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PhabricatorElasticFulltextStorageEngine.php
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Tue, Aug 27, 19:28

PhabricatorElasticFulltextStorageEngine.php
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<?php
class PhabricatorElasticFulltextStorageEngine
extends PhabricatorFulltextStorageEngine {
private $index;
private $timeout;
private $version;
public function setService(PhabricatorSearchService $service) {
$this->service = $service;
$config = $service->getConfig();
$index = idx($config, 'path', '/phabricator');
$this->index = str_replace('/', '', $index);
$this->timeout = idx($config, 'timeout', 15);
$this->version = (int)idx($config, 'version', 5);
return $this;
}
public function getEngineIdentifier() {
return 'elasticsearch';
}
public function getTimestampField() {
return $this->version < 2 ?
'_timestamp' : 'lastModified';
}
public function getTextFieldType() {
return $this->version >= 5
? 'text' : 'string';
}
public function getHostType() {
return new PhabricatorElasticsearchHost($this);
}
public function getHostForRead() {
return $this->getService()->getAnyHostForRole('read');
}
public function getHostForWrite() {
return $this->getService()->getAnyHostForRole('write');
}
public function setTimeout($timeout) {
$this->timeout = $timeout;
return $this;
}
public function getTimeout() {
return $this->timeout;
}
public function getTypeConstants($class) {
$relationship_class = new ReflectionClass($class);
$typeconstants = $relationship_class->getConstants();
return array_unique(array_values($typeconstants));
}
public function reindexAbstractDocument(
PhabricatorSearchAbstractDocument $doc) {
$host = $this->getHostForWrite();
$type = $doc->getDocumentType();
$phid = $doc->getPHID();
$handle = id(new PhabricatorHandleQuery())
->setViewer(PhabricatorUser::getOmnipotentUser())
->withPHIDs(array($phid))
->executeOne();
$timestamp_key = $this->getTimestampField();
$spec = array(
'title' => $doc->getDocumentTitle(),
'dateCreated' => $doc->getDocumentCreated(),
$timestamp_key => $doc->getDocumentModified(),
);
foreach ($doc->getFieldData() as $field) {
list($field_name, $corpus, $aux) = $field;
if (!isset($spec[$field_name])) {
$spec[$field_name] = array($corpus);
} else {
$spec[$field_name][] = $corpus;
}
if ($aux != null) {
$spec[$field_name][] = $aux;
}
}
foreach ($doc->getRelationshipData() as $field) {
list($field_name, $related_phid, $rtype, $time) = $field;
if (!isset($spec[$field_name])) {
$spec[$field_name] = array($related_phid);
} else {
$spec[$field_name][] = $related_phid;
}
if ($time) {
$spec[$field_name.'_ts'] = $time;
}
}
$this->executeRequest($host, "/{$type}/{$phid}/", $spec, 'PUT');
}
private function buildSpec(PhabricatorSavedQuery $query) {
$q = new PhabricatorElasticsearchQueryBuilder('bool');
$query_string = $query->getParameter('query');
if (strlen($query_string)) {
$fields = $this->getTypeConstants('PhabricatorSearchDocumentFieldType');
// Build a simple_query_string query over all fields that must match all
// of the words in the search string.
$q->addMustClause(array(
'simple_query_string' => array(
'query' => $query_string,
'fields' => array(
PhabricatorSearchDocumentFieldType::FIELD_TITLE.'.*',
PhabricatorSearchDocumentFieldType::FIELD_BODY.'.*',
PhabricatorSearchDocumentFieldType::FIELD_COMMENT.'.*',
),
'default_operator' => 'AND',
),
));
// This second query clause is "SHOULD' so it only affects ranking of
// documents which already matched the Must clause. This amplifies the
// score of documents which have an exact match on title, body
// or comments.
