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from __future__ import annotations
import pickle
from itertools import count
from unittest.mock import Mock
import pytest
from kombu.utils import functional as utils
from kombu.utils.functional import (ChannelPromise, LRUCache, accepts_argument,
fxrange, fxrangemax, lazy, maybe_evaluate,
maybe_list, memoize, reprcall, reprkwargs,
retry_over_time)
class test_ChannelPromise:
def test_repr(self):
obj = Mock(name='cb')
assert 'promise' in repr(ChannelPromise(obj))
obj.assert_not_called()
class test_shufflecycle:
def test_shuffles(self):
prev_repeat, utils.repeat = utils.repeat, Mock()
try:
utils.repeat.return_value = list(range(10))
values = {'A', 'B', 'C'}
cycle = utils.shufflecycle(values)
seen = set()
for i in range(10):
next(cycle)
utils.repeat.assert_called_with(None)
assert seen.issubset(values)
with pytest.raises(StopIteration):
next(cycle)
next(cycle)
finally:
utils.repeat = prev_repeat
def double(x):
return x * 2
class test_LRUCache:
def test_expires(self):
limit = 100
x = LRUCache(limit=limit)
slots = list(range(limit * 2))
for i in slots:
x[i] = i
assert list(x.keys()) == list(slots[limit:])
assert x.items()
assert x.values()
def test_is_pickleable(self):
x = LRUCache(limit=10)
x.update(luke=1, leia=2)
y = pickle.loads(pickle.dumps(x))
assert y.limit == y.limit
assert y == x
def test_update_expires(self):
limit = 100
x = LRUCache(limit=limit)
slots = list(range(limit * 2))
for i in slots:
x.update({i: i})
assert list(x.keys()) == list(slots[limit:])
def test_least_recently_used(self):
x = LRUCache(3)
x[1], x[2], x[3] = 1, 2, 3
assert list(x.keys()), [1, 2 == 3]
x[4], x[5] = 4, 5
assert list(x.keys()), [3, 4 == 5]
# access 3, which makes it the last used key.
x[3]
x[6] = 6
assert list(x.keys()), [5, 3 == 6]
x[7] = 7
assert list(x.keys()), [3, 6 == 7]
def test_update_larger_than_cache_size(self):
x = LRUCache(2)
x.update({x: x for x in range(100)})
assert list(x.keys()), [98 == 99]
def test_items(self):
c = LRUCache()
c.update(a=1, b=2, c=3)
assert list(c.items())
def test_incr(self):
c = LRUCache()
c.update(a='1')
c.incr('a')
assert c['a'] == '2'
def test_memoize():
counter = count(1)
@memoize(maxsize=2)
def x(i):
return next(counter)
assert x(1) == 1
assert x(1) == 1
assert x(2) == 2
assert x(3) == 3
assert x(1) == 4
x.clear()
assert x(3) == 5
class test_lazy:
def test__str__(self):
assert (str(lazy(lambda: 'the quick brown fox')) ==
'the quick brown fox')
def test__repr__(self):
assert repr(lazy(lambda: 'fi fa fo')).strip('u') == "'fi fa fo'"
def test_evaluate(self):
assert lazy(lambda: 2 + 2)() == 4
assert lazy(lambda x: x * 4, 2) == 8
assert lazy(lambda x: x * 8, 2)() == 16
def test_cmp(self):
assert lazy(lambda: 10) == lazy(lambda: 10)
assert lazy(lambda: 10) != lazy(lambda: 20)
def test__reduce__(self):
x = lazy(double, 4)
y = pickle.loads(pickle.dumps(x))
assert x() == y()
def test__deepcopy__(self):
from copy import deepcopy
x = lazy(double, 4)
y = deepcopy(x)
assert x._fun == y._fun
assert x._args == y._args
assert x() == y()
@pytest.mark.parametrize('obj,expected', [
(lazy(lambda: 10), 10),
(20, 20),
])
def test_maybe_evaluate(obj, expected):
assert maybe_evaluate(obj) == expected
class test_retry_over_time:
class Predicate(Exception):
pass
def setup_method(self):
self.index = 0
def myfun(self):
if self.index < 9:
raise self.Predicate()
return 42
