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•Created by Ivan on 4/29/2023 in #workers-help

Unable to perform multi-part upload for files

Hi all, I'm currently trying to use a worker to perform a multipart upload of a file on my front-end. Since my website is hosted on vercel, I have no choice but to tunnel my request through their APIs in order to reach my worker. As a result, I have a hard 8mb limit on the size of my function body. However, when I try to perform a multi-part upload, I get the following error

Error Encountered!
Error: completeMultipartUpload: Your proposed upload is smaller than the minimum allowed object size.
    at R2MultipartUpload.complete (/Users/ivanleo/Documents/Coding/schulz/tut/node_modules/@miniflare/r2/src/multipart.ts:490:15)
    at Object.fetch (/Users/ivanleo/Documents/Coding/schulz/tut/src/index.ts:99:30)
    at ServiceWorkerGlobalScope.[kDispatchFetch] (/Users/ivanleo/Documents/Coding/schulz/tut/node_modules/@miniflare/core/src/standards/event.ts:385:13)
    at Server.<anonymous> (/Users/ivanleo/Documents/Coding/schulz/tut/node_modules/@miniflare/http-server/src/index.ts:291:20)
POST /54cbb39f-863d-4365-bc33-d2c31f4a523c.mp4?action=mpu-complete&uploadId=LR5UYQuJToSuQ26G5v_pAYg-bfcsSA_kPKmjbGvhAHy2lqX0n9dFXaUnjZYKI3G-SIdYsBjCTg_3I1srvZqh3GYwK9Oi2GKtxEdhm5jZeV-4kc8hs6c8KaDEHV7Mod32Sa-WiThJoFe1IaWTv0cOF0wwebHBVsOooBky-edIwN8 400 Bad Request (42.35ms)

Error Encountered!
Error: completeMultipartUpload: Your proposed upload is smaller than the minimum allowed object size.
    at R2MultipartUpload.complete (/Users/ivanleo/Documents/Coding/schulz/tut/node_modules/@miniflare/r2/src/multipart.ts:490:15)
    at Object.fetch (/Users/ivanleo/Documents/Coding/schulz/tut/src/index.ts:99:30)
    at ServiceWorkerGlobalScope.[kDispatchFetch] (/Users/ivanleo/Documents/Coding/schulz/tut/node_modules/@miniflare/core/src/standards/event.ts:385:13)
    at Server.<anonymous> (/Users/ivanleo/Documents/Coding/schulz/tut/node_modules/@miniflare/http-server/src/index.ts:291:20)
POST /54cbb39f-863d-4365-bc33-d2c31f4a523c.mp4?action=mpu-complete&uploadId=LR5UYQuJToSuQ26G5v_pAYg-bfcsSA_kPKmjbGvhAHy2lqX0n9dFXaUnjZYKI3G-SIdYsBjCTg_3I1srvZqh3GYwK9Oi2GKtxEdhm5jZeV-4kc8hs6c8KaDEHV7Mod32Sa-WiThJoFe1IaWTv0cOF0wwebHBVsOooBky-edIwN8 400 Bad Request (42.35ms)

It seems to me like the individual upload portions succeed but then when it comes to the final step of completing the multipart upload, I get a 400 error because of the error that completeMultiPartUpload throws. I'm a bit confused as to how I might be able to fix this. I've tried to modify my partition function so that the last element is always at least 5MB. I originally started slicing from the front (Eg. 12mb file becomes 5 5 2 and the new algorithm would slice it as 2 5 5 ). Any help would be much appreciated. I am using NextJS with typescript and am happy to share source code if needed.

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