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Don't save duplicate messages into a user's packed inbox. We've already got the packed box loaded at insert time, so we can simply unpack it and check before doing the update query.

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Should help with dupes that come in when inbox distrib jobs die and get restarted, etc.
This commit is contained in:
Brion Vibber 2010-04-02 15:39:43 -07:00
parent b10ff031d9
commit 61394aa8ac
1 changed files with 37 additions and 2 deletions
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39
classes/Inbox.php
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@ -96,12 +96,23 @@ class Inbox extends Memcached_DataObject
$inbox = new Inbox();
$inbox->user_id = $user_id;
$inbox->notice_ids = call_user_func_array('pack', array_merge(array('N*'), $ids));
$inbox->pack($ids);
$inbox->fake = true;
return $inbox;
}
/**
* Append the given notice to the given user's inbox.
* Caching updates are managed for the inbox itself.
*
* If the notice is already in this inbox, the second
* add will be silently dropped.
*
* @param int @user_id
* @param int $notice_id
* @return boolean success
*/
static function insertNotice($user_id, $notice_id)
{
$inbox = DB_DataObject::staticGet('inbox', 'user_id', $user_id);
@ -114,6 +125,13 @@ class Inbox extends Memcached_DataObject
return false;
}
$ids = $inbox->unpack();
if (in_array(intval($notice_id), $ids)) {
// Already in there, we probably re-ran some inbox adds
// due to an error. Skip the dupe silently.
return true;
}
$result = $inbox->query(sprintf('UPDATE inbox '.
'set notice_ids = concat(cast(0x%08x as binary(4)), '.
'substr(notice_ids, 1, %d)) '.
@ -150,7 +168,7 @@ class Inbox extends Memcached_DataObject
}
}
$ids = unpack('N*', $inbox->notice_ids);
$ids = $inbox->unpack();
if (!empty($since_id)) {
$newids = array();
@ -229,4 +247,21 @@ class Inbox extends Memcached_DataObject
}
return new ArrayWrapper($items);
}
/**
* Saves a list of integer notice_ids into a packed blob in this object.
* @param array $ids list of integer notice_ids
*/
protected function pack(array $ids)
{
$this->notice_ids = call_user_func_array('pack', array_merge(array('N*'), $ids));
}
/**
* @return array of integer notice_ids
*/
protected function unpack()
{
return unpack('N*', $this->notice_ids);
}
}