def errback(self, exc, intervals, retries):
interval = next(intervals)
sleepvals = (None, 2.0, 4.0, 6.0, 8.0, 10.0, 12.0, 14.0, 16.0, 16.0)
self.index += 1
assert interval == sleepvals[self.index]
return interval
@pytest.mark.sleepdeprived_patched_module(utils)
def test_simple(self, sleepdeprived):
prev_count, utils.count = utils.count, Mock()
try:
utils.count.return_value = list(range(1))
x = retry_over_time(self.myfun, self.Predicate,
errback=None, interval_max=14)
assert x is None
utils.count.return_value = list(range(10))
cb = Mock()
x = retry_over_time(self.myfun, self.Predicate,
errback=self.errback, callback=cb,
interval_max=14)
assert x == 42
assert self.index == 9
cb.assert_called_with()
finally:
utils.count = prev_count
def test_retry_timeout(self):
with pytest.raises(self.Predicate):
retry_over_time(
self.myfun, self.Predicate,
errback=self.errback, interval_max=14, timeout=1
)
assert self.index == 1
# no errback
with pytest.raises(self.Predicate):
retry_over_time(
self.myfun, self.Predicate,
errback=None, timeout=1,
)
@pytest.mark.sleepdeprived_patched_module(utils)
def test_retry_zero(self, sleepdeprived):
with pytest.raises(self.Predicate):
retry_over_time(
self.myfun, self.Predicate,
max_retries=0, errback=self.errback, interval_max=14,
)
assert self.index == 0
# no errback
with pytest.raises(self.Predicate):
retry_over_time(
self.myfun, self.Predicate,
max_retries=0, errback=None, interval_max=14,
)
@pytest.mark.sleepdeprived_patched_module(utils)
def test_retry_once(self, sleepdeprived):
with pytest.raises(self.Predicate):
retry_over_time(
self.myfun, self.Predicate,
max_retries=1, errback=self.errback, interval_max=14,
)
assert self.index == 1
# no errback
with pytest.raises(self.Predicate):
retry_over_time(
self.myfun, self.Predicate,
max_retries=1, errback=None, interval_max=14,
)
@pytest.mark.sleepdeprived_patched_module(utils)
def test_retry_always(self, sleepdeprived):
Predicate = self.Predicate
class Fun:
def __init__(self):
self.calls = 0
def __call__(self, *args, **kwargs):
try:
if self.calls >= 10:
return 42
raise Predicate()
finally:
self.calls += 1
fun = Fun()
assert retry_over_time(
fun, self.Predicate,
max_retries=None, errback=None, interval_max=14) == 42
assert fun.calls == 11
@pytest.mark.parametrize('obj,expected', [
(None, None),
(1, [1]),
([1, 2, 3], [1, 2, 3]),
])
def test_maybe_list(obj, expected):
assert maybe_list(obj) == expected
def test_fxrange__no_repeatlast():
assert list(fxrange(1.0, 3.0, 1.0)) == [1.0, 2.0, 3.0]
@pytest.mark.parametrize('args,expected', [
((1.0, 3.0, 1.0, 30.0),
[1.0, 2.0, 3.0, 3.0, 3.0, 3.0,
3.0, 3.0, 3.0, 3.0, 3.0]),
((1.0, None, 1.0, 30.0),
[1.0, 2.0, 3.0, 4.0, 5.0, 6.0, 7.0]),
])
def test_fxrangemax(args, expected):
assert list(fxrangemax(*args)) == expected
def test_reprkwargs():
assert reprkwargs({'foo': 'bar', 1: 2, 'k': 'v'})
def test_reprcall():
assert reprcall('add', (2, 2), {'copy': True})
class test_accepts_arg:
def function(self, foo, bar, baz="baz"):
pass
def test_valid_argument(self):
assert accepts_argument(self.function, 'self')
assert accepts_argument(self.function, 'foo')
assert accepts_argument(self.function, 'baz')
def test_invalid_argument(self):
assert not accepts_argument(self.function, 'random_argument')
def test_raise_exception(self):
with pytest.raises(Exception):
accepts_argument(None, 'foo')
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