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feat(websockets): remove polling and add middleware for websockets
Merge pull request #452 from qri-io/websockets
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,82 @@ | ||
| import { Dispatch, AnyAction, Store } from 'redux' | ||
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| import { WEBSOCKETS_URL, WEBSOCKETS_PROTOCOL } from '../constants' | ||
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| import { Store as IStore } from '../models/store' | ||
| import { fetchWorkingStatus } from '../actions/api' | ||
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| // wsMiddleware manages requests to connect to the qri backend via websockets | ||
| // as well as managing messages that get passed through | ||
| export const wsConnect = () => ({ type: 'WS_CONNECT' }) | ||
| export const wsConnecting = () => ({ type: 'WS_CONNECTING' }) | ||
| export const wsConnected = () => ({ type: 'WS_CONNECTED' }) | ||
| export const wsDisconnect = () => ({ type: 'WS_DISCONNECT' }) | ||
| export const wsDisconnected = () => ({ type: 'WS_DISCONNECTED' }) | ||
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| const socketMiddleware = () => { | ||
| let socket: WebSocket = null | ||
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| const onOpen = (store: Store<IStore>) => (event: Event) => { | ||
| if (socket !== null) return | ||
| store.dispatch(wsConnect()) | ||
| } | ||
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| const onClose = (store: Store<IStore>) => () => { | ||
| store.dispatch(wsDisconnected()) | ||
| } | ||
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| const onMessage = (store: Store<IStore>) => (event: MessageEvent) => { | ||
| const payload = JSON.parse(event.data) | ||
| switch (payload.Type) { | ||
| case 'modify': | ||
| case 'create': | ||
| case 'remove': | ||
| const { workingDataset } = store.getState() | ||
| const { peername, name } = workingDataset | ||
| // if the websocket message Username and Dsname match the peername and | ||
| // dataset name of the dataset that is currently being viewed, fetch | ||
| // status | ||
| if (peername && name && peername === payload.Username && name === payload.Dsname) { | ||
| fetchWorkingStatus()(store.dispatch, store.getState) | ||
| } | ||
| break | ||
| default: | ||
| console.log('default') | ||
| } | ||
| } | ||
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| // middleware | ||
| return (store: Store<IStore>) => (next: Dispatch<AnyAction>) => (action: AnyAction) => { | ||
| switch (action.type) { | ||
| case 'WS_CONNECT': | ||
| if (socket !== null) { | ||
| socket.close() | ||
| } | ||
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| // connect to the remote host | ||
| socket = new WebSocket(WEBSOCKETS_URL, WEBSOCKETS_PROTOCOL) | ||
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| // websocket handlers | ||
| socket.onmessage = onMessage(store) | ||
| socket.onclose = onClose(store) | ||
| socket.onopen = onOpen(store) | ||
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| break | ||
| case 'WS_DISCONNECT': | ||
| if (socket !== null) { | ||
| socket.close() | ||
| } | ||
| socket = null | ||
| console.log('websocket closed') | ||
| break | ||
| // case 'NEW_MESSAGE': | ||
| // console.log('sending a message', action.msg) | ||
| // socket.send(JSON.stringify({ command: 'NEW_MESSAGE', message: action.msg })) | ||
| // break | ||
| default: | ||
| return next(action) | ||
| } | ||
| } | ||
| } | ||
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| export default socketMiddleware() |
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