Alert

Requirements

• Node.js v12 or higher

Getting Started

This package is available in the Node Package Repository and can be easily installed with npm or yarn.

$ npm i @slimio/alert
# or
$ yarn add @slimio/alert

Usage example

A simple addon that will throw an alarm every second...

import Addon from "@slimio/addon";
import alert from "@slimio/alert";
import metrics from "@slimio/metrics";

const test = new Addon("test");
const { Entity } = metrics(test);
const { Alarm } = alert(test);

const ALARM_INTERVAL = 1_000;
const MY_ENTITY = new Entity("MyEntity", {
    description: "Hello world!"
});

test.registerInterval(() => {
    new Alarm("hello world!", {
        correlateKey: "test_alarm",
        entity: MY_ENTITY
    });
}, ALARM_INTERVAL);

export default test;

API

The alert package return a function described by the following interface:

declare function Alert(addon: Addon): {
    Alarm: typeof Alarm;
};

Each instance of Alarm are unique to the local Addon.

Alarm

This section describe the methods and properties of Alarm Object.

constructor(message: string, options: Alert.ConstructorOptions)

Create a new Alarm Object.

new Alarm("hello world alarm", {
    correlateKey: "test_alarm"
});

Available options are described the following interface:

interface ConstructorOptions {
    severity?: SlimIO.AlarmSeverity;
    entity?: Metrics.Entity | string | number;
    correlateKey: string;
}

toJSON(): SlimIO.RawAlarm

Return a raw alarm. Refer to @slimio/tsd for more information.

Properties

declare class Alarm extends events {
    public cid: SlimIO.CID;
    public severity: number;
    public entity: Metrics.Entity | number;
    public message: string;
    public correlateKey: string;

    static DefaultSeverity: number;
    static Severity: SlimIO.AlarmSeverity;
}

Severity is defined in @slimio/tsd as follow:

enum AlarmSeverity {
    Critical,
    Major,
    Minor
}

The default severity is defined as 1 for Major.

Dependencies

Name	Refactoring	Security Risk	Usage
@slimio/is	Minor	Low	Type checker
@slimio/safe-emitter	⚠️Major	Medium	Safe emitter
@slimio/timemap	⚠️Major	Low	Time map
@slimio/utils	Minor	High	Bunch of useful functions

License

MIT