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from __future__ import print_function
from __future__ import with_statement
import pytest
import portalocker
def test_exceptions(tmpfile):
# Open the file 2 times
a = open(tmpfile, 'a')
b = open(tmpfile, 'a')
# Lock exclusive non-blocking
lock_flags = portalocker.LOCK_EX | portalocker.LOCK_NB
# First lock file a
portalocker.lock(a, lock_flags)
# Now see if we can lock file b
with pytest.raises(portalocker.LockException):
portalocker.lock(b, lock_flags)
# Cleanup
a.close()
b.close()
def test_with_timeout(tmpfile):
# Open the file 2 times
with pytest.raises(portalocker.AlreadyLocked):
with portalocker.Lock(tmpfile, timeout=0.1) as fh:
print('writing some stuff to my cache...', file=fh)
with portalocker.Lock(tmpfile, timeout=0.1, mode='wb',
fail_when_locked=True):
pass
print('writing more stuff to my cache...', file=fh)
def test_without_timeout(tmpfile):
# Open the file 2 times
with pytest.raises(portalocker.LockException):
with portalocker.Lock(tmpfile, timeout=None) as fh:
print('writing some stuff to my cache...', file=fh)
with portalocker.Lock(tmpfile, timeout=None, mode='w'):
pass
print('writing more stuff to my cache...', file=fh)
def test_without_fail(tmpfile):
# Open the file 2 times
with pytest.raises(portalocker.LockException):
with portalocker.Lock(tmpfile, timeout=0.1) as fh:
print('writing some stuff to my cache...', file=fh)
lock = portalocker.Lock(tmpfile, timeout=0.1)
lock.acquire(check_interval=0.05, fail_when_locked=False)
def test_simple(tmpfile):
with open(tmpfile, 'w') as fh:
fh.write('spam and eggs')
fh = open(tmpfile, 'r+')
portalocker.lock(fh, portalocker.LOCK_EX)
fh.seek(13)
fh.write('foo')
# Make sure we didn't overwrite the original text
fh.seek(0)
assert fh.read(13) == 'spam and eggs'
portalocker.unlock(fh)
fh.close()
def test_truncate(tmpfile):
with open(tmpfile, 'w') as fh:
fh.write('spam and eggs')
with portalocker.Lock(tmpfile, mode='a+') as fh:
# Make sure we didn't overwrite the original text
fh.seek(0)
assert fh.read(13) == 'spam and eggs'
with portalocker.Lock(tmpfile, mode='w+') as fh:
# Make sure we truncated the file
assert fh.read() == ''
def test_class(tmpfile):
lock = portalocker.Lock(tmpfile)
lock2 = portalocker.Lock(tmpfile, fail_when_locked=False, timeout=0.01)
with lock:
lock.acquire()
with pytest.raises(portalocker.LockException):
with lock2:
pass
with lock2:
pass
def test_acquire_release(tmpfile):
lock = portalocker.Lock(tmpfile)
lock2 = portalocker.Lock(tmpfile, fail_when_locked=False)
lock.acquire() # acquire lock when nobody is using it
with pytest.raises(portalocker.LockException):
# another party should not be able to acquire the lock
lock2.acquire(timeout=0.01)
# re-acquire a held lock is a no-op
lock.acquire()
lock.release() # release the lock
lock.release() # second release does nothing
def test_rlock_acquire_release_count(tmpfile):
lock = portalocker.RLock(tmpfile)
# Twice acquire
h = lock.acquire()
assert not h.closed
lock.acquire()
assert not h.closed
# Two release
lock.release()
assert not h.closed
lock.release()
assert h.closed
def test_rlock_acquire_release(tmpfile):
lock = portalocker.RLock(tmpfile)
lock2 = portalocker.RLock(tmpfile, fail_when_locked=False)
lock.acquire() # acquire lock when nobody is using it
with pytest.raises(portalocker.LockException):
# another party should not be able to acquire the lock
lock2.acquire(timeout=0.01)
# Now acquire again
lock.acquire()
lock.release() # release the lock
lock.release() # second release does nothing
def test_release_unacquired(tmpfile):
with pytest.raises(portalocker.LockException):
portalocker.RLock(tmpfile).release()
def test_exlusive(tmpfile):
with open(tmpfile, 'w') as fh:
fh.write('spam and eggs')
fh = open(tmpfile, 'r')
portalocker.lock(fh, portalocker.LOCK_EX | portalocker.LOCK_NB)
# Make sure we can't read the locked file
with pytest.raises(portalocker.LockException):
with open(tmpfile, 'r') as fh2:
portalocker.lock(fh2, portalocker.LOCK_EX | portalocker.LOCK_NB)
fh2.read()
# Make sure we can't write the locked file
with pytest.raises(portalocker.LockException):
with open(tmpfile, 'w+') as fh2:
portalocker.lock(fh2, portalocker.LOCK_EX | portalocker.LOCK_NB)
fh2.write('surprise and fear')
# Make sure we can explicitly unlock the file
portalocker.unlock(fh)
fh.close()
def test_shared(tmpfile):
with open(tmpfile, 'w') as fh:
fh.write('spam and eggs')
f = open(tmpfile, 'r')
portalocker.lock(f, portalocker.LOCK_SH | portalocker.LOCK_NB)
# Make sure we can read the locked file
with open(tmpfile, 'r') as fh2:
portalocker.lock(fh2, portalocker.LOCK_SH | portalocker.LOCK_NB)
assert fh2.read() == 'spam and eggs'
# Make sure we can't write the locked file
with pytest.raises(portalocker.LockException):
with open(tmpfile, 'w+') as fh2:
portalocker.lock(fh2, portalocker.LOCK_EX | portalocker.LOCK_NB)
fh2.write('surprise and fear')
# Make sure we can explicitly unlock the file
portalocker.unlock(f)
f.close()
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