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/*
*
* Copyright 2015, Google Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
#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();
}
static bool maybe_add_census_filter(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;
}
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);
}
void census_grpc_plugin_shutdown(void) { census_shutdown(); }
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