Blogs | Page 3 of 4 | Madhurendra Sachan

Optimal way of scheduling long job – nodejs/js

January 29, 2016 by Madhurendra

If you are using nodejs for some backend stuff to schedule some-work, probably you will hate scheduling because of two factors You can’t set long timeout Timers are removed when process restart You would probably favor cronjobs for scheduling – or may be polling database for regular interval. Loading nodejs script every 5min is a … Read more

Javascript Domless events

December 3, 2015 by Madhurendra

Using jQuery or nodejs makes you addicted to pubsub (publish/subscribe) model. Nodejs has nattive support for event emitters but javascript doesn’t have. Events are only binded to a DOM, using which doesn’t make sense and its also adds to performance cost. To solve the problem i wrote a custom class which implements `on` and `emit` … Read more

Converting Opensource Dictionary to JSON

November 23, 2015November 23, 2015 by Madhurendra

Folddoc provide free online computer dictionary but they don’t have any standard tool or format to import dictionary in database or so. Dictionary can be downloaded form http://foldoc.org/Dictionary.txt Run the following nodejs code it will dump dictionary to OUTPUT.json and don’t forget to remove initial lines of disclaimer or they will add to your dictionary. … Read more

Importing large CSV file to Mongo.

November 2, 2016November 18, 2015 by Madhurendra

Someday you will need to import a large file to mongo or some other DBMS ,
You start writing code for achieving same using NodeJS, but when you run memory usage start increasing and either core of your CPU is at 100%.

Getting whatsapp statistics – WhatsappWeb

October 30, 2015 by Madhurendra

There are no tool available for whatsapp which give us how many messages a user has contributed to group, Sometimes you need. Whatsapp web exposes whatsapp to JS, whiche makes things more easy, I wrote a simple code which logs Number of messages sent by each user of group, obviously you need full conversation open … Read more

Redis Vs MongoDB

January 29, 2016October 10, 2015 by Madhurendra

Redis and Mongodb are considered to solve a common problem that “There is something wrong with RDBMS” So what is difference ? Redis is stored in memory and swapped with disk, So data is not lost and you can enjoy performance of your RAM. (Not to be confused with Memcached it is memory only database) … Read more

Why not nodejs v4.1.1

October 8, 2015October 1, 2015 by Madhurendra

Recently i updated nodejs installation to v4.1.1 using curl -sL https://deb.nodesource.com/setup_4.x | sudo -E bash – sudo apt-get install -y nodejs and i ended up fixing many bug in other modules, but i couldn’t move far in this decision. Nodejs has a history of breaking compatibility with older code in every new release, so if … Read more

Backup Server Configurations to Git

September 28, 2015 by Madhurendra

When you have multiple servers it pain to remember every configuration and it may take hours to configure servers again incase you need. It is also impractical to copy each files. There are few tools available but they come with overhead attached moreover its fun to write custom solutions 🙂 1. Create directory 2. cd … Read more

Cloning Server to New Hardware

October 4, 2015September 12, 2015 by Madhurendra

You can find many ways of cloning old server to new hardware, create diskimage and move to new hardware and if you have identical hardware use `dd` or similar tool to copy disks block by block, but if you have new hardware and want to move server without downtime and with no configuration change there … Read more

Adding ellipsis to long text

September 10, 2015 by Madhurendra

When you have some long division and you don’t want to wrap text or extend size of div, But instead you want to use add few `…` at end of text using CSS .wrapped{ overflow:hidden; white-space: nowrap; text-overflow: ellipsis; width: 300px; } Example : Text without text-overflow :Lorem ipsum dolor sit amet, consectetur adipiscing elit. … Read more