Add cycle detection to celerity mapper

Summary: create CelerityResourceGraph, which extends AbstractDirectedGraph.
since we've done a bunch of work already to load the resource graph into memory
CelerityResourceGraph simply stores a copy and makes loadEdges work off that
stored copy.

Test Plan:
made phabricator-prefab require herald-rule-editor

~/code/phabricator> ./scripts/celerity_mapper.php webroot
Finding static resources...
Processing 154
files..........................................................................................................................................................
[2011-11-22 11:28:29] EXCEPTION: (Exception) Cycle detected in resource graph:
phabricator-prefab => herald-rule-editor => phabricator-prefab at
[/Users/btrahan/Dropbox/code/phabricator/scripts/celerity_mapper.php:173]

fixed phabricator-prefab requiring herald-rule-editor.  re-ran celerity_mapper
and no errors!

Reviewers: epriestley

Reviewed By: epriestley

CC: aran, btrahan, epriestley

Differential Revision: 1132

Author: bobtrahan

scripts/celerity_mapper.php

@@ -130,7 +130,7 @@
 echo "\n";
 
 $runtime_map = array();
-
+$resource_graph = array();
 $hash_map = array();
 
 $parser = new PhutilDocblockParser();
@@ -168,6 +168,8 @@
 
   $hash_map[$provides] = $info['hash'];
 
+  $resource_graph[$provides] = $requires;
+
   $runtime_map[$provides] = array(
     'uri'       => $uri,
     'type'      => $type,
@@ -176,6 +178,20 @@
   );
 }
 
+$celerity_resource_graph = new CelerityResourceGraph();
+$celerity_resource_graph->addNodes($resource_graph);
+$celerity_resource_graph->setResourceGraph($resource_graph);
+$celerity_resource_graph->loadGraph();
+
+foreach ($resource_graph as $provides => $requires) {
+  $cycle = $celerity_resource_graph->detectCycles($provides);
+  if ($cycle) {
+    throw new Exception(
+      "Cycle detected in resource graph: ". implode($cycle, " => ")
+    );
+  }
+}
+
 $package_map = array();
 foreach ($package_spec as $name => $package) {
   $hashes = array();

src/__phutil_library_map__.php

@@ -83,6 +83,7 @@
     'AphrontWriteGuard' => 'aphront/writeguard',
     'CelerityAPI' => 'infrastructure/celerity/api',
     'CelerityResourceController' => 'infrastructure/celerity/controller',
+    'CelerityResourceGraph' => 'infrastructure/celerity/graph',
     'CelerityResourceMap' => 'infrastructure/celerity/map',
     'CelerityStaticResourceResponse' => 'infrastructure/celerity/response',
     'ConduitAPIMethod' => 'applications/conduit/method/base',
@@ -813,6 +814,7 @@
     'AphrontTypeaheadTemplateView' => 'AphrontView',
     'AphrontWebpageResponse' => 'AphrontResponse',
     'CelerityResourceController' => 'AphrontController',
+    'CelerityResourceGraph' => 'AbstractDirectedGraph',
     'ConduitAPI_arcanist_Method' => 'ConduitAPIMethod',
     'ConduitAPI_arcanist_projectinfo_Method' => 'ConduitAPI_arcanist_Method',
     'ConduitAPI_conduit_connect_Method' => 'ConduitAPIMethod',

src/infrastructure/celerity/graph/CelerityResourceGraph.php

@@ -0,0 +1,47 @@
+<?php
+
+/*
+ * Copyright 2011 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.
+ */
+
+final class CelerityResourceGraph extends AbstractDirectedGraph {
+
+  private $resourceGraph = array();
+  private $graphSet = false;
+
+  protected function loadEdges(array $nodes) {
+    if (!$this->graphSet) {
+      throw new Exception(
+        "Call setResourceGraph before loading the graph!"
+      );
+    }
+
+    $graph = $this->getResourceGraph();
+    $edges = array();
+    foreach ($nodes as $node) {
+      $edges[$node] = idx($graph, $node, array());
+    }
+    return $edges;
+  }
+
+  final public function setResourceGraph(array $graph) {
+    $this->resourceGraph = $graph;
+    $this->graphSet = true;
+  }
+
+  private function getResourceGraph() {
+    return $this->resourceGraph;
+  }
+}

src/infrastructure/celerity/graph/__init__.php

@@ -0,0 +1,13 @@
+<?php
+/**
+ * This file is automatically generated. Lint this module to rebuild it.
+ * @generated
+ */
+
+
+
+phutil_require_module('phutil', 'utils');
+phutil_require_module('phutil', 'utils/abstractgraph');
+
+
+phutil_require_source('CelerityResourceGraph.php');