futtta /
autoptimize
Complex classes like autoptimizeCache often do a lot of different things. To break such a class down, we need to identify a cohesive component within that class. A common approach to find such a component is to look for fields/methods that share the same prefixes, or suffixes. You can also have a look at the cohesion graph to spot any un-connected, or weakly-connected components.
Once you have determined the fields that belong together, you can apply the Extract Class refactoring. If the component makes sense as a sub-class, Extract Subclass is also a candidate, and is often faster.
While breaking up the class, it is a good idea to analyze how other classes use autoptimizeCache, and based on these observations, apply Extract Interface, too.
| 1 | <?php |
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| 10 | class autoptimizeCache |
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| 11 | { |
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| 12 | /** |
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| 13 | * Cache filename. |
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| 14 | * |
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| 15 | * @var string |
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| 16 | */ |
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| 17 | private $filename; |
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| 18 | |||
| 19 | /** |
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| 20 | * Cache directory path (with a trailing slash). |
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| 21 | * |
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| 22 | * @var string |
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| 23 | */ |
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| 24 | private $cachedir; |
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| 25 | |||
| 26 | /** |
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| 27 | * Whether gzipping is done by the web server or us. |
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| 28 | * True => we don't gzip, the web server does it. |
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| 29 | * False => we do it ourselves. |
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| 30 | * |
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| 31 | * @var bool |
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| 32 | */ |
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| 33 | private $nogzip; |
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| 34 | |||
| 35 | /** |
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| 36 | * Ctor. |
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| 37 | * |
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| 38 | * @param string $md5 Hash. |
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| 39 | * @param string $ext Extension. |
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| 40 | */ |
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| 41 | public function __construct( $md5, $ext = 'php' ) |
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| 42 | { |
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| 43 | $this->cachedir = AUTOPTIMIZE_CACHE_DIR; |
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| 44 | $this->nogzip = AUTOPTIMIZE_CACHE_NOGZIP; |
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| 45 | if ( ! $this->nogzip ) { |
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| 46 | $this->filename = AUTOPTIMIZE_CACHEFILE_PREFIX . $md5 . '.php'; |
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| 47 | } else { |
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| 48 | if ( in_array( $ext, array( 'js', 'css' ) ) ) { |
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| 49 | $this->filename = $ext . '/' . AUTOPTIMIZE_CACHEFILE_PREFIX . $md5 . '.' . $ext; |
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| 50 | } else { |
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| 51 | $this->filename = AUTOPTIMIZE_CACHEFILE_PREFIX . $md5 . '.' . $ext; |
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| 52 | } |
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| 53 | } |
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| 54 | } |
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| 55 | |||
| 56 | /** |
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| 57 | * Returns true if the cached file exists on disk. |
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| 58 | * |
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| 59 | * @return bool |
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| 60 | */ |
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| 61 | public function check() |
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| 62 | { |
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| 63 | return file_exists( $this->cachedir . $this->filename ); |
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| 64 | } |
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| 65 | |||
| 66 | /** |
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| 67 | * Returns cache contents if they exist, false otherwise. |
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| 68 | * |
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| 69 | * @return string|false |
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| 70 | */ |
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| 71 | public function retrieve() |
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| 72 | { |
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| 73 | if ( $this->check() ) { |
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| 74 | if ( false == $this->nogzip ) { |
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| 75 | return file_get_contents( $this->cachedir . $this->filename . '.none' ); |
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| 76 | } else { |
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| 77 | return file_get_contents( $this->cachedir . $this->filename ); |
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| 78 | } |
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| 79 | } |
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| 80 | return false; |
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| 81 | } |
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| 82 | |||
| 83 | /** |
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| 84 | * Stores given $data in cache. |
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| 85 | * |
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| 86 | * @param string $data Data to cache. |
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| 87 | * @param string $mime Mimetype. |
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| 88 | * |
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| 89 | * @return void |
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| 90 | */ |
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| 91 | public function cache( $data, $mime ) |
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| 92 | { |
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| 93 | if ( false === $this->nogzip ) { |
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| 94 | // We handle gzipping ourselves. |
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| 95 | $file = 'default.php'; |
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| 96 | $phpcode = file_get_contents( AUTOPTIMIZE_PLUGIN_DIR . 'config/' . $file ); |
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| 97 | $phpcode = str_replace( array( '%%CONTENT%%', 'exit;' ), array( $mime, '' ), $phpcode ); |
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| 98 | |||
| 99 | file_put_contents( $this->cachedir . $this->filename, $phpcode ); |
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| 100 | file_put_contents( $this->cachedir . $this->filename . '.none', $data ); |
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| 101 | } else { |
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| 102 | // Write code to cache without doing anything else. |
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| 103 | file_put_contents( $this->cachedir . $this->filename, $data ); |
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| 104 | if ( apply_filters( 'autoptimize_filter_cache_create_static_gzip', false ) ) { |
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| 105 | // Create an additional cached gzip file. |
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| 106 | file_put_contents( $this->cachedir . $this->filename . '.gz', gzencode( $data, 9, FORCE_GZIP ) ); |
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| 107 | } |
