647 lines
16 KiB
TypeScript
647 lines
16 KiB
TypeScript
import {makeAutoObservable, runInAction} from 'mobx'
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import {Record as PostRecord} from '../../third-party/api/src/client/types/app/bsky/feed/post'
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import * as GetTimeline from '../../third-party/api/src/client/types/app/bsky/feed/getTimeline'
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import * as ActorRef from '../../third-party/api/src/client/types/app/bsky/actor/ref'
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import * as GetAuthorFeed from '../../third-party/api/src/client/types/app/bsky/feed/getAuthorFeed'
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import {PostThreadViewModel} from './post-thread-view'
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import {AtUri} from '../../third-party/uri'
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import {RootStoreModel} from './root-store'
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import * as apilib from '../lib/api'
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import {cleanError} from '../../lib/strings'
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import {isObj, hasProp} from '../lib/type-guards'
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const PAGE_SIZE = 30
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let _idCounter = 0
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type FeedItem = GetTimeline.FeedItem | GetAuthorFeed.FeedItem
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type FeedItemWithThreadMeta = FeedItem & {
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_isThreadParent?: boolean
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_isThreadChildElided?: boolean
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_isThreadChild?: boolean
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}
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export class FeedItemMyStateModel {
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repost?: string
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upvote?: string
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downvote?: string
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constructor() {
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makeAutoObservable(this)
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}
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}
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export class FeedItemModel implements GetTimeline.FeedItem {
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// ui state
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_reactKey: string = ''
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_isThreadParent: boolean = false
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_isThreadChildElided: boolean = false
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_isThreadChild: boolean = false
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// data
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uri: string = ''
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cid: string = ''
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author: ActorRef.WithInfo = {
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did: '',
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handle: '',
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displayName: '',
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declaration: {cid: '', actorType: ''},
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avatar: undefined,
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}
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repostedBy?: ActorRef.WithInfo
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trendedBy?: ActorRef.WithInfo
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record: Record<string, unknown> = {}
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embed?: GetTimeline.FeedItem['embed']
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replyCount: number = 0
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repostCount: number = 0
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upvoteCount: number = 0
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downvoteCount: number = 0
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indexedAt: string = ''
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myState = new FeedItemMyStateModel()
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// additional data
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additionalParentPost?: PostThreadViewModel
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constructor(
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public rootStore: RootStoreModel,
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reactKey: string,
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v: FeedItemWithThreadMeta,
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) {
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makeAutoObservable(this, {rootStore: false})
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this._reactKey = reactKey
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this.copy(v)
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this._isThreadParent = v._isThreadParent || false
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this._isThreadChild = v._isThreadChild || false
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this._isThreadChildElided = v._isThreadChildElided || false
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}
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copy(v: GetTimeline.FeedItem | GetAuthorFeed.FeedItem) {
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this.uri = v.uri
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this.cid = v.cid
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this.author = v.author
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this.repostedBy = v.repostedBy
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this.trendedBy = v.trendedBy
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this.record = v.record
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this.embed = v.embed
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this.replyCount = v.replyCount
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this.repostCount = v.repostCount
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this.upvoteCount = v.upvoteCount
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this.downvoteCount = v.downvoteCount
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this.indexedAt = v.indexedAt
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if (v.myState) {
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this.myState.upvote = v.myState.upvote
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this.myState.downvote = v.myState.downvote
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this.myState.repost = v.myState.repost
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}
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}
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async toggleUpvote() {
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const wasUpvoted = !!this.myState.upvote
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const wasDownvoted = !!this.myState.downvote
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const res = await this.rootStore.api.app.bsky.feed.setVote({
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subject: {
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uri: this.uri,
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cid: this.cid,
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},
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direction: wasUpvoted ? 'none' : 'up',
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})
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runInAction(() => {
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if (wasDownvoted) {
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this.downvoteCount--
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}
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if (wasUpvoted) {
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this.upvoteCount--
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} else {
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this.upvoteCount++
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}
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this.myState.upvote = res.data.upvote
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this.myState.downvote = res.data.downvote
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})
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}
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async toggleDownvote() {
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const wasUpvoted = !!this.myState.upvote
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const wasDownvoted = !!this.myState.downvote
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const res = await this.rootStore.api.app.bsky.feed.setVote({
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subject: {
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uri: this.uri,
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cid: this.cid,
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},
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direction: wasDownvoted ? 'none' : 'down',
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})
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runInAction(() => {
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if (wasUpvoted) {
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this.upvoteCount--
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}
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if (wasDownvoted) {
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this.downvoteCount--
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} else {
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this.downvoteCount++
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}
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this.myState.upvote = res.data.upvote
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this.myState.downvote = res.data.downvote
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})
