Initial checkin of gRPC to third_party/

third_party/grpc/tools/http2_interop/goaway.go

Index: third_party/grpc/tools/http2_interop/goaway.go
diff --git a/third_party/grpc/tools/http2_interop/goaway.go b/third_party/grpc/tools/http2_interop/goaway.go
new file mode 100644
index 0000000000000000000000000000000000000000..289442d615bb3189816b377ef6b49bd92ed0ca18
--- /dev/null
+++ b/third_party/grpc/tools/http2_interop/goaway.go
@@ -0,0 +1,72 @@
+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
+}