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| 108 | } |
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| 109 | } |
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| 110 | |||
| 111 | /** |
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| 112 | * Get cache filename. |
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| 113 | * |
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| 114 | * @return string |
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| 115 | */ |
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| 116 | public function getname() |
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| 117 | { |
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| 118 | // NOTE: This could've maybe been a do_action() instead, however, |
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| 119 | // that ship has sailed. |
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| 120 | // The original idea here was to provide 3rd party code a hook so that |
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| 121 | // it can "listen" to all the complete autoptimized-urls that the page |
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| 122 | // will emit... Or something to that effect I think? |
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| 123 | apply_filters( 'autoptimize_filter_cache_getname', AUTOPTIMIZE_CACHE_URL . $this->filename ); |
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| 124 | |||
| 125 | return $this->filename; |
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| 126 | } |
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| 127 | |||
| 128 | /** |
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| 129 | * Returns true if given `$file` is considered a valid Autoptimize cache file, |
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| 130 | * false otherwise. |
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| 131 | * |
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| 132 | * @param string $dir Directory name (with a trailing slash). |
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| 133 | * @param string $file Filename. |
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| 134 | * @return bool |
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| 135 | */ |
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| 136 | protected static function is_valid_cache_file( $dir, $file ) |
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| 137 | { |
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| 138 | if ( '.' !== $file && '..' !== $file && |
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| 139 | false !== strpos( $file, AUTOPTIMIZE_CACHEFILE_PREFIX ) && |
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| 140 | is_file( $dir . $file ) ) { |
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| 141 | |||
| 142 | // It's a valid file! |
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| 143 | return true; |
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| 144 | } |
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| 145 | |||
| 146 | // Everything else is considered invalid! |
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| 147 | return false; |
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| 148 | } |
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| 149 | |||
| 150 | /** |
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| 151 | * Clears contents of AUTOPTIMIZE_CACHE_DIR. |
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| 152 | * |
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| 153 | * @return void |
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| 154 | */ |
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| 155 | protected static function clear_cache_classic() |
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| 156 | { |
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| 157 | $contents = self::get_cache_contents(); |
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| 158 | foreach ( $contents as $name => $files ) { |
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| 159 | $dir = rtrim( AUTOPTIMIZE_CACHE_DIR . $name, '/' ) . '/'; |
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| 160 | foreach ( $files as $file ) { |
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| 161 | if ( self::is_valid_cache_file( $dir, $file ) ) { |
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| 162 | @unlink( $dir . $file ); // @codingStandardsIgnoreLine |
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| 163 | } |
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| 164 | } |
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| 165 | } |
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| 166 | |||
| 167 | @unlink( AUTOPTIMIZE_CACHE_DIR . '/.htaccess' ); // @codingStandardsIgnoreLine |
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| 168 | } |
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| 169 | |||
| 170 | /** |
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| 171 | * Recursively deletes the specified pathname (file/directory) if possible. |
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| 172 | * Returns true on success, false otherwise. |
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| 173 | * |
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| 174 | * @param string $pathname Pathname to remove. |
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| 175 | * |
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| 176 | * @return bool |
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| 177 | */ |
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| 178 | protected static function rmdir( $pathname ) |
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| 179 | { |
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| 180 | $files = self::get_dir_contents( $pathname ); |
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| 181 | foreach ( $files as $file ) { |
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| 182 | $path = $pathname . '/' . $file; |
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| 183 | if ( is_dir( $path ) ) { |
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| 184 | self::rmdir( $path ); |
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| 185 | } else { |
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| 186 | unlink( $path ); |
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| 187 | } |
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| 188 | } |
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| 189 | |||
| 190 | return rmdir( $pathname ); |
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| 191 | } |
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| 192 | |||
| 193 | /** |
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| 194 | * Clears contents of AUTOPTIMIZE_CACHE_DIR by renaming the current |
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| 195 | * cache directory into a new one with a unique name and then |
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| 196 | * re-creating the default (empty) cache directory. |
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| 197 | * |
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| 198 | * @return bool Returns true when everything is done successfully, false otherwise. |
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| 199 | */ |
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| 200 | protected static function clear_cache_via_rename() |
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| 201 | { |
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| 202 | $ok = false; |
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| 203 | $dir = self::get_pathname_base(); |
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| 204 | $new_name = self::get_unique_name(); |
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| 205 | |||
| 206 | // Makes sure the new pathname is on the same level... |
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| 207 | $new_pathname = dirname( $dir ) . '/' . $new_name; |
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| 208 | $renamed = @rename( $dir, $new_pathname ); // @codingStandardsIgnoreLine |
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| 209 | |||
| 210 | // When renamed, re-create the default cache directory back so it's |
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| 211 | // available again... |
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| 212 | if ( $renamed ) { |
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| 213 | $ok = self::cacheavail(); |
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| 214 | } |
