Create a io.Reader from a local file

Question

I would like to open a local file, and return a io.Reader. The reason is that I need to feed a io.Reader to a library I am using, like:

Answer 1

The type *os.File implements the io.Reader interface, so you can return the file as a Reader. But I recommend you to use the bufio package if you have intentions of read big files, something like this:

file, err := os.Open("path/file.ext")
// if err != nil { ... }

return bufio.NewReader(file)