Simplify EventStream handling

ui/src/App.js

@@ -1,4 +1,3 @@
-import React, { useEffect } from 'react'
 import ReactGA from 'react-ga'
 import { Provider } from 'react-redux'
 import { createHashHistory } from 'history'
@@ -34,7 +33,6 @@ import {
 import createAdminStore from './store/createAdminStore'
 import { i18nProvider } from './i18n'
 import config, { shareInfo } from './config'
-import { setDispatch, startEventStream, stopEventStream } from './eventStream'
 import { keyMap } from './hotkeys'
 import useChangeThemeColor from './useChangeThemeColor'
 import SharePlayer from './share/SharePlayer'
@@ -76,18 +74,6 @@ const App = () => (
 
 const Admin = (props) => {
   useChangeThemeColor()
-  useEffect(() => {
-    if (config.devActivityPanel) {
-      setDispatch(adminStore.dispatch)
-      authProvider
-        .checkAuth()
-        .then(() => startEventStream(adminStore.dispatch))
-        .catch(() => {})
-    }
-    return () => {
-      stopEventStream()
-    }
-  }, [])
 
   return (
     <RAAdmin

ui/src/actions/serverEvents.js

@@ -2,13 +2,10 @@ export const EVENT_SCAN_STATUS = 'scanStatus'
 export const EVENT_SERVER_START = 'serverStart'
 export const EVENT_REFRESH_RESOURCE = 'refreshResource'
 
-export const processEvent = (type, data) => {
+export const processEvent = (type, data) => ({
-  return {
+  type,
-    type,
+  data: data,
-    data: data,
+})
-  }
-}
-
 export const scanStatusUpdate = (data) => ({
   type: EVENT_SCAN_STATUS,
   data: data,

ui/src/authProvider.js

@@ -1,7 +1,6 @@
 import jwtDecode from 'jwt-decode'
 import { baseUrl } from './utils'
 import config from './config'
-import { startEventStream, stopEventStream } from './eventStream'
 
 // config sent from server may contain authentication info, for example when the user is authenticated
 // by a reverse proxy request header
@@ -48,9 +47,6 @@ const authProvider = {
         storeAuthenticationInfo(response)
         // Avoid "going to create admin" dialog after logout/login without a refresh
         config.firstTime = false
-        if (config.devActivityPanel) {
-          startEventStream()
-        }
         return response
       })
       .catch((error) => {
@@ -66,7 +62,6 @@ const authProvider = {
   },
 
   logout: () => {
-    stopEventStream()
     removeItems()
     return Promise.resolve()
   },
@@ -90,11 +85,11 @@ const authProvider = {
   },
 
   getIdentity: () => {
-    return {
+    return Promise.resolve({
       id: localStorage.getItem('username'),
       fullName: localStorage.getItem('name'),
       avatar: localStorage.getItem('avatar'),
-    }
+    })
   },
 }
 

ui/src/eventStream.js

@@ -1,83 +1,42 @@
 import { baseUrl } from './utils'
 import throttle from 'lodash.throttle'
 import { processEvent, serverDown } from './actions'
-import { httpClient } from './dataProvider'
 import { REST_URL } from './consts'
 
-const defaultIntervalCheck = 20000
+const newEventStream = async () => {
-const reconnectIntervalCheck = 2000
+  let url = baseUrl(`${REST_URL}/events`)
-let currentIntervalCheck = reconnectIntervalCheck
+  if (localStorage.getItem('token')) {
-let es = null
+    url = url + `?jwt=${localStorage.getItem('token')}`
-let dispatch = null
-let timeout = null
-
-const getEventStream = async () => {
-  if (!es) {
-    // Call `keepalive` to refresh the jwt token
-    await httpClient(`${REST_URL}/keepalive/keepalive`)
-    let url = baseUrl(`${REST_URL}/events`)
-    if (localStorage.getItem('token')) {
-      url = url + `?jwt=${localStorage.getItem('token')}`
-    }
-    es = new EventSource(url)
   }
-  return es
+  return new EventSource(url)
 }
 
