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refactor(frontend): improve pagination implementation
This commit is contained in:
syuilo
322
packages/frontend/src/utility/paginator.ts
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322
packages/frontend/src/utility/paginator.ts
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/*
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* SPDX-FileCopyrightText: syuilo and misskey-project
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* SPDX-License-Identifier: AGPL-3.0-only
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*/
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import { ref, shallowRef, triggerRef } from 'vue';
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import * as Misskey from 'misskey-js';
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import type { ComputedRef, DeepReadonly, Ref, ShallowRef } from 'vue';
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import { misskeyApi } from '@/utility/misskey-api.js';
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const MAX_ITEMS = 30;
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const MAX_QUEUE_ITEMS = 100;
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const FIRST_FETCH_LIMIT = 15;
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const SECOND_FETCH_LIMIT = 30;
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export type MisskeyEntity = {
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id: string;
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createdAt: string;
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_shouldInsertAd_?: boolean;
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[x: string]: any;
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};
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export class Paginator<Endpoint extends keyof Misskey.Endpoints = keyof Misskey.Endpoints, T extends { id: string; } = (Misskey.Endpoints[Endpoint]['res'] extends (infer I)[] ? I extends { id: string } ? I : { id: string } : { id: string })> {
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/**
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* 外部から直接操作しないでください
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*/
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public items: ShallowRef<T[]> | Ref<T[]>;
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public queuedAheadItemsCount = ref(0);
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public fetching = ref(true);
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public fetchingOlder = ref(false);
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public fetchingNewer = ref(false);
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public canFetchOlder = ref(false);
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public canSearch = false;
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public error = ref(false);
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private endpoint: Endpoint;
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private limit: number;
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private params: Misskey.Endpoints[Endpoint]['req'] | (() => Misskey.Endpoints[Endpoint]['req']);
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public computedParams: ComputedRef<Misskey.Endpoints[Endpoint]['req']> | null;
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public initialId: MisskeyEntity['id'] | null = null;
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public initialDate: number | null = null;
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public initialDirection: 'newer' | 'older';
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private offsetMode: boolean;
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public noPaging: boolean;
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public searchQuery = ref<null | string>('');
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private searchParamName: string;
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private canFetchDetection: 'safe' | 'limit' | null = null;
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private aheadQueue: T[] = [];
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private useShallowRef: boolean;
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// 配列内の要素をどのような順序で並べるか
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// newest: 新しいものが先頭 (default)
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// oldest: 古いものが先頭
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// NOTE: このようなプロパティを用意してこっち側で並びを管理せずに、Setで持っておき参照者側が好きに並び変えるような設計の方がすっきりしそうなものの、Vueのレンダリングのたびに並び替え処理が発生することになったりしそうでパフォーマンス上の懸念がある
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public order: Ref<'newest' | 'oldest'>;
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constructor(endpoint: Endpoint, props: {
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limit?: number;
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params?: Misskey.Endpoints[Endpoint]['req'] | (() => Misskey.Endpoints[Endpoint]['req']);
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computedParams?: ComputedRef<Misskey.Endpoints[Endpoint]['req']>;
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/**
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* 検索APIのような、ページング不可なエンドポイントを利用する場合
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* (そのようなAPIをこの関数で使うのは若干矛盾してるけど)
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*/
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noPaging?: boolean;
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offsetMode?: boolean;
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initialId?: MisskeyEntity['id'];
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initialDate?: number | null;
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initialDirection?: 'newer' | 'older';
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order?: 'newest' | 'oldest';
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// 一部のAPIはさらに遡れる場合でもパフォーマンス上の理由でlimit以下の結果を返す場合があり、その場合はsafe、それ以外はlimitにすることを推奨
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canFetchDetection?: 'safe' | 'limit';
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useShallowRef?: boolean;
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canSearch?: boolean;
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searchParamName?: keyof Misskey.Endpoints[Endpoint]['req'];
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}) {
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this.endpoint = endpoint;
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this.useShallowRef = props.useShallowRef ?? false;
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this.items = this.useShallowRef ? shallowRef([] as T[]) : ref([] as T[]);
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this.limit = props.limit ?? FIRST_FETCH_LIMIT;
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this.params = props.params ?? {};
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this.computedParams = props.computedParams ?? null;
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this.order = ref(props.order ?? 'newest');
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this.initialId = props.initialId ?? null;
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this.initialDate = props.initialDate ?? null;
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this.initialDirection = props.initialDirection ?? 'older';
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this.canFetchDetection = props.canFetchDetection ?? null;
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this.noPaging = props.noPaging ?? false;
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this.offsetMode = props.offsetMode ?? false;
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this.canSearch = props.canSearch ?? false;
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this.searchParamName = props.searchParamName ?? 'search';
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this.getNewestId = this.getNewestId.bind(this);
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this.getOldestId = this.getOldestId.bind(this);
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this.init = this.init.bind(this);
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this.reload = this.reload.bind(this);
