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phab/src/applications/herald/engine/HeraldEngine.php
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HeraldEngine.php
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<?php
final class HeraldEngine {
protected $rules = array();
protected $results = array();
protected $stack = array();
protected $activeRule = null;
protected $fieldCache = array();
protected $object = null;
private $dryRun;
public function setDryRun($dry_run) {
$this->dryRun = $dry_run;
return $this;
}
public function getDryRun() {
return $this->dryRun;
}
public function getRule($phid) {
return idx($this->rules, $phid);
}
public function loadRulesForAdapter(HeraldAdapter $adapter) {
return id(new HeraldRuleQuery())
->setViewer(PhabricatorUser::getOmnipotentUser())
->withDisabled(false)
->withContentTypes(array($adapter->getAdapterContentType()))
->needConditionsAndActions(true)
->needAppliedToPHIDs(array($adapter->getPHID()))
->needValidateAuthors(true)
->execute();
}
public static function loadAndApplyRules(HeraldAdapter $adapter) {
$engine = new HeraldEngine();
$rules = $engine->loadRulesForAdapter($adapter);
$effects = $engine->applyRules($rules, $adapter);
$engine->applyEffects($effects, $adapter, $rules);
return $engine->getTranscript();
}
public function applyRules(array $rules, HeraldAdapter $object) {
assert_instances_of($rules, 'HeraldRule');
$t_start = microtime(true);
// Rules execute in a well-defined order: sort them into execution order.
$rules = msort($rules, 'getRuleExecutionOrderSortKey');
$rules = mpull($rules, null, 'getPHID');
$this->transcript = new HeraldTranscript();
$this->transcript->setObjectPHID((string)$object->getPHID());
$this->fieldCache = array();
$this->results = array();
$this->rules = $rules;
$this->object = $object;
$effects = array();
foreach ($rules as $phid => $rule) {
$this->stack = array();
$policy_first = HeraldRepetitionPolicyConfig::FIRST;
$policy_first_int = HeraldRepetitionPolicyConfig::toInt($policy_first);
$is_first_only = ($rule->getRepetitionPolicy() == $policy_first_int);
try {
if (!$this->getDryRun() &&
$is_first_only &&
$rule->getRuleApplied($object->getPHID())) {
// This is not a dry run, and this rule is only supposed to be
// applied a single time, and it's already been applied...
// That means automatic failure.
$xscript = id(new HeraldRuleTranscript())
->setRuleID($rule->getID())
->setResult(false)
->setRuleName($rule->getName())
->setRuleOwner($rule->getAuthorPHID())
->setReason(
'This rule is only supposed to be repeated a single time, '.
'and it has already been applied.');
$this->transcript->addRuleTranscript($xscript);
$rule_matches = false;
} else {
$rule_matches = $this->doesRuleMatch($rule, $object);
}
} catch (HeraldRecursiveConditionsException $ex) {
$names = array();
foreach ($this->stack as $rule_id => $ignored) {
$names[] = '"'.$rules[$rule_id]->getName().'"';
}
$names = implode(', ', $names);
foreach ($this->stack as $rule_id => $ignored) {
$xscript = new HeraldRuleTranscript();
$xscript->setRuleID($rule_id);
$xscript->setResult(false);
$xscript->setReason(
"Rules {$names} are recursively dependent upon one another! ".
"Don't do this! You have formed an unresolvable cycle in the ".