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}
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async toggleRepost() {
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if (this.myState.repost) {
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await apilib.unrepost(this.rootStore, this.myState.repost)
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runInAction(() => {
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this.repostCount--
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this.myState.repost = undefined
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})
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} else {
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const res = await apilib.repost(this.rootStore, this.uri, this.cid)
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runInAction(() => {
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this.repostCount++
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this.myState.repost = res.uri
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})
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}
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}
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async delete() {
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await this.rootStore.api.app.bsky.feed.post.delete({
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did: this.author.did,
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rkey: new AtUri(this.uri).rkey,
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})
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}
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get needsAdditionalData() {
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if (
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(this.record as PostRecord).reply?.parent?.uri &&
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!this._isThreadChild
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) {
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return !this.additionalParentPost
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}
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return false
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}
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async fetchAdditionalData() {
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if (!this.needsAdditionalData) {
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return
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}
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this.additionalParentPost = new PostThreadViewModel(this.rootStore, {
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uri: (this.record as PostRecord).reply?.parent.uri,
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depth: 0,
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})
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await this.additionalParentPost.setup().catch(e => {
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console.error('Failed to load post needed by notification', e)
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})
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}
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}
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export class FeedModel {
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// state
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isLoading = false
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isRefreshing = false
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hasNewLatest = false
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hasLoaded = false
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error = ''
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params: GetTimeline.QueryParams | GetAuthorFeed.QueryParams
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hasMore = true
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loadMoreCursor: string | undefined
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pollCursor: string | undefined
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_loadPromise: Promise<void> | undefined
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_loadMorePromise: Promise<void> | undefined
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_loadLatestPromise: Promise<void> | undefined
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_updatePromise: Promise<void> | undefined
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// data
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feed: FeedItemModel[] = []
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constructor(
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public rootStore: RootStoreModel,
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public feedType: 'home' | 'author',
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params: GetTimeline.QueryParams | GetAuthorFeed.QueryParams,
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) {
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makeAutoObservable(
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this,
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{
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rootStore: false,
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params: false,
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loadMoreCursor: false,
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_loadPromise: false,
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_loadMorePromise: false,
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_loadLatestPromise: false,
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_updatePromise: false,
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},
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{autoBind: true},
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)
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this.params = params
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}
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get hasContent() {
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return this.feed.length !== 0
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}
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get hasError() {
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return this.error !== ''
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}
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get isEmpty() {
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return this.hasLoaded && !this.hasContent
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}
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get nonReplyFeed() {
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return this.feed.filter(
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post =>
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!post.record.reply || // not a reply
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!!post.repostedBy || // or a repost
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!!post.trendedBy || // or a trend
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post._isThreadParent || // but allow if it's a thread by the user
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post._isThreadChild,
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)
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}
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setHasNewLatest(v: boolean) {
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this.hasNewLatest = v
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}
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// public api
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// =
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/**
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* Load for first render
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*/
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async setup(isRefreshing = false) {
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if (isRefreshing) {
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this.isRefreshing = true // set optimistically for UI
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}
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if (this._loadPromise) {
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return this._loadPromise
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}
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await this._pendingWork()
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this.setHasNewLatest(false)
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this._loadPromise = this._initialLoad(isRefreshing)
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await this._loadPromise
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this._loadPromise = undefined
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}
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/**
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* Reset and load
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*/
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async refresh() {
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await this.setup(true)
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}
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/**
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* Load more posts to the end of the feed
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*/
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async loadMore() {
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if (this._loadMorePromise) {
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return this._loadMorePromise
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}
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await this._pendingWork()
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this._loadMorePromise = this._loadMore()
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await this._loadMorePromise
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this._loadMorePromise = undefined
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}
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/**
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* Load more posts to the start of the feed
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*/
