lnwire: add new GossipTimestampRange gossip query msg

lnwire/gossip_timestamp_range.go

@@ -0,0 +1,80 @@
+package lnwire
+
+import (
+	"io"
+
+	"github.com/roasbeef/btcd/chaincfg/chainhash"
+)
+
+// GossipTimestampRange is a message that allows the sender to restrict the set
+// of future gossip announcements sent by the receiver. Nodes should send this
+// if they have the gossip-queries feature bit active. Nodes are able to send
+// new GossipTimestampRange messages to replace the prior window.
+type GossipTimestampRange struct {
+	// ChainHash denotes the chain that the sender wishes to restrict the
+	// set of received announcements of.
+	ChainHash chainhash.Hash
+
+	// FirstTimestamp is the timestamp of the earliest announcement message
+	// that should be sent by the receiver.
+	FirstTimestamp uint32
+
+	// TimestampRange is the horizon beyond the FirstTimestamp that any
+	// announcement messages should be sent for. The receiving node MUST
+	// NOT send any announcements that have a timestamp greater than
+	// FirstTimestamp + TimestampRange.
+	TimestampRange uint32
+}
+
+// NewGossipTimestampRange creates a new empty GossipTimestampRange message.
+func NewGossipTimestampRange() *GossipTimestampRange {
+	return &GossipTimestampRange{}
+}
+
+// A compile time check to ensure GossipTimestampRange implements the
+// lnwire.Message interface.
+var _ Message = (*GossipTimestampRange)(nil)
+
+// Decode deserializes a serialized GossipTimestampRange message stored in the
+// passed io.Reader observing the specified protocol version.
+//
+// This is part of the lnwire.Message interface.
+func (g *GossipTimestampRange) Decode(r io.Reader, pver uint32) error {
+	return readElements(r,
+		g.ChainHash[:],
+		&g.FirstTimestamp,
+		&g.TimestampRange,
+	)
+}
+
+// Encode serializes the target GossipTimestampRange into the passed io.Writer
+// observing the protocol version specified.
+//
+// This is part of the lnwire.Message interface.
+func (g *GossipTimestampRange) Encode(w io.Writer, pver uint32) error {
+	return writeElements(w,
+		g.ChainHash[:],
+		g.FirstTimestamp,
+		g.TimestampRange,
+	)
+}
+
+// MsgType returns the integer uniquely identifying this message type on the
+// wire.
+//
+// This is part of the lnwire.Message interface.
+func (g *GossipTimestampRange) MsgType() MessageType {
+	return MsgGossipTimestampRange
+}
+
+// MaxPayloadLength returns the maximum allowed payload size for a
+// GossipTimestampRange complete message observing the specified protocol
+// version.
+//
+// This is part of the lnwire.Message interface.
+func (c *GossipTimestampRange) MaxPayloadLength(uint32) uint32 {
+	// 32 + 4 + 4
+	//
+	// TODO(roasbeef): update to 8 byte timestmaps?
+	return 40
+}