![Modify Program.cs
class Program
{
const int Port = 50051;
static void Main(string[] args)
{
Server server = new Server
{
Services = { Greeter.BindService(new GreeterImpl()) },
Ports = { new ServerPort("localhost", Port, ServerCredentials.Insecure) }
};
server.Start();
Console.WriteLine("Greeter server listening on port " + Port);
Console.WriteLine("Press any key to stop the server...");
Console.ReadKey();
server.ShutdownAsync().Wait();
}
}](https://image.slidesharecdn.com/grpclection1-160519075957/85/G-rpc-lection1-12-320.jpg)
![Modify Program.cs
class Program
{
static void Main(string[] args)
{
Channel channel = new Channel("127.0.0.1:50051", ChannelCredentials.Insecure);
var client = Greeter.NewClient(channel);
String user = "you";
var reply = client.SayHello(new HelloRequest { Name = user });
Console.WriteLine("Greeting: " + reply.Message);
channel.ShutdownAsync().Wait();
Console.WriteLine("Press any key to exit...");
Console.ReadKey();
}
}](https://image.slidesharecdn.com/grpclection1-160519075957/85/G-rpc-lection1-14-320.jpg)
G rpc lection1
- 1. eleks.comeleks.com Google RPC. Creating Hello world sample for gRPC
- 2. Create Solution with class library for stub code (named Greeter)
- 3. In a class library: • Create Folder “protos” – for server interface and types descripted files. • Create Folder “gen” – for generated by grps tools code. • Add new item to project – “generate_protos.bat” file • Remove useless Class1 file
- 4. Add such gRPC nuget references: • Grpc.Core (v 0.14.0) • Grpc.Tools (v 0.14.0) • Google.protobuf.custom (v 3.0.0 beta-2
- 5. Now project looks like this:
- 6. Create proto file • In a “protos” folder create “helloworld.proto” file. • Add Server interface and types code to proto file (next slide)
- 7. Proto file content: syntax = "proto3"; option java_multiple_files = true; option java_package = "io.grpc.examples.helloworld"; option java_outer_classname = "HelloWorldProto"; option objc_class_prefix = "HLW"; package helloworld; // The greeting service definition. service Greeter { // Sends a greeting rpc SayHello (HelloRequest) returns (HelloReply) {} } // The request message containing the user's name. message HelloRequest { string name = 1; } // The response message containing the greetings message HelloReply { string message = 1; }
- 8. Create bat file for generating stub code from proto file • Add to project file “generate_protos.bat” file • This bat will run gRPC code generating tools with argument proto file
- 9. Generate_protos.bat content @rem Generate the C# code for .proto files setlocal @rem enter this directory cd /d %~dp0 @rem set TOOLS_PATH=..packagesGrpc.Tools.0.14.0toolswindows_x86 set TOOLS_PATH=..packagesGrpc.Tools.0.14.0toolswindows_x86 %TOOLS_PATH%protoc.exe -I protos --csharp_out gen protos/helloworld.proto --grpc_out gen - -plugin=protoc-gen-grpc=%TOOLS_PATH%grpc_csharp_plugin.exe endlocal
- 10. Generating stub code: • Run cmd, go to generate_protos.bat location • Run generate_protos.bat • Open “gen”, see newly generated files appeared • Add new files to project • Build Project in x86 configuration
- 11. Add Server project • Add “GreeterServer” visual C# console application project. • With nuget package add Grpc.Core (v 0.14.0) package. • Reference “Greeter” project to GreeterServer project • Add using Grpc.Core and Helloworld. • Add GreeterImpl class to Server project code class GreeterImpl : Greeter.IGreeter { // Server side handler of the SayHello RPC public Task<HelloReply> SayHello(HelloRequest request, ServerCallContext context) { return Task.FromResult(new HelloReply { Message = "Hello " + request.Name }); } }
- 12. Modify Program.cs class Program { const int Port = 50051; static void Main(string[] args) { Server server = new Server { Services = { Greeter.BindService(new GreeterImpl()) }, Ports = { new ServerPort("localhost", Port, ServerCredentials.Insecure) } }; server.Start(); Console.WriteLine("Greeter server listening on port " + Port); Console.WriteLine("Press any key to stop the server..."); Console.ReadKey(); server.ShutdownAsync().Wait(); } }
- 13. Add Client project • Add “GreeterClient” visual C# console application project. • With nuget package add Grpc.Core (v 0.14.0) package. • Reference “Greeter” project to GreeterServer project • Add using Grpc.Core and Helloworld.
- 14. Modify Program.cs class Program { static void Main(string[] args) { Channel channel = new Channel("127.0.0.1:50051", ChannelCredentials.Insecure); var client = Greeter.NewClient(channel); String user = "you"; var reply = client.SayHello(new HelloRequest { Name = user }); Console.WriteLine("Greeting: " + reply.Message); channel.ShutdownAsync().Wait(); Console.WriteLine("Press any key to exit..."); Console.ReadKey(); } }
- 15. Build and Run • Build entire solution in x86 configuration, see it is building without errors. • Run GreetingServer and GreetingClient • See GreetingClient receives response.
- 16. Result !
- 17. Практичне завдання: • Базуючись на попередньому Helloworld прикладі • Створити клієнт серверну програму, яка використовуватиме gRPC для комунікації • Вид аплікації – це система для офіціанта в кафе, де він записує замовлення, клієнтів і т.д. • Для gRPC методів можна використовувати прості типи (тільки string, як в прокладі ) • Ця практична використовуватиметься як база для наступного практичного завдання