hostname is actually a nice one, haven't thought about that.

IItsWendell hostname is actually a nice one, haven't thought about that.

A

asp•8/20/21, 10:56 AM

It also makes it easy to see which DO the request is going to when using

wrangler tail -f pretty

wrangler tail -f pretty

wrangler tail -f pretty

wrangler tail -f pretty

A

asp•8/20/21, 11:07 AM

speaking of URLs in DO requests, you can modify pretty much every part of it as long as it conforms to the URI spec

A

asp•8/20/21, 11:10 AM

so something like

GET user://username/posts/1

GET user://username/posts/1

GET user://username/posts/1

GET user://username/posts/1 is possible, if you want

J

John Spurlock•8/20/21, 5:09 PM

If you are in the Durable Objects open beta, you will also be able to view the logs and requests sent to each Durable Object. This is a great tool to help you understand and debug the interactions between your Worker and a Durable Object.

BBrizy That's awesome, will definitely help scaling this

I

ItsWendellOP•8/20/21, 6:09 PM

What's the scale you need? Millions of websockets per channel? Is the primary channel always the same or dynamically created?

GGreg-McKeon Paid tier does included some usage, free tier does not yet (but coming soon)

K

kavinplays•8/20/21, 6:23 PM

is it coming?

K

kavinplays•8/20/21, 6:23 PM

if that's true, i am gonna mess around with miniflare's version

DDeleted User Is it possible to call a DO from another DO? Tried to do so but it crashes.

C

codefrau•8/20/21, 9:25 PM

Works for me

H

Hello, I’m Allie!•8/20/21, 9:40 PM

Might be me missing something, but is it possible to call a Namespace if it isn't a part of the same script?

HHello, I’m Allie!Might be me missing something, but is it possible to call a Namespace if it isn'...

J

John Spurlock•8/20/21, 9:41 PM

Yes, it's just a binding - can even be called by the classic non-module-style workers

JJohn Spurlock Yes, it's just a binding - can even be called by the classic non-module-style wo...

H

Hello, I’m Allie!•8/20/21, 9:42 PM

So two Namespaces cannot share the same class name on the same account, then?

HHello, I’m Allie!So two Namespaces cannot share the same class name on the same account, then?

J

John Spurlock•8/20/21, 9:43 PM

Actually you can have multiple namespaces with the same script+class name in the same account. In this case each namespace will have separate data storage. Think dev/staging/prod etc.

JJohn Spurlock Actually you can have multiple namespaces with the same script+class name in the...

H

Hello, I’m Allie!•8/20/21, 9:44 PM

So then how would you designate them in the bindings?

HHello, I’m Allie!So then how would you designate them in the bindings?

J

John Spurlock•8/20/21, 9:44 PM

The binding points to a namespace by id

J

John Spurlock•8/20/21, 9:45 PM

just like kv

JJohn Spurlock The binding points to a namespace by id

H

Hello, I’m Allie!•8/20/21, 9:48 PM

Very confused now. I was reading the docs, and it mentions a binding variable, and a class name, but no mention of a Namespace ID anywhere.

HHello, I’m Allie!Very confused now. I was reading the docs, and it mentions a binding variable, a...

J

John Spurlock•8/20/21, 9:55 PM

Ah do you mean with

wrangler

wrangler

? I'm not sure how it maps to the underlying model - I believe it has a concept of environments, perhaps it creates one namespace per env? Not sure. You can always get a list of your DO namespaces with

GET https://api.cloudflare.com/client/v4/accounts/<account-id>/workers/durable_objects/namespaces

GET https://api.cloudflare.com/client/v4/accounts/<account-id>/workers/durable_objects/namespaces

GET https://api.cloudflare.com/client/v4/accounts/<account-id>/workers/durable_objects/namespaces

GET https://api.cloudflare.com/client/v4/accounts/<account-id>/workers/durable_objects/namespaces

W

Wallacy•8/20/21, 10:53 PM

Anyone knows how to compress a gzip text on Workers? to/and/or Durable Objects? ... I know that i can create a new response and put a gzip content, then call the .text() e get the content decoded . But i dont know to to send a plain text and get a gzip using only the workers.