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| 215 | |||
| 216 | return $ok; |
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| 217 | } |
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| 218 | |||
| 219 | /** |
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| 220 | * Returns true when advanced cache clearing is enabled. |
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| 221 | * |
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| 222 | * @return bool |
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| 223 | */ |
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| 224 | public static function advanced_cache_clear_enabled() |
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| 225 | { |
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| 226 | return apply_filters( 'autoptimize_filter_cache_clear_advanced', false ); |
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| 227 | } |
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| 228 | |||
| 229 | /** |
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| 230 | * Returns a (hopefully) unique new cache folder name for renaming purposes. |
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| 231 | * |
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| 232 | * @return string |
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| 233 | */ |
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| 234 | protected static function get_unique_name() |
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| 235 | { |
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| 236 | $prefix = self::get_advanced_cache_clear_prefix(); |
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| 237 | $new_name = uniqid( $prefix, true ); |
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| 238 | |||
| 239 | return $new_name; |
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| 240 | } |
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| 241 | |||
| 242 | /** |
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| 243 | * Get cache prefix name used in advanced cache clearing mode. |
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| 244 | * |
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| 245 | * @return string |
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| 246 | */ |
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| 247 | protected static function get_advanced_cache_clear_prefix() |
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| 248 | { |
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| 249 | $pathname = self::get_pathname_base(); |
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| 250 | $basename = basename( $pathname ); |
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| 251 | $prefix = $basename . '-'; |
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| 252 | |||
| 253 | return $prefix; |
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| 254 | } |
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| 255 | |||
| 256 | /** |
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| 257 | * Returns an array of file and directory names found within |
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| 258 | * the given $pathname without '.' and '..' elements. |
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| 259 | * |
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| 260 | * @param string $pathname Pathname. |
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| 261 | * |
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| 262 | * @return array |
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| 263 | */ |
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| 264 | protected static function get_dir_contents( $pathname ) |
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| 265 | { |
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| 266 | return array_slice( scandir( $pathname ), 2 ); |
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| 267 | } |
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| 268 | |||
| 269 | /** |
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| 270 | * Wipes directories which were created as part of the fast cache clearing |
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| 271 | * routine (which renames the current cache directory into a new one with |
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| 272 | * a custom-prefixed unique name). |
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| 273 | * |
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| 274 | * @return bool |
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| 275 | */ |
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| 276 | public static function delete_advanced_cache_clear_artifacts() |
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| 277 | { |
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| 278 | $dir = self::get_pathname_base(); |
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| 279 | $prefix = self::get_advanced_cache_clear_prefix(); |
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| 280 | $parent = dirname( $dir ); |
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| 281 | $ok = false; |
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| 282 | |||
| 283 | // Returns the list of files without '.' and '..' elements. |
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| 284 | $files = self::get_dir_contents( $parent ); |
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| 285 | foreach ( $files as $file ) { |
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| 286 | $path = $parent . '/' . $file; |
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| 287 | $prefixed = ( false !== strpos( $path, $prefix ) ); |
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| 288 | // Removing only our own (prefixed) directories... |
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| 289 | if ( is_dir( $path ) && $prefixed ) { |
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| 290 | $ok = self::rmdir( $path ); |
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| 291 | } |
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| 292 | } |
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| 293 | |||
| 294 | return $ok; |
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| 295 | } |
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| 296 | |||
| 297 | /** |
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| 298 | * Returns the cache directory pathname used. |
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| 299 | * Done as a function so we canSlightly different |
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| 300 | * if multisite is used and `autoptimize_separate_blog_caches` filter |
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| 301 | * is used. |
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| 302 | * |
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| 303 | * @return string |
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| 304 | */ |
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| 305 | public static function get_pathname() |
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| 306 | { |
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| 307 | $pathname = self::get_pathname_base(); |
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| 308 | |||
| 309 | if ( is_multisite() && apply_filters( 'autoptimize_separate_blog_caches', true ) ) { |
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| 310 | $blog_id = get_current_blog_id(); |
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| 311 | $pathname .= $blog_id . '/'; |
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| 312 | } |
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| 313 | |||
| 314 | return $pathname; |
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| 315 | } |
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| 316 | |||
| 317 | /** |
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| 318 | * Returns the base path of our cache directory. |
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| 319 | * |
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| 320 | * @return string |
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| 321 | */ |
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| 322 | protected static function get_pathname_base() |
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| 323 | { |
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| 324 | $pathname = WP_CONTENT_DIR . AUTOPTIMIZE_CACHE_CHILD_DIR; |
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| 325 | |||
| 326 | return $pathname; |
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| 327 | } |