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async loadLatest() {
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if (this._loadLatestPromise) {
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return this._loadLatestPromise
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}
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await this._pendingWork()
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this.setHasNewLatest(false)
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this._loadLatestPromise = this._loadLatest()
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await this._loadLatestPromise
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this._loadLatestPromise = undefined
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}
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/**
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* Update content in-place
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*/
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async update() {
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if (this._updatePromise) {
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return this._updatePromise
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}
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await this._pendingWork()
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this._updatePromise = this._update()
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await this._updatePromise
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this._updatePromise = undefined
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}
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/**
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* Check if new postrs are available
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*/
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async checkForLatest() {
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if (this.hasNewLatest) {
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return
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}
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await this._pendingWork()
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const res = await this._getFeed({limit: 1})
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const currentLatestUri = this.pollCursor
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const receivedLatestUri = res.data.feed[0]
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? res.data.feed[0].uri
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: undefined
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const hasNewLatest = Boolean(
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receivedLatestUri &&
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(this.feed.length === 0 || receivedLatestUri !== currentLatestUri),
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)
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this.setHasNewLatest(hasNewLatest)
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}
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// state transitions
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// =
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private _xLoading(isRefreshing = false) {
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this.isLoading = true
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this.isRefreshing = isRefreshing
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this.error = ''
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}
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private _xIdle(err: string = '') {
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this.isLoading = false
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this.isRefreshing = false
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this.hasLoaded = true
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this.error = cleanError(err)
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}
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// loader functions
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// =
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private async _pendingWork() {
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if (this._loadPromise) {
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await this._loadPromise
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}
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if (this._loadMorePromise) {
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await this._loadMorePromise
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}
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if (this._loadLatestPromise) {
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await this._loadLatestPromise
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}
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if (this._updatePromise) {
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await this._updatePromise
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}
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}
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private async _initialLoad(isRefreshing = false) {
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this._xLoading(isRefreshing)
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try {
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const res = await this._getFeed({limit: PAGE_SIZE})
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await this._replaceAll(res)
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this._xIdle()
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} catch (e: any) {
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this._xIdle(e.toString())
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}
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}
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private async _loadLatest() {
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this._xLoading()
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try {
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const res = await this._getFeed({limit: PAGE_SIZE})
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await this._prependAll(res)
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this._xIdle()
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} catch (e: any) {
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this._xIdle(e.toString())
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}
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}
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private async _loadMore() {
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if (!this.hasMore || this.hasError) {
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return
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}
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this._xLoading()
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try {
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const res = await this._getFeed({
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before: this.loadMoreCursor,
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limit: PAGE_SIZE,
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})
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await this._appendAll(res)
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this._xIdle()
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} catch (e: any) {
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this._xIdle(`Failed to load feed: ${e.toString()}`)
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}
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}
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private async _update() {
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if (!this.feed.length) {
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return
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}
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this._xLoading()
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let numToFetch = this.feed.length
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let cursor = undefined
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try {
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do {
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const res: GetTimeline.Response = await this._getFeed({
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before: cursor,
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limit: Math.min(numToFetch, 100),
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})
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if (res.data.feed.length === 0) {
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break // sanity check
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}
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this._updateAll(res)
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numToFetch -= res.data.feed.length
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cursor = this.feed[res.data.feed.length - 1].indexedAt
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console.log(numToFetch, cursor, res.data.feed.length)
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} while (numToFetch > 0)
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this._xIdle()
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} catch (e: any) {
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this._xIdle(`Failed to update feed: ${e.toString()}`)
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}
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}
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private async _replaceAll(
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res: GetTimeline.Response | GetAuthorFeed.Response,
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) {
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this.pollCursor = res.data.feed[0]?.uri
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return this._appendAll(res, true)
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}
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private async _appendAll(
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res: GetTimeline.Response | GetAuthorFeed.Response,
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replace = false,
