public void TestCachedFileNameGenerated(string path, string query, string expected)
{
string result1 = CachedImageHelper.GetCachedImageFileName(path);
string result2 = CachedImageHelper.GetCachedImageFileName(path, query);
Assert.AreEqual(result1, result2);
Assert.AreEqual(result1, expected);
}
/// <summary>
/// Gets a value indicating whether the image is new or updated in an asynchronous manner.
/// </summary>
/// <returns>
/// The asynchronous <see cref="Task"/> returning the value.
/// </returns>
public override async Task <bool> IsNewOrUpdatedAsync()
{
// TODO: Before this check is performed it should be throttled. For example, only perform this check
// if the last time it was checked is greater than 5 seconds. This would be much better for perf
// if there is a high throughput of image requests.
string cachedFileName = await this.CreateCachedFileNameAsync().ConfigureAwait(false);
this.CachedPath = CachedImageHelper.GetCachedPath(cloudCachedBlobContainer.Uri.ToString(), cachedFileName, true, this.FolderDepth);
this.cachedRewritePath = CachedImageHelper.GetCachedPath(useCachedContainerInUrl
? Path.Combine(cachedCdnRoot, cloudCachedBlobContainer.Name)
: cachedCdnRoot, cachedFileName, true, this.FolderDepth);
bool isUpdated = false;
CachedImage cachedImage = CacheIndexer.Get(this.CachedPath);
if (new Uri(this.CachedPath).IsFile&& File.Exists(this.CachedPath))
{
cachedImage = new CachedImage
{
Key = Path.GetFileNameWithoutExtension(this.CachedPath),
Path = this.CachedPath,
CreationTimeUtc = File.GetCreationTimeUtc(this.CachedPath)
};
CacheIndexer.Add(cachedImage, this.ImageCacheMaxMinutes);
}
if (cachedImage is null)
{
string blobPath = this.CachedPath.Substring(cloudCachedBlobContainer.Uri.ToString().Length + 1);
CloudBlockBlob blockBlob = cloudCachedBlobContainer.GetBlockBlobReference(blobPath);
if (await blockBlob.ExistsAsync().ConfigureAwait(false))
{
// Pull the latest info.
await blockBlob.FetchAttributesAsync().ConfigureAwait(false);
if (blockBlob.Properties.LastModified.HasValue)
{
cachedImage = new CachedImage
{
Key = Path.GetFileNameWithoutExtension(this.CachedPath),
Path = this.CachedPath,
CreationTimeUtc = blockBlob.Properties.LastModified.Value.UtcDateTime
};
CacheIndexer.Add(cachedImage, this.ImageCacheMaxMinutes);
}
}
}
if (cachedImage is null)
{
// Nothing in the cache so we should return true.
isUpdated = true;
}
else
{
// Check to see if the cached image is set to expire
// or a new file with the same name has replaced our current image
if (this.IsExpired(cachedImage.CreationTimeUtc) || await this.IsUpdatedAsync(cachedImage.CreationTimeUtc).ConfigureAwait(false))
{
CacheIndexer.Remove(this.CachedPath);
isUpdated = true;
}
}
return(isUpdated);
}
public void TestCachedFilePathGenerated(string path, string filename, bool makeVirtual, int depth, string expected)
{
string result = CachedImageHelper.GetCachedPath(path, filename, makeVirtual, depth);
Assert.AreEqual(result, expected);
}