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[friendica.git] / src / Model / PushSubscriber.php
1 <?php
2 /**
3  * @file src/Model/PushSubscriber.php
4  */
5 namespace Friendica\Model;
6
7 use Friendica\Core\Logger;
8 use Friendica\Core\Worker;
9 use Friendica\Database\DBA;
10 use Friendica\Util\DateTimeFormat;
11
12 require_once 'include/dba.php';
13
14 class PushSubscriber
15 {
16         /**
17          * @brief Send subscription notifications for the given user
18          *
19          * @param integer $uid      User ID
20          * @param string  $priority Priority for push workers
21          */
22         public static function publishFeed($uid, $default_priority = PRIORITY_HIGH)
23         {
24                 $condition = ['push' => 0, 'uid' => $uid];
25                 DBA::update('push_subscriber', ['push' => 1, 'next_try' => DBA::NULL_DATETIME], $condition);
26
27                 self::requeue($default_priority);
28         }
29
30         /**
31          * @brief start workers to transmit the feed data
32          *
33          * @param string $priority Priority for push workers
34          */
35         public static function requeue($default_priority = PRIORITY_HIGH)
36         {
37                 // We'll push to each subscriber that has push > 0,
38                 // i.e. there has been an update (set in notifier.php).
39                 $subscribers = DBA::select('push_subscriber', ['id', 'push', 'callback_url', 'nickname'], ["`push` > 0 AND `next_try` < UTC_TIMESTAMP()"]);
40
41                 while ($subscriber = DBA::fetch($subscribers)) {
42                         // We always handle retries with low priority
43                         if ($subscriber['push'] > 1) {
44                                 $priority = PRIORITY_LOW;
45                         } else {
46                                 $priority = $default_priority;
47                         }
48
49                         Logger::log('Publish feed to ' . $subscriber['callback_url'] . ' for ' . $subscriber['nickname'] . ' with priority ' . $priority, Logger::DEBUG);
50                         Worker::add($priority, 'PubSubPublish', (int)$subscriber['id']);
51                 }
52
53                 DBA::close($subscribers);
54         }
55
56         /**
57          * @brief Renew the feed subscription
58          *
59          * @param integer $uid          User ID
60          * @param string  $nick         Priority for push workers
61          * @param integer $subscribe    Subscribe (Unsubscribe = false)
62          * @param string  $hub_callback Callback address
63          * @param string  $hub_topic    Feed topic
64          * @param string  $hub_secret   Subscription secret
65          */
66         public static function renew($uid, $nick, $subscribe, $hub_callback, $hub_topic, $hub_secret)
67         {
68                 // fetch the old subscription if it exists
69                 $subscriber = DBA::selectFirst('push_subscriber', ['last_update', 'push'], ['callback_url' => $hub_callback]);
70
71                 // delete old subscription if it exists
72                 DBA::delete('push_subscriber', ['callback_url' => $hub_callback]);
73
74                 if ($subscribe) {
75                         // if we are just updating an old subscription, keep the
76                         // old values for last_update but reset the push
77                         if (DBA::isResult($subscriber)) {
78                                 $last_update = $subscriber['last_update'];
79                                 $push_flag = min($subscriber['push'], 1);
80                         } else {
81                                 $last_update = DateTimeFormat::utcNow();
82                                 $push_flag = 0;
83                         }
84
85                         // subscribe means adding the row to the table
86                         $fields = ['uid' => $uid, 'callback_url' => $hub_callback,
87                                 'topic' => $hub_topic, 'nickname' => $nick, 'push' => $push_flag,
88                                 'last_update' => $last_update, 'renewed' => DateTimeFormat::utcNow(),
89                                 'secret' => $hub_secret];
90                         DBA::insert('push_subscriber', $fields);
91
92                         Logger::log("Successfully subscribed [$hub_callback] for $nick");
93                 } else {
94                         Logger::log("Successfully unsubscribed [$hub_callback] for $nick");
95                         // we do nothing here, since the row was already deleted
96                 }
97         }
98
99         /**
100          * @brief Delay the push subscriber
101          *
102          * @param integer $id Subscriber ID
103          */
104         public static function delay($id)
105         {
106                 $subscriber = DBA::selectFirst('push_subscriber', ['push', 'callback_url', 'renewed', 'nickname'], ['id' => $id]);
107                 if (!DBA::isResult($subscriber)) {
108                         return;
109                 }
110
111                 $retrial = $subscriber['push'];
112
113                 if ($retrial > 14) {
114                         // End subscriptions if they weren't renewed for more than two months
115                         $days = round((time() -  strtotime($subscriber['renewed'])) / (60 * 60 * 24));
116
117                         if ($days > 60) {
118                                 DBA::update('push_subscriber', ['push' => -1, 'next_try' => DBA::NULL_DATETIME], ['id' => $id]);
119                                 Logger::log('Delivery error: Subscription ' . $subscriber['callback_url'] . ' for ' . $subscriber['nickname'] . ' is marked as ended.', Logger::DEBUG);
120                         } else {
121                                 DBA::update('push_subscriber', ['push' => 0, 'next_try' => DBA::NULL_DATETIME], ['id' => $id]);
122                                 Logger::log('Delivery error: Giving up ' . $subscriber['callback_url'] . ' for ' . $subscriber['nickname'] . ' for now.', Logger::DEBUG);
123                         }
124                 } else {
125                         // Calculate the delay until the next trial
126                         $delay = (($retrial + 3) ** 4) + (rand(1, 30) * ($retrial + 1));
127                         $next = DateTimeFormat::utc('now + ' . $delay . ' seconds');
128
129                         $retrial = $retrial + 1;
130
131                         DBA::update('push_subscriber', ['push' => $retrial, 'next_try' => $next], ['id' => $id]);
132                         Logger::log('Delivery error: Next try (' . $retrial . ') ' . $subscriber['callback_url'] . ' for ' . $subscriber['nickname'] . ' at ' . $next, Logger::DEBUG);
133                 }
134         }
135
136         /**
137          * @brief Reset the push subscriber
138          *
139          * @param integer $id          Subscriber ID
140          * @param date    $last_update Date of last transmitted item
141          */
142         public static function reset($id, $last_update)
143         {
144                 $subscriber = DBA::selectFirst('push_subscriber', ['callback_url', 'nickname'], ['id' => $id]);
145                 if (!DBA::isResult($subscriber)) {
146                         return;
147                 }
148
149                 // set last_update to the 'created' date of the last item, and reset push=0
150                 $fields = ['push' => 0, 'next_try' => DBA::NULL_DATETIME, 'last_update' => $last_update];
151                 DBA::update('push_subscriber', $fields, ['id' => $id]);
152                 Logger::log('Subscriber ' . $subscriber['callback_url'] . ' for ' . $subscriber['nickname'] . ' is marked as vital', Logger::DEBUG);
153         }
154 }