Database Setup
Create a Redis database using Upstash Console or
Upstash CLI. Select the global to minimize the
latency from all edge locations. Copy the UPSTASH_REDIS_REST_URL and
UPSTASH_REDIS_REST_TOKEN for the next steps.
Project Setup
We will use Fastly CLI for deployment, so please install
Fastly CLI.
Create a folder for your project and run fastly init. Select [2] JavaScript,
then [2] Empty starter for JavaScript
> fastly compute init
Creating a new Compute@Edge project.
Press ^C at any time to quit.
Name: [fastly-upstash]
Description:
Author: [enes@upstash.com]
Language:
[1] Rust
[2] JavaScript
[3] AssemblyScript (beta)
[4] Other ('bring your own' Wasm binary)
Choose option: [1] 2
Starter kit:
[1] Default starter for JavaScript
A basic starter kit that demonstrates routing, simple synthetic responses and
overriding caching rules.
https://github.com/fastly/compute-starter-kit-javascript-default
[2] Empty starter for JavaScript
An empty application template for the Fastly Compute@Edge environment which simply
returns a 200 OK response.
https://github.com/fastly/compute-starter-kit-javascript-empty
Choose option or paste git URL: [1] 2
Install @upstash/redis:
npm install @upstash/redis
Now, we will create a Fastly Compute service by running,
fastly compute publish. You need to add your Upstash database’s endpoint as a
backend and select 443 as its port.
> fastly compute publish
✓ Initializing...
✓ Verifying package manifest...
✓ Verifying local javascript toolchain...
✓ Building package using javascript toolchain...
✓ Creating package archive...
SUCCESS: Built package 'fastly-upstash' (pkg/fastly-upstash.tar.gz)
There is no Fastly service associated with this package. To connect to an existing service
add the Service ID to the fastly.toml file, otherwise follow the prompts to create a
service now.
Press ^C at any time to quit.
Create new service: [y/N] y
✓ Initializing...
✓ Creating service...
Domain: [supposedly-included-corgi.edgecompute.app]
Backend (hostname or IP address, or leave blank to stop adding backends): global-concise-scorpion-30984.upstash.io
Backend port number: [80] 443
Backend name: [backend_1] upstash
Backend (hostname or IP address, or leave blank to stop adding backends):
✓ Creating domain 'supposedly-smart-corgi.edgecompute.app'...
✓ Creating backend 'upstash' (host: global-concise-scorpion-30984.upstash.io, port: 443)...
✓ Uploading package...
✓ Activating version...
The Code
Update src/index.js as below:
import { Redis } from "@upstash/redis/fastly";
addEventListener("fetch", (event) => event.respondWith(handleRequest(event)));
async function handleRequest(event) {
const redis = new Redis({
url: "UPSTASH_REDIS_REST_URL",
token: "UPSTASH_REDIS_REST_TOKEN",
backend: "upstash",
});
const data = await redis.incr("count");
return new Response("View Count:" + data, { status: 200 });
}
Deploy
Deploy: fastly compute deploy
After deployment, the CLI logs the endpoint. You can check the logs with:
fastly log-tail --service-id=<YOUR_FASTLY_SERVICE_ID>
Run Locally
To run the function locally add the backend to your fastly.toml as below:
[local_server.backends.upstash]
url = "UPSTASH_REDIS_REST_URL"
Then run: fastly compute serve
