[FR]: Set chunk size on upload task

[cclaan]

Description

I may be missing something very obvious, but I see no way to set the upload chunk size from swift code for a 'FIRStorageUploadTask' created via FIRStorageReference putFile. e.g.

let uploadTask = remoteRef.putFile(from: fileURL, metadata: metadata)

1. Use case: allow custom chunk sizes so resumable uploads work by default
2. Currently the chunk size seems hard coded to a large value
3. I propose allowing custom chunk sizes

In FIRStorageUploadTask.m the chunk size seems to be set from the constant kGTMSessionUploadFetcherStandardChunkSize which is set to LLONG_MAX;

    GTMSessionUploadFetcher *uploadFetcher =
        [GTMSessionUploadFetcher uploadFetcherWithRequest:request
                                           uploadMIMEType:strongSelf->_uploadMetadata.contentType
                                                chunkSize:kGTMSessionUploadFetcherStandardChunkSize
                                           fetcherService:self.fetcherService];

Perhaps there is a way to modify this somewhere, but I can't find any documentation on it.

Thanks for any support.

API Proposal

let uploadTask = remoteRef.putFile(from: fileURL, metadata: metadata, chunkSize: myChunkSize )

Firebase Product(s)

Storage

[google-oss-bot]

I couldn't figure out how to label this issue, so I've labeled it for a human to triage. Hang tight.

[paulb777]

@cclaan Thank for the feature request. You're correct that there's currently no way to change chunkSize from LLONG_MAX

We've begun work on a Swift-only V2 API for Storage in #10161. chunkSize could work well as a default argument in the new API.

[paulb777]

@cclaan Would you provide more description about the value of being able to set the chunkSize. Why do you want to be able to manage the upload in smaller chunks?

[cclaan]

My use case is uploading ~20mb files from a phone with potentially poor network connection. Using smaller chunks is required so that the upload does not restart from scratch every time the network drops. ( Previously chunkSize was LLONG_MAX )