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Injectable,
Logger,
} from '@nestjs/common';
import { InjectRepository } from '@nestjs/typeorm';
import { Repository, LessThanOrEqual, In } from 'typeorm';
import {
NotificationQueue,
NotificationLog,
Notification,
QueueStatus,
NotificationChannel,
} from '../entities';
export interface QueueItem {
id: string;
notification_id: string;
channel: NotificationChannel;
priority_value: number;
attempts: number;
notification: Notification;
}
export interface QueueStats {
queued: number;
processing: number;
sent: number;
failed: number;
retrying: number;
}
@Injectable()
export class NotificationQueueService {
private readonly logger = new Logger(NotificationQueueService.name);
constructor(
@InjectRepository(NotificationQueue)
private readonly queueRepository: Repository<NotificationQueue>,
@InjectRepository(NotificationLog)
private readonly logRepository: Repository<NotificationLog>,
@InjectRepository(Notification)
private readonly notificationRepository: Repository<Notification>,
) {}
async enqueue(
notificationId: string,
channel: NotificationChannel,
priority: 'low' | 'normal' | 'high' | 'urgent' = 'normal',
scheduledFor?: Date,
): Promise<NotificationQueue> {
const priorityValue = this.getPriorityValue(priority);
const queueItem = this.queueRepository.create({
notification_id: notificationId,
channel,
priority_value: priorityValue,
scheduled_for: scheduledFor || new Date(),
status: 'queued',
attempts: 0,
max_attempts: 3,
});
const saved = await this.queueRepository.save(queueItem);
this.logger.debug(
`Enqueued notification ${notificationId} for channel ${channel}`,
);
return saved;
}
async enqueueBatch(
notificationId: string,
channels: NotificationChannel[],
priority: 'low' | 'normal' | 'high' | 'urgent' = 'normal',
): Promise<NotificationQueue[]> {
const priorityValue = this.getPriorityValue(priority);
const now = new Date();
const items = channels.map((channel) =>
this.queueRepository.create({
notification_id: notificationId,
channel,
priority_value: priorityValue,
scheduled_for: now,
status: 'queued',
attempts: 0,
max_attempts: 3,
}),
);
const saved = await this.queueRepository.save(items);
this.logger.debug(
`Enqueued notification ${notificationId} for ${channels.length} channels`,
);
return saved;
}
async getPendingItems(
limit: number = 100,
channel?: NotificationChannel,
): Promise<QueueItem[]> {
const now = new Date();
const queryBuilder = this.queueRepository
.createQueryBuilder('q')
.leftJoinAndSelect('q.notification', 'n')
.where('q.status IN (:...statuses)', {
statuses: ['queued', 'retrying'],
})
.andWhere('(q.scheduled_for IS NULL OR q.scheduled_for <= :now)', { now })
.andWhere('(q.next_retry_at IS NULL OR q.next_retry_at <= :now)', { now })
.orderBy('q.priority_value', 'DESC')
.addOrderBy('q.created_at', 'ASC')
.take(limit);
if (channel) {
queryBuilder.andWhere('q.channel = :channel', { channel });
}
return queryBuilder.getMany() as Promise<QueueItem[]>;
}
async markAsProcessing(queueId: string): Promise<void> {
await this.queueRepository.update(queueId, {
status: 'processing',
last_attempt_at: new Date(),
});
}
async markAsSent(
queueId: string,
provider?: string,
providerMessageId?: string,
providerResponse?: Record<string, any>,
): Promise<void> {
const queueItem = await this.queueRepository.findOne({
where: { id: queueId },
});
if (!queueItem) {
return;
}
// Update queue item
await this.queueRepository.update(queueId, {
status: 'sent',
completed_at: new Date(),
attempts: queueItem.attempts + 1,
});
// Update notification status
await this.notificationRepository.update(queueItem.notification_id, {
