public void Process(HttpContext context, IResponseArgs e)
{
var file = GetFile(e.RequestKey, null);
var reprocessCache = false;
if (file != null)
{
try
{
var stream = file.Open();
((ResponseArgs)e).ResizeImageToStream = s => stream.CopyTo(s);
}
catch (FileNotFoundException)
{
reprocessCache = true;
}
}
if (file == null || reprocessCache)
{
var stream = new MemoryStream(4096);
e.ResizeImageToStream(stream);
Upload(e.RequestKey, stream, null);
}
context.RemapHandler(new NoCacheHandler(e));
}
/// <summary>
/// We don't actually send the data - but we still want to control the headers on the data.
/// PreSendRequestHeaders allows us to change the content-type and cache headers at exactly the last moment
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
protected void context_PreSendRequestHeaders(object sender, EventArgs e)
{
//Skip requests if the Request object isn't populated
HttpApplication app = sender as HttpApplication;
if (app == null || app.Context == null || app.Context.Items == null || app.Context.Request == null || app.Context.Response == null)
{
return;
}
HttpContext context = app.Context;
//Skip requests if we don't have an object to work with.
if (context.Items[conf.ResponseArgsKey] == null)
{
return;
}
//Try to cast the object.
IResponseArgs obj = context.Items[conf.ResponseArgsKey] as IResponseArgs;
if (obj == null)
{
return;
}
//Apply the headers
if (obj.ResponseHeaders.ApplyDuringPreSendRequestHeaders)
{
obj.ResponseHeaders.ApplyToResponse(obj.ResponseHeaders, app.Context);
}
}
public void Process(System.Web.HttpContext current, IResponseArgs e)
{
//Use alternate cache key if provided
string key = e.RequestKey + (e.HasModifiedDate ? e.GetModifiedDateUTC().Ticks.ToString() : "");
//If cached, serve it.
var c = cache.Get(key);
if (c != null) {
Serve(current, e, c);
return;
}
//If not, let's cache it.
locks.TryExecute(key, 3000, delegate() {
c = cache.Get(key);
if (c == null) {
using (var data = new MemoryStream()){
e.ResizeImageToStream(data);//Very long-running call
c = new MemCacheResult(StreamExtensions.CopyToBytes(data, true));
}
cache.Set(key, c);//Save to cache (may trigger cleanup)
}
Serve(current, e, c);
return;
});
}
public CacheResult Process(IResponseArgs e)
{
//Query for the modified date of the source file. If the source file changes on us during the write,
//we (may) end up saving the newer version in the cache properly, but with an older modified date.
//This will not cause any actual problems from a behavioral standpoint - the next request for the
//image will cause the file to be overwritten and the modified date updated.
DateTime modDate = e.HasModifiedDate ? e.GetModifiedDateUTC() : DateTime.MinValue;
//Verify web.config exists in the cache folder.
writer.CheckWebConfigEvery5();
//Cache the data to disk and return a path.
CacheResult r = cache.GetCachedFile(e.RequestKey, e.SuggestedExtension, e.ResizeImageToStream, modDate, CacheAccessTimeout, AsyncWrites);
//Fail
if (r.Result == CacheQueryResult.Failed)
{
throw new ImageResizer.ImageProcessingException("Failed to acquire a lock on file \"" + r.PhysicalPath + "\" within " + CacheAccessTimeout + "ms. Caching failed.");
}
if (r.Result == CacheQueryResult.Hit && cleaner != null)
{
cleaner.UsedFile(r.RelativePath, r.PhysicalPath);
}
return(r);
}
public void Process(System.Web.HttpContext current, IResponseArgs e)
{
//Use alternate cache key if provided
string key = e.RequestKey;
//If cached, serve it.
var c = cache.Get(key);
if (c != null)
{
Serve(current, e, c);
return;
}
//If not, let's cache it.
locks.TryExecute(key, 3000, delegate() {
c = cache.Get(key);
if (c == null)
{
using (var data = new MemoryStream()){
e.ResizeImageToStream(data);//Very long-running call
c = new MemCacheResult(data.CopyToBytes(true));
}
cache.Set(key, c);//Save to cache (may trigger cleanup)
}
Serve(current, e, c);
return;
});
}
public CacheResult Process(IResponseArgs e)
{
//Verify web.config exists in the cache folder.
writer.CheckWebConfigEvery5();
//Cache the data to disk and return a path.
