laravel4 Predis访问redis返回Error while reading line from the server

Question

我使用了laravel 4 framework开发，想把cache server从memcache切换到redis，在config/cache.php的driver设置为redis。但是调用cache::get()报错，报错信息如：

[2014-10-21 18:47:44] production.ERROR: exception 'Predis\Connection\ConnectionException' with message 'Error while reading line from the server [tcp://127.0.0.1:6379]' in /home/nginx/mono/vendor/predis/predis/lib/Predis/Connection/AbstractConnection.php:141

但是从redis-cli访问redis-server是ok的，在phpunit中单独测试redis也没问题。但是在Route中直接使用有问题。

Route::get('/test', function(){
    Cache::put('name', 'Taylor', 60); //报错！

    $name = Cache::get('name'); 

    echo $name;
});

谁能解释下问题在哪？

补充：刷新多次/test，会有几次正常。

Answer 1

Predis的StreamConnection Class

/**
 * Initializes a TCP stream resource.
 *
 * @param  ConnectionParametersInterface $parameters Parameters used to initialize the connection.
 * @return resource
 */
protected function tcpStreamInitializer(ConnectionParametersInterface $parameters)
{
    $uri = "tcp://{$parameters->host}:{$parameters->port}";
    $flags = STREAM_CLIENT_CONNECT;

    if (isset($parameters->async_connect) && $parameters->async_connect) {
        $flags |= STREAM_CLIENT_ASYNC_CONNECT;
    }

    if (isset($parameters->persistent) && $parameters->persistent) {
        $flags |= STREAM_CLIENT_PERSISTENT;
        $uri .= strpos($path = $parameters->path, '/') === 0 ? $path : "/$path";
    }

    $resource = @stream_socket_client($uri, $errno, $errstr, $parameters->timeout, $flags);

    if (!$resource) {
        $this->onConnectionError(trim($errstr), $errno);
    }
    //问题在这里，需要给读取流设置超时时间，否则就在读取流数据时连接报错，
    //可以直接设置read_write_timeout为0，以此解决问题。
    if (isset($parameters->read_write_timeout)) {
        $rwtimeout = $parameters->read_write_timeout;
        $rwtimeout = $rwtimeout > 0 ? $rwtimeout : -1;
        $timeoutSeconds  = floor($rwtimeout);
        $timeoutUSeconds = ($rwtimeout - $timeoutSeconds) * 1000000;
        stream_set_timeout($resource, $timeoutSeconds, $timeoutUSeconds);
    }

    if (isset($parameters->tcp_nodelay) && function_exists('socket_import_stream')) {
        $socket = socket_import_stream($resource);
        socket_set_option($socket, SOL_TCP, TCP_NODELAY, (int) $parameters->tcp_nodelay);
    }

    return $resource;
}

Answer 2

production.ERROR

config 中是否有 production 文件夹？里面是否有 cache.php 文件？那样的话会覆盖外面的配置。