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//
// Copyright 2023 gRPC authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
#include <grpc/support/port_platform.h>
#include <functional>
#include <utility>
#include "absl/status/status.h"
#include "absl/status/statusor.h"
#include "src/core/lib/channel/call_finalization.h"
#include "src/core/lib/channel/call_tracer.h"
#include "src/core/lib/channel/channel_args.h"
#include "src/core/lib/channel/channel_fwd.h"
#include "src/core/lib/channel/channel_stack.h"
#include "src/core/lib/channel/channel_stack_builder.h"
#include "src/core/lib/channel/context.h"
#include "src/core/lib/channel/promise_based_filter.h"
#include "src/core/lib/config/core_configuration.h"
#include "src/core/lib/promise/arena_promise.h"
#include "src/core/lib/promise/cancel_callback.h"
#include "src/core/lib/promise/context.h"
#include "src/core/lib/promise/map.h"
#include "src/core/lib/promise/pipe.h"
#include "src/core/lib/promise/poll.h"
#include "src/core/lib/surface/channel_init.h"
#include "src/core/lib/surface/channel_stack_type.h"
#include "src/core/lib/transport/transport.h"
namespace grpc_core {
namespace {
// TODO(yashykt): This filter is not really needed. We should be able to move
// this to the connected filter.
class ServerCallTracerFilter : public ChannelFilter {
public:
static const grpc_channel_filter kFilter;
static absl::StatusOr<ServerCallTracerFilter> Create(
const ChannelArgs& /*args*/, ChannelFilter::Args /*filter_args*/);
ArenaPromise<ServerMetadataHandle> MakeCallPromise(
CallArgs call_args, NextPromiseFactory next_promise_factory) override;
};
const grpc_channel_filter ServerCallTracerFilter::kFilter =
MakePromiseBasedFilter<ServerCallTracerFilter, FilterEndpoint::kServer,
kFilterExaminesServerInitialMetadata>(
"server_call_tracer");
absl::StatusOr<ServerCallTracerFilter> ServerCallTracerFilter::Create(
const ChannelArgs& /*args*/, ChannelFilter::Args /*filter_args*/) {
return ServerCallTracerFilter();
}
ArenaPromise<ServerMetadataHandle> ServerCallTracerFilter::MakeCallPromise(
CallArgs call_args, NextPromiseFactory next_promise_factory) {
auto* call_context = GetContext<grpc_call_context_element>();
auto* call_tracer = static_cast<ServerCallTracer*>(
call_context[GRPC_CONTEXT_CALL_TRACER].value);
if (call_tracer == nullptr) {
return next_promise_factory(std::move(call_args));
}
call_tracer->RecordReceivedInitialMetadata(
call_args.client_initial_metadata.get());
call_args.server_initial_metadata->InterceptAndMap(
[call_tracer](ServerMetadataHandle metadata) {
call_tracer->RecordSendInitialMetadata(metadata.get());
return metadata;
});
GetContext<CallFinalization>()->Add(
[call_tracer](const grpc_call_final_info* final_info) {
call_tracer->RecordEnd(final_info);
});
return OnCancel(
Map(next_promise_factory(std::move(call_args)),
[call_tracer](ServerMetadataHandle md) {
call_tracer->RecordSendTrailingMetadata(md.get());
return md;
}),
[call_tracer]() { call_tracer->RecordCancel(absl::CancelledError()); });
}
} // namespace
void RegisterServerCallTracerFilter(CoreConfiguration::Builder* builder) {
builder->channel_init()->RegisterStage(
GRPC_SERVER_CHANNEL, GRPC_CHANNEL_INIT_BUILTIN_PRIORITY,
[](ChannelStackBuilder* builder) {
builder->AppendFilter(&ServerCallTracerFilter::kFilter);
return true;
});
}
} // namespace grpc_core
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