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<?php |
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/** |
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* |
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* |
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* @author Mark Guinn <[email protected]> |
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* @date 01.10.2014 |
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* @package cloudassets |
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*/ |
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class CloudFileExtension extends DataExtension |
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{ |
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private static $db = array( |
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'CloudStatus' => "Enum('Local,Live,Error','Local')", |
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'CloudSize' => 'Int', |
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'CloudMetaJson' => 'Text', // saves any bucket or file-type specific information |
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); |
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private $inUpdate = false; |
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/** |
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* Handle renames |
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*/ |
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public function onBeforeWrite() |
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{ |
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$bucket = CloudAssets::inst()->map($this->owner->getFilename()); |
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if ($bucket) { |
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if (!$this->owner->isChanged('Filename')) { |
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return; |
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} |
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$changedFields = $this->owner->getChangedFields(); |
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$pathBefore = $changedFields['Filename']['before']; |
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$pathAfter = $changedFields['Filename']['after']; |
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// If the file or folder didn't exist before, don't rename - its created |
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if (!$pathBefore) { |
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return; |
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} |
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// Tell the remote to rename the file (or delete and recreate or whatever) |
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if ($this->owner->hasMethod('onBeforeCloudRename')) { |
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$this->owner->onAfterCloudRename($pathBefore, $pathAfter); |
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} |
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CloudAssets::inst()->getLogger()->info("CloudAssets: Renaming $pathBefore to $pathAfter"); |
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$bucket->rename($this->owner, $pathBefore, $pathAfter); |
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if ($this->owner->hasMethod('onAfterCloudRename')) { |
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$this->owner->onAfterCloudRename($pathBefore, $pathAfter); |
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} |
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} |
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} |
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/** |
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* Update cloud status any time the file is written |
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*/ |
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public function onAfterWrite() |
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{ |
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$this->updateCloudStatus(); |
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} |
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/** |
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* Delete the file from the cloud (if it was ever there) |
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*/ |
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public function onAfterDelete() |
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{ |
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$bucket = CloudAssets::inst()->map($this->owner->getFilename()); |
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if ($bucket && !Config::inst()->get('CloudAssets', 'uploads_disabled')) { |
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if ($this->owner->hasMethod('onBeforeCloudDelete')) { |
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$this->owner->onBeforeCloudDelete(); |
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} |
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try { |
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CloudAssets::inst()->getLogger()->info("CloudAssets: deleting {$this->owner->getFilename()}"); |
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$bucket->delete($this->owner); |
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} catch (Exception $e) { |
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CloudAssets::inst()->getLogger()->error("CloudAssets: Failed bucket delete: " . $e->getMessage() . " for " . $this->owner->getFullPath()); |
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} |
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if ($this->owner->hasMethod('onAfterCloudDelete')) { |
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$this->owner->onAfterCloudDelete(); |
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} |
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} |
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} |
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/** |
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* Performs two functions: |
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* 1. Wraps this object in CloudFile (etc) by changing the classname if it should be and is not |
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* 2. Uploads the file to the cloud storage if it doesn't contain the placeholder |
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* |
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* @return File |
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*/ |
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public function updateCloudStatus() |
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{ |
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if ($this->inUpdate) { |
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return; |
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} |
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$this->inUpdate = true; |
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$cloud = CloudAssets::inst(); |
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// does this file fall under a cloud bucket? |
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$bucket = $cloud->map($this->owner->getFilename()); |
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if ($bucket) { |
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// does this file need to be wrapped? |
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$wrapClass = $cloud->getWrapperClass($this->owner->ClassName); |
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if (!empty($wrapClass)) { |
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if ($wrapClass != $this->owner->ClassName) { |
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$cloud->getLogger()->debug("CloudAssets: wrapping {$this->owner->ClassName} to $wrapClass. ID={$this->owner->ID}"); |
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$this->owner->ClassName = $wrapClass; |
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$this->owner->write(); |
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$wrapped = DataObject::get($wrapClass)->byID($this->owner->ID); |
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if ($wrapped->hasMethod('onAfterCloudWrap')) { |
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$wrapped->onAfterCloudWrap(); |
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} |
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} else { |
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$wrapped = $this->owner; |
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} |
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// does this file need to be uploaded to storage? |
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if ($wrapped->canBeInCloud() && $wrapped->isCloudPutNeeded() && !Config::inst()->get('CloudAssets', 'uploads_disabled')) { |
