# Customisable Post-Actions

A Post-Action, is a callback that will be executed after a rule validate() method. This allow you to customise your process, according to the result of a rule.

You can:

• log informations,
• send webhook with data priviously processed,
• comment an issue or a PR,
• and much more!

# How does it work?

In your .rulesrc config file, you can add callback functions that will be called if the rule succeeds or not.

These callbacks are Runnable classes, that implementing the Runnable abstract class. The Runnable class will have a run() method with callbackType, RuleResult and args as arguments.

callbackType precise if the Runnable is called because the rule failed, succeed or if it always called. RuleResult is an object containing the result of the rule, and args is a custom object, with as many properties as you want.

# Create your own Runnable class

If you don't find a suitable Post-Action for your needs, you can easily create yours by extending the Runnable class.

Your Runnable class must have a name and implement the run() method as said in the previous section.

# CLI

Same as Rules creation, the easiest way to create it is to use our CLI: hygie-cli.

Simply run : npm run generate:runnable RUNNABLENAME.

This CLI will create your runnable file and add everything necessary in the project. You just have to focus on your business logic.

# Use of services

It you need particular Services, you have to declare them in your constructor.

For example:

constructor(private readonly myService: MyService)

NestJs dependency injection will handle everything.

# handlebars templating

If you want to allow templating (you want to!), you need to use the render() method provide by our Utils class.

Just have a look at the LoggerRunnable implementation:

run(ruleResult: RuleResult, args: LoggerArgs): void {
    switch (args.type) {
        case 'info':
            logger.info(render(args.message, ruleResult));
        break;
        case 'warn':
            logger.warn(render(args.message, ruleResult));
        break;
    }
}

The render() method need the string containing the template (in the args object), and the data provider: RuleResult which is the return by the validate() rule method.