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Sharkey
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try to avoid `insert` races in `FederatedInstanceService` 

Despite the cache, different processes can race to insert a row for
the same remote host.

This is particularly apparent in our unit tests, with
`test/unit/activitypub.ts` randomly failing.

This is a (somewhat clumsy) attempt at working around that race: trap
the "duplicate key value" error, and fetch the record.

Tests pass, with or without values in the cache.
This commit is contained in:
dakkar 2024-10-12 10:43:28 +01:00
parent f3e6b43ea4
commit 06bd29f209
1 changed files with 20 additions and 5 deletions
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17
packages/backend/src/core/FederatedInstanceService.ts
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@ -12,6 +12,8 @@ import { IdService } from '@/core/IdService.js';
import { DI } from '@/di-symbols.js';
import { UtilityService } from '@/core/UtilityService.js';
import { bindThis } from '@/decorators.js';
import { QueryFailedError } from 'typeorm';
import { isDuplicateKeyValueError } from '@/misc/is-duplicate-key-value-error.js';
@Injectable()
export class FederatedInstanceService implements OnApplicationShutdown {
@ -56,11 +58,24 @@ export class FederatedInstanceService implements OnApplicationShutdown {
const index = await this.instancesRepository.findOneBy({ host });
if (index == null) {
const i = await this.instancesRepository.insertOne({
let i;
try {
i = await this.instancesRepository.insertOne({
id: this.idService.gen(),
host,
firstRetrievedAt: new Date(),
});
} catch (e: unknown) {
if (e instanceof QueryFailedError) {
if (isDuplicateKeyValueError(e)) {
i = await this.instancesRepository.findOneBy({ host });
}
}
if (i == null) {
throw e;
}
}
this.federatedInstanceCache.set(host, i);
return i;