-// Reestablish the event stream after 20 secs of inactivity
+const eventHandler = (dispatchFn) => (event) => {
-const setTimeout = (value) => {
-  currentIntervalCheck = value
-  if (timeout) {
-    window.clearTimeout(timeout)
-  }
-  timeout = window.setTimeout(async () => {
-    es?.close()
-    es = null
-    await startEventStream()
-  }, currentIntervalCheck)
-}
-
-const stopEventStream = () => {
-  es?.close()
-  es = null
-  if (timeout) {
-    window.clearTimeout(timeout)
-  }
-  timeout = null
-  console.log('eventSource closed') // TODO For debug purposes. Remove later
-}
-
-const setDispatch = (dispatchFunc) => {
-  dispatch = dispatchFunc
-}
-
-const eventHandler = (event) => {
   const data = JSON.parse(event.data)
   if (event.type !== 'keepAlive') {
-    dispatch(processEvent(event.type, data))
+    dispatchFn(processEvent(event.type, data))
   }
-  setTimeout(defaultIntervalCheck) // Reset timeout on every received message
 }
 
-const throttledEventHandler = throttle(eventHandler, 100, { trailing: true })
+const throttledEventHandler = (dispatchFn) =>
+  throttle(eventHandler(dispatchFn), 100, { trailing: true })
 
-const startEventStream = async () => {
+const startEventStream = async (dispatchFn) => {
-  setTimeout(currentIntervalCheck)
   if (!localStorage.getItem('is-authenticated')) {
     return Promise.resolve()
   }
-  return getEventStream()
+  return newEventStream()
     .then((newStream) => {
-      newStream.addEventListener('serverStart', eventHandler)
+      newStream.addEventListener('serverStart', eventHandler(dispatchFn))
-      newStream.addEventListener('scanStatus', throttledEventHandler)
+      newStream.addEventListener(
-      newStream.addEventListener('refreshResource', eventHandler)
+        'scanStatus',
-      newStream.addEventListener('keepAlive', eventHandler)
+        throttledEventHandler(dispatchFn)
+      )
+      newStream.addEventListener('refreshResource', eventHandler(dispatchFn))
+      newStream.addEventListener('keepAlive', eventHandler(dispatchFn))
       newStream.onerror = (e) => {
         console.log('EventStream error', e)
-        es?.close()
+        dispatchFn(serverDown())
-        es = null
-        setTimeout(reconnectIntervalCheck)
-        dispatch(serverDown())
       }
       return newStream
     })
@@ -86,4 +45,4 @@ const startEventStream = async () => {
     })
 }
 
-export { setDispatch, startEventStream, stopEventStream }
+export { startEventStream }

ui/src/layout/UserMenu.js

@@ -1,5 +1,11 @@
 import * as React from 'react'
-import { Children, cloneElement, isValidElement, useState } from 'react'
+import {
+  Children,
+  cloneElement,
+  isValidElement,
+  useEffect,
+  useState,
+} from 'react'
 import PropTypes from 'prop-types'
 import { useTranslate, useGetIdentity } from 'react-admin'
 import {
@@ -16,6 +22,9 @@ import {
 import { makeStyles } from '@material-ui/core/styles'
 import AccountCircle from '@material-ui/icons/AccountCircle'
 import config from '../config'
+import authProvider from '../authProvider'
+import { startEventStream } from '../eventStream'
+import { useDispatch } from 'react-redux'
 
 const useStyles = makeStyles((theme) => ({
   user: {},
@@ -40,8 +49,19 @@ const UserMenu = (props) => {
   const translate = useTranslate()
   const { loaded, identity } = useGetIdentity()
   const classes = useStyles(props)
+  const dispatch = useDispatch()
 
   const { children, label, icon, logout } = props
+
+  useEffect(() => {
+    if (config.devActivityPanel) {
+      authProvider
+        .checkAuth()
+        .then(() => startEventStream(dispatch))
+        .catch(() => {})
+    }
+  }, [])
+
   if (!logout && !children) return null
   const open = Boolean(anchorEl)