100% Coverage for celery.worker.hub

celery/tests/worker/test_hub.py

@@ -0,0 +1,263 @@
+from __future__ import absolute_import
+from __future__ import with_statement
+
+from celery.worker.hub import (
+    DummyLock,
+    BoundedSemaphore,
+    Hub,
+)
+
+from mock import Mock, call, patch
+
+from celery.tests.utils import Case
+
+
+class File(object):
+
+    def __init__(self, fd):
+        self.fd = fd
+
+    def fileno(self):
+        return self.fd
+
+    def __eq__(self, other):
+        if isinstance(other, File):
+            return self.fd == other.fd
+        return NotImplemented
+
+
+class test_DummyLock(Case):
+
+    def test_context(self):
+        mutex = DummyLock()
+        with mutex:
+            pass
+
+
+class test_BoundedSemaphore(Case):
+
+    def test_acquire_release(self):
+        x = BoundedSemaphore(2)
+
+        c1 = Mock()
+        x.acquire(c1, 1);
+        self.assertEqual(x.value, 1)
+        c1.assert_called_with(1)
+
+        c2 = Mock()
+        x.acquire(c2, 2)
+        self.assertEqual(x.value, 0)
+        c2.assert_called_with(2)
+
+        c3 = Mock()
+        x.acquire(c3, 3)
+        self.assertEqual(x.value, 0)
+        self.assertFalse(c3.called)
+
+        x.release()
+        self.assertEqual(x.value, 1)
+        c3.assert_called_with(3)
+
+    def test_bounded(self):
+        x = BoundedSemaphore(2)
+        for i in xrange(100):
+            x.release()
+        self.assertEqual(x.value, 2)
+
+    def test_grow_shrink(self):
+        x = BoundedSemaphore(1)
+        self.assertEqual(x.initial_value, 1)
+        cb1 = Mock()
+        x.acquire(cb1, 1)
+        cb1.assert_called_with(1)
+        self.assertEqual(x.value, 0)
+
+        cb2 = Mock()
+        x.acquire(cb2, 2)
+        self.assertFalse(cb2.called)
+        self.assertEqual(x.value, 0)
+
+        cb3 = Mock()
+        x.acquire(cb3, 3)
+        self.assertFalse(cb3.called)
+
+        x.grow(2)
+        cb2.assert_called_with(2)
+        cb3.assert_called_with(3)
+        self.assertEqual(x.value, 3)
+        self.assertEqual(x.initial_value, 3)
+
+        self.assertFalse(x._waiting)
+        x.grow(3)
+        for i in xrange(x.initial_value):
+            self.assertTrue(x.acquire(Mock()))
+        self.assertFalse(x.acquire(Mock()))
+        x.clear()
+
+        x.shrink(3)
+        for i in xrange(x.initial_value):
+            self.assertTrue(x.acquire(Mock()))
+        self.assertFalse(x.acquire(Mock()))
+        self.assertEqual(x.value, 0)
+
+        for i in xrange(100):
+            x.release()
+        self.assertEqual(x.value, x.initial_value)
+
+    def test_clear(self):
+        x = BoundedSemaphore(10)
+        for i in xrange(11):
+            x.acquire(Mock())
+        self.assertTrue(x._waiting)
+        self.assertEqual(x.value, 0)
+
+        x.clear()
+        self.assertFalse(x._waiting)
+        self.assertEqual(x.value, x.initial_value)
+
+
+class test_Hub(Case):
+
+    @patch("kombu.utils.eventio.poll")
+    def test_start_stop(self, poll):
+        hub = Hub()
+        hub.start()
+        poll.assert_called_with()
+
+        hub.stop()
+        hub.poller.close.assert_called_with()
+
+    def test_init(self):
+        hub = Hub()
+        cb1 = Mock()
+        cb2 = Mock()
+        hub.on_init.extend([cb1, cb2])
+
+        hub.init()
+        cb1.assert_called_with(hub)
+        cb2.assert_called_with(hub)
+
+    def test_fire_timers(self):
+        hub = Hub()
+        hub.timer = Mock()
+        hub.timer._queue = []
+        self.assertEqual(hub.fire_timers(min_delay=42.324,
+                                         max_delay=32.321), 32.321)
+
