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# Copyright 2016 Facundo Batista, Nicolás Demarchi
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General
# Public License version 3, as published by the Free Software Foundation.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranties of
# MERCHANTABILITY, SATISFACTORY QUALITY, or FITNESS FOR A PARTICULAR PURPOSE.
# See the GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.
# If not, see <http://www.gnu.org/licenses/>.
#
# For further info, check https://github.com/PyAr/fades
"""Tests for the helpers in multiplatform."""
import os
import threading
import time
import unittest
from fades.multiplatform import filelock
class LockChecker(threading.Thread):
"""Helper to check the lock in other thread.
The time.sleep() in the middle of the process is for time.time()
granularity in different platforms to not mess our tests.
"""
def __init__(self, filepath):
self.filepath = filepath
self.in_lock = self.post_work = None
self.middle_work = threading.Event()
super().__init__()
def run(self):
with filelock(self.filepath):
time.sleep(.01)
self.in_lock = time.time()
self.middle_work.wait()
self.post_work = time.time()
class LockCacheTestCase(unittest.TestCase):
"""Tests for the locking utility."""
def setUp(self):
self.test_path = "test_filelock"
def tearDown(self):
if os.path.exists(self.test_path):
os.remove(self.test_path)
def wait(self, lock_checker, attr_name):
"""Wait at most a second for the LockChecker to end."""
for i in range(10):
attr = getattr(lock_checker, attr_name)
if attr is not None:
# ended!
return
time.sleep(.3)
self.fail("LC didnt end: %s" % (lock_checker,))
def test_lock_alone(self):
lc = LockChecker(self.test_path)
lc.start()
lc.middle_work.set()
self.wait(lc, 'post_work')
def test_lock_intermixed(self):
lc1 = LockChecker(self.test_path)
lc1.start()
self.wait(lc1, 'in_lock')
lc2 = LockChecker(self.test_path)
lc2.start()
lc1.middle_work.set()
self.wait(lc1, 'post_work')
lc2.middle_work.set()
self.wait(lc2, 'post_work')
# check LC 2 waited to enter
self.assertGreater(lc2.in_lock, lc1.post_work)
def test_lock_exploding(self):
# get the lock and explode in the middle (then ignore the blast)
try:
with filelock(self.test_path):
raise ValueError("pumba")
except ValueError:
pass
# get the lock again
with filelock(self.test_path):
pass
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