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bugfix: fix race condition when updating presence via /sync (#2470)

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* bugfix: fix race condition when updating presence via /sync

Previously when presence is updated via /sync, we would send the presence update
asyncly via NATS. This created a race condition:
 - If the presence update is processed quickly, the /sync which triggered the presence
   update would see an online presence.
 - If the presence update was processed slowly, the /sync which triggered the presence
   update would see an offline presence.

This is the root cause behind the flakey sytest: 'User sees their own presence in a sync'.

The fix is to ensure we update the database/advance the stream position synchronously
for local users.

* Bugfix for test
This commit is contained in:
kegsay 2022-05-17 15:53:08 +01:00 • committed by GitHub
parent ac92e04772
commit b3162755a9
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5 changed files with 103 additions and 20 deletions
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15
syncapi/sync/requestpool.go
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@ -53,19 +53,24 @@ type RequestPool struct {
streams *streams.Streams
Notifier *notifier.Notifier
producer PresencePublisher
consumer PresenceConsumer
}
type PresencePublisher interface {
SendPresence(userID string, presence types.Presence, statusMsg *string) error
}
type PresenceConsumer interface {
EmitPresence(ctx context.Context, userID string, presence types.Presence, statusMsg *string, ts int, fromSync bool)
}
// NewRequestPool makes a new RequestPool
func NewRequestPool(
db storage.Database, cfg *config.SyncAPI,
userAPI userapi.SyncUserAPI, keyAPI keyapi.SyncKeyAPI,
rsAPI roomserverAPI.SyncRoomserverAPI,
streams *streams.Streams, notifier *notifier.Notifier,
producer PresencePublisher, enableMetrics bool,
producer PresencePublisher, consumer PresenceConsumer, enableMetrics bool,
) *RequestPool {
if enableMetrics {
prometheus.MustRegister(
@ -83,6 +88,7 @@ func NewRequestPool(
streams: streams,
Notifier: notifier,
producer: producer,
consumer: consumer,
}
go rp.cleanLastSeen()
go rp.cleanPresence(db, time.Minute*5)
@ -160,6 +166,13 @@ func (rp *RequestPool) updatePresence(db storage.Presence, presence string, user
logrus.WithError(err).Error("Unable to publish presence message from sync")
return
}
// now synchronously update our view of the world. It's critical we do this before calculating
// the /sync response else we may not return presence: online immediately.
rp.consumer.EmitPresence(
context.Background(), userID, presenceID, newPresence.ClientFields.StatusMsg,
int(gomatrixserverlib.AsTimestamp(time.Now())), true,
)
}
func (rp *RequestPool) updateLastSeen(req *http.Request, device *userapi.Device) {