I don't know if the awakening (instantiating) occurs when you get the stub. My gut says that happens

LLarry I don't know if the awakening (instantiating) occurs when you get the stub. My g...

P

peachneo•1/2/25, 2:19 AM

great, thank you

A

anirudh•1/2/25, 6:42 AM

Is there a way to prevent a durable object from spawning in a certain location like Hong Kong? Reason - we are using Anthropic API (LLM) and they don't seem to allow API access from that region. I've looked at the docs and it doesn't seem to be possible.

Aanirudh Is there a way to prevent a durable object from spawning in a certain location l...

M

Max (@rozenmd)•1/2/25, 11:57 AM

not that I know of, but you can fetch

https://cloudflare.com/cdn-cgi/trace

https://cloudflare.com/cdn-cgi/trace

from the DO to work out where it is and return early if in HKG

Bbanny`Hello 👋 , are there any guides/examples on how one might do an `transfer` migra...

B

Beefp•1/2/25, 5:14 PM

sorry for the bump but did you find a solution to this?

ᴀ

ᴀkqj•1/2/25, 10:58 PM

i'm trying to use DO with sqlite

wrangler dev --remote

wrangler dev --remote

, to connect with KV

[[durable_objects.bindings]]
name = "MY_DURABLE1"
class_name = "DO1"

[[durable_objects.bindings]]
name = "MY_DURABLE2"
class_name = "DO2"

[[migrations]]
tag = "v2"
new_sqlite_classes = ["DO1", "DO2"]

[[durable_objects.bindings]]
name = "MY_DURABLE1"
class_name = "DO1"

[[durable_objects.bindings]]
name = "MY_DURABLE2"
class_name = "DO2"

[[migrations]]
tag = "v2"
new_sqlite_classes = ["DO1", "DO2"]

[[durable_objects.bindings]]
name = "MY_DURABLE1"
class_name = "DO1"

[[durable_objects.bindings]]
name = "MY_DURABLE2"
class_name = "DO2"

[[migrations]]
tag = "v2"
new_sqlite_classes = ["DO1", "DO2"]

[[durable_objects.bindings]]
name = "MY_DURABLE1"
class_name = "DO1"

[[durable_objects.bindings]]
name = "MY_DURABLE2"
class_name = "DO2"

[[migrations]]
tag = "v2"
new_sqlite_classes = ["DO1", "DO2"]

but running into

✘ [ERROR] Uncaught (in promise) Error: Error: This Durable Object is not backed by SQLite storage, so the SQL API is not available. SQL can be enabled on a new Durable Object class by using the `new_sqlite_classes` instead of `new_classes` under `[[migrations]]` in your wrangler.toml, but an already-deployed class cannot be converted to SQLite (except by deleting the existing data).

✘ [ERROR] Uncaught (in promise) Error: Error: This Durable Object is not backed by SQLite storage, so the SQL API is not available. SQL can be enabled on a new Durable Object class by using the `new_sqlite_classes` instead of `new_classes` under `[[migrations]]` in your wrangler.toml, but an already-deployed class cannot be converted to SQLite (except by deleting the existing data).

✘ [ERROR] Uncaught (in promise) Error: Error: This Durable Object is not backed by SQLite storage, so the SQL API is not available. SQL can be enabled on a new Durable Object class by using the `new_sqlite_classes` instead of `new_classes` under `[[migrations]]` in your wrangler.toml, but an already-deployed class cannot be converted to SQLite (except by deleting the existing data).

✘ [ERROR] Uncaught (in promise) Error: Error: This Durable Object is not backed by SQLite storage, so the SQL API is not available. SQL can be enabled on a new Durable Object class by using the `new_sqlite_classes` instead of `new_classes` under `[[migrations]]` in your wrangler.toml, but an already-deployed class cannot be converted to SQLite (except by deleting the existing data).

is there a way to delete the DO since I don't see any DO in dashboard or how to mitigate this error?

F

Fernando Barroso•1/3/25, 7:29 PM

Hello all! Does anyone know if there’s a way to pass W3C Trace Context headers to a durable object when calling it via RPC? Or would it be necessary to use vanilla fetch with HTTP Headers for that?

J

Jürgen Leschner•1/3/25, 9:05 PM

FYI - this is just a heads up regarding Astro and Durable Objects
It appears that the current astro/cloudflare adapter is unable to build a worker which exports classes for durable objects
This means that even if you use workers assets with Astro, you still can't combine your durable object code with other Astro SSR code in one worker.
I have filed https://github.com/withastro/adapters/issues/494
Repro in https://github.com/jldec/astro-do/pull/1

GitHub

Cloudflare adapter is unable to export Durable Object classes · Iss...

