Refactor to add ObjectStore class.

2 files changed, 156 insertions, 140 deletions

diff --git a/backends/objectstore.py b/backends/objectstore.py
new file mode 100644
index 00000000..e36df72d
--- /dev/null
+++ b/backends/objectstore.py
@@ -0,0 +1,153 @@
+from u1db.backends import CommonBackend
+
+
+class ObjectStore(CommonBackend):
+
+    def __init__(self):
+        self._sync_log = SyncLog()
+        self._transaction_log = TransactionLog()
+
+    #-------------------------------------------------------------------------
+    # implemented methods from Database
+    #-------------------------------------------------------------------------
+
+    def set_document_factory(self, factory):
+        self._factory = factory
+
+    def set_document_size_limit(self, limit):
+        raise NotImplementedError(self.set_document_size_limit)
+
+    def whats_changed(self, old_generation=0):
+        self._get_u1db_data()
+        return self._transaction_log.whats_changed(old_generation)
+
+    def get_doc(self, doc_id, include_deleted=False):
+        doc = self._get_doc(doc_id, check_for_conflicts=True)
+        if doc is None:
+            return None
+        if doc.is_tombstone() and not include_deleted:
+            return None
+        return doc
+
+    def delete_doc(self, doc):
+        old_doc = self._get_doc(doc.doc_id, check_for_conflicts=True)
+        if old_doc is None:
+            raise errors.DocumentDoesNotExist
+        if old_doc.rev != doc.rev:
+            raise errors.RevisionConflict()
+        if old_doc.is_tombstone():
+            raise errors.DocumentAlreadyDeleted
+        if old_doc.has_conflicts:
+            raise errors.ConflictedDoc()
+        new_rev = self._allocate_doc_rev(doc.rev)
+        doc.rev = new_rev
+        doc.make_tombstone()
+        self._put_doc(olddoc)
+        return new_rev
+
+    # start of index-related methods: these are not supported by this backend.
+
+    def create_index(self, index_name, *index_expressions):
+        return False
+
+    def delete_index(self, index_name):
+        return False
+
+    def list_indexes(self):
+        return []
+
+    def get_from_index(self, index_name, *key_values):
+        return []
+
+    def get_range_from_index(self, index_name, start_value=None,
+                             end_value=None):
+        return []
+
+    def get_index_keys(self, index_name):
+        return []
+
+    # end of index-related methods: these are not supported by this backend.
+
+    def get_doc_conflicts(self, doc_id):
+        return []
+
+    def resolve_doc(self, doc, conflicted_doc_revs):
+        raise NotImplementedError(self.resolve_doc)
+
+    def _get_replica_gen_and_trans_id(self, other_replica_uid):
+        self._get_u1db_data()
+        return self._sync_log.get_replica_gen_and_trans_id(other_replica_uid)
+
+    def _set_replica_gen_and_trans_id(self, other_replica_uid,
+                                      other_generation, other_transaction_id):
+        self._get_u1db_data()
+        self._sync_log.set_replica_gen_and_trans_id(other_replica_uid,
+                                                    other_generation,
+                                                    other_transaction_id)
+        self._set_u1db_data()
+
+    #-------------------------------------------------------------------------
+    # implemented methods from CommonBackend
+    #-------------------------------------------------------------------------
+
+    def _get_generation(self):
+        self._get_u1db_data()
+        return self._transaction_log.get_generation()
+
+    def _get_generation_info(self):
+        self._get_u1db_data()
+        return self._transaction_log.get_generation_info()
+
+    def _has_conflicts(self, doc_id):
+        # Documents never have conflicts on server.
+        return False
+
+    def _put_and_update_indexes(self, doc_id, old_doc, new_rev, content):
+        raise NotImplementedError(self._put_and_update_indexes)
+
+
+    def _get_trans_id_for_gen(self, generation):
+        self._get_u1db_data()
+        trans_id = self._transaction_log.get_trans_id_for_gen(generation)
+        if trans_id is None:
+            raise errors.InvalidGeneration
+        return trans_id
+
+    def _ensure_u1db_data(self):
+        """
+        Guarantee that u1db data exists in store.
+        """
+        if not self._is_initialized():
+            self._initialize()
+        u1db_data = self._get_doc('u1db_data')
+        self._sync_log.log = u1db_data.content['sync_log']
+        self._transaction_log.log = u1db_data.content['transaction_log']
+
+    def _is_initialized(self):
+        """
+        Verify if u1db data exists in store.
+        """
+        if not self._get_doc('u1db_data'):
+            return False
+        return True
+
+    def _initialize(self):
+        """
+        Create u1db data object in store.
+        """
+        content = { 'transaction_log' : [],
+                    'sync_log' : [] }
+        doc = self.create_doc('u1db_data', content)
+
+    def _get_u1db_data(self):
+        data = self.get_doc('u1db_data').content
+        self._transaction_log = data['transaction_log']
+        self._sync_log = data['sync_log']
+
+    def _set_u1db_data(self):
+        doc = self._factory('u1db_data')
+        doc.content = { 'transaction_log' : self._transaction_log,
+                        'sync_log'        : self._sync_log }
+        self.put_doc(doc)
+
+
diff --git a/backends/openstack.py b/backends/openstack.py
index 6c971485..f8563d81 100644
--- a/backends/openstack.py
+++ b/backends/openstack.py
@@ -1,15 +1,16 @@
-from leap import *
 from u1db import errors
 from u1db.backends import CommonBackend
 from u1db.remote.http_target import HTTPSyncTarget
 from swiftclient import client
+from soledad.backends.objectstore import ObjectStore
 