CacheResult r = cache.GetCachedFile(e.RequestKey, e.SuggestedExtension, e.ResizeImageToStream, CacheAccessTimeout, AsyncWrites);
//Fail
if (r.Result == CacheQueryResult.Failed)
{
GlobalPerf.Singleton.IncrementCounter("diskcache_timeout");
throw new ImageResizer.ImageProcessingException("Failed to acquire a lock on file \"" + r.PhysicalPath + "\" within " + CacheAccessTimeout + "ms. Caching failed.");
}
if (r.Result == CacheQueryResult.Hit && cleaner != null)
{
cleaner.UsedFile(r.RelativePath, r.PhysicalPath);
}
GlobalPerf.Singleton.IncrementCounter((r.Result == CacheQueryResult.Hit) ? "diskcache_hit" : "diskcache_miss");
return(r);
}
public void Process(HttpContext context, IResponseArgs e)
{
if (this.AsyncModuleMode)
{
throw new InvalidOperationException("DiskCache cannot be used in synchronous mode if AsyncModuleMode=true");
}
CacheResult r = Process(e);
context.Items["FinalCachedFile"] = r.PhysicalPath;
if (r.Data == null)
{
//Calculate the virtual path
string virtualPath = VirtualCacheDir.TrimEnd('/') + '/' + r.RelativePath.Replace('\\', '/').TrimStart('/');
//Rewrite to cached, resized image.
context.RewritePath(virtualPath, false);
}
else
{
//Remap the response args writer to use the existing stream.
((ResponseArgs)e).ResizeImageToStream = delegate(Stream s) {
((MemoryStream)r.Data).WriteTo(s);
};
context.RemapHandler(new NoCacheHandler(e));
}
}
public bool CanProcess(System.Web.HttpContext current, IResponseArgs e)
{
if (((ResizeSettings)e.RewrittenQuerystring).Cache == ServerCacheMode.No)
{
return(false);
}
return(CanOperate);
}
public bool CanProcess(HttpContext context, IResponseArgs e)
{
if (((ResizeSettings)e.RewrittenQuerystring).Cache == ServerCacheMode.No)
{
return(false);
}
return(true);
}
public bool CanProcess(HttpContext current, IResponseArgs e)
{
// Blob storage caching will 'pass on' caching requests if 'cache=no'.
if (((ResizeSettings)e.RewrittenQuerystring).Cache == ServerCacheMode.No)
{
return(false);
}
return(Started); //Add support for nocache
}
public bool CanProcess(System.Web.HttpContext current, IResponseArgs e)
{
string match = GetUnquotedEtag(current);
string eTag = CalcualteETag(e);
string quotedTag = "\"" + eTag + "\"";
e.ResponseHeaders.Headers["X-ETag"] = quotedTag;
e.ResponseHeaders.Headers["ETag"] = quotedTag;
return (match != null && match.Equals(eTag));
}
public bool CanProcess(System.Web.HttpContext current, IResponseArgs e)
{
string match = GetUnquotedEtag(current);
string eTag = CalcualteETag(e);
string quotedTag = "\"" + eTag + "\"";
e.ResponseHeaders.Headers["X-ETag"] = quotedTag;
e.ResponseHeaders.Headers["ETag"] = quotedTag;
return(match != null && match.Equals(eTag));
}
public void Process(HttpContext current, IResponseArgs e)
{
var blobName = ResolveBlobName(e.RequestKey, e.SuggestedExtension);
var cachedStream = this.cacheProvider.Resolve(blobName, outputStream =>
{
e.ResizeImageToStream(outputStream); // long-running call
});
Serve(current, e, cachedStream);
}
/// <summary>
/// Handles the response stream for the request to images.
