Improve redis.sentinel types (#8331)

Author: sobolevn

stubs/redis/redis/sentinel.pyi

@@ -1,22 +1,26 @@
+from collections.abc import Iterable, Iterator
 from typing import Any, TypeVar, overload
-from typing_extensions import Literal
+from typing_extensions import Literal, TypeAlias
 
 from redis.client import Redis
 from redis.commands.sentinel import SentinelCommands
 from redis.connection import Connection, ConnectionPool, SSLConnection
 from redis.exceptions import ConnectionError
 
 _RedisT = TypeVar("_RedisT", bound=Redis[Any])
+_AddressAndPort: TypeAlias = tuple[str, int]
+_SentinelState: TypeAlias = dict[str, Any]  # TODO: this can be a TypedDict
 
 class MasterNotFoundError(ConnectionError): ...
 class SlaveNotFoundError(ConnectionError): ...
 
 class SentinelManagedConnection(Connection):
-    connection_pool: Any
+    connection_pool: SentinelConnectionPool
     def __init__(self, **kwargs) -> None: ...
-    def connect_to(self, address) -> None: ...
+    def connect_to(self, address: _AddressAndPort) -> None: ...
     def connect(self) -> None: ...
-    def read_response(self, disable_decoding: bool = ...): ...
+    # The result can be either `str | bytes` or `list[str | bytes]`
+    def read_response(self, disable_decoding: bool = ...) -> Any: ...
 
 class SentinelManagedSSLConnection(SentinelManagedConnection, SSLConnection): ...
 
@@ -25,25 +29,29 @@ class SentinelConnectionPool(ConnectionPool):
     check_connection: bool
     connection_kwargs: Any
     service_name: str
-    sentinel_manager: Any
-    def __init__(self, service_name, sentinel_manager, **kwargs) -> None: ...
+    sentinel_manager: Sentinel
+    def __init__(self, service_name: str, sentinel_manager: Sentinel, **kwargs) -> None: ...
     def reset(self) -> None: ...
-    def owns_connection(self, connection) -> bool: ...
-    def get_master_address(self): ...
-    def rotate_slaves(self): ...
+    def owns_connection(self, connection: Connection) -> bool: ...
+    def get_master_address(self) -> _AddressAndPort: ...
+    def rotate_slaves(self) -> Iterator[_AddressAndPort]: ...
 
 class Sentinel(SentinelCommands):
     sentinel_kwargs: Any
-    sentinels: Any
+    sentinels: list[Redis[Any]]
     min_other_sentinels: int
     connection_kwargs: Any
     def __init__(
-        self, sentinels, min_other_sentinels: int = ..., sentinel_kwargs: Any | None = ..., **connection_kwargs
+        self,
+        sentinels: Iterable[_AddressAndPort],
+        min_other_sentinels: int = ...,
+        sentinel_kwargs: Any | None = ...,
+        **connection_kwargs,
     ) -> None: ...
-    def check_master_state(self, state, service_name) -> bool: ...
-    def discover_master(self, service_name): ...
-    def filter_slaves(self, slaves): ...
-    def discover_slaves(self, service_name): ...
+    def check_master_state(self, state: _SentinelState, service_name: str) -> bool: ...
+    def discover_master(self, service_name: str) -> _AddressAndPort: ...
+    def filter_slaves(self, slaves: Iterable[_SentinelState]) -> list[_AddressAndPort]: ...
+    def discover_slaves(self, service_name: str) -> list[_AddressAndPort]: ...
     @overload
     def master_for(self, service_name: str, *, connection_pool_class=..., **kwargs) -> Redis[Any]: ...
     @overload