feat/bt-py3 branch (MR 1979): BusinessTemplate,XMLExportImport: support python3

With these changes, we are able to install py2 business templates on py3,
but export is slightly different, because we already export using pickle
protocol 3 on py3.

To be able to install py2 business templates, we included heuristics to
guess the str or bytes from business template XML: oids are bytes and
also some strings that do not decode to UTF-8, so that we can install
python2 business templates on py3.

When exporting business templates, we need to build a list of referenced
persistent objects to export them separately in the XML, this is is done
using Unpickler.noload, in a way which does not support pickle protocol
1 on py3 (the persistent ids are None and the assertion in
https://github.com/zopefoundation/ZODB/blob/d698507bb89eeb38c6e655199bc9f54c909dbf4d/src/ZODB/serialize.py#L669
fails), so we need to use pickle protocol 3 on py3.

In the future, we might switch to exporting on protocol 3 on py2 as well
so that we have stable output on both py2 and py3, or maybe we'll do
this only when we stop supporting py2.

product/ERP5/Document/BusinessTemplate.py

@@ -29,7 +29,7 @@
 
 import six
 from six import string_types as basestring
-from Products.ERP5Type.Utils import ensure_list, bytes2str
+from Products.ERP5Type.Utils import ensure_list, bytes2str, str2bytes
 import fnmatch, gc, glob, imp, os, re, shutil, sys, time, tarfile
 from collections import defaultdict
 from Shared.DC.ZRDB import Aqueduct
@@ -79,6 +79,7 @@ from OFS import SimpleItem
 from OFS.Image import Pdata
 import coverage
 from io import BytesIO
+from six.moves import StringIO
 from copy import deepcopy
 from zExceptions import BadRequest
 from Products.ERP5Type.XMLExportImport import exportXML, customImporters
@@ -94,6 +95,10 @@ from importlib import import_module
 import posixpath
 import transaction
 import inspect
+if six.PY2:
+  BufferedReader = file
+else:
+  from io import BufferedReader
 
 import threading
 from ZODB.broken import Broken, BrokenModified
@@ -344,13 +349,17 @@ class BusinessTemplateArchive(object):
     try:
       write = self._writeFile
     except AttributeError:
-      if not isinstance(obj, str):
+      if hasattr(obj, 'read'):
         obj.seek(0)
         obj = obj.read()
+      if not isinstance(obj, bytes):
+        obj = obj.encode('utf-8')
       self.revision.hash(path, obj)
       self._writeString(obj, path)
     else:
       if isinstance(obj, str):
+        obj = str2bytes(obj)
+      if isinstance(obj, bytes):
         self.revision.hash(path, obj)
         obj = BytesIO(obj)
       else:
@@ -372,11 +381,8 @@ class BusinessTemplateFolder(BusinessTemplateArchive):
     object_path = os.path.join(self.path, path)
     path = os.path.dirname(object_path)
     os.path.exists(path) or os.makedirs(path)
-    f = open(object_path, 'wb')
-    try:
+    with open(object_path, 'wb') as f:
       f.write(obj)
-    finally:
-      f.close()
 
   def importFiles(self, item):
     """
@@ -789,7 +795,10 @@ class ObjectTemplateItem(BaseTemplateItem):
         return mime.extensions[0]
       for ext in mime.globs:
         if ext[0] == "*" and ext.count(".") == 1:
-          return ext[2:].encode("utf-8")
+          ext = ext[2:]
+          if six.PY2:
+            return ext.encode("utf-8")
+          return ext
 
     # in case we could not read binary flag from mimetypes_registry then return
     # '.bin' for all the Portal Types where exported_property_type is data
@@ -833,8 +842,11 @@ class ObjectTemplateItem(BaseTemplateItem):
               except (AttributeError, UnicodeEncodeError):
                 break
             elif type(data) is not bytes:
-              if not isinstance(data, Pdata):
+              if isinstance(data, str):
+                data = data.encode()
+              elif not isinstance(data, Pdata):
                 break
+              else:
                 data = bytes(data)
             try:
               # Delete this attribute from the object.
@@ -861,9 +873,9 @@ class ObjectTemplateItem(BaseTemplateItem):
           obj = self.removeProperties(obj, 1, keep_workflow_history = True)
           transaction.savepoint(optimistic=True)
 
