From 8948aadc45635d1dc50bb9d26db651dc83c41ba5 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Estev=C3=A3o?= <estevao@chedieck.com>
Date: Wed, 4 Dec 2024 17:30:08 -0300
Subject: [PATCH] feat: wrap mailer on global

---
 constants/mail.ts          | 42 ++++++++++++++++++++++++--------------
 services/triggerService.ts |  4 ++--
 2 files changed, 29 insertions(+), 17 deletions(-)

diff --git a/constants/mail.ts b/constants/mail.ts
index 990514bb8..2af7b4e63 100644
--- a/constants/mail.ts
+++ b/constants/mail.ts
@@ -2,26 +2,38 @@ import { Prisma } from '@prisma/client'
 import config from 'config/index'
 import { XEC_TX_EXPLORER_URL, BCH_TX_EXPLORER_URL } from 'constants/index'
 import nodemailer from 'nodemailer'
+import SMTPTransport from 'nodemailer/lib/smtp-transport'
 import { getAddressPrefix } from 'utils'
 import { OpReturnData } from 'utils/validators'
 
-export const MAIL_TRANSPORTER = nodemailer.createTransport({
-  host: config.smtpHost,
-  secure: config.smtpPort === 465,
-  logger: true,
-  auth: {
-    user: process.env.SMTP_USER,
-    pass: process.env.SMTP_PASSWORD
-  }
-})
+export interface MailerGlobal extends NodeJS.Global {
+  mailerTransporter?: nodemailer.Transporter<SMTPTransport.SentMessageInfo, SMTPTransport.Options>
+}
 
-MAIL_TRANSPORTER.verify((error, _success) => {
-  if (error != null) {
-    console.error('ERROR SETTING UP MAILER:', error)
-  } else {
-    console.log('Mailer ready to send messages')
+declare const global: MailerGlobal
+
+export const getMailerTransporter = (): nodemailer.Transporter<SMTPTransport.SentMessageInfo, SMTPTransport.Options> => {
+  if (global.mailerTransporter === undefined) {
+    global.mailerTransporter = nodemailer.createTransport({
+      host: config.smtpHost,
+      secure: config.smtpPort === 465,
+      logger: true,
+      auth: {
+        user: process.env.SMTP_USER,
+        pass: process.env.SMTP_PASSWORD
+      }
+    })
+    global.mailerTransporter.verify((error, _success) => {
+      if (error != null) {
+        console.error('ERROR SETTING UP MAILER:', error)
+        global.mailerTransporter = undefined
+      } else {
+        console.log('Mailer ready to send messages')
+      }
+    })
   }
-})
+  return global.mailerTransporter
+}
 
 export const MAIL_FROM = 'no-reply@paybutton.org'
 export const MAIL_SUBJECT = 'New Payment Received'
diff --git a/services/triggerService.ts b/services/triggerService.ts
index 54796780b..349e93ec7 100644
--- a/services/triggerService.ts
+++ b/services/triggerService.ts
@@ -6,7 +6,7 @@ import { EMPTY_OP_RETURN, OpReturnData, parseTriggerPostData } from 'utils/valid
 import { BroadcastTxData } from 'ws-service/types'
 import { fetchPaybuttonById, fetchPaybuttonWithTriggers } from './paybuttonService'
 import config from 'config'
-import { MAIL_FROM, MAIL_HTML_REPLACER, MAIL_SUBJECT, MAIL_TRANSPORTER, SendEmailParameters } from 'constants/mail'
+import { MAIL_FROM, MAIL_HTML_REPLACER, MAIL_SUBJECT, getMailerTransporter, SendEmailParameters } from 'constants/mail'
 
 const triggerWithPaybutton = Prisma.validator<Prisma.PaybuttonTriggerArgs>()({
   include: { paybutton: true }
@@ -339,7 +339,7 @@ async function sendEmailForTrigger (trigger: TriggerWithPaybutton, sendEmailPara
   try {
     const user = await fetchUserFromTriggerId(trigger.id)
     if (user.emailCredits > 0) {
-      const response = await MAIL_TRANSPORTER.sendMail(mailOptions)
+      const response = await getMailerTransporter().sendMail(mailOptions)
       logData = {
         email: trigger.emails,
         responseData: response.response