Is there any way to create durable objects bindings on the fly with api or sdk for each users or may

Is there any way to create durable objects bindings on the fly with api or sdk for each users or maybe I'm missing something. A basic tutorial on scalibility would be appreciated if possible.

AAshish Rawat Is there any way to create durable objects bindings on the fly with api or sdk f...

Ashley•9/28/24, 9:15 AM

See https://developers.cloudflare.com/durable-objects/best-practices/access-durable-objects-from-a-worker/, you would have a binding for a given DO (implemented by a class in your code) and then create DOs on the fly using whatever mechanism works for you (e.g. create a DO using a userId with idFromName). So the DO creation is dynamic, it’s not like other bindings where you create a resource and then you interact with one resource with an ID, with DOs you bind to a class + then generate millions of resources (if you need)

John Spurlock•9/29/24, 2:47 PM

important metrics for sqlite-backed DOs already in graphql, thanks!

JVictorV•9/29/24, 4:52 PM

Does anyone have a good way to uniquely identify websocket connections? I have a simple map of id -> websocket that i want to keep in sync even when the ws hibernates or the DO is evicted from memory

Matt Silverlock•9/29/24, 5:13 PM

Set tags when you accept the WebSockets: https://developers.cloudflare.com/durable-objects/api/websockets/#acceptwebsocket

Cloudflare Docs

WebSockets | Cloudflare Durable Objects docs

WebSockets are long-lived TCP connections that enable bi-directional, real-time communication between client and server.

JJikyu Would it be possible to use drizzle / run drizzle migrations against the new DO ...

zwily•9/29/24, 9:17 PM

same question here! drizzle may need to make another adapter for it

1.1.1.1APP•9/29/24, 10:01 PM

DNS over Discord: Invite

Invite DNS over Discord to your server with https://dns-over-discord.v4.wtf/invite

Or, use the bot anywhere by adding it to your account with https://dns-over-discord.v4.wtf/invite/user

Nick•9/30/24, 6:07 AM

Is there any way to get notified when a new DO is created or updated? I guess you can build it yourself with Alarms, but wondering if something built in

NNick Is there any way to get notified when a new DO is created or updated? I guess yo...

Hello, I’m Allie!•9/30/24, 7:27 AM

There is not

HHello, I’m Allie!There is not

Nick•9/30/24, 7:28 AM

cool that's what i thought, thanks

Nick•9/30/24, 7:30 AM

sorry, another question, does the new workers logs stuff work on Durable Object logs?

NNick sorry, another question, does the new workers logs stuff work on Durable Object ...

Hello, I’m Allie!•9/30/24, 7:31 AM

Not sure, I would try it and see?

Nick•9/30/24, 7:32 AM

alright, i'll give it a bash at the weekend

Nick•9/30/24, 7:45 AM

actually just did it now. It seeeems to be coming through.

Nick•9/30/24, 7:45 AM

Hello was said comes from the DO

Yota•9/30/24, 8:13 AM

Even though I performed a single INSERT operation, 27 Storage Operations were counted. Why is that? How is this calculated?

Yota•9/30/24, 8:29 AM

no, but there are only 5 records

Yota•9/30/24, 8:30 AM

will try index

Yota•9/30/24, 8:38 AM

I tried it, but I couldn't observe any difference

Yota•9/30/24, 9:24 AM

Okay. Thank you for the clarification

YYota Even though I performed a single INSERT operation, 27 Storage Operations were co...

Yota•9/30/24, 9:26 AM

So the original issue still isn’t resolved…

YYota Even though I performed a single INSERT operation, 27 Storage Operations were co...

lambrospetrou•9/30/24, 1:25 PM

What was the INSERT doing? You are billed for "rows" read/written by your query, not operations. Assuming you are referring to the SQLite DO.

Llambrospetrou What was the INSERT doing? You are billed for "rows" read/written by your query,...

Yota•9/30/24, 1:43 PM

this.

Yota•9/30/24, 1:43 PM

also, only this consume 26 read operation.

Yota•9/30/24, 1:44 PM

I tested several times in different condition and figured out that if the DO have multiple tables(8 tables in total) the number increased.
If i removed other tables, the read count reduced but it still count 6 read.

Noah•9/30/24, 3:24 PM

Hey, I can't make a new durable object :

Cannot create binding for class 'Trainer' because it is not currently configured to implement durable objects. Did you forget to apply a --new-class migration to it? [code: 10061]

Cannot create binding for class 'Trainer' because it is not currently configured to implement durable objects. Did you forget to apply a --new-class migration to it? [code: 10061]

But if I try to add it

npx wrangler deploy --new-class Trainer
✘ [ERROR] Unknown arguments: new-class, newClass

npx wrangler deploy --new-class Trainer
✘ [ERROR] Unknown arguments: new-class, newClass

In my wrangler I have

[[durable_objects.bindings]]
name = "DURABLE_TRAINER"
class_name = "Trainer"
[[migrations]]
tag = "v1"
new_classes = ["Trainer"]

[[durable_objects.bindings]]
name = "DURABLE_TRAINER"
class_name = "Trainer"
[[migrations]]
tag = "v1"
new_classes = ["Trainer"]

I already did it once and then I deleted my durable object via dashboard, how to remake one ?

NNoah Hey, I can't make a new durable object : ``` Cannot create binding for class 'T...

