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<?php |
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namespace Phloppy\Stream; |
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use Phloppy\Cache\CacheInterface; |
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use Phloppy\Cache\MemoryCache; |
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use Phloppy\Client\Node; |
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use Phloppy\Exception\ConnectException; |
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use Phloppy\NodeInfo; |
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use Psr\Log\LoggerInterface; |
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/** |
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* Node Connection Pool with the ability to cache cluster nodes. |
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* |
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* After establishing the connection with one of the provided node addresses a HELLO command will be |
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* issued to retrieve all available nodes. The information will be stored in the provided CacheInterface implementation |
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* and retrieved the next time when a connect() is issued. |
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*/ |
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class CachingPool extends Pool |
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{ |
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/** |
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* @var CacheInterface |
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*/ |
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private $cache; |
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/** |
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* Cache TTL in seconds. |
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* |
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* @var int Default is 10 minutes |
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*/ |
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private $ttl = 600; |
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/** |
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* @param array $nodeUrls |
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* @param CacheInterface|null $cache |
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* @param LoggerInterface|null $log |
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* |
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* @throws ConnectException |
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*/ |
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public function __construct(array $nodeUrls = array(), CacheInterface $cache = null, LoggerInterface $log = null) |
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{ |
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if (!$cache) { |
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$cache = new MemoryCache(); |
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} |
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$this->cache = $cache; |
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parent::__construct($nodeUrls, $log); |
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} |
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/** |
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* Connect to a random node in the (cached) node list. |
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* |
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* @return DefaultStream Stream to a connected node. |
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* |
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* @throws ConnectException |
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*/ |
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public function connect() |
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{ |
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$key = array_reduce($this->nodeUrls, function ($current, $prev) { |
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return md5($current.$prev); |
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}, ''); |
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// prefer cached results |
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$hit = $this->cache->get($key); |
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if (!empty($hit)) { |
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$this->log->notice('nodelist retrieved from cache', ['nodes' => $hit, 'key' => $key]); |
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$this->nodeUrls = $hit; |
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} |
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$stream = parent::connect(); |
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// update cache |
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if (empty($hit)) { |
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$this->updateNodes($key, $stream); |
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} |
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return $stream; |
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} |
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/** |
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* Return the internal node cache TTL. |
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* |
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* @return int |
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*/ |
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public function getCacheTtl() |
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{ |
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return $this->ttl; |
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} |
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/** |
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* Set the internal node cache TTL. |
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* |
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* @param int $ttl |
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*/ |
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public function setCacheTtl($ttl) |
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{ |
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$this->ttl = (int)$ttl; |
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} |
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/** |
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* Update the node list using the HELLO command. |
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* |
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* @param string $key |
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* @param StreamInterface $stream |
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*/ |
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private function updateNodes($key, StreamInterface $stream) |
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{ |
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$this->nodeUrls = array_map(function (NodeInfo $element) { |
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return $element->getServer(); |
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}, (new Node($stream, $this->log))->hello()); |
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$this->log->notice('caching connection info from HELLO', [ |
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'key' => $key, |
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'nodes' => $this->nodeUrls, |
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'ttl' => $this->getCacheTtl(), |
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]); |
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$this->cache->set($key, $this->nodeUrls, $this->getCacheTtl()); |
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} |
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} |
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0x20h /
phloppy
