103 lines
3.3 KiB
JavaScript
103 lines
3.3 KiB
JavaScript
import Observable from 'core-js-pure/features/observable'
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import { observableToAsyncIterator } from '/services/misc.js'
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const LINK_RE = /<(.+?)>; rel="(\w+)"/gi
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function parseLinkHeader(link) {
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const links = {}
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for (const [ , url, name ] of link.matchAll(LINK_RE)) {
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links[name] = url
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}
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return links
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}
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export const hashtagStreamingObservable = (domain, hashtag) => {
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return new Observable(observer => {
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const onOpen = () => {
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console.log(`Streaming ${domain} #${hashtag} : open`)
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}
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const onStatus = event => {
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const status = JSON.parse(event.data)
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console.log(`Streaming ${domain} #${hashtag} : status ${status.id}`)
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observer.next(status)
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}
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const onError = error => {
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console.error(`Streaming ${domain} #${hashtag} : error`)
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console.error(error)
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observer.error(error)
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}
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const eventSource = new EventSource(`https://${domain}/api/v1/streaming/hashtag?tag=${hashtag}`)
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eventSource.addEventListener('open', onOpen)
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eventSource.addEventListener('update', onStatus)
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eventSource.addEventListener('error', onError)
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return () => {
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eventSource.removeEventListener('open', onOpen)
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eventSource.removeEventListener('update', onStatus)
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eventSource.removeEventListener('error', onError)
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}
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})
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}
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export async function* hashtagTimelineIterator (domain, hashtag) {
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let nextLink = `https://${domain}/api/v1/timelines/tag/${hashtag}?limit=40`
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while (nextLink) {
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const response = await fetch(nextLink)
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nextLink = response.headers.has('link')
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? parseLinkHeader(response.headers.get('link')).next
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: null
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const statuses = await response.json()
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console.log(`Timeline ${domain} #${hashtag} : fetched ${statuses.length} statuses`)
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yield* statuses
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}
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}
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export async function* hashtagIterator(domain, hashtag) {
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const newerIterator = observableToAsyncIterator(hashtagStreamingObservable(domain, hashtag))
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const olderIterator = hashtagTimelineIterator(domain, hashtag)
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const iterators = [newerIterator, olderIterator]
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const values = iterators.map(iterator => iterator.next())
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while (true) {
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const promises = values.map((promise, index) => promise.then(result => ({ index, result })))
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const { index, result: { done, value } } = await Promise.race(promises)
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values[index] = iterators[index].next()
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console.log(`Resolver ${domain} #${hashtag} : resolved with iterator ${index}`)
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yield value
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}
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}
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export async function* combinedIterator(iterators) {
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const values = iterators.map(iterator => iterator.next())
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while (true) {
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const promises = values.map((promise, index) => promise.then(result => ({ index, result })))
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const promisesValues = await Promise.all(promises)
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const sorted = promisesValues
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.sort((a, b) =>{
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new Date(a.result.value.status.created_at) - new Date(b.result.value.status.created_at)
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})
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const { index, result: { done, value } } = sorted[0]
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values[index] = iterators[index].next()
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console.log(`CombinedResolver : resolved with iterator ${index}`)
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yield value
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}
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}
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