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PhabricatorSQLPatchList.php
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Fri, Apr 25, 22:58

PhabricatorSQLPatchList.php
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<?php
/*
* Copyright 2012 Facebook, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
abstract class PhabricatorSQLPatchList {
abstract function getNamespace();
abstract function getPatches();
final public static function buildAllPatches() {
$patch_lists = id(new PhutilSymbolLoader())
->setAncestorClass('PhabricatorSQLPatchList')
->setConcreteOnly(true)
->selectAndLoadSymbols();
$specs = array();
$seen_namespaces = array();
foreach ($patch_lists as $patch_class) {
$patch_class = $patch_class['name'];
$patch_list = newv($patch_class, array());
$namespace = $patch_list->getNamespace();
if (isset($seen_namespaces[$namespace])) {
$prior = $seen_namespaces[$namespace];
throw new Exception(
"PatchList '{$patch_class}' has the same namespace, '{$namespace}', ".
"as another patch list class, '{$prior}'. Each patch list MUST have ".
"a unique namespace.");
}
$last_key = null;
foreach ($patch_list->getPatches() as $key => $patch) {
if (!is_array($patch)) {
throw new Exception(
"PatchList '{$patch_class}' has a patch '{$key}' which is not ".
"an array.");
}
$valid = array(
'type' => true,
'name' => true,
'after' => true,
'legacy' => true,
);
foreach ($patch as $pkey => $pval) {
if (empty($valid[$pkey])) {
throw new Exception(
"PatchList '{$patch_class}' has a patch, '{$key}', with an ".
"unknown property, '{$pkey}'. Patches must have only valid ".
"keys: ".implode(', ', array_keys($valid)).'.');
}
}
if (is_numeric($key)) {
throw new Exception(
"PatchList '{$patch_class}' has a patch with a numeric key, ".
"'{$key}'. Patches must use string keys.");
}
if (strpos($key, ':') !== false) {
throw new Exception(
"PatchList '{$patch_class}' has a patch with a colon in the ".
"key name, '{$key}'. Patch keys may not contain colons.");
}
$full_key = "{$namespace}:{$key}";
if (isset($specs[$full_key])) {
throw new Exception(
"PatchList '{$patch_class}' has a patch '{$key}' which ".
"duplicates an existing patch key.");
}
$patch['key'] = $key;
$patch['fullKey'] = $full_key;
if (isset($patch['legacy'])) {
if ($namespace != 'phabricator') {
throw new Exception(
"Only patches in the 'phabricator' namespace may contain ".
"'legacy' keys.");
}
} else {
$patch['legacy'] = false;
}
if (!array_key_exists('after', $patch)) {
if ($last_key === null) {
throw new Exception(
"Patch '{$full_key}' is missing key 'after', and is the first ".
"patch in the patch list '{$patch_class}', so its application ".
"order can not be determined implicitly. The first patch in a ".
"patch list must list the patch or patches it depends on ".
"explicitly.");
} else {
$patch['after'] = array($last_key);
}
}
$last_key = $full_key;
foreach ($patch['after'] as $after_key => $after) {
if (strpos($after, ':') === false) {
$patch['after'][$after_key] = $namespace.':'.$after;
}
}
$type = idx($patch, 'type');
if (!$type) {
throw new Exception(
"Patch '{$namespace}:{$key}' is missing key 'type'. Every patch ".
"must have a type.");
}
switch ($type) {
case 'db':
case 'sql':
case 'php':
break;
default:
throw new Exception(
"Patch '{$namespace}:{$key}' has unknown patch type '{$type}'.");
}
$specs[$full_key] = $patch;
}
}
foreach ($specs as $key => $patch) {
foreach ($patch['after'] as $after) {
if (empty($specs[$after])) {
throw new Exception(
"Patch '{$key}' references nonexistent dependency, '{$after}'. ".
"Patches may only depend on patches which actually exist.");
}
}
}
$patches = array();
foreach ($specs as $full_key => $spec) {
$patches[$full_key] = new PhabricatorStoragePatch($spec);
}
// TODO: Detect cycles?
return $patches;
}
}

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