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http: allow any FilterHeaderStatus::Stop* after sending a local reply. #15496

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merged 6 commits into from
Mar 24, 2021
Merged

http: allow any FilterHeaderStatus::Stop* after sending a local reply. #15496

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6d1e6a0
http: allow any FilterHeaderStatus::Stop* after sending a local reply.
PiotrSikora Mar 15, 2021
a779c3c
Merge remote-tracking branch 'origin/main' into PiotrSikora/fix_stop_…
PiotrSikora Mar 22, 2021
71fba33
review: address comments from Asra.
PiotrSikora Mar 22, 2021
0062c85
reviwe: reorder to fix metadata processing.
PiotrSikora Mar 23, 2021
6b9bf28
Merge remote-tracking branch 'origin/main' into PiotrSikora/fix_stop_…
PiotrSikora Mar 24, 2021
be883a1
review: add test with headers and body.
PiotrSikora Mar 24, 2021
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11 changes: 5 additions & 6 deletions source/common/http/filter_manager.cc
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Original file line number Diff line number Diff line change
Expand Up @@ -507,18 +507,16 @@ void FilterManager::decodeHeaders(ActiveStreamDecoderFilter* filter, RequestHead
ASSERT(!(status == FilterHeadersStatus::ContinueAndDontEndStream && !(*entry)->end_stream_),
"Filters should not return FilterHeadersStatus::ContinueAndDontEndStream from "
"decodeHeaders when end_stream is already false");
ENVOY_BUG(
!state_.local_complete_ || status == FilterHeadersStatus::StopIteration,
"Filters should return FilterHeadersStatus::StopIteration after sending a local reply.");

state_.filter_call_state_ &= ~FilterCallState::DecodeHeaders;
ENVOY_STREAM_LOG(trace, "decode headers called: filter={} status={}", *this,
static_cast<const void*>((*entry).get()), static_cast<uint64_t>(status));

(*entry)->decode_headers_called_ = true;

const auto continue_iteration =
(*entry)->commonHandleAfterHeadersCallback(status, end_stream) && !state_.local_complete_;
const auto continue_iteration = (*entry)->commonHandleAfterHeadersCallback(status, end_stream);
ENVOY_BUG(!continue_iteration || !state_.local_complete_,
"Filter did not return StopAll or StopIteration after sending a local reply.");

// If this filter ended the stream, decodeComplete() should be called for it.
if ((*entry)->end_stream_) {
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Do we really want to do any of this work (handle new metadata, add decoded data, etc).
Would it make more sense to early return or does that break something else?

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I honestly don't know the codebase well enough to answer that. Commenting out maybeContinueDecoding() below breaks a bunch of tests, but I don't know if those are real failures or tests that are not representative of the production code.

In any case, I don't think such risky change should be a part of this bugfix PR.

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given it's unlikely folks will be doing sendLocalReply and add decoded data / metadata I buy that as an argument.

Would you instead either throw a TODO my way or, if you want to avoid another round of CI, open a tracking issue to look into it?

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Let's skip the 3h wait on the CI, I filled #15654.

Expand All @@ -538,7 +536,8 @@ void FilterManager::decodeHeaders(ActiveStreamDecoderFilter* filter, RequestHead
addDecodedData(*((*entry).get()), empty_data, true);
}

if (!continue_iteration && std::next(entry) != decoder_filters_.end()) {
if ((!continue_iteration || state_.local_complete_) &&
std::next(entry) != decoder_filters_.end()) {
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// Stop iteration IFF this is not the last filter. If it is the last filter, continue with
// processing since we need to handle the case where a terminal filter wants to buffer, but
// a previous filter has added body.
Expand Down
27 changes: 24 additions & 3 deletions test/integration/protocol_integration_test.cc
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Expand Up @@ -282,9 +282,8 @@ TEST_P(DownstreamProtocolIntegrationTest, ContinueAfterLocalReply) {
EXPECT_TRUE(response->complete());
EXPECT_EQ("200", response->headers().getStatusValue());
},
"envoy bug failure: !state_.local_complete_ || status == "
"FilterHeadersStatus::StopIteration. Details: Filters should return "
"FilterHeadersStatus::StopIteration after sending a local reply.");
"envoy bug failure: !continue_iteration || !state_.local_complete_. "
"Details: Filter did not return StopAll or StopIteration after sending a local reply.");
}

TEST_P(ProtocolIntegrationTest, AddEncodedTrailers) {
Expand Down Expand Up @@ -423,6 +422,28 @@ TEST_P(DownstreamProtocolIntegrationTest, MissingHeadersLocalReply) {
EXPECT_THAT(waitForAccessLog(access_log_name_), HasSubstr("InvalidHeaderFilter_ready\n"));
}

TEST_P(DownstreamProtocolIntegrationTest, MissingHeadersLocalReplyWithBody) {
useAccessLog("%RESPONSE_CODE_DETAILS%");
config_helper_.addFilter("{ name: invalid-header-filter, typed_config: { \"@type\": "
"type.googleapis.com/google.protobuf.Empty } }");
initialize();
codec_client_ = makeHttpConnection(lookupPort("http"));

// Missing method
auto response =
codec_client_->makeRequestWithBody(Http::TestRequestHeaderMapImpl{{":method", "GET"},
{":path", "/test/long/url"},
{":scheme", "http"},
{":authority", "host"},
{"remove-method", "yes"},
{"send-reply", "yes"}},
1024);
response->waitForEndStream();
EXPECT_TRUE(response->complete());
EXPECT_EQ("200", response->headers().getStatusValue());
EXPECT_THAT(waitForAccessLog(access_log_name_), HasSubstr("InvalidHeaderFilter_ready\n"));
}

// Regression test for https://github.com/envoyproxy/envoy/issues/10270
TEST_P(ProtocolIntegrationTest, LongHeaderValueWithSpaces) {
// Header with at least 20kb of spaces surrounded by non-whitespace characters to ensure that
Expand Down