/// </summary>
/// <param name="context">The context.</param>
/// <param name="args">The arguments.</param>
/// <param name="stream">The stream.</param>
private void HandleResponseStream(HttpContext context, IResponseArgs args, Stream stream)
{
context.Response.Clear();
context.Response.StatusCode = 200;
context.Response.BufferOutput = true;
args.ResponseHeaders.ApplyDuringPreSendRequestHeaders = false;
args.ResponseHeaders.ApplyToResponse(args.ResponseHeaders, context);
stream.CopyTo(context.Response.OutputStream);
context.Response.OutputStream.Flush();
context.Response.End();
}
public CacheResult Process(IResponseArgs e)
{
// Cache the data to blob and return a cached result.
CacheResult r = cache.GetCachedFile(e.RequestKey, e.SuggestedExtension, e.ResizeImageToStream, CacheAccessTimeout, AsyncWrites);
// Fail
if (r.Result == CacheQueryResult.Failed)
{
throw new ImageProcessingException("Failed to acquire a lock on blob \"" + r.Path + "\" within " + CacheAccessTimeout + "ms. Caching failed.");
}
return(r);
}
public bool CanProcess(System.Web.HttpContext current, IResponseArgs e)
{
if (e == null)
{
throw new ArgumentNullException("e");
}
if (((ResizeSettings)e.RewrittenQuerystring).Cache == ServerCacheMode.No)
{
return(false);
}
return(CanOperate);
}
public void Process(System.Web.HttpContext current, IResponseArgs e)
{
var modDate = e.HasModifiedDate ? e.GetModifiedDateUTC() : DateTime.MinValue;
var key = e.RequestKey + "|" + modDate.Ticks.ToString(NumberFormatInfo.InvariantInfo);
CacheEntry entry;
byte[] data;
//Ensure cache is loaded
if (!loaded)
{
Load();
}
if (!TryGetData(key, out data, out entry))
{
Stopwatch sw = new Stopwatch();
sw.Start();
//Cache miss - process request, outside of lock
MemoryStream ms = new MemoryStream(4096);
e.ResizeImageToStream(ms);
data = StreamExtensions.CopyToBytes(ms, true);
sw.Stop();
//Save to cache
entry = PutData(key, data, sw.ElapsedMilliseconds);
}
((ResponseArgs)e).ResizeImageToStream = delegate(Stream s) {
s.Write(data, 0, data.Length);
};
current.RemapHandler(new NoCacheHandler(e));
if (cache.changes_since_cleanse > ChangeThreshold)
{
CleanseAndFlush();
}
else if (cache.changes_since_cleanse > 0 && DateTime.UtcNow.Subtract(lastFlush) > new TimeSpan(0, 0, 30))
{
Flush();
}
}
/// <summary>
/// Cache selection occurs as follows: (1) The first registered CachingSystem that returns true from .CanProcess() is the default
/// (2) The SelectCachingSystem event is fired, allowing handlers to modify the selected cache.
/// This method may return null.
/// </summary>
/// <param name="context"></param>
/// <param name="args"></param>
/// <returns></returns>
public ICache GetCachingSystem(System.Web.HttpContext context, IResponseArgs args)
{
ICache defaultCache = null;
//Grab the first cache that claims it can process the request.
foreach (ICache cache in c.Plugins.CachingSystems)
{
if (cache.CanProcess(context, args))
{
defaultCache = cache;
break;
}
}
CacheSelectionEventArgs e = new CacheSelectionEventArgs(context, args, defaultCache);
if (SelectCachingSystem != null)
{
SelectCachingSystem(this, e);
}
return(e.SelectedCache);
}
public void Process(HttpContext context, IResponseArgs e)
{
CacheResult r = Process(e);
context.Items["FinalCachedFile"] = r.PhysicalPath;
if (r.Data == null)
{
//Calculate the virtual path
string virtualPath = VirtualCacheDir.TrimEnd('/') + '/' + r.RelativePath.Replace('\\', '/').TrimStart('/');
//Rewrite to cached, resized image.
context.RewritePath(virtualPath, false);
}
else
{
//Remap the response args writer to use the existing stream.
