pool-resource.js
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'use strict';
var SMTPConnection = require('smtp-connection');
var assign = require('./assign');
var EventEmitter = require('events').EventEmitter;
var util = require('util');
module.exports = PoolResource;
/**
* Creates an element for the pool
*
* @constructor
* @param {Object} options SMTPPool instance
*/
function PoolResource(pool) {
EventEmitter.call(this);
this.pool = pool;
this.options = pool.options;
this.logger = this.options.logger;
this._connection = false;
this._connected = false;
this.messages = 0;
this.available = true;
}
util.inherits(PoolResource, EventEmitter);
/**
* Initiates a connection to the SMTP server
*
* @param {Function} callback Callback function to run once the connection is established or failed
*/
PoolResource.prototype.connect = function (callback) {
this.pool.getSocket(this.options, function (err, socketOptions) {
if (err) {
return callback(err);
}
var returned = false;
var options = this.options;
if (socketOptions && socketOptions.connection) {
this.logger.info('Using proxied socket from %s:%s to %s:%s', socketOptions.connection.remoteAddress, socketOptions.connection.remotePort, options.host || '', options.port || '');
options = assign(false, options);
Object.keys(socketOptions).forEach(function (key) {
options[key] = socketOptions[key];
});
}
this.connection = new SMTPConnection(options);
this.connection.once('error', function (err) {
this.emit('error', err);
if (returned) {
return;
}
returned = true;
return callback(err);
}.bind(this));
this.connection.once('end', function () {
this.close();
if (returned) {
return;
}
returned = true;
return callback();
}.bind(this));
this.connection.connect(function () {
if (returned) {
return;
}
if (this.options.auth) {
this.connection.login(this.options.auth, function (err) {
if (returned) {
return;
}
returned = true;
if (err) {
this.connection.close();
this.emit('error', err);
return callback(err);
}
this._connected = true;
callback(null, true);
}.bind(this));
} else {
returned = true;
this._connected = true;
return callback(null, true);
}
}.bind(this));
}.bind(this));
};
/**
* Sends an e-mail to be sent using the selected settings
*
* @param {Object} mail Mail object
* @param {Function} callback Callback function
*/
PoolResource.prototype.send = function (mail, callback) {
if (!this._connected) {
this.connect(function (err) {
if (err) {
return callback(err);
}
this.send(mail, callback);
}.bind(this));
return;
}
var envelope = mail.message.getEnvelope();
var messageId = (mail.message.getHeader('message-id') || '').replace(/[<>\s]/g, '');
var recipients = [].concat(envelope.to || []);
if (recipients.length > 3) {
recipients.push('...and ' + recipients.splice(2).length + ' more');
}
this.logger.info('Sending message <%s> using #%s to <%s>', messageId, this.id, recipients.join(', '));
this.connection.send(envelope, mail.message.createReadStream(), function (err, info) {
this.messages++;
if (err) {
this.connection.close();
this.emit('error', err);
return callback(err);
}
info.envelope = {
from: envelope.from,
to: envelope.to
};
info.messageId = messageId;
setImmediate(function () {
var err;
if (this.messages >= this.options.maxMessages) {
err = new Error('Resource exhausted');
err.code = 'EMAXLIMIT';
this.connection.close();
this.emit('error', err);
} else {
this.pool._checkRateLimit(function () {
this.available = true;
this.emit('available');
}.bind(this));
}
}.bind(this));
callback(null, info);
}.bind(this));
};
/**
* Closes the connection
*/
PoolResource.prototype.close = function () {
this._connected = false;
if (this.connection) {
this.connection.close();
}
this.emit('close');
};