Merge branch 'master' into promises

master/bt5/vifib_base/DocumentTemplateItem/SoftwareInstance.py

@@ -29,6 +29,13 @@ from AccessControl import ClassSecurityInfo
 from Products.ERP5Type import Permissions
 from Products.ERP5.Document.Item import Item
 from lxml import etree
+import collections
+
+class DisconnectedSoftwareTree(Exception):
+  pass
+
+class CyclicSoftwareTree(Exception):
+  pass
 
 class SoftwareInstance(Item):
   """
@@ -60,3 +67,44 @@ class SoftwareInstance(Item):
           value = element.text
         result_dict[key] = value
     return result_dict
+
+  security.declareProtected(Permissions.AccessContentsInformation,
+    'checkNotCyclic')
+  def checkNotCyclic(self, graph):
+    # see http://neopythonic.blogspot.com/2009/01/detecting-cycles-in-directed-graph.html
+    todo = set(graph.keys())
+    while todo:
+      node = todo.pop()
+      stack = [node]
+      while stack:
+        top = stack[-1]
+        for node in graph[top]:
+          if node in stack:
+            raise CyclicSoftwareTree
+          if node in todo:
+            stack.append(node)
+            todo.remove(node)
+            break
+        else:
+          node = stack.pop()
+    return True
+
+  security.declareProtected(Permissions.AccessContentsInformation,
+    'checkConnected')
+  def checkConnected(self, graph, root):
+    size = len(graph)
+    visited = set()
+    to_crawl = collections.deque(graph[root])
+    while to_crawl:
+      current = to_crawl.popleft()
+      if current in visited:
+        continue
+      visited.add(current)
+      node_children = set(graph[current])
+      to_crawl.extend(node_children - visited)
+    # add one to visited, as root won't be visited, only children
+    # this is false positive in case of cyclic graphs, but they are
+    # anyway wrong in Software Instance trees
+    if size != len(visited) + 1:
+      raise DisconnectedSoftwareTree
+    return True

master/bt5/vifib_base/WorkflowTemplateItem/portal_workflow/software_instance_slap_interface_workflow/scripts/SoftwareInstance_requestSoftwareInstance.xml

@@ -64,9 +64,12 @@ instance_xml = kwargs["instance_xml"]\n
 sla_xml = kwargs["sla_xml"]\n
 state = kwargs["state"]\n
 \n
-# Get root software instance\n
+# graph allows to "simulate" tree change after requested operation\n
+graph = {}\n
+# Get root software instance and create initial graph\n
 predecessor_software_instance = software_instance\n
 while (predecessor_software_instance is not None):\n
+  graph[predecessor_software_instance.getUid()] = predecessor_software_instance.getPredecessorUidList()\n
   root_software_instance = predecessor_software_instance\n
   predecessor_software_instance = predecessor_software_instance.getPredecessorRelatedValue(\n
       portal_type="Software Instance")\n
@@ -84,6 +87,11 @@ request_software_instance = software_instance.portal_catalog.getResultValue(\n
   root_uid=root_software_instance.getUid(),\n
 )\n
 \n
+# above query does not find root software instance, but as this case is easy\n
+# to find, just check if such request does not come and raise\n
+if root_software_instance.getTitle() == requested_partition_reference:\n
+  raise ValueError(\'It is disallowed to request root software instance\')\n
+\n
 if (request_software_instance is None):\n
   if (portal.portal_activities.countMessageWithTag(tag) > 0):\n
     # The software instance is already under creation but can not be fetched from catalog\n
@@ -130,6 +138,8 @@ else:\n
     predecessor_software_instance.edit(\n
       predecessor_uid_list=predecessor_uid_list,\n
       activate_kw={\'tag\': tag},)\n
+    graph[predecessor_software_instance.getUid()] = predecessor_uid_list\n
+\n
   if state == \'started\':\n
     request_software_instance.startRequested()\n
     request_software_instance.activate(after_tag=tag).requestStartComputerPartition()\n
@@ -139,7 +149,16 @@ else:\n
   else:\n
     raise ValueError(\'State %r is not supported\' % state)\n
 predecessor_list = software_instance.getPredecessorList() + [request_software_instance.getRelativeUrl()]\n
+# Add requested software instance to graph if does not exists there yet\n
+if not request_software_instance.getUid() in graph:\n
+  graph[request_software_instance.getUid()] = []\n
+\n
+# update graph to reflect requested operation\n
+graph[software_instance.getUid()] = software_instance.getPredecessorUidList() + [request_software_instance.getUid()]\n
 \n
+# check if all elements are still connected\n
+software_instance.checkNotCyclic(graph)\n
+software_instance.checkConnected(graph, root_software_instance.getUid())\n
 \n
 software_instance.edit(\n
   predecessor_list=predecessor_list,\n

master/bt5/vifib_base/bt/revision

-246
\ No newline at end of file
+252
\ No newline at end of file