public async Task ListenChat(ChatMessageRequest request, IServerStreamWriter<ChatMessage> responseStream, ServerCallContext context)
{
Log(context);
using (IAsyncEnumerator<ChatMessage> enumerator = _chatMessageRepository.ListenAccountChatAsync(request.AccountId).GetEnumerator())
{
// Custom reponse header
await context.WriteResponseHeadersAsync(new Metadata { new Metadata.Entry("Some-response-header-key", "Some-response-header-value") });
// Async enumerator
while (await enumerator.MoveNext())
{
ChatMessage chatMessage = enumerator.Current;
await responseStream.WriteAsync(chatMessage);
}
// Custom response trailer
context.ResponseTrailers.Add(new Metadata.Entry("Some-response-tailer-key", "Some-response-trailer-value"));
}
}
private static async Task EnsureEchoMetadataAsync(ServerCallContext context)
{
var echoInitialList = context.RequestHeaders.Where((entry) => entry.Key == "x-grpc-test-echo-initial").ToList();
if (echoInitialList.Any()) {
var entry = echoInitialList.Single();
await context.WriteResponseHeadersAsync(new Metadata { entry });
}
var echoTrailingList = context.RequestHeaders.Where((entry) => entry.Key == "x-grpc-test-echo-trailing-bin").ToList();
if (echoTrailingList.Any()) {
context.ResponseTrailers.Add(echoTrailingList.Single());
}
}