1 files changed, 69 insertions, 0 deletions
diff --git a/src/core/ext/filters/load_reporting/server_load_reporting_plugin.c b/src/core/ext/filters/load_reporting/server_load_reporting_plugin.c
new file mode 100644
index 0000000000..f56afd27d2
--- /dev/null
+++ b/src/core/ext/filters/load_reporting/server_load_reporting_plugin.c
@@ -0,0 +1,69 @@
+/*
+ *
+ * Copyright 2016 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/load_reporting.h>
+#include <grpc/support/alloc.h>
+#include <grpc/support/sync.h>
+
+#include "src/core/ext/filters/load_reporting/server_load_reporting_filter.h"
+#include "src/core/ext/filters/load_reporting/server_load_reporting_plugin.h"
+#include "src/core/lib/channel/channel_stack_builder.h"
+#include "src/core/lib/slice/slice_internal.h"
+#include "src/core/lib/surface/call.h"
+#include "src/core/lib/surface/channel_init.h"
+
+static bool is_load_reporting_enabled(const grpc_channel_args *a) {
+  return grpc_channel_arg_get_bool(
+      grpc_channel_args_find(a, GRPC_ARG_ENABLE_LOAD_REPORTING), false);
+}
+
+static bool maybe_add_server_load_reporting_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);
+  const grpc_channel_filter *filter = (const grpc_channel_filter *)arg;
+  grpc_channel_stack_builder_iterator *it =
+      grpc_channel_stack_builder_iterator_find(builder, filter->name);
+  const bool already_has_load_reporting_filter =
+      !grpc_channel_stack_builder_iterator_is_end(it);
+  grpc_channel_stack_builder_iterator_destroy(it);
+  if (is_load_reporting_enabled(args) && !already_has_load_reporting_filter) {
+    return grpc_channel_stack_builder_prepend_filter(builder, filter, NULL,
+                                                     NULL);
+  }
+  return true;
+}
+
+grpc_arg grpc_load_reporting_enable_arg() {
+  return grpc_channel_arg_integer_create(GRPC_ARG_ENABLE_LOAD_REPORTING, 1);
+}
+
+/* Plugin registration */
+
+void grpc_server_load_reporting_plugin_init(void) {
+  grpc_channel_init_register_stage(GRPC_SERVER_CHANNEL, INT_MAX,
+                                   maybe_add_server_load_reporting_filter,
+                                   (void *)&grpc_server_load_reporting_filter);
+}
+
+void grpc_server_load_reporting_plugin_shutdown() {}