| // |
| // |
| // Copyright 2018 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 "src/cpp/ext/filters/census/server_call_tracer.h" |
| |
| #include <stdint.h> |
| #include <string.h> |
| |
| #include <algorithm> |
| #include <initializer_list> |
| #include <string> |
| #include <utility> |
| #include <vector> |
| |
| #include "absl/meta/type_traits.h" |
| #include "absl/strings/str_cat.h" |
| #include "absl/strings/str_format.h" |
| #include "absl/strings/string_view.h" |
| #include "absl/time/clock.h" |
| #include "absl/time/time.h" |
| #include "absl/types/optional.h" |
| #include "opencensus/stats/stats.h" |
| #include "opencensus/tags/tag_key.h" |
| #include "opencensus/tags/tag_map.h" |
| #include "opencensus/trace/span.h" |
| #include "opencensus/trace/span_context.h" |
| #include "opencensus/trace/span_id.h" |
| #include "opencensus/trace/trace_id.h" |
| |
| #include <grpcpp/opencensus.h> |
| |
| #include "src/core/lib/channel/call_tracer.h" |
| #include "src/core/lib/channel/channel_stack.h" |
| #include "src/core/lib/channel/context.h" |
| #include "src/core/lib/iomgr/error.h" |
| #include "src/core/lib/promise/context.h" |
| #include "src/core/lib/resource_quota/arena.h" |
| #include "src/core/lib/slice/slice.h" |
| #include "src/core/lib/slice/slice_buffer.h" |
| #include "src/core/lib/transport/metadata_batch.h" |
| #include "src/cpp/ext/filters/census/context.h" |
| #include "src/cpp/ext/filters/census/grpc_plugin.h" |
| #include "src/cpp/ext/filters/census/measures.h" |
| |
| namespace grpc { |
| namespace internal { |
| |
| namespace { |
| |
| // server metadata elements |
| struct ServerMetadataElements { |
| grpc_core::Slice path; |
| grpc_core::Slice tracing_slice; |
| grpc_core::Slice census_proto; |
| }; |
| |
| void FilterInitialMetadata(grpc_metadata_batch* b, |
| ServerMetadataElements* sml) { |
| const auto* path = b->get_pointer(grpc_core::HttpPathMetadata()); |
| if (path != nullptr) { |
| sml->path = path->Ref(); |
| } |
| if (OpenCensusTracingEnabled()) { |
| auto grpc_trace_bin = b->Take(grpc_core::GrpcTraceBinMetadata()); |
| if (grpc_trace_bin.has_value()) { |
| sml->tracing_slice = std::move(*grpc_trace_bin); |
| } |
| } |
| if (OpenCensusStatsEnabled()) { |
| auto grpc_tags_bin = b->Take(grpc_core::GrpcTagsBinMetadata()); |
| if (grpc_tags_bin.has_value()) { |
| sml->census_proto = std::move(*grpc_tags_bin); |
| } |
| } |
| } |
| |
| } // namespace |
| |
| // OpenCensusServerCallTracer implementation |
| |
| class OpenCensusServerCallTracer : public grpc_core::ServerCallTracer { |
| public: |
| // Maximum size of server stats that are sent on the wire. |
| static constexpr uint32_t kMaxServerStatsLen = 16; |
| |
| OpenCensusServerCallTracer() |
| : start_time_(absl::Now()), |
| recv_message_count_(0), |
| sent_message_count_(0) {} |
| |
| std::string TraceId() override { |
| return context_.Context().trace_id().ToHex(); |
| } |
| |
| std::string SpanId() override { return context_.Context().span_id().ToHex(); } |
| |
| bool IsSampled() override { return context_.Span().IsSampled(); } |
| |
| // Please refer to `grpc_transport_stream_op_batch_payload` for details on |
| // arguments. |
| void RecordSendInitialMetadata( |
| grpc_metadata_batch* /*send_initial_metadata*/) override {} |
| |
| void RecordSendTrailingMetadata( |
| grpc_metadata_batch* send_trailing_metadata) override; |
| |
| void RecordSendMessage(const grpc_core::SliceBuffer& send_message) override { |
| RecordAnnotation( |
| absl::StrFormat("Send message: %ld bytes", send_message.Length())); |
| ++sent_message_count_; |
| } |
| void RecordSendCompressedMessage( |
| const grpc_core::SliceBuffer& send_compressed_message) override { |
| RecordAnnotation(absl::StrFormat("Send compressed message: %ld bytes", |
| send_compressed_message.Length())); |
| } |
| |
| void RecordReceivedInitialMetadata( |
| grpc_metadata_batch* recv_initial_metadata) override; |
| |
| void RecordReceivedMessage( |
| const grpc_core::SliceBuffer& recv_message) override { |
| RecordAnnotation( |
| absl::StrFormat("Received message: %ld bytes", recv_message.Length())); |
