i am guessing maybe DB is more suitable for production level deployment for permissions? to ensure
i am guessing maybe DB is more suitable for production level deployment for permissions? to ensure consistency.
IThe "inconsistency" of KV would just mean that an update might take 60 seconds to propogate globally. If you're OK with 60-second delays when adding or removing permissions then KV would still be suitable, but if not then KV isn't for you.
Tyes, I did assume permissions are usually crucial for production environment best with zero latency and 100% consistency.
what about D1? that said, I actually stick to D1 for auth data for my development project... simply because D1 offers more free allowances.
what about D1? that said, I actually stick to D1 for auth data for my development project... simply because D1 offers more free allowances.
ID1 is single-region currently, so while you'd get consistency there you're definitely not going to get zero latency.
IIn general there's no such thing as zero-latency, 100% consistency - all databases are just trading one for the other, some fully (i.e. KV prioritizes speed, D1 prioritizes consistency) and some partially (i.e. in etcd you can choose to read possibly-stale values or consistent values and your app can make that choice itself)
APermissions doesn't change often. Firebase auth token cache auth tokens upto 1 hr by default. 60sec doesn't seems to be problem.
IYeah IMO 60 seconds is perfectly OK for permission use-cases. Even if you need to revoke permissions from a user quickly because of an issue, 60 seconds is very quick and won't give them much time to do anything dangerous.
IYou can also implement it as a tiered system: for most permission requests you can check KV, but then if there's something extremely sensitive (like billing details or a purchase or something) you can go back to a central DB that is consistent.
JHello!
Have way to use KV in local dev env? or an emulator?
Have way to use KV in local dev env? or an emulator?
HWrangler can emulate KV in a Worker for you
JI'm running a worker locally (
wrangler devwrangler kv key put ... --local <key> <value> but my <kvnamespace>.get in my worker always returns null. I tried listing them from the worker too, and there's no keys at all. Listing them with "kv key list --local" tells me they are there. I can also read them with kv key get. Any suggestions on where I should start to dig to figure it out?JAny example to use KV with Typescript? All examples I see, have bugs =/
JJWhat I did wrong?
Try to use Cloudflare KV, in
Try to use Cloudflare KV, in
npm run preview and in deploy Error adding key-value pair: Error: Error adding key-value pair: ReferenceError: env is not definedexport const runtime = 'edge';
export const putKV = async (key, value) => {
try {
await env.KV_PREVIEW.put(key, value);
return;
} catch (error) {
throw new Error(Error adding key-value pair: ${error});
}
};
WHow are you invoking putKV
WAnd where is env coming from there
W(May be better to ask in #next-on-pages )
J@Walshy | Deploying I dont know how to make this with TypeScript, try a lot of examples and tutorials.
But, I change to Node.JS standard code, and work.
In loca env: pass, not generate error but, not save in KVS.
Only work 100% in CF Worker.
But, I change to Node.JS standard code, and work.
In loca env: pass, not generate error but, not save in KVS.
Only work 100% in CF Worker.
THey folks, in reference to the above inaccurate metrics and free tier quota exhaustion, this fix has now been rolled out!
MHi, running into some weird eventual consistency behavior with KV - when updating a KV key value pair (via the API), accessing it via worker seemingly randomly returns the old version and switches back and forth to the new updated one. Any ideas? cacheTtl used to be set to 5 minutes, but this issue has been apparently occurring for the past 24 hours
Mwhen looking at the KV dashboard, the correct version is present there, but workers still return the old version, even after several hours
JHello.
Did u solve this issue?
Did u solve this issue?
