What checks do you do in middleware that would be expensive though? - Cloudflare Developers

© 2026 Hedgehog Software, LLC

More

Communities Docs About Terms Privacy

Chaika

CChaika DOs are supported in a bunch of places, https://where.durableobjects.live/, supp...

x03

X

x03•3/26/24, 4:23 PM

Would this be the best solution over KV and D1 for storing sessions?

Chaika

CChaika What checks do you do in middleware that would be expensive though?

x03

X

x03•3/26/24, 4:23 PM

Every request that goes through has a session (KV) read and a database (D1) read

x03

X

x03•3/26/24, 4:24 PM

The app I'm building basically requires that I do this for security

Chaika

C

ChaikaOP•3/26/24, 4:24 PM

D1 uses Durable Objects under the hood, so pretty much the same pros/cons, D1 would probably be cheaper though

x03

X

x03•3/26/24, 4:25 PM

Ah makes sense

Chaika

C

ChaikaOP•3/26/24, 4:25 PM

I mean, could just have a expired at column in D1 and some cron job cleaning them up

Chaika

C

ChaikaOP•3/26/24, 4:26 PM

although Durable Objects could always be created closest to the visitor, whereas D1 is in one location

Chaika

CChaika I mean, could just have a expired at column in D1 and some cron job cleaning the...

x03

X

x03•3/26/24, 4:27 PM

Would the cron jobs be expensive? I've never worked with cron jobs on CF

Chaika

C

ChaikaOP•3/26/24, 4:28 PM

nah it's just a worker invocation

Chaika

C

ChaikaOP•3/26/24, 4:28 PM

plus whatever D1 units you'd incur by deleting those rows

Chaika

C

ChaikaOP•3/26/24, 4:29 PM

https://developers.cloudflare.com/workers/configuration/cron-triggers/ just a matter of configuring the cron time and adding the cron eventhandler

x03

X

x03•3/26/24, 4:30 PM

Alright, I guess I'll move sessions over to D1 and make a cron that deletes them.

PencilNavigator

P

PencilNavigator•3/26/24, 4:30 PM

Hi, for Cloudflare Dashboard is not working for some reason, is there a downtime or sth?

x03

X

x03•3/26/24, 4:31 PM

I'm still a little nervous about the Cloudflare pricing though, its very possible that my initial app launch could cost a lot, since I cant really estimate usage at the moment.

x03

X

x03•3/26/24, 4:31 PM

But I guess I'll see. Worst case scenario I can take the app down for a bit and switch to hosting on a VPS. I'd rather avoid that but if pricing becomes an issue that's the only choice I see as viable.

PencilNavigator

PPencilNavigator Hi, for Cloudflare Dashboard is not working for some reason, is there a downtime...

x03

X

x03•3/26/24, 4:32 PM

Yeah mine's down too

x03

X

x03•3/26/24, 4:32 PM

for certain pages

iamnotapipe

Iiamnotapipe this website is tripping me out. what exactly is it supposed to be telling me??

Chaika

C

ChaikaOP•3/26/24, 4:33 PM

click on a dc and you'll see where DOs run

PencilNavigator

PPencilNavigator Hi, for Cloudflare Dashboard is not working for some reason, is there a downtime...

Chaika

C

ChaikaOP•3/26/24, 4:33 PM

https://www.cloudflarestatus.com/incidents/b31dxdz60366

Cloudflare Dashboard and Cloudflare API service issues

iamnotapipe

Iiamnotapipe this website is tripping me out. what exactly is it supposed to be telling me??

Chaika

C

ChaikaOP•3/26/24, 4:33 PM

for example, DOs in South America run in East Coast https://where.durableobjects.live/colo/GRU/

Where Durable Objects Live

São Paulo, Brazil(colo) | Where Durable Objects Live

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

x03

X

x03•3/26/24, 4:35 PM

@Chaika this is kind of a broad question, but do you know of any tools that can estimate the cost of cloudflare services based on my expected daily users? Or anything similar to that

x03

X

x03•3/26/24, 4:36 PM

I could do calculations by hand, but I'm not sure how to estimate certain things, like how many requests does a user send on average

x03

X

x03•3/26/24, 4:37 PM

I guess I could actually just use the app myself like a normal user would, and tally up my requests that way

iamnotapipe

Iiamnotapipe what does it mean for a DO to "run"? i am not so sure how DO works .. is there a...

Chaika

C

ChaikaOP•3/26/24, 4:39 PM

Workers are V8 Isolates, a kind of single-threaded web environment javascript execution environment. Durable Objects are the same, also isolates, but the catch is there's only one per Durable Object ID in the entire world, and they have transactional consistent storage. Their storage has to be reliable, so they can only run in locations where there is several nearby DCs to replicate writes to

Chaika

C

ChaikaOP•3/26/24, 4:41 PM

Same region yea

Chaika

C

ChaikaOP•3/26/24, 4:41 PM

might fallover to a nearby dc but it won't go that far

Chaika

C

ChaikaOP•3/26/24, 4:41 PM

D1 DBs for example use DO Instances

iamnotapipe

Iiamnotapipe is a DO like a "singleton" that moves around??