$q->addShouldClause(array(
'simple_query_string' => array(
'query' => $query_string,
'fields' => array(
'*.raw',
PhabricatorSearchDocumentFieldType::FIELD_TITLE.'^4',
PhabricatorSearchDocumentFieldType::FIELD_BODY.'^3',
PhabricatorSearchDocumentFieldType::FIELD_COMMENT.'^1.2',
),
'analyzer' => 'english_exact',
'default_operator' => 'and',
),
));
}
$exclude = $query->getParameter('exclude');
if ($exclude) {
$q->addFilterClause(array(
'not' => array(
'ids' => array(
'values' => array($exclude),
),
),
));
}
$relationship_map = array(
PhabricatorSearchRelationship::RELATIONSHIP_AUTHOR =>
$query->getParameter('authorPHIDs', 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) {
$q->addExistsClause($rel_open);
} else if (!$include_open && $include_closed) {
$q->addExistsClause($rel_closed);
}
if ($query->getParameter('withUnowned')) {
$q->addExistsClause($rel_unowned);
}
$rel_owner = PhabricatorSearchRelationship::RELATIONSHIP_OWNER;
if ($query->getParameter('withAnyOwner')) {
$q->addExistsClause($rel_owner);
} else {
$owner_phids = $query->getParameter('ownerPHIDs', array());
if (count($owner_phids)) {
$q->addTermsClause($rel_owner, $owner_phids);
}
}
foreach ($relationship_map as $field => $phids) {
if (is_array($phids) && !empty($phids)) {
$q->addTermsClause($field, $phids);
}
}
if (!$q->getClauseCount('must')) {
$q->addMustClause(array('match_all' => array('boost' => 1 )));
}
$spec = array(
'_source' => false,
'query' => array(
'bool' => $q->toArray(),
),
);
if (!$query->getParameter('query')) {
$spec['sort'] = array(
array('dateCreated' => 'desc'),
);
}
$offset = (int)$query->getParameter('offset', 0);
$limit = (int)$query->getParameter('limit', 101);
if ($offset + $limit > 10000) {
throw new Exception(pht(
'Query offset is too large. offset+limit=%s (max=%s)',
$offset + $limit,
10000));
}
$spec['from'] = $offset;
$spec['size'] = $limit;
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';
$spec = $this->buildSpec($query);
$exceptions = array();
foreach ($this->service->getAllHostsForRole('read') as $host) {
try {
$response = $this->executeRequest($host, $uri, $spec);
$phids = ipull($response['hits']['hits'], '_id');
return $phids;
} catch (Exception $e) {
$exceptions[] = $e;
}
}
throw new PhutilAggregateException(pht('All Fulltext Search hosts failed:'),
$exceptions);
}
public function indexExists(PhabricatorElasticsearchHost $host = null) {
if (!$host) {
$host = $this->getHostForRead();
}
try {
if ($this->version >= 5) {
$uri = '/_stats/';
$res = $this->executeRequest($host, $uri, array());
return isset($res['indices']['phabricator']);
} else if ($this->version >= 2) {
$uri = '';
} else {
$uri = '/_status/';
}
return (bool)$this->executeRequest($host, $uri, 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(
'english_stop' => array(
'type' => 'stop',
'stopwords' => '_english_',
),
'english_stemmer' => array(
'type' => 'stemmer',
'language' => 'english',
),
'english_possessive_stemmer' => array(
'type' => 'stemmer',
'language' => 'possessive_english',
),
),
'analyzer' => array(
'english_exact' => array(
'tokenizer' => 'standard',
'filter' => array('lowercase'),
),
'letter_stop' => array(
'tokenizer' => 'letter',
'filter' => array('lowercase', 'english_stop'),
),
'english_stem' => array(
'tokenizer' => 'standard',
'filter' => array(
'english_possessive_stemmer',
'lowercase',
'english_stop',
'english_stemmer',
),
),
),
),
),
);
$fields = $this->getTypeConstants('PhabricatorSearchDocumentFieldType');
$relationships = $this->getTypeConstants('PhabricatorSearchRelationship');
$doc_types = array_keys(
PhabricatorSearchApplicationSearchEngine::getIndexableDocumentTypes());
$text_type = $this->getTextFieldType();
foreach ($doc_types as $type) {