"dependency graph!");
$xscript->setRuleName($rules[$rule_id]->getName());
$xscript->setRuleOwner($rules[$rule_id]->getAuthorPHID());
$this->transcript->addRuleTranscript($xscript);
}
$rule_matches = false;
}
$this->results[$phid] = $rule_matches;
if ($rule_matches) {
foreach ($this->getRuleEffects($rule, $object) as $effect) {
$effects[] = $effect;
}
}
}
$object_transcript = new HeraldObjectTranscript();
$object_transcript->setPHID($object->getPHID());
$object_transcript->setName($object->getHeraldName());
$object_transcript->setType($object->getAdapterContentType());
$object_transcript->setFields($this->fieldCache);
$this->transcript->setObjectTranscript($object_transcript);
$t_end = microtime(true);
$this->transcript->setDuration($t_end - $t_start);
return $effects;
}
public function applyEffects(
array $effects,
HeraldAdapter $adapter,
array $rules) {
assert_instances_of($effects, 'HeraldEffect');
assert_instances_of($rules, 'HeraldRule');
$this->transcript->setDryRun((int)$this->getDryRun());
if ($this->getDryRun()) {
$xscripts = array();
foreach ($effects as $effect) {
$xscripts[] = new HeraldApplyTranscript(
$effect,
false,
pht('This was a dry run, so no actions were actually taken.'));
}
} else {
$xscripts = $adapter->applyHeraldEffects($effects);
}
assert_instances_of($xscripts, 'HeraldApplyTranscript');
foreach ($xscripts as $apply_xscript) {
$this->transcript->addApplyTranscript($apply_xscript);
}
// For dry runs, don't mark the rule as having applied to the object.
if ($this->getDryRun()) {
return;
}
$rules = mpull($rules, null, 'getID');
$applied_ids = array();
$first_policy = HeraldRepetitionPolicyConfig::toInt(
HeraldRepetitionPolicyConfig::FIRST);
// Mark all the rules that have had their effects applied as having been
// executed for the current object.
$rule_ids = mpull($xscripts, 'getRuleID');
foreach ($rule_ids as $rule_id) {
if (!$rule_id) {
// Some apply transcripts are purely informational and not associated
// with a rule, e.g. carryover emails from earlier revisions.
continue;
}
$rule = idx($rules, $rule_id);
if (!$rule) {
continue;
}
if ($rule->getRepetitionPolicy() == $first_policy) {
$applied_ids[] = $rule_id;
}
}
if ($applied_ids) {
$conn_w = id(new HeraldRule())->establishConnection('w');
$sql = array();
foreach ($applied_ids as $id) {
$sql[] = qsprintf(
$conn_w,
'(%s, %d)',
$adapter->getPHID(),
$id);
}
queryfx(
$conn_w,
'INSERT IGNORE INTO %T (phid, ruleID) VALUES %Q',
HeraldRule::TABLE_RULE_APPLIED,
implode(', ', $sql));
}
}
public function getTranscript() {
$this->transcript->save();
return $this->transcript;
}
public function doesRuleMatch(
HeraldRule $rule,
HeraldAdapter $object) {
$phid = $rule->getPHID();
if (isset($this->results[$phid])) {
// If we've already evaluated this rule because another rule depends
// on it, we don't need to reevaluate it.
return $this->results[$phid];
}
if (isset($this->stack[$phid])) {
// We've recursed, fail all of the rules on the stack. This happens when
// there's a dependency cycle with "Rule conditions match for rule ..."
// conditions.
foreach ($this->stack as $rule_phid => $ignored) {
$this->results[$rule_phid] = false;
}
throw new HeraldRecursiveConditionsException();
}
$this->stack[$phid] = true;
$all = $rule->getMustMatchAll();
$conditions = $rule->getConditions();
$result = null;
$local_version = id(new HeraldRule())->getConfigVersion();
if ($rule->getConfigVersion() > $local_version) {
$reason = pht(
'Rule could not be processed, it was created with a newer version '.
'of Herald.');
$result = false;
} else if (!$conditions) {
$reason = pht(
'Rule failed automatically because it has no conditions.');
$result = false;
} else if (!$rule->hasValidAuthor()) {
$reason = pht(
'Rule failed automatically because its owner is invalid '.
'or disabled.');
$result = false;
} else if (!$this->canAuthorViewObject($rule, $object)) {
$reason = pht(
'Rule failed automatically because it is a personal rule and its '.
'owner can not see the object.');
$result = false;
} else if (!$this->canRuleApplyToObject($rule, $object)) {
$reason = pht(
'Rule failed automatically because it is an object rule which is '.
