Bulletproof email queue on top of NodeMailer with support of multiple clusters and servers setup. 

📮 Email queue extending NodeMailer with multi SMTP transports and horizontally scaled apps support

dr.dimitru

mail-time

Bulletproof email queue on top of NodeMailer with support of multiple clusters and servers setup

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const _debug = console.info.bind(console);

const _log   = console.error.bind(console);

    _log('[mail-time] [mongoErrorHandler]:', error);

  if (!(typeof a === 'object' && typeof b === 'object')) {

  if (a instanceof Date && b instanceof Date) {

    for (i = _a.length - 1; i >= 0; i--) {

      for (j = _b.length - 1; j >= 0; j--) {

  if (typeof a === 'object' && typeof b === 'object') {

    for (i = akeys.length - 1; i >= 0; i--) {

      if (!hasOwnProperty.call(b, akeys[i])) {

      if (!equals(a[akeys[i]], b[akeys[i]])) {

    if (!opts || typeof opts !== 'object' || opts === null) {

      throw new TypeError('[mail-time] Configuration object must be passed into MailTime constructor');

      throw new Error('[mail-time] MongoDB database {db} option is required, like returned from `MongoClient.connect`');

    this.type        = (!opts.type || (opts.type !== 'client' && opts.type !== 'server')) ? 'server' : opts.type;

        this.___handleError(task, findUpdateError);

        this.___handleError(task, findUpdateError, {});

        if (this.strategy === 'balancer') {

          this.transport = this.transport + 1;

          if (this.transport >= this.transports.length) {

          transportIndex = this.transport;

          transport = this.transports[this.transport];

          transportIndex = task.transport;

          transport = this.transports[task.transport];

          const _mailOpts = this.___compileMailOpts(transport, task);

            _debug('[mail-time] Send attempt #' + (task.tries) + ', transport #' + transportIndex + ', to: ', task.mailOptions[0].to, 'from: ', _mailOpts.from);

          transport.sendMail(_mailOpts, (error, info) => {

              this.___handleError(task, error);

              this.___handleError(task, error, info);

              this.___handleError(task, 'Message not accepted or Greeting never received', info);

                _debug('[mail-time] email successfully sent, attempts: #' + (task.tries) + ', transport #' + transportIndex + ' to: ', _mailOpts.to);

              const _id = task._id.toHexString();

              if (this.callbacks[_id] && this.callbacks[_id].length) {

                this.callbacks[_id].forEach((cb, index) => {

                  cb(void 0, info, task.mailOptions[index]);

                this.callbacks[_id].forEach((cb, i) => {

                  cb(void 0, info, task.mailOptions[i]);

              delete this.callbacks[_id];

            _log('[mail-time] Exception during runtime:', e);

          this.___handleError(task, e, {});

   @param opts          {Object}   - Letter options with next properties:

   @param opts.sendAt   {Date}     - When email should be sent

   @param opts.template {String}   - Template string

   @param opts[key]     {mix}      - Other MailOptions according to NodeMailer lib

   @param opts[key]     {mix}      - Other MailOptions according to NodeMailer lib documentation

   @param callback      {Function} - [OPTIONAL] Callback function

      throw new Error('`html` nor `text` field is presented, at least one of those fields is required');

    if (!opts.sendAt || Object.prototype.toString.call(opts.sendAt) !== '[object Date]') {

    if (typeof opts.template !== 'string') {

    if (typeof opts.concatSubject !== 'string') {

    const _template      = opts.template;

    const _concatSubject = opts.concatSubject;

    if (typeof opts.to !== 'string' && (!(opts.to instanceof Array) || !opts.to.length)) {

      throw new Error('[mail-time] `mailOptions.to` is required and must be a string or non-empty Array');

            _log('[mail-time] something went wrong, can\'t send email to: ', opts.mailOptions[0].to, findError);

          callback(findError, void 0, task);

          const queue = task.mailOptions || [];

          for (let i = 0; i < queue.length; i++) {

            if (equals(queue[i], opts)) {

                _log('[mail-time] something went wrong, can\'t send email to: ', task.mailOptions[0].to, updateError);

              callback(updateError, void 0, task);

        _sendAt = new Date(+_sendAt + this.concatThrottling);