 
-class OpenStackDatabase(CommonBackend):
+class OpenStackDatabase(ObjectStore):
     """A U1DB implementation that uses OpenStack as its persistence layer."""
 
     def __init__(self, auth_url, user, auth_key, container):
         """Create a new OpenStack data container."""
+        super(OpenStackDatabase, self)
         self._auth_url = auth_url
         self._user = user
         self._auth_key = auth_key
@@ -24,16 +25,6 @@ class OpenStackDatabase(CommonBackend):
     # implemented methods from Database
     #-------------------------------------------------------------------------
 
-    def set_document_factory(self, factory):
-        self._factory = factory
-
-    def set_document_size_limit(self, limit):
-        raise NotImplementedError(self.set_document_size_limit)
-
-    def whats_changed(self, old_generation=0):
-        self._get_u1db_data()
-        return self._transaction_log.whats_changed(old_generation)
-
     def _get_doc(self, doc_id, check_for_conflicts=False):
         """Get just the document content, without fancy handling.
         
@@ -47,14 +38,6 @@ class OpenStackDatabase(CommonBackend):
         except swiftclient.ClientException:
             return None
 
-    def get_doc(self, doc_id, include_deleted=False):
-        doc = self._get_doc(doc_id, check_for_conflicts=True)
-        if doc is None:
-            return None
-        if doc.is_tombstone() and not include_deleted:
-            return None
-        return doc
-
     def get_all_docs(self, include_deleted=False):
         """Get all documents from the database."""
         generation = self._get_generation()
@@ -84,51 +67,6 @@ class OpenStackDatabase(CommonBackend):
         self._set_u1db_data()
         return new_rev
 
