watchtower/wtwire: add DeleteSession and DeleteSessionReply message

watchtower/wtwire/delete_session.go

@@ -0,0 +1,45 @@
+package wtwire
+
+import "io"
+
+// DeleteSession is sent from the client to the tower to signal that the tower
+// can delete all session state for the session key used to authenticate the
+// brontide connection. This should be done by the client once all channels that
+// have state updates in the session have been resolved on-chain.
+type DeleteSession struct{}
+
+// Compile-time constraint to ensure DeleteSession implements the wtwire.Message
+// interface.
+var _ Message = (*DeleteSession)(nil)
+
+// Decode deserializes a serialized DeleteSession message stored in the passed
+// io.Reader observing the specified protocol version.
+//
+// This is part of the wtwire.Message interface.
+func (m *DeleteSession) Decode(r io.Reader, pver uint32) error {
+	return nil
+}
+
+// Encode serializes the target DeleteSession message into the passed io.Writer
+// observing the specified protocol version.
+//
+// This is part of the wtwire.Message interface.
+func (m *DeleteSession) Encode(w io.Writer, pver uint32) error {
+	return nil
+}
+
+// MsgType returns the integer uniquely identifying this message type on the
+// wire.
+//
+// This is part of the wtwire.Message interface.
+func (m *DeleteSession) MsgType() MessageType {
+	return MsgDeleteSession
+}
+
+// MaxPayloadLength returns the maximum allowed payload size for a DeleteSession
+// message observing the specified protocol version.
+//
+// This is part of the wtwire.Message interface.
+func (m *DeleteSession) MaxPayloadLength(uint32) uint32 {
+	return 0
+}