2022-09-17 18:27:08 +00:00
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import { Inject, Injectable } from '@nestjs/common';
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import { DataSource } from 'typeorm';
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2022-09-20 17:35:49 +00:00
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import Redis from 'ioredis';
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2022-09-17 18:27:08 +00:00
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import { DI } from '@/di-symbols.js';
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import { Meta } from '@/models/entities/Meta.js';
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2022-09-20 17:52:19 +00:00
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import { GlobalEventService } from '@/core/GlobalEventService.js';
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2022-12-04 06:03:09 +00:00
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import { bindThis } from '@/decorators.js';
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2023-01-13 23:27:23 +00:00
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import { StreamMessages } from '@/server/api/stream/types.js';
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import type { OnApplicationShutdown } from '@nestjs/common';
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2022-09-17 18:27:08 +00:00
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@Injectable()
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export class MetaService implements OnApplicationShutdown {
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private cache: Meta | undefined;
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private intervalId: NodeJS.Timer;
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constructor(
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@Inject(DI.redisForSub)
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private redisForSub: Redis.Redis,
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@Inject(DI.db)
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private db: DataSource,
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private globalEventService: GlobalEventService,
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) {
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//this.onMessage = this.onMessage.bind(this);
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if (process.env.NODE_ENV !== 'test') {
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this.intervalId = setInterval(() => {
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this.fetch(true).then(meta => {
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// fetch内でもセットしてるけど仕様変更の可能性もあるため一応
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this.cache = meta;
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});
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}, 1000 * 60 * 5);
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}
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this.redisForSub.on('message', this.onMessage);
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}
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@bindThis
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private async onMessage(_: string, data: string): Promise<void> {
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const obj = JSON.parse(data);
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if (obj.channel === 'internal') {
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const { type, body } = obj.message as StreamMessages['internal']['payload'];
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switch (type) {
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case 'metaUpdated': {
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this.cache = body;
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break;
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}
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default:
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break;
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}
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}
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}
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@bindThis
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public async fetch(noCache = false): Promise<Meta> {
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if (!noCache && this.cache) return this.cache;
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return await this.db.transaction(async transactionalEntityManager => {
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// 過去のバグでレコードが複数出来てしまっている可能性があるので新しいIDを優先する
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const metas = await transactionalEntityManager.find(Meta, {
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order: {
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id: 'DESC',
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},
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});
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const meta = metas[0];
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if (meta) {
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this.cache = meta;
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return meta;
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} else {
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// metaが空のときfetchMetaが同時に呼ばれるとここが同時に呼ばれてしまうことがあるのでフェイルセーフなupsertを使う
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const saved = await transactionalEntityManager
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.upsert(
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Meta,
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{
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id: 'x',
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},
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['id'],
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)
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.then((x) => transactionalEntityManager.findOneByOrFail(Meta, x.identifiers[0]));
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this.cache = saved;
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return saved;
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}
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});
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}
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@bindThis
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public async update(data: Partial<Meta>): Promise<Meta> {
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const updated = await this.db.transaction(async transactionalEntityManager => {
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const metas = await transactionalEntityManager.find(Meta, {
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order: {
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id: 'DESC',
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},
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});
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const meta = metas[0];
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if (meta) {
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await transactionalEntityManager.update(Meta, meta.id, data);
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const metas = await transactionalEntityManager.find(Meta, {
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order: {
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id: 'DESC',
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},
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});
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return metas[0];
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} else {
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return await transactionalEntityManager.save(Meta, data);
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}
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});
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this.globalEventService.publishInternalEvent('metaUpdated', updated);
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return updated;
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}
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@bindThis
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public onApplicationShutdown(signal?: string | undefined) {
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clearInterval(this.intervalId);
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this.redisForSub.off('message', this.onMessage);
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}
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}
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