Bring config keys usecache and storecache usage into the cache class

imdb_cache.class.php

@@ -6,7 +6,7 @@
  * File caching
  * Caches files to disk in config->cachedir optionally gzipping if config->usezip
  *
- * Config keys used: cachedir cache_expire usezip converttozip
+ * Config keys used: cachedir cache_expire usezip converttozip usecache storecache
  */
 class imdb_cache {
 
@@ -24,11 +24,11 @@ public function __construct(mdb_config $config, imdb_logger $logger) {
     $this->config = $config;
     $this->logger = $logger;
 
-    if (!is_dir($this->config->cachedir)) {
+    if (($this->config->usecache || $this->config->storecache) && !is_dir($this->config->cachedir)) {
       $this->logger->critical("[Cache] Configured cache directory [{$this->config->cachedir}] does not exist!");
       throw new imdb_exception("[Cache] Configured cache directory [{$this->config->cachedir}] does not exist!");
     }
-    if (!is_writable($this->config->cachedir)) {
+    if ($this->config->storecache && !is_writable($this->config->cachedir)) {
       $this->logger->critical("[Cache] Configured cache directory [{$this->config->cachedir}] lacks write permission!");
       throw new imdb_exception("[Cache] Configured cache directory [{$this->config->cachedir}] lacks write permission!");
     }
@@ -37,15 +37,19 @@ public function __construct(mdb_config $config, imdb_logger $logger) {
   /**
    * Get string value of $key from cache
    * @param string $key
-   * @return string|boolean false on failure / cache miss
+   * @return string|null null on failure / cache miss
    */
   public function get($key) {
+    if (!$this->config->usecache) {
+      return null;
+    }
+
     $cleanKey = $this->sanitiseKey($key);
 
     $fname = $this->config->cachedir . '/' . $cleanKey;
     if (!file_exists($fname)) {
       $this->logger->debug("[Cache] Cache miss for [$key]");
-      return false;
+      return null;
     }
     $this->logger->debug("[Cache] Cache hit for [$key]");
     if ($this->config->usezip) {
@@ -75,6 +79,10 @@ public function get($key) {
    * @return bool successful?
    */
   public function set($key, $value) {
+    if (!$this->config->storecache) {
+      return false;
+    }
+
     $cleanKey = $this->sanitiseKey($key);
 
     $fname = $this->config->cachedir . '/' . $cleanKey;

imdb_page.class.php

@@ -85,18 +85,10 @@ protected function requestPage($url) {
   }
 
   protected function getFromCache() {
-    if (!$this->config->usecache) {
-      return '';
-    }
-
     return $this->cache->get($this->getCacheKey());
   }
 
   protected function saveToCache() {
-    if (!$this->config->storecache) {
-      return;
-    }
-
     $this->cache->set($this->getCacheKey(), $this->pageString);
   }
 

tests/imdbTest.php

@@ -27,6 +27,8 @@ public function testConstruct_from_ini_constructed_config() {
         $imdb = new imdb('0133093', $config);
         $this->assertEquals('test.local', $imdb->imdbsite);
         $this->assertEquals('/somefolder', $imdb->cachedir);
+        $this->assertEquals(false, $imdb->storecache);
+        $this->assertEquals(false, $imdb->usecache);
     }
 
     // @TODO tests for other types

tests/imdb_cacheTest.php

@@ -5,6 +5,13 @@
 require_once dirname(__FILE__) . '/../mdb_config.class.php';
 
 class imdb_cacheTest extends PHPUnit_Framework_TestCase {
+
+  private function getConfig() {
+    $config = new mdb_config();
+    $config->cachedir = realpath(dirname(__FILE__).'/cache') . '/';
+    return $config;
+  }
+
   /**
    * @expectedException imdb_exception
    */
@@ -25,10 +32,30 @@ public function test_configured_directory_non_writeable_causes_exception() {
     new imdb_cache($config, new imdb_logger());
   }
 
+  public function test_get_returns_null_when_usecache_is_false() {
+    $config = $this->getConfig();
+    $cache = new imdb_cache($config, new imdb_logger());
+
+    $cache->set('usecacheTest', 'value');
+
+    $this->assertEquals('value', $cache->get('usecacheTest'));
+    $config->usecache = false;
+    $this->assertEquals(null, $cache->get('usecacheTest'));
+  }
+
+  public function test_set_does_not_cache_when_storecache_is_false() {
+    $config = $this->getConfig();
+    $config->storecache = false;
+    $cache = new imdb_cache($config, new imdb_logger());
+
+    $cache->set('storecacheTest', 'value');
+
+    $this->assertEquals(null, $cache->get('storecacheTest'));
+  }
+
   public function test_set_get_zipped() {
-    $config = new mdb_config();
+    $config = $this->getConfig();
     $config->usezip = true;
-    $config->cachedir = realpath(dirname(__FILE__).'/cache') . '/';
     $cache = new imdb_cache($config, new imdb_logger());
 
     $setOk = $cache->set('test1', 'a value');
@@ -39,9 +66,8 @@ public function test_set_get_zipped() {
   }
 
   public function test_set_get_notzipped() {
-    $config = new mdb_config();
+    $config = $this->getConfig();
     $config->usezip = false;
-    $config->cachedir = realpath(dirname(__FILE__).'/cache') . '/';
     $cache = new imdb_cache($config, new imdb_logger());
 
     $setOk = $cache->set('test2', 'a value');

tests/resources/test.ini

@@ -1,2 +1,4 @@
 imdbsite = "test.local"
 cachedir = /somefolder
+storecache = false
+usecache = false