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try { |
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if ($wrapped->hasMethod('onBeforeCloudPut')) { |
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$wrapped->onBeforeCloudPut(); |
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} |
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$cloud->getLogger()->debug("CloudAssets: uploading file ".$wrapped->getFilename()); |
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$bucket->put($wrapped); |
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$wrapped->setCloudMeta('LastPut', time()); |
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$wrapped->CloudStatus = 'Live'; |
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$wrapped->CloudSize = filesize($this->owner->getFullPath()); |
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$wrapped->write(); |
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$wrapped->convertToPlaceholder(); |
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if ($wrapped->hasMethod('onAfterCloudPut')) { |
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$wrapped->onAfterCloudPut(); |
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} |
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} catch (Exception $e) { |
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$wrapped->CloudStatus = 'Error'; |
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$wrapped->write(); |
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$cloud->getLogger()->error("CloudAssets: Failed bucket upload: " . $e->getMessage() . " for " . $wrapped->getFullPath()); |
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// Fail silently for now. This will cause the local copy to be served. |
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} |
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} elseif ($wrapped->CloudStatus !== 'Live' && $wrapped->containsPlaceholder()) { |
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// If this is a duplicate file, update the status |
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// This shouldn't happen ever and won't happen often but when it does this will be helpful |
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$dup = File::get()->filter(array( |
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'Filename' => $wrapped->Filename, |
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'CloudStatus' => 'Live', |
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))->first(); |
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if ($dup && $dup->exists()) { |
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$cloud->getLogger()->warn("CloudAssets: fixing status for duplicate file: {$wrapped->ID} and {$dup->ID}"); |
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$wrapped->CloudStatus = $dup->CloudStatus; |
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$wrapped->CloudSize = $dup->CloudSize; |
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$wrapped->CloudMetaJson = $dup->CloudMetaJson; |
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$wrapped->write(); |
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} |
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} |
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$this->inUpdate = false; |
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return $wrapped; |
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} |
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} |
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$this->inUpdate = false; |
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return $this->owner; |
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} |
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/** |
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* @return bool |
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*/ |
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public function canBeInCloud() |
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{ |
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if ($this->owner instanceof Folder) { |
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return false; |
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} |
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if (!file_exists($this->owner->getFullPath())) { |
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return false; |
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} |
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return true; |
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} |
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/** |
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* @return bool |
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*/ |
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public function containsPlaceholder() |
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{ |
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$placeholder = Config::inst()->get('CloudAssets', 'file_placeholder'); |
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$path = $this->owner->getFullPath(); |
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// check the size first to avoid reading crazy huge files into memory |
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return (file_exists($path) && filesize($path) == strlen($placeholder) && file_get_contents($path) == $placeholder); |
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} |
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/** |
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* Wipes out the contents of this file and replaces with placeholder text |
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*/ |
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public function convertToPlaceholder() |
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{ |
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$bucket = $this->getCloudBucket(); |
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if ($bucket && !$bucket->isLocalCopyEnabled()) { |
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$path = $this->owner->getFullPath(); |
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CloudAssets::inst()->getLogger()->debug("CloudAssets: converting $path to placeholder"); |
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Filesystem::makeFolder(dirname($path)); |
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file_put_contents($path, Config::inst()->get('CloudAssets', 'file_placeholder')); |
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} |
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return $this->owner; |
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} |
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/** |
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* @return CloudBucket |
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*/ |
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public function getCloudBucket() |
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{ |
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return CloudAssets::inst()->map($this->owner); |
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} |
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/** |
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* @param int $linkType [optional] - see CloudBucket::LINK_XXX constants |
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* @return string |
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*/ |
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public function getCloudURL($linkType = CloudBucket::LINK_SMART) |
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{ |
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$bucket = $this->getCloudBucket(); |
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return $bucket ? $bucket->getLinkFor($this->owner, $linkType) : ''; |
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} |
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/** |
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* @param string $key [optional] - if not present returns the whole array |
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* @return array |
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*/ |
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public function getCloudMeta($key = null) |
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{ |
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$data = json_decode($this->owner->CloudMetaJson, true); |
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if (empty($data) || !is_array($data)) { |
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$data = array(); |
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} |
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if (!empty($key)) { |
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return isset($data[$key]) ? $data[$key] : null; |
