public override async Task stream(StreamRequest request, IServerStreamWriter <VideoChunk> responseStream, ServerCallContext context)
{
var findResult = await _repo.FindById(request.VideoId);
if (findResult == null)
{
throw new RpcException(new Status(StatusCode.NotFound, "Video not found"));
}
var downloadRequest = new DownloadRequest
{
Id = findResult.ExternalFileId,
Options = new FileOptions
{
Start = 0
}
};
var remoteStream = _fileServerClient.download(downloadRequest);
var fileStream = remoteStream.ResponseStream;
while (await fileStream.MoveNext(context.CancellationToken))
{
var chunk = fileStream.Current.Chunk;
// TODO: Transcode Chunk
await responseStream.WriteAsync(new VideoChunk { VideoId = request.VideoId, Chunk = chunk });
}
}
public override async Task stream(StreamRequest request, IServerStreamWriter <VideoChunk> responseStream, ServerCallContext context)
{
var findResult = await _repo.FindById(request.VideoId);
if (findResult == null)
{
throw new RpcException(new Status(StatusCode.NotFound, "Video not found"));
}
if (!string.IsNullOrWhiteSpace(findResult.ExternalFileId))
{
var downloadRequest = new DownloadRequest
{
Id = findResult.ExternalFileId,
Options = new FileOptions
{
Start = 0
}
};
var remoteStream = _fileServerClient.download(downloadRequest);
var fileStream = remoteStream.ResponseStream;
while (await fileStream.MoveNext(context.CancellationToken))
{
var chunk = fileStream.Current.Chunk;
// TODO: Transcode Chunk
await responseStream.WriteAsync(new VideoChunk { VideoId = request.VideoId, Chunk = chunk });
}
}
else if (!string.IsNullOrWhiteSpace(findResult.StreamName))
{
var subscriber = _redisMultiplexer.GetSubscriber();
var observable = Observable.Create <VideoChunk>(async(obs, ct) =>
{
var channel = findResult.StreamName;
await subscriber.SubscribeAsync(channel, (_, message) =>
{
obs.OnNext(FromRedisValue(message));
}).ConfigureAwait(false);
return(Disposable.Create(() => subscriber.Unsubscribe(channel)));
});
var breakCount = 0;
using (var subscription = observable.Subscribe(async(message) =>
{
try
{
if (breakCount < 3)
{
await responseStream.WriteAsync(message);
breakCount = 0;
}
}
catch (Exception e)
{
breakCount++;
_logger.LogError(e, "Error while writing video chunk to response.");
}
}))
{
_logger.LogInformation("User {UserId} subscribed to video {VideoId}", request.UserId, request.VideoId);
//This is to prevent the response stream from being disposed
while (breakCount < 3)
{
await Task.Delay(1000);
}
}
}
}
