Code accompanying the blog post "Latency at the Edge with Rust/WebAssembly and Postgres" Part 1 and Part 2.

Common setup

Visit Neon and create a database, say, todo-db, with the following table:

CREATE TABLE todos (
  id SERIAL PRIMARY KEY,
  title TEXT NOT NULL,
  completed BOOLEAN NOT NULL
);

Creating a Hyperdrive

You need to create a Hyperdrive instance only once but update wrangler.toml for each project.

Replace the connection string with the one from the Neon dashboard.

npx wrangler hyperdrive create todo-db-hyperdrive --caching-disabled --connection-string "postgres://alex:[email protected]/dbname"

Add the following to wrangler.toml in each rust-hyperdrive-* project:

[[hyperdrive]]
binding = "todo-db-hyperdrive"
id = "<your-hyperdrive-id>"

Setting the DATABASE_URL secret

For all rust-direct-* projects, set the following environment variables. Alternatively, you can use the "Integration" tab in the Cloudflare Worker's dashboard to add the Neon integration, which does the same thing.

npx wrangler secret put DATABASE_URL

This will ask for the connection URL, which you can obtain from the Neon dashboard.

Deploying

npx wrangler deploy

Testing performance

Install oha using cargo install oha.

oha -c 1 -n 100 <your-worker-url>

Of course, you can adjust the concurrency and number of requests as needed.