Laravel および Vue.js のサーバー送信イベント (SSE) によるリアルタイム通知

Route::get('/notifications', [NotificationController::class, 'get']);

namespace App\Http\Controllers;

use App\Models\Notification;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\Auth;

class NotificationController extends Controller
{
    public function get(Request $request)
    {
        $headers = [
            "Content-Type" => "text/event-stream",
            "Cache-Control" => "no-cache",
            "Connection" => "keep-alive",
            "X-Accel-Buffering" => "no",
        ];

        return response()->stream(function () {
            while (true) {
                // Fetch the unread notifications for the authenticated user
                $notifications = Notification::where('clicked', 0)
                                             ->where('user_id', 2)  // For now, hardcoding the user ID, you can replace it with Auth::id() for dynamic user handling
                                             ->get();

                // If there are notifications, send them to the frontend
                if ($notifications->isNotEmpty()) {
                    // Format notifications as JSON and send them via SSE
                    echo "data: " . json_encode($notifications) . "\n\n";
                }

                // Flush the output buffer
                ob_flush();
                flush();

                // Sleep for a few seconds before checking again
                sleep(5);
            }
        }, 200, $headers);
    }
}

<template>
  <div>
    <h3>Unread Notifications</h3>
    <ul v-if="notifications.length">
      <li v-for="notification in notifications" :key="notification.id">
        {{ notification.message }}
      </li>
    </ul>
    <p v-else>No new notifications</p>
  </div>
</template>

<script>
export default {
  data() {
    return {
      notifications: [], // Store notifications
    };
  },
  mounted() {
    // Initialize EventSource to listen to the /api/notifications endpoint
    const eventSource = new EventSource('/api/notifications');

    // Handle incoming events from SSE
    eventSource.onmessage = (event) => {
      const data = JSON.parse(event.data); // Parse JSON data from the server
      this.notifications = data;  // Update notifications list
    };

    // Handle errors
    eventSource.onerror = (error) => {
      console.error("EventSource failed:", error);
      eventSource.close(); // Close the connection if there's an error
    };
  },
  beforeDestroy() {
    // Close the SSE connection when the component is destroyed
    if (this.eventSource) {
      this.eventSource.close();
    }
  }
};
</script>