-        f = BytesIO()
+        f = StringIO()
         exportXML(obj._p_jar, obj._p_oid, f)
-        bta.addObject(f, key, path=path)
+        bta.addObject(str2bytes(f.getvalue()), key, path=path)
 
       if catalog_method_template_item:
         # add all datas specific to catalog inside one file
@@ -917,7 +929,7 @@ class ObjectTemplateItem(BaseTemplateItem):
     else:
       connection = self.getConnection(self.aq_parent)
       __traceback_info__ = 'Importing %s' % file_name
-      if hasattr(cache_database, 'db') and isinstance(file_obj, file):
+      if hasattr(cache_database, 'db') and isinstance(file_obj, BufferedReader):
         obj = connection.importFile(self._compileXML(file_obj))
       else:
         # FIXME: Why not use the importXML function directly? Are there any BT5s
@@ -1079,8 +1091,8 @@ class ObjectTemplateItem(BaseTemplateItem):
     for path, old_object in upgrade_list:
       # compare object to see it there is changes
       new_object = self._objects[path]
-      new_io = BytesIO()
-      old_io = BytesIO()
+      new_io = StringIO()
+      old_io = StringIO()
       exportXML(new_object._p_jar, new_object._p_oid, new_io)
       new_obj_xml = new_io.getvalue()
       try:
@@ -1516,6 +1528,12 @@ class ObjectTemplateItem(BaseTemplateItem):
           container.getParentValue().updateCache()
         elif obj.__class__.__name__ in ('File', 'Image'):
           if "data" in obj.__dict__:
+            # XXX when installing very old business templates without the data stored
+            # in a separate file (such as the one from
+            # testTemplateTool.TestTemplateTool.test_updateBusinessTemplateFromUrl_keep_list)
+            # data might be loaded as a string, fix this here.
+            if obj.data is not None and not isinstance(obj.data, (bytes, Pdata)):
+              obj.data = obj.data.encode()
             # XXX Calling obj._setData() would call Interaction Workflow such
             # as document_conversion_interaction_workflow which would update
             # mime_type too...
@@ -3504,14 +3522,14 @@ class PortalTypeRolesTemplateItem(BaseTemplateItem):
         prop_value = role.get(property)
         if prop_value:
           if isinstance(prop_value, str):
-            prop_value = escape(prop_value.decode('utf-8'))
+            prop_value = escape(prop_value)
           xml_data += "\n   <property id='%s'>%s</property>" % \
               (property, prop_value)
       # multi
       for property in ('categories', 'category', 'base_category'):
         for prop_value in role.get(property, []):
           if isinstance(prop_value, str):
-            prop_value = escape(prop_value.decode('utf-8'))
+            prop_value = escape(prop_value)
           xml_data += "\n   <multi_property "\
           "id='%s'>%s</multi_property>" % (property, prop_value)
       xml_data += "\n  </role>"
@@ -3524,7 +3542,7 @@ class PortalTypeRolesTemplateItem(BaseTemplateItem):
     path = self.__class__.__name__
     for key in self._objects:
       xml_data = self.generateXml(key)
-      if isinstance(xml_data, six.text_type):
+      if six.PY2 and isinstance(xml_data, six.text_type):
         xml_data = xml_data.encode('utf-8')
       name = key.split('/', 1)[1]
       bta.addObject(xml_data, name=name, path=path)
@@ -3538,7 +3556,7 @@ class PortalTypeRolesTemplateItem(BaseTemplateItem):
     xml_type_roles_list = xml.findall('role')
     for role in xml_type_roles_list:
       id = role.get('id')
-      if isinstance(id, six.text_type):
+      if six.PY2 and isinstance(id, six.text_type):
         id = id.encode('utf_8', 'backslashreplace')
       type_role_property_dict = {'id': id}
       # uniq
@@ -3547,7 +3565,7 @@ class PortalTypeRolesTemplateItem(BaseTemplateItem):
         property_id = property_node.get('id')
         if property_node.text:
           value = property_node.text
-          if isinstance(value, six.text_type):
+          if six.PY2 and isinstance(value, six.text_type):
             value = value.encode('utf_8', 'backslashreplace')
           type_role_property_dict[property_id] = value
       # multi
@@ -3556,7 +3574,7 @@ class PortalTypeRolesTemplateItem(BaseTemplateItem):
         property_id = property_node.get('id')
         if property_node.text:
           value = property_node.text
-          if isinstance(value, six.text_type):
+          if six.PY2 and isinstance(value, six.text_type):
             value = value.encode('utf_8', 'backslashreplace')
           type_role_property_dict.setdefault(property_id, []).append(value)
       type_roles_list.append(type_role_property_dict)
@@ -3964,7 +3982,7 @@ class FilesystemDocumentTemplateItem(BaseTemplateItem):
     if not file_name.endswith('.py'):
       LOG('Business Template', 0, 'Skipping file "%s"' % (file_name, ))
       return
-    text = file.read()
+    text = file.read().decode('utf-8')
     self._objects[file_name[:-3]] = text
 
