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-rw-r--r--synapse/http/server.py12
-rw-r--r--synapse/replication/tcp/resource.py6
-rw-r--r--synapse/rest/media/v1/preview_url_resource.py6
3 files changed, 18 insertions, 6 deletions
diff --git a/synapse/http/server.py b/synapse/http/server.py
index 3ca1c9947c..25466cd292 100644
--- a/synapse/http/server.py
+++ b/synapse/http/server.py
@@ -28,6 +28,7 @@ from canonicaljson import (
 )
 
 from twisted.internet import defer
+from twisted.python import failure
 from twisted.web import server, resource
 from twisted.web.server import NOT_DONE_YET
 from twisted.web.util import redirectTo
@@ -131,12 +132,17 @@ def wrap_request_handler(request_handler, include_metrics=False):
                             version_string=self.version_string,
                         )
                     except Exception:
-                        logger.exception(
-                            "Failed handle request %s.%s on %r: %r",
+                        # failure.Failure() fishes the original Failure out
+                        # of our stack, and thus gives us a sensible stack
+                        # trace.
+                        f = failure.Failure()
+                        logger.error(
+                            "Failed handle request %s.%s on %r: %r: %s",
                             request_handler.__module__,
                             request_handler.__name__,
                             self,
-                            request
+                            request,
+                            f.getTraceback().rstrip(),
                         )
                         respond_with_json(
                             request,
diff --git a/synapse/replication/tcp/resource.py b/synapse/replication/tcp/resource.py
index 1d03e79b85..786c3fe864 100644
--- a/synapse/replication/tcp/resource.py
+++ b/synapse/replication/tcp/resource.py
@@ -216,11 +216,12 @@ class ReplicationStreamer(object):
             self.federation_sender.federation_ack(token)
 
     @measure_func("repl.on_user_sync")
+    @defer.inlineCallbacks
     def on_user_sync(self, conn_id, user_id, is_syncing, last_sync_ms):
         """A client has started/stopped syncing on a worker.
         """
         user_sync_counter.inc()
-        self.presence_handler.update_external_syncs_row(
+        yield self.presence_handler.update_external_syncs_row(
             conn_id, user_id, is_syncing, last_sync_ms,
         )
 
@@ -244,11 +245,12 @@ class ReplicationStreamer(object):
         getattr(self.store, cache_func).invalidate(tuple(keys))
 
     @measure_func("repl.on_user_ip")
+    @defer.inlineCallbacks
     def on_user_ip(self, user_id, access_token, ip, user_agent, device_id, last_seen):
         """The client saw a user request
         """
         user_ip_cache_counter.inc()
-        self.store.insert_client_ip(
+        yield self.store.insert_client_ip(
             user_id, access_token, ip, user_agent, device_id, last_seen,
         )
 
diff --git a/synapse/rest/media/v1/preview_url_resource.py b/synapse/rest/media/v1/preview_url_resource.py
index 723f7043f4..65f86be205 100644
--- a/synapse/rest/media/v1/preview_url_resource.py
+++ b/synapse/rest/media/v1/preview_url_resource.py
@@ -25,7 +25,8 @@ from synapse.util.stringutils import random_string
 from synapse.util.caches.expiringcache import ExpiringCache
 from synapse.http.client import SpiderHttpClient
 from synapse.http.server import (
-    request_handler, respond_with_json_bytes
+    request_handler, respond_with_json_bytes,
+    respond_with_json,
 )
 from synapse.util.async import ObservableDeferred
 from synapse.util.stringutils import is_ascii
@@ -78,6 +79,9 @@ class PreviewUrlResource(Resource):
             self._expire_url_cache_data, 10 * 1000
         )
 
+    def render_OPTIONS(self, request):
+        return respond_with_json(request, 200, {}, send_cors=True)
+
     def render_GET(self, request):
         self._async_render_GET(request)
         return NOT_DONE_YET