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@ -23,6 +23,7 @@ namespace ImageProcessor.Web.Caching |
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using ImageProcessor.Web.Extensions; |
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using ImageProcessor.Web.Helpers; |
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using ImageProcessor.Web.HttpModules; |
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using Microsoft.WindowsAzure.Storage; |
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using Microsoft.WindowsAzure.Storage.Blob; |
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@ -34,9 +35,14 @@ namespace ImageProcessor.Web.Caching |
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public class AzureBlobCache : ImageCacheBase |
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{ |
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/// <summary>
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/// The maximum number of days to store the image.
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/// The regular expression for parsing a remote uri.
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/// </summary>
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private readonly int maxDays; |
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private static readonly Regex RemoteRegex = new Regex("^http(s)?://", RegexOptions.Compiled); |
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/// <summary>
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/// The assembly version.
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/// </summary>
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private static readonly string AssemblyVersion = typeof(ImageProcessingModule).Assembly.GetName().Version.ToString(); |
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/// <summary>
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/// The cloud cached blob container.
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@ -73,32 +79,26 @@ namespace ImageProcessor.Web.Caching |
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public AzureBlobCache(string requestPath, string fullPath, string querystring) |
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: base(requestPath, fullPath, querystring) |
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{ |
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this.maxDays = Convert.ToInt32(this.Settings["MaxDays"]); |
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// Retrieve storage accounts from connection string.
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CloudStorageAccount cloudCachedStorageAccount = CloudStorageAccount.Parse(this.Settings["CachedStorageAccount"]); |
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CloudStorageAccount cloudSourceStorageAccount = CloudStorageAccount.Parse(this.Settings["SourceStorageAccount"]); |
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// Create the blob clients.
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CloudBlobClient cloudCachedBlobClient = cloudCachedStorageAccount.CreateCloudBlobClient(); |
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CloudBlobClient cloudSourceBlobClient = cloudSourceStorageAccount.CreateCloudBlobClient(); |
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// Retrieve references to a previously created containers.
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this.cloudCachedBlobContainer = cloudCachedBlobClient.GetContainerReference(this.Settings["CachedBlobContainer"]); |
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this.cloudSourceBlobContainer = cloudSourceBlobClient.GetContainerReference(this.Settings["SourceBlobContainer"]); |
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this.cachedCdnRoot = this.Settings["CachedCDNRoot"]; |
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} |
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string sourceAccount = this.Settings.ContainsKey("SourceStorageAccount") ? this.Settings["SourceStorageAccount"] : string.Empty; |
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/// <summary>
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/// Gets the maximum number of days to store the image.
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/// </summary>
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public override int MaxDays |
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{ |
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get |
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// Repeat for source if it exists
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if (!string.IsNullOrWhiteSpace(sourceAccount)) |
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{ |
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return this.maxDays; |
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CloudStorageAccount cloudSourceStorageAccount = CloudStorageAccount.Parse(this.Settings["SourceStorageAccount"]); |
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CloudBlobClient cloudSourceBlobClient = cloudSourceStorageAccount.CreateCloudBlobClient(); |
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this.cloudSourceBlobContainer = cloudSourceBlobClient.GetContainerReference(this.Settings["SourceBlobContainer"]); |
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} |
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this.cachedCdnRoot = this.Settings.ContainsKey("CachedCDNRoot") ? this.Settings["CachedCDNRoot"] : string.Empty; |
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} |
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/// <summary>
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@ -109,7 +109,7 @@ namespace ImageProcessor.Web.Caching |
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/// </returns>
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public override async Task<bool> IsNewOrUpdatedAsync() |
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{ |
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string cachedFileName = await this.CreateCachedFileName(); |
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string cachedFileName = await this.CreateCachedFileNameAsync(); |
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// Collision rate of about 1 in 10000 for the folder structure.
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// That gives us massive scope to store millions of files.
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@ -118,7 +118,7 @@ namespace ImageProcessor.Web.Caching |
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this.cachedRewritePath = Path.Combine(this.cachedCdnRoot, this.cloudCachedBlobContainer.Name, pathFromKey, cachedFileName).Replace(@"\", "/"); |
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bool isUpdated = false; |
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CachedImage cachedImage = CacheIndexer.GetValue(this.CachedPath); |
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CachedImage cachedImage = CacheIndexer.Get(this.CachedPath); |
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if (new Uri(this.CachedPath).IsFile) |
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{ |
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@ -205,6 +205,9 @@ namespace ImageProcessor.Web.Caching |
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blockBlob.Properties.ContentType = contentType; |
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blockBlob.Properties.CacheControl = string.Format("public, max-age={0}", this.MaxDays * 86400); |
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await blockBlob.SetPropertiesAsync(); |
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blockBlob.Metadata.Add("ImageProcessedBy", "ImageProcessor.Web/" + AssemblyVersion); |
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await blockBlob.SetMetadataAsync(); |
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} |
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/// <summary>
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@ -257,7 +260,7 @@ namespace ImageProcessor.Web.Caching |
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/// <returns>
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/// The asynchronous <see cref="Task"/> returning the value.
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/// </returns>
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public override async Task<string> CreateCachedFileName() |
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public override async Task<string> CreateCachedFileNameAsync() |
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{ |
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string streamHash = string.Empty; |
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@ -279,11 +282,10 @@ namespace ImageProcessor.Web.Caching |
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streamHash = string.Format("{0}{1}", creation, length); |
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} |
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} |
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else |
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else if (this.cloudSourceBlobContainer != null) |
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{ |
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Regex regex = new Regex("^http(s)?://"); |
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string container = regex.Replace(this.cloudSourceBlobContainer.Uri.ToString(), string.Empty); |
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string blobPath = regex.Replace(this.RequestPath, string.Empty); |
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string container = RemoteRegex.Replace(this.cloudSourceBlobContainer.Uri.ToString(), string.Empty); |
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string blobPath = RemoteRegex.Replace(this.RequestPath, string.Empty); |
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blobPath = blobPath.Replace(container, string.Empty).TrimStart('/'); |
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CloudBlockBlob blockBlob = this.cloudSourceBlobContainer.GetBlockBlobReference(blobPath); |
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James South
11 years ago