Support Close() in streaming decoder

pkg/apiserver/watch_test.go

@@ -241,7 +241,7 @@ func TestWatchRead(t *testing.T) {
 			}
 			objectCodec := api.Codecs.DecoderToVersion(objectSerializer, testInternalGroupVersion)
 
-			var fr io.Reader = r
+			var fr io.ReadCloser = r
 			if !protocol.selfFraming {
 				fr = framer.NewFrameReader(r)
 			}

pkg/runtime/helper.go

@@ -187,5 +187,5 @@ var DefaultFramer = defaultFramer{}
 
 type defaultFramer struct{}
 
-func (defaultFramer) NewFrameReader(r io.Reader) io.Reader { return r }
+func (defaultFramer) NewFrameReader(r io.ReadCloser) io.ReadCloser { return r }
 func (defaultFramer) NewFrameWriter(w io.Writer) io.Writer         { return w }

pkg/runtime/interfaces.go

@@ -82,7 +82,7 @@ type ParameterCodec interface {
 
 // Framer is a factory for creating readers and writers that obey a particular framing pattern.
 type Framer interface {
-	NewFrameReader(r io.Reader) io.Reader
+	NewFrameReader(r io.ReadCloser) io.ReadCloser
 	NewFrameWriter(w io.Writer) io.Writer
 }
 

pkg/runtime/serializer/json/json.go

@@ -214,7 +214,7 @@ func (jsonFramer) NewFrameWriter(w io.Writer) io.Writer {
 }
 
 // NewFrameReader implements stream framing for this serializer
-func (jsonFramer) NewFrameReader(r io.Reader) io.Reader {
+func (jsonFramer) NewFrameReader(r io.ReadCloser) io.ReadCloser {
 	// we need to extract the JSON chunks of data to pass to Decode()
 	return framer.NewJSONFramedReader(r)
 }
@@ -230,7 +230,7 @@ func (yamlFramer) NewFrameWriter(w io.Writer) io.Writer {
 }
 
 // NewFrameReader implements stream framing for this serializer
-func (yamlFramer) NewFrameReader(r io.Reader) io.Reader {
+func (yamlFramer) NewFrameReader(r io.ReadCloser) io.ReadCloser {
 	// extract the YAML document chunks directly
 	return utilyaml.NewDocumentDecoder(r)
 }

pkg/runtime/serializer/protobuf/protobuf.go

@@ -435,6 +435,6 @@ func (lengthDelimitedFramer) NewFrameWriter(w io.Writer) io.Writer {
 }
 
 // NewFrameReader implements stream framing for this serializer
-func (lengthDelimitedFramer) NewFrameReader(r io.Reader) io.Reader {
+func (lengthDelimitedFramer) NewFrameReader(r io.ReadCloser) io.ReadCloser {
 	return framer.NewLengthDelimitedFrameReader(r)
 }

pkg/runtime/serializer/streaming/streaming.go

@@ -38,16 +38,18 @@ type Encoder interface {
 type Decoder interface {
 	// Decode will return io.EOF when no more objects are available.
 	Decode(defaults *unversioned.GroupVersionKind, into runtime.Object) (runtime.Object, *unversioned.GroupVersionKind, error)
+	// Close closes the underlying stream.
+	Close() error
 }
 
 // Serializer is a factory for creating encoders and decoders that work over streams.
 type Serializer interface {
 	NewEncoder(w io.Writer) Encoder
-	NewDecoder(r io.Reader) Decoder
+	NewDecoder(r io.ReadCloser) Decoder
 }
 
 type decoder struct {
-	reader    io.Reader
+	reader    io.ReadCloser
 	decoder   runtime.Decoder
 	buf       []byte
 	maxBytes  int
@@ -57,7 +59,7 @@ type decoder struct {
 // NewDecoder creates a streaming decoder that reads object chunks from r and decodes them with d.
 // The reader is expected to return ErrShortRead if the provided buffer is not large enough to read
 // an entire object.
-func NewDecoder(r io.Reader, d runtime.Decoder) Decoder {
+func NewDecoder(r io.ReadCloser, d runtime.Decoder) Decoder {
 	return &decoder{
 		reader:   r,
 		decoder:  d,
@@ -105,6 +107,10 @@ func (d *decoder) Decode(defaults *unversioned.GroupVersionKind, into runtime.Ob
 	return d.decoder.Decode(d.buf[:base], defaults, into)
 }
 