((ResponseArgs)e).ResizeImageToStream = delegate(Stream s) {
((MemoryStream)r.Data).WriteTo(s);
};
context.RemapHandler(new NoCacheHandler(e));
}
}
public void Process(HttpContext context, IResponseArgs e)
{
CacheResult r = Process(e);
context.Items["FinalCachedFile"] = r.Path;
if (r.Data == null)
{
var keyBasis = e.RequestKey;
// Path to the file in the blob container
string path = new UrlHasher().Hash(keyBasis) + '.' + e.SuggestedExtension;
var container = GetBlobContainer();
using (var stream = container.GetBlockBlobReference(path).OpenRead())
{
HandleResponseStream(context, e, stream);
}
}
else
{
HandleResponseStream(context, e, (MemoryStream)r.Data);
}
}
public void FirePreHandleImage(System.Web.IHttpModule sender, System.Web.HttpContext context, IResponseArgs e)
{
System.Threading.Interlocked.Increment(ref processedCount);
if (PreHandleImage != null) PreHandleImage(sender, context, e);
}
/// <summary>
/// Cache selection occurs as follows: (1) The first registered CachingSystem that returns true from .CanProcess() is the default
/// (2) The SelectCachingSystem event is fired, allowing handlers to modify the selected cache.
/// This method may return null.
/// </summary>
/// <param name="context"></param>
/// <param name="args"></param>
/// <returns></returns>
public ICache GetCachingSystem(System.Web.HttpContext context, IResponseArgs args)
{
ICache defaultCache = null;
//Grab the first cache that claims it can process the request.
foreach (ICache cache in c.Plugins.CachingSystems) {
if (cache.CanProcess(context, args)) {
defaultCache = cache;
break;
}
}
CacheSelectionEventArgs e = new CacheSelectionEventArgs(context, args, defaultCache);
if (SelectCachingSystem != null) SelectCachingSystem(this, e);
return e.SelectedCache;
}
/// <summary>
/// Sends the response directly to the client with no caching logic.
/// </summary>
/// <param name="context"></param>
/// <param name="e"></param>
public void Process(System.Web.HttpContext context, IResponseArgs e)
{
context.RemapHandler(new NoCacheHandler(e));
// The following line of code does nothing. I don't think there is any way to make this work before .NET 2.0 SP2
//context.Handler = new NoCacheHandler(e);
}
private void Serve(HttpContext context, IResponseArgs e, MemCacheResult result)
{
context.RemapHandler(new MemCacheHandler(e,result.Data));
}
public static string CalcualteETag(IResponseArgs e)
{
return (e.RequestKey + (e.HasModifiedDate ? e.GetModifiedDateUTC().Ticks.ToString() : "")).GetHashCode().ToString("x");
}
public void Process(System.Web.HttpContext current, IResponseArgs e)
{
var modDate = e.HasModifiedDate ? e.GetModifiedDateUTC() : DateTime.MinValue;
var key = e.RequestKey + "|" + modDate.Ticks.ToString(NumberFormatInfo.InvariantInfo);
CacheEntry entry;
byte[] data;
//Ensure cache is loaded
if (!loaded) Load();
if (!TryGetData(key ,out data, out entry)){
Stopwatch sw = new Stopwatch();
sw.Start();
//Cache miss - process request, outside of lock
MemoryStream ms = new MemoryStream(4096);
e.ResizeImageToStream(ms);
data = StreamExtensions.CopyToBytes(ms,true);
sw.Stop();
//Save to cache
entry = PutData(key,data, sw.ElapsedMilliseconds);
}
((ResponseArgs)e).ResizeImageToStream = delegate(Stream s) {
s.Write(data,0,data.Length);
};
current.RemapHandler(new NoCacheHandler(e));
if (cache.changes_since_cleanse > ChangeThreshold) CleanseAndFlush();
else if (cache.changes_since_cleanse > 0 && DateTime.UtcNow.Subtract(lastFlush) > new TimeSpan(0, 0, 30)) {
Flush();
}
}
public bool CanProcess(System.Web.HttpContext current, IResponseArgs e)
{
return true;
}
private static void Serve(HttpContext context, IResponseArgs e, Stream data)
{
context.RemapHandler(new AzureBlobHandler(e, data));
}
public static string CalcualteETag(IResponseArgs e)
{
