HeraldEngine.php
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Created: Thu, May 9, 19:45

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);

	$rules = mpull($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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