+func (d *decoder) Close() error {
+	return d.reader.Close()
+}
+
 type encoder struct {
 	writer  io.Writer
 	encoder runtime.Encoder

pkg/runtime/serializer/streaming/streaming_test.go

@@ -19,6 +19,7 @@ package streaming
 import (
 	"bytes"
 	"io"
+	"io/ioutil"
 	"testing"
 
 	"k8s.io/kubernetes/pkg/api/unversioned"
@@ -40,7 +41,7 @@ func (d *fakeDecoder) Decode(data []byte, gvk *unversioned.GroupVersionKind, int
 func TestEmptyDecoder(t *testing.T) {
 	buf := bytes.NewBuffer([]byte{})
 	d := &fakeDecoder{}
-	_, _, err := NewDecoder(buf, d).Decode(nil, nil)
+	_, _, err := NewDecoder(ioutil.NopCloser(buf), d).Decode(nil, nil)
 	if err != io.EOF {
 		t.Fatal(err)
 	}

pkg/util/framer/framer.go

@@ -47,7 +47,7 @@ func (w *lengthDelimitedFrameWriter) Write(data []byte) (int, error) {
 }
 
 type lengthDelimitedFrameReader struct {
-	r         io.Reader
+	r         io.ReadCloser
 	remaining int
 }
 
@@ -63,7 +63,7 @@ type lengthDelimitedFrameReader struct {
 //
 // If the buffer passed to Read is not long enough to contain an entire frame, io.ErrShortRead
 // will be returned along with the number of bytes read.
-func NewLengthDelimitedFrameReader(r io.Reader) io.Reader {
+func NewLengthDelimitedFrameReader(r io.ReadCloser) io.ReadCloser {
 	return &lengthDelimitedFrameReader{r: r}
 }
 
@@ -104,7 +104,12 @@ func (r *lengthDelimitedFrameReader) Read(data []byte) (int, error) {
 	return n, nil
 }
 
+func (r *lengthDelimitedFrameReader) Close() error {
+	return r.r.Close()
+}
+
 type jsonFrameReader struct {
+	r         io.ReadCloser
 	decoder   *json.Decoder
 	remaining []byte
 }
@@ -114,8 +119,9 @@ type jsonFrameReader struct {
 //
 // The boundaries between each frame are valid JSON objects. A JSON parsing error will terminate
 // the read.
-func NewJSONFramedReader(r io.Reader) io.Reader {
+func NewJSONFramedReader(r io.ReadCloser) io.ReadCloser {
 	return &jsonFrameReader{
+		r:       r,
 		decoder: json.NewDecoder(r),
 	}
 }
@@ -154,3 +160,7 @@ func (r *jsonFrameReader) Read(data []byte) (int, error) {
 	}
 	return len(m), nil
 }
+
+func (r *jsonFrameReader) Close() error {
+	return r.r.Close()
+}

pkg/util/framer/framer_test.go

@@ -19,6 +19,7 @@ package framer
 import (
 	"bytes"
 	"io"
+	"io/ioutil"
 	"testing"
 )
 
