Skip to content
New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Jump to bottom

http/2: fix deferred reset behavior #1145

Merged
merged 3 commits into from
Jun 20, 2017
Merged

http/2: fix deferred reset behavior #1145

Show file tree
Hide file tree
Changes from all commits
Commits
Show all changes
3 commits
Select commit Hold shift + click to select a range
cae252a
http/2: fix deferred reset behavior
mattklein123 Jun 19, 2017
ef26f92
Merge remote-tracking branch 'origin/master' into fix_h2_crash
mattklein123 Jun 20, 2017
9236e69
comments
mattklein123 Jun 20, 2017
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
7 changes: 6 additions & 1 deletion source/common/http/http2/codec_impl.cc
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -206,10 +206,15 @@ void ConnectionImpl::StreamImpl::resetStream(StreamResetReason reason) {
if (local_end_stream_ && !local_end_stream_sent_) {
parent_.pending_deferred_reset_ = true;
deferred_reset_.value(reason);
ENVOY_CONN_LOG(trace, "deferred reset stream", parent_.connection_);
} else {
resetStreamWorker(reason);
parent_.sendPendingFrames();
}

// We must still call sendPendingFrames() in both the deferred and not deferred path. This forces
// the cleanup logic to run which will reset the stream in all cases if all data frames could not
// be sent.
parent_.sendPendingFrames();
Copy link
Member

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

Could we made the "pending deferred reset" a parameter to sendPendingFrames() now? It seems like pending_deferred_reset_ is acting as effectively a parameter for the pending case behavior, sendPendingFrames() is the only consumer.

Copy link
Member Author

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

Unfortunately we can't, because sendPendingFrames() will return immediately if we are currently dispatching read data (interleaving read/write is not possible w/ nghttp2). So we still need the flag for the currently dispatching case.

}

void ConnectionImpl::StreamImpl::resetStreamWorker(StreamResetReason reason) {
Expand Down
90 changes: 72 additions & 18 deletions test/common/http/http2/codec_impl_test.cc
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -15,14 +15,14 @@
#include "gmock/gmock.h"
#include "gtest/gtest.h"

namespace Envoy {

using testing::_;
using testing::AtLeast;
using testing::InSequence;
using testing::Invoke;
using testing::InvokeWithoutArgs;
using testing::NiceMock;

namespace Envoy {
namespace Http {
namespace Http2 {

Expand Down Expand Up @@ -69,7 +69,7 @@ class Http2CodecImplTest : public testing::TestWithParam<Http2SettingsTestParam>
EXPECT_CALL(server_callbacks_, newStream(_))
.WillOnce(Invoke([&](StreamEncoder& encoder) -> StreamDecoder& {
response_encoder_ = &encoder;
encoder.getStream().addCallbacks(callbacks_);
encoder.getStream().addCallbacks(server_stream_callbacks_);
return request_decoder_;
}));
}
Expand Down Expand Up @@ -98,7 +98,7 @@ class Http2CodecImplTest : public testing::TestWithParam<Http2SettingsTestParam>
StreamEncoder& request_encoder_;
MockStreamDecoder request_decoder_;
StreamEncoder* response_encoder_{};
MockStreamCallbacks callbacks_;
MockStreamCallbacks server_stream_callbacks_;
};

TEST_P(Http2CodecImplTest, ExpectContinueHeadersOnlyResponse) {
Expand Down Expand Up @@ -168,7 +168,7 @@ TEST_P(Http2CodecImplTest, RefusedStreamReset) {

MockStreamCallbacks callbacks;
request_encoder_.getStream().addCallbacks(callbacks);
EXPECT_CALL(callbacks_, onResetStream(StreamResetReason::LocalRefusedStreamReset));
EXPECT_CALL(server_stream_callbacks_, onResetStream(StreamResetReason::LocalRefusedStreamReset));
EXPECT_CALL(callbacks, onResetStream(StreamResetReason::RemoteRefusedStreamReset));
response_encoder_->getStream().resetStream(StreamResetReason::LocalRefusedStreamReset);
}
Expand Down Expand Up @@ -232,42 +232,96 @@ TEST_P(Http2CodecImplTest, TrailingHeadersLargeBody) {
response_encoder_->encodeTrailers(TestHeaderMapImpl{{"trailing", "header"}});
}

TEST_P(Http2CodecImplTest, DeferredReset) {
class Http2CodecImplDeferredResetTest : public Http2CodecImplTest {};

TEST_P(Http2CodecImplDeferredResetTest, DeferredResetClient) {
InSequence s;

// Buffer server data so we can make sure we don't get any window updates.
MockStreamCallbacks client_stream_callbacks;
request_encoder_.getStream().addCallbacks(client_stream_callbacks);

// Do a request, but pause server dispatch so we don't send window updates. This will result in a
// deferred reset, followed by a pending frames flush which will cause the stream to actually
// be reset immediately since we are outside of dispatch context.
ON_CALL(client_connection_, write(_))
.WillByDefault(
Invoke([&](Buffer::Instance& data) -> void { server_wrapper_.buffer_.add(data); }));

// This will send a request that is bigger than the initial window size. When we then reset it,
// after attempting to flush we should reset the stream and drop the data we could not send.
TestHeaderMapImpl request_headers;
HttpTestUtility::addDefaultHeaders(request_headers);
request_encoder_.encodeHeaders(request_headers, false);
Buffer::OwnedImpl body(std::string(1024 * 1024, 'a'));
request_encoder_.encodeData(body, true);
EXPECT_CALL(client_stream_callbacks, onResetStream(StreamResetReason::LocalReset));
request_encoder_.getStream().resetStream(StreamResetReason::LocalReset);

