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import { Inject, Injectable } from '@nestjs/common';
import { Not } from 'typeorm';
import { MiNote } from '@/models/Note.js';
import { isPureRenote } from '@/misc/is-renote.js';
import { SkLatestNote } from '@/models/LatestNote.js';
import { DI } from '@/di-symbols.js';
import type { LatestNotesRepository, NotesRepository } from '@/models/_.js';
import { LoggerService } from '@/core/LoggerService.js';
import Logger from '@/logger.js';
import { QueryService } from './QueryService.js';
@Injectable()
export class LatestNoteService {
private readonly logger: Logger;
constructor(
@Inject(DI.notesRepository)
private readonly notesRepository: NotesRepository,
@Inject(DI.latestNotesRepository)
private readonly latestNotesRepository: LatestNotesRepository,
private readonly queryService: QueryService,
loggerService: LoggerService,
) {
this.logger = loggerService.getLogger('LatestNoteService');
}
handleUpdatedNoteBG(before: MiNote, after: MiNote): void {
this
.handleUpdatedNote(before, after)
.catch(err => this.logger.error('Unhandled exception while updating latest_note (after update):', err));
}
async handleUpdatedNote(before: MiNote, after: MiNote): Promise<void> {
// If the key didn't change, then there's nothing to update
if (SkLatestNote.areEquivalent(before, after)) return;
// Simulate update as delete + create
await this.handleDeletedNote(before);
await this.handleCreatedNote(after);
}
handleCreatedNoteBG(note: MiNote): void {
this
.handleCreatedNote(note)
.catch(err => this.logger.error('Unhandled exception while updating latest_note (after create):', err));
}
async handleCreatedNote(note: MiNote): Promise<void> {
// Ignore DMs.
// Followers-only posts are *included*, as this table is used to back the "following" feed.
if (note.visibility === 'specified') return;
// Ignore pure renotes
if (isPureRenote(note)) return;
// Compute the compound key of the entry to check
const key = SkLatestNote.keyFor(note);
// Make sure that this isn't an *older* post.
// We can get older posts through replies, lookups, updates, etc.
const currentLatest = await this.latestNotesRepository.findOneBy(key);
if (currentLatest != null && currentLatest.noteId >= note.id) return;
// Record this as the latest note for the given user
const latestNote = new SkLatestNote({
...key,
noteId: note.id,
});
await this.latestNotesRepository.upsert(latestNote, ['userId', 'isPublic', 'isReply', 'isQuote']);
}
handleDeletedNoteBG(note: MiNote): void {
this
.handleDeletedNote(note)
.catch(err => this.logger.error('Unhandled exception while updating latest_note (after delete):', err));
}
async handleDeletedNote(note: MiNote): Promise<void> {
// If it's a DM, then it can't possibly be the latest note so we can safely skip this.
if (note.visibility === 'specified') return;
// If it's a pure renote, then it can't possibly be the latest note so we can safely skip this.
if (isPureRenote(note)) return;
// Compute the compound key of the entry to check
const key = SkLatestNote.keyFor(note);
// Check if the deleted note was possibly the latest for the user
const existingLatest = await this.latestNotesRepository.findOneBy(key);
if (existingLatest == null || existingLatest.noteId !== note.id) return;
// Find the newest remaining note for the user.
// We exclude DMs and pure renotes.
const query = this.notesRepository
.createQueryBuilder('note')
.select()
.where({
userId: key.userId,
visibility: key.isPublic
? 'public'
: Not('specified'),
replyId: key.isReply
? Not(null)
: null,
renoteId: key.isQuote
? Not(null)
: null,
})
.orderBy({ id: 'DESC' });
this.queryService.andIsNotRenote(query, 'note');
const nextLatest = await query.getOne();
if (!nextLatest) return;
// Record it as the latest
const latestNote = new SkLatestNote({
...key,
noteId: nextLatest.id,
});
// When inserting the latest note, it's possible that another worker has "raced" the insert and already added a newer note.
// We must use orIgnore() to ensure that the query ignores conflicts, otherwise an exception may be thrown.
await this.latestNotesRepository
.createQueryBuilder('latest')
.insert()
.into(SkLatestNote)
.values(latestNote)
.orIgnore()
.execute();
}
}
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