Moved ClusterParser exceptions to BaseParser class (#3475)

* Moved ClusterParser exceptions to BaseParser class

* Codestyle fixes

* Removed ubused imports

* Sorted imports

Author: vladvildanov

Diff for: docs/clustering.rst

@@ -17,8 +17,8 @@ Nodes <#specifying-target-nodes>`__ \| `Multi-key
 Commands <#multi-key-commands>`__ \| `Known PubSub
 Limitations <#known-pubsub-limitations>`__
 
-Creating clusters
------------------
+Connecting to cluster
+---------------------
 
 Connecting redis-py to a Redis Cluster instance(s) requires at a minimum
 a single node for cluster discovery. There are multiple ways in which a

Diff for: redis/_parsers/base.py

@@ -9,18 +9,24 @@
     from async_timeout import timeout as async_timeout
 
 from ..exceptions import (
+    AskError,
     AuthenticationError,
     AuthenticationWrongNumberOfArgsError,
     BusyLoadingError,
+    ClusterCrossSlotError,
+    ClusterDownError,
     ConnectionError,
     ExecAbortError,
+    MasterDownError,
     ModuleError,
+    MovedError,
     NoPermissionError,
     NoScriptError,
     OutOfMemoryError,
     ReadOnlyError,
     RedisError,
     ResponseError,
+    TryAgainError,
 )
 from ..typing import EncodableT
 from .encoders import Encoder
@@ -72,6 +78,12 @@ class BaseParser(ABC):
         "READONLY": ReadOnlyError,
         "NOAUTH": AuthenticationError,
         "NOPERM": NoPermissionError,
+        "ASK": AskError,
+        "TRYAGAIN": TryAgainError,
+        "MOVED": MovedError,
+        "CLUSTERDOWN": ClusterDownError,
+        "CROSSSLOT": ClusterCrossSlotError,
+        "MASTERDOWN": MasterDownError,
     }
 
     @classmethod

Diff for: redis/asyncio/cluster.py

@@ -26,7 +26,7 @@
     _RedisCallbacksRESP3,
 )
 from redis.asyncio.client import ResponseCallbackT
-from redis.asyncio.connection import Connection, DefaultParser, SSLConnection, parse_url
+from redis.asyncio.connection import Connection, SSLConnection, parse_url
 from redis.asyncio.lock import Lock
 from redis.asyncio.retry import Retry
 from redis.auth.token import TokenInterface
@@ -50,12 +50,10 @@
 from redis.exceptions import (
     AskError,
     BusyLoadingError,
-    ClusterCrossSlotError,
     ClusterDownError,
     ClusterError,
     ConnectionError,
     DataError,
-    MasterDownError,
     MaxConnectionsError,
     MovedError,
     RedisClusterException,
@@ -66,33 +64,13 @@
     TryAgainError,
 )
 from redis.typing import AnyKeyT, EncodableT, KeyT
-from redis.utils import (
-    deprecated_function,
-    dict_merge,
-    get_lib_version,
-    safe_str,
-    str_if_bytes,
-)
+from redis.utils import deprecated_function, get_lib_version, safe_str, str_if_bytes
 
 TargetNodesT = TypeVar(
     "TargetNodesT", str, "ClusterNode", List["ClusterNode"], Dict[Any, "ClusterNode"]
 )
 
 
-class ClusterParser(DefaultParser):
-    EXCEPTION_CLASSES = dict_merge(
-        DefaultParser.EXCEPTION_CLASSES,
-        {
-            "ASK": AskError,
-            "CLUSTERDOWN": ClusterDownError,
-            "CROSSSLOT": ClusterCrossSlotError,
-            "MASTERDOWN": MasterDownError,
-            "MOVED": MovedError,
-            "TRYAGAIN": TryAgainError,
-        },
-    )
-
-
 class RedisCluster(AbstractRedis, AbstractRedisCluster, AsyncRedisClusterCommands):
     """
     Create a new RedisCluster client.
@@ -297,7 +275,6 @@ def __init__(
         kwargs: Dict[str, Any] = {
             "max_connections": max_connections,
             "connection_class": Connection,
-            "parser_class": ClusterParser,
             # Client related kwargs
             "credential_provider": credential_provider,
             "username": username,

Diff for: redis/cluster.py

@@ -13,7 +13,7 @@
 from redis.client import CaseInsensitiveDict, PubSub, Redis
 from redis.commands import READ_COMMANDS, RedisClusterCommands
 from redis.commands.helpers import list_or_args
-from redis.connection import ConnectionPool, DefaultParser, parse_url
+from redis.connection import ConnectionPool, parse_url
 from redis.crc import REDIS_CLUSTER_HASH_SLOTS, key_slot
 from redis.event import (
     AfterPooledConnectionsInstantiationEvent,
@@ -24,12 +24,10 @@
 from redis.exceptions import (
     AskError,
     AuthenticationError,
-    ClusterCrossSlotError,
     ClusterDownError,
     ClusterError,
     ConnectionError,
     DataError,
-    MasterDownError,
     MovedError,
     RedisClusterException,
     RedisError,
@@ -193,20 +191,6 @@ def cleanup_kwargs(**kwargs):
     return connection_kwargs
 
 
-class ClusterParser(DefaultParser):
-    EXCEPTION_CLASSES = dict_merge(
-        DefaultParser.EXCEPTION_CLASSES,
-        {
-            "ASK": AskError,
-            "TRYAGAIN": TryAgainError,
-            "MOVED": MovedError,
-            "CLUSTERDOWN": ClusterDownError,
-            "CROSSSLOT": ClusterCrossSlotError,
-            "MASTERDOWN": MasterDownError,
-        },
-    )
-
-
 class AbstractRedisCluster:
     RedisClusterRequestTTL = 16
 
@@ -692,7 +676,6 @@ def on_connect(self, connection):
         Initialize the connection, authenticate and select a database and send
          READONLY if it is set during object initialization.
         """
-        connection.set_parser(ClusterParser)
         connection.on_connect()
 
         if self.read_from_replicas: