Merge pull request kubernetes#129792 from likakuli/fix-errshortbuffer

fix: Fix the issue of relist caused by client-side timeout

Author: k8s-ci-robot

staging/src/k8s.io/apimachinery/pkg/util/framer/framer.go

@@ -91,12 +91,12 @@ func (r *lengthDelimitedFrameReader) Read(data []byte) (int, error) {
 	}
 	n, err := io.ReadAtLeast(r.r, data[:max], int(max))
 	r.remaining -= n
-	if err == io.ErrShortBuffer || r.remaining > 0 {
-		return n, io.ErrShortBuffer
-	}
 	if err != nil {
 		return n, err
 	}
+	if r.remaining > 0 {
+		return n, io.ErrShortBuffer
+	}
 	if n != expect {
 		return n, io.ErrUnexpectedEOF
 	}

staging/src/k8s.io/apimachinery/pkg/util/framer/framer_test.go

@@ -20,7 +20,12 @@ import (
 	"bytes"
 	"errors"
 	"io"
+	"net/http"
+	"net/http/httptest"
 	"testing"
+	"time"
+
+	netutil "k8s.io/apimachinery/pkg/util/net"
 )
 
 func TestRead(t *testing.T) {
@@ -98,6 +103,7 @@ func TestReadLarge(t *testing.T) {
 		t.Fatalf("unexpected: %v %d", err, n)
 	}
 }
+
 func TestReadInvalidFrame(t *testing.T) {
 	data := []byte{
 		0x00, 0x00, 0x00, 0x04,
@@ -120,6 +126,46 @@ func TestReadInvalidFrame(t *testing.T) {
 	}
 }
 
+func TestReadClientTimeout(t *testing.T) {
+	header := []byte{
+		0x00, 0x00, 0x00, 0x04,
+	}
+	data := []byte{
+		0x01, 0x02, 0x03, 0x04,
+		0x00, 0x00, 0x00, 0x03,
+		0x05, 0x06, 0x07,
+		0x00, 0x00, 0x00, 0x00,
+		0x00, 0x00, 0x00, 0x01,
+		0x08,
+	}
+
+	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		w.WriteHeader(http.StatusOK)
+		_, _ = w.Write(header)
+		if flusher, ok := w.(http.Flusher); ok {
+			flusher.Flush()
+		}
+		time.Sleep(1 * time.Second)
+		_, _ = w.Write(data)
+	}))
+	defer server.Close()
+
+	client := &http.Client{
+		Timeout: 500 * time.Millisecond,
+	}
+
+	resp, err := client.Get(server.URL)
+	if err != nil {
+		t.Fatalf("unexpected: %v", err)
+	}
+
+	r := NewLengthDelimitedFrameReader(resp.Body)
+	buf := make([]byte, 1)
+	if n, err := r.Read(buf); err == nil || !netutil.IsTimeout(err) {
+		t.Fatalf("unexpected: %v %d", err, n)
+	}
+}
+
 func TestJSONFrameReader(t *testing.T) {
 	b := bytes.NewBufferString("{\"test\":true}\n1\n[\"a\"]")
 	r := NewJSONFramedReader(io.NopCloser(b))