Automatically send GRAB_JOB after CAN_DO

After registering a function, if a connection is sleeping (ie,
waiting for a NOOP to wake it up), cause it to send another
grab_job in case the newly registered job is something it can
handle.

Change-Id: Ibea13726f4a451ebc67850b17e168bd4accfbc0b

gear/__init__.py

@@ -1897,6 +1897,12 @@ class Worker(BaseClient):
         else:
             self._sendCanDo(name)
 
+        connections = self.active_connections[:]
+        for connection in connections:
+            if connection.state == "SLEEP":
+                connection.changeState("IDLE")
+        self._updateStateMachines()
+
     def unRegisterFunction(self, name):
         """Remove a function from Gearman's registry.
 

gear/tests/test_functional.py

@@ -238,6 +238,36 @@ class TestFunctionalText(tests.BaseTestCase):
             self.assertTrue(job.complete)
             self.assertEqual(job.exception, 'work failed')
 
+    def test_grab_job_after_register(self):
+        jobunique = uuid.uuid4().hex
+        job = gear.TextJob('test', 'testdata', unique=jobunique)
+        self.client.submitJob(job)
+        self.assertNotEqual(job.handle, None)
+
+        def getJob():
+            workerjob = self.worker.getJob()
+            workerjob.sendWorkComplete()
+
+        jobthread = threading.Thread(target=getJob)
+        jobthread.daemon = True
+        jobthread.start()
+
+        for count in iterate_timeout(30, "worker sleeping"):
+            if self.worker.active_connections[0].state == 'SLEEP':
+                break
+        self.assertEqual(1, len(self.server.normal_queue))
+        self.assertFalse(job.complete)
+
+        # When we register the function, the worker should send a
+        # grab_job packet and pick up the job and it should complete.
+        self.worker.registerFunction('test')
+
+        for count in iterate_timeout(30, "job completion"):
+            if job.complete:
+                break
+
+        self.assertEqual(0, len(self.server.normal_queue))
+
 
 def load_tests(loader, in_tests, pattern):
     return testscenarios.load_tests_apply_scenarios(loader, in_tests, pattern)