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PhabricatorRepositoryDiscoveryEngine.php
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Sat, May 31, 05:15

PhabricatorRepositoryDiscoveryEngine.php
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<?php
/**
* @task discover Discovering Repositories
* @task svn Discovering Subversion Repositories
* @task git Discovering Git Repositories
* @task hg Discovering Mercurial Repositories
* @task internal Internals
*/
final class PhabricatorRepositoryDiscoveryEngine
extends PhabricatorRepositoryEngine {
private $repairMode;
private $commitCache = array();
const MAX_COMMIT_CACHE_SIZE = 2048;
/* -( Discovering Repositories )------------------------------------------- */
public function setRepairMode($repair_mode) {
$this->repairMode = $repair_mode;
return $this;
}
public function getRepairMode() {
return $this->repairMode;
}
/**
* @task discovery
*/
public function discoverCommits() {
$repository = $this->getRepository();
$vcs = $repository->getVersionControlSystem();
switch ($vcs) {
case PhabricatorRepositoryType::REPOSITORY_TYPE_SVN:
$refs = $this->discoverSubversionCommits();
break;
/*
TODO: Implement these!
case PhabricatorRepositoryType::REPOSITORY_TYPE_GIT:
$refs = $this->executeGitDiscovery();
break;
case PhabricatorRepositoryType::REPOSITORY_TYPE_MERCURIAL:
$refs = $this->executeMercurialDiscovery();
break;
*/
default:
throw new Exception("Unknown VCS '{$vcs}'!");
}
// Mark discovered commits in the cache.
foreach ($refs as $ref) {
$this->commitCache[$ref->getIdentifier()] = true;
}
return $refs;
}
/* -( Discovering Subversion Repositories )-------------------------------- */
/**
* @task svn
*/
private function discoverSubversionCommits() {
$repository = $this->getRepository();
$upper_bound = null;
$limit = 1;
$refs = array();
do {
// Find all the unknown commits on this path. Note that we permit
// importing an SVN subdirectory rather than the entire repository, so
// commits may be nonsequential.
if ($upper_bound === null) {
$at_rev = 'HEAD';
} else {
$at_rev = ($upper_bound - 1);
}
try {
list($xml, $stderr) = $repository->execxRemoteCommand(
'log --xml --quiet --limit %d %s@%s',
$limit,
$repository->getSubversionBaseURI(),
$at_rev);
} catch (CommandException $ex) {
$stderr = $ex->getStdErr();
if (preg_match('/(path|File) not found/', $stderr)) {
// We've gone all the way back through history and this path was not
// affected by earlier commits.
break;
}
throw $ex;
}
$xml = phutil_utf8ize($xml);
$log = new SimpleXMLElement($xml);
foreach ($log->logentry as $entry) {
$identifier = (int)$entry['revision'];
$epoch = (int)strtotime((string)$entry->date[0]);
$refs[$identifier] = id(new PhabricatorRepositoryCommitRef())
->setIdentifier($identifier)
->setEpoch($epoch);
if ($upper_bound === null) {
$upper_bound = $identifier;
} else {
$upper_bound = min($upper_bound, $identifier);
}
}
// Discover 2, 4, 8, ... 256 logs at a time. This allows us to initially
// import large repositories fairly quickly, while pulling only as much
// data as we need in the common case (when we've already imported the
// repository and are just grabbing one commit at a time).
$limit = min($limit * 2, 256);
} while ($upper_bound > 1 && !$this->isKnownCommit($upper_bound));
krsort($refs);
while ($refs && $this->isKnownCommit(last($refs)->getIdentifier())) {
array_pop($refs);
}
$refs = array_reverse($refs);
return $refs;
}
/* -( Internals )---------------------------------------------------------- */
private function isKnownCommit($identifier) {
if (isset($this->commitCache[$identifier])) {
return true;
}
if ($this->repairMode) {
// In repair mode, rediscover the entire repository, ignoring the
// database state. We can hit the local cache above, but if we miss it
// stop the script from going to the database cache.
return false;
}
$commit = id(new PhabricatorRepositoryCommit())->loadOneWhere(
'repositoryID = %d AND commitIdentifier = %s',
$this->getRepository()->getID(),
$identifier);
if (!$commit) {
return false;
}
$this->commitCache[$identifier] = true;
while (count($this->commitCache) > self::MAX_COMMIT_CACHE_SIZE) {
array_shift($this->commitCache);
}
return true;
}
}

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