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[metadata] Move hooks into grpc_base, separate build some (#32781)
When using this internally, we noticed that it's impossible to use custom_metadata.h without creating a dependency cycle between :custom_metadata and :grpc_base. A full build refactoring is too large right now, so merge that header into :grpc_base for the time being. Also, separate `SimpleSliceBasedMetadata` into its own file, so that it can be reused in custom_metadata.h. <!-- If you know who should review your pull request, please assign it to that person, otherwise the pull request would get assigned randomly. If your pull request is for a specific language, please add the appropriate lang label. --> --------- Co-authored-by: ctiller <ctiller@users.noreply.github.com>pull/32792/head
Craig Tiller
2 years ago
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GitHub
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7fae3dec0c
10 changed files with 63 additions and 24 deletions
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// Copyright 2023 gRPC authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#ifndef GRPC_SRC_CORE_LIB_TRANSPORT_SIMPLE_SLICE_BASED_METADATA_H |
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#define GRPC_SRC_CORE_LIB_TRANSPORT_SIMPLE_SLICE_BASED_METADATA_H |
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#include <grpc/support/port_platform.h> |
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#include "absl/strings/string_view.h" |
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#include "src/core/lib/slice/slice.h" |
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#include "src/core/lib/transport/parsed_metadata.h" |
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namespace grpc_core { |
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// Models grpc metadata (as per the rules for MetadataMap) for a metadata
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// element that consists of a Slice.
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// Use by deriving from this class and adding `kRepeatable` and `key()`.
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struct SimpleSliceBasedMetadata { |
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using ValueType = Slice; |
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using MementoType = Slice; |
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static MementoType ParseMemento(Slice value, MetadataParseErrorFn) { |
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return value.TakeOwned(); |
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} |
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static ValueType MementoToValue(MementoType value) { return value; } |
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static Slice Encode(const ValueType& x) { return x.Ref(); } |
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static absl::string_view DisplayValue(const ValueType& value) { |
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return value.as_string_view(); |
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} |
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static absl::string_view DisplayMemento(const MementoType& value) { |
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return value.as_string_view(); |
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} |
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}; |
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} // namespace grpc_core
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#endif // GRPC_SRC_CORE_LIB_TRANSPORT_SIMPLE_SLICE_BASED_METADATA_H
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