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from __future__ import with_statement
import pytest
import time
from redis.exceptions import LockError, ResponseError
from redis.lock import Lock, LuaLock
class TestLock(object):
lock_class = Lock
def get_lock(self, redis, *args, **kwargs):
kwargs['lock_class'] = self.lock_class
return redis.lock(*args, **kwargs)
def test_lock(self, sr):
lock = self.get_lock(sr, 'foo')
assert lock.acquire(blocking=False)
assert sr.get('foo') == lock.local.token
assert sr.ttl('foo') == -1
lock.release()
assert sr.get('foo') is None
def test_competing_locks(self, sr):
lock1 = self.get_lock(sr, 'foo')
lock2 = self.get_lock(sr, '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, sr):
lock = self.get_lock(sr, 'foo', timeout=10)
assert lock.acquire(blocking=False)
assert 8 < sr.ttl('foo') <= 10
lock.release()
def test_float_timeout(self, sr):
lock = self.get_lock(sr, 'foo', timeout=9.5)
assert lock.acquire(blocking=False)
assert 8 < sr.pttl('foo') <= 9500
lock.release()
def test_blocking_timeout(self, sr):
lock1 = self.get_lock(sr, 'foo')
assert lock1.acquire(blocking=False)
lock2 = self.get_lock(sr, '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, sr):
# blocking_timeout prevents a deadlock if the lock can't be acquired
# for some reason
with self.get_lock(sr, 'foo', blocking_timeout=0.2) as lock:
assert sr.get('foo') == lock.local.token
assert sr.get('foo') is None
def test_high_sleep_raises_error(self, sr):
"If sleep is higher than timeout, it should raise an error"
with pytest.raises(LockError):
self.get_lock(sr, 'foo', timeout=1, sleep=2)
def test_releasing_unlocked_lock_raises_error(self, sr):
lock = self.get_lock(sr, 'foo')
with pytest.raises(LockError):
lock.release()
def test_releasing_lock_no_longer_owned_raises_error(self, sr):
lock = self.get_lock(sr, 'foo')
lock.acquire(blocking=False)
# manually change the token
sr.set('foo', 'a')
with pytest.raises(LockError):
lock.release()
# even though we errored, the token is still cleared
assert lock.local.token is None
def test_extend_lock(self, sr):
lock = self.get_lock(sr, 'foo', timeout=10)
assert lock.acquire(blocking=False)
assert 8000 < sr.pttl('foo') <= 10000
assert lock.extend(10)
assert 16000 < sr.pttl('foo') <= 20000
lock.release()
def test_extend_lock_float(self, sr):
lock = self.get_lock(sr, 'foo', timeout=10.0)
assert lock.acquire(blocking=False)
assert 8000 < sr.pttl('foo') <= 10000
assert lock.extend(10.0)
assert 16000 < sr.pttl('foo') <= 20000
lock.release()
def test_extending_unlocked_lock_raises_error(self, sr):
lock = self.get_lock(sr, 'foo', timeout=10)
with pytest.raises(LockError):
lock.extend(10)
def test_extending_lock_with_no_timeout_raises_error(self, sr):
lock = self.get_lock(sr, '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, sr):
lock = self.get_lock(sr, 'foo')
assert lock.acquire(blocking=False)
sr.set('foo', 'a')
with pytest.raises(LockError):
lock.extend(10)
class TestLuaLock(TestLock):
lock_class = LuaLock
class TestLockClassSelection(object):
def test_lock_class_argument(self, sr):
lock = sr.lock('foo', lock_class=Lock)
assert type(lock) == Lock
lock = sr.lock('foo', lock_class=LuaLock)
assert type(lock) == LuaLock
def test_cached_lualock_flag(self, sr):
try:
sr._use_lua_lock = True
lock = sr.lock('foo')
assert type(lock) == LuaLock
finally:
sr._use_lua_lock = None
def test_cached_lock_flag(self, sr):
try:
sr._use_lua_lock = False
lock = sr.lock('foo')
assert type(lock) == Lock
finally:
sr._use_lua_lock = None
def test_lua_compatible_server(self, sr, monkeypatch):
@classmethod
def mock_register(cls, redis):
return
monkeypatch.setattr(LuaLock, 'register_scripts', mock_register)
try:
lock = sr.lock('foo')
assert type(lock) == LuaLock
assert sr._use_lua_lock is True
finally:
sr._use_lua_lock = None
def test_lua_unavailable(self, sr, monkeypatch):
@classmethod
def mock_register(cls, redis):
raise ResponseError()
monkeypatch.setattr(LuaLock, 'register_scripts', mock_register)
try:
lock = sr.lock('foo')
assert type(lock) == Lock
assert sr._use_lua_lock is False
finally:
sr._use_lua_lock = None
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