Scalingo Review App Manager

Small and lightweight utility that automatically stop & restart your review apps on Scalingo each working day.

Presentation

Who

This library may interest you if you :

• host your infrastructure on Scalingo platform
• use the mechanism of Review Apps (a.k.a. RA)
• are used to have multiple RA (at least 2) opened for more than a day

In particular, you will be concerned if you have enabled the option to "create review app for each new Pull Request".

Why

The firt goal of this library is to help you saving (a little bit of) money.

Another goal we have in mind is to reduce our consumption of useless IT resources.

We know that Scalingo must reserved physical servers in all cases and that the economy of resource consumption is insignificant at the scale ot the planet, but we believe that "a little bit" is even better than "not at all" 😉.

How

In order to use scalingo-review-app-manager :

1. add the library as a dependency in a Scalingo Node.js project
2. in your application code, declare a new ReviewAppManager
3. add an instruction to start the EcoMode
4. push & deploy your project on Scalingo

What

You can find a real production example here.

Pix Bot is a little web application hosted on Scalingo that help us – Pix – to automate internal processes and manage critical operations.

In particular, Pix Bot is responsible to manage all of our Review Apps (about 60 S-sized opened by day).

Thanks to scalingo-review-app-manager, we estimate that we save between 3500$ and 5000$ a year.

Basic Usage

1/ Install the dependency.

npm install scalingo-review-app-manager

2/ Declare a new ReviewAppManager and run the CRON-based "Eco Mode".

const ReviewAppManager = require('../index').ReviewAppManager;

const reviewAppManager = new ReviewAppManager('tk-us-DkjGg...', 'https://api.osc-fr1.scalingo.com');

reviewAppManager.startEcoMode().then(() => console.log('Eco Mode enabled.'));

Advanced usage

Custom stop & restart times

By default review apps will be shut down every week day at 7pm and will be restarted the day after (if it is a week day) at 8am.

You can customize the stop and restart times by passing stopCronTime and/or restartCronTime parameters (RegExp strings) to the ReviewAppManager constructor.

const options = {
  stopCronTime: '0 0 22 * * 1-5',
  restartCronTime: '0 0 6 * * 1-5'
};
(new ReviewAppManager(scalingoToken, scalingoApiUrl, options)).startEcoMode();

Ignoring some review apps

By default, all the review apps will be stopped and restarted according to stop & restart times.

You can ignore some review apps by passing ignoredReviewApps parameter (array of strings) to the ReviewAppManager constructor.

const options = {
  ignoredReviewApps: ['my-app-review-pr1', 'my-app-review-pr3']
};
(new ReviewAppManager(scalingoToken, scalingoApiUrl, options)).startEcoMode();

Scalingo pending operations limit management

The Scalingo API limits the numbers of applications scaling in the same time.

To deal with this limit, a mechanism of polling by application scaling is set up.

By default, the scaling status of each application is checked every 1000ms with a maximum of 10 attempts. These values can be parameterized in the options object of the ReviewAppManager constructor : pollTimeInterval (number, in ms) and pollMaxAttempts (number).

const options = {
  pollTimeInterval: 1000,
  pollMaxAttempts: 10
};
(new ReviewAppManager(scalingoToken, scalingoApiUrl, options)).startEcoMode();

Specifying cron jobs time zone

By default, the cron jobs are based on UTC server's local time zone.

You can set up a specific time zone with the timeZone option, cf. the list of available time zones.

const options = {
  timeZone: 'Europe/Paris',
};
(new ReviewAppManager(scalingoToken, scalingoApiUrl, options)).startEcoMode();

License

This software is released under the AGPL-3.0 license & supports modern environments.

Misc

The logo was in free downloaded on pngdownload.id after a search on Google Images with "non-commercial reuse" filter.