1 // Copyright 2023 gRPC authors. 2 // 3 // Licensed under the Apache License, Version 2.0 (the "License"); 4 // you may not use this file except in compliance with the License. 5 // You may obtain a copy of the License at 6 // 7 // http://www.apache.org/licenses/LICENSE-2.0 8 // 9 // Unless required by applicable law or agreed to in writing, software 10 // distributed under the License is distributed on an "AS IS" BASIS, 11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12 // See the License for the specific language governing permissions and 13 // limitations under the License. 14 15 #ifndef GRPC_SRC_CORE_LIB_TRANSPORT_SIMPLE_SLICE_BASED_METADATA_H 16 #define GRPC_SRC_CORE_LIB_TRANSPORT_SIMPLE_SLICE_BASED_METADATA_H 17 18 #include <grpc/support/port_platform.h> 19 20 #include "absl/strings/string_view.h" 21 #include "src/core/lib/slice/slice.h" 22 #include "src/core/lib/transport/parsed_metadata.h" 23 24 namespace grpc_core { 25 26 // Models grpc metadata (as per the rules for MetadataMap) for a metadata 27 // element that consists of a Slice. 28 // Use by deriving from this class and adding `kRepeatable` and `key()`. 29 struct SimpleSliceBasedMetadata { 30 using ValueType = Slice; 31 using MementoType = Slice; ParseMementoSimpleSliceBasedMetadata32 static MementoType ParseMemento(Slice value, 33 bool will_keep_past_request_lifetime, 34 MetadataParseErrorFn) { 35 if (will_keep_past_request_lifetime) { 36 return value.TakeUniquelyOwned(); 37 } else { 38 return value.TakeOwned(); 39 } 40 } MementoToValueSimpleSliceBasedMetadata41 static ValueType MementoToValue(MementoType value) { return value; } EncodeSimpleSliceBasedMetadata42 static Slice Encode(const ValueType& x) { return x.Ref(); } DisplayValueSimpleSliceBasedMetadata43 static absl::string_view DisplayValue(const ValueType& value) { 44 return value.as_string_view(); 45 } DisplayMementoSimpleSliceBasedMetadata46 static absl::string_view DisplayMemento(const MementoType& value) { 47 return value.as_string_view(); 48 } 49 }; 50 51 } // namespace grpc_core 52 53 #endif // GRPC_SRC_CORE_LIB_TRANSPORT_SIMPLE_SLICE_BASED_METADATA_H 54