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package util
import "io"
// NopReadCloser turns a supplied io.Reader into io.ReadCloser with a nop Close() implementation
func NopReadCloser(r io.Reader) io.ReadCloser {
return &nopReadCloser{r}
}
// NopWriteCloser turns a supplied io.Writer into io.WriteCloser with a nop Close() implementation
func NopWriteCloser(w io.Writer) io.WriteCloser {
return &nopWriteCloser{w}
}
// ReadCloserWithCallback adds a customizable callback to be called upon Close() of a supplied io.ReadCloser
func ReadCloserWithCallback(rc io.ReadCloser, cb func()) io.ReadCloser {
return &callbackReadCloser{
ReadCloser: rc,
callback: cb,
}
}
// nopReadCloser turns an io.Reader -> io.ReadCloser with a nop Close()
type nopReadCloser struct{ io.Reader }
func (r *nopReadCloser) Close() error { return nil }
// nopWriteCloser turns an io.Writer -> io.WriteCloser with a nop Close()
type nopWriteCloser struct{ io.Writer }
func (w nopWriteCloser) Close() error { return nil }
// callbackReadCloser allows adding our own custom callback to an io.ReadCloser
type callbackReadCloser struct {
io.ReadCloser
callback func()
}
func (c *callbackReadCloser) Close() error {
defer c.callback()
return c.ReadCloser.Close()
}
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