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// Copyright 2021 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.
#include "test/core/compression/args_utils.h"
#include <string.h>
#include "absl/types/optional.h"
#include <grpc/compression.h>
#include <grpc/support/log.h>
#include "src/core/lib/channel/channel_args.h"
#include "src/core/lib/compression/compression_internal.h"
#include "src/core/lib/gpr/useful.h"
const grpc_channel_args*
grpc_channel_args_set_channel_default_compression_algorithm(
const grpc_channel_args* a, grpc_compression_algorithm algorithm) {
GPR_ASSERT(algorithm < GRPC_COMPRESS_ALGORITHMS_COUNT);
grpc_arg tmp;
tmp.type = GRPC_ARG_INTEGER;
tmp.key = const_cast<char*>(GRPC_COMPRESSION_CHANNEL_DEFAULT_ALGORITHM);
tmp.value.integer = algorithm;
return grpc_channel_args_copy_and_add(a, &tmp, 1);
}
/** Returns 1 if the argument for compression algorithm's enabled states bitset
* was found in \a a, returning the arg's value in \a states. Otherwise, returns
* 0. */
static int find_compression_algorithm_states_bitset(const grpc_channel_args* a,
int** states_arg) {
if (a != nullptr) {
size_t i;
for (i = 0; i < a->num_args; ++i) {
if (a->args[i].type == GRPC_ARG_INTEGER &&
!strcmp(GRPC_COMPRESSION_CHANNEL_ENABLED_ALGORITHMS_BITSET,
a->args[i].key)) {
*states_arg = &a->args[i].value.integer;
**states_arg =
(**states_arg & ((1 << GRPC_COMPRESS_ALGORITHMS_COUNT) - 1)) |
0x1; /* forcefully enable support for no compression */
return 1;
}
}
}
return 0; /* GPR_FALSE */
}
const grpc_channel_args* grpc_channel_args_compression_algorithm_set_state(
const grpc_channel_args** a, grpc_compression_algorithm algorithm,
int state) {
int* states_arg = nullptr;
const grpc_channel_args* result = *a;
const int states_arg_found =
find_compression_algorithm_states_bitset(*a, &states_arg);
if (grpc_core::DefaultCompressionAlgorithmFromChannelArgs(*a) == algorithm &&
state == 0) {
const char* algo_name = nullptr;
GPR_ASSERT(grpc_compression_algorithm_name(algorithm, &algo_name) != 0);
gpr_log(GPR_ERROR,
"Tried to disable default compression algorithm '%s'. The "
"operation has been ignored.",
algo_name);
} else if (states_arg_found) {
if (state != 0) {
grpc_core::SetBit(reinterpret_cast<unsigned*>(states_arg), algorithm);
} else if (algorithm != GRPC_COMPRESS_NONE) {
grpc_core::ClearBit(reinterpret_cast<unsigned*>(states_arg), algorithm);
}
} else {
/* create a new arg */
grpc_arg tmp;
tmp.type = GRPC_ARG_INTEGER;
tmp.key =
const_cast<char*>(GRPC_COMPRESSION_CHANNEL_ENABLED_ALGORITHMS_BITSET);
/* all enabled by default */
tmp.value.integer = (1u << GRPC_COMPRESS_ALGORITHMS_COUNT) - 1;
if (state != 0) {
grpc_core::SetBit(reinterpret_cast<unsigned*>(&tmp.value.integer),
algorithm);
} else if (algorithm != GRPC_COMPRESS_NONE) {
grpc_core::ClearBit(reinterpret_cast<unsigned*>(&tmp.value.integer),
algorithm);
}
result = grpc_channel_args_copy_and_add(*a, &tmp, 1);
grpc_channel_args_destroy(*a);
*a = result;
}
return result;
}
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