Hopefully mypy is happy now

synapse/logging/context.py

@@ -210,7 +210,7 @@ class LoggingContext(object):
     class Sentinel(object):
         """Sentinel to represent the root context"""
 
-        __slots__ = ["previous_context", "alive", "request", "scope"]
+        __slots__ = ["previous_context", "alive", "request", "scope", "tag"]
 
         def __init__(self) -> None:
             # Minimal set for compatibility with LoggingContext
@@ -218,6 +218,7 @@ class LoggingContext(object):
             self.alive = None
             self.request = None
             self.scope = None
+            self.tag = None
 
         def __str__(self):
             return "sentinel"

synapse/storage/database.py

@@ -29,7 +29,11 @@ from twisted.internet import defer
 
 from synapse.api.errors import StoreError
 from synapse.config.database import DatabaseConnectionConfig
-from synapse.logging.context import LoggingContext, make_deferred_yieldable
+from synapse.logging.context import (
+    LoggingContext,
+    LoggingContextOrSentinel,
+    make_deferred_yieldable,
+)
 from synapse.metrics.background_process_metrics import run_as_background_process
 from synapse.storage.background_updates import BackgroundUpdater
 from synapse.storage.engines import BaseDatabaseEngine, PostgresEngine, Sqlite3Engine
@@ -543,7 +547,9 @@ class Database(object):
         Returns:
             Deferred: The result of func
         """
-        parent_context = LoggingContext.current_context()
+        parent_context = (
+            LoggingContext.current_context()
+        )  # type: Optional[LoggingContextOrSentinel]
         if parent_context == LoggingContext.sentinel:
             logger.warning(
                 "Starting db connection from sentinel context: metrics will be lost"