Limit cache size to 256 results by default (#127)

Limit cache size to 256 results by default

Author: WyriHaximus

composer.json

@@ -5,7 +5,7 @@
     "license": "MIT",
     "require": {
         "php": ">=5.3.0",
-        "react/cache": "^1.0 || ^0.6 || ^0.5 || ^0.4 || ^0.3",
+        "react/cache": "^1.0 || ^0.6 || ^0.5",
         "react/event-loop": "^1.0 || ^0.5 || ^0.4 || ^0.3.5",
         "react/promise": "^2.1 || ^1.2.1",
         "react/promise-timer": "^1.2",

src/Query/RecordCache.php

@@ -37,7 +37,7 @@ public function lookup(Query $query)
         return $this->cache
             ->get($id)
             ->then(function ($value) use ($query, $expiredAt) {
-                // cache 0.5+ resolves with null on cache miss, return explicit cache miss here
+                // reject on cache miss
                 if ($value === null) {
                     return Promise\reject();
                 }
@@ -86,17 +86,13 @@ public function storeRecord($currentTime, Record $record)
             ->get($id)
             ->then(
                 function ($value) {
+                    // return empty bag on cache miss
                     if ($value === null) {
-                        // cache 0.5+ cache miss resolves with null, return empty bag here
                         return new RecordBag();
                     }
 
                     // reuse existing bag on cache hit to append new record to it
                     return unserialize($value);
-                },
-                function ($e) {
-                    // legacy cache < 0.5 cache miss rejects promise, return empty bag here
-                    return new RecordBag();
                 }
             )
             ->then(function (RecordBag $recordBag) use ($id, $currentTime, $record, $cache) {

src/Resolver/Factory.php

@@ -27,8 +27,9 @@ public function create($nameserver, LoopInterface $loop)
 
     public function createCached($nameserver, LoopInterface $loop, CacheInterface $cache = null)
     {
+        // default to keeping maximum of 256 responses in cache unless explicitly given
         if (!($cache instanceof CacheInterface)) {
-            $cache = new ArrayCache();
+            $cache = new ArrayCache(256);
         }
 
         $nameserver = $this->addPortToServerIfMissing($nameserver);

tests/Query/RecordCacheTest.php

@@ -17,7 +17,7 @@ class RecordCacheTest extends TestCase
      * @covers React\Dns\Query\RecordCache
      * @test
      */
-    public function lookupOnNewCacheMissShouldReturnNull()
+    public function lookupOnCacheMissShouldReturnNull()
     {
         $query = new Query('igor.io', Message::TYPE_A, Message::CLASS_IN, 1345656451);
 
@@ -30,23 +30,6 @@ public function lookupOnNewCacheMissShouldReturnNull()
         $this->assertInstanceOf('React\Promise\RejectedPromise', $promise);
     }
 
-    /**
-     * @covers React\Dns\Query\RecordCache
-     * @test
-     */
-    public function lookupOnLegacyCacheMissShouldReturnNull()
-    {
-        $query = new Query('igor.io', Message::TYPE_A, Message::CLASS_IN, 1345656451);
-
-        $base = $this->getMockBuilder('React\Cache\CacheInterface')->getMock();
-        $base->expects($this->once())->method('get')->willReturn(\React\Promise\reject());
-
-        $cache = new RecordCache($base);
-        $promise = $cache->lookup($query);
-
-        $this->assertInstanceOf('React\Promise\RejectedPromise', $promise);
-    }
-
     /**
      * @covers React\Dns\Query\RecordCache
      * @test
@@ -68,7 +51,7 @@ public function storeRecordPendingCacheDoesNotSetCache()
      * @covers React\Dns\Query\RecordCache
      * @test
      */
-    public function storeRecordOnNewCacheMissSetsCache()
+    public function storeRecordOnCacheMissSetsCache()
     {
         $query = new Query('igor.io', Message::TYPE_A, Message::CLASS_IN, 1345656451);
 
@@ -80,22 +63,6 @@ public function storeRecordOnNewCacheMissSetsCache()
         $cache->storeRecord($query->currentTime, new Record('igor.io', Message::TYPE_A, Message::CLASS_IN, 3600, '178.79.169.131'));
     }
 
-    /**
-     * @covers React\Dns\Query\RecordCache
-     * @test
-     */
-    public function storeRecordOnOldCacheMissSetsCache()
-    {
-        $query = new Query('igor.io', Message::TYPE_A, Message::CLASS_IN, 1345656451);
-
-        $base = $this->getMockBuilder('React\Cache\CacheInterface')->getMock();
-        $base->expects($this->once())->method('get')->willReturn(\React\Promise\reject());
-        $base->expects($this->once())->method('set')->with($this->isType('string'), $this->isType('string'));
-
-        $cache = new RecordCache($base);
-        $cache->storeRecord($query->currentTime, new Record('igor.io', Message::TYPE_A, Message::CLASS_IN, 3600, '178.79.169.131'));
-    }
-
     /**
     * @covers React\Dns\Query\RecordCache
     * @test