Source code for redis.exceptions

"Core exceptions raised by the Redis client"

[docs]class RedisError(Exception): pass
[docs]class ConnectionError(RedisError): pass
[docs]class TimeoutError(RedisError): pass
[docs]class AuthenticationError(ConnectionError): pass
[docs]class AuthorizationError(ConnectionError): pass
[docs]class BusyLoadingError(ConnectionError): pass
[docs]class InvalidResponse(RedisError): pass
[docs]class ResponseError(RedisError): pass
[docs]class DataError(RedisError): pass
[docs]class PubSubError(RedisError): pass
[docs]class WatchError(RedisError): pass
[docs]class NoScriptError(ResponseError): pass
[docs]class OutOfMemoryError(ResponseError): """ Indicates the database is full. Can only occur when either: * Redis maxmemory-policy=noeviction * Redis maxmemory-policy=volatile* and there are no evictable keys For more information see `Memory optimization in Redis <>`_. # noqa """ pass
[docs]class ExecAbortError(ResponseError): pass
[docs]class ReadOnlyError(ResponseError): pass
[docs]class NoPermissionError(ResponseError): pass
[docs]class ModuleError(ResponseError): pass
[docs]class LockError(RedisError, ValueError): "Errors acquiring or releasing a lock" # NOTE: For backwards compatibility, this class derives from ValueError. # This was originally chosen to behave like threading.Lock. def __init__(self, message, lock_name=None): self.message = message self.lock_name = lock_name
[docs]class LockNotOwnedError(LockError): "Error trying to extend or release a lock that is (no longer) owned" pass
[docs]class ChildDeadlockedError(Exception): "Error indicating that a child process is deadlocked after a fork()" pass
[docs]class AuthenticationWrongNumberOfArgsError(ResponseError): """ An error to indicate that the wrong number of args were sent to the AUTH command """ pass
[docs]class RedisClusterException(Exception): """ Base exception for the RedisCluster client """ pass
[docs]class ClusterError(RedisError): """ Cluster errors occurred multiple times, resulting in an exhaustion of the command execution TTL """ pass
[docs]class ClusterDownError(ClusterError, ResponseError): """ Error indicated CLUSTERDOWN error received from cluster. By default Redis Cluster nodes stop accepting queries if they detect there is at least a hash slot uncovered (no available node is serving it). This way if the cluster is partially down (for example a range of hash slots are no longer covered) the entire cluster eventually becomes unavailable. It automatically returns available as soon as all the slots are covered again. """ def __init__(self, resp): self.args = (resp,) self.message = resp
[docs]class AskError(ResponseError): """ Error indicated ASK error received from cluster. When a slot is set as MIGRATING, the node will accept all queries that pertain to this hash slot, but only if the key in question exists, otherwise the query is forwarded using a -ASK redirection to the node that is target of the migration. src node: MIGRATING to dst node get > ASK error ask dst node > ASKING command dst node: IMPORTING from src node asking command only affects next command any op will be allowed after asking command """ def __init__(self, resp): """should only redirect to master node""" self.args = (resp,) self.message = resp slot_id, new_node = resp.split(" ") host, port = new_node.rsplit(":", 1) self.slot_id = int(slot_id) self.node_addr =, self.port = host, int(port)
[docs]class TryAgainError(ResponseError): """ Error indicated TRYAGAIN error received from cluster. Operations on keys that don't exist or are - during resharding - split between the source and destination nodes, will generate a -TRYAGAIN error. """ def __init__(self, *args, **kwargs): pass
[docs]class ClusterCrossSlotError(ResponseError): """ Error indicated CROSSSLOT error received from cluster. A CROSSSLOT error is generated when keys in a request don't hash to the same slot. """ message = "Keys in request don't hash to the same slot"
[docs]class MovedError(AskError): """ Error indicated MOVED error received from cluster. A request sent to a node that doesn't serve this key will be replayed with a MOVED error that points to the correct node. """ pass
[docs]class MasterDownError(ClusterDownError): """ Error indicated MASTERDOWN error received from cluster. Link with MASTER is down and replica-serve-stale-data is set to 'no'. """ pass
[docs]class SlotNotCoveredError(RedisClusterException): """ This error only happens in the case where the connection pool will try to fetch what node that is covered by a given slot. If this error is raised the client should drop the current node layout and attempt to reconnect and refresh the node layout again """ pass
[docs]class MaxConnectionsError(ConnectionError): ...