<?php
/**
 * Created by PhpStorm.
 * User: edz
 * Date: 2019-04-30
 * Time: 17:22
 */

namespace App\Service;

use Illuminate\Support\Facades\Log;
use PhpAmqpLib\Connection\AMQPStreamConnection;
use PhpAmqpLib\Message\AMQPMessage;

class RabbitMqUtil
{
    private static $instance = null;
    protected $connection = null;
    protected $channel = null;

    public function __construct()
    {
        $this->connection = $this->getConnection();
        $this->channel = $this->connection->channel();
    }

    /**
     * 单例实例化入口;
     */
    public static function getInstance()
    {
        if (!self::$instance instanceof self) {
            self::$instance = new self();
        }
        return self::$instance;
    }

    public function getConnection()
    {
        $conn = false;
        if ($this->connection) {
            return $this->connection;
        }
        for ($i = 0; $i < 3; $i++) {
            $connection = $this->createConn();
            if ($connection) {
                $conn = $connection;
                break;
            }
            Log::info("create amqp conn retry=" . $i);
        }
        return $conn;
    }

    public function createConn()
    {
        try {
            $connection = new AMQPStreamConnection(env('MQ_HOST'), env('MQ_PORT'), env('MQ_USERNAME'), env('MQ_PWD'), env('MQ_VHOST'));
        } catch (\Exception $exception) {
            Log::info("AMQP connection Error" . $exception->getMessage());
            $connection = false;
        }
        return $connection;
    }

    /**
     * 生产消息-分布式任务模式（Work queues）
     * @param $queue
     * @param $data
     */
    public function push($queue, $data)
    {
        try {
            $this->channel->queue_declare($queue, false, true, false, false);
            $msg = new AMQPMessage(
                \GuzzleHttp\json_encode($data),
                array('delivery_mode' => AMQPMessage::DELIVERY_MODE_PERSISTENT)
            );
            return $this->channel->basic_publish($msg, '', $queue);
        } catch (\Exception $exception) {
            Log::error('发布消息失败,数据：'.\GuzzleHttp\json_encode($data).'，错误原因：' . $exception->getMessage());
        }
    }

    /**
     * 生产消息-发布订阅模式（Publish/Subscribe）
     *
     * @param $queue string
     * @param $data array
     */
    public function publish($queue, $data)
    {
        try {
            $this->channel->exchange_declare($queue, 'fanout', false, true, false);
            $msg = new AMQPMessage(
                \GuzzleHttp\json_encode($data),
                array('delivery_mode' => AMQPMessage::DELIVERY_MODE_PERSISTENT)
            );
            return $this->channel->basic_publish($msg, $queue);
        } catch (\Exception $exception) {
            Log::error('发布订阅消息失败,数据：'.\GuzzleHttp\json_encode($data).'，错误原因：' . $exception->getMessage());
        }
    }

    public function __destruct()
    {
        $this->channel->close();
        $this->connection->close();
        self::$instance = null;
    }
}