How can I use Redis to return file data as range requests?

Question

I am in the process of replacing a basic file serving API call which looks like this:

return Results.File("myfile.pdf", MediaTypeNames.Application.Pdf, enableRangeProcessing: true);

If I store "myfile.pdf" as a byte array (AKA string?) in Redis, how can I later serve the file in a similar as I currently am?

Does Redis have the ability to return a string as a stream, and if it does, do range requests on that stream work as expected? (only transferring the minimum bytes required to fulfil the range request)

Guy Royse · Accepted Answer · 2024-08-06 15:01:55Z

0

You can't stream as such, but you can read the contents of the string in chunks using the StringLength and StringGetRange methods in StackExchange.Redis.

Wrapping this is a stream wouldn't be a terribly difficult exercise. And, honestly, if you're so inclined, wouldn't be a terrible open-source project. 😉

answered Aug 6, 2024 at 15:01

Guy Royse

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2 Comments

Jan Martin Over a year ago

Thanks Guy, do these functions really do what they say on the box, e.g. if I say give me bytes 1000 to 2000, will only 1000 bytes be transferred over the wire?

Guy Royse Over a year ago

Yes. Unless you blow past the end of the string, in which case you'll get whatever is left.

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