EXPECT_CALL(request_decoder_, decodeHeaders_(_, false));
// Dispatch server. We expect to see some data.
EXPECT_CALL(response_decoder_, decodeHeaders_(_, _)).Times(0);
EXPECT_CALL(request_decoder_, decodeHeaders_(_, false))
.WillOnce(InvokeWithoutArgs([&]() -> void {
// Start a response inside the headers callback. This should not result in the client
// seeing any headers as the stream should already be reset on the other side, even though
// we don't know about it yet.
TestHeaderMapImpl response_headers{{":status", "200"}};
response_encoder_->encodeHeaders(response_headers, false);
}));
EXPECT_CALL(request_decoder_, decodeData(_, false)).Times(AtLeast(1));
EXPECT_CALL(callbacks_, onResetStream(StreamResetReason::RemoteReset));
EXPECT_CALL(server_stream_callbacks_, onResetStream(StreamResetReason::RemoteReset));

setupDefaultConnectionMocks();
server_wrapper_.dispatch(Buffer::OwnedImpl(), server_);
}

// we seperate default/edge cases here to avoid combinatorial explosion
TEST_P(Http2CodecImplDeferredResetTest, DeferredResetServer) {
InSequence s;

#define HTTP2SETTINGS_DEFAULT_COMBIME \
TestHeaderMapImpl request_headers;
HttpTestUtility::addDefaultHeaders(request_headers);
EXPECT_CALL(request_decoder_, decodeHeaders_(_, false));
request_encoder_.encodeHeaders(request_headers, false);

// In this case we do the same thing as DeferredResetClient but on the server side.
ON_CALL(server_connection_, write(_))
.WillByDefault(
Invoke([&](Buffer::Instance& data) -> void { client_wrapper_.buffer_.add(data); }));
TestHeaderMapImpl response_headers{{":status", "200"}};
response_encoder_->encodeHeaders(response_headers, false);
Buffer::OwnedImpl body(std::string(1024 * 1024, 'a'));
response_encoder_->encodeData(body, true);
EXPECT_CALL(server_stream_callbacks_, onResetStream(StreamResetReason::LocalReset));
response_encoder_->getStream().resetStream(StreamResetReason::LocalReset);

MockStreamCallbacks client_stream_callbacks;
request_encoder_.getStream().addCallbacks(client_stream_callbacks);
EXPECT_CALL(response_decoder_, decodeHeaders_(_, false));
EXPECT_CALL(response_decoder_, decodeData(_, false)).Times(AtLeast(1));
EXPECT_CALL(client_stream_callbacks, onResetStream(StreamResetReason::RemoteReset));
setupDefaultConnectionMocks();
client_wrapper_.dispatch(Buffer::OwnedImpl(), client_);
}

// Deferred reset tests use only small windows so that we can test certain conditions.
#define HTTP2SETTINGS_DEFERRED_RESET_COMBINE \
::testing::Combine(::testing::Values(Http2Settings::DEFAULT_HPACK_TABLE_SIZE), \
::testing::Values(Http2Settings::DEFAULT_MAX_CONCURRENT_STREAMS), \
::testing::Values(Http2Settings::MIN_INITIAL_STREAM_WINDOW_SIZE), \
::testing::Values(Http2Settings::MIN_INITIAL_CONNECTION_WINDOW_SIZE))

INSTANTIATE_TEST_CASE_P(Http2CodecImplDeferredResetTest, Http2CodecImplDeferredResetTest,
::testing::Combine(HTTP2SETTINGS_DEFERRED_RESET_COMBINE,
HTTP2SETTINGS_DEFERRED_RESET_COMBINE));

// we seperate default/edge cases here to avoid combinatorial explosion
#define HTTP2SETTINGS_DEFAULT_COMBINE \
::testing::Combine(::testing::Values(Http2Settings::DEFAULT_HPACK_TABLE_SIZE), \
::testing::Values(Http2Settings::DEFAULT_MAX_CONCURRENT_STREAMS), \
::testing::Values(Http2Settings::DEFAULT_INITIAL_STREAM_WINDOW_SIZE), \
::testing::Values(Http2Settings::DEFAULT_INITIAL_CONNECTION_WINDOW_SIZE))

INSTANTIATE_TEST_CASE_P(Http2CodecImplTestDefaultSettings, Http2CodecImplTest,
::testing::Combine(HTTP2SETTINGS_DEFAULT_COMBIME,
HTTP2SETTINGS_DEFAULT_COMBIME));
::testing::Combine(HTTP2SETTINGS_DEFAULT_COMBINE,
HTTP2SETTINGS_DEFAULT_COMBINE));

#define HTTP2SETTINGS_EDGE_COMBIME \
#define HTTP2SETTINGS_EDGE_COMBINE \
::testing::Combine( \
::testing::Values(Http2Settings::MIN_HPACK_TABLE_SIZE, Http2Settings::MAX_HPACK_TABLE_SIZE), \
::testing::Values(Http2Settings::MIN_MAX_CONCURRENT_STREAMS, \
Expand All @@ -278,7 +332,7 @@ INSTANTIATE_TEST_CASE_P(Http2CodecImplTestDefaultSettings, Http2CodecImplTest,
Http2Settings::MAX_INITIAL_CONNECTION_WINDOW_SIZE))

INSTANTIATE_TEST_CASE_P(Http2CodecImplTestEdgeSettings, Http2CodecImplTest,
::testing::Combine(HTTP2SETTINGS_EDGE_COMBIME, HTTP2SETTINGS_EDGE_COMBIME));
::testing::Combine(HTTP2SETTINGS_EDGE_COMBINE, HTTP2SETTINGS_EDGE_COMBINE));

TEST(Http2CodecUtility, reconstituteCrumbledCookies) {
{
Expand Down