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@yuzaijs/extension-ws

v0.1.0

Published

WebSocket extension for Yuzai bot framework

Readme

雨仔 WebSocket 扩展

正常来说,Yuzai 不关心 Adapter 的具体实现,因此 Adapter 应该自己维护 WebSocket 服务器。 但鉴于反向 WebSocket 在各种协议中非常常见,以及出于兼容性考虑,这里以扩展的形式提供一个反向 WebSocket 服务器。 适配器注册的流程为:

  1. import { importExtension } from "yuzai/extensions"; const { addWsPath } = importExtension("ws");
  2. 调用 addWsPath(path, onConnectHandler),注册一个 WebSocket 路径和连接处理函数。
  3. WebSocketServer 会在收到 WebSocket 升级请求时调用 onConnectHandler,并传递 WebSocket 实例,适配器应保存该实例。
  4. onConnectHandler 应返回一个处理函数 wsHandler,WS 会在收到消息时调用该函数,并传递消息和 WebSocket 实例。
  5. 适配器可以在 wsHandler 中处理消息,并通过 WebSocket 实例的 sendMessage() 方法发送消息。

相关方法类型注释如下:

type wsHandler = (
  message: WebSocket.RawData,
  ws: WebSocket & { sendMessage: (data: object) => void },
) => void;
type onConnectHandler = (
  ws: WebSocket & { sendMessage: (data: object) => void },
  path: string,
) => wsHandler;
type addPath = (path: string, onConnectHandler: onConnectHandler) => void;

传递给适配器的 WebSocket 实例包含包装日志后的 sendMessage() 方法,建议用此发送消息。

可以参考 yuzai-adapter-builtin/OneBotv11.ts 中的实现。