Hi,
I'm trying to save the file without blocking the HTTP request.
Is this possible?
#Saving a file through HTTP async
edgy birch
eager moat
you could use @Response() res
then res.end() to reply while running writeFile
eager moat
And how your controller’s method looks like?
eager moat
did something like this, but still
Don’t forget the await in the promise of writeFile after calling res.end()
edgy birch
Don’t forget the `await` in the promise of writeFile after calling `res.end()`
Why I should add 'await'? 🙂
robust eagle
Why I should add 'await'? 🙂
Do you want to make sure it fully writes to the disk without error before sending the response or do you want to have a floating promise?
edgy birch
Floating promise for now
edgy birch
do you have any idea? @robust eagle
robust eagle
What you have now shouldn't block the request
edgy birch
did something like this, but still
You mean this?
robust eagle
Yes. You probably don't actually need the res.end. the server should respond even if there's a floating promise
Just don't add the @Res() to the controller and nest should take care of sending a response for you
edgy birch
Yeah. But even though when I upload a file (I'm testing a large one) the response from server waits for a file to be uploaded. That's my controller and I start using yarn run:start
robust eagle
What do you mean here by "uploaded"? Do you mean saved to the disk, or just sent to the server?
edgy birch
saved to the disk
robust eagle
Do you have a multer module being used?
edgy birch
I think so? I added the @types/multer
and take a file as Express.Multer.File
robust eagle
No, like, MulterModule.register()
edgy birch
Hmm I havent used that
robust eagle
Okay, making sure. So it shouldn't be waiting to be written to disk to serve the response
Does it still wait even if your remove the @Response()?
edgy birch
Yes, thats my code:
robust eagle
Yeah, it shouldn't Wait to respond. Can you make a git repo with this? Unless multer is forcing the wait this should be responding immediately
Could you not have sent it publicly?
edgy birch
I mean it's kinda private repo
robust eagle
I'm not the only person who looks at this stuff/not the only one capable of investigating
robust eagle
I mean it's kinda private repo
Then make a reproduction that is public
edgy birch
OK 
edgy birch
I think I've found a "why" to my problem while I was doing a reproduction @robust eagle 🤣 The delay was not on the server side - but on the client. Just sending through network that file was very long and the writeFile was right away after it went through
robust eagle
Writing to disk is way faster then sending over an http request. That's why I was asking if you were certain it was waiting for the write to finish 😁