Chaika

C

ChaikaOP•3/26/24, 4:45 PM

It doesn't move around, it stays in the same place once created.
You define a Durable Object in your code, for example for a session store. You then create a DO instance per user which gets created nearby and won't move, and you can save the session cookie/token in storage. Then, whenever the user goes to auth, you have the DO which is nearby to check for their auth. state.

jersey

J

jersey•3/26/24, 4:46 PM

cloudflare down? new domains not recognizing ;c

Chaika

C

ChaikaOP•3/26/24, 4:46 PM

You benefit from the fact that there's only one DO and storage is transactional/with locks, don't have to wait for eventual consistency like with KV, and it's nearby the user so low latency

jersey

Jjersey cloudflare down? new domains not recognizing ;c

Chaika

C

ChaikaOP•3/26/24, 4:46 PM

There is a current incident: https://www.cloudflarestatus.com/incidents/b31dxdz60366
You mean you added a new site, changed nameservers, and nothing yet? Would wait a while then, until incident is over

Cloudflare Dashboard and Cloudflare API service issues

Chaika

CChaika There is a current incident: https://www.cloudflarestatus.com/incidents/b31dxdz6...

jersey

J

jersey•3/26/24, 4:47 PM

yep, normally domain recognizes within 10 minutes

jersey

J

jersey•3/26/24, 4:47 PM

and now hours and still nothing

iamnotapipe

Iiamnotapipe what i mean by moves around is like, lets say this is for a game and i have a pl...

Chaika

C

ChaikaOP•3/26/24, 4:48 PM

You create a DO with a name and fetch it (or you can use random IDs, same idea though), like

    let id = env.MY_DURABLE_OBJECT.idFromName("us-west-player");

    let stub = env.MY_DURABLE_OBJECT.get(id);

    let response = await stub.fetch(request);

    let id = env.MY_DURABLE_OBJECT.idFromName("us-west-player");

    let stub = env.MY_DURABLE_OBJECT.get(id);

    let response = await stub.fetch(request);

That instance has its own storage and is created closest to the requester.

Isaac McFadyen

IIsaac McFadyen <https://flareutils.pages.dev/betterkv/>

x03

X

x03•3/26/24, 4:48 PM

A quick question. If my sessions NEVER change after being created, would it be better to just stick with BetterKV and cache sessions permanently or should I still switch to D1?

x03

X

x03•3/26/24, 4:48 PM

If a user agent or IP changes, I log the user out and require the creation of a new session

jersey

Jjersey yep, normally domain recognizes within 10 minutes

Chaika

C

ChaikaOP•3/26/24, 4:48 PM

What's the domain? It could be related to that incident which has been going on for 2 hours but could check it over anyway just to be sure nothing obvious is wrong

iamnotapipe

Iiamnotapipe thanks for juggling all these convos at once. when you fetch the DO, will it mov...

Chaika

C

ChaikaOP•3/26/24, 4:50 PM

They never move. So if it was created before in us-west, it would stay there. If it's a brand new DO (identified by name/id), it would be created closest to the requestor. You can pass it in a region hint too. They'd be copies of the same code yea, but with their own storage/location/memory/etc.
In some languages/concepts they're basically "actors".
You could create a Durable Object per game server, everyone connects and it fans out game messages/keeps game state. You could do it per session. Cloudflare uses Durable Objects per region to fan out Single URL Cache Purges, etc. Little instances of compute with storage that are globally consistent.

Chaika

CChaika What's the domain? It could be related to that incident which has been going on ...

jersey

J

jersey•3/26/24, 4:50 PM

i got multiple domains, on whois nameservers are on the domains and everything seems fine, and it just happened like within this 2 hours, pretty sure its because the incident. friend also same problem

jersey

Jjersey i got multiple domains, on whois nameservers are on the domains and everything s...

Chaika

C

ChaikaOP•3/26/24, 4:54 PM

Yea, probably related if it's just within the last few hours.
I would just double check dnssec isn't the problem, and that you're not presetting the nameservers at your registrar before adding the domain. Cloudflare recently added it so if you preset the nameservers at your Registrar to your account's defaults, it will pick two new ones when you add it. As long as they're equal to the ones you see in your Cloudflare dash for that website you're good though.

Chaika

CChaika Yea, probably related if it's just within the last few hours. I would just doubl...

jersey

J

jersey•3/26/24, 4:57 PM

the nameservers are equal, putting the domain first in cloudflare and then i copy the nameservers and put it in the registrar