Fix #6844 by allowing safe (i.e. skip arg derserialization) queries v…

…ia app.inspect().active().

celery/app/control.py

@@ -135,18 +135,17 @@ def clock(self):
 
     def active(self, safe=None):
         """Return list of tasks currently executed by workers.
+        Arguments:
+            safe (Boolean): Set to True to disable deserialization.
 
         Returns:
             Dict: Dictionary ``{HOSTNAME: [TASK_INFO,...]}``.
 
         See Also:
             For ``TASK_INFO`` details see :func:`query_task` return value.
 
-        Note:
-            ``safe`` is ignored since 4.0 as no objects will need
-            serialization now that we have argsrepr/kwargsrepr.
         """
-        return self._request('active')
+        return self._request('active', safe=safe)
 
     def scheduled(self, safe=None):
         """Return list of scheduled tasks with details.

celery/worker/control.py

@@ -362,9 +362,9 @@ def reserved(state, **kwargs):
 
 
 @inspect_command(alias='dump_active')
-def active(state, **kwargs):
+def active(state, safe=False, **kwargs):
     """List of tasks currently being executed."""
-    return [request.info()
+    return [request.info(safe=safe)
             for request in state.tset(worker_state.active_requests)]
 
 

celery/worker/request.py

@@ -600,8 +600,8 @@ def info(self, safe=False):
         return {
             'id': self.id,
             'name': self.name,
-            'args': self._args,
-            'kwargs': self._kwargs,
+            'args': self._args if not safe else self._argsrepr,
+            'kwargs': self._kwargs if not safe else self._kwargsrepr,
             'type': self._type,
             'hostname': self._hostname,
             'time_start': self.time_start,

t/unit/app/test_control.py

@@ -97,6 +97,10 @@ def test_active(self):
         self.inspect.active()
         self.assert_broadcast_called('active')
 
+    def test_active_safe(self):
+        self.inspect.active(safe=True)
+        self.assert_broadcast_called('active', safe=True)
+
     def test_clock(self):
         self.inspect.clock()
         self.assert_broadcast_called('clock')

t/unit/worker/test_control.py

@@ -298,6 +298,20 @@ def test_active(self):
         finally:
             worker_state.active_requests.discard(r)
 
+    def test_active_safe(self):
+        kwargsrepr = '<anything>'
+        r = Request(
+            self.TaskMessage(self.mytask.name, id='do re mi',
+                             kwargsrepr=kwargsrepr),
+            app=self.app,
+        )
+        worker_state.active_requests.add(r)
+        try:
+            active_resp = self.panel.handle('dump_active', {'safe': True})
+            assert active_resp[0]['kwargs'] == kwargsrepr
+        finally:
+            worker_state.active_requests.discard(r)
+
     def test_pool_grow(self):
 
         class MockPool: