Initial checkin of gRPC to third_party/

third_party/grpc/tools/http2_interop/goaway.go

+package http2interop
+
+import (
+        "encoding/binary"
+        "fmt"
+        "io"
+)
+
+type GoAwayFrame struct {
+        Header FrameHeader
+        Reserved
+        StreamID
+        // TODO(carl-mastrangelo): make an enum out of this.
+        Code uint32
+        Data []byte
+}
+
+func (f *GoAwayFrame) GetHeader() *FrameHeader {
+        return &f.Header
+}
+
+func (f *GoAwayFrame) 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 *GoAwayFrame) 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 = GoAwayFrame{
+                Reserved: Reserved(raw[0]>>7 == 1),
+                StreamID: StreamID(binary.BigEndian.Uint32(raw[0:4]) & 0x7fffffff),
+                Code:     binary.BigEndian.Uint32(raw[4:8]),
+                Data:     []byte(string(raw[8:])),
+        }
+
+        return nil
+}
+
+func (f *GoAwayFrame) MarshalPayload() ([]byte, error) {
+        raw := make([]byte, 8, 8+len(f.Data))
+        binary.BigEndian.PutUint32(raw[:4], uint32(f.StreamID))
+        binary.BigEndian.PutUint32(raw[4:8], f.Code)
+        raw = append(raw, f.Data...)
+
+        return raw, nil
+}
+
+func (f *GoAwayFrame) MarshalBinary() ([]byte, error) {
+        payload, err := f.MarshalPayload()
+        if err != nil {
+                return nil, err
+        }
+
+        f.Header.Length = len(payload)
+        f.Header.Type = GoAwayFrameType
+        header, err := f.Header.MarshalBinary()
+        if err != nil {
+                return nil, err
+        }
+
+        header = append(header, payload...)
+
+        return header, nil
+}