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* Copyright 2022 Harness Inc. All rights reserved.
* Use of this source code is governed by the PolyForm Shield 1.0.0 license
* that can be found in the licenses directory at the root of this repository, also available at
* https://polyformproject.org/wp-content/uploads/2020/06/PolyForm-Shield-1.0.0.txt.
*/
import React, { useEffect, useState } from 'react'
import qs, { IStringifyOptions } from 'qs'
import { EventSourcePolyfill } from 'event-source-polyfill'
import { useHistory, useParams } from 'react-router-dom'
import SessionToken from 'framework/utils/SessionToken'
import { returnUrlParams } from '@common/utils/routeUtils'
import { getLoginPageURL } from 'framework/utils/SessionUtils'
import routes from '@common/RouteDefinitions'
import type { AccountPathProps } from '@common/interfaces/RouteInterfaces'
import { useDeepCompareEffect } from './useDeepCompareEffect'
interface EventSourceListenerReturn {
startListening: () => void
stopListening: () => void
}
enum EventType {
MESSAGE = 'message',
OPEN = 'open',
ERROR = 'error'
}
export type EventSourceEvent<T> = {
onOpen?: () => void
onError?: (event?: Event) => void
onParseError?: (error?: Error) => void
onMessage: (event: { data: T; event: Event }) => void
options?: boolean | AddEventListenerOptions | EventListenerOptions
}
interface EventSourceListenerProps<T> {
url: string
event: EventSourceEvent<T>
queryParams?: Record<string, unknown>
queryParamStringifyOptions?: IStringifyOptions
lazy?: boolean
}
export const useEventSourceListener = <T extends unknown>({
url,
event,
lazy = false,
queryParams,
queryParamStringifyOptions
}: EventSourceListenerProps<T>): EventSourceListenerReturn => {
const [init, setInit] = useState<boolean>(false)
const { accountId } = useParams<AccountPathProps>()
const history = useHistory()
const [forceStop, setForceStop] = React.useState(false)
const [source, setSource] = useState<EventSource>()
const { onMessage, onError, onOpen, onParseError, options } = event
const token = SessionToken.getToken()
const getRequestOptions = React.useCallback((): Partial<RequestInit> => {
const headers: HeadersInit = {}
Iif (token && token.length > 0) {
headers.Authorization = `Bearer ${token}`
}
return { headers }
}, [token])
const getQueryParams = (params?: Record<string, unknown>): string => {
return `?${qs.stringify({ ...params, routingId: accountId }, queryParamStringifyOptions)}`
}
const onMessageEventListener = (_event: Event & { data: string }): void => {
let parsedData
try {
parsedData = JSON.parse(_event.data)
onMessage({ data: parsedData, event: _event })
} catch (e) {
onParseError?.(e as Error)
}
}
const onOpenEventListener = (): void => {
onOpen?.()
}
const onErrorEventListener = (_event: Event): void => {
onError?.(_event)
}
useDeepCompareEffect(() => {
if (!token) {
history.push({
pathname: routes.toRedirect(),
search: returnUrlParams(getLoginPageURL({ returnUrl: window.location.href }))
})
} else {
setSource(new EventSourcePolyfill(`${url}${getQueryParams(queryParams)}`, getRequestOptions()))
}
}, [url, token, queryParams, accountId])
const createListener = (_source: EventSource): void => {
removeListener(_source)
_source.addEventListener(EventType.MESSAGE, onMessageEventListener as EventListenerOrEventListenerObject, options)
_source.addEventListener(EventType.OPEN, onOpenEventListener as EventListenerOrEventListenerObject, options)
_source.addEventListener(EventType.ERROR, onErrorEventListener as EventListenerOrEventListenerObject, options)
!init && setInit(false)
}
const removeListener = (_source: EventSource): void => {
_source.removeEventListener(
EventType.MESSAGE,
onMessageEventListener as EventListenerOrEventListenerObject,
options
)
_source.removeEventListener(EventType.OPEN, onOpenEventListener as EventListenerOrEventListenerObject, options)
_source.removeEventListener(EventType.ERROR, onErrorEventListener as EventListenerOrEventListenerObject, options)
}
useEffect(() => {
if (source && (init || !lazy) && !forceStop) {
createListener(source)
}
return () => {
if (source) {
removeListener(source)
source.close()
}
}
}, [source])
const startListening = React.useCallback(() => {
Eif (source) {
createListener(source)
setForceStop(false)
}
}, [source])
const stopListening = React.useCallback(() => {
Eif (source) {
removeListener(source)
setForceStop(true)
}
}, [source])
return { startListening, stopListening }
}
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