2020-03-19 11:48:15 +08:00
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# NSQ
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2020-03-10 17:36:29 +08:00
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2020-03-19 11:48:15 +08:00
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[NSQ](https://nsq.io) 是一个由 Go 语言编写的开源、轻量级、高性能的实时分布式消息中间件。
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## 安装
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```bash
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2020-04-08 16:00:59 +08:00
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composer require hyperf/nsq
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```
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2020-03-10 17:36:29 +08:00
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## 使用
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### 配置
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2020-03-19 11:48:15 +08:00
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NSQ 组件的配置文件默认位于 `config/autoload/nsq.php` 内,如该文件不存在,可通过 `php bin/hyperf.php vendor:publish hyperf/nsq` 命令来将发布对应的配置文件。
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默认配置文件如下:
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```php
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<?php
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2020-03-10 17:36:29 +08:00
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return [
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'default' => [
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'host' => '127.0.0.1',
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'port' => 4150,
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'pool' => [
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'min_connections' => 1,
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'max_connections' => 10,
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'connect_timeout' => 10.0,
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'wait_timeout' => 3.0,
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'heartbeat' => -1,
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'max_idle_time' => 60.0,
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],
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],
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];
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```
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### 创建消费者
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2020-03-19 11:48:15 +08:00
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通过 `gen:nsq-consumer` 命令可以快速的生成一个 消费者(Consumer) 对消息进行消费。
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```bash
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php bin/hyperf.php gen:nsq-consumer DemoConsumer
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2020-03-10 17:36:29 +08:00
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```
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2020-03-19 11:48:15 +08:00
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您也可以通过使用 `Hyperf\Nsq\Annotation\Consumer` 注解来对一个 `Hyperf/Nsq/AbstractConsumer` 抽象类的子类进行声明,来完成一个 消费者(Consumer) 的定义,其中`Hyperf\Nsq\Annotation\Consumer` 注解和抽象类均包含以下属性:
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| 配置 | 类型 | 注解或抽象类默认值 | 备注 |
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|:-------:|:------:|:------:|:----------------:|
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| topic | string | '' | 要监听的 topic |
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| channel | string | '' | 要监听的 channel |
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| name | string | NsqConsumer | 消费者的名称 |
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| nums | int | 1 | 消费者的进程数 |
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| pool | string | default | 消费者对应的连接,对应配置文件的 key |
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这些注解属性是可选的,因为 `Hyperf/Nsq/AbstractConsumer` 抽象类中也分别定义了对应的成员属性以及 getter 和 setter,当不对注解属性进行定义时,会使用抽象类的属性默认值。
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2020-03-10 17:36:29 +08:00
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```php
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<?php
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declare(strict_types=1);
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namespace App\Nsq\Consumer;
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use Hyperf\Nsq\AbstractConsumer;
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use Hyperf\Nsq\Annotation\Consumer;
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use Hyperf\Nsq\Message;
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use Hyperf\Nsq\Result;
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/**
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* @Consumer(
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* topic="hyperf",
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* channel="hyperf",
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* name ="DemoNsqConsumer",
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* nums=1
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* )
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*/
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class DemoNsqConsumer extends AbstractConsumer
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{
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public function consume(Message $payload): string
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{
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var_dump($payload->getBody());
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return Result::ACK;
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2020-03-19 10:30:59 +08:00
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}
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}
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```
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### 禁止消费进程自启
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2020-03-19 11:48:15 +08:00
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默认情况下,使用了 `@Consumer` 注解定义后,框架会在启动时自动创建子进程来启动消费者,并且会在子进程异常退出后,自动重新拉起。但如果在处于开发阶段进行某些调试工作时,可能会因为消费者的自动消费导致调试的不便。
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2020-03-19 10:30:59 +08:00
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2020-03-26 11:16:02 +08:00
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在这种情况下,您可通过全局关闭和局部关闭两种形式来控制消费进程的自启。
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#### 全局关闭
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您可以在默认配置文件 `config/autoload/nsq.php` 中,将对应连接的 `enable` 选项设置为 `false`,即代表该连接下的所有消费者进程都关闭自启功能。
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#### 局部关闭
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当您只需要关闭个别消费进程的自启功能,只需要在对应的消费者中重写父类方法 `isEnable()` 并返回 `false` 即可关闭此消费者的自启功能;
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2020-03-19 10:30:59 +08:00
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```php
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<?php
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declare(strict_types=1);
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namespace App\Nsq\Consumer;
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use Hyperf\Nsq\AbstractConsumer;
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use Hyperf\Nsq\Annotation\Consumer;
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use Hyperf\Nsq\Message;
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use Hyperf\Nsq\Result;
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use Psr\Container\ContainerInterface;
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/**
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* @Consumer(
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* topic="demo_topic",
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* channel="demo_channel",
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* name ="DemoConsumer",
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* nums=1
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* )
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*/
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class DemoConsumer extends AbstractConsumer
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{
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public function __construct(ContainerInterface $container)
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{
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parent::__construct($container);
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}
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public function isEnable(): bool
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{
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return false;
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}
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public function consume(Message $payload): string
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{
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$body = json_decode($payload->getBody(), true);
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var_dump($body);
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return Result::ACK;
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}
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}
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```
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### 投递消息
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2020-03-19 11:48:15 +08:00
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您可以通过调用 `Hyperf\Nsq\Nsq::publish(string $topic, $message, float $deferTime = 0.0)` 方法来向 NSQ 投递消息, 下面是在 Command 进行消息投递的一个示例:
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```php
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<?php
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declare(strict_types=1);
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namespace App\Command;
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use Hyperf\Command\Command as HyperfCommand;
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use Hyperf\Command\Annotation\Command;
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use Hyperf\Nsq\Nsq;
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/**
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* @Command
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*/
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class NsqCommand extends HyperfCommand
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{
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protected $name = 'nsq:pub';
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public function handle()
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{
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/** @var Nsq $nsq */
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$nsq = make(Nsq::class);
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$topic = 'hyperf';
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$message = 'This is message at ' . time();
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$nsq->publish($topic, $message);
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$this->line('success', 'info');
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}
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}
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```
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### 一次性投递多条消息