The ideia is store more than the current 32kib of data... I have a 100kb text that can be easy be compressed to 16kib;

WWallacy Anyone knows how to compress a gzip text on Workers? to/and/or Durable Objects? ...

J

John Spurlock•8/20/21, 10:57 PM

I don't think it's exposed as a runtime call. It would be cool if CF supported

CompressionStream

CompressionStream

CompressionStream

CompressionStream https://caniuse.com/mdn-api_compressionstream

J

John Spurlock•8/20/21, 10:58 PM

But you'd quickly burn through your CPU limits

JJohn Spurlock I don't think it's exposed as a runtime call. It would be cool if CF supported ...

W

Wallacy•8/20/21, 11:00 PM

That or the storage.put using some gzip (o other compression) argument.

Aasp You can do this with a parameter or a header, or you could set it as the hostnam...

M

mikeysee•8/21/21, 5:00 AM

awesome thanks

M

mikeysee•8/21/21, 6:58 AM

How do people unit test their durable objects? I have been trying to use some of the helper classes from miniflare (https://github.com/mrbbot/miniflare/blob/2cca9aea04/src/kv/do.ts) but I get the following errors in jest:

Test suite failed to run

    Cannot find module '../generated/offsets' from '../../node_modules/tz-offset/src/tz-offset.js'

    Require stack:
      C:/dev/me/tinkering-with-durable-objects/node_modules/tz-offset/src/tz-offset.js
      C:/dev/me/tinkering-with-durable-objects/node_modules/node-cron/src/scheduled-task.js
      C:/dev/me/tinkering-with-durable-objects/node_modules/node-cron/src/node-cron.js
      C:/dev/me/tinkering-with-durable-objects/node_modules/miniflare/dist/index.js
      src/projections/ProjectionDurableObject.test.ts

Test suite failed to run

    Cannot find module '../generated/offsets' from '../../node_modules/tz-offset/src/tz-offset.js'

    Require stack:
      C:/dev/me/tinkering-with-durable-objects/node_modules/tz-offset/src/tz-offset.js
      C:/dev/me/tinkering-with-durable-objects/node_modules/node-cron/src/scheduled-task.js
      C:/dev/me/tinkering-with-durable-objects/node_modules/node-cron/src/node-cron.js
      C:/dev/me/tinkering-with-durable-objects/node_modules/miniflare/dist/index.js
      src/projections/ProjectionDurableObject.test.ts

Test suite failed to run

    Cannot find module '../generated/offsets' from '../../node_modules/tz-offset/src/tz-offset.js'

    Require stack:
      C:/dev/me/tinkering-with-durable-objects/node_modules/tz-offset/src/tz-offset.js
      C:/dev/me/tinkering-with-durable-objects/node_modules/node-cron/src/scheduled-task.js
      C:/dev/me/tinkering-with-durable-objects/node_modules/node-cron/src/node-cron.js
      C:/dev/me/tinkering-with-durable-objects/node_modules/miniflare/dist/index.js
      src/projections/ProjectionDurableObject.test.ts

Test suite failed to run

    Cannot find module '../generated/offsets' from '../../node_modules/tz-offset/src/tz-offset.js'

    Require stack:
      C:/dev/me/tinkering-with-durable-objects/node_modules/tz-offset/src/tz-offset.js
      C:/dev/me/tinkering-with-durable-objects/node_modules/node-cron/src/scheduled-task.js
      C:/dev/me/tinkering-with-durable-objects/node_modules/node-cron/src/node-cron.js
      C:/dev/me/tinkering-with-durable-objects/node_modules/miniflare/dist/index.js
      src/projections/ProjectionDurableObject.test.ts

GitHub

miniflare/do.ts at 2cca9aea0412f874f68dfbd768eb132b276d8575 · mrbbo...

