nodefaas

Node OpenFaas connector that utilises async/await and node-fetch

This library is inspired by the work of Austin Frey.

Installation

npm i nodefaas

Basic Usage

const faas = new NodeFaas();

console.log(await faas.invoke('figlet', 'Hello World'));

Advanced Usage

const FAAS_HOST = 'http://127.0.0.1:8080';

const FAAS_OPTIONS = {
    username: '{your admin username}',
    password: '{your admin password}',
    agentSettings: {  // Settings as per Node HTTP/HTTPS agent, e.g.:
        keepAlive: true,
        keepAliveMsecs: 1500,
    }; 
};

const faas = new NodeFaas(FAAS_HOST, FAAS_OPTIONS);

let response;
try {
    response = await faas.deploy('my-figlet', 'functions/figlet:latest');
    console.log(await faas.invoke('my-figlet', 'Hello World'));
    console.log(await faas.inspect('my-figlet'));
    response = await faas.remove('my-figlet');
} catch (e) {
    console.error(e);
}

Error Handling

All errors are thrown with a NodeFaasError object that extends the node Error object:

class NodeFaasError extends Error {
    constructor(message, status, statusText) {
        super(message);
        this.name = "NodeFaasError";
        this.status = status;                   // HTML Status codes
        this.statusText = statusText;
    }
}

Available Functions

invoke

faas.invoke(funcName, data, {options});

• funcName = the name of the FAAS function you want to invoke
• data = a string or object that you want to pass to the function
• options = an object that defines the return:
  • isJson: true | false - Sets expected return type as JSON
  • isBinaryResponse: true | false - Sets expected return type as Binary

Returns the data from the FAAS function

list

faas.list();

Returns a list of the available FAAS functions in a JSON object

inspect

faas.inspect(funcName);

• funcName - the name of the FAAS function you want to inspect

Returns statistics about a specific function as a JSON object

deploy

faas.deploy(funcName, image, {options});

• funcName - the name of the function you want to deploy (e.g. 'figlet-test')
• image - the name of the image you want to deploy (e.g. 'functions/figlet:latest')
• options {optional}
  • network - defaults to 'func_functions'

Returns deployment status

remove

faas.remove(funcName);

• the name of the function you want to remove (e.g. 'figlet-test')

Returns removal status

Tests

I have yet to create any unit tests for this project!

In the root of the project there is a file called

test-figlet.js

This file deploys a figlet to your server, runs some speed tests against it, and then removes it.

To execute this file, you will need to add an .env file to the root of the project (sample below)

FAASHOST = http://127.0.0.1:8080
FAASUSERNAME = admin
FAASPASSWORD = adminpasswordadminpassword
FAASITERATIONS = 1000

Once run, it will output something similar to the following:

...
Running test: 999
Time to run 1 figlet: 5.67ms
Time to run 10 figlets: 48.61ms
{
  name: 'nodefaas-figlet-99d9f6e3-e881-4131-9267-505c29766b98',
  image: 'functions/figlet:latest',
  invocationCount: 10803,
  replicas: 20,
  envProcess: '',
  availableReplicas: 1,
  labels: {
    faas_function: 'nodefaas-figlet-99d9f6e3-e881-4131-9267-505c29766b98'
  },
  annotations: { 'prometheus.io.scrape': 'false' },
  namespace: 'openfaas-fn'
}
Average time to run 1000 iterations:
Executing one: 22.76ms
Executing 10: 60.22ms
Removing test figlet
{ status: 202, statusText: 'Accepted', body: '' }