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PhabricatorDifferentialMigrateHunkWorkflow.php
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Wed, Apr 23, 19:41

PhabricatorDifferentialMigrateHunkWorkflow.php
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<?php
final class PhabricatorDifferentialMigrateHunkWorkflow
extends PhabricatorDifferentialManagementWorkflow {
protected function didConstruct() {
$this
->setName('migrate-hunk')
->setExamples(
"**migrate-hunk** --id __hunk__ --to __storage__\n".
"**migrate-hunk** --all")
->setSynopsis(pht('Migrate storage engines for a hunk.'))
->setArguments(
array(
array(
'name' => 'id',
'param' => 'id',
'help' => pht('Hunk ID to migrate.'),
),
array(
'name' => 'to',
'param' => 'storage',
'help' => pht('Storage engine to migrate to.'),
),
array(
'name' => 'all',
'help' => pht('Migrate all hunks.'),
),
array(
'name' => 'auto',
'help' => pht('Select storage format automatically.'),
),
array(
'name' => 'dry-run',
'help' => pht('Show planned writes but do not perform them.'),
),
));
}
public function execute(PhutilArgumentParser $args) {
$is_dry_run = $args->getArg('dry-run');
$id = $args->getArg('id');
$is_all = $args->getArg('all');
if ($is_all && $id) {
throw new PhutilArgumentUsageException(
pht(
'Options "--all" (to migrate all hunks) and "--id" (to migrate a '.
'specific hunk) are mutually exclusive.'));
} else if (!$is_all && !$id) {
throw new PhutilArgumentUsageException(
pht(
'Specify a hunk to migrate with "--id", or migrate all hunks '.
'with "--all".'));
}
$is_auto = $args->getArg('auto');
$storage = $args->getArg('to');
if ($is_auto && $storage) {
throw new PhutilArgumentUsageException(
pht(
'Options "--to" (to choose a specific storage format) and "--auto" '.
'(to select a storage format automatically) are mutually '.
'exclusive.'));
} else if (!$is_auto && !$storage) {
throw new PhutilArgumentUsageException(
pht(
'Use "--to" to choose a storage format, or "--auto" to select a '.
'format automatically.'));
}
$types = array(
DifferentialHunk::DATATYPE_TEXT,
DifferentialHunk::DATATYPE_FILE,
);
$types = array_fuse($types);
if (strlen($storage)) {
if (!isset($types[$storage])) {
throw new PhutilArgumentUsageException(
pht(
'Storage type "%s" is unknown. Supported types are: %s.',
$storage,
implode(', ', array_keys($types))));
}
}
if ($id) {
$hunk = $this->loadHunk($id);
$hunks = array($hunk);
} else {
$hunks = new LiskMigrationIterator(new DifferentialHunk());
}
foreach ($hunks as $hunk) {
try {
$this->migrateHunk($hunk, $storage, $is_auto, $is_dry_run);
} catch (Exception $ex) {
// If we're migrating a single hunk, just throw the exception. If
// we're migrating multiple hunks, warn but continue.
if ($id) {
throw $ex;
}
$this->logWarn(
pht('WARN'),
pht(
'Failed to migrate hunk %d: %s',
$hunk->getID(),
$ex->getMessage()));
}
}
return 0;
}
private function loadHunk($id) {
$hunk = id(new DifferentialHunk())->load($id);
if (!$hunk) {
throw new PhutilArgumentUsageException(
pht(
'No hunk exists with ID "%s".',
$id));
}
return $hunk;
}
private function migrateHunk(
DifferentialHunk $hunk,
$type,
$is_auto,
$is_dry_run) {
$old_type = $hunk->getDataType();
if ($is_auto) {
// By default, we're just going to keep hunks in the same storage
// engine. In the future, we could perhaps select large hunks stored in
// text engine and move them into file storage.
$new_type = $old_type;
} else {
$new_type = $type;
}
// Figure out if the storage format (e.g., plain text vs compressed)
// would change if we wrote this hunk anew today.
$old_format = $hunk->getDataFormat();
$new_format = $hunk->getAutomaticDataFormat();
$same_type = ($old_type === $new_type);
$same_format = ($old_format === $new_format);
// If we aren't going to change the storage engine and aren't going to
// change the storage format, just bail out.
if ($same_type && $same_format) {
$this->logInfo(
pht('SKIP'),
pht(
'Hunk %d is already stored in the preferred engine ("%s") '.
'with the preferred format ("%s").',
$hunk->getID(),
$new_type,
$new_format));
return;
}
if ($is_dry_run) {
$this->logOkay(
pht('DRY RUN'),
pht(
'Hunk %d would be rewritten (storage: "%s" -> "%s"; '.
'format: "%s" -> "%s").',
$hunk->getID(),
$old_type,
$new_type,
$old_format,
$new_format));
return;
}
$old_data = $hunk->getChanges();
switch ($new_type) {
case DifferentialHunk::DATATYPE_TEXT:
$hunk->saveAsText();
break;
case DifferentialHunk::DATATYPE_FILE:
$hunk->saveAsFile();
break;
}
$this->logOkay(
pht('MIGRATE'),
pht(
'Converted hunk %d to "%s" storage (with format "%s").',
$hunk->getID(),
$new_type,
$hunk->getDataFormat()));
$hunk = $this->loadHunk($hunk->getID());
$new_data = $hunk->getChanges();
if ($old_data !== $new_data) {
throw new Exception(
pht(
'Integrity check failed: new file data differs from old data!'));
}
}
}

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