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-rw-r--r--synapse/rest/client/notifications.py9
-rw-r--r--synapse/rest/client/sync.py132
2 files changed, 45 insertions, 96 deletions
diff --git a/synapse/rest/client/notifications.py b/synapse/rest/client/notifications.py
index 20377a9ac6..ff040de6b8 100644
--- a/synapse/rest/client/notifications.py
+++ b/synapse/rest/client/notifications.py
@@ -16,7 +16,10 @@ import logging
 from typing import TYPE_CHECKING, Tuple
 
 from synapse.api.constants import ReceiptTypes
-from synapse.events.utils import format_event_for_client_v2_without_room_id
+from synapse.events.utils import (
+    SerializeEventConfig,
+    format_event_for_client_v2_without_room_id,
+)
 from synapse.http.server import HttpServer
 from synapse.http.servlet import RestServlet, parse_integer, parse_string
 from synapse.http.site import SynapseRequest
@@ -75,7 +78,9 @@ class NotificationsServlet(RestServlet):
                     self._event_serializer.serialize_event(
                         notif_events[pa.event_id],
                         self.clock.time_msec(),
-                        event_format=format_event_for_client_v2_without_room_id,
+                        config=SerializeEventConfig(
+                            event_format=format_event_for_client_v2_without_room_id
+                        ),
                     )
                 ),
             }
diff --git a/synapse/rest/client/sync.py b/synapse/rest/client/sync.py
index f3018ff690..53c385a86c 100644
--- a/synapse/rest/client/sync.py
+++ b/synapse/rest/client/sync.py
@@ -14,24 +14,14 @@
 import itertools
 import logging
 from collections import defaultdict
-from typing import (
-    TYPE_CHECKING,
-    Any,
-    Callable,
-    Dict,
-    Iterable,
-    List,
-    Optional,
-    Tuple,
-    Union,
-)
+from typing import TYPE_CHECKING, Any, Dict, List, Optional, Tuple, Union
 
 from synapse.api.constants import Membership, PresenceState
 from synapse.api.errors import Codes, StoreError, SynapseError
 from synapse.api.filtering import FilterCollection
 from synapse.api.presence import UserPresenceState
-from synapse.events import EventBase
 from synapse.events.utils import (
+    SerializeEventConfig,
     format_event_for_client_v2_without_room_id,
     format_event_raw,
 )
@@ -48,7 +38,6 @@ from synapse.http.server import HttpServer
 from synapse.http.servlet import RestServlet, parse_boolean, parse_integer, parse_string
 from synapse.http.site import SynapseRequest
 from synapse.logging.opentracing import trace
-from synapse.storage.databases.main.relations import BundledAggregations
 from synapse.types import JsonDict, StreamToken
 from synapse.util import json_decoder
 
@@ -239,28 +228,31 @@ class SyncRestServlet(RestServlet):
         else:
             raise Exception("Unknown event format %s" % (filter.event_format,))
 
+        serialize_options = SerializeEventConfig(
+            event_format=event_formatter,
+            token_id=access_token_id,
+            only_event_fields=filter.event_fields,
+        )
+        stripped_serialize_options = SerializeEventConfig(
+            event_format=event_formatter,
+            token_id=access_token_id,
+            include_stripped_room_state=True,
+        )
+
         joined = await self.encode_joined(
-            sync_result.joined,
-            time_now,
-            access_token_id,
-            filter.event_fields,
-            event_formatter,
+            sync_result.joined, time_now, serialize_options
         )
 
         invited = await self.encode_invited(
-            sync_result.invited, time_now, access_token_id, event_formatter
+            sync_result.invited, time_now, stripped_serialize_options
         )
 
         knocked = await self.encode_knocked(
-            sync_result.knocked, time_now, access_token_id, event_formatter
+            sync_result.knocked, time_now, stripped_serialize_options
         )
 
         archived = await self.encode_archived(
-            sync_result.archived,
-            time_now,
-            access_token_id,
-            filter.event_fields,
-            event_formatter,
+            sync_result.archived, time_now, serialize_options
         )
 
         logger.debug("building sync response dict")
@@ -339,9 +331,7 @@ class SyncRestServlet(RestServlet):
         self,
         rooms: List[JoinedSyncResult],
         time_now: int,
-        token_id: Optional[int],
-        event_fields: List[str],
-        event_formatter: Callable[[JsonDict], JsonDict],
+        serialize_options: SerializeEventConfig,
     ) -> JsonDict:
         """
         Encode the joined rooms in a sync result
@@ -349,24 +339,14 @@ class SyncRestServlet(RestServlet):
         Args:
             rooms: list of sync results for rooms this user is joined to
             time_now: current time - used as a baseline for age calculations
-            token_id: ID of the user's auth token - used for namespacing
-                of transaction IDs
-            event_fields: List of event fields to include. If empty,
-                all fields will be returned.
-            event_formatter: function to convert from federation format
-                to client format
+            serialize_options: Event serializer options
         Returns:
             The joined rooms list, in our response format
         """
         joined = {}
         for room in rooms:
             joined[room.room_id] = await self.encode_room(
-                room,
-                time_now,
-                token_id,
-                joined=True,
-                only_fields=event_fields,
-                event_formatter=event_formatter,
+                room, time_now, joined=True, serialize_options=serialize_options
             )
 
         return joined
@@ -376,8 +356,7 @@ class SyncRestServlet(RestServlet):
         self,
         rooms: List[InvitedSyncResult],
         time_now: int,
-        token_id: Optional[int],
-        event_formatter: Callable[[JsonDict], JsonDict],
+        serialize_options: SerializeEventConfig,
     ) -> JsonDict:
         """
         Encode the invited rooms in a sync result
@@ -385,10 +364,7 @@ class SyncRestServlet(RestServlet):
         Args:
             rooms: list of sync results for rooms this user is invited to
             time_now: current time - used as a baseline for age calculations
-            token_id: ID of the user's auth token - used for namespacing
-                of transaction IDs
-            event_formatter: function to convert from federation format
-                to client format
+            serialize_options: Event serializer options
 