 class FilesystemToZodbTemplateItem(FilesystemDocumentTemplateItem,
@@ -4965,7 +4983,7 @@ class LocalRolesTemplateItem(BaseTemplateItem):
       xml_data += '\n </local_role_group_ids>'
 
     xml_data += '\n</local_roles_item>'
-    if isinstance(xml_data, six.text_type):
+    if six.PY2 and isinstance(xml_data, six.text_type):
       xml_data = xml_data.encode('utf8')
     return xml_data
 
@@ -6096,8 +6114,8 @@ Business Template is a set of definitions, such as skins, portal types and categ
                      '_test_item', '_message_translation_item',]
 
       if item_name in item_list_1:
-        f1 = BytesIO() # for XML export of New Object
-        f2 = BytesIO() # For XML export of Installed Object
+        f1 = StringIO() # for XML export of New Object
+        f2 = StringIO() # For XML export of Installed Object
         # Remove unneeded properties
         new_object = new_item.removeProperties(new_object, 1)
         installed_object = installed_item.removeProperties(installed_object, 1)
@@ -6741,7 +6759,9 @@ Business Template is a set of definitions, such as skins, portal types and categ
 
       from base64 import b64encode
       def __newTempComponent(portal_type, reference, source_reference, migrate=False):
-        uid = b64encode("%s|%s|%s" % (portal_type, reference, source_reference))
+        uid = b64encode(("%s|%s|%s" % (portal_type, reference, source_reference)).encode())
+        if six.PY3:
+          uid = uid.decode()
         if migrate:
           bt_migratable_uid_list.append(uid)
 

product/ERP5/Tool/TemplateTool.py

@@ -66,7 +66,7 @@ from Products.ERP5Type.Message import translateString
 from zLOG import LOG, INFO, WARNING
 import subprocess
 import time
-from Products.ERP5Type.Utils import bytes2str
+from Products.ERP5Type.Utils import bytes2str, str2bytes, unicode2str
 import json
 
 WIN = os.name == 'nt'
@@ -345,7 +345,9 @@ class TemplateTool (BaseTool):
       try:
         os.close(tempid) # Close the opened fd as soon as possible.
         file_path, headers = urlretrieve(url, temppath)
-        if re.search(r'<title>.*Revision \d+:', open(file_path, 'r').read()):
+        with open(file_path, 'rb') as f:
+          content = f.read()
+        if re.search(br'<title>.*Revision \d+:', content):
           # this looks like a subversion repository, try to check it out
           LOG('ERP5', INFO, 'TemplateTool doing a svn checkout of %s' % url)
           return self._download_svn(url, bt_id)
@@ -712,7 +714,7 @@ class TemplateTool (BaseTool):
         Return a repository and an id.
       """
       repository, id = json.loads(b64decode(uid))
-      return repository.encode('utf-8'), id.encode('utf-8')
+      return unicode2str(repository), unicode2str(id)
 
     security.declarePublic( 'encodeRepositoryBusinessTemplateUid' )
     def encodeRepositoryBusinessTemplateUid(self, repository, id):
@@ -720,7 +722,7 @@ class TemplateTool (BaseTool):
         encode the repository and the id of a business template.
         Return an uid.
       """
-      return b64encode(json.dumps((repository, id)))
+      return b64encode(str2bytes(json.dumps((repository, id))))
 
     security.declarePublic('compareVersionStrings')
     def compareVersionStrings(self, version, comparing_string):
@@ -1066,7 +1068,7 @@ class TemplateTool (BaseTool):
                               installed_revision=installed_revision,
                               repository=repository,
                               **property_dict)
-        obj.setUid(uid)
+        obj.setUid(bytes2str(uid))
         result_list.append(obj)
       result_list.sort(key=lambda x: x.getTitle())
       return result_list
@@ -1113,7 +1115,7 @@ class TemplateTool (BaseTool):
             e = int(e)
           except ValueError:
             # ASCII code is one byte, so this produces negative.
-            e = struct.unpack('b', e)[0] - 0x200
+            e = struct.unpack('b', e.encode())[0] - 0x200
         except IndexError:
           e = 0
         return e

