rebase: update k8s.io packages to v0.29.0

Signed-off-by: Niels de Vos <ndevos@ibm.com>

vendor/github.com/mxk/go-flowrate/flowrate/io.go

@@ -0,0 +1,133 @@
+//
+// Written by Maxim Khitrov (November 2012)
+//
+
+package flowrate
+
+import (
+	"errors"
+	"io"
+)
+
+// ErrLimit is returned by the Writer when a non-blocking write is short due to
+// the transfer rate limit.
+var ErrLimit = errors.New("flowrate: flow rate limit exceeded")
+
+// Limiter is implemented by the Reader and Writer to provide a consistent
+// interface for monitoring and controlling data transfer.
+type Limiter interface {
+	Done() int64
+	Status() Status
+	SetTransferSize(bytes int64)
+	SetLimit(new int64) (old int64)
+	SetBlocking(new bool) (old bool)
+}
+
+// Reader implements io.ReadCloser with a restriction on the rate of data
+// transfer.
+type Reader struct {
+	io.Reader // Data source
+	*Monitor  // Flow control monitor
+
+	limit int64 // Rate limit in bytes per second (unlimited when <= 0)
+	block bool  // What to do when no new bytes can be read due to the limit
+}
+
+// NewReader restricts all Read operations on r to limit bytes per second.
+func NewReader(r io.Reader, limit int64) *Reader {
+	return &Reader{r, New(0, 0), limit, true}
+}
+
+// Read reads up to len(p) bytes into p without exceeding the current transfer
+// rate limit. It returns (0, nil) immediately if r is non-blocking and no new
+// bytes can be read at this time.
+func (r *Reader) Read(p []byte) (n int, err error) {
+	p = p[:r.Limit(len(p), r.limit, r.block)]
+	if len(p) > 0 {
+		n, err = r.IO(r.Reader.Read(p))
+	}
+	return
+}
+
+// SetLimit changes the transfer rate limit to new bytes per second and returns
+// the previous setting.
+func (r *Reader) SetLimit(new int64) (old int64) {
+	old, r.limit = r.limit, new
+	return
+}
+
+// SetBlocking changes the blocking behavior and returns the previous setting. A
+// Read call on a non-blocking reader returns immediately if no additional bytes
+// may be read at this time due to the rate limit.
+func (r *Reader) SetBlocking(new bool) (old bool) {
+	old, r.block = r.block, new
+	return
+}
+
+// Close closes the underlying reader if it implements the io.Closer interface.
+func (r *Reader) Close() error {
+	defer r.Done()
+	if c, ok := r.Reader.(io.Closer); ok {
+		return c.Close()
+	}
+	return nil
+}
+
+// Writer implements io.WriteCloser with a restriction on the rate of data
+// transfer.
+type Writer struct {
+	io.Writer // Data destination
+	*Monitor  // Flow control monitor
+
+	limit int64 // Rate limit in bytes per second (unlimited when <= 0)
+	block bool  // What to do when no new bytes can be written due to the limit
+}
+
+// NewWriter restricts all Write operations on w to limit bytes per second. The
+// transfer rate and the default blocking behavior (true) can be changed
+// directly on the returned *Writer.
+func NewWriter(w io.Writer, limit int64) *Writer {
+	return &Writer{w, New(0, 0), limit, true}
+}
+
+// Write writes len(p) bytes from p to the underlying data stream without
+// exceeding the current transfer rate limit. It returns (n, ErrLimit) if w is
+// non-blocking and no additional bytes can be written at this time.
+func (w *Writer) Write(p []byte) (n int, err error) {
+	var c int
+	for len(p) > 0 && err == nil {
+		s := p[:w.Limit(len(p), w.limit, w.block)]
+		if len(s) > 0 {
+			c, err = w.IO(w.Writer.Write(s))
+		} else {
+			return n, ErrLimit
+		}
+		p = p[c:]
+		n += c
+	}
+	return
+}
+
+// SetLimit changes the transfer rate limit to new bytes per second and returns
+// the previous setting.
+func (w *Writer) SetLimit(new int64) (old int64) {
+	old, w.limit = w.limit, new
+	return
+}
+
+// SetBlocking changes the blocking behavior and returns the previous setting. A
+// Write call on a non-blocking writer returns as soon as no additional bytes
+// may be written at this time due to the rate limit.
+func (w *Writer) SetBlocking(new bool) (old bool) {
+	old, w.block = w.block, new
+	return
+}
+
+// Close closes the underlying writer if it implements the io.Closer interface.
+func (w *Writer) Close() error {
+	defer w.Done()
+	if c, ok := w.Writer.(io.Closer); ok {
+		return c.Close()
+	}
+	return nil
+}