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table = $table; $this->prefix = $prefix; $this->encrypter = $encrypter; $this->connection = $connection; } /** * Retrieve an item from the cache by key. * * @param string|array $key * @return mixed */ public function get($key) { $prefixed = $this->prefix.$key; $cache = $this->table()->where('key', '=', $prefixed)->first(); // If we have a cache record we will check the expiration time against current // time on the system and see if the record has expired. If it has, we will // remove the records from the database table so it isn't returned again. if (! is_null($cache)) { if (is_array($cache)) { $cache = (object) $cache; } if (time() >= $cache->expiration) { $this->forget($key); return; } return $this->encrypter->decrypt($cache->value); } } /** * Store an item in the cache for a given number of minutes. * * @param string $key * @param mixed $value * @param int $minutes * @return void */ public function put($key, $value, $minutes) { $key = $this->prefix.$key; // All of the cached values in the database are encrypted in case this is used // as a session data store by the consumer. We'll also calculate the expire // time and place that on the table so we will check it on our retrieval. $value = $this->encrypter->encrypt($value); $expiration = $this->getTime() + ($minutes * 60); try { $this->table()->insert(compact('key', 'value', 'expiration')); } catch (Exception $e) { $this->table()->where('key', '=', $key)->update(compact('value', 'expiration')); } } /** * Increment the value of an item in the cache. * * @param string $key * @param mixed $value * @return int|bool */ public function increment($key, $value = 1) { return $this->incrementOrDecrement($key, $value, function ($current, $value) { return $current + $value; }); } /** * Decrement the value of an item in the cache. * * @param string $key * @param mixed $value * @return int|bool */ public function decrement($key, $value = 1) { return $this->incrementOrDecrement($key, $value, function ($current, $value) { return $current - $value; }); } /** * Increment or decrement an item in the cache. * * @param string $key * @param mixed $value * @param \Closure $callback * @return int|bool */ protected function incrementOrDecrement($key, $value, Closure $callback) { return $this->connection->transaction(function () use ($key, $value, $callback) { $prefixed = $this->prefix.$key; $cache = $this->table()->where('key', $prefixed)->lockForUpdate()->first(); if (is_null($cache)) { return false; } if (is_array($cache)) { $cache = (object) $cache; } $current = $this->encrypter->decrypt($cache->value); $new = $callback((int) $current, $value); if (! is_numeric($current)) { return false; } $this->table()->where('key', $prefixed)->update([ 'value' => $this->encrypter->encrypt($new), ]); return $new; }); } /** * Get the current system time. * * @return int */ protected function getTime() { return time(); } /** * Store an item in the cache indefinitely. * * @param string $key * @param mixed $value * @return void */ public function forever($key, $value) { $this->put($key, $value, 5256000); } /** * Remove an item from the cache. * * @param string $key * @return bool */ public function forget($key) { $this->table()->where('key', '=', $this->prefix.$key)->delete(); return true; } /** * Remove all items from the cache. * * @return void */ public function flush() { $this->table()->delete(); } /** * Get a query builder for the cache table. * * @return \Illuminate\Database\Query\Builder */ protected function table() { return $this->connection->table($this->table); } /** * Get the underlying database connection. * * @return \Illuminate\Database\ConnectionInterface */ public function getConnection() { return $this->connection; } /** * Get the encrypter instance. * * @return \Illuminate\Contracts\Encryption\Encrypter */ public function getEncrypter() { return $this->encrypter; } /** * Get the cache key prefix. * * @return string */ public function getPrefix() { return $this->prefix; } }