CallbackRequest is no longer reused, so remove relics to support reuse

src/cpp/server/server_cc.cc

@@ -547,11 +547,7 @@ class Server::CallbackRequest final
                                  grpc::internal::RpcMethod::SERVER_STREAMING),
         cq_(cq),
         tag_(this) {
-    server->Ref();
-    Setup();
-    data->tag = &tag_;
-    data->call = &call_;
-    data->initial_metadata = &request_metadata_;
+    CommonSetup(server, data);
     data->deadline = &deadline_;
     data->optional_payload = has_request_payload_ ? &request_payload_ : nullptr;
   }
@@ -563,22 +559,20 @@ class Server::CallbackRequest final
       : server_(server),
         method_(nullptr),
         has_request_payload_(false),
+        call_details_(new grpc_call_details),
         cq_(cq),
         tag_(this) {
-    server->Ref();
-    Setup();
-    data->tag = &tag_;
-    data->call = &call_;
-    data->initial_metadata = &request_metadata_;
-    if (!call_details_) {
-      call_details_ = new grpc_call_details;
-      grpc_call_details_init(call_details_);
-    }
+    CommonSetup(server, data);
+    grpc_call_details_init(call_details_);
     data->details = call_details_;
   }
 
   ~CallbackRequest() {
-    Clear();
+    delete call_details_;
+    grpc_metadata_array_destroy(&request_metadata_);
+    if (has_request_payload_ && request_payload_) {
+      grpc_byte_buffer_destroy(request_payload_);
+    }
     server_->UnrefWithPossibleNotify();
   }
 
@@ -688,40 +682,27 @@ class Server::CallbackRequest final
     }
   };
 
-  void Clear() {
-    if (call_details_) {
-      delete call_details_;
-      call_details_ = nullptr;
-    }
-    grpc_metadata_array_destroy(&request_metadata_);
-    if (has_request_payload_ && request_payload_) {
-      grpc_byte_buffer_destroy(request_payload_);
-    }
-    ctx_.Clear();
-    interceptor_methods_.ClearState();
-  }
-
-  void Setup() {
+  template <class CallAllocation>
+  void CommonSetup(Server* server, CallAllocation* data) {
+    server->Ref();
     grpc_metadata_array_init(&request_metadata_);
-    ctx_.Setup(gpr_inf_future(GPR_CLOCK_REALTIME));
-    request_payload_ = nullptr;
-    request_ = nullptr;
-    handler_data_ = nullptr;
-    request_status_ = grpc::Status();
+    data->tag = &tag_;
+    data->call = &call_;
+    data->initial_metadata = &request_metadata_;
   }
 
   Server* const server_;
   grpc::internal::RpcServiceMethod* const method_;
   const bool has_request_payload_;
-  grpc_byte_buffer* request_payload_;
-  void* request_;
-  void* handler_data_;
+  grpc_byte_buffer* request_payload_ = nullptr;
+  void* request_ = nullptr;
+  void* handler_data_ = nullptr;
   grpc::Status request_status_;
-  grpc_call_details* call_details_ = nullptr;
+  grpc_call_details* const call_details_ = nullptr;
   grpc_call* call_;
   gpr_timespec deadline_;
   grpc_metadata_array request_metadata_;
-  grpc::CompletionQueue* cq_;
+  grpc::CompletionQueue* const cq_;
   CallbackCallTag tag_;
   ServerContextType ctx_;
   grpc::internal::InterceptorBatchMethodsImpl interceptor_methods_;