fixed redis response parsing for large data

fixes #743

framework/yii/db/redis/Connection.php

@@ -371,7 +371,7 @@ class Connection extends Component
 		array_unshift($params, $name);
 		$command = '*' . count($params) . "\r\n";
 		foreach($params as $arg) {
-			$command .= '$' . strlen($arg) . "\r\n" . $arg . "\r\n";
+			$command .= '$' . mb_strlen($arg, '8bit') . "\r\n" . $arg . "\r\n";
 		}
 
 		\Yii::trace("Executing Redis Command: {$name}", __CLASS__);
@@ -386,7 +386,7 @@ class Connection extends Component
 			throw new Exception("Failed to read from socket.\nRedis command was: " . $command);
 		}
 		$type = $line[0];
-		$line = substr($line, 1, -2);
+		$line = mb_substr($line, 1, -2, '8bit');
 		switch($type)
 		{
 			case '+': // Status reply
@@ -400,10 +400,16 @@ class Connection extends Component
 				if ($line == '-1') {
 					return null;
 				}
-				if(($data = fread($this->_socket, $line + 2))===false) {
+				$length = $line + 2;
+				$data = '';
+				while ($length > 0) {
+					if(($block = fread($this->_socket, $line + 2)) === false) {
 						throw new Exception("Failed to read from socket.\nRedis command was: " . $command);
 					}
-				return substr($data, 0, -2);
+					$data .= $block;
+					$length -= mb_strlen($block, '8bit');
+				}
+				return mb_substr($data, 0, -2, '8bit');
 			case '*': // Multi-bulk replies
 				$count = (int) $line;
 				$data = array();

tests/unit/framework/caching/RedisCacheTest.php

@@ -7,7 +7,7 @@ use yiiunit\TestCase;
 /**
  * Class for testing redis cache backend
  */
-class RedisCacheTest extends CacheTest
+class RedisCacheTest extends CacheTestCase
 {
 	private $_cacheInstance = null;
 
@@ -20,6 +20,7 @@ class RedisCacheTest extends CacheTest
 			'hostname' => 'localhost',
 			'port' => 6379,
 			'database' => 0,
+			'dataTimeout' => 0.1,
 		);
 		$dsn = $config['hostname'] . ':' .$config['port'];
 		if(!@stream_socket_client($dsn, $errorNumber, $errorDescription, 0.5)) {
@@ -42,4 +43,41 @@ class RedisCacheTest extends CacheTest
 		usleep(300000);
 		$this->assertFalse($cache->get('expire_test_ms'));
 	}
+
+	/**
+	 * Store a value that is 2 times buffer size big
+	 * https://github.com/yiisoft/yii2/issues/743
+	 */
+	public function testLargeData()
+	{
+		$cache = $this->getCacheInstance();
+
+		$data=str_repeat('XX',8192); // http://www.php.net/manual/en/function.fread.php
+		$key='bigdata1';
+
+		$this->assertFalse($cache->get($key));
+		$cache->set($key,$data);
+		$this->assertTrue($cache->get($key)===$data);
+
+		// try with multibyte string
+		$data=str_repeat('ЖЫ',8192); // http://www.php.net/manual/en/function.fread.php
+		$key='bigdata2';
+
+		$this->assertFalse($cache->get($key));
+		$cache->set($key,$data);
+		$this->assertTrue($cache->get($key)===$data);
+	}
+
+	public function testMultiByteGetAndSet()
+	{
+		$cache = $this->getCacheInstance();
+
+		$data=array('abc'=>'ежик',2=>'def');
+		$key='data1';
+
+		$this->assertFalse($cache->get($key));
+		$cache->set($key,$data);
+		$this->assertTrue($cache->get($key)===$data);
+	}
+
 }