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#!/usr/bin/env python3
"""Fuzz tester for as_completed(), by Glenn Langford."""
import asyncio
import itertools
import random
import sys
@asyncio.coroutine
def sleeper(time):
yield from asyncio.sleep(time)
return time
@asyncio.coroutine
def watcher(tasks,delay=False):
res = []
for t in asyncio.as_completed(tasks):
r = yield from t
res.append(r)
if delay:
# simulate processing delay
process_time = random.random() / 10
yield from asyncio.sleep(process_time)
#print(res)
#assert(sorted(res) == res)
if sorted(res) != res:
print('FAIL', res)
print('------------')
else:
print('.', end='')
sys.stdout.flush()
loop = asyncio.get_event_loop()
print('Pass 1')
# All permutations of discrete task running times must be returned
# by as_completed in the correct order.
task_times = [0, 0.1, 0.2, 0.3, 0.4 ] # 120 permutations
for times in itertools.permutations(task_times):
tasks = [ asyncio.Task(sleeper(t)) for t in times ]
loop.run_until_complete(asyncio.Task(watcher(tasks)))
print()
print('Pass 2')
# Longer task times, with randomized duplicates. 100 tasks each time.
longer_task_times = [x/10 for x in range(30)]
for i in range(20):
task_times = longer_task_times * 10
random.shuffle(task_times)
#print('Times', task_times[:500])
tasks = [ asyncio.Task(sleeper(t)) for t in task_times[:100] ]
loop.run_until_complete(asyncio.Task(watcher(tasks)))
print()
print('Pass 3')
# Same as pass 2, but with a random processing delay (0 - 0.1s) after
# retrieving each future from as_completed and 200 tasks. This tests whether
# the order that callbacks are triggered is preserved through to the
# as_completed caller.
for i in range(20):
task_times = longer_task_times * 10
random.shuffle(task_times)
#print('Times', task_times[:200])
tasks = [ asyncio.Task(sleeper(t)) for t in task_times[:200] ]
loop.run_until_complete(asyncio.Task(watcher(tasks, delay=True)))
print()
loop.close()
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