public override async Task SendMessages(IAsyncStreamReader <ChatMessagesRequest> requestStream, IServerStreamWriter <ChatMessagesResponse> responseStream, ServerCallContext context)
{
UserLogin userLoginRequest = await GetUserLogin(requestStream, context);
var observer = new ChatObserver(responseStream, logger);
using var subscription = Pusher.Subscribe(observer);
observer.StartSendingOutgoingMessages(userLoginRequest.Id, context.CancellationToken);
// do this after subscription to ensure to get all 'i love you' messages ;)
Pusher.OnNext(CreateUserLoginMessage(userLoginRequest));
await Chatting(requestStream, context, userLoginRequest, observer, subscription);
}
private async Task Chatting(IAsyncStreamReader <ChatMessagesRequest> requestStream, ServerCallContext context, UserLogin userLoginRequest, ChatObserver observer, IDisposable subscription)
{
try
{
while (await requestStream.MoveNext(context.CancellationToken))
{
var request = requestStream.Current;
switch (request.MessagesCase)
{
case ChatMessagesRequest.MessagesOneofCase.ChatMessage:
NewOutgoingMessage(CreateChatMessage(request.ChatMessage, userLoginRequest));
break;
default:
// DoNothing, changing name is not supported yet
break;
}
}
}
catch (OperationCanceledException)
{
// It is ok.. i call it on client side even it it not needed
}
finally
{
EndReceivingMessages(subscription);
// do this after because you should not see all the 'i hate him but i am too shy to tell him' messages
NewOutgoingMessage(CreateUserLogoutMessage(userLoginRequest));
await EndSendingMessages(observer);
}
}
private async Task EndSendingMessages(ChatObserver observer)
{
await observer.StopSendingOutgoingMessages();
}
