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PhabricatorSystemActionEngine.php
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Fri, Feb 7, 14:22

PhabricatorSystemActionEngine.php
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<?php
final class PhabricatorSystemActionEngine extends Phobject {
public static function willTakeAction(
array $actors,
PhabricatorSystemAction $action,
$score) {
// If the score for this action is negative, we're giving the user a credit,
// so don't bother checking if they're blocked or not.
if ($score >= 0) {
$blocked = self::loadBlockedActors($actors, $action, $score);
if ($blocked) {
foreach ($blocked as $actor => $actor_score) {
throw new PhabricatorSystemActionRateLimitException(
$action,
$actor_score);
}
}
}
$unguarded = AphrontWriteGuard::beginScopedUnguardedWrites();
self::recordAction($actors, $action, $score);
unset($unguarded);
}
public static function loadBlockedActors(
array $actors,
PhabricatorSystemAction $action,
$score) {
$scores = self::loadScores($actors, $action);
$window = self::getWindow();
$blocked = array();
foreach ($scores as $actor => $actor_score) {
$actor_score = $actor_score + ($score / $window);
if ($action->shouldBlockActor($actor, $actor_score)) {
$blocked[$actor] = $actor_score;
}
}
return $blocked;
}
public static function loadScores(
array $actors,
PhabricatorSystemAction $action) {
if (!$actors) {
return array();
}
$actor_hashes = array();
foreach ($actors as $actor) {
$actor_hashes[] = PhabricatorHash::digestForIndex($actor);
}
$log = new PhabricatorSystemActionLog();
$window = self::getWindow();
$conn_r = $log->establishConnection('r');
$scores = queryfx_all(
$conn_r,
'SELECT actorIdentity, SUM(score) totalScore FROM %T
WHERE action = %s AND actorHash IN (%Ls)
AND epoch >= %d GROUP BY actorHash',
$log->getTableName(),
$action->getActionConstant(),
$actor_hashes,
(time() - $window));
$scores = ipull($scores, 'totalScore', 'actorIdentity');
foreach ($scores as $key => $score) {
$scores[$key] = $score / $window;
}
$scores = $scores + array_fill_keys($actors, 0);
return $scores;
}
private static function recordAction(
array $actors,
PhabricatorSystemAction $action,
$score) {
$log = new PhabricatorSystemActionLog();
$conn_w = $log->establishConnection('w');
$sql = array();
foreach ($actors as $actor) {
$sql[] = qsprintf(
$conn_w,
'(%s, %s, %s, %f, %d)',
PhabricatorHash::digestForIndex($actor),
$actor,
$action->getActionConstant(),
$score,
time());
}
foreach (PhabricatorLiskDAO::chunkSQL($sql) as $chunk) {
queryfx(
$conn_w,
'INSERT INTO %T (actorHash, actorIdentity, action, score, epoch)
VALUES %Q',
$log->getTableName(),
$chunk);
}
}
private static function getWindow() {
// Limit queries to the last hour of data so we don't need to look at as
// many rows. We can use an arbitrarily larger window instead (we normalize
// scores to actions per second) but all the actions we care about limiting
// have a limit much higher than one action per hour.
return phutil_units('1 hour in seconds');
}
}

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