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) {
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this.loadMoreCursor = res.data.cursor
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this.hasMore = !!this.loadMoreCursor
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const reorgedFeed = preprocessFeed(res.data.feed)
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const promises = []
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const toAppend: FeedItemModel[] = []
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for (const item of reorgedFeed) {
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const itemModel = new FeedItemModel(
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this.rootStore,
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`item-${_idCounter++}`,
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item,
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)
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if (itemModel.needsAdditionalData) {
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promises.push(
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itemModel.fetchAdditionalData().catch(e => {
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console.error('Failure during feed-view _appendAll()', e)
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}),
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)
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}
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toAppend.push(itemModel)
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}
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await Promise.all(promises)
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runInAction(() => {
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if (replace) {
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this.feed = toAppend
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} else {
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this.feed = this.feed.concat(toAppend)
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}
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})
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}
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private async _prependAll(
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res: GetTimeline.Response | GetAuthorFeed.Response,
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) {
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this.pollCursor = res.data.feed[0]?.uri
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const promises = []
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const toPrepend: FeedItemModel[] = []
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for (const item of res.data.feed) {
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if (this.feed.find(item2 => item2.uri === item.uri)) {
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break // stop here - we've hit a post we already have
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}
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const itemModel = new FeedItemModel(
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this.rootStore,
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`item-${_idCounter++}`,
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item,
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)
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if (itemModel.needsAdditionalData) {
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promises.push(
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itemModel.fetchAdditionalData().catch(e => {
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console.error('Failure during feed-view _prependAll()', e)
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}),
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)
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}
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toPrepend.push(itemModel)
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}
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await Promise.all(promises)
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runInAction(() => {
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this.feed = toPrepend.concat(this.feed)
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})
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}
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private _updateAll(res: GetTimeline.Response | GetAuthorFeed.Response) {
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for (const item of res.data.feed) {
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const existingItem = this.feed.find(
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// HACK: need to find the reposts and trends item, so we have to check for that -prf
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item2 =>
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item.uri === item2.uri &&
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item.repostedBy?.did === item2.repostedBy?.did &&
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item.trendedBy?.did === item2.trendedBy?.did,
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)
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if (existingItem) {
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existingItem.copy(item)
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}
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}
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}
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protected _getFeed(
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params: GetTimeline.QueryParams | GetAuthorFeed.QueryParams = {},
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): Promise<GetTimeline.Response | GetAuthorFeed.Response> {
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params = Object.assign({}, this.params, params)
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if (this.feedType === 'home') {
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return this.rootStore.api.app.bsky.feed.getTimeline(
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params as GetTimeline.QueryParams,
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)
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} else {
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return this.rootStore.api.app.bsky.feed.getAuthorFeed(
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params as GetAuthorFeed.QueryParams,
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)
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}
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}
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}
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interface Slice {
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index: number
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length: number
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}
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function preprocessFeed(feed: FeedItem[]): FeedItemWithThreadMeta[] {
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const reorg: FeedItemWithThreadMeta[] = []
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// phase one: identify threads and reorganize them into the feed so
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// that they are in order and marked as part of a thread
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for (let i = feed.length - 1; i >= 0; i--) {
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const item = feed[i] as FeedItemWithThreadMeta
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const selfReplyUri = getSelfReplyUri(item)
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if (selfReplyUri) {
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const parentIndex = reorg.findIndex(item2 => item2.uri === selfReplyUri)
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if (parentIndex !== -1 && !reorg[parentIndex]._isThreadParent) {
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|
reorg[parentIndex]._isThreadParent = true
|
|
item._isThreadChild = true
|
|
reorg.splice(parentIndex + 1, 0, item)
|
|
continue
|
|
}
|
|
}
|
|
reorg.unshift(item)
|
|
}
|
|
|
|
// phase two: identify the positions of the threads
|
|
let activeSlice = -1
|
|
let threadSlices: Slice[] = []
|
|
for (let i = 0; i < reorg.length; i++) {
|
|
const item = reorg[i] as FeedItemWithThreadMeta
|
|
if (activeSlice === -1) {
|
|
if (item._isThreadParent) {
|
|
activeSlice = i
|
|
}
|
|
} else {
|
|
if (!item._isThreadChild) {
|
|
threadSlices.push({index: activeSlice, length: i - activeSlice})
|
|
if (item._isThreadParent) {
|
|
activeSlice = i
|
|
} else {
|
|
activeSlice = -1
|
|
}
|
|
}
|
|
}
|
|
}
|
|
if (activeSlice !== -1) {
|
|
threadSlices.push({index: activeSlice, length: reorg.length - activeSlice})
|
|
}
|
|
|
|
// phase three: reorder the feed so that the timestamp of the
|
|
// last post in a thread establishes its ordering
|
|
for (const slice of threadSlices) {
|
|
const removed: FeedItemWithThreadMeta[] = reorg.splice(
|
|
slice.index,
|
|
slice.length,
|
|
)
|
|
const targetDate = new Date(removed[removed.length - 1].indexedAt)
|
|
let newIndex = reorg.findIndex(
|
|
item => new Date(item.indexedAt) < targetDate,
|
|
)
|
|
if (newIndex === -1) newIndex = 0
|
|
reorg.splice(newIndex, 0, ...removed)
|
|
slice.index = newIndex
|
|
}
|
|
|
|
// phase four: compress any threads that are longer than 3 posts
|
|
let removedCount = 0
|
|
for (const slice of threadSlices) {
|
|
if (slice.length > 3) {
|
|
reorg.splice(slice.index - removedCount + 1, slice.length - 3)
|
|
reorg[slice.index - removedCount]._isThreadChildElided = true
|
|
removedCount += slice.length - 3
|
|
}
|
|
}
|
|
|
|
return reorg
|
|
}
|
|
|
|
function getSelfReplyUri(
|
|
item: GetTimeline.FeedItem | GetAuthorFeed.FeedItem,
|
|
): string | undefined {
|
|
if (
|
|
isObj(item.record) &&
|
|
hasProp(item.record, 'reply') &&
|
|
isObj(item.record.reply) &&
|
|
hasProp(item.record.reply, 'parent') &&
|
|
isObj(item.record.reply.parent) &&
|
|
hasProp(item.record.reply.parent, 'uri') &&
|
|
typeof item.record.reply.parent.uri === 'string'
|
|
) {
|
|
if (new AtUri(item.record.reply.parent.uri).host === item.author.did) {
|
|
return item.record.reply.parent.uri
|
|
}
|
|
}
|
|
}
|