| ++recv_message_count_; |
| } |
| void RecordReceivedDecompressedMessage( |
| const grpc_core::SliceBuffer& recv_decompressed_message) override { |
| RecordAnnotation(absl::StrFormat("Received decompressed message: %ld bytes", |
| recv_decompressed_message.Length())); |
| } |
| |
| void RecordReceivedTrailingMetadata( |
| grpc_metadata_batch* /*recv_trailing_metadata*/) override {} |
| |
| void RecordCancel(grpc_error_handle /*cancel_error*/) override { |
| elapsed_time_ = absl::Now() - start_time_; |
| } |
| |
| void RecordEnd(const grpc_call_final_info* final_info) override; |
| |
| void RecordAnnotation(absl::string_view annotation) override { |
| context_.AddSpanAnnotation(annotation, {}); |
| } |
| |
| private: |
| experimental::CensusContext context_; |
| // server method |
| grpc_core::Slice path_; |
| absl::string_view method_; |
| // recv message |
| absl::Time start_time_; |
| absl::Duration elapsed_time_; |
| uint64_t recv_message_count_; |
| uint64_t sent_message_count_; |
| // Buffer needed for grpc_slice to reference it when adding metatdata to |
| // response. |
| char stats_buf_[kMaxServerStatsLen]; |
| }; |
| |
| void OpenCensusServerCallTracer::RecordReceivedInitialMetadata( |
| grpc_metadata_batch* recv_initial_metadata) { |
| ServerMetadataElements sml; |
| FilterInitialMetadata(recv_initial_metadata, &sml); |
| path_ = std::move(sml.path); |
| method_ = GetMethod(path_); |
| auto tracing_enabled = OpenCensusTracingEnabled(); |
| GenerateServerContext( |
| tracing_enabled ? sml.tracing_slice.as_string_view() : "", |
| absl::StrCat("Recv.", method_), &context_); |
| if (tracing_enabled) { |
| auto* call_context = grpc_core::GetContext<grpc_call_context_element>(); |
| call_context[GRPC_CONTEXT_TRACING].value = &context_; |
| } |
| if (OpenCensusStatsEnabled()) { |
| std::vector<std::pair<opencensus::tags::TagKey, std::string>> tags = |
| context_.tags().tags(); |
| tags.emplace_back(ServerMethodTagKey(), std::string(method_)); |
| ::opencensus::stats::Record({{RpcServerStartedRpcs(), 1}}, tags); |
| } |
| } |
| |
| void OpenCensusServerCallTracer::RecordSendTrailingMetadata( |
| grpc_metadata_batch* send_trailing_metadata) { |
| // We need to record the time when the trailing metadata was sent to |
| // mark the completeness of the request. |
| elapsed_time_ = absl::Now() - start_time_; |
| if (OpenCensusStatsEnabled() && send_trailing_metadata != nullptr) { |
| size_t len = ServerStatsSerialize(absl::ToInt64Nanoseconds(elapsed_time_), |
| stats_buf_, kMaxServerStatsLen); |
| if (len > 0) { |
| send_trailing_metadata->Set( |
| grpc_core::GrpcServerStatsBinMetadata(), |
| grpc_core::Slice::FromCopiedBuffer(stats_buf_, len)); |
| } |
| } |
| } |
| |
| void OpenCensusServerCallTracer::RecordEnd( |
| const grpc_call_final_info* final_info) { |
| if (OpenCensusStatsEnabled()) { |
| const uint64_t request_size = GetOutgoingDataSize(final_info); |
| const uint64_t response_size = GetIncomingDataSize(final_info); |
| double elapsed_time_ms = absl::ToDoubleMilliseconds(elapsed_time_); |
| std::vector<std::pair<opencensus::tags::TagKey, std::string>> tags = |
| context_.tags().tags(); |
| tags.emplace_back(ServerMethodTagKey(), std::string(method_)); |
| tags.emplace_back( |
| ServerStatusTagKey(), |
| std::string(StatusCodeToString(final_info->final_status))); |
| ::opencensus::stats::Record( |
| {{RpcServerSentBytesPerRpc(), static_cast<double>(response_size)}, |
| {RpcServerReceivedBytesPerRpc(), static_cast<double>(request_size)}, |
| {RpcServerServerLatency(), elapsed_time_ms}, |
| {RpcServerSentMessagesPerRpc(), sent_message_count_}, |
| {RpcServerReceivedMessagesPerRpc(), recv_message_count_}}, |
| tags); |
| } |
| if (OpenCensusTracingEnabled()) { |
| context_.EndSpan(); |
| } |
| } |
| |
| // |
| // OpenCensusServerCallTracerFactory |
| // |
| |
| grpc_core::ServerCallTracer* |
| OpenCensusServerCallTracerFactory::CreateNewServerCallTracer( |
| grpc_core::Arena* arena) { |
| return arena->ManagedNew<OpenCensusServerCallTracer>(); |
| } |
| |
| } // namespace internal |
| } // namespace grpc |