'not relevant for this object.');
$result = false;
} else {
foreach ($conditions as $condition) {
$match = $this->doesConditionMatch($rule, $condition, $object);
if (!$all && $match) {
$reason = 'Any condition matched.';
$result = true;
break;
}
if ($all && !$match) {
$reason = 'Not all conditions matched.';
$result = false;
break;
}
}
if ($result === null) {
if ($all) {
$reason = 'All conditions matched.';
$result = true;
} else {
$reason = 'No conditions matched.';
$result = false;
}
}
}
$rule_transcript = new HeraldRuleTranscript();
$rule_transcript->setRuleID($rule->getID());
$rule_transcript->setResult($result);
$rule_transcript->setReason($reason);
$rule_transcript->setRuleName($rule->getName());
$rule_transcript->setRuleOwner($rule->getAuthorPHID());
$this->transcript->addRuleTranscript($rule_transcript);
return $result;
}
protected function doesConditionMatch(
HeraldRule $rule,
HeraldCondition $condition,
HeraldAdapter $object) {
$object_value = $this->getConditionObjectValue($condition, $object);
$test_value = $condition->getValue();
$cond = $condition->getFieldCondition();
$transcript = new HeraldConditionTranscript();
$transcript->setRuleID($rule->getID());
$transcript->setConditionID($condition->getID());
$transcript->setFieldName($condition->getFieldName());
$transcript->setCondition($cond);
$transcript->setTestValue($test_value);
try {
$result = $object->doesConditionMatch(
$this,
$rule,
$condition,
$object_value);
} catch (HeraldInvalidConditionException $ex) {
$result = false;
$transcript->setNote($ex->getMessage());
}
$transcript->setResult($result);
$this->transcript->addConditionTranscript($transcript);
return $result;
}
protected function getConditionObjectValue(
HeraldCondition $condition,
HeraldAdapter $object) {
$field = $condition->getFieldName();
return $this->getObjectFieldValue($field);
}
public function getObjectFieldValue($field) {
if (isset($this->fieldCache[$field])) {
return $this->fieldCache[$field];
}
$result = $this->object->getHeraldField($field);
$this->fieldCache[$field] = $result;
return $result;
}
protected function getRuleEffects(
HeraldRule $rule,
HeraldAdapter $object) {
$effects = array();
foreach ($rule->getActions() as $action) {
$effect = new HeraldEffect();
$effect->setObjectPHID($object->getPHID());
$effect->setAction($action->getAction());
$effect->setTarget($action->getTarget());
$effect->setRuleID($rule->getID());
$effect->setRulePHID($rule->getPHID());
$name = $rule->getName();
$id = $rule->getID();
$effect->setReason(
pht(
'Conditions were met for %s',
"H{$id} {$name}"));
$effects[] = $effect;
}
return $effects;
}
private function canAuthorViewObject(
HeraldRule $rule,
HeraldAdapter $adapter) {
// Authorship is irrelevant for global rules and object rules.
if ($rule->isGlobalRule() || $rule->isObjectRule()) {
return true;
}
// The author must be able to create rules for the adapter's content type.
// In particular, this means that the application must be installed and
// accessible to the user. For example, if a user writes a Differential
// rule and then loses access to Differential, this disables the rule.
$enabled = HeraldAdapter::getEnabledAdapterMap($rule->getAuthor());
if (empty($enabled[$adapter->getAdapterContentType()])) {
return false;
}
// Finally, the author must be able to see the object itself. You can't
// write a personal rule that CC's you on revisions you wouldn't otherwise
// be able to see, for example.
$object = $adapter->getObject();
return PhabricatorPolicyFilter::hasCapability(
$rule->getAuthor(),
$object,
PhabricatorPolicyCapability::CAN_VIEW);
}
private function canRuleApplyToObject(
HeraldRule $rule,
HeraldAdapter $adapter) {
// Rules which are not object rules can apply to anything.
if (!$rule->isObjectRule()) {
return true;
}
$trigger_phid = $rule->getTriggerObjectPHID();
$object_phids = $adapter->getTriggerObjectPHIDs();
if ($object_phids) {
if (in_array($trigger_phid, $object_phids)) {
return true;
}
}
return false;
}
}
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