Function isKnownInMemoryReader

transfer.go:1016–1028

isKnownInMemoryReader reports whether r is a type known to not block on Read. Its caller uses this as an optional optimization to send fewer TCP packets.

(r io.Reader)

// block on Read. Its caller uses this as an optional optimization to
// send fewer TCP packets.
func isKnownInMemoryReader(r io.Reader) bool {
	switch r.(type) {
	case *bytes.Reader, *bytes.Buffer, *strings.Reader:
		return true
	}
	if r, ok := unwrapNopCloser(r); ok {
		return isKnownInMemoryReader(r)
	}
	if r, ok := r.(*readTrackingBody); ok {
		return isKnownInMemoryReader(r.ReadCloser)
	}
	return false
}

// bufioFlushWriter is an io.Writer wrapper that flushes all writes
// on its wrapped writer if it's a *bufio.Writer.