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`Hyperf\Nsq\Nsq::publish(string $topic, $message, float $deferTime = 0.0)` 方法的第二个参数除了可以传递一个字符串外,还可以传递一个字符串数组,来实现一次性向一个 Topic 投递多条消息的功能,示例如下:
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```php
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<?php
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declare(strict_types=1);
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namespace App\Command;
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use Hyperf\Command\Command as HyperfCommand;
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use Hyperf\Command\Annotation\Command;
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use Hyperf\Nsq\Nsq;
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/**
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* @Command
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*/
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class NsqCommand extends HyperfCommand
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{
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protected $name = 'nsq:pub';
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public function handle()
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{
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/** @var Nsq $nsq */
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$nsq = make(Nsq::class);
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$topic = 'hyperf';
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$messages = [
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'This is message 1 at ' . time(),
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'This is message 2 at ' . time(),
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'This is message 3 at ' . time(),
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];
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$nsq->publish($topic, $messages);
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$this->line('success', 'info');
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}
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}
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```
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### 投递延迟消息
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当您希望您投递的消息在特定的时间后再去消费,也可通过对 `Hyperf\Nsq\Nsq::publish(string $topic, $message, float $deferTime = 0.0)` 方法的第三个参数传递对应的延迟时长,单位为秒,示例如下:
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```php
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<?php
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declare(strict_types=1);
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namespace App\Command;
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use Hyperf\Command\Command as HyperfCommand;
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use Hyperf\Command\Annotation\Command;
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use Hyperf\Nsq\Nsq;
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/**
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* @Command
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*/
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class NsqCommand extends HyperfCommand
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{
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protected $name = 'nsq:pub';
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public function handle()
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{
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/** @var Nsq $nsq */
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$nsq = make(Nsq::class);
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$topic = 'hyperf';
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$message = 'This is message at ' . time();
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$deferTime = 5.0;
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$nsq->publish($topic, $message, $deferTime);
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2020-03-19 11:48:15 +08:00
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$this->line('success', 'info');
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2020-03-10 17:36:29 +08:00
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}
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}
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2020-03-11 23:07:53 +08:00
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```
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2020-03-19 11:48:15 +08:00
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## NSQ 协议
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2020-03-11 23:07:53 +08:00
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> https://nsq.io/clients/tcp_protocol_spec.html
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2020-03-19 11:48:15 +08:00
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- Socket 基础
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2020-03-11 23:07:53 +08:00
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```plantuml
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@startuml
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autonumber
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hide footbox
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2020-03-19 11:48:15 +08:00
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title **Socket 基础**
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participant "客户端" as client
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participant "服务器" as server #orange
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activate client
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activate server
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note right of server: 建立连接
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client -> server: socket->connect(ip, port)
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...
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note right of server: 多次通信 send/recv
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client -> server: socket->send()
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server-> client: socket->recv()
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...
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note right of server: 关闭连接
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client->server: socket->close()
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deactivate client
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deactivate server
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@enduml
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```
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2020-03-19 11:48:15 +08:00
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- NSQ 协议流程
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2020-03-11 23:07:53 +08:00
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```plantuml
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@startuml
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autonumber
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hide footbox
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2020-03-19 11:48:15 +08:00
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title **NSQ 协议**
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2020-03-11 23:07:53 +08:00
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participant "客户端" as client
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participant "服务器" as server #orange
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activate client
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activate server
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== connect ==
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note left of client: connect 后都为 socket->send/recv
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client -> server: socket->connect(ip, host)
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note left of client: protocol version
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client->server: magic: V2
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== auth ==
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note left of client: client metadata
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client->server: IDENTIFY
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note right of server: 如果需要 auth
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server->client: auth_required=true
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client->server: AUTH
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...
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== pub ==
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note left of client: 发送一条消息
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client -> server: PUB <topic_name>
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note left of client: 发送多条消息
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client -> server: MPUB
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note left of client: 发送一条延时消息
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client -> server: DPUB
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...
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== sub ==
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note left of client: client 使用 channel 订阅 topic
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note right of server: SUB 成功后, client 出于 RDY 0 阶段
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client -> server: SUB <topic_name> <channel_name>
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note left of client: 使用 RDY 告诉 server 准备好消费 <count> 条消息
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client -> server: RDY <count>
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note right of server: server 返回 client <count> 条消息
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server -> client: <count> msg
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note left of client: 标记消息完成消费(消费成功)
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client -> server: FIN <message_id>
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note left of client: 消息重新入队(消费失败, 重新入队)
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client -> server: REQ <message_id> <timeout>
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note left of client: 重置消息超时时间
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client -> server: TOUCH <message_id>
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|
|
...
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|
|
== heartbeat ==
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server -> client: _heartbeat_
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note right of server: client 2 次没有应答 NOP, server 将断开连接
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client -> server: NOP
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|
|
...
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== close ==
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note left of client: clean close connection, 表示没有消息了, 关闭连接
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client -> server: CLS
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note right of server: server 端成功应答
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server -> client: CLOSE_WAIT
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deactivate client
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deactivate server
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@enduml
|
2020-03-26 11:16:02 +08:00
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```
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