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[transport] Move compression traits into a separate header. (#32895)
We get a circular dependency problem otherwise if these are needed in `custom_metadata.h` (which they always are for that file to be useful).pull/32897/head
Craig Tiller
2 years ago
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12 changed files with 91 additions and 41 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_METADATA_COMPRESSION_TRAITS_H |
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#define GRPC_SRC_CORE_LIB_TRANSPORT_METADATA_COMPRESSION_TRAITS_H |
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#include <grpc/support/port_platform.h> |
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#include <stddef.h> |
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namespace grpc_core { |
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///////////////////////////////////////////////////////////////////////////////
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// Compression traits.
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//
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// Each metadata trait exposes exactly one compression trait.
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// This type directs how transports might choose to compress the metadata.
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// Adding a value here typically involves editing all transports to support the
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// trait, and so should not be done lightly.
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// No compression.
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struct NoCompressionCompressor {}; |
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// Expect a single value for this metadata key, but we don't know apriori its
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// value.
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// It's ok if it changes over time, but it should be mostly stable.
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// This is used for things like user-agent, which is expected to be the same
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// for all requests.
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struct StableValueCompressor {}; |
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// Expect a single value for this metadata key, and we know apriori its value.
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template <typename T, T value> |
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struct KnownValueCompressor {}; |
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// Values are uncompressible, but expect the key to be in most requests and try
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// and compress that.
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struct FrequentKeyWithNoValueCompressionCompressor {}; |
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// Expect a small set of values for this metadata key.
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struct SmallSetOfValuesCompressor {}; |
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// Expect integral values up to N for this metadata key.
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template <size_t N> |
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struct SmallIntegralValuesCompressor {}; |
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// Specialty compressor for grpc-timeout metadata.
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struct TimeoutCompressor {}; |
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// Specialty compressors for HTTP/2 psuedo headers.
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struct HttpSchemeCompressor {}; |
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struct HttpMethodCompressor {}; |
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struct HttpStatusCompressor {}; |
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} // namespace grpc_core
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#endif // GRPC_SRC_CORE_LIB_TRANSPORT_METADATA_COMPRESSION_TRAITS_H
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