Fix off-by-one in sync counter

The sync counter up to this point has not counted the currently
running sync task.  Keep track of that in a thread-safe way
so the counter is accurate and the user can actually know if the
system is fully synced.

Change-Id: I22a1c5d15c46f3e1785c439e72f8a9e5503d6935

gertty/sync.py

@@ -56,12 +56,17 @@ class MultiQueue(object):
         for key in priorities:
             self.queues[key] = collections.deque()
         self.condition = threading.Condition()
+        self.incomplete = []
 
     def qsize(self):
         count = 0
-        for queue in self.queues.values():
-            count += len(queue)
-        return count
+        self.condition.acquire()
+        try:
+            for queue in self.queues.values():
+                count += len(queue)
+            return count + len(self.incomplete)
+        finally:
+            self.condition.release()
 
     def put(self, item, priority):
         added = False
@@ -82,6 +87,7 @@ class MultiQueue(object):
                 for queue in self.queues.values():
                     try:
                         ret = queue.popleft()
+                        self.incomplete.append(ret)
                         return ret
                     except IndexError:
                         pass
@@ -100,6 +106,14 @@ class MultiQueue(object):
             self.condition.release()
         return results
 
+    def complete(self, item):
+        self.condition.acquire()
+        try:
+            if item in self.incomplete:
+                self.incomplete.remove(item)
+        finally:
+            self.condition.release()
+
 
 class UpdateEvent(object):
     def updateRelatedChanges(self, session, change):
@@ -1335,6 +1349,7 @@ class Sync(object):
         try:
             task.run(self)
             task.complete(True)
+            self.queue.complete(task)
         except requests.ConnectionError as e:
             self.log.warning("Offline due to: %s" % (e,))
             if not self.offline:
@@ -1347,6 +1362,7 @@ class Sync(object):
             return task
         except Exception:
             task.complete(False)
+            self.queue.complete(task)
             self.log.exception('Exception running task %s' % (task,))
             self.app.status.update(error=True, refresh=False)
         self.offline = False