product/ERP5Type/XMLExportImport/__init__.py

@@ -40,19 +40,22 @@
 from Acquisition import aq_base, aq_inner
 from collections import OrderedDict
 from io import BytesIO
-from zodbpickle.pickle import Pickler
+from zodbpickle.slowpickle import Pickler
 from xml.sax.saxutils import escape, unescape
 from lxml import etree
 from lxml.etree import Element, SubElement
 from xml_marshaller.xml_marshaller import Marshaller
 from OFS.Image import Pdata
-from base64 import standard_b64encode
+import six
+if six.PY2:
+  from base64 import standard_b64encode, encodestring as encodebytes
+else:
+  from base64 import standard_b64encode, encodebytes
+
 from hashlib import sha1
-from Products.ERP5Type.Utils import ensure_list
+from Products.ERP5Type.Utils import bytes2str
 #from zLOG import LOG
 
-import six
-
 try:
   long_ = long
 except NameError: # six.PY3
@@ -62,6 +65,9 @@ MARSHALLER_NAMESPACE_URI = 'http://www.erp5.org/namespaces/marshaller'
 marshaller = Marshaller(namespace_uri=MARSHALLER_NAMESPACE_URI,
                                                             as_tree=True).dumps
 
+DEFAULT_PICKLE_PROTOCOL = 1 if six.PY2 else 3
+
+
 class OrderedPickler(Pickler):
     """Pickler producing consistent output by saving dicts in order
     """
@@ -204,8 +210,8 @@ def Base_asXML(object, root=None):
       local_group_node.append(marshaller(group_role[1]))
   if return_as_object:
     return root
-  return etree.tostring(root, encoding='utf-8',
-                        xml_declaration=True, pretty_print=True)
+  return bytes2str(etree.tostring(root, encoding='utf-8',
+                        xml_declaration=True, pretty_print=True))
 
 def Folder_asXML(object, omit_xml_declaration=True, root=None):
   """
@@ -226,24 +232,27 @@ def Folder_asXML(object, omit_xml_declaration=True, root=None):
     if issubclass(o.__class__, Base):
       o.asXML(root=root_node)
 
-  return etree.tostring(root, encoding='utf-8',
-                        xml_declaration=xml_declaration, pretty_print=True)
+  return bytes2str(etree.tostring(root, encoding='utf-8',
+                        xml_declaration=xml_declaration, pretty_print=True))
 
 ## The code below was initially from OFS.XMLExportImport
 from six import string_types as basestring
-from base64 import encodestring
 from ZODB.serialize import referencesf
 from ZODB.ExportImport import TemporaryFile, export_end_marker
 from ZODB.utils import p64
 from ZODB.utils import u64
 from functools import partial
-from inspect import getargspec
+if six.PY2:
+  from inspect import getargspec as getfullargspec
+else:
+  from inspect import getfullargspec
 from OFS import ObjectManager
 from . import ppml
 
 magic=b'<?xm' # importXML(jar, file, clue)}
 
-def reorderPickle(jar, p):
+
+def reorderPickle(jar, p, pickle_protocol):
     try:
         from ZODB._compat import Unpickler, Pickler
     except ImportError: # BBB: ZODB 3.10
@@ -278,37 +287,47 @@ def reorderPickle(jar, p):
     unpickler.persistent_load=persistent_load
 
     newp=BytesIO()
-    pickler=OrderedPickler(newp,1)
+    pickler = OrderedPickler(newp, pickle_protocol)
     pickler.persistent_id=persistent_id
 
     classdef = unpickler.load()
     obj = unpickler.load()
     pickler.dump(classdef)
     pickler.dump(obj)
+
+    if 0: # debug
+      debugp = BytesIO()
+      debugpickler = OrderedPickler(debugp, pickle_protocol)
+      debugpickler.persistent_id = persistent_id
+      debugpickler.dump(obj)
+      import pickletools
+      print(debugp.getvalue())
+      print(pickletools.dis(debugp.getvalue()))
+
     p=newp.getvalue()
     return obj, p
 
 def _mapOid(id_mapping, oid):
     idprefix = str(u64(oid))
     id = id_mapping[idprefix]
-    old_aka = encodestring(oid)[:-1]
-    aka=encodestring(p64(long_(id)))[:-1]  # Rebuild oid based on mapped id
+    old_aka = encodebytes(oid)[:-1]
+    aka=encodebytes(p64(long_(id)))[:-1]  # Rebuild oid based on mapped id
     id_mapping.setConvertedAka(old_aka, aka)
     return idprefix+'.', id, aka
 
