Wrap a number of things that run in the background

This will reduce the number of "Starting db connection from sentinel context"
warnings, and will help with our metrics.

2 files changed, 14 insertions, 2 deletions

diff --git a/synapse/rest/media/v1/media_repository.py b/synapse/rest/media/v1/media_repository.py
index 30242c525a..5b13378caa 100644
--- a/synapse/rest/media/v1/media_repository.py
+++ b/synapse/rest/media/v1/media_repository.py
@@ -35,6 +35,7 @@ from synapse.api.errors import (
     SynapseError,
 )
 from synapse.http.matrixfederationclient import MatrixFederationHttpClient
+from synapse.metrics.background_process_metrics import run_as_background_process
 from synapse.util.async import Linearizer
 from synapse.util.logcontext import make_deferred_yieldable
 from synapse.util.retryutils import NotRetryingDestination
@@ -100,10 +101,15 @@ class MediaRepository(object):
         )
 
         self.clock.looping_call(
-            self._update_recently_accessed,
+            self._start_update_recently_accessed,
             UPDATE_RECENTLY_ACCESSED_TS,
         )
 
+    def _start_update_recently_accessed(self):
+        run_as_background_process(
+            "update_recently_accessed_media", self._update_recently_accessed,
+        )
+
     @defer.inlineCallbacks
     def _update_recently_accessed(self):
         remote_media = self.recently_accessed_remotes
diff --git a/synapse/rest/media/v1/preview_url_resource.py b/synapse/rest/media/v1/preview_url_resource.py
index b70b15c4c2..4efd5339a4 100644
--- a/synapse/rest/media/v1/preview_url_resource.py
+++ b/synapse/rest/media/v1/preview_url_resource.py
@@ -41,6 +41,7 @@ from synapse.http.server import (
     wrap_json_request_handler,
 )
 from synapse.http.servlet import parse_integer, parse_string
+from synapse.metrics.background_process_metrics import run_as_background_process
 from synapse.util.async import ObservableDeferred
 from synapse.util.caches.expiringcache import ExpiringCache
 from synapse.util.logcontext import make_deferred_yieldable, run_in_background
@@ -81,7 +82,7 @@ class PreviewUrlResource(Resource):
         self._cache.start()
 
         self._cleaner_loop = self.clock.looping_call(
-            self._expire_url_cache_data, 10 * 1000
+            self._start_expire_url_cache_data, 10 * 1000,
         )
 
     def render_OPTIONS(self, request):
@@ -371,6 +372,11 @@ class PreviewUrlResource(Resource):
             "etag": headers["ETag"][0] if "ETag" in headers else None,
         })
 
+    def _start_expire_url_cache_data(self):
+        run_as_background_process(
+            "expire_url_cache_data", self._expire_url_cache_data,
+        )
+
     @defer.inlineCallbacks
     def _expire_url_cache_data(self):
         """Clean up expired url cache content, media and thumbnails.