Drizzle Team•16mo ago

Instantiate a connection with PlanetScale in Cloudflare Workers

Hey, What would be the right way to instantiate a database connection with PlanetScale in Cloudflare workers and reuse it across different handlers? We cannot instantiate it outside the handler because we have no access to the environment variables :

const connection = connect({
    url: ENV,
    fetch: (url, init) => {
      delete init["cache"];
      return fetch(url, init);
    },
  });

 const db = drizzle(connection);

app.get("/users", async () => ...);

const connection = connect({
    url: ENV,
    fetch: (url, init) => {
      delete init["cache"];
      return fetch(url, init);
    },
  });

 const db = drizzle(connection);

app.get("/users", async () => ...);

So, we need to create a function where we can pass the env object as a parameter to access the environment variables:

export function db(env: ENV_VARIABLES) {
  const connection = connect({
    url: env.DATABASE_URL,
    fetch: (url, init) => {
      delete init["cache"];
      return fetch(url, init);
    },
  });

  return drizzle(connection);
}

export function db(env: ENV_VARIABLES) {
  const connection = connect({
    url: env.DATABASE_URL,
    fetch: (url, init) => {
      delete init["cache"];
      return fetch(url, init);
    },
  });

  return drizzle(connection);
}

And then use it in different handlers:

app.post("/users", async (context) => db.insert(users).values({...});
app.post("/posts", async (context) => db.insert(posts).values({...});

app.post("/users", async (context) => db.insert(users).values({...});
app.post("/posts", async (context) => db.insert(posts).values({...});

I wonder if this is a safe way to instantiate a connection and reuse it across different handlers with Cloudflare Workers?

1 Reply

Andrii Sherman•16mo ago

It's fine I guess. You can also have some sort of singleton pattern for that

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Instantiate a connection with PlanetScale in Cloudflare Workers