1 files changed, 22 insertions, 11 deletions
diff --git a/synapse/util/__init__.py b/synapse/util/__init__.py
index fc11e26623..e9886ef299 100644
--- a/synapse/util/__init__.py
+++ b/synapse/util/__init__.py
@@ -13,15 +13,14 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-from synapse.util.logcontext import PreserveLoggingContext
-
-from twisted.internet import defer, reactor, task
-
-import time
 import logging
-
 from itertools import islice
 
+import attr
+from twisted.internet import defer, task
+
+from synapse.util.logcontext import PreserveLoggingContext
+
 logger = logging.getLogger(__name__)
 
 
@@ -31,16 +30,27 @@ def unwrapFirstError(failure):
     return failure.value.subFailure
 
 
+@attr.s
 class Clock(object):
-    """A small utility that obtains current time-of-day so that time may be
-    mocked during unit-tests.
+    """
+    A Clock wraps a Twisted reactor and provides utilities on top of it.
 
-    TODO(paul): Also move the sleep() functionality into it
+    Args:
+        reactor: The Twisted reactor to use.
     """
+    _reactor = attr.ib()
+
+    @defer.inlineCallbacks
+    def sleep(self, seconds):
+        d = defer.Deferred()
+        with PreserveLoggingContext():
+            self._reactor.callLater(seconds, d.callback, seconds)
+            res = yield d
+        defer.returnValue(res)
 
     def time(self):
         """Returns the current system time in seconds since epoch."""
-        return time.time()
+        return self._reactor.seconds()
 
     def time_msec(self):
         """Returns the current system time in miliseconds since epoch."""
@@ -56,6 +66,7 @@ class Clock(object):
             msec(float): How long to wait between calls in milliseconds.
         """
         call = task.LoopingCall(f)
+        call.clock = self._reactor
         call.start(msec / 1000.0, now=False)
         return call
 
@@ -73,7 +84,7 @@ class Clock(object):
                 callback(*args, **kwargs)
 
         with PreserveLoggingContext():
-            return reactor.callLater(delay, wrapped_callback, *args, **kwargs)
+            return self._reactor.callLater(delay, wrapped_callback, *args, **kwargs)
 
     def cancel_call_later(self, timer, ignore_errs=False):
         try: