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PhabricatorSearchEngineElastic.php
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Wed, Feb 19, 23:58

PhabricatorSearchEngineElastic.php
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<?php
final class PhabricatorSearchEngineElastic extends PhabricatorSearchEngine {
private $uri;
private $index;
private $timeout;
public function __construct($uri, $index) {
$this->uri = $uri;
$this->index = $index;
}
public function setTimeout($timeout) {
$this->timeout = $timeout;
return $this;
}
public function getTimeout() {
return $this->timeout;
}
public function reindexAbstractDocument(
PhabricatorSearchAbstractDocument $doc) {
$type = $doc->getDocumentType();
$phid = $doc->getPHID();
$handle = id(new PhabricatorHandleQuery())
->setViewer(PhabricatorUser::getOmnipotentUser())
->withPHIDs(array($phid))
->executeOne();
// URL is not used internally but it can be useful externally.
$spec = array(
'title' => $doc->getDocumentTitle(),
'url' => PhabricatorEnv::getProductionURI($handle->getURI()),
'dateCreated' => $doc->getDocumentCreated(),
'_timestamp' => $doc->getDocumentModified(),
'field' => array(),
'relationship' => array(),
);
foreach ($doc->getFieldData() as $field) {
$spec['field'][] = array_combine(array('type', 'corpus', 'aux'), $field);
}
foreach ($doc->getRelationshipData() as $relationship) {
list($rtype, $to_phid, $to_type, $time) = $relationship;
$spec['relationship'][$rtype][] = array(
'phid' => $to_phid,
'phidType' => $to_type,
'when' => $time,
);
}
$this->executeRequest("/{$type}/{$phid}/", $spec, 'PUT');
}
public function reconstructDocument($phid) {
$type = phid_get_type($phid);
$response = $this->executeRequest("/{$type}/{$phid}", array());
if (empty($response['exists'])) {
return null;
}
$hit = $response['_source'];
$doc = new PhabricatorSearchAbstractDocument();
$doc->setPHID($phid);
$doc->setDocumentType($response['_type']);
$doc->setDocumentTitle($hit['title']);
$doc->setDocumentCreated($hit['dateCreated']);
$doc->setDocumentModified($hit['_timestamp']);
foreach ($hit['field'] as $fdef) {
$doc->addField($fdef['type'], $fdef['corpus'], $fdef['aux']);
}
foreach ($hit['relationship'] as $rtype => $rships) {
foreach ($rships as $rship) {
$doc->addRelationship(
$rtype,
$rship['phid'],
$rship['phidType'],
$rship['when']);
}
}
return $doc;
}
private function buildSpec(PhabricatorSavedQuery $query) {
$spec = array();
$filter = array();
if (strlen($query->getParameter('query'))) {
$spec[] = array(
'simple_query_string' => array(
'query' => $query->getParameter('query'),
'fields' => array( 'field.corpus' ),
),
);
}
$exclude = $query->getParameter('exclude');
if ($exclude) {
$filter[] = array(
'not' => array(
'ids' => array(
'values' => array($exclude),
),
),
);
}
$relationship_map = array(
PhabricatorSearchRelationship::RELATIONSHIP_AUTHOR =>
$query->getParameter('authorPHIDs', array()),
PhabricatorSearchRelationship::RELATIONSHIP_OWNER =>
$query->getParameter('ownerPHIDs', array()),
PhabricatorSearchRelationship::RELATIONSHIP_SUBSCRIBER =>
$query->getParameter('subscriberPHIDs', array()),
PhabricatorSearchRelationship::RELATIONSHIP_PROJECT =>
$query->getParameter('projectPHIDs', array()),
PhabricatorSearchRelationship::RELATIONSHIP_REPOSITORY =>
$query->getParameter('repositoryPHIDs', array()),
);
$statuses = $query->getParameter('statuses', array());
$statuses = array_fuse($statuses);
$rel_open = PhabricatorSearchRelationship::RELATIONSHIP_OPEN;
$rel_closed = PhabricatorSearchRelationship::RELATIONSHIP_CLOSED;
$rel_unowned = PhabricatorSearchRelationship::RELATIONSHIP_UNOWNED;
$include_open = !empty($statuses[$rel_open]);
$include_closed = !empty($statuses[$rel_closed]);
if ($include_open && !$include_closed) {
$relationship_map[$rel_open] = true;
} else if (!$include_open && $include_closed) {
$relationship_map[$rel_closed] = true;
}
if ($query->getParameter('withUnowned')) {
$relationship_map[$rel_unowned] = true;
}
foreach ($relationship_map as $field => $param) {
if (is_array($param) && $param) {
$should = array();
foreach ($param as $val) {
$should[] = array(
'match' => array(
"relationship.{$field}.phid" => array(
'query' => $val,
'type' => 'phrase',
),
),
);
}
// We couldn't solve it by minimum_number_should_match because it can
// match multiple owners without matching author.