$properties = array();
foreach ($fields as $field) {
// Use the custom analyzer for the corpus of text
$properties[$field] = array(
'type' => $text_type,
'fields' => array(
'raw' => array(
'type' => $text_type,
'analyzer' => 'english_exact',
'search_analyzer' => 'english',
'search_quote_analyzer' => 'english_exact',
),
'keywords' => array(
'type' => $text_type,
'analyzer' => 'letter_stop',
),
'stems' => array(
'type' => $text_type,
'analyzer' => 'english_stem',
),
),
);
}
if ($this->version < 5) {
foreach ($relationships as $rel) {
$properties[$rel] = array(
'type' => 'string',
'index' => 'not_analyzed',
'include_in_all' => false,
);
$properties[$rel.'_ts'] = array(
'type' => 'date',
'include_in_all' => false,
);
}
} else {
foreach ($relationships as $rel) {
$properties[$rel] = array(
'type' => 'keyword',
'include_in_all' => false,
'doc_values' => false,
);
$properties[$rel.'_ts'] = array(
'type' => 'date',
'include_in_all' => false,
);
}
}
// Ensure we have dateCreated since the default query requires it
$properties['dateCreated']['type'] = 'date';
$properties['lastModified']['type'] = 'date';
$data['mappings'][$type]['properties'] = $properties;
}
return $data;
}
public function indexIsSane(PhabricatorElasticsearchHost $host = null) {
if (!$host) {
$host = $this->getHostForRead();
}
if (!$this->indexExists($host)) {
return false;
}
$cur_mapping = $this->executeRequest($host, '/_mapping/', array());
$cur_settings = $this->executeRequest($host, '/_settings/', array());
$actual = array_merge($cur_settings[$this->index],
$cur_mapping[$this->index]);
$res = $this->check($actual, $this->getIndexConfiguration());
return $res;
}
/**
* Recursively check if two Elasticsearch configuration arrays are equal
*
* @param $actual
* @param $required array
* @return bool
*/
private function check($actual, $required, $path = '') {
foreach ($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, $path.'.'.$key)) {
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() {
$host = $this->getHostForWrite();
if ($this->indexExists()) {
$this->executeRequest($host, '/', array(), 'DELETE');
}
$data = $this->getIndexConfiguration();
$this->executeRequest($host, '/', $data, 'PUT');
}
public function getIndexStats(PhabricatorElasticsearchHost $host = null) {
if ($this->version < 2) {
return false;
}
if (!$host) {
$host = $this->getHostForRead();
}
$uri = '/_stats/';
$res = $this->executeRequest($host, $uri, array());
$stats = $res['indices'][$this->index];
return array(
pht('Queries') =>
idxv($stats, array('primaries', 'search', 'query_total')),
pht('Documents') =>
idxv($stats, array('total', 'docs', 'count')),
pht('Deleted') =>
idxv($stats, array('total', 'docs', 'deleted')),
pht('Storage Used') =>
phutil_format_bytes(idxv($stats,
array('total', 'store', 'size_in_bytes'))),
);
}
private function executeRequest(PhabricatorElasticsearchHost $host, $path,
array $data, $method = 'GET') {
$uri = $host->getURI($path);
$data = phutil_json_encode($data);
$future = new HTTPSFuture($uri, $data);
$future->addHeader('Content-Type', 'application/json');
if ($method != 'GET') {
$future->setMethod($method);
}
if ($this->getTimeout()) {
$future->setTimeout($this->getTimeout());
}
try {
list($body) = $future->resolvex();
} catch (HTTPFutureResponseStatus $ex) {
if ($ex->isTimeout() || (int)$ex->getStatusCode() > 499) {
$host->didHealthCheck(false);
}
throw $ex;
}
if ($method != 'GET') {
return null;
}
try {
$data = phutil_json_decode($body);
$host->didHealthCheck(true);
return $data;
} catch (PhutilJSONParserException $ex) {
$host->didHealthCheck(false);
throw new PhutilProxyException(
pht('Elasticsearch server returned invalid JSON!'),
$ex);
}
}
}

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