public async Task UnaryCall_MultipleCalls_RoundRobin()
{
// Ignore errors
SetExpectedErrorsFilter(writeContext =>
{
return(true);
});
string?host = null;
Task <HelloReply> UnaryMethod(HelloRequest request, ServerCallContext context)
{
host = context.Host;
return(Task.FromResult(new HelloReply {
Message = request.Name
}));
}
// Arrange
using var endpoint1 = BalancerHelpers.CreateGrpcEndpoint <HelloRequest, HelloReply>(50051, UnaryMethod, nameof(UnaryMethod));
using var endpoint2 = BalancerHelpers.CreateGrpcEndpoint <HelloRequest, HelloReply>(50052, UnaryMethod, nameof(UnaryMethod));
var channel = await BalancerHelpers.CreateChannel(LoggerFactory, new RoundRobinConfig(), new[] { endpoint1.Address, endpoint2.Address }, connect : true);
await BalancerHelpers.WaitForSubChannelsToBeReadyAsync(Logger, channel, 2).DefaultTimeout();
var client = TestClientFactory.Create(channel, endpoint1.Method);
// Act
var reply = await client.UnaryCall(new HelloRequest { Name = "Balancer" }).ResponseAsync.DefaultTimeout();
// Assert
Assert.AreEqual("Balancer", reply.Message);
var nextHost = GetNextHost(host !);
// Act
reply = await client.UnaryCall(new HelloRequest { Name = "Balancer" }).ResponseAsync.DefaultTimeout();
// Assert
Assert.AreEqual("Balancer", reply.Message);
Assert.AreEqual(nextHost, host !);
nextHost = GetNextHost(host !);
// Act
reply = await client.UnaryCall(new HelloRequest { Name = "Balancer" }).ResponseAsync.DefaultTimeout();
// Assert
Assert.AreEqual("Balancer", reply.Message);
Assert.AreEqual(nextHost, host);
string GetNextHost(string host)
{
return(host == "127.0.0.1:50051" ? "127.0.0.1:50052" : "127.0.0.1:50051");
}
}