-    def delete_doc(self, doc):
-        old_doc = self._get_doc(doc.doc_id, check_for_conflicts=True)
-        if old_doc is None:
-            raise errors.DocumentDoesNotExist
-        if old_doc.rev != doc.rev:
-            raise errors.RevisionConflict()
-        if old_doc.is_tombstone():
-            raise errors.DocumentAlreadyDeleted
-        if old_doc.has_conflicts:
-            raise errors.ConflictedDoc()
-        new_rev = self._allocate_doc_rev(doc.rev)
-        doc.rev = new_rev
-        doc.make_tombstone()
-        self._put_doc(olddoc)
-        return new_rev
-
-    # start of index-related methods: these are not supported by this backend.
-
-    def create_index(self, index_name, *index_expressions):
-        return False
-
-    def delete_index(self, index_name):
-        return False
-
-    def list_indexes(self):
-        return []
-
-    def get_from_index(self, index_name, *key_values):
-        return []
-
-    def get_range_from_index(self, index_name, start_value=None,
-                             end_value=None):
-        return []
-
-    def get_index_keys(self, index_name):
-        return []
-
-    # end of index-related methods: these are not supported by this backend.
-
-    def get_doc_conflicts(self, doc_id):
-        return []
-
-    def resolve_doc(self, doc, conflicted_doc_revs):
-        raise NotImplementedError(self.resolve_doc)
-
     def get_sync_target(self):
         return OpenStackSyncTarget(self)
 
@@ -141,89 +79,14 @@ class OpenStackDatabase(CommonBackend):
         return Synchronizer(self, OpenStackSyncTarget(url, creds=creds)).sync(
             autocreate=autocreate)
 
-    def _get_replica_gen_and_trans_id(self, other_replica_uid):
-        self._get_u1db_data()
-        return self._sync_log.get_replica_gen_and_trans_id(other_replica_uid)
-
-    def _set_replica_gen_and_trans_id(self, other_replica_uid,
-                                      other_generation, other_transaction_id):
-        self._get_u1db_data()
-        self._sync_log.set_replica_gen_and_trans_id(other_replica_uid,
-                                                    other_generation,
-                                                    other_transaction_id)
-        self._set_u1db_data()
-
-    #-------------------------------------------------------------------------
-    # implemented methods from CommonBackend
-    #-------------------------------------------------------------------------
-
-    def _get_generation(self):
-        self._get_u1db_data()
-        return self._transaction_log.get_generation()
-
-    def _get_generation_info(self):
-        self._get_u1db_data()
-        return self._transaction_log.get_generation_info()
-
-    def _has_conflicts(self, doc_id):
-        # Documents never have conflicts on server.
-        return False
-
-    def _put_and_update_indexes(self, doc_id, old_doc, new_rev, content):
-        raise NotImplementedError(self._put_and_update_indexes)
-
-
-    def _get_trans_id_for_gen(self, generation):
-        self._get_u1db_data()
-        trans_id = self._transaction_log.get_trans_id_for_gen(generation)
-        if trans_id is None:
-            raise errors.InvalidGeneration
-        return trans_id
-
     #-------------------------------------------------------------------------
     # OpenStack specific methods
     #-------------------------------------------------------------------------
 
-    def _ensure_u1db_data(self):
-        """
-        Guarantee that u1db data exists in store.
-        """
-        if self._is_initialized():
-            return
-        self._initialize()
-
-    def _is_initialized(self):
-        """
-        Verify if u1db data exists in store.
-        """
-        if not self._get_doc('u1db_data'):
-            return False
-        return True
-
-    def _initialize(self):
-        """
-        Create u1db data object in store.
-        """
-        content = { 'transaction_log' : [],
-                    'sync_log' : [] }
-        doc = self.create_doc('u1db_data', content)
-
     def _get_auth(self):
         self._url, self._auth_token = self._connection.get_auth()
         return self._url, self.auth_token
 
-    def _get_u1db_data(self):
-        data = self.get_doc('u1db_data').content
-        self._transaction_log = data['transaction_log']
-        self._sync_log = data['sync_log']
-
-    def _set_u1db_data(self):
-        doc = self._factory('u1db_data')
-        doc.content = { 'transaction_log' : self._transaction_log,
-                        'sync_log'        : self._sync_log }
-        self.put_doc(doc)
-
-
 class OpenStackSyncTarget(HTTPSyncTarget):
 
     def get_sync_info(self, source_replica_uid):