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from __future__ import annotations
import asyncio
import random
from typing import TYPE_CHECKING
from unittest import mock
import pytest
from twisted.internet.defer import Deferred
from scrapy.utils.asyncgen import as_async_generator
from scrapy.utils.asyncio import (
AsyncioLoopingCall,
_parallel_asyncio,
is_asyncio_available,
)
from scrapy.utils.defer import deferred_f_from_coro_f
if TYPE_CHECKING:
from collections.abc import AsyncGenerator
class TestAsyncio:
def test_is_asyncio_available(self, reactor_pytest: str) -> None:
# the result should depend only on the pytest --reactor argument
assert is_asyncio_available() == (reactor_pytest == "asyncio")
@pytest.mark.only_asyncio
class TestParallelAsyncio:
"""Test for scrapy.utils.asyncio.parallel_asyncio(), based on tests.test_utils_defer.TestParallelAsync."""
CONCURRENT_ITEMS = 50
@staticmethod
async def callable(o: int, results: list[int]) -> None:
if random.random() < 0.4:
# simulate async processing
await asyncio.sleep(random.random() / 8)
# simulate trivial sync processing
results.append(o)
async def callable_wrapped(
self,
o: int,
results: list[int],
parallel_count: list[int],
max_parallel_count: list[int],
) -> None:
parallel_count[0] += 1
max_parallel_count[0] = max(max_parallel_count[0], parallel_count[0])
await self.callable(o, results)
assert parallel_count[0] > 0, parallel_count[0]
parallel_count[0] -= 1
@staticmethod
def get_async_iterable(length: int) -> AsyncGenerator[int, None]:
# simulate a simple callback without delays between results
return as_async_generator(range(length))
@staticmethod
async def get_async_iterable_with_delays(length: int) -> AsyncGenerator[int, None]:
# simulate a callback with delays between some of the results
for i in range(length):
if random.random() < 0.1:
await asyncio.sleep(random.random() / 20)
yield i
@deferred_f_from_coro_f
async def test_simple(self):
for length in [20, 50, 100]:
parallel_count = [0]
max_parallel_count = [0]
results = []
ait = self.get_async_iterable(length)
await _parallel_asyncio(
ait,
self.CONCURRENT_ITEMS,
self.callable_wrapped,
results,
parallel_count,
max_parallel_count,
)
assert list(range(length)) == sorted(results)
assert max_parallel_count[0] <= self.CONCURRENT_ITEMS
@deferred_f_from_coro_f
async def test_delays(self):
for length in [20, 50, 100]:
parallel_count = [0]
max_parallel_count = [0]
results = []
ait = self.get_async_iterable_with_delays(length)
await _parallel_asyncio(
ait,
self.CONCURRENT_ITEMS,
self.callable_wrapped,
results,
parallel_count,
max_parallel_count,
)
assert list(range(length)) == sorted(results)
assert max_parallel_count[0] <= self.CONCURRENT_ITEMS
@pytest.mark.only_asyncio
class TestAsyncioLoopingCall:
def test_looping_call(self):
func = mock.MagicMock()
looping_call = AsyncioLoopingCall(func)
looping_call.start(1, now=False)
assert looping_call.running
looping_call.stop()
assert not looping_call.running
assert not func.called
def test_looping_call_now(self):
func = mock.MagicMock()
looping_call = AsyncioLoopingCall(func)
looping_call.start(1)
looping_call.stop()
assert func.called
def test_looping_call_already_running(self):
looping_call = AsyncioLoopingCall(lambda: None)
looping_call.start(1)
with pytest.raises(RuntimeError):
looping_call.start(1)
looping_call.stop()
def test_looping_call_interval(self):
looping_call = AsyncioLoopingCall(lambda: None)
with pytest.raises(ValueError, match="Interval must be greater than 0"):
looping_call.start(0)
with pytest.raises(ValueError, match="Interval must be greater than 0"):
looping_call.start(-1)
assert not looping_call.running
def test_looping_call_bad_function(self):
looping_call = AsyncioLoopingCall(Deferred)
with pytest.raises(TypeError):
looping_call.start(0.1)
assert not looping_call.running
|
