86 lines
2.7 KiB
JavaScript
86 lines
2.7 KiB
JavaScript
import { updateInstanceInfo } from '../../_actions/instances'
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import { createStream } from '../../_actions/streaming'
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import { getTimeline } from '../../_api/timelines'
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import { addStatusesOrNotifications } from '../../_actions/addStatusOrNotification'
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import { TIMELINE_BATCH_SIZE } from '../../_static/timelines'
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export function timelineObservers (store) {
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// stream to watch for local/federated/etc. updates. home and notification
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// updates are handled in timelineObservers.js
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let currentTimelineStream
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function shutdownPreviousStream () {
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if (currentTimelineStream) {
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currentTimelineStream.close()
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currentTimelineStream = null
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if (process.env.NODE_ENV !== 'production') {
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window.currentTimelineStream = null
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}
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}
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}
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function shouldObserveTimeline (timeline) {
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return timeline &&
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!(
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timeline !== 'local' &&
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timeline !== 'federated' &&
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!timeline.startsWith('list/') &&
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!timeline.startsWith('tag/')
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)
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}
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store.observe('currentTimeline', async (currentTimeline) => {
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if (!process.browser) {
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return
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}
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shutdownPreviousStream()
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if (!shouldObserveTimeline(currentTimeline)) {
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return
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}
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let { currentInstance } = store.get()
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let { accessToken } = store.get()
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await updateInstanceInfo(currentInstance)
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let currentTimelineIsUnchanged = () => {
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let {
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currentInstance: newCurrentInstance,
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currentTimeline: newCurrentTimeline
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} = store.get()
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return newCurrentInstance === currentInstance &&
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newCurrentTimeline === currentTimeline
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}
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if (!currentTimelineIsUnchanged()) {
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return
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}
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let timelineItemIds = store.getForTimeline(currentInstance,
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currentTimeline, 'timelineItemIds')
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let firstTimelineItemId = timelineItemIds && timelineItemIds[0]
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let onOpenStream = async () => {
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if (!firstTimelineItemId || !currentTimelineIsUnchanged()) {
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return
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}
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// fill in the "streaming gap" – i.e. fetch the most recent 20 items so that there isn't
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// a big gap in the timeline if you haven't looked at it in awhile
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let newTimelineItems = await getTimeline(currentInstance, accessToken,
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currentTimeline, null, firstTimelineItemId, TIMELINE_BATCH_SIZE)
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if (newTimelineItems.length) {
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addStatusesOrNotifications(currentInstance, currentTimeline, newTimelineItems)
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}
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}
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let { currentInstanceInfo } = store.get()
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let streamingApi = currentInstanceInfo.urls.streaming_api
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currentTimelineStream = createStream(streamingApi, currentInstance, accessToken,
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currentTimeline, onOpenStream)
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if (process.env.NODE_ENV !== 'production') {
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window.currentTimelineStream = currentTimelineStream
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}
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})
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}
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