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DiffusionBlameQuery.php
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Sun, Jul 14, 17:26

DiffusionBlameQuery.php
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<?php
abstract class DiffusionBlameQuery extends DiffusionQuery {
private $timeout;
private $paths;
public function setTimeout($timeout) {
$this->timeout = $timeout;
return $this;
}
public function getTimeout() {
return $this->timeout;
}
public function setPaths(array $paths) {
$this->paths = $paths;
return $this;
}
public function getPaths() {
return $this->paths;
}
abstract protected function newBlameFuture(DiffusionRequest $request, $path);
abstract protected function resolveBlameFuture(ExecFuture $future);
final public static function newFromDiffusionRequest(
DiffusionRequest $request) {
return parent::newQueryObject(__CLASS__, $request);
}
final protected function executeQuery() {
$paths = $this->getPaths();
$blame = array();
// Load cache keys: these are the commits at which each path was last
// touched.
$keys = $this->loadCacheKeys($paths);
// Try to read blame data from cache.
$cache = $this->readCacheData($keys);
foreach ($paths as $key => $path) {
if (!isset($cache[$path])) {
continue;
}
$blame[$path] = $cache[$path];
unset($paths[$key]);
}
// If we have no paths left, we filled everything from cache and can
// bail out early.
if (!$paths) {
return $blame;
}
$request = $this->getRequest();
$timeout = $this->getTimeout();
// We're still missing at least some data, so we need to run VCS commands
// to pull it.
$futures = array();
foreach ($paths as $path) {
$future = $this->newBlameFuture($request, $path);
if ($timeout) {
$future->setTimeout($timeout);
}
$futures[$path] = $future;
}
$futures = id(new FutureIterator($futures))
->limit(4);
foreach ($futures as $path => $future) {
$path_blame = $this->resolveBlameFuture($future);
if ($path_blame !== null) {
$blame[$path] = $path_blame;
}
}
// Fill the cache with anything we generated.
$this->writeCacheData(
array_select_keys($keys, $paths),
$blame);
return $blame;
}
private function loadCacheKeys(array $paths) {
$request = $this->getRequest();
$viewer = $request->getUser();
$repository = $request->getRepository();
$repository_id = $repository->getID();
$last_modified = parent::callConduitWithDiffusionRequest(
$viewer,
$request,
'diffusion.lastmodifiedquery',
array(
'paths' => array_fill_keys($paths, $request->getCommit()),
));
$map = array();
foreach ($paths as $path) {
$identifier = idx($last_modified, $path);
if ($identifier === null) {
continue;
}
$path_hash = PhabricatorHash::digestForIndex($path);
$map[$path] = "blame({$repository_id}, {$identifier}, {$path_hash}, raw)";
}
return $map;
}
private function readCacheData(array $keys) {
$cache = PhabricatorCaches::getImmutableCache();
$data = $cache->getKeys($keys);
$results = array();
foreach ($keys as $path => $key) {
if (!isset($data[$key])) {
continue;
}
$results[$path] = $data[$key];
}
// Decode the cache storage format.
foreach ($results as $path => $cache) {
list($head, $body) = explode("\n", $cache, 2);
switch ($head) {
case 'raw':
$body = explode("\n", $body);
break;
default:
$body = null;
break;
}
if ($body === null) {
unset($results[$path]);
} else {
$results[$path] = $body;
}
}
return $results;
}
private function writeCacheData(array $keys, array $blame) {
$writes = array();
foreach ($keys as $path => $key) {
$value = idx($blame, $path);
if ($value === null) {
continue;
}
// For now, just store the entire value with a "raw" header. In the
// future, we could compress this or use IDs instead.
$value = "raw\n".implode("\n", $value);
$writes[$key] = $value;
}
if (!$writes) {
return;
}
$cache = PhabricatorCaches::getImmutableCache();
$data = $cache->setKeys($writes, phutil_units('14 days in seconds'));
}
}

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