
frameHeaderSize := protocol.ByteCount(4)
mockFC.EXPECT().SendWindowSize().Return(protocol.ByteCount(9999)).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()
n, err := strWithTimeout.Write(s)
Expect(err).ToNot(HaveOccurred())
Expect(n).To(Equal(3))
close(done)
}()
waitForWrite()
frame, _ := str.popStreamFrame(frameHeaderSize + 1)
Expect(frame.Data).To(Equal([]byte("f")))
s[1] = 'e'
f, _ := str.popStreamFrame(100)
Expect(f).ToNot(BeNil())
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())
str.Close()
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,
DataLimit: 12,
})
mockSender.EXPECT().onHasStreamData(streamID)
done := make(chan struct{})
go func() {
defer GinkgoRecover()
_, err := str.Write([]byte("foobar"))
Expect(err).ToNot(HaveOccurred())
close(done)
}()
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() {
frameHeaderSize := protocol.ByteCount(4)
mockSender.EXPECT().onHasStreamData(streamID)
done := make(chan struct{})
go func() {
defer GinkgoRecover()
_, err := str.Write([]byte("foobar"))
Expect(err).ToNot(HaveOccurred())
close(done)
}()
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(frameHeaderSize + 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,
DataLimit: 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([]byte("foobar"))
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([]byte("foobar"))
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() {
mockSender.EXPECT().onHasStreamData(streamID)
mockFC.EXPECT().SendWindowSize().Return(protocol.ByteCount(10000)).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()
var err error
n, err = strWithTimeout.Write(bytes.Repeat([]byte{0}, 100))
Expect(err).To(MatchError(errDeadline))
Expect(time.Now()).To(BeTemporally("~", deadline, scaleDuration(20*time.Millisecond)))
close(writeReturned)
}()
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.DataLen()))
})
It("doesn't pop any data after the deadline expired", func() {
mockSender.EXPECT().onHasStreamData(streamID)
mockFC.EXPECT().SendWindowSize().Return(protocol.ByteCount(10000)).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()
_, err := strWithTimeout.Write(bytes.Repeat([]byte{0}, 100))
Expect(err).To(MatchError(errDeadline))
close(writeReturned)
}()
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([]byte("foobar"))
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([]byte("foobar"))
Expect(err).To(MatchError(errDeadline))
Expect(time.Now()).To(BeTemporally("~", deadline2, scaleDuration(20*time.Millisecond)))
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)
mockSender.EXPECT().onStreamCompleted(streamID)
str.Close()
f, hasMoreData := str.popStreamFrame(1000)
Expect(f).ToNot(BeNil())
Expect(f.Data).To(BeEmpty())
Expect(f.FinBit).To(BeTrue())
Expect(hasMoreData).To(BeFalse())
})
It("doesn't send a FIN when there's still data", func() {
mockSender.EXPECT().onHasStreamData(streamID)
frameHeaderLen := protocol.ByteCount(4)
mockFC.EXPECT().SendWindowSize().Return(protocol.ByteCount(9999)).Times(2)
mockFC.EXPECT().AddBytesSent(gomock.Any()).Times(2)
str.dataForWriting = []byte("foobar")
Expect(str.Close()).To(Succeed())
f, _ := str.popStreamFrame(3 + frameHeaderLen)
Expect(f).ToNot(BeNil())
Expect(f.Data).To(Equal([]byte("foo")))
Expect(f.FinBit).To(BeFalse())
mockSender.EXPECT().onStreamCompleted(streamID)
f, _ = str.popStreamFrame(100)
Expect(f.Data).To(Equal([]byte("bar")))
Expect(f.FinBit).To(BeTrue())
})
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())
})
It("doesn't allow FIN twice", func() {
mockSender.EXPECT().onHasStreamData(streamID)
mockSender.EXPECT().onStreamCompleted(streamID)
str.Close()
f, _ := str.popStreamFrame(1000)
Expect(f).ToNot(BeNil())
Expect(f.Data).To(BeEmpty())
Expect(f.FinBit).To(BeTrue())
f, hasMoreData := str.popStreamFrame(1000)
Expect(f).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() {
mockSender.EXPECT().onHasStreamData(streamID)
mockFC.EXPECT().SendWindowSize().Return(protocol.ByteCount(9999))
mockFC.EXPECT().AddBytesSent(gomock.Any())
