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/*
*
* Copyright 2017 gRPC authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*/
#ifndef GRPC_CORE_LIB_COMPRESSION_COMPRESSION_INTERNAL_H
#define GRPC_CORE_LIB_COMPRESSION_COMPRESSION_INTERNAL_H
#include <grpc/support/port_platform.h>
#include <initializer_list>
#include "absl/strings/string_view.h"
#include "absl/types/optional.h"
#include <grpc/compression.h>
#include <grpc/impl/codegen/grpc_types.h>
#include <grpc/slice.h>
#include "src/core/lib/gprpp/bitset.h"
#include "src/core/lib/slice/slice.h"
namespace grpc_core {
// Given a string naming a compression algorithm, return the corresponding enum
// or nullopt on error.
absl::optional<grpc_compression_algorithm> ParseCompressionAlgorithm(
absl::string_view algorithm);
// Convert a compression algorithm to a string. Returns nullptr if a name is not
// known.
const char* CompressionAlgorithmAsString(grpc_compression_algorithm algorithm);
// Retrieve the default compression algorithm from channel args, return nullopt
// if not found.
absl::optional<grpc_compression_algorithm>
DefaultCompressionAlgorithmFromChannelArgs(const grpc_channel_args* args);
int DefaultGzipCompressionLevelFromChannelArgs(const grpc_channel_args* args);
int DefaultGrpcMinMessageSizeToCompressFromChannelArgs(
const grpc_channel_args* args);
// A set of grpc_compression_algorithm values.
class CompressionAlgorithmSet {
public:
// Construct from a uint32_t bitmask - bit 0 => algorithm 0, bit 1 =>
// algorithm 1, etc.
static CompressionAlgorithmSet FromUint32(uint32_t value);
// Locate in channel args and construct from the found value.
static CompressionAlgorithmSet FromChannelArgs(const grpc_channel_args* args);
// Parse a string of comma-separated compression algorithms.
static CompressionAlgorithmSet FromString(absl::string_view str);
// Construct an empty set.
CompressionAlgorithmSet();
// Construct from a std::initializer_list of grpc_compression_algorithm
// values.
CompressionAlgorithmSet(
std::initializer_list<grpc_compression_algorithm> algorithms);
// Given a compression level, choose an appropriate algorithm from this set.
grpc_compression_algorithm CompressionAlgorithmForLevel(
grpc_compression_level level) const;
// Return true if this set contains algorithm, false otherwise.
bool IsSet(grpc_compression_algorithm algorithm) const;
// Add algorithm to this set.
void Set(grpc_compression_algorithm algorithm);
// Return a comma separated string of the algorithms in this set.
std::string ToString() const;
Slice ToSlice() const;
// Return a bitmask of the algorithms in this set.
uint32_t ToLegacyBitmask() const;
bool operator==(const CompressionAlgorithmSet& other) const {
return set_ == other.set_;
}
private:
BitSet<GRPC_COMPRESS_ALGORITHMS_COUNT> set_;
};
} // namespace grpc_core
#endif /* GRPC_CORE_LIB_COMPRESSION_COMPRESSION_INTERNAL_H */
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