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PhabricatorRepositoryPullLocalDaemon.php
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Fri, Nov 22, 09:46

PhabricatorRepositoryPullLocalDaemon.php
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<?php
/**
* Run pull commands on local working copies to keep them up to date. This
* daemon handles all repository types.
*
* By default, the daemon pulls **every** repository. If you want it to be
* responsible for only some repositories, you can launch it with a list of
* PHIDs or callsigns:
*
* ./phd launch repositorypulllocal -- X Q Z
*
* You can also launch a daemon which is responsible for all //but// one or
* more repositories:
*
* ./phd launch repositorypulllocal -- --not A --not B
*
* If you have a very large number of repositories and some aren't being pulled
* as frequently as you'd like, you can either change the pull frequency of
* the less-important repositories to a larger number (so the daemon will skip
* them more often) or launch one daemon for all the less-important repositories
* and one for the more important repositories (or one for each more important
* repository).
*
* @task pull Pulling Repositories
*/
final class PhabricatorRepositoryPullLocalDaemon
extends PhabricatorDaemon {
private $statusMessageCursor = 0;
/* -( Pulling Repositories )----------------------------------------------- */
/**
* @task pull
*/
protected function run() {
$argv = $this->getArgv();
array_unshift($argv, __CLASS__);
$args = new PhutilArgumentParser($argv);
$args->parse(
array(
array(
'name' => 'no-discovery',
'help' => pht('Pull only, without discovering commits.'),
),
array(
'name' => 'not',
'param' => 'repository',
'repeat' => true,
'help' => pht('Do not pull __repository__.'),
),
array(
'name' => 'repositories',
'wildcard' => true,
'help' => pht('Pull specific __repositories__ instead of all.'),
),
));
$no_discovery = $args->getArg('no-discovery');
$include = $args->getArg('repositories');
$exclude = $args->getArg('not');
// Each repository has an individual pull frequency; after we pull it,
// wait that long to pull it again. When we start up, try to pull everything
// serially.
$retry_after = array();
$min_sleep = 15;
$max_futures = 4;
$futures = array();
$queue = array();
while (!$this->shouldExit()) {
$pullable = $this->loadPullableRepositories($include, $exclude);
// If any repositories have the NEEDS_UPDATE flag set, pull them
// as soon as possible.
$need_update_messages = $this->loadRepositoryUpdateMessages(true);
foreach ($need_update_messages as $message) {
$repo = idx($pullable, $message->getRepositoryID());
if (!$repo) {
continue;
}
$this->log(
pht(
'Got an update message for repository "%s"!',
$repo->getMonogram()));
$retry_after[$message->getRepositoryID()] = time();
}
// If any repositories were deleted, remove them from the retry timer map
// so we don't end up with a retry timer that never gets updated and
// causes us to sleep for the minimum amount of time.
$retry_after = array_select_keys(
$retry_after,
array_keys($pullable));
// Figure out which repositories we need to queue for an update.
foreach ($pullable as $id => $repository) {
$monogram = $repository->getMonogram();
if (isset($futures[$id])) {
$this->log(pht('Repository "%s" is currently updating.', $monogram));
continue;
}
if (isset($queue[$id])) {
$this->log(pht('Repository "%s" is already queued.', $monogram));
continue;
}
$after = idx($retry_after, $id, 0);
if ($after > time()) {
$this->log(
pht(
'Repository "%s" is not due for an update for %s second(s).',
$monogram,
new PhutilNumber($after - time())));
continue;
}
if (!$after) {
$this->log(
pht(
'Scheduling repository "%s" for an initial update.',
$monogram));
} else {
$this->log(
pht(
'Scheduling repository "%s" for an update (%s seconds overdue).',
$monogram,
new PhutilNumber(time() - $after)));
}
$queue[$id] = $after;
}
// Process repositories in the order they became candidates for updates.
asort($queue);
// Dequeue repositories until we hit maximum parallelism.
while ($queue && (count($futures) < $max_futures)) {
foreach ($queue as $id => $time) {
$repository = idx($pullable, $id);
if (!$repository) {
$this->log(
pht('Repository %s is no longer pullable; skipping.', $id));
unset($queue[$id]);
continue;
}
$monogram = $repository->getMonogram();
$this->log(pht('Starting update for repository "%s".', $monogram));
unset($queue[$id]);
$futures[$id] = $this->buildUpdateFuture(
$repository,
$no_discovery);
break;
}
}
if ($queue) {
$this->log(
pht(
'Not enough process slots to schedule the other %s '.
'repository(s) for updates yet.',
new PhutilNumber(count($queue))));
}
if ($futures) {
$iterator = id(new FutureIterator($futures))
->setUpdateInterval($min_sleep);
foreach ($iterator as $id => $future) {
$this->stillWorking();
if ($future === null) {
$this->log(pht('Waiting for updates to complete...'));
$this->stillWorking();
if ($this->loadRepositoryUpdateMessages()) {
$this->log(pht('Interrupted by pending updates!'));
break;
}
continue;
}
unset($futures[$id]);
$retry_after[$id] = $this->resolveUpdateFuture(
$pullable[$id],
$future,
$min_sleep);
// We have a free slot now, so go try to fill it.
break;
}
// Jump back into prioritization if we had any futures to deal with.
continue;
}
$this->waitForUpdates($min_sleep, $retry_after);
}
}
/**
* @task pull
*/
private function buildUpdateFuture(
PhabricatorRepository $repository,
$no_discovery) {
$bin = dirname(phutil_get_library_root('phabricator')).'/bin/repository';
$flags = array();
if ($no_discovery) {
$flags[] = '--no-discovery';
}
$callsign = $repository->getCallsign();
$future = new ExecFuture('%s update %Ls -- %s', $bin, $flags, $callsign);
// Sometimes, the underlying VCS commands will hang indefinitely. We've
// observed this occasionally with GitHub, and other users have observed
// it with other VCS servers.
