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-rw-r--r--src/core/ext/census/grpc_plugin.c68
1 files changed, 68 insertions, 0 deletions
diff --git a/src/core/ext/census/grpc_plugin.c b/src/core/ext/census/grpc_plugin.c
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+++ b/src/core/ext/census/grpc_plugin.c
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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 <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 maybe_add_census_filter(grpc_channel_stack_builder *builder,
+ void *arg_must_be_null) {
+ const grpc_channel_args *args =
+ grpc_channel_stack_builder_get_channel_arguments(builder);
+ if (grpc_channel_args_is_census_enabled(args)) {
+ return grpc_channel_stack_builder_prepend_filter(
+ builder, &grpc_client_census_filter, 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, NULL);
+ grpc_channel_init_register_stage(GRPC_SERVER_CHANNEL, INT_MAX,
+ maybe_add_census_filter, NULL);
+}
+
+void census_grpc_plugin_shutdown(void) { census_shutdown(); }