T@Jax Please DM me the details of your KV namespace
AI'm using KV to cache browser screenshots as described in this doc: https://developers.cloudflare.com/browser-rendering/get-started/screenshots/
In that doc, the
In that doc, the
expirationTtl for the screenshots in KV is being set to 24 hours. My ideal would be to make the expiry much longer (e.g. 1 month), but with an implementation like an LRU cache where the TTL would reset whenever the value is read, so that only keys that haven’t been read for 1 month are evicted. Is there a way to accomplish something like that with KV, or is there another product that would be better suited for that kind of implementation? I did a search in discord and found kv, which suggests that KV’s expiration TTL isn’t the way to achieve this, but then because reading a value with a cacheTtl parameter resets any previous cacheTtl from a previous read, I thought there could be something there.
BIs there any plan in cloudflare to implement "kv but without cache"? I know I can use D1 / Durable Objects in some scenarios, but they both have some trade-offs, and to bypass the trade-off requires too much effort.
CWhy not just use R2?
BA very interesting alt method. I may consider this, though I doubt whether it can handle frequently CRUD.
CIt can handle it a lot better then KV does. KV is eventually consistent and should only be one write per key per second
Chttps://developers.cloudflare.com/r2/reference/consistency/ R2 is read after write/strongly consistent.
Although it may be worth mentioning: Why did you say Durable Objects has some trade offs you don't like? R2 is backed by DOs for metadata and then stores the actual objects elsewhere
Although it may be worth mentioning: Why did you say Durable Objects has some trade offs you don't like? R2 is backed by DOs for metadata and then stores the actual objects elsewhere
BFor my next purpose, I want to use it for de-duplicate. Each of my ID is 128-byte, and the durable objects' size limit is 128KB, so only 1k records will exceed the limit, which will happen in less than one second. Even the durable objects' with SQLite backend can be filled with only 16k records. Since I need to store at least 7 days data, it's far from my need.
BOh, that's first time I know that some part of KV is backed by DO.
But, from the document, I don't find any related to the cache time around the metadata in KV. I guess the cache policy is the same as value, right?
But, from the document, I don't find any related to the cache time around the metadata in KV. I guess the cache policy is the same as value, right?
Cahh ok, yea the max key size for R2 is 1,024 bytes and there's no bucket max
Oh, that's first time I know that some part of KV is backed by DO.R2 is, not KV
But, from the document, I don't find any related to the cache time around the metadata in KV. I guess the cache policy is the same as value, right?For KV yea should be the same, but that document I linked was about R2, not KV
Nhi. beginner here. i'm having trouble with accessing KV from a worker. i did the binding but keep getting errors
Nkeep getting "Property 'get' does not exist"
Nin the worker code, should i refer to the name or to the value of the binding?
Nwould appreciate any assistance
CWhatever you set
bindingenvCloudflare Docs
KV bindings allow for communication between a Worker and a KV namespace.
CIf you're using service worker format
addEventListener('fetch',... if i have that, which should i use for .get and .put, the name or the value?
Cwishlist_kvif i did that binding to the worker in the ui, do i need to declare or initialize that kv var before using it?
wishlist_kv.get(key)Cannot find name 'wishlist_kv'.and
Property 'put' does not exist on type '"wishlist_kv"'no, show more code though. If you're using module workers/exporting fetch, it's on env and not in global, there's a nice tutorial here: https://developers.cloudflare.com/kv/concepts/kv-bindings/#access-kv-from-workers
Cloudflare Docs
KV bindings allow for communication between a Worker and a KV namespace.
Ncode starts with
addEventListener('fetch', event => {
event.respondWith(handleRequest(event.request));
});
Ndo i need to add env there?
Cno, you're using the old only supported for some products service worker format which should have it as a global var
Ni'll have to read up on migrating to module workers?
CKV should work fine with service workers but module workers are a smarter thing to use for performance/more features/etc reasons, and not that hard if you're just starting to switch: https://developers.cloudflare.com/workers/reference/migrate-to-module-workers/
Otherwise would need to show more of the full code of the service worker
Otherwise would need to show more of the full code of the service worker
Cloudflare Docs
Write your Worker code in ES modules syntax for an optimized experience.
Nthanks
DI have some follow up questions for the same, can I DM you?