Fully-local simulator for Cloudflare Workers. Contribute to mrbbot/miniflare development by creating an account on GitHub.

Mmikeysee How do people unit test their durable objects? I have been trying to use some of...

M

MrBBot•8/21/21, 8:37 AM

are you setting the

moduleFileExtensions

moduleFileExtensions

moduleFileExtensions

moduleFileExtensions Jest option? if you are, make sure you've got

"json"

"json"

"json"

"json" included in that array

M

mikeysee•8/21/21, 8:37 AM

oh lol apparently I was and indeed just adding "json" makes it work

M

mikeysee•8/21/21, 8:37 AM

thanks!

M

mikeysee•8/21/21, 8:38 AM

BTW @mrbbot while I have you, is there a reason

DurableObjectId

DurableObjectId

DurableObjectId

DurableObjectId isnt exported?

M

MrBBot•8/21/21, 8:40 AM

probably just forgot

, you should be able to do

import { DurableObjectId } from "miniflare/dist/modules/do"

import { DurableObjectId } from "miniflare/dist/modules/do"

import { DurableObjectId } from "miniflare/dist/modules/do"

import { DurableObjectId } from "miniflare/dist/modules/do", the next version will make it much easier to use individual components like this

M

mikeysee•8/21/21, 11:57 AM

RraRaRa Hmm there was a nice limitations page that pretty much answered that question fo...

J

John Spurlock•8/21/21, 9:40 PM

you can do

setTimeout

setTimeout

and they pretty much always fire, but not if the object needs to be destroyed (colo goes down, or service upgrade) or runs out of runtime. For the latter, I believe the cloudflare team said that they are working on an update to ensure they will fire more consistently in the future (search the scrollback), but no public docs for that yet.

RraRaRa Ok great! This is really powerful way to make "serverless" multiplayer games. Ju...

J

John Spurlock•8/21/21, 9:50 PM

Like all serverless platforms, you have to architect around possible downtime for any reason like network outage, or rolling service upgrades. For something like a timer, you might want to use

setTimeout

setTimeout

for the 99% case, but also store the timer in state and have a cron that runs every minute as a fallback, the cron is guaranteed to run even if the DO is recreated

RraRaRa Yeah gotcha! If DO is re-created for some reason, I assume it's like any new DO,...

J

John Spurlock•8/21/21, 9:53 PM

the in-memory state will be cleared - yes like websockets, but you can access the same persistent storage using

state.storage

state.storage

state.storage

state.storage

J

John Spurlock•8/21/21, 9:53 PM

which won't help you for websockets : )

J

John Spurlock•8/21/21, 9:54 PM

Just curious if this is production ready

Depends on your production needs. For a game, maybe. Officially, it's not even GA yet, so not production-ready from an official point of view. Not even billed yet!

H

Hello, I’m Allie!•8/21/21, 9:59 PM

Hey @john.spurlock, don't know if this is a projected usecase, or if there is even a way to do this with DO, but would it be possible for a DO to receive a stream, and then pass it on to many clients? So, for example, a music streaming platform, that received one input, and streamed it to all of the connected clients?

HHello, I’m Allie!Hey @john.spurlock, don't know if this is a projected usecase, or if there is ev...

J

John Spurlock•8/21/21, 10:01 PM

I believe @kentonv_cf said streaming requests and responses work inside DOs (like between the entry-point worker and the DO), but I've not tried it myself. Would be a cool proof of concept, would need to be unbound though, or you'd run out of cpu quickly.

JJohn Spurlock I believe @kentonv_cf said streaming requests and responses work inside DOs (lik...

H

Hello, I’m Allie!•8/21/21, 10:02 PM

Or a flat-rated handoff API, where you'd pass the connection into it, and then it would handle splitting and transmitting it, without it counting as CPU time.

hostname is actually a nice one, haven't thought about that.

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