Send a message to n subscribed users when a date / time approaches nodejs

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Send a message to n subscribed users when a date / time approaches nodejs

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#1 by (2 votes)

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I want to be able to send a message to a user via email or sms, given a date and time for example 10/24/2016 14:00:00 send a message to you one hour before, I am using nodemailer to send via email, and twilio to send via sms, but the question is how do I program the event to do what I want, a user to register an event, and from that event I want all those who are subscribed to that event, to receive a notification when the event is about 1hs before. Someone who had done something similar, I would appreciate your help.

Update I use redis to store sessions, and maybe I can also take advantage of redis to use cron-cluster. Has anyone tried this module, and how has it gone?

javascript nodejs crontab

asked by Kevin AB 14.10.2016 в 21:58

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score 2 · Answer 1

With this code you can execute a function at a certain time (every day):

"use strict";

function tarea(){
    console.log('acá va la tarea', new Date());
}

function lanzarSiempreALaHora(hora, minutos, tarea){
    var ahora = new Date();
    console.log('lanzado',ahora);
    var momento = new Date(ahora.getFullYear(), ahora.getMonth(), ahora.getDate(), hora, minutos);
    if(momento<=ahora){ // la hora era anterior a la hora actual, debo sumar un día
        momento = new Date(momento.getTime()+1000*60*60*24);
    }
    console.log('para ser ejecutado en',momento,momento.getTime()-ahora.getTime());
    setTimeout(function(){
        tarea();
        lanzarSiempreALaHora(hora,minutos,tarea);
    },momento.getTime()-ahora.getTime());
}

lanzarSiempreALaHora(21,10, tarea);

The lanzarSiempreALaHora function is the one that adds tasks / functions. I understand that you already know how to make a function that sends mails or SMS.

Notes

A problem may occur if the machine where the program is running has a time change. If that could happen, this simplified version would not work (the first time I would execute the task at the wrong time).

The task can be parameterized by passing an anonymous function and using the parameters to set the values (that is only necessary within a cycle):

example:

lanzarSiempreALaHora(10, 30, function(nombre, mail){
    envair_mail(nombre, mail);
}(nombre, mail));