/nats-poc

Primary LanguageJavaScript

Agora

This belongs to a workshop based on queues and NATS, and showcases basic usage of NATS queues and also a case study on a chat application.

How to run it

  1. Start NATS in docker container:
docker run -p 4222:4222 -p 8222:8222 -p 6222:6222 --name gnatsd -ti nats:latest
  1. Install dependencies
cd node
npm install
  1. Open two new terminals, start gateway and persister processes:
node gateway.js A
node gateway.js B

node persister.js 1
node persister.js 2
node persister.js 3

NATS 101

Setup

Download NATS from http://nats.io, unpack it and run:

./gnatsd -m 8222

It enables two ports, 4222 for the procotol and 8222 with some small information site.

It can also be run via docker:

docker run -p 4222:4222 -p 8222:8222 -p 6222:6222 --name gnatsd -ti nats:latest

Protocol basics

Open two terminals, and telnet to port 4222.

$ telnet localhost 4222

Then you can subscribe to messages sent to foo.*:

sub foo.* 90

Then try publishing some message from second terminal:

pub foo.bar 5
hello