/**
* Update the stack using the scaling profile specified in the supplied event.
*
* @param Stack $stack Model of stack to update.
* @param Event|null $event Model of event specifying the scaling profile,
* or null to use the default profile.
* @return bool Whether the stack has been updated.
*/
public function scale(Stack $stack, Event $event = null)
{
$this->logger->debug(sprintf('Attempting temporal scaling for stack "%s"', $stack->getName()));
$timeSinceLastUpdated = time() - $stack->getLastUpdatedTime()->getTimestamp();
if ($timeSinceLastUpdated < $this->minimumUpdateInterval) {
$this->logger->warn(sprintf('Not scaling stack "%s", as it was last updated %d seconds ago (less than the %d second minimum update interval)', $stack->getName(), $timeSinceLastUpdated, $this->minimumUpdateInterval));
return false;
}
if ($stack->getStatus() !== 'CREATE_COMPLETE' && $stack->getStatus() !== 'UPDATE_COMPLETE' && $stack->getStatus() !== 'ROLLBACK_COMPLETE') {
$this->logger->warn(sprintf('Not scaling stack "%s", as its current status ("%s") is not CREATE_COMPLETE, UPDATE_COMPLETE or ROLLBACK_COMPLETE', $stack->getName(), $stack->getStatus()));
return false;
}
$scalingProfile = $event === null ? 'default' : $event->getSummary();
if (!isset($this->scalingProfiles[$stack->getTemplate()->getName()][$scalingProfile])) {
$this->logger->error(sprintf('Not scaling stack "%s", no scaling profile with name "%s" found', $stack->getName(), $scalingProfile));
return false;
}
$newStack = $this->configStackMapper->create($stack->getTemplate()->getName(), $stack->getEnvironment(), $scalingProfile, $stack->getName());
$scalingProfileParameterKeys = array_keys($this->scalingProfiles[$stack->getTemplate()->getName()][$scalingProfile]);
$changedParameterKeys = array_keys(array_diff_assoc($newStack->getParameters()->toArray(), $stack->getParameters()->toArray()));
if (!$changedParameterKeys) {
$this->logger->info(sprintf('Not updating stack "%s" using scaling profile "%s" as no parameters have changed', $stack->getName(), $scalingProfile));
return false;
}
foreach ($changedParameterKeys as $key) {
if (!in_array($key, $scalingProfileParameterKeys)) {
$this->logger->warn(sprintf('Not updating stack "%s" as updating it would affect parameter "%s" that is not part of a scaling profile', $stack->getName(), $key));
return false;
}
}
$this->logger->info(sprintf('Updating stack "%s" using scaling profile "%s"', $stack->getName(), $scalingProfile));
$this->stackManager->update($newStack);
return true;
}