1 /* 2 * 3 * Copyright 2018 gRPC authors. 4 * 5 * Licensed under the Apache License, Version 2.0 (the "License"); 6 * you may not use this file except in compliance with the License. 7 * You may obtain a copy of the License at 8 * 9 * http://www.apache.org/licenses/LICENSE-2.0 10 * 11 * Unless required by applicable law or agreed to in writing, software 12 * distributed under the License is distributed on an "AS IS" BASIS, 13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 14 * See the License for the specific language governing permissions and 15 * limitations under the License. 16 * 17 */ 18 19 #ifndef GRPC_INTERNAL_CPP_EXT_FILTERS_CENSUS_SERVER_FILTER_H 20 #define GRPC_INTERNAL_CPP_EXT_FILTERS_CENSUS_SERVER_FILTER_H 21 22 #include <grpc/support/port_platform.h> 23 24 #include "absl/strings/string_view.h" 25 #include "absl/time/clock.h" 26 #include "absl/time/time.h" 27 #include "include/grpc/grpc_security.h" 28 #include "src/cpp/ext/filters/census/channel_filter.h" 29 #include "src/cpp/ext/filters/census/context.h" 30 31 namespace grpc { 32 33 // A CallData class will be created for every grpc call within a channel. It is 34 // used to store data and methods specific to that call. CensusServerCallData is 35 // thread-compatible, however typically only 1 thread should be interacting with 36 // a call at a time. 37 class CensusServerCallData : public CallData { 38 public: 39 // Maximum size of server stats that are sent on the wire. 40 static constexpr uint32_t kMaxServerStatsLen = 16; 41 CensusServerCallData()42 CensusServerCallData() 43 : gc_(nullptr), 44 auth_context_(nullptr), 45 recv_initial_metadata_(nullptr), 46 initial_on_done_recv_initial_metadata_(nullptr), 47 initial_on_done_recv_message_(nullptr), 48 recv_message_(nullptr), 49 recv_message_count_(0), 50 sent_message_count_(0) { 51 memset(&census_bin_, 0, sizeof(grpc_linked_mdelem)); 52 memset(&path_, 0, sizeof(grpc_slice)); 53 memset(&on_done_recv_initial_metadata_, 0, sizeof(grpc_closure)); 54 memset(&on_done_recv_message_, 0, sizeof(grpc_closure)); 55 } 56 57 grpc_error* Init(grpc_call_element* elem, 58 const grpc_call_element_args* args) override; 59 60 void Destroy(grpc_call_element* elem, const grpc_call_final_info* final_info, 61 grpc_closure* then_call_closure) override; 62 63 void StartTransportStreamOpBatch(grpc_call_element* elem, 64 TransportStreamOpBatch* op) override; 65 66 static void OnDoneRecvInitialMetadataCb(void* user_data, grpc_error* error); 67 68 static void OnDoneRecvMessageCb(void* user_data, grpc_error* error); 69 70 private: 71 CensusContext context_; 72 // server method 73 absl::string_view method_; 74 std::string qualified_method_; 75 grpc_slice path_; 76 // Pointer to the grpc_call element 77 grpc_call* gc_; 78 // Authorization context for the call. 79 grpc_auth_context* auth_context_; 80 // Metadata element for census stats. 81 grpc_linked_mdelem census_bin_; 82 // recv callback 83 grpc_metadata_batch* recv_initial_metadata_; 84 grpc_closure* initial_on_done_recv_initial_metadata_; 85 grpc_closure on_done_recv_initial_metadata_; 86 // recv message 87 grpc_closure* initial_on_done_recv_message_; 88 grpc_closure on_done_recv_message_; 89 absl::Time start_time_; 90 absl::Duration elapsed_time_; 91 grpc_core::OrphanablePtr<grpc_core::ByteStream>* recv_message_; 92 uint64_t recv_message_count_; 93 uint64_t sent_message_count_; 94 // Buffer needed for grpc_slice to reference it when adding metatdata to 95 // response. 96 char stats_buf_[kMaxServerStatsLen]; 97 }; 98 99 } // namespace grpc 100 101 #endif /* GRPC_INTERNAL_CPP_EXT_FILTERS_CENSUS_SERVER_FILTER_H */ 102