static async Task Main()
{
AppContext.SetSwitch(
"System.Net.Http.SocketsHttpHandler.Http2UnencryptedSupport", true);
// Create channel.
// Represents long-lived connection to gRPC service.
// The port number(5001) must match the port of the gRPC server.
// Tip: In ASP.NET Core apps, use client factory (similar to
// IHttpClientFactory (see https://docs.microsoft.com/en-us/aspnet/core/grpc/clientfactory).
var channel = GrpcChannel.ForAddress("http://localhost:8080");
await UnaryCall(channel);
// Tip: Reuse channel for gRPC calls, create multiple gRPC clients
// from it (including different types of clients).
var mathClient = new MathGuru.MathGuruClient(channel);
await ServerStreaming(mathClient);
await BidirectionalStreaming(mathClient);
Console.WriteLine("Press any key to exit...");
Console.ReadKey();
}
private static async Task BidirectionalStreaming(MathGuru.MathGuruClient mathClient)
{
using var duplexStream = mathClient.GetFibonacciStepByStep();
// Note that client processes streamed results from server asynchronously
var receiverTask = Task.Run(async() =>
{
// Note that this task will end when the server has closed the response stream
await foreach (var fib in duplexStream.ResponseStream.ReadAllAsync())
{
switch (fib.PayloadCase)
{
case StepByStepResult.PayloadOneofCase.Error:
Console.Error.WriteLine($"ERROR: {fib.Error.Message}");
break;
case StepByStepResult.PayloadOneofCase.Result:
Console.WriteLine(fib.Result.Result);
if (fib.Result.Result == 34)
{
// Ok, we got the highest Fibonacci number we were looking for.
// We can close the request stream so the server can gracefully stop.
await duplexStream.RequestStream.CompleteAsync();
}
break;
default:
// This should never happen
throw new InvalidOperationException($"Unexpected payload {fib.PayloadCase}");
}
}
});
// 1, 1, 2, 3, 5, 8, 13, 21, 34, 55
await duplexStream.RequestStream.WriteAsync(new FromTo()
{
From = 1, To = 10
});
// Note that the following request will result in an error
// because From (5) is < previous To (10)
await duplexStream.RequestStream.WriteAsync(new FromTo()
{
From = 5, To = 15
});
// Request a meaningful result
await duplexStream.RequestStream.WriteAsync(new FromTo()
{
From = 20, To = 40
});
// Wait until the async processing task has ended
await receiverTask;
}
private static async Task ServerStreaming(MathGuru.MathGuruClient mathClient)
{
// Note usage of new using statement (C# 8)
using var fibResult = mathClient.GetFibonacci(new FromTo()
{
From = 10, To = 50
});
// Note usage of new streaming enumerable
await foreach (var fib in fibResult.ResponseStream.ReadAllAsync())
{
Console.WriteLine(fib);
}
}
