def test_stashing_router_can_stash_messages():
stash_count = 3
calls = []
def handler(msg):
nonlocal stash_count
calls.append(msg)
if stash_count > 0:
stash_count -= 1
return STASH, "reason"
else:
return None, None
bus = InternalBus()
router = StashingRouter(10, buses=[bus])
router.subscribe(SomeMessage, handler)
msg_a = create_some_message()
msg_b = create_some_message()
bus.send(msg_a)
bus.send(msg_b)
assert router.stash_size() == 2
assert calls == [msg_a, msg_b]
router.process_all_stashed()
assert router.stash_size() == 1
assert calls == [msg_a, msg_b, msg_a, msg_b]
router.process_all_stashed()
assert router.stash_size() == 0
assert calls == [msg_a, msg_b, msg_a, msg_b, msg_a]
router.process_all_stashed()
assert router.stash_size() == 0
assert calls == [msg_a, msg_b, msg_a, msg_b, msg_a]
def test_stashing_router_can_stash_messages_with_metadata():
stash_count = 3
calls = []
def handler(msg, frm):
nonlocal stash_count
calls.append((msg, frm))
if stash_count > 0:
stash_count -= 1
return STASH
bus = InternalBus()
router = StashingRouter(10)
router.subscribe(SomeMessage, handler)
router.subscribe_to(bus)
msg_a = create_some_message()
msg_b = create_some_message()
bus.send(msg_a, 'A')
bus.send(msg_b, 'B')
assert router.stash_size() == 2
assert calls == [(msg_a, 'A'), (msg_b, 'B')]
router.process_all_stashed()
assert router.stash_size() == 1
assert calls == [(msg_a, 'A'), (msg_b, 'B'), (msg_a, 'A'), (msg_b, 'B')]
router.process_all_stashed()
assert router.stash_size() == 0
assert calls == [(msg_a, 'A'), (msg_b, 'B'), (msg_a, 'A'), (msg_b, 'B'), (msg_a, 'A')]
router.process_all_stashed()
assert router.stash_size() == 0
assert calls == [(msg_a, 'A'), (msg_b, 'B'), (msg_a, 'A'), (msg_b, 'B'), (msg_a, 'A')]
def test_stashing_router_can_process_stashed_until_first_restash():
calls = []
def handler(msg):
calls.append(msg)
if len(calls) % 2 != 0:
return STASH, "reason"
else:
return None, None
bus = InternalBus()
router = StashingRouter(10, buses=[bus])
router.subscribe(SomeMessage, handler)
msg_a = create_some_message()
msg_b = create_some_message()
msg_c = create_some_message()
msg_d = create_some_message()
msg_e = create_some_message()
bus.send(msg_a)
bus.send(msg_b)
bus.send(msg_c)
bus.send(msg_d)
bus.send(msg_e)
assert router.stash_size() == 3
assert calls == [msg_a, msg_b, msg_c, msg_d, msg_e]
# Stash contains A, C, E, going to stop on C
router.process_stashed_until_first_restash()
assert router.stash_size() == 2
assert calls == [msg_a, msg_b, msg_c, msg_d, msg_e, msg_a, msg_c]
# Stash contains E, C, going to stop on C
router.process_stashed_until_first_restash()
assert router.stash_size() == 1
assert calls == [
msg_a, msg_b, msg_c, msg_d, msg_e, msg_a, msg_c, msg_e, msg_c
]
# Stash contains C, not going to stop
router.process_stashed_until_first_restash()
assert router.stash_size() == 0
assert calls == [
msg_a, msg_b, msg_c, msg_d, msg_e, msg_a, msg_c, msg_e, msg_c, msg_c
]
# Stash doesn't contain anything
router.process_stashed_until_first_restash()
assert router.stash_size() == 0
assert calls == [
msg_a, msg_b, msg_c, msg_d, msg_e, msg_a, msg_c, msg_e, msg_c, msg_c
]
def test_stashing_router_can_stash_messages_with_different_reasons():
calls = []
def handler(message: SomeMessage):
calls.append(message)
if message.int_field % 2 == 0:
return STASH + 0, "reason"
else:
return STASH + 1, "reason"
bus = InternalBus()
router = StashingRouter(10, buses=[bus])
router.subscribe(SomeMessage, handler)
messages = [create_some_message() for _ in range(10)]
for msg in messages:
bus.send(msg)
assert router.stash_size() == len(messages)
assert router.stash_size(STASH +
0) + router.stash_size(STASH +
1) == router.stash_size()
calls.clear()
router.process_all_stashed()
assert router.stash_size() == len(messages)
assert calls == sorted(messages, key=lambda m: m.int_field % 2)
calls.clear()
router.process_all_stashed(STASH + 0)
assert router.stash_size() == len(messages)
assert router.stash_size(STASH + 0) == len(calls)
assert all(msg.int_field % 2 == 0 for msg in calls)
assert all(msg in messages for msg in calls)
calls.clear()
router.process_all_stashed(STASH + 1)
assert router.stash_size() == len(messages)
assert router.stash_size(STASH + 1) == len(calls)
assert all(msg.int_field % 2 != 0 for msg in calls)
assert all(msg in messages for msg in calls)