Python redis.exceptions.LockError() Examples

def do_release(self, expected_token):
        if not bool(self.lua_release(keys=[self.name],
                                     args=[expected_token],
                                     client=self.redis)):
            raise LockError("Cannot release a lock that's no longer owned") 

def do_extend(self, additional_time):
        pipe = self.redis.pipeline()
        pipe.watch(self.name)
        lock_value = pipe.get(self.name)
        if lock_value != self.local.token:
            raise LockError("Cannot extend a lock that's no longer owned")
        expiration = pipe.pttl(self.name)
        if expiration is None or expiration < 0:
            # Redis evicted the lock key between the previous get() and now
            # we'll handle this when we call pexpire()
            expiration = 0
        pipe.multi()
        pipe.pexpire(self.name, expiration + int(additional_time * 1000))

        try:
            response = pipe.execute()
        except WatchError:
            # someone else acquired the lock
            raise LockError("Cannot extend a lock that's no longer owned")
        if not response[0]:
            # pexpire returns False if the key doesn't exist
            raise LockError("Cannot extend a lock that's no longer owned")
        return True 

def test_sync_parallel(alter_xmlrpc):
    alter_xmlrpc([dict(name='packageD', summary='Test package.', version='3.0.0'), ])
    redis.delete(POLL_SIMPLE_THROTTLE)

    redis_key = CELERY_LOCK.format(task_name='pypi_portal.tasks.pypi.update_package_list')
    lock = redis.lock(redis_key, timeout=1)
    assert lock.acquire(blocking=False)

    assert '302 FOUND' == current_app.test_client().get('/pypi/sync').status

    expected = [('packageB', 'Test package.', '3.0.0'), ]
    actual = db.session.query(Package.name, Package.summary, Package.latest_version).all()
    assert expected == actual

    try:
        lock.release()
    except LockError:
        pass 

def do_extend(self, additional_time):
        pipe = self.redis.pipeline()
        pipe.watch(self.name)
        lock_value = pipe.get(self.name)
        if lock_value != self.local.token:
            raise LockError("Cannot extend a lock that's no longer owned")
        expiration = pipe.pttl(self.name)
        if expiration is None or expiration < 0:
            # Redis evicted the lock key between the previous get() and now
            # we'll handle this when we call pexpire()
            expiration = 0
        pipe.multi()
        pipe.pexpire(self.name, expiration + int(additional_time * 1000))

        try:
            response = pipe.execute()
        except WatchError:
            # someone else acquired the lock
            raise LockError("Cannot extend a lock that's no longer owned")
        if not response[0]:
            # pexpire returns False if the key doesn't exist
            raise LockError("Cannot extend a lock that's no longer owned")
        return True 

def do_extend(self, additional_time):
        pipe = self.redis.pipeline()
        pipe.watch(self.name)
        lock_value = pipe.get(self.name)
        if lock_value != self.local.token:
            raise LockError("Cannot extend a lock that's no longer owned")
        expiration = pipe.pttl(self.name)
        if expiration is None or expiration < 0:
            # Redis evicted the lock key between the previous get() and now
            # we'll handle this when we call pexpire()
            expiration = 0
        pipe.multi()
        pipe.pexpire(self.name, expiration + int(additional_time * 1000))

        try:
            response = pipe.execute()
        except WatchError:
            # someone else acquired the lock
            raise LockError("Cannot extend a lock that's no longer owned")
        if not response[0]:
            # pexpire returns False if the key doesn't exist
            raise LockError("Cannot extend a lock that's no longer owned")
        return True 

def release_lock(lock_name, token):
    """
    Release a lock

    Args:
        lock_name (str): The lock key in redis
        token (bytes): The unique id used

