public static async Task <IList <Segment> > Download(Segment indexSource, Uri mediaUrl, CancellationToken token)
{
var policy = HttpClientProvider.GetPolicySendAsync((e) =>
{
// All exception other then Cancellation due to timeout
// result in termination
if (!(e is OperationCanceledException))
{
Logger.Error($"DownloadError {e.Message}");
return(false);
}
// Check if timeout or external cancellation.
// Both reported as OperationCancelledException
if (token.IsCancellationRequested)
{
Logger.Warn($"Download Cancelled: {indexSource.Url}");
return(false);
}
Logger.Warn($"Download Timeout: {e.Message} {indexSource.Url}");
return(true);
});
long rangeHigh = 0;
long rangeLow = 0;
RangeHeaderValue ranges = null;
if (indexSource.ByteRange.Length > 0)
{
var byteRanges = new ByteRange(indexSource.ByteRange);
ranges = new RangeHeaderValue(byteRanges.Low, byteRanges.High);
rangeHigh = byteRanges.High;
rangeLow = byteRanges.Low;
}
try
{
byte[] rawIndexData;
using (var response = await policy.ExecuteAsync(() =>
{
Logger.Info($"Download {indexSource.Url} {rangeLow}-{rangeHigh} {rangeHigh - rangeLow}");
// Watch out for https://github.com/App-vNext/Polly/issues/313
using (var request = new HttpRequestMessage(HttpMethod.Get, indexSource.Url))
{
if (ranges != null)
{
request.Headers.Range = ranges;
}
return(HttpClientProvider.NetClient.SendAsync(request, token));
}
}))
{
rawIndexData = await response.Content.ReadAsByteArrayAsync();
}
var index = ProcessIndexData(rawIndexData, (ulong)rangeHigh, mediaUrl);
Logger.Info($"{index.Count} indexes {indexSource.Url}");
return(index);
}
catch (Exception e)
{
throw new FMp4IndexerException($"Index {indexSource.Url} failed", e);
}
}