| // |
| // |
| // Copyright 2021 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. |
| // |
| // |
| |
| #ifndef GRPC_INTERNAL_CPP_EXT_FILTERS_OPEN_CENSUS_CALL_TRACER_H |
| #define GRPC_INTERNAL_CPP_EXT_FILTERS_OPEN_CENSUS_CALL_TRACER_H |
| |
| #include <grpc/support/port_platform.h> |
| |
| #include <stdint.h> |
| |
| #include "absl/base/thread_annotations.h" |
| #include "absl/status/status.h" |
| #include "absl/strings/string_view.h" |
| #include "absl/time/time.h" |
| |
| #include <grpc/support/atm.h> |
| #include <grpc/support/time.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/gprpp/sync.h" |
| #include "src/core/lib/iomgr/error.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/core/lib/transport/transport.h" |
| |
| // TODO(yashykt): This might not be the right place for this channel arg, but we |
| // don't have a better place for this right now. |
| |
| // EXPERIMENTAL. If zero, disables observability tracing and observability |
| // logging (not yet implemented) on the client channel, defaults to true. Note |
| // that this does not impact metrics/stats collection. This channel arg is |
| // intended as a way to avoid cyclic execution of observability logging and |
| // trace especially when the sampling rate of RPCs is very high which would |
| // generate a lot of data. |
| // |
| #define GRPC_ARG_ENABLE_OBSERVABILITY "grpc.experimental.enable_observability" |
| |
| namespace grpc { |
| namespace internal { |
| |
| class OpenCensusCallTracer : public grpc_core::CallTracer { |
| public: |
| class OpenCensusCallAttemptTracer : public CallAttemptTracer { |
| public: |
| OpenCensusCallAttemptTracer(OpenCensusCallTracer* parent, |
| uint64_t attempt_num, bool is_transparent_retry, |
| bool arena_allocated); |
| void RecordSendInitialMetadata( |
| grpc_metadata_batch* send_initial_metadata) override; |
| void RecordOnDoneSendInitialMetadata(gpr_atm* /*peer_string*/) override {} |
| void RecordSendTrailingMetadata( |
| grpc_metadata_batch* /*send_trailing_metadata*/) override {} |
| void RecordSendMessage( |
| const grpc_core::SliceBuffer& /*send_message*/) override; |
| void RecordReceivedInitialMetadata( |
| grpc_metadata_batch* /*recv_initial_metadata*/, |
| uint32_t /*flags*/) override {} |
| void RecordReceivedMessage( |
| const grpc_core::SliceBuffer& /*recv_message*/) override; |
| void RecordReceivedTrailingMetadata( |
| absl::Status status, grpc_metadata_batch* recv_trailing_metadata, |
| const grpc_transport_stream_stats* transport_stream_stats) override; |
| void RecordCancel(grpc_error_handle cancel_error) override; |
| void RecordEnd(const gpr_timespec& /*latency*/) override; |
| void RecordAnnotation(absl::string_view annotation) override; |
| |
| experimental::CensusContext* context() { return &context_; } |
| |
| private: |
| // Maximum size of trace context is sent on the wire. |
| static constexpr uint32_t kMaxTraceContextLen = 64; |
| // Maximum size of tags that are sent on the wire. |
| static constexpr uint32_t kMaxTagsLen = 2048; |
| OpenCensusCallTracer* parent_; |
| const bool arena_allocated_; |
| experimental::CensusContext context_; |
| // Start time (for measuring latency). |
| absl::Time start_time_; |
| // Number of messages in this RPC. |
| uint64_t recv_message_count_ = 0; |
| uint64_t sent_message_count_ = 0; |
| // End status code |
| absl::StatusCode status_code_; |
| }; |
| |
| explicit OpenCensusCallTracer(const grpc_call_element_args* args, |
| bool tracing_enabled); |
| ~OpenCensusCallTracer() override; |
| |
| void GenerateContext(); |
| OpenCensusCallAttemptTracer* StartNewAttempt( |
| bool is_transparent_retry) override; |
| void RecordAnnotation(absl::string_view annotation) override; |
| |
| private: |
| experimental::CensusContext CreateCensusContextForCallAttempt(); |
| |
| const grpc_call_context_element* call_context_; |
| // Client method. |
| grpc_core::Slice path_; |
| absl::string_view method_; |
| experimental::CensusContext context_; |
| grpc_core::Arena* arena_; |
| bool tracing_enabled_; |
| grpc_core::Mutex mu_; |
| // Non-transparent attempts per call |
| uint64_t retries_ ABSL_GUARDED_BY(&mu_) = 0; |
| // Transparent retries per call |
| uint64_t transparent_retries_ ABSL_GUARDED_BY(&mu_) = 0; |
| // Retry delay |
| absl::Duration retry_delay_ ABSL_GUARDED_BY(&mu_); |
| absl::Time time_at_last_attempt_end_ ABSL_GUARDED_BY(&mu_); |
| uint64_t num_active_rpcs_ ABSL_GUARDED_BY(&mu_) = 0; |
| }; |
| |
| } // namespace internal |
| } // namespace grpc |
| |
| #endif // GRPC_INTERNAL_CPP_EXT_FILTERS_OPEN_CENSUS_CALL_TRACER_H |