Asynchronous gRPC driver. 
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| formats::json::Value  | MessageToJson (const google::protobuf::Message &message) | 
|   | Returns formats::json::Value representation of protobuf message.  
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std::string  | ToString (const google::protobuf::Message &message) | 
|   | Converts message to human readable string. 
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| std::string  | ToJsonString (const google::protobuf::Message &message) | 
|   | Returns Json-string representation of protobuf message.  
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| grpc::StatusCode  | StatusCodeFromString (std::string_view str) | 
|   | Convert string to grpc::StatusCode.  
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std::string_view  | ToString (grpc::StatusCode code) noexcept | 
|   | Convert grpc::StatusCode to string. 
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