在哪里存储 Class 实例以在 Redux 中重用？

Question

我正在尝试在我的 React/Redux/redux saga 应用程序中通过 Pusher 实现一个消息传递库 Chatkit，我是 Redux 的新手。连接到 chatkit 的代码如下所示：

const chatManager = new ChatManager({
    instanceLocator: 'v1:us1:80215247-1df3-4956-8ba8-9744ffd12161',
    userId: 'sarah',
    tokenProvider: new TokenProvider({ url: 'your.auth.url' })
})

chatManager.connect()
    .then(currentUser => {
        console.log('Successful connection', currentUser)
    })
    .catch(err => {
        console.log('Error on connection', err)
    })

我需要全局存储 chatManager 和 currentUser 对象（它们是具有附加功能的复杂类的实例），以便我以后可以再次使用它们来加入房间、订阅事件等。

我的第一个想法是我应该将它存储在 Redux 中，因为它现在是我的 "global store" 但后来我意识到它可能无法工作，因为它不是我从中取出的原始对象商店，它可能是一个克隆。然后我读到显然只有普通对象应该存储在 Redux 中。

那么，不是普通对象但需要全局存储的东西在哪里？我不想将它们放在 window 对象上，因为我可能会将其转换为 React Native 应用程序，而且它看起来很乱。

Answer 1

根据 Redux FAQ entry on storing "connection"-type objects:

Middleware are the right place for persistent connections like websockets in a Redux app, for several reasons:

Middleware exist for the lifetime of the application

Like with the store itself, you probably only need a single instance of a given connection that the whole app can use

Middleware can see all dispatched actions and dispatch actions themselves. This means a middleware can take dispatched actions and turn those into messages sent over the websocket, and dispatch new actions when a message is received over the websocket.

A websocket connection instance isn't serializable, so it doesn't belong in the store state itself

编辑

这是我的 "sample socket middleware" 示例，已更新为延迟创建套接字直到它看到登录操作：

const createMySocketMiddleware = (url) => {
    let socket;

    return storeAPI => next => action => {
        switch(action.type) {
            case "LOGIN" : {
                socket = createMyWebsocket(url);

                socket.on("message", (message) => {
                    storeAPI.dispatch({
                        type : "SOCKET_MESSAGE_RECEIVED",
                        payload : message
                    });
                });
                break;
            }
            case "SEND_WEBSOCKET_MESSAGE": {
                socket.send(action.payload);
                return;
            }
        }

        return next(action);
    }
}

在哪里存储 Class 实例以在 Redux 中重用？

Where to store Class instance for reusability in Redux?

reactjs

redux

redux-saga