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-rw-r--r--synapse/handlers/federation.py69
1 files changed, 50 insertions, 19 deletions
diff --git a/synapse/handlers/federation.py b/synapse/handlers/federation.py
index 880cbd77e7..78f2bfc212 100644
--- a/synapse/handlers/federation.py
+++ b/synapse/handlers/federation.py
@@ -516,30 +516,59 @@ class FederationHandler(BaseHandler):
                 # FIXME
                 pass
 
-            for e in auth_chain:
-                e.internal_metadata.outlier = True
+            auth_ids_to_deferred = {}
+
+            def process_auth_ev(ev):
+                auth_ids = [e_id for e_id, _ in ev.auth_events]
+
+                prev_ds = [
+                    auth_ids_to_deferred[i]
+                    for i in auth_ids
+                    if i in auth_ids_to_deferred
+                ]
+
+                d = defer.Deferred()
+
+                auth_ids_to_deferred[ev.event_id] = d
+
+                @defer.inlineCallbacks
+                def f(*_):
+                    ev.internal_metadata.outlier = True
+
+                    try:
+                        auth = {
+                            (e.type, e.state_key): e for e in auth_chain
+                            if e.event_id in auth_ids
+                        }
+
+                        yield self._handle_new_event(
+                            origin, ev, auth_events=auth
+                        )
+                    except:
+                        logger.exception(
+                            "Failed to handle auth event %s",
+                            ev.event_id,
+                        )
+
+                    d.callback(None)
+
+                if prev_ds:
+                    dx = defer.DeferredList(prev_ds)
+                    dx.addBoth(f)
+                else:
+                    f()
 
+            for e in auth_chain:
                 if e.event_id == event.event_id:
-                    continue
+                    return
+                process_auth_ev(e)
 
-                try:
-                    auth_ids = [e_id for e_id, _ in e.auth_events]
-                    auth = {
-                        (e.type, e.state_key): e for e in auth_chain
-                        if e.event_id in auth_ids
-                    }
-                    yield self._handle_new_event(
-                        origin, e, auth_events=auth
-                    )
-                except:
-                    logger.exception(
-                        "Failed to handle auth event %s",
-                        e.event_id,
-                    )
+            yield defer.DeferredList(auth_ids_to_deferred.values())
 
-            for e in state:
+            @defer.inlineCallbacks
+            def handle_state(e):
                 if e.event_id == event.event_id:
-                    continue
+                    return
 
                 e.internal_metadata.outlier = True
                 try:
@@ -557,6 +586,8 @@ class FederationHandler(BaseHandler):
                         e.event_id,
                     )
 
+            yield defer.DeferredList([handle_state(e) for e in state])
+
             auth_ids = [e_id for e_id, _ in event.auth_events]
             auth_events = {
                 (e.type, e.state_key): e for e in auth_chain