Astro Info Astro v5.1.2 Node v22.11.0 System macOS (arm64) Package Manager pnpm Output server Adapter @astrojs/cloudflare Integrations @astrojs/tailwind Describe the Bug When attempting to use Dura...

GitHub

attempt to add durable object - not working by jldec · Pull Request...

pnpm dev currently fails with
20:15:59 [WARN] [config] The adapter @astrojs/cloudflare has limited support for "sharp". Certain features may not work as expected.
20:15:59 [types]...

K

Kalu•1/4/25, 9:03 PM

Hello,
I don't understand the size limit of the store, I'd like to make a figma-like, so I have a big json from 100k to 3Mo that I need to be able to mutate, as main backup I use R2, for use with hibernation websocket I need to put it in the store but from what I see you can only put value a 128 Ko.
Is that really the limit? Is Durable object really usable for this situation?

KKalu Hello, I don't understand the size limit of the store, I'd like to make a figma-...

1

1984 Ford Laser•1/4/25, 10:11 PM

Can you split big json into multiple parts?

K

Kalu•1/4/25, 10:15 PM

This could make the coding too complicated

C

christianklotz•1/4/25, 10:53 PM

First time playing with DOs here but in the context of workers for platforms.

Do I understand this correctly that DOs cannot be deployed with (an essentially untrusted) user script upload but they have to be defined as part of the main app?

So if I want to give a user script access to DOs, this would be done via bindings somehow?

Trying to wrap my head around this. Is there an example of how a

sayHello

sayHello

RCP or the alarm API could be called from a WFP user script?

Ggnomesgames It does! You can use the `script_name` field of your DO binding to point to an e...

W

WonderPandaDev•1/5/25, 9:38 PM

Hey I've been trying to get this to work for a while now. I have two different workers and I want to be able to connect to a Durable Object defined in Worker B from Worker A. I've got both the script_name set as well as the service binding defined but when I run wrangler for for both separate projects the DO bindings always shows as [not connected]

W

WonderPandaDev•1/5/25, 9:38 PM

Hey I've been trying to get this to work for a while now. I have two different workers and I want to be able to connect to a Durable Object defined in Worker B from Worker A. I've got both the script_name set as well as the service binding defined but when I run wrangler for for both separate projects the DO bindings always shows as [not connected] even though the service binding shows [connected]

S

shubhamvscode•1/6/25, 8:37 AM

Hey,

Is there any timelimit for a durable object ?

Like i want to do something like:
sending email after 5 min of user signup so it's not working but if i do 10sec it works

Sshubhamvscode Hey, Is there any timelimit for a durable object ? Like i want to do something...

L

lucidplot•1/6/25, 8:56 AM

you can use a DO alarm or a queue

F

Fernando Barroso•1/6/25, 4:32 PM

hello all! In all examples I see alarms being scheduled for several seconds in the future. If I wanted to schedule immediate async work (i.e.

await this.ctx.storage.setAlarm(Date.now());

await this.ctx.storage.setAlarm(Date.now());

) could I run into any issues? Are there any gotchas here? I have been using this and it works, however, I have encountered (what seems to be) race conditions with this async work so I wonder if that immediate alarm has anything to do with this.

WWonderPandaDev Hey I've been trying to get this to work for a while now. I have two different w...

J

James•1/6/25, 4:35 PM

for local dev, route DO requests to the DO fetch worker instead of the direct binding since multiple DO bindings local doesn't really work

FFernando Barroso hello all! In all examples I see alarms being scheduled for several seconds in t...

J

James•1/6/25, 4:40 PM

maybe, since the whole DO is single threaded, you could run into scaling issues with that vs using a queue and worker instead, also DO CPU is more expensive than a worker

D

danjenkins•1/6/25, 11:20 PM

I swear there used to be a way to assign metadata to a websocket in durable objects and then find all the websockets that had that meta data? I can't find any docs on it now?

D

danjenkins•1/6/25, 11:22 PM

ah just like that found it

JJames for local dev, route DO requests to the DO fetch worker instead of the direct bi...

W

WonderPandaDev•1/7/25, 3:37 AM

Hey thanks for the tip I'll try this out! Is this documented anywhere? Still trying to ramp up on the expected experience when developing locally. Just to make sure I understand, are you saying I should keep the service binding and use that to forward the Request to the worker running in a separate wrangler dev process and then that can pass the request to the DO?

J

James•1/7/25, 4:18 AM

I made a proxy obj in front of the binding in my main app. If I’m running local, the proxy sends a fetch to localhost separate wrangler running the DO with the same payload and response signature. If not local, the proxy just calls the binding directly.

