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/*
* SPDX-FileCopyrightText: syuilo and misskey-project
* SPDX-License-Identifier: AGPL-3.0-only
*/
import { Inject, Injectable } from '@nestjs/common';
import * as Redis from 'ioredis';
import { DI } from '@/di-symbols.js';
import type { MiNote } from '@/models/Note.js';
import { bindThis } from '@/decorators.js';
import type { MiUser, NotesRepository } from '@/models/_.js';
import type { Config } from '@/config.js';
import { PER_NOTE_REACTION_USER_PAIR_CACHE_MAX } from '@/const.js';
const REDIS_DELTA_PREFIX = 'reactionsBufferDeltas';
const REDIS_PAIR_PREFIX = 'reactionsBufferPairs';
@Injectable()
export class ReactionsBufferingService {
constructor(
@Inject(DI.config)
private config: Config,
@Inject(DI.redisForReactions)
private redisForReactions: Redis.Redis, // TODO: 専用のRedisインスタンスにする
@Inject(DI.notesRepository)
private notesRepository: NotesRepository,
) {
}
@bindThis
public async create(noteId: MiNote['id'], userId: MiUser['id'], reaction: string, currentPairs: string[]): Promise<void> {
const pipeline = this.redisForReactions.pipeline();
pipeline.hincrby(`${REDIS_DELTA_PREFIX}:${noteId}`, reaction, 1);
for (let i = 0; i < currentPairs.length; i++) {
pipeline.zadd(`${REDIS_PAIR_PREFIX}:${noteId}`, i, currentPairs[i]);
}
pipeline.zadd(`${REDIS_PAIR_PREFIX}:${noteId}`, Date.now(), `${userId}/${reaction}`);
pipeline.zremrangebyrank(`${REDIS_PAIR_PREFIX}:${noteId}`, 0, -(PER_NOTE_REACTION_USER_PAIR_CACHE_MAX + 1));
await pipeline.exec();
}
@bindThis
public async delete(noteId: MiNote['id'], userId: MiUser['id'], reaction: string): Promise<void> {
const pipeline = this.redisForReactions.pipeline();
pipeline.hincrby(`${REDIS_DELTA_PREFIX}:${noteId}`, reaction, -1);
pipeline.zrem(`${REDIS_PAIR_PREFIX}:${noteId}`, `${userId}/${reaction}`);
// TODO: 「消した要素一覧」も持っておかないとcreateされた時に上書きされて復活する
await pipeline.exec();
}
@bindThis
public async get(noteId: MiNote['id']): Promise<{
deltas: Record<string, number>;
pairs: ([MiUser['id'], string])[];
}> {
const pipeline = this.redisForReactions.pipeline();
pipeline.hgetall(`${REDIS_DELTA_PREFIX}:${noteId}`);
pipeline.zrange(`${REDIS_PAIR_PREFIX}:${noteId}`, 0, -1);
const results = await pipeline.exec();
const resultDeltas = results![0][1] as Record<string, string>;
const resultPairs = results![1][1] as string[];
const deltas = {} as Record<string, number>;
for (const [name, count] of Object.entries(resultDeltas)) {
deltas[name] = parseInt(count);
}
const pairs = resultPairs.map(x => x.split('/') as [MiUser['id'], string]);
return {
deltas,
pairs,
};
}
@bindThis
public async getMany(noteIds: MiNote['id'][]): Promise<Map<MiNote['id'], {
deltas: Record<string, number>;
pairs: ([MiUser['id'], string])[];
}>> {
const map = new Map<MiNote['id'], {
deltas: Record<string, number>;
pairs: ([MiUser['id'], string])[];
}>();
const pipeline = this.redisForReactions.pipeline();
for (const noteId of noteIds) {
pipeline.hgetall(`${REDIS_DELTA_PREFIX}:${noteId}`);
pipeline.zrange(`${REDIS_PAIR_PREFIX}:${noteId}`, 0, -1);
}
const results = await pipeline.exec();
const opsForEachNotes = 2;
for (let i = 0; i < noteIds.length; i++) {
const noteId = noteIds[i];
const resultDeltas = results![i * opsForEachNotes][1] as Record<string, string>;
const resultPairs = results![i * opsForEachNotes + 1][1] as string[];
const deltas = {} as Record<string, number>;
for (const [name, count] of Object.entries(resultDeltas)) {
deltas[name] = parseInt(count);
}
const pairs = resultPairs.map(x => x.split('/') as [MiUser['id'], string]);
map.set(noteId, {
deltas,
pairs,
});
}
return map;
}
// TODO: scanは重い可能性があるので、別途 bufferedNoteIds を直接Redis上に持っておいてもいいかもしれない
@bindThis
public async bake(): Promise<void> {
const bufferedNoteIds = [];
let cursor = '0';
do {
// https://github.com/redis/ioredis#transparent-key-prefixing
const result = await this.redisForReactions.scan(
cursor,
'MATCH',
`${this.config.redis.prefix}:${REDIS_DELTA_PREFIX}:*`,
'COUNT',
'1000');
cursor = result[0];
bufferedNoteIds.push(...result[1].map(x => x.replace(`${this.config.redis.prefix}:${REDIS_DELTA_PREFIX}:`, '')));
} while (cursor !== '0');
const bufferedMap = await this.getMany(bufferedNoteIds);
// clear
const pipeline = this.redisForReactions.pipeline();
for (const noteId of bufferedNoteIds) {
pipeline.del(`${REDIS_DELTA_PREFIX}:${noteId}`);
pipeline.del(`${REDIS_PAIR_PREFIX}:${noteId}`);
}
await pipeline.exec();
// TODO: SQL一個にまとめたい
for (const [noteId, buffered] of bufferedMap) {
const sql = Object.entries(buffered.deltas)
.map(([reaction, count]) =>
`jsonb_set("reactions", '{${reaction}}', (COALESCE("reactions"->>'${reaction}', '0')::int + ${count})::text::jsonb)`)
.join(' || ');
this.notesRepository.createQueryBuilder().update()
.set({
reactions: () => sql,
reactionAndUserPairCache: buffered.pairs.map(x => x.join('/')),
})
.where('id = :id', { id: noteId })
.execute();
}
}
}
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