return((e.RequestKey + (e.HasModifiedDate ? e.GetModifiedDateUTC().Ticks.ToString() : "")).GetHashCode().ToString("x"));
}
private void Serve(HttpContext context, IResponseArgs e, MemCacheResult result)
{
context.RemapHandler(new MemCacheHandler(e, result.Data));
}
public void Process(System.Web.HttpContext current, IResponseArgs e)
{
current.RemapHandler(new Return304Handler(e));
}
public CacheSelectionEventArgs(System.Web.HttpContext context, IResponseArgs responseArgs, ICache defaultCache)
{
this.context = context;
this.responseArgs = responseArgs;
this.selectedCache = defaultCache;
}
public bool CanProcess(System.Web.HttpContext current, IResponseArgs e)
{
return(true);
}
/// <summary>
/// Sends the response directly to the client with no caching logic.
/// </summary>
/// <param name="context"></param>
/// <param name="e"></param>
public void Process(System.Web.HttpContext context, IResponseArgs e)
{
context.RemapHandler(new NoCacheHandler(e));
// The following line of code does nothing. I don't think there is any way to make this work before .NET 2.0 SP2
//context.Handler = new NoCacheHandler(e);
}
public void Process(HttpContext current, IResponseArgs e)
{
var modifiedTime = e.HasModifiedDate ? e.GetModifiedDateUTC() : DateTime.MinValue;
var hash = DateTime.MinValue.Equals(modifiedTime) ? this.GetHash(e.RequestKey) : this.GetHash(string.Format("{0}|={1}", e.RequestKey, modifiedTime));
var subDir = string.Format("{0}{1}{2}", this.PhysicalCacheDir, Path.DirectorySeparatorChar, this.GetSubDir(hash));
if (!Directory.Exists(subDir))
{
Directory.CreateDirectory(subDir);
}
var physicalPath = string.Format("{0}{1}{2}.{3}", subDir, Path.DirectorySeparatorChar, this.GetHashString(hash), e.SuggestedExtension);
Stream stream;
if (File.Exists(physicalPath))
{
var data = File.ReadAllBytes(physicalPath);
stream = new MemoryStream(data);
((ResponseArgs)e).ResizeImageToStream = s => ((MemoryStream)stream).WriteTo(s);
current.RemapHandler(new NoCacheHandler(e));
if (logger.IsDebugEnabled)
{
logger.Debug("Get image from cached file: " + physicalPath);
}
}
else
{
var memoryStream = new MemoryStream(4096);
e.ResizeImageToStream(memoryStream);
memoryStream.Position = 0;
var imageWriterKey = ImageWriterManager.GetImageWriterKey(physicalPath, modifiedTime);
var imageWriter = this.imageWriterManager.Get(imageWriterKey);
if (imageWriter == null)
{
imageWriter = new ImageWriter(physicalPath, memoryStream, modifiedTime);
this.imageWriterManager.Queue(imageWriter, delegate(ImageWriter job)
{
try
{
if (logger.IsDebugEnabled)
{
logger.Debug("Begin writing image to file: " + job.PhysicalPath);
}
using (
var fileStream = new FileStream(job.PhysicalPath, FileMode.Create, FileAccess.Write, FileShare.None))
{
job.GetReadonlyStream().WriteTo(fileStream);
fileStream.Flush();
}
if (logger.IsDebugEnabled)
{
logger.Debug("End writing image to file: " + job.PhysicalPath);
}
}
catch (Exception ex)
{
if (logger.IsErrorEnabled)
{
logger.Error(ex);
}
}
finally
{
this.imageWriterManager.Remove(imageWriterKey);
}
});
}
stream = imageWriter.GetReadonlyStream();
}
if (stream != null)
{
((ResponseArgs)e).ResizeImageToStream = s => ((MemoryStream)stream).WriteTo(s);
current.RemapHandler(new NoCacheHandler(e));
}
}
public void Process(System.Web.HttpContext current, IResponseArgs e)
{
current.RemapHandler(new Return304Handler(e));
}
public NoCacheHandler(IResponseArgs e)
{
this.e = e;
}
public Return304Handler(IResponseArgs e)
{
this.e = e;
}
public void Process(HttpContext context, IResponseArgs e)
{
CacheResult r = Process(e);
context.Items["FinalCachedFile"] = r.PhysicalPath;
if (r.Data == null) {
//Calculate the virtual path
string virtualPath = VirtualCacheDir.TrimEnd('/') + '/' + r.RelativePath.Replace('\\', '/').TrimStart('/');
//Rewrite to cached, resized image.