// To limit the damage this can cause, kill the update out after a
// reasonable amount of time, under the assumption that it has hung.
// Since it's hard to know what a "reasonable" amount of time is given that
// users may be downloading a repository full of pirated movies over a
// potato, these limits are fairly generous. Repositories exceeding these
// limits can be manually pulled with `bin/repository update X`, which can
// just run for as long as it wants.
if ($repository->isImporting()) {
$timeout = phutil_units('4 hours in seconds');
} else {
$timeout = phutil_units('15 minutes in seconds');
}
$future->setTimeout($timeout);
return $future;
}
/**
* Check for repositories that should be updated immediately.
*
* With the `$consume` flag, an internal cursor will also be incremented so
* that these messages are not returned by subsequent calls.
*
* @param bool Pass `true` to consume these messages, so the process will
* not see them again.
* @return list<wild> Pending update messages.
*
* @task pull
*/
private function loadRepositoryUpdateMessages($consume = false) {
$type_need_update = PhabricatorRepositoryStatusMessage::TYPE_NEEDS_UPDATE;
$messages = id(new PhabricatorRepositoryStatusMessage())->loadAllWhere(
'statusType = %s AND id > %d',
$type_need_update,
$this->statusMessageCursor);
// Keep track of messages we've seen so that we don't load them again.
// If we reload messages, we can get stuck a loop if we have a failing
// repository: we update immediately in response to the message, but do
// not clear the message because the update does not succeed. We then
// immediately retry. Instead, messages are only permitted to trigger
// an immediate update once.
if ($consume) {
foreach ($messages as $message) {
$this->statusMessageCursor = max(
$this->statusMessageCursor,
$message->getID());
}
}
return $messages;
}
/**
* @task pull
*/
private function loadPullableRepositories(array $include, array $exclude) {
$query = id(new PhabricatorRepositoryQuery())
->setViewer($this->getViewer());
if ($include) {
$query->withCallsigns($include);
}
$repositories = $query->execute();
if ($include) {
$by_callsign = mpull($repositories, null, 'getCallsign');
foreach ($include as $name) {
if (empty($by_callsign[$name])) {
throw new Exception(
pht(
"No repository exists with callsign '%s'!",
$name));
}
}
}
if ($exclude) {
$exclude = array_fuse($exclude);
foreach ($repositories as $key => $repository) {
if (isset($exclude[$repository->getCallsign()])) {
unset($repositories[$key]);
}
}
}
foreach ($repositories as $key => $repository) {
if (!$repository->isTracked()) {
unset($repositories[$key]);
}
}
// Shuffle the repositories, then re-key the array since shuffle()
// discards keys. This is mostly for startup, we'll use soft priorities
// later.
shuffle($repositories);
$repositories = mpull($repositories, null, 'getID');
return $repositories;
}
/**
* @task pull
*/
private function resolveUpdateFuture(
PhabricatorRepository $repository,
ExecFuture $future,
$min_sleep) {
$monogram = $repository->getMonogram();
$this->log(pht('Resolving update for "%s".', $monogram));
try {
list($stdout, $stderr) = $future->resolvex();
} catch (Exception $ex) {
$proxy = new PhutilProxyException(
pht(
'Error while updating the "%s" repository.',
$repository->getMonogram()),
$ex);
phlog($proxy);
return time() + $min_sleep;
}
if (strlen($stderr)) {
$stderr_msg = pht(
'Unexpected output while updating repository "%s": %s',
$monogram,
$stderr);
phlog($stderr_msg);
}
$smart_wait = $repository->loadUpdateInterval($min_sleep);
$this->log(
pht(
'Based on activity in repository "%s", considering a wait of %s '.
'seconds before update.',
$repository->getMonogram(),
new PhutilNumber($smart_wait)));
return time() + $smart_wait;
}
/**
* Sleep for a short period of time, waiting for update messages from the
*
*
* @task pull
*/
private function waitForUpdates($min_sleep, array $retry_after) {
$this->log(
pht('No repositories need updates right now, sleeping...'));
$sleep_until = time() + $min_sleep;
if ($retry_after) {
$sleep_until = min($sleep_until, min($retry_after));
}
while (($sleep_until - time()) > 0) {
$sleep_duration = ($sleep_until - time());
$this->log(
pht(
'Sleeping for %s more second(s)...',
new PhutilNumber($sleep_duration)));
$this->sleep(1);
if ($this->shouldExit()) {
$this->log(pht('Awakened from sleep by graceful shutdown!'));
return;
}
if ($this->loadRepositoryUpdateMessages()) {
$this->log(pht('Awakened from sleep by pending updates!'));
break;
}
}
}
}

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