The fetch handler on the DO only runs locally, and instantiates the stub directly based on the request body.

Ddanjenkins I swear there used to be a way to assign metadata to a websocket in durable obje...

1

1984 Ford Laser•1/7/25, 6:56 AM

for anyone looking for this in the future, you do

this.state.acceptWebSocket(socket, topic)

this.state.acceptWebSocket(socket, topic)

, then to find connections by

topic

topic

you would do

this.state.getWebSockets(topic)

this.state.getWebSockets(topic)

11984 Ford Laser for anyone looking for this in the future, you do `this.state.acceptWebSocket(so...

D

danjenkins•1/7/25, 1:04 PM

my bad, in my haste I forgot to mention how its done!

BBrayden Here's a further example in action to help demonstrate as well: ``` public exec...

L

LarryOP•1/7/25, 1:59 PM

Thanks for giving that example. It's perfect for when you have an array of SQL statements you want to execute in a transaction. You can also take advantage of my favorite thing about the DO concurrency model by intermixing queries and code using

this.storage.transactionSync(() => {...})

this.storage.transactionSync(() => {...})

directly. In the callback, you can do a query, process it with code, do another query, etc. Then, every storage operation in that callback will either all-succeed or all-fail.

V

Vitor S•1/7/25, 3:56 PM

Someone can help me?

V

Vitor S•1/7/25, 3:56 PM

https://stackoverflow.com/questions/79336461/trying-to-use-websocket-hibernation-api

Stack Overflow

Trying to use Websocket Hibernation Api

I have a Cloudflare Worker that uses Durable Objects and WebSocket. However, the costs of WebSocket are high, so I decided to implement the Websocket Hibernation API (https://developers.cloudflare....

V

Vitor S•1/7/25, 3:57 PM

I tried to migrate from the standard websocket api to hibernation but I can't.

V

Vitor S•1/7/25, 3:57 PM

I changed the listeners to webSocketMessage() and webSocketClose(), theoretically that's all I need to change, right?

E

Ephemeros•1/7/25, 6:24 PM

what's the recommended way to keep a durable object staying up forever? e.g. to listen to the bsky firehose

and restart if it crashes somehow

or, should I use something other than a DO for that?

E

Ephemeros•1/7/25, 6:26 PM

hmm, maybe with repeated alarms to keep it awake?

Original message was deleted

E

Ephemeros•1/7/25, 7:26 PM

thanks for confirming!

VVitor S I changed the listeners to webSocketMessage() and webSocketClose(), theoreticall...

1

1984 Ford Laser•1/7/25, 9:11 PM

how are you accepting the connection? You need to use

this.state.acceptWebSocket(socket)

this.state.acceptWebSocket(socket)

11984 Ford Laser how are you accepting the connection? You need to use `this.state.acceptWebSocke...

V

Vitor S•1/8/25, 1:04 PM

Im using the acceptWebsocket()

11984 Ford Laser how are you accepting the connection? You need to use `this.state.acceptWebSocke...

V

Vitor S•1/8/25, 1:05 PM

async fetch(request) {
    const upgradeHeader = request.headers.get("Upgrade");

    if (upgradeHeader === "websocket") {
      const [client, server] = Object.values(new WebSocketPair());

      this.state.acceptWebSocket(server);

      const isFirst = this.sessions.size === 0;

      server.serializeAttachment({ isFirst });

      this.sessions.set(server, { isFirst });

      if (!isFirst) {
        console.log("sessions.size: ", this.sessions.size);

        // Debug
        for (let [ws, data] of this.sessions.entries()) {
          console.log("WS:", ws, "DATA:", data);
        }

        // find the connection with session.isFirst === true
        const [firstWs, firstSession] = [...this.sessions.entries()].find(([_, session]) => session.isFirst) || [];

        console.log("Found firstWs:", firstWs, "firstSession:", firstSession);

        if (firstWs) {
          console.log("Sending sync.")
          firstWs.send(JSON.stringify({ Evento: "sincronizar_fila", Comando: "" }));
        }
      }

      // When connect, send the stored musics 
      const storedMusics = await this.state.storage.get("musicas");
      if (storedMusics) {
        server.send(JSON.stringify({ Evento: "musicas", Comando: storedMusics }));
      }

      return new Response(null, { status: 101, webSocket: client });
    }

    return new Response("The request is not a websocket.", { status: 400 });
  }

async fetch(request) {
    const upgradeHeader = request.headers.get("Upgrade");

    if (upgradeHeader === "websocket") {
      const [client, server] = Object.values(new WebSocketPair());

      this.state.acceptWebSocket(server);

      const isFirst = this.sessions.size === 0;

      server.serializeAttachment({ isFirst });

      this.sessions.set(server, { isFirst });

      if (!isFirst) {
        console.log("sessions.size: ", this.sessions.size);

