From 72a4de2ce627528a13bda480403344ffde6275d3 Mon Sep 17 00:00:00 2001
From: Erik Johnston <erik@matrix.org>
Date: Tue, 17 Feb 2015 10:03:23 +0000
Subject: [PATCH 1/2] Use consumeErrors=True on all DeferredLists.

This is so that the DeferredLists actually consume the error instead of
propogating down the non-existent errback chain. This should reduce the
number of unhandled errors we are seeing.
---
 synapse/federation/federation_server.py | 2 +-
 synapse/federation/transaction_queue.py | 2 +-
 synapse/handlers/presence.py            | 8 ++++----
 synapse/notifier.py                     | 6 ++++--
 synapse/storage/roommember.py           | 2 +-
 5 files changed, 11 insertions(+), 9 deletions(-)

diff --git a/synapse/federation/federation_server.py b/synapse/federation/federation_server.py
index 9f5c98694..e94d0411b 100644
--- a/synapse/federation/federation_server.py
+++ b/synapse/federation/federation_server.py
@@ -124,7 +124,7 @@ class FederationServer(FederationBase):
                         edu.content
                     )
 
-            results = yield defer.DeferredList(dl)
+            results = yield defer.DeferredList(dl, consumeErrors=True)
 
         ret = []
         for r in results:
diff --git a/synapse/federation/transaction_queue.py b/synapse/federation/transaction_queue.py
index 731019ad9..bb20f2eba 100644
--- a/synapse/federation/transaction_queue.py
+++ b/synapse/federation/transaction_queue.py
@@ -98,7 +98,7 @@ class TransactionQueue(object):
 
             deferreds.append(deferred)
 
-        yield defer.DeferredList(deferreds)
+        yield defer.DeferredList(deferreds, consumeErrors=True)
 
     # NO inlineCallbacks
     def enqueue_edu(self, edu):
diff --git a/synapse/handlers/presence.py b/synapse/handlers/presence.py
index 59287010e..8ef248ecf 100644
--- a/synapse/handlers/presence.py
+++ b/synapse/handlers/presence.py
@@ -492,7 +492,7 @@ class PresenceHandler(BaseHandler):
                 user, domain, remoteusers
             ))
 
-        yield defer.DeferredList(deferreds)
+        yield defer.DeferredList(deferreds, consumeErrors=True)
 
     def _start_polling_local(self, user, target_user):
         target_localpart = target_user.localpart
@@ -548,7 +548,7 @@ class PresenceHandler(BaseHandler):
                 self._stop_polling_remote(user, domain, remoteusers)
             )
 
-        return defer.DeferredList(deferreds)
+        return defer.DeferredList(deferreds, consumeErrors=True)
 
     def _stop_polling_local(self, user, target_user):
         for localpart in self._local_pushmap.keys():
@@ -729,7 +729,7 @@ class PresenceHandler(BaseHandler):
                     del self._remote_sendmap[user]
 
         with PreserveLoggingContext():
-            yield defer.DeferredList(deferreds)
+            yield defer.DeferredList(deferreds, consumeErrors=True)
 
     @defer.inlineCallbacks
     def push_update_to_local_and_remote(self, observed_user, statuscache,
@@ -768,7 +768,7 @@ class PresenceHandler(BaseHandler):
                 )
             )
 
-        yield defer.DeferredList(deferreds)
+        yield defer.DeferredList(deferreds, consumeErrors=True)
 
         defer.returnValue((localusers, remote_domains))
 
diff --git a/synapse/notifier.py b/synapse/notifier.py
index e3b6ead62..f5a394596 100644
--- a/synapse/notifier.py
+++ b/synapse/notifier.py
@@ -135,7 +135,8 @@ class Notifier(object):
 
         with PreserveLoggingContext():
             yield defer.DeferredList(
-                [notify(l).addErrback(eb) for l in listeners]
+                [notify(l).addErrback(eb) for l in listeners],
+                consumeErrors=True,
             )
 
     @defer.inlineCallbacks
@@ -203,7 +204,8 @@ class Notifier(object):
 
         with PreserveLoggingContext():
             yield defer.DeferredList(
-                [notify(l).addErrback(eb) for l in listeners]
+                [notify(l).addErrback(eb) for l in listeners],
+                consumeErrors=True,
             )
 
     @defer.inlineCallbacks
diff --git a/synapse/storage/roommember.py b/synapse/storage/roommember.py
index 779f9ce54..9bf608bc9 100644
--- a/synapse/storage/roommember.py
+++ b/synapse/storage/roommember.py
@@ -288,7 +288,7 @@ class RoomMemberStore(SQLBaseStore):
 
         deferreds = [self.get_rooms_for_user(u) for u in user_id_list]
 
-        results = yield defer.DeferredList(deferreds)
+        results = yield defer.DeferredList(deferreds, consumeErrors=True)
 
         # A list of sets of strings giving room IDs for each user
         room_id_lists = [set([r.room_id for r in result[1]]) for result in results]

From c2b1dbd84c27be8759b14502b124504cba4c9295 Mon Sep 17 00:00:00 2001
From: Erik Johnston <erik@matrix.org>
Date: Tue, 17 Feb 2015 11:11:11 +0000
Subject: [PATCH 2/2] We do want to consumeError

---
 synapse/handlers/typing.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/synapse/handlers/typing.py b/synapse/handlers/typing.py
index c69787005..c2762f92c 100644
--- a/synapse/handlers/typing.py
+++ b/synapse/handlers/typing.py
@@ -181,7 +181,7 @@ class TypingNotificationHandler(BaseHandler):
                 },
             ))
 
-        yield defer.DeferredList(deferreds, consumeErrors=False)
+        yield defer.DeferredList(deferreds, consumeErrors=True)
 
     @defer.inlineCallbacks
     def _recv_edu(self, origin, content):