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| 328 | |||
| 329 | /** |
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| 330 | * Deletes everything from the cache directories. |
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| 331 | * |
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| 332 | * @param bool $propagate Whether to trigger additional actions when cache is purged. |
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| 333 | * |
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| 334 | * @return bool |
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| 335 | */ |
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| 336 | public static function clearall( $propagate = true ) |
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| 337 | { |
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| 338 | if ( ! self::cacheavail() ) { |
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| 339 | return false; |
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| 340 | } |
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| 341 | |||
| 342 | // TODO/FIXME: If cache is big, switch to advanced/new cache clearing automatically? |
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| 343 | if ( self::advanced_cache_clear_enabled() ) { |
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| 344 | self::clear_cache_via_rename(); |
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| 345 | } else { |
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| 346 | self::clear_cache_classic(); |
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| 347 | } |
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| 348 | |||
| 349 | // Remove the transient so it gets regenerated... |
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| 350 | delete_transient( 'autoptimize_stats' ); |
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| 351 | |||
| 352 | // Cache was just purged, clear page cache and allow others to hook into our purging... |
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| 353 | if ( true === $propagate ) { |
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| 354 | if ( ! function_exists( 'autoptimize_do_cachepurged_action' ) ) { |
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| 355 | function autoptimize_do_cachepurged_action() { |
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| 358 | } |
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| 359 | add_action( 'shutdown', 'autoptimize_do_cachepurged_action', 11 ); |
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| 360 | add_action( 'autoptimize_action_cachepurged', array( 'autoptimizeCache', 'flushPageCache' ), 10, 0 ); |
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| 361 | } |
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| 362 | |||
| 363 | // Warm cache (part of speedupper)! |
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| 364 | if ( apply_filters( 'autoptimize_filter_speedupper', true ) ) { |
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| 365 | $url = site_url() . '/?ao_speedup_cachebuster=' . rand( 1, 100000 ); |
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| 366 | $cache = @wp_remote_get( $url ); // @codingStandardsIgnoreLine |
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| 367 | unset( $cache ); |
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| 368 | } |
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| 369 | |||
| 370 | return true; |
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| 371 | } |
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| 372 | |||
| 373 | /** |
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| 374 | * Wrapper for clearall but with false param |
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| 375 | * to ensure the event is not propagated to others |
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| 376 | * through our own hooks (to avoid infinite loops). |
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| 377 | * |
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| 378 | * @return bool |
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| 379 | */ |
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| 380 | public static function clearall_actionless() |
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| 384 | |||
| 385 | /** |
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| 386 | * Returns the contents of our cache dirs. |
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| 387 | * |
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| 388 | * @return array |
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| 389 | */ |
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| 390 | protected static function get_cache_contents() |
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| 400 | |||
| 401 | /** |
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| 402 | * Returns stats about cached contents. |
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| 403 | * |
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| 404 | * @return array |
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| 405 | */ |
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| 406 | public static function stats() |
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| 429 | |||
| 430 | /** |
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| 431 | * Performs a scan of cache directory contents and returns an array |
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| 432 | * with 3 values: count, size, timestamp. |
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| 433 | * count = total number of found files |
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| 434 | * size = total filesize (in bytes) of found files |
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| 435 | * timestamp = unix timestamp when the scan was last performed/finished. |
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| 436 | * |
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| 437 | * @return array |
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| 438 | */ |
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| 439 | protected static function stats_scan() |
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| 472 | |||
| 473 | /** |
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| 474 | * Ensures the cache directory exists, is writeable and contains the |
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| 475 | * required .htaccess files. |
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| 476 | * Returns false in case it fails to ensure any of those things. |
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| 477 | * |
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| 478 | * @return bool |
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| 479 | */ |
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| 480 | public static function cacheavail() |
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| 563 | |||
| 564 | /** |
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| 565 | * Ensures the specified `$dir` exists and is writeable. |
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| 566 | * Returns false if that's not the case. |
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| 567 | * |
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| 568 | * @param string $dir Directory to check/create. |
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| 569 | * |
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| 570 | * @return bool |
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| 571 | */ |
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| 572 | protected static function check_cache_dir( $dir ) |
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| 595 | |||
| 596 | /** |
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| 597 | * Flushes as many page cache plugin's caches as possible. |
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| 598 | * |
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| 599 | * @return void |
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| 600 | */ |
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| 601 | // @codingStandardsIgnoreStart |
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| 602 | public static function flushPageCache() |
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| 660 | // @codingStandardsIgnoreEnd |
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| 661 | } |
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| 662 |
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When comparing two booleans, it is generally considered safer to use the strict comparison operator.