public static byte[] GetPictureSynchronously(PictureDefinition def)
{
lock (cacheLocker)
{
if (!cache.ContainsKey(def) || cache[def] == null)
{
var path = getPath(def);
var bytes
= File.Exists(path)
? File.ReadAllBytes(path)
: downloadBytes(def);
cache[def] = bytes;
}
return(cache[def]);
}
}
public static (bool isDefault, byte[] bytes) GetPicture(PictureDefinition def)
{
lock (cacheLocker)
{
if (cache.ContainsKey(def))
{
return(false, cache[def]);
}
var path = getPath(def);
if (File.Exists(path))
{
cache[def] = File.ReadAllBytes(path);
return(false, cache[def]);
}
DownloadQueue.Add(def);
return(true, getDefaultImage(def.Size));
}
}
private static byte[] downloadBytes(PictureDefinition def)
{
if (def.PictureId is null)
{
return(getDefaultImage(def.Size));
}
try
{
var sz = (int)def.Size;
var bytes = imageDownloadClient.GetByteArrayAsync("ht" + $"tps://images-na.ssl-images-amazon.com/images/I/{def.PictureId}._SL{sz}_.jpg").Result;
// save image file. make sure to not save default image
var path = getPath(def);
File.WriteAllBytes(path, bytes);
return(bytes);
}
catch
{
return(getDefaultImage(def.Size));
}
}
private static string getPath(PictureDefinition def)
=> Path.Combine(ImagesDirectory, $"{def.PictureId}{def.Size}.jpg");