--- /dev/null
+/*
+ *
+ * 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.
+ *
+ */
+
+#include <grpc/support/port_platform.h>
+
+#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 != nullptr && strstr(t->vtable->name, "http");
+}
+
+static bool maybe_add_optional_filter(grpc_channel_stack_builder* builder,
+ void* arg) {
+ if (!is_building_http_like_transport(builder)) return true;
+ optional_filter* filtarg = static_cast<optional_filter*>(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, nullptr, nullptr)
+ : true;
+}
+
+static bool maybe_add_required_filter(grpc_channel_stack_builder* builder,
+ void* arg) {
+ return is_building_http_like_transport(builder)
+ ? grpc_channel_stack_builder_prepend_filter(
+ builder, static_cast<const grpc_channel_filter*>(arg),
+ nullptr, nullptr)
+ : true;
+}
+
+void grpc_http_filters_init(void) {
+ 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) {}