private static async Task <SignalRStreamingCall> GetSignalRStateAsync(int i)
{
if (!SignalRCache.TryGetValue(i, out var state))
{
var builder = new HubConnectionBuilder();
builder.WithUrl("http://localhost:5000/greeterhub");
builder.AddMessagePackProtocol();
var hubConnection = builder.Build();
await hubConnection.StartAsync();
var channel = System.Threading.Channels.Channel.CreateUnbounded <string>(new UnboundedChannelOptions
{
SingleReader = true,
SingleWriter = true
});
var result = hubConnection.StreamAsync <string>("SayHelloBiDi", channel.Reader);
state = new SignalRStreamingCall
{
RequestStream = channel.Writer,
ResponseStream = result.GetAsyncEnumerator()
};
bool success = SignalRCache.TryAdd(i, state);
if (!success)
{
throw new InvalidOperationException();
}
}
return(state);
}
private static async Task <HelloReply> MakeSignalRCall(HelloRequest request, SignalRStreamingCall state)
{
await state.RequestStream.WriteAsync(request.Name);
if (!await state.ResponseStream.MoveNextAsync())
{
throw new InvalidOperationException("Unexpected end of stream.");
}
return(new HelloReply
{
Message = state.ResponseStream.Current
});
}