    Returns:
        bool: True if the lock was successfully released
    """
    # this is a StrictRedis instance, we need this for the script installation that LuaLock uses
    redis = caches['redis'].client.get_client()
    lock = LuaLock(redis, lock_name)
    try:
        lock.do_release(token)
    except LockError:
        # If the lock is expired we don't want to raise an error
        pass 

def do_extend(self, additional_time):
        pipe = self.redis.pipeline()
        pipe.watch(self.name)
        lock_value = pipe.get(self.name)
        if lock_value != self.local.token:
            raise LockError("Cannot extend a lock that's no longer owned")
        expiration = pipe.pttl(self.name)
        if expiration is None or expiration < 0:
            # Redis evicted the lock key between the previous get() and now
            # we'll handle this when we call pexpire()
            expiration = 0
        pipe.multi()
        pipe.pexpire(self.name, expiration + int(additional_time * 1000))

        try:
            response = pipe.execute()
        except WatchError:
            # someone else acquired the lock
            raise LockError("Cannot extend a lock that's no longer owned")
        if not response[0]:
            # pexpire returns False if the key doesn't exist
            raise LockError("Cannot extend a lock that's no longer owned")
        return True 

def do_release(self, expected_token):
        name = self.name

        def execute_release(pipe):
            lock_value = pipe.get(name)
            if lock_value != expected_token:
                raise LockError("Cannot release a lock that's no longer owned")
            pipe.delete(name)

        self.redis.transaction(execute_release, name) 

def check_pending_transactions() -> int:
    """
    Find txs that have not been mined after a while
    :return: Number of pending transactions
    """
    number_txs = 0
    try:
        redis = RedisRepository().redis
        with redis.lock('tasks:check_pending_transactions', blocking_timeout=1, timeout=60):
            tx_not_mined_alert = settings.SAFE_TX_NOT_MINED_ALERT_MINUTES
            txs = SafeMultisigTx.objects.pending(older_than=tx_not_mined_alert * 60)
            for tx in txs:
                logger.error('Tx with tx-hash=%s and safe-tx-hash=%s has not been mined after a while, created=%s',
                             tx.ethereum_tx_id, tx.safe_tx_hash, tx.created)
                number_txs += 1
    except LockError:
        pass
    return number_txs 

def do_extend(self, additional_time):
        pipe = self.redis.pipeline()
        pipe.watch(self.name)
        lock_value = pipe.get(self.name)
        if lock_value != self.local.token:
            raise LockError("Cannot extend a lock that's no longer owned")
        expiration = pipe.pttl(self.name)
        if expiration is None or expiration < 0:
            # Redis evicted the lock key between the previous get() and now
            # we'll handle this when we call pexpire()
            expiration = 0
        pipe.multi()
        pipe.pexpire(self.name, expiration + int(additional_time * 1000))

        try:
            response = pipe.execute()
        except WatchError:
            # someone else acquired the lock
            raise LockError("Cannot extend a lock that's no longer owned")
        if not response[0]:
            # pexpire returns False if the key doesn't exist
            raise LockError("Cannot extend a lock that's no longer owned")
        return True 

def deploy_create2_safe_task(self, safe_address: str, retry: bool = True) -> None:
    """
    Check if user has sent enough ether or tokens to the safe account
    If every condition is met safe is deployed
    :param safe_address: safe account
    :param retry: if True, retries are allowed, otherwise don't retry
    """

    assert check_checksum(safe_address)

    redis = RedisRepository().redis
    lock_name = f'locks:deploy_create2_safe:{safe_address}'
    try:
        with redis.lock(lock_name, blocking_timeout=1, timeout=LOCK_TIMEOUT):
            try:
                SafeCreationServiceProvider().deploy_create2_safe_tx(safe_address)
            except NotEnoughFundingForCreation:
                if retry:
                    raise self.retry(countdown=30)
    except LockError:
        logger.warning('Cannot get lock={} for deploying safe={}'.format(lock_name, safe_address)) 

def release(self):
        "Releases the already acquired lock"
        expected_token = self.local.token
        if expected_token is None:
            raise LockError("Cannot release an unlocked lock")
        self.local.token = None
        self.do_release(expected_token) 

def release(self):
        """
        Release the lock
        """
        if self.acquired:
            try:
                self.lock.release()
            except LockError:
                pass  # expected if we don't own the lock anymore
            finally:
                self.acquired = False 

def do_release(self, expected_token):
        name = self.name

        def execute_release(pipe):
            lock_value = pipe.get(name)
            if lock_value != expected_token:
                raise LockError("Cannot release a lock that's no longer owned")
            pipe.delete(name)

        self.redis.transaction(execute_release, name) 

def extend(self, additional_time):
        """
        Adds more time to an already acquired lock.