        // Debug
        for (let [ws, data] of this.sessions.entries()) {
          console.log("WS:", ws, "DATA:", data);
        }

        // find the connection with session.isFirst === true
        const [firstWs, firstSession] = [...this.sessions.entries()].find(([_, session]) => session.isFirst) || [];

        console.log("Found firstWs:", firstWs, "firstSession:", firstSession);

        if (firstWs) {
          console.log("Sending sync.")
          firstWs.send(JSON.stringify({ Evento: "sincronizar_fila", Comando: "" }));
        }
      }

      // When connect, send the stored musics 
      const storedMusics = await this.state.storage.get("musicas");
      if (storedMusics) {
        server.send(JSON.stringify({ Evento: "musicas", Comando: storedMusics }));
      }

      return new Response(null, { status: 101, webSocket: client });
    }

    return new Response("The request is not a websocket.", { status: 400 });
  }

async fetch(request) {
    const upgradeHeader = request.headers.get("Upgrade");

    if (upgradeHeader === "websocket") {
      const [client, server] = Object.values(new WebSocketPair());

      this.state.acceptWebSocket(server);

      const isFirst = this.sessions.size === 0;

      server.serializeAttachment({ isFirst });

      this.sessions.set(server, { isFirst });

      if (!isFirst) {
        console.log("sessions.size: ", this.sessions.size);

        // Debug
        for (let [ws, data] of this.sessions.entries()) {
          console.log("WS:", ws, "DATA:", data);
        }

        // find the connection with session.isFirst === true
        const [firstWs, firstSession] = [...this.sessions.entries()].find(([_, session]) => session.isFirst) || [];

        console.log("Found firstWs:", firstWs, "firstSession:", firstSession);

        if (firstWs) {
          console.log("Sending sync.")
          firstWs.send(JSON.stringify({ Evento: "sincronizar_fila", Comando: "" }));
        }
      }

      // When connect, send the stored musics 
      const storedMusics = await this.state.storage.get("musicas");
      if (storedMusics) {
        server.send(JSON.stringify({ Evento: "musicas", Comando: storedMusics }));
      }

      return new Response(null, { status: 101, webSocket: client });
    }

    return new Response("The request is not a websocket.", { status: 400 });
  }

async fetch(request) {
    const upgradeHeader = request.headers.get("Upgrade");

    if (upgradeHeader === "websocket") {
      const [client, server] = Object.values(new WebSocketPair());

      this.state.acceptWebSocket(server);

      const isFirst = this.sessions.size === 0;

      server.serializeAttachment({ isFirst });

      this.sessions.set(server, { isFirst });

      if (!isFirst) {
        console.log("sessions.size: ", this.sessions.size);

        // Debug
        for (let [ws, data] of this.sessions.entries()) {
          console.log("WS:", ws, "DATA:", data);
        }

        // find the connection with session.isFirst === true
        const [firstWs, firstSession] = [...this.sessions.entries()].find(([_, session]) => session.isFirst) || [];

        console.log("Found firstWs:", firstWs, "firstSession:", firstSession);

        if (firstWs) {
          console.log("Sending sync.")
          firstWs.send(JSON.stringify({ Evento: "sincronizar_fila", Comando: "" }));
        }
      }

      // When connect, send the stored musics 
      const storedMusics = await this.state.storage.get("musicas");
      if (storedMusics) {
        server.send(JSON.stringify({ Evento: "musicas", Comando: storedMusics }));
      }

      return new Response(null, { status: 101, webSocket: client });
    }

    return new Response("The request is not a websocket.", { status: 400 });
  }

V

Vitor S•1/8/25, 1:06 PM

I managed to migrate. But now I have problems with webSocketClose().

I need the connection that has isFirst = true to close all the others when it is closed.

