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ref:cde9a383711a11544ce7e107a78147fb96cc4029

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diff --git a/contrib/libs/grpc/src/cpp/common/tls_credentials_options_util.h b/contrib/libs/grpc/src/cpp/common/tls_credentials_options_util.h
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+++ b/contrib/libs/grpc/src/cpp/common/tls_credentials_options_util.h
@@ -0,0 +1,58 @@
+/*
+ *
+ * Copyright 2019 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.
+ *
+ */
+
+#ifndef GRPC_INTERNAL_CPP_COMMON_TLS_CREDENTIALS_OPTIONS_UTIL_H
+#define GRPC_INTERNAL_CPP_COMMON_TLS_CREDENTIALS_OPTIONS_UTIL_H
+
+#include <grpc/grpc_security.h>
+#include <grpcpp/security/tls_credentials_options.h>
+
+#include "src/core/lib/security/credentials/tls/grpc_tls_credentials_options.h"
+
+namespace grpc {
+namespace experimental {
+
+/** The following function is exposed for testing purposes. **/
+grpc_tls_key_materials_config* ConvertToCKeyMaterialsConfig(
+    const std::shared_ptr<TlsKeyMaterialsConfig>& config);
+
+/** The following 4 functions convert the user-provided schedule or cancel
+ *  functions into C style schedule or cancel functions. These are internal
+ *  functions, not meant to be accessed by the user. **/
+int TlsCredentialReloadConfigCSchedule(void* config_user_data,
+                                       grpc_tls_credential_reload_arg* arg);
+
+void TlsCredentialReloadConfigCCancel(void* config_user_data,
+                                      grpc_tls_credential_reload_arg* arg);
+
+int TlsServerAuthorizationCheckConfigCSchedule(
+    void* config_user_data, grpc_tls_server_authorization_check_arg* arg);
+
+void TlsServerAuthorizationCheckConfigCCancel(
+    void* config_user_data, grpc_tls_server_authorization_check_arg* arg);
+
+/** The following 2 functions cleanup data created in the above C schedule
+ *  functions. **/
+void TlsCredentialReloadArgDestroyContext(void* context);
+
+void TlsServerAuthorizationCheckArgDestroyContext(void* context);
+
+}  //  namespace experimental
+}  // namespace grpc
+
+#endif  // GRPC_INTERNAL_CPP_COMMON_TLS_CREDENTIALS_OPTIONS_UTIL_H