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<?php
namespace OpenCloud\Common\Resource;
use OpenCloud\Common\Error\BadResponseError;
/**
* Contains reusable functionality for resources that have long operations which require waiting in
* order to reach a particular state.
*
* @codeCoverageIgnore
*
* @package OpenCloud\Common\Resource
*/
trait HasWaiterTrait
{
/**
* Provides a blocking operation until the resource has reached a particular state. The method
* will enter a loop, requesting feedback from the remote API until it sends back an appropriate
* status.
*
* @param string $status The state to be reached
* @param int $timeout The maximum timeout. If the total time taken by the waiter has reached
* or exceed this timeout, the blocking operation will immediately cease.
* @param int $sleepPeriod The amount of time to pause between each HTTP request.
*/
public function waitUntil($status, $timeout = 60, $sleepPeriod = 1)
{
$startTime = time();
while (true) {
$this->retrieve();
if ($this->status == $status || $this->shouldHalt($timeout, $startTime)) {
break;
}
sleep($sleepPeriod);
}
}
/**
* Provides a blocking operation until the resource has reached a particular state. The method
* will enter a loop, executing the callback until TRUE is returned. This provides great
* flexibility.
*
* @param callable $fn An anonymous function that will be executed on every iteration. You can
* encapsulate your own logic to determine whether the resource has
* successfully transitioned. When TRUE is returned by the callback,
* the loop will end.
* @param int|bool $timeout The maximum timeout in seconds. If the total time taken by the waiter has reached
* or exceed this timeout, the blocking operation will immediately cease. If FALSE
* is provided, the timeout will never be considered.
* @param int $sleepPeriod The amount of time to pause between each HTTP request.
*/
public function waitWithCallback(callable $fn, $timeout = 60, $sleepPeriod = 1)
{
$startTime = time();
while (true) {
$this->retrieve();
$response = call_user_func_array($fn, [$this]);
if ($response === true || $this->shouldHalt($timeout, $startTime)) {
break;
}
sleep($sleepPeriod);
}
}
/**
* Internal method used to identify whether a timeout has been exceeded.
*
* @param bool|int $timeout
* @param int $startTime
*
* @return bool
*/
private function shouldHalt($timeout, $startTime)
{
if ($timeout === false) {
return false;
}
return time() - $startTime >= $timeout;
}
/**
* Convenience method providing a blocking operation until the resource transitions to an
* ``ACTIVE`` status.
*
* @param int|bool $timeout The maximum timeout in seconds. If the total time taken by the waiter has reached
* or exceed this timeout, the blocking operation will immediately cease. If FALSE
* is provided, the timeout will never be considered.
*/
public function waitUntilActive($timeout = false)
{
$this->waitUntil('ACTIVE', $timeout);
}
public function waitUntilDeleted($timeout = 60, $sleepPeriod = 1)
{
$startTime = time();
while (true) {
try {
$this->retrieve();
} catch (BadResponseError $e) {
if ($e->getResponse()->getStatusCode() === 404) {
break;
}
throw $e;
}
if ($this->shouldHalt($timeout, $startTime)) {
break;
}
sleep($sleepPeriod);
}
}
}
|