   @param error {mix}    - Error String/Object/Error

   @param info  {Object} - Info object returned from nodemailer

          _log('[mail-time] Giving up trying send email after ' + (task.tries) + ' attempts to: ', task.mailOptions[0].to, error);

        const _id = task._id.toHexString();

        if (this.callbacks[_id] && this.callbacks[_id].length) {

          this.callbacks[_id].forEach((cb, i) => {

            cb(error, void 0, task.mailOptions[i]);

            cb(error, info, task.mailOptions[i]);

      let transportIndex = task.transport;

      if (this.strategy === 'backup' && (task.tries % this.failsToNext) === 0) {

        if (transportIndex > this.transports.length - 1) {

        _debug('[mail-time] Re-send Attempt #' + (task.tries) + ', transport #' + transportIndex + ' to: ', task.mailOptions[0].to, error);

   @param opts             {Object}   - Letter options with next properties:

   @param opts.sendAt      {Date}     - When email should be sent

   @param opts.mailOptions {Object}   - MailOptions according to NodeMailer lib

   @param callback         {Function} - [OPTIONAL] Callback function

    this.collection.insertOne(task, (insertError, r) => {

          _log('[mail-time] something went wrong, can\'t send email to: ', opts.mailOptions[0].to, insertError);

        callback(insertError, void 0, opts);

      const _id = r.insertedId.toHexString();

      this.callbacks[_id].push(callback);

   @param string       {String} - Template with Spacebars/Blaze/Mustache-like placeholders

   @param replacements {Object} - Blaze/Mustache-like helpers Object

    const matchHTML = string.match(/\{{3}\s?([a-zA-Z0-9\-\_]+)\s?\}{3}/g);

      for (i = 0; i < matchHTML.length; i++) {

        if (replacements[matchHTML[i].replace('{{{', '').replace('}}}', '').trim()]) {

          string = string.replace(matchHTML[i], replacements[matchHTML[i].replace('{{{', '').replace('}}}', '').trim()]);

    const matchStr  = string.match(/\{{2}\s?([a-zA-Z0-9\-\_]+)\s?\}{2}/g);

      for (i = 0; i < matchStr.length; i++) {

        if (replacements[matchStr[i].replace('{{', '').replace('}}', '').trim()]) {

		{
		"name": "mail-time",
		"version": "1.0.5",
		"version": "1.0.6",
		"description": "Bulletproof email queue on top of NodeMailer with support of multiple clusters and servers setup",
		@@ -57,5 +57,5 @@ "main": "index.js",
		"mocha": "^6.0.2",
		"mongodb": "^3.2.4",
		"mongodb": "^3.1.13",
		"nodemailer": "^6.1.1"
		}
		}

		@@ -310,3 +310,3 @@ const JoSk = require('josk');
		if (findUpdateError) {
		this.___handleError(task, findUpdateError);
		this.___handleError(task, findUpdateError, {});
		return;
		@@ -343,6 +343,11 @@ }
		if (error) {
		this.___handleError(task, error);
		this.___handleError(task, error, info);
		return;
		}

		if (!info.accepted.length) {
		this.___handleError(task, 'Message not accepted or Greeting never received', info);
		return;
		}

		this.collection.deleteOne({
		@@ -357,4 +362,4 @@ _id: task._id
		if (this.callbacks[_id] && this.callbacks[_id].length) {
		this.callbacks[_id].forEach((cb, index) => {
		cb(void 0, info, task.mailOptions[index]);
		this.callbacks[_id].forEach((cb, i) => {
		cb(void 0, info, task.mailOptions[i]);
		});
		@@ -371,3 +376,3 @@ }
		}
		this.___handleError(task, e);
		this.___handleError(task, e, {});
		}
		@@ -396,3 +401,3 @@ });
		@param opts.template {String} - Template string
		@param opts[key] {mix} - Other MailOptions according to NodeMailer lib
		@param opts[key] {mix} - Other MailOptions according to NodeMailer lib documentation
		@param callback {Function} - [OPTIONAL] Callback function
		@@ -504,5 +509,6 @@ @returns {void}
		@param error {mix} - Error String/Object/Error
		@param info {Object} - Info object returned from nodemailer
		@returns {void}
		*/
		___handleError(task, error) {
		___handleError(task, error, info) {
		if (!task) {
		@@ -523,3 +529,3 @@ return;
		this.callbacks[_id].forEach((cb, i) => {
		cb(error, void 0, task.mailOptions[i]);
		cb(error, info, task.mailOptions[i]);
		});
		@@ -526,0 +532,0 @@ }

Improved metrics