V

Vitor S•1/8/25, 1:07 PM

what i tried:


async webSocketClose(ws) {
    let session = this.sessions.get(ws);

    this.sessions.delete(ws);

    if (session?.isFirst) {
      console.log("The first. Closing all");
      await this.state.storage.delete("musicas");
      for (let [otherWs] of this.sessions.entries()) {
        otherWs.close();
        this.sessions.delete(otherWs);
      }
    }

    ws.close();
  }


async webSocketClose(ws) {
    let session = this.sessions.get(ws);

    this.sessions.delete(ws);

    if (session?.isFirst) {
      console.log("The first. Closing all");
      await this.state.storage.delete("musicas");
      for (let [otherWs] of this.sessions.entries()) {
        otherWs.close();
        this.sessions.delete(otherWs);
      }
    }

    ws.close();
  }


async webSocketClose(ws) {
    let session = this.sessions.get(ws);

    this.sessions.delete(ws);

    if (session?.isFirst) {
      console.log("The first. Closing all");
      await this.state.storage.delete("musicas");
      for (let [otherWs] of this.sessions.entries()) {
        otherWs.close();
        this.sessions.delete(otherWs);
      }
    }

    ws.close();
  }


async webSocketClose(ws) {
    let session = this.sessions.get(ws);

    this.sessions.delete(ws);

    if (session?.isFirst) {
      console.log("The first. Closing all");
      await this.state.storage.delete("musicas");
      for (let [otherWs] of this.sessions.entries()) {
        otherWs.close();
        this.sessions.delete(otherWs);
      }
    }

    ws.close();
  }

V

Vitor S•1/8/25, 1:07 PM

but it is not closing the other connections

P

peachneo•1/9/25, 1:45 AM

is rpc just sugar over the fetch handler? Or does it have material performance differences (eg uses websockets or some different underlying transpoort)

Ppeachneo is rpc just sugar over the fetch handler? Or does it have material performance d...

M

Max (@rozenmd)•1/9/25, 11:27 AM

rpc is faster, less overhead

Ppeachneo is rpc just sugar over the fetch handler? Or does it have material performance d...

S

sathoro•1/9/25, 1:26 PM

websockets are HTTP with more overhead

Ssathoro websockets are HTTP with more overhead 👀

M

Milan•1/9/25, 3:37 PM

WebSockets start as an HTTP upgrade but once the connection is established it's just TCP.

M

Milan•1/9/25, 3:38 PM

https://datatracker.ietf.org/doc/html/rfc6455#section-1.7

IETF Datatracker

RFC 6455: The WebSocket Protocol

The WebSocket Protocol enables two-way communication between a client running untrusted code in a controlled environment to a remote host that has opted-in to communications from that code. The security model used for this is the origin-based security model commonly used by web browsers. The protocol consists of an opening handshake followed by ...

Ppeachneo is rpc just sugar over the fetch handler? Or does it have material performance d...

B

Beefp•1/9/25, 6:12 PM

rpc has limit of i think 1mb arguments/response over the wire

BBeefp rpc has limit of i think 1mb arguments/response over the wire

L

lambrospetrou•1/9/25, 7:15 PM

You can pass and return streams to overcome the 1mb limit. These streams can even be inside an object.

R

rob•1/9/25, 7:37 PM

if im looking to do a real time chat with rooms is partyserver the bst bet to get going? Is there any starter examples for that

M

marko.333•1/9/25, 9:11 PM

I'm a little uncertain of the concurrency rules for Durable Objects RPC calls?
If i have a DO("id1").doStuff() and many concurrent clients are connected to same DO instance ("id1"), then (roughly) all callers to doStuff() are serialized when a storage call is in-progress.
But i wanted to confirm that serialized execution is only triggered for storage calls - correct?
For example, what if the doStuff() implementation included some external calls (to another Worker, or external API fetch, ...)?
While await'ing for the external call to complete, will the other concurrent callers of doStuff() be able to continue execution (ie. an external API call will not cause all other concurrent callers to block)?
Thx.

Mmarko.333 I'm a little uncertain of the concurrency rules for Durable Objects RPC calls? ...

L

lambrospetrou•1/10/25, 9:49 AM

Yes, if you do an async IO call then other requests will run. If you want to fully block concurrency you can use https://developers.cloudflare.com/durable-objects/api/state/#blockconcurrencywhile

M

mihaaai•1/10/25, 1:58 PM

When using a sqlite-based Durable Objects, is Libsql for DO storage increasing the cursor memory with each read operation? Asking because we're trying to figure out final costs based also on the Duration GB-s constraint.

Rrob if im looking to do a real time chat with rooms is partyserver the bst bet to ge...

H

harshil1712•1/10/25, 2:28 PM

Hey, I have used PartyServer and love it because it makes it takes away a lot of boilerplate code. Also, I found this example in the repo: https://github.com/threepointone/partyserver/blob/main/fixtures/chat/README.md
Also, FYI, the repo says it is a Work in Progress

GitHub

partyserver/fixtures/chat/README.md at main · threepointone/partyse...

PartyKit, for Workers. Contribute to threepointone/partyserver development by creating an account on GitHub.

I don't know if the awakening (instantiating) occurs when you get the stub. My gut says that happens

Similar Threads