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this.fetchOlder = this.fetchOlder.bind(this);
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this.fetchNewer = this.fetchNewer.bind(this);
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this.unshiftItems = this.unshiftItems.bind(this);
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this.pushItems = this.pushItems.bind(this);
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this.prepend = this.prepend.bind(this);
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this.enqueue = this.enqueue.bind(this);
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this.releaseQueue = this.releaseQueue.bind(this);
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this.removeItem = this.removeItem.bind(this);
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this.updateItem = this.updateItem.bind(this);
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}
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private getNewestId(): string | null | undefined {
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// 様々な要因により並び順は保証されないのでソートが必要
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if (this.aheadQueue.length > 0) {
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return this.aheadQueue.map(x => x.id).sort().at(-1);
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}
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return this.items.value.map(x => x.id).sort().at(-1);
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}
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private getOldestId(): string | null | undefined {
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// 様々な要因により並び順は保証されないのでソートが必要
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return this.items.value.map(x => x.id).sort().at(0);
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}
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public async init(): Promise<void> {
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this.items.value = [];
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this.aheadQueue = [];
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this.queuedAheadItemsCount.value = 0;
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this.fetching.value = true;
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await misskeyApi<T[]>(this.endpoint, {
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...(typeof this.params === 'function' ? this.params() : this.params),
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...(this.computedParams ? this.computedParams.value : {}),
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...(this.searchQuery.value != null && this.searchQuery.value.trim() !== '' ? { [this.searchParamName]: this.searchQuery.value } : {}),
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limit: this.limit ?? FIRST_FETCH_LIMIT,
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allowPartial: true,
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...((this.initialId == null && this.initialDate == null) && this.initialDirection === 'newer' ? {
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sinceId: '0',
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} : this.initialDirection === 'newer' ? {
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sinceId: this.initialId ?? undefined,
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sinceDate: this.initialDate ?? undefined,
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} : (this.initialId || this.initialDate) && this.initialDirection === 'older' ? {
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untilId: this.initialId ?? undefined,
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untilDate: this.initialDate ?? undefined,
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} : {}),
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}).then(res => {
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// 逆順で返ってくるので
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if ((this.initialId || this.initialDate) && this.initialDirection === 'newer') {
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res.reverse();
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}
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for (let i = 0; i < res.length; i++) {
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const item = res[i];
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if (i === 3) item._shouldInsertAd_ = true;
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}
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this.pushItems(res);
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if (this.canFetchDetection === 'limit') {
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if (res.length < FIRST_FETCH_LIMIT) {
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this.canFetchOlder.value = false;
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} else {
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this.canFetchOlder.value = true;
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}
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} else if (this.canFetchDetection === 'safe' || this.canFetchDetection == null) {
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if (res.length === 0 || this.noPaging) {
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this.canFetchOlder.value = false;
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} else {
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this.canFetchOlder.value = true;
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}
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}
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this.error.value = false;
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this.fetching.value = false;
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}, err => {
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this.error.value = true;
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this.fetching.value = false;
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});
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}
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public reload(): Promise<void> {
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return this.init();
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}
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public async fetchOlder(): Promise<void> {
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if (!this.canFetchOlder.value || this.fetching.value || this.fetchingOlder.value || this.items.value.length === 0) return;
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this.fetchingOlder.value = true;
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await misskeyApi<T[]>(this.endpoint, {
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...(typeof this.params === 'function' ? this.params() : this.params),
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...(this.computedParams ? this.computedParams.value : {}),
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...(this.searchQuery.value != null && this.searchQuery.value.trim() !== '' ? { [this.searchParamName]: this.searchQuery.value } : {}),
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limit: SECOND_FETCH_LIMIT,
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...(this.offsetMode ? {
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offset: this.items.value.length,
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} : {
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untilId: this.getOldestId(),
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}),
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}).then(res => {
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for (let i = 0; i < res.length; i++) {
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const item = res[i];
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if (i === 10) item._shouldInsertAd_ = true;
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}
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this.pushItems(res);
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if (this.canFetchDetection === 'limit') {
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if (res.length < FIRST_FETCH_LIMIT) {
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this.canFetchOlder.value = false;
