private async Task <MemoryStream> GetPhoto(Attachment attachment, SignWith signWith, DateTime now)
{
// 1. Found in cache?
if (this.imageCacheService.TryGet(attachment.Url, out MemoryStream stream))
{
return(stream);
}
// 2. Needs download
KeyValuePair <string, TemporaryFile> pair = await this.neuronService.Contracts.GetAttachment(attachment.Url, signWith, Constants.Timeouts.DownloadFile);
// If download has been cancelled any time _during_ download, stop here.
if (this.loadPhotosTimestamp > now)
{
pair.Value.Dispose();
return(null);
}
using (TemporaryFile file = pair.Value)
{
file.Reset();
MemoryStream ms = new MemoryStream();
await file.CopyToAsync(ms);
// 3. Save to cache
ms.Reset();
await this.imageCacheService.Add(attachment.Url, ms);
ms.Reset();
return(ms);
}
}