update serializers

README.md

@@ -410,6 +410,16 @@ single cassette.
 *Note*: Back up your cassettes files before migration.
 The migration *should* only modify cassettes using the old 0.x format.
 
+## New serializer / deserializer API
+
+If you made a custom serializer, you will need to update it to match the new
+API in version 1.0.x
+
+ * Serializers now take dicts and return strings.
+ * Deserializers take strings and return dicts (instead of requests, responses
+   pair)
+
+
 ## Changelog
   * 1.0.0 (in development) - _BACKWARDS INCOMPATIBLE_: Please see the 'upgrade'
     section in the README.  Add support for filtering sensitive data from

tests/fixtures/wild/domain_redirect.yaml

@@ -1,3 +1,5 @@
+version: 1
+interactions:
 - request:
     body: null
     headers:

tests/integration/test_register_serializer.py

@@ -10,7 +10,7 @@ class MockSerializer(object):
     def deserialize(self, cassette_string):
         self.serialize_count += 1
         self.cassette_string = cassette_string
-        return []
+        return {'interactions':[]}
 
     def serialize(self, cassette_dict):
         self.deserialize_count += 1

vcr/persist.py

@@ -1,30 +1,12 @@
-import tempfile
-
 from .persisters.filesystem import FilesystemPersister
 from .serialize import serialize, deserialize
 
 
-def _check_for_old_cassette(cassette_content):
-    # crate tmp with cassete content and try to migrate it
-    with tempfile.NamedTemporaryFile(mode='w+') as f:
-        f.write(cassette_content)
-        f.seek(0)
-        if migration.try_migrate(f.name):
-            raise ValueError(
-                "Your cassette files were generated in an older version "
-                "of VCR. Delete your cassettes or run the migration script."
-                "See http://git.io/mHhLBg for more details."
-            )
-
 
 def load_cassette(cassette_path, serializer):
     with open(cassette_path) as f:
         cassette_content = f.read()
-        try:
-            cassette = deserialize(cassette_content, serializer)
-        except TypeError:
-            _check_for_old_cassette(cassette_content)
-            raise
+        cassette = deserialize(cassette_content, serializer)
         return cassette
 
 

vcr/serialize.py

@@ -1,6 +1,9 @@
 from vcr.serializers import compat
 from vcr.request import Request
 
+#version 1 cassettes started with VCR 1.0.x.  Before 1.0.x, there was no versioning.
+CASSETTE_FORMAT_VERSION = 1 
+
 """
 Just a general note on the serialization philosophy here:
 I prefer cassettes to be human-readable if possible.  Yaml serializes
@@ -16,18 +19,21 @@ Deserializing: string (yaml converts from utf-8) -> bytestring
 
 def deserialize(cassette_string, serializer):
     data = serializer.deserialize(cassette_string)
-    requests = [Request._from_dict(r['request']) for r in data]
-    responses = [r['response'] for r in data]
-    responses = [compat.convert_to_bytes(r['response']) for r in data]
+    requests = [Request._from_dict(r['request']) for r in data['interactions']]
+    responses = [compat.convert_to_bytes(r['response']) for r in data['interactions']]
     return requests, responses
 
 
 def serialize(cassette_dict, serializer):
-    data = ([{
+    interactions = ([{
         'request': request._to_dict(),
         'response': compat.convert_to_unicode(response),
     } for request, response in zip(
         cassette_dict['requests'],
         cassette_dict['responses'],
     )])
+    data = {
+        'version': CASSETTE_FORMAT_VERSION,
+        'interactions': interactions,
+    }
     return serializer.serialize(data)