@@ -33,7 +34,7 @@ func TestRead(t *testing.T) {
 		0x08,
 	}
 	b := bytes.NewBuffer(data)
-	r := NewLengthDelimitedFrameReader(b)
+	r := NewLengthDelimitedFrameReader(ioutil.NopCloser(b))
 	buf := make([]byte, 1)
 	if n, err := r.Read(buf); err != io.ErrShortBuffer && n != 1 && bytes.Equal(buf, []byte{0x01}) {
 		t.Fatalf("unexpected: %v %d %v", err, n, buf)
@@ -78,7 +79,7 @@ func TestReadLarge(t *testing.T) {
 		0x08,
 	}
 	b := bytes.NewBuffer(data)
-	r := NewLengthDelimitedFrameReader(b)
+	r := NewLengthDelimitedFrameReader(ioutil.NopCloser(b))
 	buf := make([]byte, 40)
 	if n, err := r.Read(buf); err != nil && n != 4 && bytes.Equal(buf, []byte{0x01, 0x02, 0x03, 0x04}) {
 		t.Fatalf("unexpected: %v %d %v", err, n, buf)
@@ -103,7 +104,7 @@ func TestReadInvalidFrame(t *testing.T) {
 		0x01, 0x02,
 	}
 	b := bytes.NewBuffer(data)
-	r := NewLengthDelimitedFrameReader(b)
+	r := NewLengthDelimitedFrameReader(ioutil.NopCloser(b))
 	buf := make([]byte, 1)
 	if n, err := r.Read(buf); err != io.ErrShortBuffer && n != 1 && bytes.Equal(buf, []byte{0x01}) {
 		t.Fatalf("unexpected: %v %d %v", err, n, buf)
@@ -121,7 +122,7 @@ func TestReadInvalidFrame(t *testing.T) {
 
 func TestJSONFrameReader(t *testing.T) {
 	b := bytes.NewBufferString("{\"test\":true}\n1\n[\"a\"]")
-	r := NewJSONFramedReader(b)
+	r := NewJSONFramedReader(ioutil.NopCloser(b))
 	buf := make([]byte, 20)
 	if n, err := r.Read(buf); err != nil || n != 13 || string(buf[:n]) != `{"test":true}` {
 		t.Fatalf("unexpected: %v %d %q", err, n, buf)
@@ -139,7 +140,7 @@ func TestJSONFrameReader(t *testing.T) {
 
 func TestJSONFrameReaderShortBuffer(t *testing.T) {
 	b := bytes.NewBufferString("{\"test\":true}\n1\n[\"a\"]")
-	r := NewJSONFramedReader(b)
+	r := NewJSONFramedReader(ioutil.NopCloser(b))
 	buf := make([]byte, 0, 3)
 
 	if n, err := r.Read(buf); err != io.ErrShortBuffer || n != 3 || string(buf[:n]) != `{"t` {

pkg/util/yaml/decoder.go

@@ -78,6 +78,7 @@ func (d *YAMLToJSONDecoder) Decode(into interface{}) error {
 // YAMLDecoder reads chunks of objects and returns ErrShortBuffer if
 // the data is not sufficient.
 type YAMLDecoder struct {
+	r         io.ReadCloser
 	scanner   *bufio.Scanner
 	remaining []byte
 }
@@ -87,10 +88,11 @@ type YAMLDecoder struct {
 // the YAML spec) into its own chunk. io.ErrShortBuffer will be
 // returned if the entire buffer could not be read to assist
 // the caller in framing the chunk.
-func NewDocumentDecoder(r io.Reader) io.Reader {
+func NewDocumentDecoder(r io.ReadCloser) io.ReadCloser {
 	scanner := bufio.NewScanner(r)
 	scanner.Split(splitYAMLDocument)
 	return &YAMLDecoder{
+		r:       r,
 		scanner: scanner,
 	}
 }
@@ -127,6 +129,10 @@ func (d *YAMLDecoder) Read(data []byte) (n int, err error) {
 	return len(data), io.ErrShortBuffer
 }
 
+func (d *YAMLDecoder) Close() error {
+	return d.r.Close()
+}
+
 const yamlSeparator = "\n---"
 
 // splitYAMLDocument is a bufio.SplitFunc for splitting YAML streams into individual documents.