1 /* 2 * 3 * Copyright 2017 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 #include <grpc/support/port_platform.h> 20 21 #include "src/core/lib/transport/status_metadata.h" 22 23 #include "src/core/lib/slice/slice_string_helpers.h" 24 #include "src/core/lib/transport/static_metadata.h" 25 26 /* we offset status by a small amount when storing it into transport metadata 27 as metadata cannot store a 0 value (which is used as OK for grpc_status_codes 28 */ 29 #define STATUS_OFFSET 1 30 31 static void destroy_status(void* ignored) {} 32 33 grpc_status_code grpc_get_status_code_from_metadata(grpc_mdelem md) { 34 if (grpc_mdelem_eq(md, GRPC_MDELEM_GRPC_STATUS_0)) { 35 return GRPC_STATUS_OK; 36 } 37 if (grpc_mdelem_eq(md, GRPC_MDELEM_GRPC_STATUS_1)) { 38 return GRPC_STATUS_CANCELLED; 39 } 40 if (grpc_mdelem_eq(md, GRPC_MDELEM_GRPC_STATUS_2)) { 41 return GRPC_STATUS_UNKNOWN; 42 } 43 void* user_data = grpc_mdelem_get_user_data(md, destroy_status); 44 if (user_data != nullptr) { 45 return static_cast<grpc_status_code>((intptr_t)user_data - STATUS_OFFSET); 46 } 47 uint32_t status; 48 if (!grpc_parse_slice_to_uint32(GRPC_MDVALUE(md), &status)) { 49 status = GRPC_STATUS_UNKNOWN; /* could not parse status code */ 50 } 51 grpc_mdelem_set_user_data( 52 md, destroy_status, (void*)static_cast<intptr_t>(status + STATUS_OFFSET)); 53 return static_cast<grpc_status_code>(status); 54 } 55
