背景：
最近需要做个服务端消息推送的事情，首先就考虑到了Laravel自带的广播功能，它是利用redis的发布订阅功能和前端利用node.js实现的一套集合了Websocket 的功能
前置条件：
后端：
1，安装redis扩展
composer require predis/predis
2，在config/app.php中打开注释：
App\Providers\BroadcastServiceProvider::class,
3，在.env中
APP_URL=http://your_domain.com #域名
APP_NAME=YourAppName #默认laravel即可
QUEUE_CONNECTION=redis #redis队列
BROADCAST_DRIVER=redis #broadcast的驱动使用redis
前端：
1,npm Install
2,npm install -g laravel-echo-server #https://github.com/tlaverdure/laravel-echo-server
3,npm install --save socket.io-client
公有频道
1,后端代码：
<?php
namespace App\Events;
use Illuminate\Broadcasting\Channel;
use Illuminate\Queue\SerializesModels;
use Illuminate\Foundation\Events\Dispatchable;
use Illuminate\Broadcasting\InteractsWithSockets;
use Illuminate\Contracts\Broadcasting\ShouldBroadcast;
class PublicEvent implements ShouldBroadcast
{
use Dispatchable, InteractsWithSockets, SerializesModels;
/**
* Create a new event instance.
*
* @return void
*/
public $msg = '';
public function __construct($msg)
{
$this->msg = $msg;
}
/**
* Get the channels the event should broadcast on.
*
* @return \Illuminate\Broadcasting\Channel|array
*/
public function broadcastOn()
{
return new Channel('public');
}
// public function broadcastWith()
// {
// return [
// 'data' => 'this is public'
// ];
// }
}
2,前端代码
<script>
import Echo from 'laravel-echo'
window.io = require('socket.io-client');
window.Echo = new Echo({
broadcaster: 'socket.io',
host: window.location.hostname + ':6001',
});
window.Echo.channel('public')
.listen('PublicEvent', (e) => {
console.log(e);
});
</script>
3，打开页面在console,即可以看到我们发送的数据
{msg: "this is public", socket: null}
msg: "this is public"
socket: null
__proto__: Object
}
私有频道
PrivateEvent：
<?php
namespace App\Events;
use App\Models\UserModel;
use Illuminate\Queue\SerializesModels;
use Illuminate\Broadcasting\PrivateChannel;
use Illuminate\Foundation\Events\Dispatchable;
use Illuminate\Broadcasting\InteractsWithSockets;
use Illuminate\Contracts\Broadcasting\ShouldBroadcast;
class PrivateEvent implements ShouldBroadcast
{
use Dispatchable, InteractsWithSockets, SerializesModels;
public $user;
public $userId = '';
/**
* Create a new event instance.
*
* @return void
*/
public function __construct(UserModel $user)
{
$this->user = $user;
$this->userId = 3590;
// dd('user.' . $this->user->u_id);
}
/**
* Get the channels the event should broadcast on.
*
* @return \Illuminate\Broadcasting\Channel|array
*/
public function broadcastOn()
{
// dd(Auth::user());
return new PrivateChannel('user.' . $this->userId);
}
// 精细化返回的数据，如果加了这个函数，公有属性才不会返回而是以这个函数内放回的字段为主
// public function broadcastWith()
// {
// return [
// 'data' => '2424',
// ];
// }
}
BroadcastServiceProvider:
<?php
namespace App\Providers;
use Illuminate\Support\ServiceProvider;
use Illuminate\Support\Facades\Broadcast;
class BroadcastServiceProvider extends ServiceProvider
{
/**
* Bootstrap any application services.
*
* @return void
*/
public function boot()
{
//Broadcast::routes();
Broadcast::routes(['middleware' => 'api']);
#routes()参数如果不配置 默认走的是web中间件
#'middleware' => 'api' 然后广播路由走api中间件，自己也可以定义其他类型的中间件
require base_path('routes/channels.php'); #加载检查权限的广播路由
}
}
routes/channels：#广播路由只针对广播的
<?php
/*
|--------------------------------------------------------------------------
| Broadcast Channels
|--------------------------------------------------------------------------
|
| Here you may register all of the event broadcasting channels that your
| application supports. The given channel authorization callbacks are
| used to check if an authenticated user can listen to the channel.
|
*/
//占位符模式
\Illuminate\Support\Facades\Broadcast::channel('user.{userId}', function ($user, $userId) {
return true;
}, ['guards' => ['api']]);
#{userId}只是占位符
#$user 闭包默认的第一个参数，授权的用户
#$userId 时间模板的公有属性(此时该值为3590即在PrivateEvent构造函数上所赋的值)，也可以是其他的对象
#闭包函数接受多个参数，这个参数由事件里的broadcastOn函数声明的频道决定,如：'user.' . $this->userId . $this->userName 那么就可以接受2个参数userId和userName
//显式的路由模型绑定
\Illuminate\Support\Facades\Broadcast::channel('user.{user2}', function ($user, \App\Models\UserModel $user2) {
\Illuminate\Support\Facades\Log::info($user);
return true;
}, ['guards' => ['api']]);
# 注意这里的占位符{user2} 必须 \App\Models\UserModel $user2 这个变量名一样。否则会报错
前端代码
<script>
import Echo from 'laravel-echo'
window.io = require('socket.io-client');
window.Echo = new Echo({
broadcaster: 'socket.io',
host: window.location.hostname + ':6001',
auth: {
headers: {
Authorization: 'Bearer ' + 'WVP25lQfJFTpCcuA1rmdadgeXQplMOtobWjL4TvkDD8dMbjOX5pBF4kBwiC9'
},
},
});
window.Echo.private('user.3590')
.listen('PrivateEvent', (e) => {
alert(11);
console.log(1111);
console.log(e);
});
</script>
#user.3590 监听的频道
#PrivateEvent 监听的事件
#Authorization 授权，后端会检测如果不对会报错403
页面展示：不出意外会把公有属性全部展示出来，其他的属性不会展示
{
user: {…}, userId: 3590, socket: null}
socket: null
user: {u_id: 3590, u_username: "02125", u_job_number: "", u_warehouse_id: 1, u_department_id: 0, …}
userId: 3590
__proto__: Object
}
参考：
https://xueyuanjun.com/post/19505
http://silverd.cn/2018/06/01/laravel-broadcasting-adv.html
