DO reads are only faster if you are close to the DO. Otherwise KV is faster.

Oh, like that

I thought they meant reads within the DO

So caching to KV isn't good idea?

I wouldnt use KV to cache a DO value though tbh I would just use the cache api

Depends on request rate

That, too

Do you mean caching responses from a DO, or DO Storage?

cache response from DO.

Then maybe

It depends on how fast your DO responds, how expensive you need, and how often it needs to update

For example if user has already voted today based on username or IP.

so I can store that he already voted in KV + Cache API and respond to them, so it doesn't need to read from DO again

Now everything works 🎉

The biggest problem that I face today is that get function for DOs actually returns undefined and not null if key does not exists

so:

js
let votes = await this.state.storage.get('votes');
if(votes === null) return MinecraftVoteDO.jsonResponse({ 'error': 0, 'info': 'success', 'data': { 'monthly': 0, 'total': 0 } });
return MinecraftVoteDO.jsonResponse({ 'error': 0, 'info': 'success', 'data': votes });

was returning me 500 error for so long

Basically

votes == null

or

typeof(votes) === 'undefined'

instead of

votes === null

would fix the issue.

KVs returns null while DOs returns undefined

"The type of the returned value will be whatever was previously written for the key, or undefined if the key does not exist."

Yeah took me probably an hour to realize this issue XD

Also it is possible to put class for Durable Object on different file instead of the main one?

In your main file just

export { MyClass } from './my-file'

I was doing import, so probably that's why it didn't worked thanks.

the other starter templates linked from https://developers.cloudflare.com/workers/learning/using-durable-objects/#uploading-a-durable-object-worker have DO class in different files from the main one

is there any 'hook' to know just before a DO goes away? like to quickly write to durable object storage API before the DO goes away

Not that I’m aware of

Pretty sure they have said they won't add an API for that given it can't be reliable for example on system crashes

Just realizing Durable Object storage has a limit of 128kb...