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/*
* SPDX-FileCopyrightText: syuilo and other misskey contributors
* SPDX-License-Identifier: AGPL-3.0-only
*/
import { Inject, Injectable } from '@nestjs/common';
import * as Redis from 'ioredis';
import type { MiNote } from '@/models/_.js';
import { DI } from '@/di-symbols.js';
import { bindThis } from '@/decorators.js';
const GLOBAL_NOTES_RANKING_WINDOW = 1000 * 60 * 60 * 24 * 3; // 3日ごと
@Injectable()
export class FeaturedService {
constructor(
@Inject(DI.redis)
private redisClient: Redis.Redis,
) {
}
@bindThis
private getCurrentPerUserFriendRankingWindow(): number {
const passed = new Date().getTime() - new Date(new Date().getFullYear(), 0, 1).getTime();
return Math.floor(passed / (1000 * 60 * 60 * 24 * 7)); // 1週間ごと
}
@bindThis
private getCurrentGlobalNotesRankingWindow(): number {
const passed = new Date().getTime() - new Date(new Date().getFullYear(), 0, 1).getTime();
return Math.floor(passed / GLOBAL_NOTES_RANKING_WINDOW);
}
@bindThis
public async updateGlobalNotesRanking(noteId: MiNote['id'], score = 1): Promise<void> {
// TODO: フォロワー数の多い人が常にランキング上位になるのを防ぎたい
const currentWindow = this.getCurrentGlobalNotesRankingWindow();
const redisTransaction = this.redisClient.multi();
redisTransaction.zincrby(
`featuredGlobalNotesRanking:${currentWindow}`,
score.toString(),
noteId);
redisTransaction.expire(
`featuredGlobalNotesRanking:${currentWindow}`,
(GLOBAL_NOTES_RANKING_WINDOW * 3) / 1000,
'NX'); // "NX -- Set expiry only when the key has no expiry" = 有効期限がないときだけ設定
await redisTransaction.exec();
}
@bindThis
public async updateInChannelNotesRanking(noteId: MiNote['id'], channelId: MiNote['channelId'], score = 1): Promise<void> {
const currentWindow = this.getCurrentGlobalNotesRankingWindow();
const redisTransaction = this.redisClient.multi();
redisTransaction.zincrby(
`featuredInChannelNotesRanking:${channelId}:${currentWindow}`,
score.toString(),
noteId);
redisTransaction.expire(
`featuredInChannelNotesRanking:${channelId}:${currentWindow}`,
(GLOBAL_NOTES_RANKING_WINDOW * 3) / 1000,
'NX'); // "NX -- Set expiry only when the key has no expiry" = 有効期限がないときだけ設定
await redisTransaction.exec();
}
@bindThis
public async getGlobalNotesRanking(limit: number): Promise<MiNote['id'][]> {
const currentWindow = this.getCurrentGlobalNotesRankingWindow();
const previousWindow = currentWindow - 1;
const [currentRankingResult, previousRankingResult] = await Promise.all([
this.redisClient.zrange(
`featuredGlobalNotesRanking:${currentWindow}`, 0, limit, 'REV', 'WITHSCORES'),
this.redisClient.zrange(
`featuredGlobalNotesRanking:${previousWindow}`, 0, limit, 'REV', 'WITHSCORES'),
]);
const ranking = new Map<MiNote['id'], number>();
for (let i = 0; i < currentRankingResult.length; i += 2) {
const noteId = currentRankingResult[i];
const score = parseInt(currentRankingResult[i + 1], 10);
ranking.set(noteId, score);
}
for (let i = 0; i < previousRankingResult.length; i += 2) {
const noteId = previousRankingResult[i];
const score = parseInt(previousRankingResult[i + 1], 10);
const exist = ranking.get(noteId);
if (exist != null) {
ranking.set(noteId, (exist + score) / 2);
} else {
ranking.set(noteId, score);
}
}
return Array.from(ranking.keys());
}
@bindThis
public async getInChannelNotesRanking(channelId: MiNote['channelId'], limit: number): Promise<MiNote['id'][]> {
const currentWindow = this.getCurrentGlobalNotesRankingWindow();
const previousWindow = currentWindow - 1;
const [currentRankingResult, previousRankingResult] = await Promise.all([
this.redisClient.zrange(
`featuredInChannelNotesRanking:${channelId}:${currentWindow}`, 0, limit, 'REV', 'WITHSCORES'),
this.redisClient.zrange(
`featuredInChannelNotesRanking:${channelId}:${previousWindow}`, 0, limit, 'REV', 'WITHSCORES'),
]);
const ranking = new Map<MiNote['id'], number>();
for (let i = 0; i < currentRankingResult.length; i += 2) {
const noteId = currentRankingResult[i];
const score = parseInt(currentRankingResult[i + 1], 10);
ranking.set(noteId, score);
}
for (let i = 0; i < previousRankingResult.length; i += 2) {
const noteId = previousRankingResult[i];
const score = parseInt(previousRankingResult[i + 1], 10);
const exist = ranking.get(noteId);
if (exist != null) {
ranking.set(noteId, (exist + score) / 2);
} else {
ranking.set(noteId, score);
}
}
return Array.from(ranking.keys());
}
}
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