diff -r 621252e2cc18 -r f78caf12f32d app/soc/cron/unique_user_id_adder.py
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/app/soc/cron/unique_user_id_adder.py	Mon May 25 22:59:56 2009 +0200
@@ -0,0 +1,135 @@
+#!/usr/bin/python2.5
+#
+# Copyright 2009 the Melange authors.
+#
+# 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.
+
+"""Cron job handler for adding unique user id.
+"""
+
+__authors__ = [
+    '"Pawel Solyga" <pawel.solyga@gmail.com>',
+  ]
+
+
+from google.appengine.ext import db
+from google.appengine.api import users
+from soc.logic.models.job import logic as job_logic
+from soc.logic.models.priority_group import logic as priority_logic
+from soc.logic.models.user import logic as user_logic
+from soc.models.user import User
+
+
+# amount of users to create jobs for before updating
+DEF_USER_STEP_SIZE = 10
+
+
+class TempUserWithUniqueId(db.Model):
+  """Helper model for temporary storing User Property with unique id.
+  """
+  user = db.UserProperty(required=True)
+
+
+def emailToAccountAndUserId(address):
+  """Return a stable user_id string based on an email address, or None if
+  the address is not a valid/existing google account.
+  """
+  user = users.User(address)
+  key = TempUserWithUniqueId(user=user).put()
+  obj = TempUserWithUniqueId.get(key)
+  return (obj, obj.user.user_id())
+
+
+def setupUniqueUserIdAdder(job_entity):
+  """Job that setup jobs that will add unique user ids to all Users.
+
+  Args:
+    job_entity: a Job entity with key_data set to 
+                [last_completed_user]
+  """
+
+  from soc.cron.job import FatalJobError
+
+  user_fields = {'user_id': None}
+
+  if len(key_data) == 1:
+    # start where we left off
+    user_fields['__key__ >'] = key_data[0]
+
+  m_users = user_logic.getForFields(user_fields,
+                                    limit=DEF_USER_STEP_SIZE)
+
+  # set the default fields for the jobs we are going to create
+  priority_group = priority_logic.getGroup(priority_logic.CONVERT)
+  job_fields = {
+      'priority_group': priority_group,
+      'task_name': 'addUniqueUserIds'}
+
+  job_query_fields = job_fields.copy()
+
+  while m_users:
+    # for each user create a adder job
+    for user in m_users:
+
+      job_query_fields['key_data'] = user.key()
+      adder_job = job_logic.getForFields(job_query_fields, unique=True)
+
+      if not adder_job:
+        # this user doesn't have unique id yet
+        job_fields['key_data'] = [user.key()]
+        job_logic.updateOrCreateFromFields(job_fields)
+
+    # update our own job
+    last_user_key = m_users[-1].key()
+
+    if len(key_data) == 1:
+      key_data[0] = last_student_key
+    else:
+      key_data.append(last_student_key)
+
+    updated_job_fields = {'key_data': key_data}
+    job_logic.updateEntityProperties(job_entity, updated_job_fields)
+
+    # rinse and repeat
+    user_fields['__key__ >'] = last_user_key
+    m_users = student_logic.getForFields(user_fields,
+                                         limit=DEF_USER_STEP_SIZE)
+
+  # we are finished
+  return
+
+
+def addUniqueUserIds(job_entity):
+  """Job that will add unique user id to a User.
+
+  Args:
+    job_entity: a Job entity with key_data set to [user_key]
+  """
+
+  from soc.cron.job import FatalJobError
+
+  user_keyname = job_entity.key_data[0].name()
+  user_entity = user_logic.getFromKeyName(user_keyname)
+
+  if not user_entity:
+    raise FatalJobError('The User with keyname %s does not exist!' % (
+        user_keyname))
+
+  # add unique user id
+  account, user_id = emailToAccountAndUserId(user_entity.account.email())
+  user_entity.account = account
+  user_entity.user_id = user_id
+  user_entity.put()
+  
+  # we are done here
+  return
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