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Clock Bundle for Symfony

Unit-Testing anything related to time is hard if the code under test directly accesses the system time. Therefor this bundle provides a clock service wrapping a DateTime instance that represents "now".

Another nice property is, that "now" remains the same during one request.

Usage Examples

The clock also contains some helper functions that help to create easily understandable code related to time.

Test, whether a user may try to login again

After some failures to login the user from a given IP address may not login for some minutes:

$clock->hasElapsed($blockingPeriod, $lastFailedLogin->getDateTime())

Without the helper methods this would look like:

((int)$lastFailedLogin->getDateTime()->format('U')) + $blockingPeriod >= $clock->getTimestamp()

Test, whether a token is still valid

$clock->isExpired($tokenExpirationTime)

Save a file with time as part of the filename

$fileName = $clock->getFileName() . '_datadump';
// e.g. $fileName === '2015-03-25_23-12-59_datadump'

Helper methods in class Clock

class Clock
{
    // SNIPP some stuff

    /**
     * Time representation usable as (part of) a file name, e.g.: 2014-05-23_13-45-23
     * @return string
     */
    public function getFileName()
    {
        return $this->now->format('Y-m-d_H-i-s');
    }

    /**
     * @return \DateTime
     */
    public function getDateTime()
    {
        return $this->now;
    }

    /**
     * @return int
     */
    public function getSeconds()
    {
        return (int)$this->now->format('U');
    }

    /**
     * @return int
     */
    public function getSecondsSince(\DateTimeInterface $past)
    {
        return $this->getSeconds() - (int)$past->format('U');
    }

    /**
     * @return int
     */
    public function getSecondsUntil(\DateTimeInterface $future)
    {
        return - $this->getSecondsSince($future);
    }

    /**
     * @return bool
     * @param int $seconds
     */
    public function hasElapsed($seconds, \DateTimeInterface $since)
    {
        return $this->getSecondsSince($since) > $seconds;
    }

    /**
     * @return bool
     */
    public function isExpired(\DateTimeInterface $expiryDate)
    {
        return (int)$this->now->format('U') > (int)$expiryDate->format('U');
    }

    /**
     * Create new DateTime object with the timezone of this clock
     *
     * @param String $time
     */
    public function createDateTime($time)
    {
        return (new \DateTime($time, $this->now->getTimezone()))->setTimezone($this->now->getTimezone());
    }

    /**
     * Returns an instance of DateTimeImmutable for the given implementation of DateTimeInterface.
     *
     * This method should rather exist in the DateTimeImmutable class but Derick Rethans doesn't
     * think so.
     *
     * @param \DateTimeInterface $datetime
     * @return \DateTimeImmutable
     */
    public static function createDateTimeImmutable(\DateTimeInterface $datetime)
    {
        if ($datetime instanceof \DateTimeImmutable)
        {
            return $datetime;
        }

        return \DateTimeImmutable::createFromMutable($datetime);
    }
}