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/*
*
* Copyright 2015 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 <grpc/support/port_platform.h>
#include <limits.h>
#include <string.h>
#include <grpc/census.h>
#include "src/core/ext/census/grpc_filter.h"
#include "src/core/lib/channel/channel_stack_builder.h"
#include "src/core/lib/surface/channel_init.h"
static bool is_census_enabled(const grpc_channel_args *a) {
size_t i;
if (a == NULL) return 0;
for (i = 0; i < a->num_args; i++) {
if (0 == strcmp(a->args[i].key, GRPC_ARG_ENABLE_CENSUS)) {
return a->args[i].value.integer != 0 && census_enabled();
}
}
return census_enabled() && !grpc_channel_args_want_minimal_stack(a);
}
static bool maybe_add_census_filter(grpc_exec_ctx *exec_ctx,
grpc_channel_stack_builder *builder,
void *arg) {
const grpc_channel_args *args =
grpc_channel_stack_builder_get_channel_arguments(builder);
if (is_census_enabled(args)) {
return grpc_channel_stack_builder_prepend_filter(
builder, (const grpc_channel_filter *)arg, NULL, NULL);
}
return true;
}
extern "C" void census_grpc_plugin_init(void) {
/* Only initialize census if no one else has and some features are
* available. */
if (census_enabled() == CENSUS_FEATURE_NONE &&
census_supported() != CENSUS_FEATURE_NONE) {
if (census_initialize(census_supported())) { /* enable all features. */
gpr_log(GPR_ERROR, "Could not initialize census.");
}
}
grpc_channel_init_register_stage(GRPC_CLIENT_CHANNEL, INT_MAX,
maybe_add_census_filter,
(void *)&grpc_client_census_filter);
grpc_channel_init_register_stage(GRPC_SERVER_CHANNEL, INT_MAX,
maybe_add_census_filter,
(void *)&grpc_server_census_filter);
}
extern "C" void census_grpc_plugin_shutdown(void) { census_shutdown(); }
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