         Returns:
             The invited rooms list, in our response format
@@ -396,11 +372,7 @@ class SyncRestServlet(RestServlet):
         invited = {}
         for room in rooms:
             invite = self._event_serializer.serialize_event(
-                room.invite,
-                time_now,
-                token_id=token_id,
-                event_format=event_formatter,
-                include_stripped_room_state=True,
+                room.invite, time_now, config=serialize_options
             )
             unsigned = dict(invite.get("unsigned", {}))
             invite["unsigned"] = unsigned
@@ -415,8 +387,7 @@ class SyncRestServlet(RestServlet):
         self,
         rooms: List[KnockedSyncResult],
         time_now: int,
-        token_id: Optional[int],
-        event_formatter: Callable[[Dict], Dict],
+        serialize_options: SerializeEventConfig,
     ) -> Dict[str, Dict[str, Any]]:
         """
         Encode the rooms we've knocked on in a sync result.
@@ -424,8 +395,7 @@ class SyncRestServlet(RestServlet):
         Args:
             rooms: list of sync results for rooms this user is knocking on
             time_now: current time - used as a baseline for age calculations
-            token_id: ID of the user's auth token - used for namespacing of transaction IDs
-            event_formatter: function to convert from federation format to client format
+            serialize_options: Event serializer options
 
         Returns:
             The list of rooms the user has knocked on, in our response format.
@@ -433,11 +403,7 @@ class SyncRestServlet(RestServlet):
         knocked = {}
         for room in rooms:
             knock = self._event_serializer.serialize_event(
-                room.knock,
-                time_now,
-                token_id=token_id,
-                event_format=event_formatter,
-                include_stripped_room_state=True,
+                room.knock, time_now, config=serialize_options
             )
 
             # Extract the `unsigned` key from the knock event.
@@ -470,9 +436,7 @@ class SyncRestServlet(RestServlet):
         self,
         rooms: List[ArchivedSyncResult],
         time_now: int,
-        token_id: Optional[int],
-        event_fields: List[str],
-        event_formatter: Callable[[JsonDict], JsonDict],
+        serialize_options: SerializeEventConfig,
     ) -> JsonDict:
         """
         Encode the archived rooms in a sync result
@@ -480,23 +444,14 @@ class SyncRestServlet(RestServlet):
         Args:
             rooms: list of sync results for rooms this user is joined to
             time_now: current time - used as a baseline for age calculations
-            token_id: ID of the user's auth token - used for namespacing
-                of transaction IDs
-            event_fields: List of event fields to include. If empty,
-                all fields will be returned.
-            event_formatter: function to convert from federation format to client format
+            serialize_options: Event serializer options
         Returns:
             The archived rooms list, in our response format
         """
         joined = {}
         for room in rooms:
             joined[room.room_id] = await self.encode_room(
-                room,
-                time_now,
-                token_id,
-                joined=False,
-                only_fields=event_fields,
-                event_formatter=event_formatter,
+                room, time_now, joined=False, serialize_options=serialize_options
             )
 
         return joined
@@ -505,10 +460,8 @@ class SyncRestServlet(RestServlet):
         self,
         room: Union[JoinedSyncResult, ArchivedSyncResult],
         time_now: int,
-        token_id: Optional[int],
         joined: bool,
-        only_fields: Optional[List[str]],
-        event_formatter: Callable[[JsonDict], JsonDict],
+        serialize_options: SerializeEventConfig,
     ) -> JsonDict:
         """
         Args:
@@ -524,20 +477,6 @@ class SyncRestServlet(RestServlet):
         Returns:
             The room, encoded in our response format
         """
-
-        def serialize(
-            events: Iterable[EventBase],
-            aggregations: Optional[Dict[str, BundledAggregations]] = None,
-        ) -> List[JsonDict]:
-            return self._event_serializer.serialize_events(
-                events,
-                time_now=time_now,
-                bundle_aggregations=aggregations,
-                token_id=token_id,
-                event_format=event_formatter,
-                only_event_fields=only_fields,
-            )
-
         state_dict = room.state
         timeline_events = room.timeline.events
 
@@ -554,9 +493,14 @@ class SyncRestServlet(RestServlet):
                     event.room_id,
                 )
 
-        serialized_state = serialize(state_events)
-        serialized_timeline = serialize(
-            timeline_events, room.timeline.bundled_aggregations
+        serialized_state = self._event_serializer.serialize_events(
+            state_events, time_now, config=serialize_options
+        )
+        serialized_timeline = self._event_serializer.serialize_events(
+            timeline_events,
+            time_now,
+            config=serialize_options,
+            bundle_aggregations=room.timeline.bundled_aggregations,
         )
 
         account_data = room.account_data