How to trigger the background asynchronous batch sending of SMS messages in the foreground without affecting the user experience?

This article introduces how to enable the front-end to trigger the background to send text messages in batches without affecting the user experience. After the user clicks the button, the front desk immediately returns the success prompt, and the back desk performs database query, Redis cache write and SMS sending asynchronously.

Core idea: asynchronous processing

This solution uses an asynchronous processing mechanism to move time-consuming operations to the background to perform, avoiding blocking the foreground. The specific steps are as follows:

1. Front-end Ajax request: The user clicks the send button, and the front-end uses Ajax to send a request to the background. The request parameters include the SMS template ID, mobile phone number list and SMS content.

    $.ajax({
       url: '/send-sms',
       type: 'POST',
       data: { template_id: 123, mobiles: ['13800138000', '13800138001'], content: 'Test SMS' },
       success: function(response) {
           alert('SMS send request has been submitted');
       },
       error: function(error) {
           alert('Request failed:' error.responseText);
       }
   });

2. The background receives the request and returns the response: After the background receives the Ajax request, it immediately returns a successful response (JSON format) to inform the front-end that the request has been received. The key is that the SMS sending logic is put into an asynchronous task.

    // Background controller method public function sendSmsAction() {
       $templateId = $_POST['template_id'];
       $mobiles = $_POST['mobiles'];
       $content = $_POST['content'];
   
       // Return the successful response immediately echo json_encode(['success' => true, 'message' => 'Request received, SMS sending task started']);
   
       // Add tasks to queues (for example using Redis or RabbitMQ)
       $this->addTaskToQueue($templateId, $mobiles, $content);
   }

3. Asynchronous task processing: addTaskToQueue method adds SMS sending task to the message queue. An independent background process (for example, using queue workers) continuously listens to the queue, fetches tasks and executes them.

    // Add tasks to queue (example using Redis)
   private function addTaskToQueue($templateId, $mobiles, $content) {
       $redis = new Redis();
       $redis->connect('127.0.0.1', 6379);
       $redis->lPush('sms_queue', json_encode(['template_id' => $templateId, 'mobiles' => $mobiles, 'content' => $content]));
   }

4. Queue Worker: Queue Worker obtains tasks from the sms_queue queue, performs SMS sending, and processes error logs.

    // Queue Worker (Example)
   while (true) {
       $task = $redis->rPop('sms_queue');
       if ($task) {
           $data = json_decode($task, true);
           $result = $this->sendSms($data['template_id'], $data['mobiles'], $data['content']);
           if ($result !== true) {
               // Log error_log("SMS send failed: " . $result);
           }
       }
       sleep(1); // Avoid excessive CPU usage}

5. SMS send function ( sendSms ) : This function calls the SMS service provider API to send SMS messages.

Through the above steps, the front-end user experience will not be affected, and the back-end will efficiently process batch SMS sending. Choosing the right queue system (Redis, RabbitMQ, Beanstalkd, etc.) is crucial, which ensures that tasks are processed reliably and supports distributed environments. In addition, a complete error handling and logging mechanism is also essential.

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