singleton pattern with global in RSC is not supporting? | Next.js | Page 1

warm karma Aug 21, 2023, 9:35 AM

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While using the redis client as a singleton pattern to check the session in the rsc layout, the connection continuously occurred, so I checked it.

in those test code, why globalForTest.test values resetted to undefined?

is it bug? or am i doing something wrong?

broken yokeBOT Aug 21, 2023, 9:35 AM

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warm karma Aug 21, 2023, 10:14 AM

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ok when i check it's call seq, testSingleton called twice.

why it called again after rendered? 🤔

(0 => 1): testSingleton => (2): layout => (0 => 1): testSingleton

lament frigate Aug 21, 2023, 10:16 AM

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how are you doing the test?

warm karma Aug 21, 2023, 10:16 AM

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just with
next dev + app dir

lament frigate Aug 21, 2023, 10:17 AM

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and are those just froma single request or multiple requests

warm karma Aug 21, 2023, 10:17 AM

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just for every request, testSingleton sequence called twice

lament frigate Aug 21, 2023, 10:20 AM

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can i show you how i set up my singleton?

warm karma Aug 21, 2023, 10:22 AM

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sure! i'll test again with that method

warm karma Aug 21, 2023, 10:22 AM

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warm karma ok when i check it's call seq, testSingleton called twice. why it called again ...

this log for single request

lament frigate Aug 21, 2023, 10:22 AM

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I called it everywhere on the page so it should show up more than 2, but here it only show up once or twice

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ideally every request should show up once only

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but it might be inconsistencies with dev server. one should try in prod

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source

warm karma Aug 21, 2023, 10:27 AM

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Is it a correct for notion client to be created on every request?

lament frigate Aug 21, 2023, 10:27 AM

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Im deploying it on Vercel so it has to be stateless. yes

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if you deploy it on non-serverless architecture, i believe you could just make global exports normally lol

lament frigate Aug 21, 2023, 10:28 AM

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lament frigate Im deploying it on Vercel so it has to be stateless. yes

i.e nothing can persists between requests

warm karma Aug 21, 2023, 10:30 AM

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lament frigate i.e nothing can persists between requests

even is it with non-serverless?

lament frigate Aug 21, 2023, 10:30 AM

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Vercel is serverless so no, that doesn't apply

warm karma Aug 21, 2023, 10:40 AM

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In prod it works as expected.
In dev, keep got "The server is running out of memory, restarting to free up memory", it's why i dig this stuff.
maybe this is causing a memory leak in the dev. (Importing twice in rsc?)
I will debug heap and check second import is disposed. if not i will write a gh issue for it.
thank you!

lament frigate Aug 21, 2023, 10:42 AM

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No problem!

#singleton pattern with global in RSC is not supporting?