如何将io.Reader转换为io.ReadCloser？ [重复]

Question

This question already has an answer here:

• Golang io/ioutil NopCloser 2 answers

I have an io.Reader that doesn't require closing:

stringReader := strings.NewReader("shiny!")

And I want to pass it to a method that receives an io.ReadCloser

func readAndClose(source io.ReadCloser) {
    ...
}

How do I turn the io.Reader into a io.ReadCloser without specially creating a struct that implements the Close method?

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Answer 1

If you're certain that your io.Reader doesn't require any actual closing, you can wrap it with an ioutil.NopCloser.

From the godoc:

NopCloser returns a ReadCloser with a no-op Close method wrapping the provided Reader r.

So we can apply it like:

stringReader := strings.NewReader("shiny!")
stringReadCloser := ioutil.NopCloser(stringReader)