/// <summary>
/// Main worker method reads binary from Broker and stores it in file-system
/// </summary>
/// <returns></returns>
public bool ProcessRequest(HttpRequest request)
{
string urlPath = request.Url.AbsolutePath.Replace("/BinaryData", "");
LoggerService.Debug("Start processing " + urlPath);
Dimensions dimensions = null;
urlPath = StripDimensions(urlPath, out dimensions);
String physicalPath = request.PhysicalPath;
string cacheKey = GetCacheKey(urlPath);
DateTime?lastPublishedDate = CacheAgent.Load(cacheKey) as DateTime?;
if (lastPublishedDate == null)
{
DateTime lpb = BinaryFactory.FindLastPublishedDate(urlPath);
if (lpb != DateTime.MinValue.AddSeconds(1)) // this is the secret code for 'does not exist'
{
lastPublishedDate = new DateTime?(lpb);
CacheAgent.Store(cacheKey, "Binary", lastPublishedDate);
}
}
if (lastPublishedDate != null)
{
if (File.Exists(physicalPath))
{
FileInfo fi = new FileInfo(physicalPath);
if (fi.Length > 0)
{
DateTime fileModifiedDate = File.GetLastWriteTime(physicalPath);
if (fileModifiedDate.CompareTo(lastPublishedDate) >= 0)
{
LoggerService.Debug("binary {0} is still up to date, no action required", urlPath);
return(true);
}
}
}
}
// the normal situation (where a binary is still in Tridion and it is present on the file system already and it is up to date) is now covered
// Let's handle the exception situations.
IBinary binary = null;
try
{
BinaryFactory.TryFindBinary(urlPath, out binary);
}
catch (BinaryNotFoundException)
{
LoggerService.Debug("Binary with url {0} not found", urlPath);
// binary does not exist in Tridion, it should be removed from the local file system too
if (File.Exists(physicalPath))
{
DeleteFile(physicalPath);
}
return(false);
}
return(WriteBinaryToFile(binary, physicalPath, dimensions));
}
/// <summary>
/// Gets the cached local file for a given URL path.
/// </summary>
/// <param name="urlPath">The URL path.</param>
/// <param name="localization">The Localization.</param>
/// <returns>The path to the local file.</returns>
internal string GetCachedFile(string urlPath, Localization localization)
{
string localFilePath = GetFilePathFromUrl(urlPath, localization);
using (new Tracer(urlPath, localization, localFilePath))
{
Dimensions dimensions;
urlPath = StripDimensions(urlPath, out dimensions);
string cacheKey = GetCacheKey(urlPath);
DateTime?lastPublishedDate = CacheAgent.Load(cacheKey) as DateTime?;
if (lastPublishedDate == null)
{
IBinaryFactory binaryFactory = DD4TFactoryCache.GetBinaryFactory(localization);
try
{
DateTime lpb = binaryFactory.FindLastPublishedDate(urlPath);
if (lpb != DateTime.MinValue.AddSeconds(1)) // this is the secret code for 'does not exist'
{
lastPublishedDate = lpb;
CacheAgent.Store(cacheKey, "Binary", lastPublishedDate);
}
}
catch (NullReferenceException)
{
//Binary not found, this should return a min date, but theres a bug in DD4T where it throws a NRE
//DO NOTHING - binary removed later
}
catch (Exception ex)
{
Log.Error(ex);
if (File.Exists(localFilePath))
{
//if theres an error connecting, but we still have a version on disk, serve this
return(localFilePath);
}
}
}
if (lastPublishedDate != null)
{
if (File.Exists(localFilePath))
{
if (localization.LastRefresh.CompareTo(lastPublishedDate) < 0)
{
//File has been modified since last application start but we don't care
Log.Debug("Binary with URL '{0}' is modified, but only since last application restart, so no action required", urlPath);
return(localFilePath);
}
FileInfo fi = new FileInfo(localFilePath);
if (fi.Length > 0)
{
DateTime fileModifiedDate = File.GetLastWriteTime(localFilePath);
if (fileModifiedDate.CompareTo(lastPublishedDate) >= 0)
{
Log.Debug("Binary with URL '{0}' is still up to date, no action required", urlPath);
return(localFilePath);
}
}
}
}
// the normal situation (where a binary is still in Tridion and it is present on the file system already and it is up to date) is now covered
// Let's handle the exception situations.
IBinary binary;
try
{
IBinaryFactory binaryFactory = DD4TFactoryCache.GetBinaryFactory(localization);
binaryFactory.TryFindBinary(urlPath, out binary);
}
catch (BinaryNotFoundException)
{
// TryFindBinary throws an Exception if not found ?!
binary = null;
}
catch (Exception ex)
{
throw new DxaException(string.Format("Error loading binary for URL '{0}'", urlPath), ex);
}
//For some reason DD4T sometimes returns a non-null binary with null binary data if it doesnt exist
if (binary == null || binary.BinaryData == null)
{
// Binary does not exist in Tridion, it should be removed from the local file system too
if (File.Exists(localFilePath))
{
CleanupLocalFile(localFilePath);
}
throw new DxaItemNotFoundException(urlPath, localization.LocalizationId);
}
WriteBinaryToFile(binary, localFilePath, dimensions);
return(localFilePath);
}
}
