Cloudflare Developers•2mo ago

Once a DO is created, it does not move.

Once a DO is created, it does not move. I check where a DO is by fetching a /cdn-cgi/trace, then seeing the colo field

10 Replies

Sébastien Morel•2mo ago

maybe I miss something but is this endpoint kind of automatic on the DO ? https://durable-object/cdn-cgi/trace

Hard@Work•2mo ago

No, it is a fetch call you make from within the Worker. See https://github.com/helloimalastair/where-durableobjects-live/blob/main/apps/worker/src/DO.ts

GitHub

where-durableobjects-live/apps/worker/src/DO.ts at main · helloimal...

Tracking where Durable Objects are created, wherever you are in the world. - helloimalastair/where-durableobjects-live

Sébastien Morel•2mo ago

ha I see ok would it be correct to do the same approach to know where the worker is running? right now I did it within the DO, it seems to work, I suppose from within the worker it should work too ?

Hard@Work•2mo ago

Assuming it is a Worker handling an incoming fetch request, I would just get the colo from request.cf.colo Then you don't have to do a fetch call at all

Sébastien Morel•2mo ago

ok so first big thanks, for the colo in the DO, I can see my DO is in SJC (currently in France, 140ms is more than ok) 🙂 I don't see any cf.colo in the request on the worker though

"cf-connecting-ip": "xxx",
"cf-ipcountry": "FR",
"cf-ray": "xxx",
"cf-visitor": "{\"scheme\":\"https\"}",

"cf-connecting-ip": "xxx",
"cf-ipcountry": "FR",
"cf-ray": "xxx",
"cf-visitor": "{\"scheme\":\"https\"}",

that's the CF headers I get

Hard@Work•2mo ago

It's not in the headers, it is on the Request object itself Like:

export default {
  async fetch(req, env, ctx) {
    console.log("My colo is", req.cf.colo);
    // Do stuff
  }
}

export default {
  async fetch(req, env, ctx) {
    console.log("My colo is", req.cf.colo);
    // Do stuff
  }
}

Sébastien Morel•2mo ago

oh I need to see if I have that in Hono

Hard@Work•2mo ago

app.post('/', async (c) => {
  const colo = c.req.raw.cf?.colo
  ...
})

app.post('/', async (c) => {
  const colo = c.req.raw.cf?.colo
  ...
})

Sébastien Morel•2mo ago

yes 🙂 modulo some types missing right away

anirudh•2mo ago

You can also see here: https://where.durableobjects.live

Tracking where Durable Objects are created, wherever you are in the world.

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Programming

Once a DO is created, it does not move.