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Disallow non-consecutive duplicate byte event registrations

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Summary:
As per design, we are not supposed to honor duplicate byte event registrations. Duplicate is defined by a registration for the same <stream ID, stream offset, callback*> tuple twice.
Currently, there is a bug where-in we can register the same byte event a second time *if* there is another byte event for a higher offset that is registered in-between, for the same stream.
Example Sequence that triggers the bug:
1. Registration for Stream ID =10, offset = 50, callback = A. This will be successful.
2. Registration for Stream ID = 10, offset = 55, callback = <doesn't matter>. This will be successful.
3. Registration for Stream ID = 10, offset = 50, callback = A. This is a duplicate of #1. This *should not* be honored, but it was being honored (this was the bug).

This commit fixes the bug, #3 will return INVALID_OPERATION.

Reviewed By: bschlinker, lnicco

Differential Revision: D27946237

fbshipit-source-id: f9751ac90159284f86a285e5e0ebb23b83041d2a
This commit is contained in:
Sridhar Srinivasan
2021-04-26 11:23:46 -07:00
committed by Facebook GitHub Bot
parent 448643028e
commit 967b240bc9
2 changed files with 79 additions and 2 deletions
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9
quic/api/QuicTransportBase.cpp
View File

@@ -2110,8 +2110,13 @@ QuicTransportBase::registerByteEventCallback(
offset,
[&](uint64_t o, const ByteEventDetail& p) { return o < p.offset; });
if (pos != byteEventMapIt->second.begin()) {
auto prev = std::prev(pos);
if ((prev->offset == offset) && (prev->callback == cb)) {
auto matchingEvent = std::find_if(
byteEventMapIt->second.begin(),
pos,
[offset, cb](const ByteEventDetail& p) {
return ((p.offset == offset) && (p.callback == cb));
});
if (matchingEvent != pos) {
// ByteEvent has been already registered for the same type, id,
// offset and for the same recipient, return an INVALID_OPERATION error
// to prevent duplicate registrations.

72
quic/api/test/QuicTransportBaseTest.cpp
View File

@@ -1672,6 +1672,78 @@ TEST_F(
Mock::VerifyAndClearExpectations(&dcb);
}
TEST_F(QuicTransportImplTest, RegisterDeliveryCallbackMultipleRegistrationsTx) {
auto stream = transport->createBidirectionalStream().value();
StrictMock<MockByteEventCallback> txcb1;
StrictMock<MockByteEventCallback> txcb2;
// Set the current write offset to 7.
auto streamState = transport->transportConn->streamManager->getStream(stream);
streamState->currentWriteOffset = 7;
streamState->ackedIntervals.insert(0, 6);
// Have 2 different recipients register for a callback on the same stream ID
// and offset that is before the curernt write offset, they will both be
// scheduled for immediate delivery.
EXPECT_CALL(txcb1, onByteEventRegistered(getTxMatcher(stream, 3)));
EXPECT_CALL(txcb2, onByteEventRegistered(getTxMatcher(stream, 3)));
transport->registerTxCallback(stream, 3, &txcb1);
transport->registerTxCallback(stream, 3, &txcb2);
Mock::VerifyAndClearExpectations(&txcb1);
Mock::VerifyAndClearExpectations(&txcb2);
// Now, re-register the same callbacks, it should not go through.
auto ret = transport->registerTxCallback(stream, 3, &txcb1);
EXPECT_EQ(LocalErrorCode::INVALID_OPERATION, ret.error());
ret = transport->registerTxCallback(stream, 3, &txcb2);
EXPECT_EQ(LocalErrorCode::INVALID_OPERATION, ret.error());
// Deliver the first set of registrations.
EXPECT_CALL(txcb1, onByteEvent(getTxMatcher(stream, 3))).Times(1);
EXPECT_CALL(txcb2, onByteEvent(getTxMatcher(stream, 3))).Times(1);
evb->loopOnce();
Mock::VerifyAndClearExpectations(&txcb1);
Mock::VerifyAndClearExpectations(&txcb2);
}
TEST_F(
QuicTransportImplTest,
RegisterDeliveryCallbackMultipleRegistrationsAck) {
auto stream = transport->createBidirectionalStream().value();
StrictMock<MockByteEventCallback> txcb1;
StrictMock<MockByteEventCallback> txcb2;
// Set the current write offset to 7.
auto streamState = transport->transportConn->streamManager->getStream(stream);
streamState->currentWriteOffset = 7;
streamState->ackedIntervals.insert(0, 6);
// Have 2 different recipients register for a callback on the same stream ID
// and offset that is before the curernt write offset, they will both be
// scheduled for immediate delivery.
EXPECT_CALL(txcb1, onByteEventRegistered(getAckMatcher(stream, 3)));
EXPECT_CALL(txcb2, onByteEventRegistered(getAckMatcher(stream, 3)));
transport->registerByteEventCallback(ByteEvent::Type::ACK, stream, 3, &txcb1);
transport->registerByteEventCallback(ByteEvent::Type::ACK, stream, 3, &txcb2);
Mock::VerifyAndClearExpectations(&txcb1);
Mock::VerifyAndClearExpectations(&txcb2);
// Now, re-register the same callbacks, it should not go through.
auto ret = transport->registerByteEventCallback(
ByteEvent::Type::ACK, stream, 3, &txcb1);
EXPECT_EQ(LocalErrorCode::INVALID_OPERATION, ret.error());
ret = transport->registerByteEventCallback(
ByteEvent::Type::ACK, stream, 3, &txcb2);
EXPECT_EQ(LocalErrorCode::INVALID_OPERATION, ret.error());
// Deliver the first set of registrations.
EXPECT_CALL(txcb1, onByteEvent(getAckMatcher(stream, 3))).Times(1);
EXPECT_CALL(txcb2, onByteEvent(getAckMatcher(stream, 3))).Times(1);
evb->loopOnce();
Mock::VerifyAndClearExpectations(&txcb1);
Mock::VerifyAndClearExpectations(&txcb2);
}
TEST_F(QuicTransportImplTest, RegisterDeliveryCallbackMultipleRecipientsTx) {
auto stream = transport->createBidirectionalStream().value();
StrictMock<MockByteEventCallback> txcb1;