File Stream Operations Read Entire File for Metadata

[eshurakov]

Problem

Both readFileStreamOperation() and handleReadStream() call readFile() to get metadata, which reads the entire file content into memory. This causes two critical issues:

1. Inherits 10MB size limit: Stream operations fail on files >10MB despite being designed for streaming large files
2. Performance overhead: Large files are read twice (once for metadata, once for actual streaming)

Affected Code

• file-service.ts:1395 - readFileStreamOperation() calls this.read()
• file-handler.ts:107 - handleReadStream() calls this.fileService.readFile()

Impact

• Stream API cannot handle files larger than 10MB
• Unnecessary memory consumption and CPU cycles
• Increased latency before streaming begins

[whoiskatrin]

@eshurakov let me know if you are happy with this? #243

you can try the package from the pr:
npm i https://pkg.pr.new/cloudflare/sandbox-sdk/@cloudflare/sandbox@243