watchtower/wtwire: add DeleteSession and DeleteSessionReply message

watchtower/wtwire/delete_session_reply.go

@@ -0,0 +1,66 @@
+package wtwire
+
+import "io"
+
+// DeleteSessionCode is an error code returned by a watchtower in response to a
+// DeleteSession message.
+type DeleteSessionCode = ErrorCode
+
+const (
+	// DeleteSessionCodeNotFound is returned when the watchtower does not
+	// know of the requested session. This may indicate an error on the
+	// client side, or that the tower had already deleted the session in a
+	// prior request that the client may not have received.
+	DeleteSessionCodeNotFound DeleteSessionCode = 80
+
+	// TODO(conner): add String method after wtclient is merged
+)
+
+// DeleteSessionReply is a message sent in response to a client's DeleteSession
+// request. The message indicates whether or not the deletion was a success or
+// failure.
+type DeleteSessionReply struct {
+	// Code will be non-zero if the watchtower was not able to delete the
+	// requested session.
+	Code DeleteSessionCode
+}
+
+// A compile time check to ensure DeleteSessionReply implements the
+// wtwire.Message interface.
+var _ Message = (*DeleteSessionReply)(nil)
+
+// Decode deserializes a serialized DeleteSessionReply message stored in the
+// passed io.Reader observing the specified protocol version.
+//
+// This is part of the wtwire.Message interface.
+func (m *DeleteSessionReply) Decode(r io.Reader, pver uint32) error {
+	return ReadElements(r,
+		&m.Code,
+	)
+}
+
+// Encode serializes the target DeleteSessionReply into the passed io.Writer
+// observing the protocol version specified.
+//
+// This is part of the wtwire.Message interface.
+func (m *DeleteSessionReply) Encode(w io.Writer, pver uint32) error {
+	return WriteElements(w,
+		m.Code,
+	)
+}
+
+// MsgType returns the integer uniquely identifying this message type on the
+// wire.
+//
+// This is part of the wtwire.Message interface.
+func (m *DeleteSessionReply) MsgType() MessageType {
+	return MsgDeleteSessionReply
+}
+
+// MaxPayloadLength returns the maximum allowed payload size for a
+// DeleteSessionReply complete message observing the specified protocol version.
+//
+// This is part of the wtwire.Message interface.
+func (m *DeleteSessionReply) MaxPayloadLength(uint32) uint32 {
+	return 2
+}