        ``additional_time`` can be specified as an integer or a float, both
        representing the number of seconds to add.
        """
        if self.local.token is None:
            raise LockError("Cannot extend an unlocked lock")
        if self.timeout is None:
            raise LockError("Cannot extend a lock with no timeout")
        return self.do_extend(additional_time) 

def release_lock(self):
        if self.lock is None:
            return False

        try:
            self.lock.release()

            return True
        except LockError:
            return False 

def do_release(self, expected_token):
        if not bool(self.lua_release(keys=[self.name],
                                     args=[expected_token],
                                     client=self.redis)):
            raise LockError("Cannot release a lock that's no longer owned") 

def extend(self, additional_time):
        """
        Adds more time to an already acquired lock.

        ``additional_time`` can be specified as an integer or a float, both
        representing the number of seconds to add.
        """
        if self.local.token is None:
            raise LockError("Cannot extend an unlocked lock")
        if self.timeout is None:
            raise LockError("Cannot extend a lock with no timeout")
        return self.do_extend(additional_time) 

def extend(self, additional_time):
        """
        Adds more time to an already acquired lock.

        ``additional_time`` can be specified as an integer or a float, both
        representing the number of seconds to add.
        """
        if self.local.token is None:
            raise LockError("Cannot extend an unlocked lock")
        if self.timeout is None:
            raise LockError("Cannot extend a lock with no timeout")
        return self.do_extend(additional_time) 

def do_release(self, expected_token):
        name = self.name

        def execute_release(pipe):
            lock_value = pipe.get(name)
            if lock_value != expected_token:
                raise LockError("Cannot release a lock that's no longer owned")
            pipe.delete(name)

        self.redis.transaction(execute_release, name) 

def release(self):
        "Releases the already acquired lock"
        expected_token = self.local.token
        if expected_token is None:
            raise LockError("Cannot release an unlocked lock")
        self.local.token = None
        self.do_release(expected_token) 

def do_release(self, expected_token):
        if not bool(self.lua_release(keys=[self.name],
                                     args=[expected_token],
                                     client=self.redis)):
            raise LockError("Cannot release a lock that's no longer owned") 

def do_release(self, expected_token):
        if not bool(self.lua_release(keys=[self.name],
                                     args=[expected_token],
                                     client=self.redis)):
            raise LockError("Cannot release a lock that's no longer owned") 

def extend(self, additional_time):
        """
        Adds more time to an already acquired lock.

        ``additional_time`` can be specified as an integer or a float, both
        representing the number of seconds to add.
        """
        if self.local.token is None:
            raise LockError("Cannot extend an unlocked lock")
        if self.timeout is None:
            raise LockError("Cannot extend a lock with no timeout")
        return self.do_extend(additional_time) 

def do_release(self, expected_token):
        name = self.name

        def execute_release(pipe):
            lock_value = pipe.get(name)
            if lock_value != expected_token:
                raise LockError("Cannot release a lock that's no longer owned")
            pipe.delete(name)

        self.redis.transaction(execute_release, name) 

def release(self):
        "Releases the already acquired lock"
        expected_token = self.local.token
        if expected_token is None:
            raise LockError("Cannot release an unlocked lock")
        self.local.token = None
        self.do_release(expected_token) 

def reacquire(self):
        """
        Resets a TTL of an already acquired lock back to a timeout value.
        """
        if self.local.token is None:
            raise LockError("Cannot reacquire an unlocked lock")
        if self.timeout is None:
            raise LockError("Cannot reacquire a lock with no timeout")
        return self.do_reacquire() 

def release(self):
        "Releases the already acquired lock"
        expected_token = self.local.token
        if expected_token is None:
            raise LockError("Cannot release an unlocked lock")
        self.local.token = None
        self.do_release(expected_token) 

def __enter__(self):
        # force blocking, as otherwise the user would have to check whether
        # the lock was actually acquired or not.
        if self.acquire(blocking=True):
            return self
        raise LockError("Unable to acquire lock within the time specified") 

def do_release(self, expected_token):
        if not bool(self.lua_release(keys=[self.name],
                                     args=[expected_token],
                                     client=self.redis)):
            raise LockError("Cannot release a lock that's no longer owned")