pinafore/routes/_actions/streaming.js

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import { TimelineStream } from '../_api/TimelineStream'
import identity from 'lodash/identity'
import { database } from '../_database/database'
import { store } from '../_store/store'
import { scheduleIdleTask } from '../_utils/scheduleIdleTask'
import throttle from 'lodash/throttle'
import { mark, stop } from '../_utils/marks'
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async function removeDuplicates (instanceName, timelineName, updates) {
// remove duplicates, including duplicates due to reblogs
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let timelineItemIds = store.getForTimeline(instanceName, timelineName, 'timelineItemIds') || []
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let reblogIds = (await Promise.all(timelineItemIds.map(async timelineItemId => {
let status = await database.getStatus(instanceName, timelineItemId)
return status.reblog && status.reblog.id
}))).filter(identity)
let existingItemIds = new Set([].concat(timelineItemIds).concat(reblogIds))
return updates.filter(update => !existingItemIds.has(update.id))
}
async function processFreshChanges (instanceName, timelineName) {
mark('processFreshChanges')
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let freshChanges = store.getForTimeline(instanceName, timelineName, 'freshChanges')
if (freshChanges.updates && freshChanges.updates.length) {
let updates = freshChanges.updates.slice()
freshChanges.updates = []
store.setForTimeline(instanceName, timelineName, {freshChanges: freshChanges})
updates = await removeDuplicates(instanceName, timelineName, updates)
await database.insertTimelineItems(instanceName, timelineName, updates)
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let itemIdsToAdd = store.getForTimeline(instanceName, timelineName, 'itemIdsToAdd') || []
if (updates && updates.length) {
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itemIdsToAdd = itemIdsToAdd.concat(updates.map(_ => _.id))
console.log('adding ', itemIdsToAdd.length, 'items to itemIdsToAdd')
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store.setForTimeline(instanceName, timelineName, {itemIdsToAdd: itemIdsToAdd})
}
stop('processFreshChanges')
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}
}
const lazilyProcessFreshChanges = throttle((instanceName, timelineName) => {
scheduleIdleTask(() => {
processFreshChanges(instanceName, timelineName)
})
}, 5000)
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function handleStreamMessage (instanceName, timelineName, message) {
mark('handleStreamMessage')
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let { event, payload } = message
let key = event === 'update' ? 'updates' : 'deletes'
let freshChanges = store.getForTimeline(instanceName, timelineName, 'freshChanges') || {}
freshChanges[key] = freshChanges[key] || []
freshChanges[key].push(JSON.parse(payload))
store.setForTimeline(instanceName, timelineName, {freshChanges: freshChanges})
lazilyProcessFreshChanges(instanceName, timelineName)
stop('handleStreamMessage')
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}
export function createStream (streamingApi, instanceName, accessToken, timelineName) {
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return new TimelineStream(streamingApi, accessToken, timelineName, {
onMessage (msg) {
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if (msg.event !== 'update' && msg.event !== 'delete') {
console.error("don't know how to handle event", msg)
return
}
scheduleIdleTask(() => {
handleStreamMessage(instanceName, timelineName, msg)
})
},
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onOpen () {
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console.log('opened stream for timeline', timelineName)
},
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onClose () {
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console.log('closed stream for timeline', timelineName)
},
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onReconnect () {
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console.log('reconnected stream for timeline', timelineName)
}
})
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}