private async Task SendResponse(HttpResponse response, MediaSegment mediaSegment)
{
response.StatusCode = 200;
var length = mediaSegment.Length;
if (mediaSegment.Complete)
{
response.ContentLength = mediaSegment.Length;
_logger.LogWarning($"Sending full response for {mediaSegment.Path} length:{mediaSegment.Length} ");
}
else
{
_logger.LogWarning($"Chunked transfer encoding for {mediaSegment.Path}");
}
response.GetTypedHeaders().CacheControl = new Microsoft.Net.Http.Headers.CacheControlHeaderValue
{
Public = true,
NoCache = true,
NoStore = true
};
foreach (var index in mediaSegment.GetBufferIndex())
{
var cacheKey = mediaSegment.GetChunkKey(index);
var buffer = _cache.Get <MediaBuffer>(cacheKey);
if (buffer == null)
{
throw new InvalidOperationException($"Missing cache entry for {cacheKey}");
}
await response.Body.WriteAsync(buffer.Memory);
await response.Body.FlushAsync();
}
}
private async Task ReadBodyAsync(HttpRequest request, MediaSegment mediaSegment, bool expire)
{
int count = 0;
while (true)
{
var(buffer, endOfStream) = await ReadBufferAsync(request);
var cacheKey = mediaSegment.GetChunkKey(count++);
var options = new MemoryCacheEntryOptions
{
SlidingExpiration = expire ? TimeSpan.FromSeconds(60) : (TimeSpan?)null,
Priority = expire ? CacheItemPriority.Normal : CacheItemPriority.NeverRemove,
Size = BUFFER_SIZE
};
options.RegisterPostEvictionCallback(RemoveCacheEntry);
_cache.Set <MediaBuffer>(cacheKey, buffer, options);
_logger.LogDebug($"Got buffer of size: {buffer.Length} for {cacheKey} ");
mediaSegment.AddBuffer(buffer.Length, endOfStream);
if (endOfStream)
{
break;
}
}
}
private MediaBuffer GetMediaBuffer(MediaSegment mediaSegment, int index)
{
var cacheKey = mediaSegment.GetChunkKey(index);
var buffer = _cache.Get <MediaBuffer>(cacheKey);
if (buffer == null)
{
throw new InvalidOperationException($"Missing cache entry for {cacheKey}");
}
return(buffer);
}
