Initial checkin of gRPC to third_party/

third_party/grpc/tools/http2_interop/ping.go

Index: third_party/grpc/tools/http2_interop/ping.go
diff --git a/third_party/grpc/tools/http2_interop/ping.go b/third_party/grpc/tools/http2_interop/ping.go
new file mode 100644
index 0000000000000000000000000000000000000000..6011eed4511c4a9f46ed77c8d55b3aa8be935b99
--- /dev/null
+++ b/third_party/grpc/tools/http2_interop/ping.go
@@ -0,0 +1,65 @@
+package http2interop
+
+import (
+	"fmt"
+	"io"
+)
+
+type PingFrame struct {
+	Header FrameHeader
+	Data   []byte
+}
+
+const (
+	PING_ACK = 0x01
+)
+
+func (f *PingFrame) GetHeader() *FrameHeader {
+	return &f.Header
+}
+
+func (f *PingFrame) ParsePayload(r io.Reader) error {
+	raw := make([]byte, f.Header.Length)
+	if _, err := io.ReadFull(r, raw); err != nil {
+		return err
+	}
+	return f.UnmarshalPayload(raw)
+}
+
+func (f *PingFrame) UnmarshalPayload(raw []byte) error {
+	if f.Header.Length != len(raw) {
+		return fmt.Errorf("Invalid Payload length %d != %d", f.Header.Length, len(raw))
+	}
+	if f.Header.Length != 8 {
+		return fmt.Errorf("Invalid Payload length %d", f.Header.Length)
+	}
+
+	f.Data = []byte(string(raw))
+
+	return nil
+}
+
+func (f *PingFrame) MarshalPayload() ([]byte, error) {
+	if len(f.Data) != 8 {
+		return nil, fmt.Errorf("Invalid Payload length %d", len(f.Data))
+	}
+	return []byte(string(f.Data)), nil
+}
+
+func (f *PingFrame) MarshalBinary() ([]byte, error) {
+	payload, err := f.MarshalPayload()
+	if err != nil {
+		return nil, err
+	}
+
+	f.Header.Length = len(payload)
+	f.Header.Type = PingFrameType
+	header, err := f.Header.MarshalBinary()
+	if err != nil {
+		return nil, err
+	}
+
+	header = append(header, payload...)
+
+	return header, nil
+}