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import pytest
import time
from redis.exceptions import LockError, LockNotOwnedError
from redis.client import Redis
from redis.lock import Lock
from .conftest import _get_client
class TestLock(object):
@pytest.fixture()
def r_decoded(self, request):
return _get_client(Redis, request=request, decode_responses=True)
def get_lock(self, redis, *args, **kwargs):
kwargs['lock_class'] = Lock
return redis.lock(*args, **kwargs)
def test_lock(self, r):
lock = self.get_lock(r, 'foo')
assert lock.acquire(blocking=False)
assert r.get('foo') == lock.local.token
assert r.ttl('foo') == -1
lock.release()
assert r.get('foo') is None
def test_lock_token(self, r):
lock = self.get_lock(r, 'foo')
assert lock.acquire(blocking=False, token='test')
assert r.get('foo') == b'test'
assert lock.local.token == b'test'
assert r.ttl('foo') == -1
lock.release()
assert r.get('foo') is None
assert lock.local.token is None
def test_locked(self, r):
lock = self.get_lock(r, 'foo')
assert lock.locked() is False
lock.acquire(blocking=False)
assert lock.locked() is True
lock.release()
assert lock.locked() is False
def _test_owned(self, client):
lock = self.get_lock(client, 'foo')
assert lock.owned() is False
lock.acquire(blocking=False)
assert lock.owned() is True
lock.release()
assert lock.owned() is False
lock2 = self.get_lock(client, 'foo')
assert lock.owned() is False
assert lock2.owned() is False
lock2.acquire(blocking=False)
assert lock.owned() is False
assert lock2.owned() is True
lock2.release()
assert lock.owned() is False
assert lock2.owned() is False
def test_owned(self, r):
self._test_owned(r)
def test_owned_with_decoded_responses(self, r_decoded):
self._test_owned(r_decoded)
def test_competing_locks(self, r):
lock1 = self.get_lock(r, 'foo')
lock2 = self.get_lock(r, 'foo')
assert lock1.acquire(blocking=False)
assert not lock2.acquire(blocking=False)
lock1.release()
assert lock2.acquire(blocking=False)
assert not lock1.acquire(blocking=False)
lock2.release()
def test_timeout(self, r):
lock = self.get_lock(r, 'foo', timeout=10)
assert lock.acquire(blocking=False)
assert 8 < r.ttl('foo') <= 10
lock.release()
def test_float_timeout(self, r):
lock = self.get_lock(r, 'foo', timeout=9.5)
assert lock.acquire(blocking=False)
assert 8 < r.pttl('foo') <= 9500
lock.release()
def test_blocking_timeout(self, r):
lock1 = self.get_lock(r, 'foo')
assert lock1.acquire(blocking=False)
lock2 = self.get_lock(r, 'foo', blocking_timeout=0.2)
start = time.time()
assert not lock2.acquire()
assert (time.time() - start) > 0.2
lock1.release()
def test_context_manager(self, r):
# blocking_timeout prevents a deadlock if the lock can't be acquired
# for some reason
with self.get_lock(r, 'foo', blocking_timeout=0.2) as lock:
assert r.get('foo') == lock.local.token
assert r.get('foo') is None
def test_context_manager_raises_when_locked_not_acquired(self, r):
r.set('foo', 'bar')
with pytest.raises(LockError):
with self.get_lock(r, 'foo', blocking_timeout=0.1):
pass
def test_high_sleep_raises_error(self, r):
"If sleep is higher than timeout, it should raise an error"
with pytest.raises(LockError):
self.get_lock(r, 'foo', timeout=1, sleep=2)
def test_releasing_unlocked_lock_raises_error(self, r):
lock = self.get_lock(r, 'foo')
with pytest.raises(LockError):
lock.release()
def test_releasing_lock_no_longer_owned_raises_error(self, r):
lock = self.get_lock(r, 'foo')
lock.acquire(blocking=False)
# manually change the token
r.set('foo', 'a')
with pytest.raises(LockNotOwnedError):
lock.release()
# even though we errored, the token is still cleared
assert lock.local.token is None
def test_extend_lock(self, r):
lock = self.get_lock(r, 'foo', timeout=10)
assert lock.acquire(blocking=False)
assert 8000 < r.pttl('foo') <= 10000
assert lock.extend(10)
assert 16000 < r.pttl('foo') <= 20000
lock.release()
def test_extend_lock_float(self, r):
lock = self.get_lock(r, 'foo', timeout=10.0)
assert lock.acquire(blocking=False)
assert 8000 < r.pttl('foo') <= 10000
assert lock.extend(10.0)
assert 16000 < r.pttl('foo') <= 20000
lock.release()
def test_extending_unlocked_lock_raises_error(self, r):
lock = self.get_lock(r, 'foo', timeout=10)
with pytest.raises(LockError):
lock.extend(10)
def test_extending_lock_with_no_timeout_raises_error(self, r):
lock = self.get_lock(r, 'foo')
assert lock.acquire(blocking=False)
with pytest.raises(LockError):
lock.extend(10)
lock.release()
def test_extending_lock_no_longer_owned_raises_error(self, r):
lock = self.get_lock(r, 'foo', timeout=10)
assert lock.acquire(blocking=False)
r.set('foo', 'a')
with pytest.raises(LockNotOwnedError):
lock.extend(10)
def test_reacquire_lock(self, r):
lock = self.get_lock(r, 'foo', timeout=10)
assert lock.acquire(blocking=False)
assert r.pexpire('foo', 5000)
assert r.pttl('foo') <= 5000
assert lock.reacquire()
assert 8000 < r.pttl('foo') <= 10000
lock.release()
def test_reacquiring_unlocked_lock_raises_error(self, r):
lock = self.get_lock(r, 'foo', timeout=10)
with pytest.raises(LockError):
lock.reacquire()
def test_reacquiring_lock_with_no_timeout_raises_error(self, r):
lock = self.get_lock(r, 'foo')
assert lock.acquire(blocking=False)
with pytest.raises(LockError):
lock.reacquire()
lock.release()
def test_reacquiring_lock_no_longer_owned_raises_error(self, r):
lock = self.get_lock(r, 'foo', timeout=10)
assert lock.acquire(blocking=False)
r.set('foo', 'a')
with pytest.raises(LockNotOwnedError):
lock.reacquire()
class TestLockClassSelection(object):
def test_lock_class_argument(self, r):
class MyLock(object):
def __init__(self, *args, **kwargs):
pass
lock = r.lock('foo', lock_class=MyLock)
assert type(lock) == MyLock
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