node.js - Nodejs Nodemailer 创建事件

Question

我使用nodejs nodemail发送邮件，所以我想在发送邮件时创建事件错误和成功，而不是使用回调

var util = require('util');
var event = require('events');
var nodemailer = require("nodemailer");
var smtpTransport = nodemailer.createTansport("SMTP", {
     service: "GMAIL",
     auth: {
        user : "mail@mail.com",
        pass : "pass"
           }
     });
mail.exports = function(from, to, subject ...){
    this.from = from;
    this.to = to;
    this.subject = subject;
    ....

    this.send = function(){
        var options = {
            from = this.from;
            to = this.to;

        };
        var obj = this.send;
        event.Eventemitter.call(obj);
        smtpTransport.sendMail(options, function(err, success) {
            if(err){
                obj.emit('error', err);
            }
            if(success){
                obj.emit('success', success);
            }
        });
    }
};

然后调用邮件服务

var Mail = require('./mail');
var mail = new Mail();
    mail.from = "email@mail.com";
    mail.to = "email@mail.com";
    ...
    mail.send(); //the mail is send

邮件已发送，但不知道是否发送

    mail.send()
     .on("error", function(err){
         console.log("Mail not send");
     })
     .on("success", function(success){
         console.log("Mail send");
     });

我遵循了以下教程 http://www.sitepoint.com/nodejs-events-and-eventemitter/

Answer 1

这样的事情应该有效:

var util = require('util');
var events = require('events');
var nodemailer = require("nodemailer");
var smtpTransport = nodemailer.createTansport("SMTP", {
     service: "GMAIL",
     auth: {
        user : "mail@mail.com",
        pass : "pass"
           }
     });

module.exports = function(from, to, subject){
    this.from = from;
    this.to = to;
    this.subject = subject;
    this.events = new events.EventEmitter();
    //....
    this.send = function(){
        var options = {
            from : this.from,
            to : this.to

        };

        smtpTransport.sendMail(options, function(err, success) {
            if(err){
                this.events.emit('error', err);
            }
            if(success){
                this.events.emit('success', success);
            }
        });
    }
};

然后像这样使用它:

var Mail = require('./mail');
var mail = new Mail();
mail.from = "email@mail.com";
mail.to = "email@mail.com";

mail.events.on("error", function(err){
         console.log("Mail not send");
});
mail.events.on("success", function(success){
         console.log("Mail send");
});

mail.send();

我目前无法访问 gmail 来测试发送等，但这原则上应该有效。

我修复了您的初始示例中的各种语法问题。

要记住的主要事情是，您需要将 EventEmitter 公开给客户端代码，以便它们可以注册回调，并确保在发送电子邮件之前注册回调。

您也可以在不使用 EventEmitter 的情况下通过传入成功和失败回调函数来完成此操作。这将使事情变得更简单。

module.exports = function(params){
    this.from = params.from;
    this.to = params.to;
    this.subject = params.subject;
    this.successCallback = params.successCallback;
    this.errorCallback= params.errorCallback;

    this.send = function(){
        var options = {
            from : this.from,
            to : this.to    
        };

        smtpTransport.sendMail(options, function(err, success) {
            if(err){
                this.errorCallback(err);
            }
            else{
                this.successCallback(success);
            }
        });
    }
};

调用方式如下:

var Mail = require('./mail');
var mail = new Mail({
  from : "email@mail.com", 
  to : "email@mail.com", 
  subject : "subject", 
  successCallback : function(success){
            console.log("Mail send");
         },
  errorCallback : function(err){
           console.log("Mail not send");
        }
});

mail.send();