Webhook Relay provides users an ability to directly subscribe to webhooks from their applications without using our stand-alone agent.
Socket server allows connecting to Webhook Relay service directly from your application using WebSocket protocol. Communication is done using JSON encoded messages. In order to start streaming, create a new bucket with your desired name.
Once you have a bucket, you can start receiving webhooks to your public endpoint (one public endpoint will be created by default upon bucket creation).
WebSockets will receive events with webhook data when both no outputs are defined or for every internal output specified. If you only have public outputs, neither WebSockets nor relay agent will receive them.
Protocol
Step 1: Connect
Your API keys allow multiple simultaneous connections. Connect to:
wss://my.webhookrelay.com/v1/socket
Step 2: Authenticate
You must authenticate before you can make any other requests. Generate a new key & secret pair in your tokens page (https://my.webhookrelay.com/tokens). To authenticate, send:
Once authenticated, you can request a stream. Buckets (https://my.webhookrelay.com/buckets) are used for grouping and routing. You can request multiple bucket streams. To subscribe, send:
Field buckets works as a filter, checking for bucket ID or bucket name. To subscribe to all buckets in your account, send only {"action":"subscribe"} message.
Once subscribed, you will receive the following message, confirming your stream:
All incoming webhooks will have event type set to webhook and attached meta field with additional information such as bucket ID, bucket name, input ID, input name:
In order to ensure that idle connections are not cut by the load balancers and routers, our servers are constantly sending both WebSocket protocol pings and regular messages over the open connection. For better availability, please add handler in your WebSocket client that responds to:
{
"type": "status",
"status": "ping"
}
with a:
{
"action": "pong"
}
message. You can view such handler in our JavaScript package here.
JavaScript Example
Here's a short example application written in JavaScript that subscribes to a stream of webhooks:
// client.js
const WebSocket = require('ws');
var server = 'wss://my.webhookrelay.com/v1/socket';
var reconnectInterval = 1000 * 3;
var ws;
var apiKey = process.env.RELAY_KEY;
var apiSecret = process.env.RELAY_SECRET;
var connect = function(){
ws = new WebSocket(server);
ws.on('open', function() {
console.log('connected, sending authentication request');
ws.send(JSON.stringify({ action: 'auth', key: apiKey, secret: apiSecret }));
});
ws.on('message', function incoming(data) {
console.log(data)
// parse message and if we have authenticated, subscribe to our bucket
var msg = JSON.parse(data);
if (msg.type === 'status' && msg.status === 'authenticated') {
ws.send(JSON.stringify({ action: 'subscribe', buckets: ['my-bucket'] }));
}
});
ws.on('error', function() {
console.log('socket error');
});
ws.on('close', function() {
console.log('socket closed, reconnecting');
setTimeout(connect, reconnectInterval);
});
};
connect();
Now, if you send a webhook to your public input endpoint, you should see something similar:
$ node client.js
{"type":"status","status":"authenticated","message":"connected successfully, subscribe to buckets"}
{"type":"status","status":"subscribed","message":"subscribed to buckets: 123"}
{"type":"webhook","meta":{"bucked_id":"89e44c32-27ff-4832-8655-8a42d3851b6f","bucket_name":"123","input_id":"ee4ac550-12a4-41a7-837d-dd3356ed1771","input_name":"Default public endpoint"},"headers":{"Content-Length":["15"],"User-Agent":["insomnia/6.0.2"],"Cookie":["__cfduid=dc244a014f0b1e2965544ddb483c3fe1b1525866866"],"Content-Type":["application/json"],"Accept":["*/*"]},"query":"","body":"{\"hi\": \"there\"}","method":"PUT"}
JavaScript SDK example
Javascript library is available via npm. Library source code is available on GitHub. It's written in Typescript is a thin wrapper around our WebSocket server client. It can only subscribe to buckets but cannot create/update/delete them.
To install it:
npm i webhookrelay-ws-client
Library usage
var ws = require(`webhookrelay-ws-client`);
// handler function has to accept a JSON string and parse on its own
var handler = function (data) {
console.log(data)
}
// create a client with specified token key and secret from https://my.webhookrelay.com/tokens and any buckets that
// can be created here https://my.webhookrelay.com/buckets. Handler function is called whenever there's a new message
var client = new ws.WebhookRelayClient('your-token-key', 'your-token-secret', ['bucket-1', 'bucket-2'], handler)
// connect starts a websocket connection to Webhook Relay
client.connect();
// app.js
var ws = require(`webhookrelay-ws-client`);
var apiKey = process.env.RELAY_KEY;
var apiSecret = process.env.RELAY_SECRET;
var handler = function (data) {
console.log(data)
}
var run = function () {
var client = new ws.WebhookRelayClient(apiKey, apiSecret, ['nodered'], handler)
client.connect();
// do some work
// disconnect whenever connection is no longer needed
setTimeout(function(){
console.log('disconnecting')
client.disconnect();
}, 10000);
}
run();
To run it:
node app.js
Now, whenever you send webhooks to your public endpoint https://my.webhookrelay.com/v1/webhooks/<your input ID>, they will be received inside your application. You can subscribe to multiple buckets. Each message will have a JSON string that you can parse:
