react-native - 将 socket.io 与 redux reducer 相结合

Question

堆栈 - React native、socket.io、Node.js

我正在开发一个聊天应用程序。在这一点上，我有这样的流程: 用户单击“发送消息”-> 消息由 socket.io 发送到服务器-> 服务器上的套接字连接获取消息。 现在，从那时起，我想要的是从服务器发送到 redux reducer 的消息，然后 reducer 将返回前端组件将呈现的新状态。
如何在服务器端套接字和 reducer 之间建立连接？

当前服务器:

    const express = require("express");
    const app = express();
    const port = 3000;
    const server = require("http").createServer(app);
    let io = require("socket.io")(server);

    app.get("/", (req, res) => res.send("Hello World!"));

    io.on("connection", socket => {
      console.log("a user connected");

      socket.on("join", (name, message) => {
      console.log("chat room connected")
      });

    });

    server.listen(port, () => console.log(`listening on port ${port}!`));

电流 reducer :

    const initialState = {
      chats: [

      ]
    };
    const chatsReducer = (state = initialState, action) => {
      let sender = action.sender;
      let message = action.message;

      switch (action.type) {
        case SEND_MESSAGE:
          let newMessage = {
            sender: sender,
            message: message
          };

          let newState = { ...state, chats: state.chats.push(newMessage) };
          return state;

        default:
          state;
      }
      return state;
    };

    export default chatsReducer;

Answer 1

您可以像这样从节点服务器发出新消息。

let msg = {message: 'Actual Message', sender: 'Name of sender'}
io.on('connection', socket => {
  socket.on('chat message', msg => {
    io.emit('chat message', msg);
  });
}); 

然后在聊天组件中监听聊天消息事件。

 componentDidMount() {
    this.socket = io("http://server.address:port");
    this.socket.on("chat message", msg => {
       this.props.onMessageReceivedAction (msg); // import action and will execute on message received event
   });
});

然后添加 Action :

export const onMessageReceivedAction = (params) => {
  return  {type: MESSAGE_RECEIVED, payload:msg};
};

将收到消息的 reducer 案例添加到您的 reducer

case MESSAGE_RECEIVED:

  let newMessage = {
    sender: payload.sender,
    message: payload.message
  };

  return { ...state, chats: state.chats.push(newMessage) };

这将返回新状态，并且映射到上述状态的组件属性将被重新渲染。

希望这能回答您的问题。