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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 92 93 94 95 96 97 98 | 3x 3x 3x 3x 3x 3x 3x 3x 3x 26x 26x 7x 7x 3x 3x 3x 3x 2x 1x 1x 1x 1x 3x 3x 3x 3x 3x 3x 3x 3x 2x 1x 1x 3x 3x 3x | import {
Inject,
Injectable,
InternalServerErrorException,
Logger,
ServiceUnavailableException,
forwardRef,
} from '@nestjs/common'
import { Cron } from '@nestjs/schedule'
import { ObjectId } from 'mongoose'
import { MailData, MailEvent } from '../../db/entities/mail-event.entity'
import { MailEventDBService } from '../../db/services/mail-event.service'
import { MailSendService } from './send.service'
/**
* @description Service reliable for scheduling the sending of emails
*/
@Injectable()
export class MailScheduleService {
private readonly logger = new Logger(MailScheduleService.name)
constructor(
@Inject(forwardRef(() => MailSendService))
private readonly mailSendService: MailSendService,
private readonly mailEventService: MailEventDBService,
) {}
async scheduleMailNow(mail: MailData): Promise<void> {
try {
await this.mailSendService.sendMail(mail)
} catch (error) {
this.logger.error(
`Encountered error while trying to send email: ${error}`,
)
throw new ServiceUnavailableException(
'We are experiencing issues within our backend, please try again later',
)
}
}
async scheduleMailAtDate(scheduleDate: Date, mail: MailData): Promise<void> {
const mailEvent: Partial<MailEvent> = {
scheduledAt: scheduleDate,
hasBeenSent: false,
hasBeenRescheduled: false,
content: mail,
}
const insertedValue = await this.mailEventService.createEvent(mailEvent)
Iif (!insertedValue) {
this.logger.warn(`MailEvent could not be inserted into the database`)
throw new InternalServerErrorException('Mailevent could not be scheduled')
}
}
private async rescheduleMails(
ids: ObjectId[],
newSendDate?: Date,
): Promise<void> {
if (ids.length == 0) {
return
}
if (!newSendDate) {
newSendDate = new Date()
// Reschedule 5 hours later by default
newSendDate.setHours(newSendDate.getHours() + 5)
}
await this.mailEventService.rescheduleMails(ids, newSendDate)
}
// Run every hour
@Cron('0 * * * *')
async sendScheduledMails(): Promise<void> {
const mails = await this.mailEventService.getOpenEventsBefore(new Date())
Iif (!mails) {
this.logger.log(`No scheduled mails for cron`)
return
}
// TODO: This lacks error handling
const successIds: ObjectId[] = []
const failureIds: ObjectId[] = []
for (const mail of mails) {
try {
await this.mailSendService.sendMail(mail.content)
successIds.push(mail._id)
} catch (error) {
this.logger.warn(
`Could not send scheduled mail due to an error ${error}`,
)
failureIds.push(mail._id)
}
}
this.logger.log(
`Send ${successIds.length} scheduled mails, failed to send ${failureIds.length}`,
)
await this.mailEventService.markMailsAsSend(successIds)
await this.rescheduleMails(failureIds)
}
}
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