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} else { |
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return $data; |
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} |
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} |
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/** |
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* @param string|array $key - passing an array as the first argument replaces the meta data entirely |
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* @param mixed $val |
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* @return File - chainable |
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*/ |
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public function setCloudMeta($key, $val = null) |
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{ |
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if (is_array($key)) { |
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$data = $key; |
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} else { |
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$data = $this->getCloudMeta(); |
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$data[$key] = $val; |
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} |
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$this->owner->CloudMetaJson = json_encode($data); |
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return $this->owner; |
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} |
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/** |
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* If this file is stored in the cloud, downloads the cloud |
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* copy and replaces whatever is local. |
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*/ |
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public function downloadFromCloud() |
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{ |
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if ($this->owner->CloudStatus === 'Live') { |
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$bucket = $this->owner->getCloudBucket(); |
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if ($bucket) { |
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$contents = $bucket->getContents($this->owner); |
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$path = $this->owner->getFullPath(); |
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Filesystem::makeFolder(dirname($path)); |
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CloudAssets::inst()->getLogger()->debug("CloudAssets: downloading $path from cloud (size=".strlen($contents).")"); |
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// if there was an error and we overwrote the local file with empty or null, it could delete the remote |
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// file as well. Better to err on the side of not writing locally when we should than that. |
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if (!empty($contents)) { |
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file_put_contents($path, $contents); |
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} |
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} |
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} |
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} |
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/** |
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* If the file is present in the database and the cloud but not |
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* locally, create a placeholder for it. This can happen in a lot |
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* of cases such as load balanced servers and local development. |
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*/ |
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public function createLocalIfNeeded() |
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{ |
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if ($this->owner->CloudStatus === 'Live') { |
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$bucket = $this->getCloudBucket(); |
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if ($bucket && $bucket->isLocalCopyEnabled()) { |
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if (!file_exists($this->owner->getFullPath()) || $this->containsPlaceholder()) { |
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try { |
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$this->downloadFromCloud(); |
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} catch (Exception $e) { |
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// I'm not sure what the correct behaviour is here |
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// Pretty sure it'd be better to have a broken image |
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// link than a 500 error though. |
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CloudAssets::inst()->getLogger()->error("CloudAssets: Failed bucket download: " . $e->getMessage() . " for " . $this->owner->getFullPath()); |
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} |
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} |
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} else { |
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if (!file_exists($this->owner->getFullPath())) { |
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$this->convertToPlaceholder(); |
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} |
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} |
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} |
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} |
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/** |
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* @return bool |
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*/ |
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public function isCloudPutNeeded() |
331
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{ |
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// we never want to upload the placeholder |
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if ($this->containsPlaceholder()) { |
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return false; |
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} |
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// we never want to upload an empty file |
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$path = $this->owner->getFullPath(); |
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if (!file_exists($path)) { |
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return false; |
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} |
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// we always want to upload if it's the first time |
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$lastPut = $this->getCloudMeta('LastPut'); |
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if (!$lastPut) { |
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return true; |
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} |
348
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349
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// additionally, we want to upload if the file has been changed or replaced |
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$mtime = filemtime($path); |
351
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if ($mtime > $lastPut) { |
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return true; |
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} |
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return false; |
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} |
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359
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/** |
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* Returns true if the local file is not available |
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* @return bool |
362
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*/ |
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public function isLocalMissing() |
364
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{ |
365
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return !file_exists($this->owner->getFullPath()) || $this->containsPlaceholder(); |
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} |
367
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} |
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The class complexity is the sum of the complexity of all methods. A very high value is usually an indication that your class does not follow the single reponsibility principle and does more than one job.
Some resources for further reading:
You can also find more detailed suggestions for refactoring in the “Code” section of your repository.