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/*
*
* Copyright 2017, 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 <string.h>
#include "src/core/ext/filters/http/client/http_client_filter.h"
#include "src/core/ext/filters/http/message_compress/message_compress_filter.h"
#include "src/core/ext/filters/http/server/http_server_filter.h"
#include "src/core/lib/channel/channel_stack_builder.h"
#include "src/core/lib/surface/call.h"
#include "src/core/lib/surface/channel_init.h"
#include "src/core/lib/transport/transport_impl.h"
typedef struct {
const grpc_channel_filter *filter;
const char *control_channel_arg;
} optional_filter;
static optional_filter compress_filter = {
&grpc_message_compress_filter, GRPC_ARG_ENABLE_PER_MESSAGE_COMPRESSION};
static bool is_building_http_like_transport(
grpc_channel_stack_builder *builder) {
grpc_transport *t = grpc_channel_stack_builder_get_transport(builder);
return t != NULL && strstr(t->vtable->name, "http");
}
static bool maybe_add_optional_filter(grpc_exec_ctx *exec_ctx,
grpc_channel_stack_builder *builder,
void *arg) {
if (!is_building_http_like_transport(builder)) return true;
optional_filter *filtarg = arg;
const grpc_channel_args *channel_args =
grpc_channel_stack_builder_get_channel_arguments(builder);
bool enable = grpc_channel_arg_get_bool(
grpc_channel_args_find(channel_args, filtarg->control_channel_arg),
!grpc_channel_args_want_minimal_stack(channel_args));
return enable ? grpc_channel_stack_builder_prepend_filter(
builder, filtarg->filter, NULL, NULL)
: true;
}
static bool maybe_add_required_filter(grpc_exec_ctx *exec_ctx,
grpc_channel_stack_builder *builder,
void *arg) {
return is_building_http_like_transport(builder)
? grpc_channel_stack_builder_prepend_filter(
builder, (const grpc_channel_filter *)arg, NULL, NULL)
: true;
}
void grpc_http_filters_init(void) {
grpc_register_tracer("compression", &grpc_compression_trace);
grpc_channel_init_register_stage(GRPC_CLIENT_SUBCHANNEL,
GRPC_CHANNEL_INIT_BUILTIN_PRIORITY,
maybe_add_optional_filter, &compress_filter);
grpc_channel_init_register_stage(GRPC_CLIENT_DIRECT_CHANNEL,
GRPC_CHANNEL_INIT_BUILTIN_PRIORITY,
maybe_add_optional_filter, &compress_filter);
grpc_channel_init_register_stage(GRPC_SERVER_CHANNEL,
GRPC_CHANNEL_INIT_BUILTIN_PRIORITY,
maybe_add_optional_filter, &compress_filter);
grpc_channel_init_register_stage(
GRPC_CLIENT_SUBCHANNEL, GRPC_CHANNEL_INIT_BUILTIN_PRIORITY,
maybe_add_required_filter, (void *)&grpc_http_client_filter);
grpc_channel_init_register_stage(
GRPC_CLIENT_DIRECT_CHANNEL, GRPC_CHANNEL_INIT_BUILTIN_PRIORITY,
maybe_add_required_filter, (void *)&grpc_http_client_filter);
grpc_channel_init_register_stage(
GRPC_SERVER_CHANNEL, GRPC_CHANNEL_INIT_BUILTIN_PRIORITY,
maybe_add_required_filter, (void *)&grpc_http_server_filter);
}
void grpc_http_filters_shutdown(void) {}
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