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} else {
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this.canFetchOlder.value = true;
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}
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} else if (this.canFetchDetection === 'safe' || this.canFetchDetection == null) {
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if (res.length === 0) {
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this.canFetchOlder.value = false;
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} else {
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this.canFetchOlder.value = true;
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}
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}
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}).finally(() => {
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this.fetchingOlder.value = false;
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});
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}
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public async fetchNewer(options: {
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toQueue?: boolean;
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} = {}): Promise<void> {
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this.fetchingNewer.value = true;
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await misskeyApi<T[]>(this.endpoint, {
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...(typeof this.params === 'function' ? this.params() : this.params),
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...(this.computedParams ? this.computedParams.value : {}),
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...(this.searchQuery.value != null && this.searchQuery.value.trim() !== '' ? { [this.searchParamName]: this.searchQuery.value } : {}),
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limit: SECOND_FETCH_LIMIT,
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...(this.offsetMode ? {
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offset: this.items.value.length,
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} : {
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sinceId: this.getNewestId(),
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}),
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}).then(res => {
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if (res.length === 0) return; // これやらないと余計なre-renderが走る
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if (options.toQueue) {
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this.aheadQueue.unshift(...res.toReversed());
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if (this.aheadQueue.length > MAX_QUEUE_ITEMS) {
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this.aheadQueue = this.aheadQueue.slice(0, MAX_QUEUE_ITEMS);
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}
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this.queuedAheadItemsCount.value = this.aheadQueue.length;
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} else {
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if (this.order.value === 'oldest') {
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this.pushItems(res);
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} else {
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this.unshiftItems(res.toReversed());
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}
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}
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}).finally(() => {
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this.fetchingNewer.value = false;
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});
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}
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public trim(trigger = true): void {
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if (this.items.value.length >= MAX_ITEMS) this.canFetchOlder.value = true;
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this.items.value = this.items.value.slice(0, MAX_ITEMS);
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if (this.useShallowRef && trigger) triggerRef(this.items);
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}
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public unshiftItems(newItems: T[]): void {
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if (newItems.length === 0) return; // これやらないと余計なre-renderが走る
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this.items.value.unshift(...newItems.filter(x => !this.items.value.some(y => y.id === x.id))); // ストリーミングやポーリングのタイミングによっては重複することがあるため
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this.trim(false);
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if (this.useShallowRef) triggerRef(this.items);
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}
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public pushItems(oldItems: T[]): void {
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if (oldItems.length === 0) return; // これやらないと余計なre-renderが走る
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this.items.value.push(...oldItems);
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if (this.useShallowRef) triggerRef(this.items);
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}
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public prepend(item: T): void {
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if (this.items.value.some(x => x.id === item.id)) return;
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this.items.value.unshift(item);
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this.trim(false);
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if (this.useShallowRef) triggerRef(this.items);
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}
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public enqueue(item: T): void {
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this.aheadQueue.unshift(item);
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if (this.aheadQueue.length > MAX_QUEUE_ITEMS) {
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this.aheadQueue.pop();
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}
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this.queuedAheadItemsCount.value = this.aheadQueue.length;
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}
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public releaseQueue(): void {
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if (this.aheadQueue.length === 0) return; // これやらないと余計なre-renderが走る
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this.unshiftItems(this.aheadQueue);
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this.aheadQueue = [];
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this.queuedAheadItemsCount.value = 0;
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}
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public removeItem(id: string): void {
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// TODO: queueからも消す
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const index = this.items.value.findIndex(x => x.id === id);
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if (index !== -1) {
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this.items.value.splice(index, 1);
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if (this.useShallowRef) triggerRef(this.items);
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}
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}
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public updateItem(id: string, updator: (item: T) => T): void {
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// TODO: queueのも更新
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const index = this.items.value.findIndex(x => x.id === id);
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if (index !== -1) {
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const item = this.items.value[index]!;
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this.items.value[index] = updator(item);
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if (this.useShallowRef) triggerRef(this.items);
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}
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}
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}
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