+        hub.timer._queue = [1]
+        hub.scheduler = Mock()
+        hub.scheduler.next.return_value = 3.743, None
+        self.assertEqual(hub.fire_timers(), 3.743)
+
+        e1, e2, e3 = Mock(), Mock(), Mock()
+        entries = [e1, e2, e3]
+        def se():
+            if entries:
+                return None, entries.pop()
+            return 3.982, None
+        hub.scheduler.next = Mock()
+        hub.scheduler.next.side_effect = se
+
+        self.assertEqual(hub.fire_timers(max_timers=10), 3.982)
+        hub.timer.apply_entry.assert_has_calls(map(call, [e3, e2, e1]))
+
+        entries[:] = [Mock() for _ in xrange(11)]
+        keep = list(entries)
+        self.assertEqual(hub.fire_timers(max_timers=10, min_delay=1.13), 1.13)
+        hub.timer.apply_entry.assert_has_calls(map(call,
+            reversed(keep[1:])))
+        self.assertEqual(hub.fire_timers(max_timers=10), 3.982)
+        hub.timer.apply_entry.assert_has_calls(call(keep[0]))
+
+    def test_update_readers(self):
+        hub = Hub()
+        P = hub.poller = Mock()
+
+        read_A = Mock()
+        read_B = Mock()
+        hub.update_readers({10: read_A, File(11): read_B})
+
+        P.register.assert_has_calls([
+            call(10, hub.READ | hub.ERR),
+            call(File(11), hub.READ | hub.ERR),
+        ], any_order=True)
+
+        self.assertIs(hub.readers[10], read_A)
+        self.assertIs(hub.readers[11], read_B)
+
+        hub.remove(10)
+        self.assertNotIn(10, hub.readers)
+        hub.remove(File(11))
+        self.assertNotIn(11, hub.readers)
+        P.unregister.assert_has_calls([
+            call(10), call(File(11)),
+        ])
+
+    def test_can_remove_unknown_fds(self):
+        hub = Hub()
+        hub.poller = Mock()
+        hub.remove(30)
+        hub.remove(File(301))
+
+    def test_remove__unregister_raises(self):
+        hub = Hub()
+        hub.poller = Mock()
+        hub.poller.unregister.side_effect = OSError()
+
+        hub.remove(313)
+
+    def test_update_writers(self):
+        hub = Hub()
+        P = hub.poller = Mock()
+
+        write_A = Mock()
+        write_B = Mock()
+        hub.update_writers({20: write_A, File(21): write_B})
+
+        P.register.assert_has_calls([
+            call(20, hub.WRITE),
+            call(File(21), hub.WRITE),
+        ], any_order=True)
+
+        self.assertIs(hub.writers[20], write_A)
+        self.assertIs(hub.writers[21], write_B)
+
+        hub.remove(20)
+        self.assertNotIn(20, hub.writers)
+        hub.remove(File(21))
+        self.assertNotIn(21, hub.writers)
+        P.unregister.assert_has_calls([
+            call(20), call(File(21)),
+        ])
+
+    def test_enter__exit(self):
+        hub = Hub()
+        P = hub.poller = Mock()
+        hub.init = Mock()
+
+        on_close = Mock()
+        hub.on_close.append(on_close)
+
+        with hub:
+            hub.init.assert_called_with()
+
+            read_A = Mock()
+            read_B = Mock()
+            hub.update_readers({10: read_A, File(11): read_B})
+            write_A = Mock()
+            write_B = Mock()
+            hub.update_writers({20: write_A, File(21): write_B})
+            self.assertTrue(hub.readers)
+            self.assertTrue(hub.writers)
+        self.assertFalse(hub.readers)
+        self.assertFalse(hub.writers)
+
+        P.unregister.assert_has_calls([
+            call(10), call(11), call(20), call(21),
+        ], any_order=True)
+
+        on_close.assert_called_with(hub)
+
+    def test_scheduler_property(self):
+        hub = Hub(timer=[1, 2, 3])
+        self.assertEqual(list(hub.scheduler), [1, 2, 3])