You can use gRPC for hosting web services inside .NET core application.
![enter image description here]()
Introduction
- gRPC is a high performance, open source RPC framework initially developed by Google.
- The framework is based on a client-server model of remote procedure calls. A client application can directly call methods on a server application as if it was a local object.
Example
Server Code
class Program
{
static void Main(string[] args)
{
RunAsync().Wait();
}
private static async Task RunAsync()
{
var server = new Grpc.Core.Server
{
Ports = { { "127.0.0.1", 5000, ServerCredentials.Insecure } },
Services =
{
ServerServiceDefinition.CreateBuilder()
.AddMethod(Descriptors.Method, async (requestStream, responseStream, context) =>
{
await requestStream.ForEachAsync(async additionRequest =>
{
Console.WriteLine($"Recieved addition request, number1 = {additionRequest.X} --- number2 = {additionRequest.Y}");
await responseStream.WriteAsync(new AdditionResponse {Output = additionRequest.X + additionRequest.Y});
});
})
.Build()
}
};
server.Start();
Console.WriteLine($"Server started under [127.0.0.1:5000]. Press Enter to stop it...");
Console.ReadLine();
await server.ShutdownAsync();
}
}
Client Code
class Program
{
static void Main(string[] args)
{
RunAsync().Wait();
}
private static async Task RunAsync()
{
var channel = new Channel("127.0.0.1", 5000, ChannelCredentials.Insecure);
var invoker = new DefaultCallInvoker(channel);
using (var call = invoker.AsyncDuplexStreamingCall(Descriptors.Method, null, new CallOptions{}))
{
var responseCompleted = call.ResponseStream
.ForEachAsync(async response =>
{
Console.WriteLine($"Output: {response.Output}");
});
await call.RequestStream.WriteAsync(new AdditionRequest { X = 1, Y = 2});
Console.ReadLine();
await call.RequestStream.CompleteAsync();
await responseCompleted;
}
Console.WriteLine("Press enter to stop...");
Console.ReadLine();
await channel.ShutdownAsync();
}
}
Shared Classes between Client and Server
[Schema]
public class AdditionRequest
{
[Id(0)]
public int X { get; set; }
[Id(1)]
public int Y { get; set; }
}
[Schema]
public class AdditionResponse
{
[Id(0)]
public int Output { get; set; }
}
Service descriptors
using Grpc.Core;
public class Descriptors
{
public static Method<AdditionRequest, AdditionResponse> Method =
new Method<AdditionRequest, AdditionResponse>(
type: MethodType.DuplexStreaming,
serviceName: "AdditonService",
name: "AdditionMethod",
requestMarshaller: Marshallers.Create(
serializer: Serializer<AdditionRequest>.ToBytes,
deserializer: Serializer<AdditionRequest>.FromBytes),
responseMarshaller: Marshallers.Create(
serializer: Serializer<AdditionResponse>.ToBytes,
deserializer: Serializer<AdditionResponse>.FromBytes));
}
Serializer/Deserializer
public static class Serializer<T>
{
public static byte[] ToBytes(T obj)
{
var buffer = new OutputBuffer();
var writer = new FastBinaryWriter<OutputBuffer>(buffer);
Serialize.To(writer, obj);
var output = new byte[buffer.Data.Count];
Array.Copy(buffer.Data.Array, 0, output, 0, (int)buffer.Position);
return output;
}
public static T FromBytes(byte[] bytes)
{
var buffer = new InputBuffer(bytes);
var data = Deserialize<T>.From(new FastBinaryReader<InputBuffer>(buffer));
return data;
}
}
Output
Sample client
![Sample client output]()
Sample Server
![Sample Server output]()
References
- https://blogs.msdn.microsoft.com/dotnet/2018/12/04/announcing-net-core-3-preview-1-and-open-sourcing-windows-desktop-frameworks/
- https://grpc.io/docs/
- https://grpc.io/docs/quickstart/csharp.html
- https://github.com/grpc/grpc/tree/master/src/csharp
Benchmarks
- http://csharptest.net/787/benchmarking-wcf-compared-to-rpclibrary/index.html
do I have to create a RESTful service?- AFAIK yes (or use some 3rd-Party solution I would not know any for .NET Core) – Banker