Hello, I’m Allie!•9/30/24, 3:27 PM

Try just running

wrangler deploy

wrangler deploy

Noah•9/30/24, 3:28 PM

Yeah that's what gives me

  Cannot create binding for class 'Trainer' because it is not currently configured to implement
  durable objects. Did you forget to apply a --new-class migration to it? [code: 10061]

  Cannot create binding for class 'Trainer' because it is not currently configured to implement
  durable objects. Did you forget to apply a --new-class migration to it? [code: 10061]

Noah•9/30/24, 3:28 PM

and I tried with different wrangler version, currently i'm on 3.78.12

NNoah Yeah that's what gives me ``` Cannot create binding for class 'Trainer' becaus...

cloudkite•9/30/24, 5:05 PM

Use a different tag, for example tag = “v1.1”

Noah•9/30/24, 6:19 PM

Well I finally resolved the issue by deleting the existing worker, made a new worker with different name, then migrate my page on the new worker

Noah•9/30/24, 6:20 PM

But ty! I'll try

Original message was deleted

Yota•9/30/24, 6:22 PM

I tired: durable-objects but the number was not changed.

YYota also, only this consume 26 read operation.

lambrospetrou•9/30/24, 7:29 PM

Hey, I suggest taking a look at the examples in https://developers.cloudflare.com/durable-objects/best-practices/access-durable-objects-storage/#examples

Aside from your billing question about the rows, you seem to be using promises when the API is synchronous, and also

one()

one()

does not return null, it will throw when it doesn't find a result.

YYota I tested several times in different condition and figured out that if the DO hav...

lambrospetrou•9/30/24, 7:30 PM

To clarify something again, the

rowsRead

rowsRead

you get is not the number of results. It's the number of rows read by SQLite to satisfy your query. So, if you do joins, scans, etc, and only end up with 1 row, you are not just charged for 1 row, but all the rows that had to be read to answer your query.
Having correct and good indices on your tables to answer your queries without scanning the whole table is important.

Llambrospetrou Hey, I suggest taking a look at the examples in https://developers.cloudflare.co...

Yota•9/30/24, 8:55 PM

Thanks but I have read all the materials you guys provided.
The reason why doing this is to remove errors.

Llambrospetrou To clarify something again, the `rowsRead` you get is not the number of results....

Yota•9/30/24, 8:59 PM

I understand that. But what I am saying is that only one read should not consume this number of read because it does not make sense to scan other tables when I just want to get one row. FYI, there is no foreign key in every 8 tables and there are only 6 records in total

Yota•9/30/24, 9:05 PM

I will try researching good indices anyway. Thanks for the answer.

Ggeelen FYI `.exec` takes a type parameter, so you can avoid casting: ```ts const user ...

Yota•9/30/24, 11:45 PM

Cool

thank you for the info!

Ggeelen FYI `.exec` takes a type parameter, so you can avoid casting: ```ts const user ...

Isaac McFadyen•10/1/24, 1:23 AM

Just an addendum here in case anyone sees this in the future that this is for typing only - if the row isn't actually a User no error will be thrown, it will show as a User to Typescript but not actually be a User object

1.1.1.1APP•10/1/24, 7:53 PM

DNS over Discord: GitHub

View the DNS over Discord source code on GitHub at https://dns-over-discord.v4.wtf/github

Suman!•10/1/24, 8:39 PM

Hi guys,
Is the latency between the Worker and the Durable object expected to be around 100-160ms provided that they both are in the same location?

Larry•10/1/24, 9:23 PM

Does write coalescing apply to SQLite storage? I'm particularly worried about the atomicity described in the docs (and quoted below) for non-SQL storage.

If you invoke put() (or delete()) multiple times without performing any await in the meantime, the operations will automatically be combined and submitted atomically. In case of a machine failure, either all of the writes will have been stored to disk or none of the writes will have been stored to disk.

LLarry Does write coalescing apply to SQLite storage? I'm particularly worried about th...

Hello, I’m Allie!•10/1/24, 10:10 PM

AFAIK, no, but it doesn’t have to, since the storage is synchronous anyway

HHello, I’m Allie!AFAIK, no, but it doesn’t have to, since the storage is synchronous anyway

Larry•10/2/24, 12:44 AM

I'm concerned about consistency. As a made up example, let's say I have to update the account balance which is a row in the accounts table whenever there is a withdrawl which is a row in the withdrawls table. If I do the one and something crashes before I can complete the other, does the 1st get rolled back?

LLarry I'm concerned about consistency. As a made up example, let's say I have to updat...

Isaac McFadyen•10/2/24, 12:57 AM

Theoretically this should be done in a batch (where a batch using the DO SQLite API is just semicolon-seperated statements I believe), and if it's done in a batch then yes it's automatically done as part of a SQLite transaction and would be rolled back.

IIsaac McFadyen Theoretically this should be done in a batch (where a batch using the DO SQLite ...

lambrospetrou•10/2/24, 9:33 AM

Yes, using the

.batch([query_1, query_2])

.batch([query_1, query_2])

function will use SQLite transactions under the hood so you can make sure both queries either commit or rollback. https://developers.cloudflare.com/d1/build-with-d1/d1-client-api/#dbbatch
edit: Oops, sorry, I thought you were talking about D1. But the same works for the DO by what Isaac mentioned.

Llambrospetrou Yes, using the `.batch([query_1, query_2])` function will use SQLite transactio...

Hello, I’m Allie!•10/2/24, 9:45 AM

Actually, haven't checked yet, but does