context.RewritePath(virtualPath, false);
} else {
//Remap the response args writer to use the existing stream.
((ResponseArgs)e).ResizeImageToStream = delegate(Stream s) {
((MemoryStream)r.Data).WriteTo(s);
};
context.RemapHandler(new NoCacheHandler(e));
}
}
public bool CanProcess(System.Web.HttpContext current, IResponseArgs e)
{
return("true".Equals(e.RewrittenQuerystring["mcache"], StringComparison.OrdinalIgnoreCase));
}
public CacheResult Process(IResponseArgs e)
{
//Query for the modified date of the source file. If the source file changes on us during the write,
//we (may) end up saving the newer version in the cache properly, but with an older modified date.
//This will not cause any actual problems from a behavioral standpoint - the next request for the
//image will cause the file to be overwritten and the modified date updated.
DateTime modDate = e.HasModifiedDate ? e.GetModifiedDateUTC() : DateTime.MinValue;
//Verify web.config exists in the cache folder.
writer.CheckWebConfigEvery5();
//Cache the data to disk and return a path.
CacheResult r = cache.GetCachedFile(e.RequestKey, e.SuggestedExtension, e.ResizeImageToStream, modDate, CacheAccessTimeout,AsyncWrites);
//Fail
if (r.Result == CacheQueryResult.Failed)
throw new ImageResizer.ImageProcessingException("Failed to acquire a lock on file \"" + r.PhysicalPath + "\" within " + CacheAccessTimeout + "ms. Caching failed.");
if (r.Result == CacheQueryResult.Hit && cleaner != null)
cleaner.UsedFile(r.RelativePath, r.PhysicalPath);
return r;
}
public void FirePreHandleImage(System.Web.IHttpModule sender, System.Web.HttpContext context, IResponseArgs e)
{
System.Threading.Interlocked.Increment(ref processedCount);
if (PreHandleImage != null)
{
PreHandleImage(sender, context, e);
}
}
public MemCacheHandler(IResponseArgs e, byte[] data)
{
this.e = e;
this.data = data;
}
public CacheSelectionEventArgs(System.Web.HttpContext context, IResponseArgs responseArgs, ICache defaultCache)
{
this.context = context;
this.responseArgs = responseArgs;
this.selectedCache = defaultCache;
}
public bool CanProcess(System.Web.HttpContext current, IResponseArgs e)
{
return "true".Equals(e.RewrittenQuerystring["mcache"], StringComparison.OrdinalIgnoreCase);
}
public NoCacheHandler(IResponseArgs e)
{
this.e = e;
}
public bool CanProcess(System.Web.HttpContext current, IResponseArgs e)
{
if (((ResizeSettings)e.RewrittenQuerystring).Cache == ServerCacheMode.No) return false;
return CanOperate;
}
public Return304Handler(IResponseArgs e)
{
this.e = e;
}
public bool CanProcess(HttpContext current, IResponseArgs e)
{
//Disk caching will 'pass on' caching requests if 'cache=no'.
if (((ResizeSettings)e.RewrittenQuerystring).Cache == ServerCacheMode.No) return false;
return Started;//Add support for nocache
}
