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reject inconsistent final stream offsets

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This commit is contained in:
Marten Seemann 2017-10-25 11:35:35 +07:00
parent 636bf4578c
commit d7a09e7667
2 changed files with 20 additions and 0 deletions
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5
internal/flowcontrol/stream_flow_controller.go
View file

@ -52,6 +52,11 @@ func (c *streamFlowController) UpdateHighestReceived(byteOffset protocol.ByteCou
c.mutex.Lock()
defer c.mutex.Unlock()
// when receiving a final offset, check that this final offset is consistent with a final offset we might have received earlier
if final && c.receivedFinalOffset && byteOffset != c.highestReceived {
return qerr.Error(qerr.StreamDataAfterTermination, fmt.Sprintf("Received inconsistent final offset for stream %d (old: %d, new: %d bytes)", c.streamID, c.highestReceived, byteOffset))
}
// if we already received a final offset, check that the offset in the STREAM frames is below the final offset
if c.receivedFinalOffset && byteOffset > c.highestReceived {
return qerr.StreamDataAfterTermination
}

15
internal/flowcontrol/stream_flow_controller_test.go
View file

@ -124,6 +124,21 @@ var _ = Describe("Stream Flow controller", func() {
err = controller.UpdateHighestReceived(250, false)
Expect(err).To(MatchError(qerr.StreamDataAfterTermination))
})
It("accepts duplicate final offsets", func() {
err := controller.UpdateHighestReceived(200, true)
Expect(err).ToNot(HaveOccurred())
err = controller.UpdateHighestReceived(200, true)
Expect(err).ToNot(HaveOccurred())
Expect(controller.highestReceived).To(Equal(protocol.ByteCount(200)))
})
It("errors when receiving inconsistent final offsets", func() {
err := controller.UpdateHighestReceived(200, true)
Expect(err).ToNot(HaveOccurred())
err = controller.UpdateHighestReceived(201, true)
Expect(err).To(MatchError("StreamDataAfterTermination: Received inconsistent final offset for stream 10 (old: 200, new: 201 bytes)"))
})
})
Context("registering data read", func() {