$spec[] = array('bool' => array('should' => $should));
} else if ($param) {
$filter[] = array(
'exists' => array(
'field' => "relationship.{$field}.phid",
),
);
}
}
if ($spec) {
$spec = array('query' => array('bool' => array('must' => $spec)));
}
if ($filter) {
$filter = array('filter' => array('and' => $filter));
if (!$spec) {
$spec = array('query' => array('match_all' => new stdClass()));
}
$spec = array(
'query' => array(
'filtered' => $spec + $filter,
),
);
}
if (!$query->getParameter('query')) {
$spec['sort'] = array(
array('dateCreated' => 'desc'),
);
}
$spec['from'] = (int)$query->getParameter('offset', 0);
$spec['size'] = (int)$query->getParameter('limit', 25);
return $spec;
}
public function executeSearch(PhabricatorSavedQuery $query) {
$types = $query->getParameter('types');
if (!$types) {
$types = array_keys(
PhabricatorSearchApplicationSearchEngine::getIndexableDocumentTypes());
}
// Don't use '/_search' for the case that there is something
// else in the index (for example if 'phabricator' is only an alias to
// some bigger index). Use '/$types/_search' instead.
$uri = '/'.implode(',', $types).'/_search';
try {
$response = $this->executeRequest($uri, $this->buildSpec($query));
} catch (HTTPFutureHTTPResponseStatus $ex) {
// elasticsearch probably uses Lucene query syntax:
// http://lucene.apache.org/core/3_6_1/queryparsersyntax.html
// Try literal search if operator search fails.
if (!strlen($query->getParameter('query'))) {
throw $ex;
}
$query = clone $query;
$query->setParameter(
'query',
addcslashes(
$query->getParameter('query'), '+-&|!(){}[]^"~*?:\\'));
$response = $this->executeRequest($uri, $this->buildSpec($query));
}
$phids = ipull($response['hits']['hits'], '_id');
return $phids;
}
public function indexExists() {
try {
return (bool)$this->executeRequest('/_status/', array());
} catch (HTTPFutureHTTPResponseStatus $e) {
if ($e->getStatusCode() == 404) {
return false;
}
throw $e;
}
}
private function getIndexConfiguration() {
$data = array();
$data['settings'] = array(
'index' => array(
'auto_expand_replicas' => '0-2',
'analysis' => array(
'filter' => array(
'trigrams_filter' => array(
'min_gram' => 3,
'type' => 'ngram',
'max_gram' => 3,
),
),
'analyzer' => array(
'custom_trigrams' => array(
'type' => 'custom',
'filter' => array(
'lowercase',
'kstem',
'trigrams_filter',
),
'tokenizer' => 'standard',
),
),
),
),
);
$types = array_keys(
PhabricatorSearchApplicationSearchEngine::getIndexableDocumentTypes());
foreach ($types as $type) {
$data['mappings'][$type]['properties']['field']['properties']['corpus'] =
array( 'type' => 'string', 'analyzer' => 'custom_trigrams' );
}
return $data;
}
public function indexIsSane() {
if (!$this->indexExists()) {
return false;
}
$cur_mapping = $this->executeRequest('/_mapping/', array());
$cur_settings = $this->executeRequest('/_settings/', array());
$actual = array_merge($cur_settings[$this->index],
$cur_mapping[$this->index]);
return $this->check($actual, $this->getIndexConfiguration());
}
/**
* Recursively check if two Elasticsearch configuration arrays are equal
*
* @param $actual
* @param $required array
* @return bool
*/
private function check($actual, $required) {
foreach ($required as $key => $value) {
if (!array_key_exists($key, $actual)) {
if ($key === '_all') {
// The _all field never comes back so we just have to assume it
// is set correctly.
continue;
}
return false;
}
if (is_array($value)) {
if (!is_array($actual[$key])) {
return false;
}
if (!$this->check($actual[$key], $value)) {
return false;
}
continue;
}
$actual[$key] = self::normalizeConfigValue($actual[$key]);
$value = self::normalizeConfigValue($value);
if ($actual[$key] != $value) {
return false;
}
}
return true;
}
/**
* Normalize a config value for comparison. Elasticsearch accepts all kinds
* of config values but it tends to throw back 'true' for true and 'false' for
* false so we normalize everything. Sometimes, oddly, it'll throw back false
* for false....
*
* @param mixed $value config value
* @return mixed value normalized
*/
private static function normalizeConfigValue($value) {
if ($value === true) {
return 'true';
} else if ($value === false) {
return 'false';
}
return $value;
}
public function initIndex() {
if ($this->indexExists()) {
$this->executeRequest('/', array(), 'DELETE');
}
$data = $this->getIndexConfiguration();
$this->executeRequest('/', $data, 'PUT');
}
private function executeRequest($path, array $data, $method = 'GET') {
$uri = new PhutilURI($this->uri);
$uri->setPath($this->index);
$uri->appendPath($path);
$data = json_encode($data);
$future = new HTTPSFuture($uri, $data);
if ($method != 'GET') {
$future->setMethod($method);
}
if ($this->getTimeout()) {
$future->setTimeout($this->getTimeout());
}
list($body) = $future->resolvex();
if ($method != 'GET') {
return null;
}
$body = json_decode($body, true);
if (!is_array($body)) {
throw new Exception('elasticsearch server returned invalid JSON!');
}
return $body;
}
}

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