hats

Communicating with NATS using the HTTP protocol.

Installation

go install github.com/RussellLuo/hats@latest

Usage

$ hats -h
Usage of hats:
  -config string
    	YAML/JSON file to read configuration from
  -nats string
    	The URL of the NATS server (default "nats://127.0.0.1:4222")
  -pub_addr string
    	The listen address of the publishing server (default ":8080")
  -pub_key string
    	The auth key for the endpoints of the publishing server
  -sub_stream -sub_stream
    	The JSON config of a single stream (Set multiple -sub_stream for multiple streams)
  -sub_webhook_key string
    	The auth key of the default webhook
  -sub_webhook_url string
    	The URL of the default webhook (default "http://127.0.0.1:8080/webhook")

Prerequisites

Start a JetStream enabled NATS server (docs):

docker network create nats
docker run --name nats --network nats -p 4222:4222 -d nats -js

Create a stream (docs):

nats stream add ORDERS --subjects='ORDERS.*'

Quick Start

Using the default webhook

Run the hats server:

hats -sub_stream='{"name":"ORDERS","consumers":[{"durable_name":"ORDERS_CONS"}]}'

For complex scenarios, you can also use a config file:
$ cat hats.yaml
sub:
  streams:
  - name: ORDERS
    consumers:
    - durable_name: ORDERS_CONS

$ hats -config=hats.yaml

Publish a message:

curl -XPOST 'http://127.0.0.1:8080/pub?subject=ORDERS.new' \
  -H 'Content-Type: application/json' \
  -d '{"order_id": "123"}'

The published message will be consumed by the default webhook handler, see logs of the hats server.

Using your own webhook

Run the hats server:

hats \
  -sub_stream='{"name":"ORDERS","consumers":[{"durable_name":"ORDERS_CONS"}]}' \
  -sub_webhook_url='http://127.0.0.1:8081/your-own-webhook' \
  -sub_webhook_key='your-own-key'

Publish a message:

curl -XPOST 'http://127.0.0.1:8080/pub?subject=ORDERS.new' \
  -H 'Content-Type: application/json' \
  -d '{"order_id": "123"}'

The published message will be consumed by your own webhook handler, turn to your webhook server to see the results.

Documentation

Checkout the Godoc.

License

MIT

RussellLuo / hats