chatExcel

from __future__ import annotations from collections.abc import Sequence from ..frames import Frame from ..typing import ExtensionName, ExtensionParameter __all__ = ["Extension", "ClientExtensionFactory", "ServerExtensionFactory"] class Extension: """ Base class for extensions. """ name: ExtensionName """Extension identifier.""" def decode(self, frame: Frame, *, max_size: int | None = None) -> Frame: """ Decode an incoming frame. Args: frame: Incoming frame. max_size: Maximum payload size in bytes. Returns: Decoded frame. Raises: PayloadTooBig: If decoding the payload exceeds ``max_size``. """ raise NotImplementedError def encode(self, frame: Frame) -> Frame: """ Encode an outgoing frame. Args: frame: Outgoing frame. Returns: Encoded frame. """ raise NotImplementedError class ClientExtensionFactory: """ Base class for client-side extension factories. """ name: ExtensionName """Extension identifier.""" def get_request_params(self) -> Sequence[ExtensionParameter]: """ Build parameters to send to the server for this extension. Returns: Parameters to send to the server. """ raise NotImplementedError def process_response_params( self, params: Sequence[ExtensionParameter], accepted_extensions: Sequence[Extension], ) -> Extension: """ Process parameters received from the server. Args: params: Parameters received from the server for this extension. accepted_extensions: List of previously accepted extensions. Returns: An extension instance. Raises: NegotiationError: If parameters aren't acceptable. """ raise NotImplementedError class ServerExtensionFactory: """ Base class for server-side extension factories. """ name: ExtensionName """Extension identifier.""" def process_request_params( self, params: Sequence[ExtensionParameter], accepted_extensions: Sequence[Extension], ) -> tuple[list[ExtensionParameter], Extension]: """ Process parameters received from the client. Args: params: Parameters received from the client for this extension. accepted_extensions: List of previously accepted extensions. Returns: To accept the offer, parameters to send to the client for this extension and an extension instance. Raises: NegotiationError: To reject the offer, if parameters received from the client aren't acceptable. """ raise NotImplementedError