Split AccountDataStore and TagStore

3 files changed, 65 insertions, 33 deletions

diff --git a/synapse/storage/__init__.py b/synapse/storage/__init__.py
index e1c4fe086e..e221284ee2 100644
--- a/synapse/storage/__init__.py
+++ b/synapse/storage/__init__.py
@@ -104,9 +104,6 @@ class DataStore(RoomMemberStore, RoomStore,
             db_conn, "events", "stream_ordering", step=-1,
             extra_tables=[("ex_outlier_stream", "event_stream_ordering")]
         )
-        self._account_data_id_gen = StreamIdGenerator(
-            db_conn, "account_data_max_stream_id", "stream_id"
-        )
         self._presence_id_gen = StreamIdGenerator(
             db_conn, "presence_stream", "stream_id"
         )
@@ -159,11 +156,6 @@ class DataStore(RoomMemberStore, RoomStore,
             "MembershipStreamChangeCache", events_max,
         )
 
-        account_max = self._account_data_id_gen.get_current_token()
-        self._account_data_stream_cache = StreamChangeCache(
-            "AccountDataAndTagsChangeCache", account_max,
-        )
-
         self._presence_on_startup = self._get_active_presence(db_conn)
 
         presence_cache_prefill, min_presence_val = self._get_cache_dict(
diff --git a/synapse/storage/account_data.py b/synapse/storage/account_data.py
index 56a0bde549..66fed4bdcf 100644
--- a/synapse/storage/account_data.py
+++ b/synapse/storage/account_data.py
@@ -13,18 +13,46 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-from ._base import SQLBaseStore
 from twisted.internet import defer
 
+from ._base import SQLBaseStore
+from .util.id_generators import StreamIdGenerator
+
+from synapse.util.caches.stream_change_cache import StreamChangeCache
 from synapse.util.caches.descriptors import cached, cachedList, cachedInlineCallbacks
 
+import abc
 import ujson as json
 import logging
 
 logger = logging.getLogger(__name__)
 
 
-class AccountDataStore(SQLBaseStore):
+class AccountDataWorkerStore(SQLBaseStore):
+    """This is an abstract base class where subclasses must implement
+    `get_max_account_data_stream_id` which can be called in the initializer.
+    """
+
+    # This ABCMeta metaclass ensures that we cannot be instantiated without
+    # the abstract methods being implemented.
+    __metaclass__ = abc.ABCMeta
+
+    def __init__(self, db_conn, hs):
+        account_max = self.get_max_account_data_stream_id()
+        self._account_data_stream_cache = StreamChangeCache(
+            "AccountDataAndTagsChangeCache", account_max,
+        )
+
+        super(AccountDataWorkerStore, self).__init__(db_conn, hs)
+
+    @abc.abstractmethod
+    def get_max_account_data_stream_id(self):
+        """Get the current max stream ID for account data stream
+
+        Returns:
+            int
+        """
+        raise NotImplementedError()
 
     @cached()
     def get_account_data_for_user(self, user_id):
@@ -209,6 +237,36 @@ class AccountDataStore(SQLBaseStore):
             "get_updated_account_data_for_user", get_updated_account_data_for_user_txn
         )
 
+    @cachedInlineCallbacks(num_args=2, cache_context=True, max_entries=5000)
+    def is_ignored_by(self, ignored_user_id, ignorer_user_id, cache_context):
+        ignored_account_data = yield self.get_global_account_data_by_type_for_user(
+            "m.ignored_user_list", ignorer_user_id,
+            on_invalidate=cache_context.invalidate,
+        )
+        if not ignored_account_data:
+            defer.returnValue(False)
+
+        defer.returnValue(
+            ignored_user_id in ignored_account_data.get("ignored_users", {})
+        )
+
+
+class AccountDataStore(AccountDataWorkerStore):
+    def __init__(self, db_conn, hs):
+        self._account_data_id_gen = StreamIdGenerator(
+            db_conn, "account_data_max_stream_id", "stream_id"
+        )
+
+        super(AccountDataStore, self).__init__(db_conn, hs)
+
+    def get_max_account_data_stream_id(self):
+        """Get the current max stream id for the private user data stream
+
+        Returns:
+            A deferred int.
+        """
+        return self._account_data_id_gen.get_current_token()
+
     @defer.inlineCallbacks
     def add_account_data_to_room(self, user_id, room_id, account_data_type, content):
         """Add some account_data to a room for a user.
@@ -321,16 +379,3 @@ class AccountDataStore(SQLBaseStore):
             "update_account_data_max_stream_id",
             _update,
         )
-
-    @cachedInlineCallbacks(num_args=2, cache_context=True, max_entries=5000)
-    def is_ignored_by(self, ignored_user_id, ignorer_user_id, cache_context):
-        ignored_account_data = yield self.get_global_account_data_by_type_for_user(
-            "m.ignored_user_list", ignorer_user_id,
-            on_invalidate=cache_context.invalidate,
-        )
-        if not ignored_account_data:
-            defer.returnValue(False)
-
-        defer.returnValue(
-            ignored_user_id in ignored_account_data.get("ignored_users", {})
-        )
diff --git a/synapse/storage/tags.py b/synapse/storage/tags.py
index bff73f3f04..484d66991a 100644
--- a/synapse/storage/tags.py
+++ b/synapse/storage/tags.py
@@ -13,7 +13,8 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-from ._base import SQLBaseStore
+from .account_data import AccountDataWorkerStore
+
 from synapse.util.caches.descriptors import cached
 from twisted.internet import defer
 
@@ -23,15 +24,7 @@ import logging
 logger = logging.getLogger(__name__)
 
 
-class TagsStore(SQLBaseStore):
-    def get_max_account_data_stream_id(self):
-        """Get the current max stream id for the private user data stream
-
-        Returns:
-            A deferred int.
-        """
-        return self._account_data_id_gen.get_current_token()
-
+class TagsWorkerStore(AccountDataWorkerStore):
     @cached()
     def get_tags_for_user(self, user_id):
         """Get all the tags for a user.
@@ -170,6 +163,8 @@ class TagsStore(SQLBaseStore):
             row["tag"]: json.loads(row["content"]) for row in rows
         })
 
+
+class TagsStore(TagsWorkerStore):
     @defer.inlineCallbacks
     def add_tag_to_room(self, user_id, room_id, tag, content):
         """Add a tag to a room for a user.