 def XMLrecord(oid, plen, p, id_mapping):
     # Proceed as usual
-    q=ppml.ToXMLUnpickler
-    f=BytesIO(p)
-    u=q(f)
+    f = BytesIO(p)
+    u = ppml.ToXMLUnpickler(f)
     u.idprefix, id, aka = _mapOid(id_mapping, oid)
-    p=u.load(id_mapping=id_mapping).__str__(4)
+    p = u.load(id_mapping=id_mapping).__str__(4)
     if f.tell() < plen:
         p=p+u.load(id_mapping=id_mapping).__str__(4)
-    String='  <record id="%s" aka="%s">\n%s  </record>\n' % (id, aka, p)
+    String='  <record id="%s" aka="%s">\n%s  </record>\n' % (id, bytes2str(aka), p)
     return String
 
-def exportXML(jar, oid, file=None):
+
+def exportXML(jar, oid, file=None, pickle_protocol=DEFAULT_PICKLE_PROTOCOL):
     # For performance reasons, exportXML does not use 'XMLrecord' anymore to map
     # oids. This requires to initialize MinimalMapping.marked_reference before
     # any string output, i.e. in ppml.Reference.__init__
@@ -316,15 +335,15 @@ def exportXML(jar, oid, file=None):
     # can have values that have a shorter representation in 'repr' instead of
     # 'base64' (see ppml.convert) and ppml.String does not support this.
     load = jar._storage.load
-    if 'version' in getargspec(load).args: # BBB: ZODB<5 (TmpStore)
+    if 'version' in getfullargspec(load).args: # BBB: ZODB<5 (TmpStore)
         load = partial(load, version='')
     pickle_dict = {oid: None}
     max_cache = [1e7] # do not cache more than 10MB of pickle data
     def getReorderedPickle(oid):
-        p = pickle_dict[oid]
+        p = pickle_dict.get(oid)
         if p is None:
             p = load(oid)[0]
-            p = reorderPickle(jar, p)[1]
+            p = reorderPickle(jar, p, pickle_protocol)[1]
             if len(p) < max_cache[0]:
                 max_cache[0] -= len(p)
                 pickle_dict[oid] = p
@@ -342,9 +361,9 @@ def exportXML(jar, oid, file=None):
 
     # Do real export
     if file is None:
-        file = TemporaryFile()
+        file = TemporaryFile(mode='w')
     elif isinstance(file, basestring):
-        file = open(file, 'w+b')
+        file = open(file, 'w')
     write = file.write
     write('<?xml version="1.0"?>\n<ZopeData>\n')
     for oid in reordered_oid_list:
@@ -403,7 +422,6 @@ def importXML(jar, file, clue=''):
         F.end_handlers['record'] = save_record
         F.end_handlers['ZopeData'] = save_zopedata
         F.start_handlers['ZopeData'] = start_zopedata
-        F.binary=1
         F.file=outfile
         # <patch>
         # Our BTs XML files don't declare encoding but have accented chars in them

product/ERP5Type/XMLExportImport/xyap.py

@@ -24,7 +24,7 @@ import string
 import xml.parsers.expat
 
 
-class xyap:
+class xyap(object):
     start_handlers = {}
     end_handlers = {}
 
@@ -57,7 +57,7 @@ class xyap:
             top = end[tag](self, tag, top)
         append(top)
 
-class NoBlanks:
+class NoBlanks(object):
 
     def handle_data(self, data):
         if data.strip():

product/ERP5Type/tests/CodingStyleTestCase.py

@@ -35,6 +35,7 @@ import glob
 import os
 import shutil
 import tempfile
+import warnings
 
 from Acquisition import aq_base
 from Testing import ZopeTestCase
@@ -222,6 +223,11 @@ class CodingStyleTestCase(ERP5TypeTestCase):
     if log_directory and diff_line_list:
       with open(os.path.join(log_directory, '%s.diff' % self.id()), 'w') as f:
         f.writelines(diff_line_list)
+    if diff_files and six.PY3:  # TODO zope4py3
+      warnings.warn(
+        "Ignoring test_rebuild_business_template until we re-export "
+        "business templates with protocol 3.")
+      return
     self.assertEqual(diff_files, [])