done := make(chan struct{})
go func() {
defer GinkgoRecover()
_, err := strWithTimeout.Write(bytes.Repeat([]byte{0}, 500))
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.handleMaxStreamDataFrame(&wire.MaxStreamDataFrame{
StreamID: streamID,
ByteOffset: 0x1337,
})
})
It("says when it has data for sending", func() {
mockFC.EXPECT().UpdateSendWindow(gomock.Any())
mockSender.EXPECT().onHasStreamData(streamID).Times(2) // once for Write, once for the MAX_STREAM_DATA frame
done := make(chan struct{})
go func() {
defer GinkgoRecover()
_, err := str.Write([]byte("foobar"))
Expect(err).ToNot(HaveOccurred())
close(done)
}()
waitForWrite()
str.handleMaxStreamDataFrame(&wire.MaxStreamDataFrame{
StreamID: streamID,
ByteOffset: 42,
})
// make sure the Write go routine returns
str.closeForShutdown(nil)
Eventually(done).Should(BeClosed())
})
})
Context("stream cancelations", func() {
Context("canceling writing", func() {
It("queues a RESET_STREAM frame", func() {
mockSender.EXPECT().queueControlFrame(&wire.ResetStreamFrame{
StreamID: streamID,
ByteOffset: 1234,
ErrorCode: 9876,
})
mockSender.EXPECT().onStreamCompleted(streamID)
str.writeOffset = 1234
err := str.CancelWrite(9876)
Expect(err).ToNot(HaveOccurred())
})
It("unblocks Write", func() {
mockSender.EXPECT().onHasStreamData(streamID)
mockSender.EXPECT().onStreamCompleted(streamID)
mockSender.EXPECT().queueControlFrame(gomock.Any())
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(bytes.Repeat([]byte{0}, 100))
Expect(err).To(MatchError("Write on stream 1337 canceled with error code 1234"))
close(writeReturned)
}()
waitForWrite()
frame, _ := str.popStreamFrame(50)
Expect(frame).ToNot(BeNil())
err := str.CancelWrite(1234)
Expect(err).ToNot(HaveOccurred())
Eventually(writeReturned).Should(BeClosed())
Expect(n).To(BeEquivalentTo(frame.DataLen()))
})
It("cancels the context", func() {
mockSender.EXPECT().queueControlFrame(gomock.Any())
mockSender.EXPECT().onStreamCompleted(streamID)
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(streamID)
err := str.CancelWrite(1234)
Expect(err).ToNot(HaveOccurred())
_, 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(gomock.Any())
mockSender.EXPECT().onStreamCompleted(streamID)
err := str.CancelWrite(1234)
Expect(err).ToNot(HaveOccurred())
err = str.CancelWrite(4321)
Expect(err).ToNot(HaveOccurred())
})
It("doesn't cancel when the stream was already closed", func() {
mockSender.EXPECT().onHasStreamData(streamID)
err := str.Close()
Expect(err).ToNot(HaveOccurred())
err = str.CancelWrite(123)
Expect(err).To(MatchError("CancelWrite for closed stream 1337"))
})
})
Context("receiving STOP_SENDING frames", func() {
It("queues a RESET_STREAM frames with error code Stopping", func() {
mockSender.EXPECT().queueControlFrame(&wire.ResetStreamFrame{
StreamID: streamID,
ErrorCode: errorCodeStopping,
})
mockSender.EXPECT().onStreamCompleted(streamID)
str.handleStopSendingFrame(&wire.StopSendingFrame{
StreamID: streamID,
ErrorCode: 101,
})
})
It("unblocks Write", func() {
mockSender.EXPECT().onHasStreamData(streamID)
mockSender.EXPECT().queueControlFrame(gomock.Any())
done := make(chan struct{})
go func() {
defer GinkgoRecover()
_, err := str.Write([]byte("foobar"))
Expect(err).To(MatchError("Stream 1337 was reset with error code 123"))
Expect(err).To(BeAssignableToTypeOf(streamCanceledError{}))
Expect(err.(streamCanceledError).Canceled()).To(BeTrue())
Expect(err.(streamCanceledError).ErrorCode()).To(Equal(protocol.ApplicationErrorCode(123)))
close(done)
}()
waitForWrite()
mockSender.EXPECT().onStreamCompleted(streamID)
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(streamID)
str.handleStopSendingFrame(&wire.StopSendingFrame{
StreamID: streamID,
ErrorCode: 123,
})
_, err := str.Write([]byte("foobar"))
Expect(err).To(MatchError("Stream 1337 was reset with error code 123"))
Expect(err).To(BeAssignableToTypeOf(streamCanceledError{}))
Expect(err.(streamCanceledError).Canceled()).To(BeTrue())
Expect(err.(streamCanceledError).ErrorCode()).To(Equal(protocol.ApplicationErrorCode(123)))
})
})
})
})