Migrate serverconf values to use picklefield

evennia/server/migrations/0002_auto_20190128_2311.py

@@ -2,8 +2,21 @@
 # Generated by Django 1.11.16 on 2019-01-28 23:11
 from __future__ import unicode_literals
 
+from base64 import b64encode
 from django.db import migrations
 import evennia.utils.picklefield
+from pickle import dumps, loads
+from evennia.utils.utils import to_bytes
+from copy import deepcopy
+
+
+def forwards(apps, schema_editor):
+    ServerConfig = apps.get_model('server', 'ServerConfig')
+    for conf in ServerConfig.objects.all():
+        # picklefield requires base64 encoding
+        value = loads(to_bytes(conf.db_value), encoding='bytes')   # py2->py3 byte encoding
+        conf.db_value = b64encode(dumps(deepcopy(value), protocol=4)).decode()
+        conf.save(update_fields=['db_value'])
 
 
 class Migration(migrations.Migration):
@@ -13,9 +26,11 @@ class Migration(migrations.Migration):
     ]
 
     operations = [
+        migrations.RunPython(forwards, migrations.RunPython.noop),
         migrations.AlterField(
             model_name='serverconfig',
             name='db_value',
             field=evennia.utils.picklefield.PickledObjectField(help_text='The data returned when the config value is accessed. Must be written as a Python literal if editing through the admin interface. Attribute values which are not Python literals cannot be edited through the admin interface.', null=True, verbose_name='value'),
         ),
+
     ]

evennia/server/models.py

@@ -13,6 +13,7 @@ import pickle
 from django.db import models
 from evennia.utils.idmapper.models import WeakSharedMemoryModel
 from evennia.utils import logger, utils
+from evennia.utils.dbserialize import to_pickle, from_pickle
 from evennia.server.manager import ServerConfigManager
 from evennia.utils import picklefield
 
@@ -86,7 +87,7 @@ class ServerConfig(WeakSharedMemoryModel):
     #@property
     def __value_get(self):
         "Getter. Allows for value = self.value"
-        return pickle.loads(utils.to_bytes(self.db_value))
+        return from_pickle(self.db_value, db_obj=self)
 
     #@value.setter
     def __value_set(self, value):
@@ -95,7 +96,7 @@ class ServerConfig(WeakSharedMemoryModel):
             # we have to protect against storing db objects.
             logger.log_err("ServerConfig cannot store db objects! (%s)" % value)
             return
-        self.db_value = pickle.dumps(value)
+        self.db_value = to_pickle(value)
         self.save()
 
     #@value.deleter
@@ -113,8 +114,8 @@ class ServerConfig(WeakSharedMemoryModel):
     # ServerConfig other methods
     #
 
-    def __unicode__(self):
+    def __repr__(self):
-        return "%s : %s" % (self.key, self.value)
+        return "<{} {}>".format(self.__class__.__name__, self.key, self.value)
 
     def store(self, key, value):
         """

evennia/utils/picklefield.py

@@ -46,17 +46,13 @@ from django.utils.html import format_html
 
 from evennia.utils.dbserialize import from_pickle, to_pickle
 from future.utils import with_metaclass
+from pickle import loads, dumps
 
 try:
     from django.utils.encoding import force_text
 except ImportError:
     from django.utils.encoding import force_unicode as force_text
 
-# python 3.x does not have cPickle module
-try:
-    from pickle import loads, dumps  # cpython 2.x
-except ImportError:
-    from pickle import loads, dumps  # cpython 3.x, other interpreters
 
 DEFAULT_PROTOCOL = 4