ceph-csi/vendor/github.com/grpc-ecosystem/grpc-gateway/utilities/readerfactory.go

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package utilities
import (
"bytes"
"io"
"io/ioutil"
)
// IOReaderFactory takes in an io.Reader and returns a function that will allow you to create a new reader that begins
// at the start of the stream
func IOReaderFactory(r io.Reader) (func() io.Reader, error) {
b, err := ioutil.ReadAll(r)
if err != nil {
return nil, err
}
return func() io.Reader {
return bytes.NewReader(b)
}, nil
}