delivery_status: 'sent',
sent_at: new Date(),
});
// Create log
await this.logRepository.save({
notification_id: queueItem.notification_id,
queue_id: queueId,
channel: queueItem.channel,
status: 'sent',
provider,
provider_message_id: providerMessageId,
provider_response: providerResponse,
delivered_at: new Date(),
});
this.logger.debug(`Queue item ${queueId} marked as sent`);
}
async markAsFailed(
queueId: string,
errorMessage: string,
provider?: string,
): Promise<void> {
const queueItem = await this.queueRepository.findOne({
where: { id: queueId },
});
if (!queueItem) {
return;
}
const newAttempts = queueItem.attempts + 1;
const shouldRetry = newAttempts < queueItem.max_attempts;
if (shouldRetry) {
// Schedule retry with exponential backoff
const retryDelay = Math.pow(2, queueItem.attempts) * 60 * 1000; // 1, 2, 4 minutes
const nextRetryAt = new Date(Date.now() + retryDelay);
await this.queueRepository.update(queueId, {
status: 'retrying',
attempts: newAttempts,
error_message: errorMessage,
error_count: queueItem.error_count + 1,
next_retry_at: nextRetryAt,
});
this.logger.debug(
`Queue item ${queueId} scheduled for retry at ${nextRetryAt.toISOString()}`,
);
} else {
// Final failure
await this.queueRepository.update(queueId, {
status: 'failed',
attempts: newAttempts,
error_message: errorMessage,
error_count: queueItem.error_count + 1,
completed_at: new Date(),
});
// Update notification status
await this.notificationRepository.update(queueItem.notification_id, {
delivery_status: 'failed',
});
this.logger.warn(
`Queue item ${queueId} failed permanently after ${newAttempts} attempts`,
);
}
// Create log
await this.logRepository.save({
notification_id: queueItem.notification_id,
queue_id: queueId,
channel: queueItem.channel,
status: 'failed',
provider,
error_message: errorMessage,
});
}
async getStats(): Promise<QueueStats> {
const stats = await this.queueRepository
.createQueryBuilder('q')
.select('q.status', 'status')
.addSelect('COUNT(*)', 'count')
.groupBy('q.status')
.getRawMany();
const result: QueueStats = {
queued: 0,
processing: 0,
sent: 0,
failed: 0,
retrying: 0,
};
for (const row of stats) {
result[row.status as keyof QueueStats] = parseInt(row.count, 10);
}
return result;
}
async getStatsByChannel(): Promise<
Array<{ channel: string; status: string; count: number }>
> {
return this.queueRepository
.createQueryBuilder('q')
.select('q.channel', 'channel')
.addSelect('q.status', 'status')
.addSelect('COUNT(*)', 'count')
.groupBy('q.channel')
.addGroupBy('q.status')
.getRawMany();
}
async cleanupOldItems(daysToKeep: number = 30): Promise<number> {
const cutoffDate = new Date();
cutoffDate.setDate(cutoffDate.getDate() - daysToKeep);
const result = await this.queueRepository
.createQueryBuilder()
.delete()
.where('status IN (:...statuses)', { statuses: ['sent', 'failed'] })
.andWhere('completed_at < :cutoff', { cutoff: cutoffDate })
.execute();
if (result.affected && result.affected > 0) {
this.logger.log(`Cleaned up ${result.affected} old queue items`);
}
return result.affected || 0;
}
async cancelPending(notificationId: string): Promise<number> {
const result = await this.queueRepository.update(
{
notification_id: notificationId,
status: In(['queued', 'retrying']),
},
{
status: 'failed',
error_message: 'Cancelled',
completed_at: new Date(),
},
);
return result.affected || 0;
}
private getPriorityValue(
priority: 'low' | 'normal' | 'high' | 'urgent',
): number {
switch (priority) {
case 'urgent':
return 10;
case 'high':
return 5;
case 'normal':
return 0;
case 'low':
return -5;
default:
return 0;
}
}
}
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