Using azure eventgrid with nginx

Question

Pulumi · Accepted Answer

When integrating Azure Event Grid with an NGINX server, the typical use case involves configuring NGINX to receive webhooks from Event Grid. Here's how you can set this up using Pulumi:

Azure Event Grid Topic: This is an endpoint where the events are sent. You first need to create an Event Grid topic.
Azure Event Grid Subscription: Once the topic is in place, you create a subscription to this topic. The endpoint for this subscription will be the NGINX server where you want the events to be sent.
NGINX Server Configuration: On the server side, you will need to have an NGINX server configured to accept POST requests on a certain endpoint and do something meaningful with the data from Event Grid.

In the given Pulumi code, I will show you how to create an Event Grid topic and an Event Grid subscription with a hypothetical endpoint. You would replace the endpoint with your actual NGINX server's endpoint.

Here's what the Pulumi TypeScript program would look like for setting this up:

import * as pulumi from "@pulumi/pulumi";
import * as azure from "@pulumi/azure-native";

// Create an Azure Resource Group
const resourceGroup = new azure.resources.ResourceGroup("resourceGroup");

// Create an Event Grid Topic in the Resource Group
const topic = new azure.eventgrid.Topic("topic", {
    resourceGroupName: resourceGroup.name,
    location: resourceGroup.location,
});

// NGINX server's URL to receive the Event Grid events
const nginxEndpointUrl = "<YOUR_NGINX_SERVER_URL>";

// Create an Event Grid Subscription to the Topic
const subscription = new azure.eventgrid.EventSubscription("subscription", {
    scope: topic.id,
    destination: {
        endpointType: "WebHook",
        properties: {
            endpointUrl: nginxEndpointUrl,
        },
    },
    eventDeliverySchema: "EventGridSchema",
});

// Export the topic and subscription details
export const topicName = topic.name;
export const topicEndpoint = topic.endpoint;
export const subscriptionId = subscription.id;

Make sure to replace <YOUR_NGINX_SERVER_URL> with the actual URL where NGINX is set up to handle webhooks.

In this program:

We import the necessary modules from Pulumi.
We create a new Azure resource group, which is a container that holds related resources.
We create an Event Grid topic, which is the central point for an event hub.
We set up a subscription to the topic specifying a WebHook as the endpoint type and providing the endpoint URL of the NGINX server.
We export important identifiers that can be used to interact with the resources.

Once you have deployed this Pulumi program, you will need to ensure your NGINX server is set up to handle POST requests at the endpoint you provided. This typically involves setting up a server block in your NGINX config that listens for the Event Grid data, and ensuring your server is reachable from the internet if necessary. Here's a simplified example of how your NGINX configuration might look:

server {
    listen 80;
    server_name my-event-handler.example.com;

    location /eventgrid/webhook {
        proxy_pass http://localhost:3000; # Pass to a local web service handling the events
        proxy_http_version 1.1;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection keep-alive;
        proxy_set_header Host $host;
        proxy_cache_bypass $http_upgrade;
        proxy_read_timeout 90;
    }
}

The NGINX server is configured to listen to HTTP requests and proxy them to a local service running on port 3000 which would process the Event Grid events. This is very basic and might need additional security settings and logic to handle the Event Grid messages properly.

Please ensure you also follow Azure's security recommendations for production systems, such as validating Event Grid Event signatures and ensuring your endpoint is only accessible to trusted sources.