Initial checkin of gRPC to third_party/

third_party/grpc/tools/http2_interop/ping.go

+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
+}