PHP Apple Enhanced Push Notification读取错误响应

Question

在PHP中，如何使用fread()检查发送增强型推送通知时是否有错误响应？

我已经阅读了 Apple 文档、通过 Google 发布的一些含糊不清的帖子以及此处关于 SO 的一些问题/答案，但这仍然非常令人困惑。

这是我看到的: http://developer.apple.com/library/mac/#documentation/NetworkingInternet/Conceptual/RemoteNotificationsPG/IPhoneOSClientImp/IPhoneOSClientImp.html Reading error from Apple enhanced push notification with PHP iPhone Push Notification - Error response problem

我将在下面回答我自己的问题，基于以下事实:(1) 我发现这是一个非常令人困惑的话题，并且 (2) 我必须通过大量试验和错误将信息拼凑起来才能得到它工作，以及 (3) 这篇博文表示鼓励:https://blog.stackoverflow.com/2011/07/its-ok-to-ask-and-answer-your-own-questions/

Answer 1

发送推送通知时，有几个问题:

• 如果出现问题，Apple 会断开与您的连接，但您并不知道。当您使用基本通知时，无法知道它们是否已全部发送。 解决方案: 这就是使用增强通知然后检查错误响应的全部要点。请注意，我们将在数据库查询中使用“ORDER BY id”，然后使用该 id 作为我们在通知中发送的标识符。这样，如果出现问题，我们就可以确切地知道数据库中的哪一行导致了问题(因此我们知道 Apple 何时与我们断开连接并停止发送通知)。然后，我们可以继续向导致问题的行之后的所有行发送推送通知，而不必重新发送给我们已经发送到的行。

• 如果一切正常，Apple 不会发回任何响应，因此这可能会导致您的脚本在 fread() 等待未到来的数据时暂停并永远等待。 解决方案: 需要将 stream_set_blocking 设置为 0，以便 fread 始终立即返回。请注意，这会导致 fread 在收到错误响应之前返回的另一个小问题，但请参阅代码中的解决方法，即在完成所有发送后暂停 1/2 秒，然后再检查一次 fread .

• 您发送多个推送通知的速度比错误响应回复您的速度快得多。 解决方案: 同样，这与上面提到的解决方法相同...在所有发送完成后暂停 1/2 秒，然后再检查一次 fread。

这是我使用 PHP 的解决方案，它解决了我遇到的所有问题。它非常基本，但可以完成工作。我已经通过一次发送几个通知以及一次发送 120,000 个通知对其进行了测试。

<?php
/*
 * Read Error Response when sending Apple Enhanced Push Notification
 *
 * This assumes your iOS devices have the proper code to add their device tokens
 * to the db and also the proper code to receive push notifications when sent.
 *
 */

//database
$host = "localhost";
$user = "my_db_username";
$pass = "my_db_password";
$dbname = "my_db_name";
$con = mysql_connect($host, $user, $pass);
if (!$con) {
    die('Could not connect to database: ' . mysql_error());
} else {
    mysql_select_db($dbname, $con);
}

// IMPORTANT: make sure you ORDER BY id column
$result = mysql_query("SELECT id,token FROM `device_tokens` ORDER BY id");

//Setup notification message
$body = array();
$body['aps'] = array('alert' => 'My push notification message!');
$body['aps']['notifurl'] = 'http://www.myexampledomain.com';
$body['aps']['badge'] = 1;

//Setup stream (connect to Apple Push Server)
$ctx = stream_context_create();
stream_context_set_option($ctx, 'ssl', 'passphrase', 'password_for_apns.pem_file');
stream_context_set_option($ctx, 'ssl', 'local_cert', 'apns.pem');
$fp = stream_socket_client('ssl://gateway.push.apple.com:2195', $err, $errstr, 60, STREAM_CLIENT_CONNECT, $ctx);
stream_set_blocking ($fp, 0); //This allows fread() to return right away when there are no errors. But it can also miss errors during last seconds of sending, as there is a delay before error is returned. Workaround is to pause briefly AFTER sending last notification, and then do one more fread() to see if anything else is there.

if (!$fp) {
    //ERROR
    echo "Failed to connect (stream_socket_client): $err $errstrn";
} else {
    $apple_expiry = time() + (90 * 24 * 60 * 60); //Keep push alive (waiting for delivery) for 90 days

    //Loop thru tokens from database
    while($row = mysql_fetch_array($result)) {
        $apple_identifier = $row["id"];
        $deviceToken = $row["token"];
        $payload = json_encode($body);
        //Enhanced Notification
        $msg = pack("C", 1) . pack("N", $apple_identifier) . pack("N", $apple_expiry) . pack("n", 32) . pack('H*', str_replace(' ', '', $deviceToken)) . pack("n", strlen($payload)) . $payload;
        //SEND PUSH
        fwrite($fp, $msg); 
        //We can check if an error has been returned while we are sending, but we also need to check once more after we are done sending in case there was a delay with error response.
        checkAppleErrorResponse($fp);
    }

    //Workaround to check if there were any errors during the last seconds of sending.
    usleep(500000); //Pause for half a second. Note I tested this with up to a 5 minute pause, and the error message was still available to be retrieved

    checkAppleErrorResponse($fp);

    echo 'DONE!';

    mysql_close($con);
    fclose($fp);
}

//FUNCTION to check if there is an error response from Apple
//         Returns TRUE if there was and FALSE if there was not
function checkAppleErrorResponse($fp) {

   //byte1=always 8, byte2=StatusCode, bytes3,4,5,6=identifier(rowID). Should return nothing if OK.
   $apple_error_response = fread($fp, 6);
   //NOTE: Make sure you set stream_set_blocking($fp, 0) or else fread will pause your script and wait forever when there is no response to be sent.

   if ($apple_error_response) {
        //unpack the error response (first byte 'command" should always be 8)
        $error_response = unpack('Ccommand/Cstatus_code/Nidentifier', $apple_error_response);

        if ($error_response['status_code'] == '0') {
            $error_response['status_code'] = '0-No errors encountered';
        } else if ($error_response['status_code'] == '1') {
            $error_response['status_code'] = '1-Processing error';
        } else if ($error_response['status_code'] == '2') {
            $error_response['status_code'] = '2-Missing device token';
        } else if ($error_response['status_code'] == '3') {
            $error_response['status_code'] = '3-Missing topic';
        } else if ($error_response['status_code'] == '4') {
            $error_response['status_code'] = '4-Missing payload';
        } else if ($error_response['status_code'] == '5') {
            $error_response['status_code'] = '5-Invalid token size';
        } else if ($error_response['status_code'] == '6') {
            $error_response['status_code'] = '6-Invalid topic size';
        } else if ($error_response['status_code'] == '7') {
            $error_response['status_code'] = '7-Invalid payload size';
        } else if ($error_response['status_code'] == '8') {
            $error_response['status_code'] = '8-Invalid token';
        } else if ($error_response['status_code'] == '255') {
            $error_response['status_code'] = '255-None (unknown)';
        } else {
            $error_response['status_code'] = $error_response['status_code'] . '-Not listed';
        }

        echo '<br><b>+ + + + + + ERROR</b> Response Command:<b>' . $error_response['command'] . '</b>&nbsp;&nbsp;&nbsp;Identifier:<b>' . $error_response['identifier'] . '</b>&nbsp;&nbsp;&nbsp;Status:<b>' . $error_response['status_code'] . '</b><br>';
        echo 'Identifier is the rowID (index) in the database that caused the problem, and Apple will disconnect you from server. To continue sending Push Notifications, just start at the next rowID after this Identifier.<br>';

        return true;
   }
   return false;
}
?>