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PhabricatorSubscriptionTriggerClock.php
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Fri, Nov 29, 12:26

PhabricatorSubscriptionTriggerClock.php
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<?php
/**
* Triggers an event every month on the same day of the month, like the 12th
* of the month.
*
* If a given month does not have such a day (for instance, the clock triggers
* on the 30th of each month and the month in question is February, which never
* has a 30th day), it will trigger on the last day of the month instead.
*
* Choosing this strategy for subscriptions is predictable (it's easy to
* anticipate when a subscription period will end) and fair (billing
* periods always have nearly equal length). It also spreads subscriptions
* out evenly. If there are issues with billing, this provides an opportunity
* for them to be corrected after only a few customers are affected, instead of
* (for example) having every subscription fail all at once on the 1st of the
* month.
*/
final class PhabricatorSubscriptionTriggerClock
extends PhabricatorTriggerClock {
public function validateProperties(array $properties) {
PhutilTypeSpec::checkMap(
$properties,
array(
'start' => 'int',
));
}
public function getNextEventEpoch($last_epoch, $is_reschedule) {
$start_epoch = $this->getProperty('start');
if (!$last_epoch) {
$last_epoch = $start_epoch;
}
// Constructing DateTime objects like this implies UTC, so we don't need
// to set that explicitly.
$start = new DateTime('@'.$start_epoch);
$last = new DateTime('@'.$last_epoch);
$year = (int)$last->format('Y');
$month = (int)$last->format('n');
// Note that we're getting the day of the month from the start date, not
// from the last event date. This lets us schedule on March 31 after moving
// the date back to Feb 28.
$day = (int)$start->format('j');
// We trigger at the same time of day as the original event. Generally,
// this means that you should get invoiced at a reasonable local time in
// most cases, unless you subscribed at 1AM or something.
$hms = $start->format('G:i:s');
// Increment the month by 1.
$month = $month + 1;
// If we ran off the end of the calendar, set the month back to January
// and increment the year by 1.
if ($month > 12) {
$month = 1;
$year = $year + 1;
}
// Now, move the day backward until it falls in the correct month. If we
// pass an invalid date like "2014-2-31", it will internally be parsed
// as though we had passed "2014-3-3".
while (true) {
$next = new DateTime("{$year}-{$month}-{$day} {$hms} UTC");
if ($next->format('n') == $month) {
// The month didn't get corrected forward, so we're all set.
break;
} else {
// The month did get corrected forward, so back off a day.
$day--;
}
}
return (int)$next->format('U');
}
}

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