Use symbolic names for replication stream names (#7768)

This makes it much easier to find where streams are referenced.

2 files changed, 9 insertions, 5 deletions

diff --git a/synapse/storage/data_stores/main/cache.py b/synapse/storage/data_stores/main/cache.py
index eac5a4e55b..d30766e543 100644
--- a/synapse/storage/data_stores/main/cache.py
+++ b/synapse/storage/data_stores/main/cache.py
@@ -19,7 +19,9 @@ import logging
 from typing import Any, Iterable, Optional, Tuple
 
 from synapse.api.constants import EventTypes
+from synapse.replication.tcp.streams import BackfillStream, CachesStream
 from synapse.replication.tcp.streams.events import (
+    EventsStream,
     EventsStreamCurrentStateRow,
     EventsStreamEventRow,
 )
@@ -71,10 +73,10 @@ class CacheInvalidationWorkerStore(SQLBaseStore):
         )
 
     def process_replication_rows(self, stream_name, instance_name, token, rows):
-        if stream_name == "events":
+        if stream_name == EventsStream.NAME:
             for row in rows:
                 self._process_event_stream_row(token, row)
-        elif stream_name == "backfill":
+        elif stream_name == BackfillStream.NAME:
             for row in rows:
                 self._invalidate_caches_for_event(
                     -token,
@@ -86,7 +88,7 @@ class CacheInvalidationWorkerStore(SQLBaseStore):
                     row.relates_to,
                     backfilled=True,
                 )
-        elif stream_name == "caches":
+        elif stream_name == CachesStream.NAME:
             if self._cache_id_gen:
                 self._cache_id_gen.advance(instance_name, token)
 
diff --git a/synapse/storage/data_stores/main/events_worker.py b/synapse/storage/data_stores/main/events_worker.py
index a48c7a96ca..47a3e63589 100644
--- a/synapse/storage/data_stores/main/events_worker.py
+++ b/synapse/storage/data_stores/main/events_worker.py
@@ -38,6 +38,8 @@ from synapse.events.utils import prune_event
 from synapse.logging.context import PreserveLoggingContext, current_context
 from synapse.metrics.background_process_metrics import run_as_background_process
 from synapse.replication.slave.storage._slaved_id_tracker import SlavedIdTracker
+from synapse.replication.tcp.streams import BackfillStream
+from synapse.replication.tcp.streams.events import EventsStream
 from synapse.storage._base import SQLBaseStore, make_in_list_sql_clause
 from synapse.storage.database import Database
 from synapse.storage.util.id_generators import StreamIdGenerator
@@ -113,9 +115,9 @@ class EventsWorkerStore(SQLBaseStore):
         self._event_fetch_ongoing = 0
 
     def process_replication_rows(self, stream_name, instance_name, token, rows):
-        if stream_name == "events":
+        if stream_name == EventsStream.NAME:
             self._stream_id_gen.advance(token)
-        elif stream_name == "backfill":
+        elif stream_name == BackfillStream.NAME:
             self._backfill_id_gen.advance(-token)
 
         super().process_replication_rows(stream_name, instance_name, token, rows)