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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 | 2x 2x 2x 2x 2x 2x 2x 2x 7x 7x 7x 7x 2x 4x 4x 2x 4x 4x 4x 3x 3x 3x 4x 3x 3x 3x 8x 2x 2x | import { RabbitSubscribe } from '@golevelup/nestjs-rabbitmq';
import { Injectable, Logger } from '@nestjs/common';
import type { ConsumeMessage } from 'amqplib';
import { EXCHANGES, WORK_ORDER_EVENTS } from '@app/contracts';
import type { WorkOrderEvent } from '@app/contracts';
import { EventRetryHandler } from './event-retry.handler';
import { NotificationSender } from './notification-sender';
import { ProcessedEventsStore } from './processed-events.store';
export const QUEUES = {
WORK_ORDER_CREATED: 'notifications.work-order-created',
WORK_ORDER_COMPLETED: 'notifications.work-order-completed',
} as const;
@Injectable()
export class WorkOrderEventsConsumer {
private readonly logger = new Logger(WorkOrderEventsConsumer.name);
constructor(
private readonly sender: NotificationSender,
private readonly retry: EventRetryHandler,
private readonly processed: ProcessedEventsStore,
) {}
@RabbitSubscribe({
exchange: EXCHANGES.EVENTS,
routingKey: WORK_ORDER_EVENTS.CREATED,
queue: QUEUES.WORK_ORDER_CREATED,
queueOptions: { durable: true },
})
async onWorkOrderCreated(
event: WorkOrderEvent,
message: ConsumeMessage,
): Promise<void> {
await this.retry.handle(QUEUES.WORK_ORDER_CREATED, event, message, () =>
this.notifyCreated(event),
);
}
@RabbitSubscribe({
exchange: EXCHANGES.EVENTS,
routingKey: WORK_ORDER_EVENTS.COMPLETED,
queue: QUEUES.WORK_ORDER_COMPLETED,
queueOptions: { durable: true },
})
async onWorkOrderCompleted(
event: WorkOrderEvent,
message: ConsumeMessage,
): Promise<void> {
await this.retry.handle(QUEUES.WORK_ORDER_COMPLETED, event, message, () =>
this.notifyCompleted(event),
);
}
private async notifyCreated(event: WorkOrderEvent): Promise<void> {
if (this.isDuplicate(event)) return;
this.logger.log(
`received ${event.type} (${event.eventId}) correlationId=${event.correlationId ?? 'none'}`,
);
await this.sender.send({
// Recipient resolution (property manager lookup) arrives with the
// Properties service; a deterministic placeholder keeps the flow honest.
recipient: `manager-of-${event.data.propertyId}`,
subject: `New work order: ${event.data.title}`,
body: `A ${event.data.priority} priority work order was opened for property ${event.data.propertyId}.`,
});
this.processed.mark(event.eventId);
}
private async notifyCompleted(event: WorkOrderEvent): Promise<void> {
if (this.isDuplicate(event)) return;
this.logger.log(
`received ${event.type} (${event.eventId}) correlationId=${event.correlationId ?? 'none'}`,
);
await this.sender.send({
recipient: `tenant-of-${event.data.propertyId}`,
subject: `Work order completed: ${event.data.title}`,
body: `The work order for property ${event.data.propertyId} has been completed.`,
});
this.processed.mark(event.eventId);
}
/** At-least-once delivery makes duplicates a matter of when, not if; the
* store marks only after a successful send, so retries still go through. */
private isDuplicate(event: WorkOrderEvent): boolean {
if (!this.processed.has(event.eventId)) return false;
this.logger.debug(`duplicate ${event.type} (${event.eventId}) skipped`);
return true;
}
}
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