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from pymodbus.compat import IS_PYTHON3
if IS_PYTHON3:
import functools
def _yielded_return(return_value, *args):
"""Generator factory function with return value."""
def _():
"""Actual generator producing value."""
yield
return return_value
# return new generator each time this function is called:
return _()
def return_as_coroutine(return_value=None):
"""Creates a function that behaves like an asyncio coroutine and returns the given value.
Typically used as a side effect of a mocked coroutine like this:
# in module mymod:
@asyncio.coroutine
def my_coro_under_test():
yield from asyncio.sleep(1)
yield from asyncio.sleep(2)
return 42
# in test module:
@mock.patch('mymod.asyncio.sleep')
def test_it(mock_sleep):
mock_sleep.side_effect = return_as_coroutine()
result = run_coroutine(my_coro_under_test)
assert mock_sleep.call_count == 2
assert mock_sleep.call_args_list == [mock.call(1), mock.call(2)]
assert result == 42
"""
return functools.partial(_yielded_return, return_value)
def run_coroutine(coro):
"""Runs a coroutine as top-level task by iterating through all yielded steps."""
result = None
try:
# step through all parts of coro without scheduling anything else:
while True:
result = coro.send(result)
except StopIteration as ex:
# coro reached end pass on its return value:
return ex.value
except:
raise
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