/**
* Prunes Snapshots for the Given Volume
*
* @param string $volumeId
* @param boolean $dryRun (Optional) Indicates if we should perform a dry run
* @throws InvalidArgumentException if the volume id is not valid or $weeks is not numeric
* @return App_Service_Amazon_Ec2_EbsSnapshotPruneResult
*/
public function prune($volumeId, $dryRun = false)
{
if (!$this->_volumeExists($volumeId)) {
throw new InvalidArgumentException('The provided "' . $volumeId . '" volume does not exist');
}
// Storage mechanism for to-be saved snapshots
$save = array('month-first-day' => array(), 'sundays' => array(), 'past-week' => array(), 'only' => array());
$delete = array();
$savedAtLeastOne = false;
foreach ($this->_ebs->describeSnapshot() as $s) {
if (strcasecmp($s['volumeId'], $volumeId) !== 0) {
continue;
}
$obj = new App_Service_Amazon_Ec2_EbsSnapshot($s);
if ($obj->monthsElapsed() >= 1 && $obj->isFirstDayOfTheMonth() && !isset($save['month-first-day'][$obj->monthsElapsed()])) {
$save['month-first-day'][$obj->monthsElapsed()] = $obj;
$savedAtLeastOne = true;
} else {
if ($obj->weeksElapsed() > 0 && $obj->weeksElapsed() < 4 && $obj->isSunday() && !isset($save['sundays'][$obj->weeksElapsed()])) {
$save['sundays'][$obj->weeksElapsed()] = $obj;
$savedAtLeastOne = true;
} else {
if ($obj->weeksElapsed() == 0) {
$save['past-week'][] = $obj;
$savedAtLeastOne = true;
} else {
$delete[] = $obj;
}
}
}
}
// Make sure we leave at least one backup
// @todo: make this a config option
if (!$savedAtLeastOne && !empty($delete)) {
$newest['time'] = 0;
$newest['obj'] = null;
$newest['index'] = null;
foreach ($delete as $k => $d) {
/* @var $d App_Service_Amazon_Ec2_EbsSnapshot */
$data = $d->getData();
if (strtotime($data['startTime']) > $newest['time']) {
$newest['obj'] = $d;
$newest['index'] = $k;
$newest['time'] = strtotime($data['startTime']);
}
}
if (empty($newest['obj'])) {
throw new RuntimeException('Sanity check failed. There should be at ' . 'least one backup to be saved');
}
unset($delete[$newest['index']]);
// rekey delete
$delete = array_values($delete);
}
$result = new App_Service_Amazon_Ec2_EbsSnapshotPruneResult();
$result->setDeleted($delete);
$result->setKept($save);
if ($dryRun) {
$result->setDryRun(true);
return $result;
}
foreach ($delete as $d) {
/* @var $d App_Service_Amazon_Ec2_EbsSnapshot */
$data = $d->getData();
if (!array_key_exists('snapshotId', $data)) {
continue;
}
try {
$this->_ebs->deleteSnapshot($data['snapshotId']);
} catch (Zend_Service_Amazon_Ec2_Exception $e) {
if (!strstr($e->getMessage(), 'is currently in use by ami')) {
throw $e;
}
$result->addWarning($e->getMessage());
}
}
return $result;
}
/**
* Make sure we get the data as we sent it
* @return void
*/
public function testGetData()
{
$this->assertEquals($this->_data, $this->_snapshot->getData());
}