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refactor(core): Introduce @OnLeaderTakeover and @OnLeaderStepdown (#14940)

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This commit is contained in:
Iván Ovejero
2025-04-28 10:53:01 +02:00
committed by GitHub
parent 9f2182568a
commit 2d60e469f3
10 changed files with 326 additions and 51 deletions
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20
packages/cli/src/scaling/multi-main-setup.ee.ts
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@@ -1,5 +1,6 @@
import { GlobalConfig } from '@n8n/config';
import { Service } from '@n8n/di';
import { MultiMainMetadata } from '@n8n/decorators';
import { Container, Service } from '@n8n/di';
import { InstanceSettings, Logger } from 'n8n-core';
import config from '@/config';
@@ -12,14 +13,14 @@ type MultiMainEvents = {
/**
* Emitted when this instance loses leadership. In response, its various
* services will stop triggers, pollers, pruning, wait-tracking, license
* renewal, queue recovery, etc.
* renewal, queue recovery, insights, etc.
*/
'leader-stepdown': never;
/**
* Emitted when this instance gains leadership. In response, its various
* services will start triggers, pollers, pruning, wait-tracking, license
* renewal, queue recovery, etc.
* renewal, queue recovery, insights, etc.
*/
'leader-takeover': never;
};
@@ -33,6 +34,7 @@ export class MultiMainSetup extends TypedEmitter<MultiMainEvents> {
private readonly publisher: Publisher,
private readonly redisClientService: RedisClientService,
private readonly globalConfig: GlobalConfig,
private readonly metadata: MultiMainMetadata,
) {
super();
this.logger = this.logger.scoped(['scaling', 'multi-main-setup']);
@@ -128,4 +130,16 @@ export class MultiMainSetup extends TypedEmitter<MultiMainEvents> {
async fetchLeaderKey() {
return await this.publisher.get(this.leaderKey);
}
registerEventHandlers() {
const handlers = this.metadata.getHandlers();
for (const { eventHandlerClass, methodName, eventName } of handlers) {
const instance = Container.get(eventHandlerClass);
this.on(eventName, async () => {
// eslint-disable-next-line @typescript-eslint/no-unsafe-return
return instance[methodName].call(instance);
});
}
}
}