85 lines
3 KiB
TypeScript
85 lines
3 KiB
TypeScript
/*
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* SPDX-FileCopyrightText: syuilo and other misskey contributors
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* SPDX-License-Identifier: AGPL-3.0-only
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*/
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import { Inject, Injectable } from '@nestjs/common';
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import * as Redis from 'ioredis';
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import { DI } from '@/di-symbols.js';
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import { bindThis } from '@/decorators.js';
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import { IdService } from '@/core/IdService.js';
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@Injectable()
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export class FunoutTimelineService {
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constructor(
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@Inject(DI.redisForTimelines)
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private redisForTimelines: Redis.Redis,
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private idService: IdService,
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) {
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}
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@bindThis
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public push(tl: string, id: string, maxlen: number, pipeline: Redis.ChainableCommander) {
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// リモートから遅れて届いた(もしくは後から追加された)投稿日時が古い投稿が追加されるとページネーション時に問題を引き起こすため、
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// 3分以内に投稿されたものでない場合、Redisにある最古のIDより新しい場合のみ追加する
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if (this.idService.parse(id).date.getTime() > Date.now() - 1000 * 60 * 3) {
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pipeline.lpush('list:' + tl, id);
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if (Math.random() < 0.1) { // 10%の確率でトリム
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pipeline.ltrim('list:' + tl, 0, maxlen - 1);
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}
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} else {
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// 末尾のIDを取得
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this.redisForTimelines.lindex('list:' + tl, -1).then(lastId => {
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if (lastId == null || (this.idService.parse(id).date.getTime() > this.idService.parse(lastId).date.getTime())) {
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this.redisForTimelines.lpush('list:' + tl, id);
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} else {
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Promise.resolve();
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}
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});
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}
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}
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@bindThis
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public get(name: string, untilId?: string | null, sinceId?: string | null) {
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if (untilId && sinceId) {
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return this.redisForTimelines.lrange('list:' + name, 0, -1)
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.then(ids => ids.filter(id => id < untilId && id > sinceId).sort((a, b) => a > b ? -1 : 1));
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} else if (untilId) {
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return this.redisForTimelines.lrange('list:' + name, 0, -1)
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.then(ids => ids.filter(id => id < untilId).sort((a, b) => a > b ? -1 : 1));
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} else if (sinceId) {
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return this.redisForTimelines.lrange('list:' + name, 0, -1)
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.then(ids => ids.filter(id => id > sinceId).sort((a, b) => a < b ? -1 : 1));
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} else {
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return this.redisForTimelines.lrange('list:' + name, 0, -1)
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.then(ids => ids.sort((a, b) => a > b ? -1 : 1));
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}
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}
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@bindThis
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public getMulti(name: string[], untilId?: string | null, sinceId?: string | null): Promise<string[][]> {
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const pipeline = this.redisForTimelines.pipeline();
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for (const n of name) {
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pipeline.lrange('list:' + n, 0, -1);
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}
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return pipeline.exec().then(res => {
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if (res == null) return [];
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const tls = res.map(r => r[1] as string[]);
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return tls.map(ids =>
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(untilId && sinceId)
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? ids.filter(id => id < untilId && id > sinceId).sort((a, b) => a > b ? -1 : 1)
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: untilId
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? ids.filter(id => id < untilId).sort((a, b) => a > b ? -1 : 1)
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: sinceId
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? ids.filter(id => id > sinceId).sort((a, b) => a < b ? -1 : 1)
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: ids.sort((a, b) => a > b ? -1 : 1),
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);
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});
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}
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@bindThis
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public purge(name: string) {
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return this.redisForTimelines.del('list:' + name);
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}
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}
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