lnwire: add new ReplyChannelRange gossip query message

lnwire/reply_channel_range.go

@@ -0,0 +1,84 @@
+package lnwire
+
+import "io"
+
+// ReplyChannelRange is the response to the QueryChannelRange message. It
+// includes the original query, and the next streaming chunk of encoded short
+// channel ID's as the response. We'll also include a byte that indicates if
+// this is the last query in the message.
+type ReplyChannelRange struct {
+	// QueryChannelRange is the corresponding query to this response.
+	QueryChannelRange
+
+	// Complete denotes if this is the conclusion of the set of streaming
+	// responses to the original query.
+	Complete uint8
+
+	// EncodingType is a signal to the receiver of the message that
+	// indicates exactly how the set of short channel ID's that follow have
+	// been encoded.
+	EncodingType ShortChanIDEncoding
+
+	// ShortChanIDs is a slice of decoded short channel ID's.
+	ShortChanIDs []ShortChannelID
+}
+
+// NewReplyChannelRange creates a new empty ReplyChannelRange message.
+func NewReplyChannelRange() *ReplyChannelRange {
+	return &ReplyChannelRange{}
+}
+
+// A compile time check to ensure ReplyChannelRange implements the
+// lnwire.Message interface.
+var _ Message = (*ReplyChannelRange)(nil)
+
+// Decode deserializes a serialized ReplyChannelRange message stored in the
+// passed io.Reader observing the specified protocol version.
+//
+// This is part of the lnwire.Message interface.
+func (c *ReplyChannelRange) Decode(r io.Reader, pver uint32) error {
+	err := c.QueryChannelRange.Decode(r, pver)
+	if err != nil {
+		return err
+	}
+
+	if err := readElements(r, &c.Complete); err != nil {
+		return err
+	}
+
+	c.EncodingType, c.ShortChanIDs, err = decodeShortChanIDs(r)
+
+	return err
+}
+
+// Encode serializes the target ReplyChannelRange into the passed io.Writer
+// observing the protocol version specified.
+//
+// This is part of the lnwire.Message interface.
+func (c *ReplyChannelRange) Encode(w io.Writer, pver uint32) error {
+	if err := c.QueryChannelRange.Encode(w, pver); err != nil {
+		return err
+	}
+
+	if err := writeElements(w, c.Complete); err != nil {
+		return err
+	}
+
+	return encodeShortChanIDs(w, c.EncodingType, c.ShortChanIDs)
+}
+
+// MsgType returns the integer uniquely identifying this message type on the
+// wire.
+//
+// This is part of the lnwire.Message interface.
+func (c *ReplyChannelRange) MsgType() MessageType {
+	return MsgReplyChannelRange
+}
+
+// MaxPayloadLength returns the maximum allowed payload size for a
+// ReplyChannelRange complete message observing the specified protocol version.
+//
+// This is part of the lnwire.Message interface.
+func (c *ReplyChannelRange) MaxPayloadLength(uint32) uint32 {
+	return MaxMessagePayload
+}