lnd.xprv/lnwire/gossip_timestamp_range.go
2018-08-02 18:20:50 -07:00

81 lines
2.5 KiB
Go

package lnwire
import (
"io"
"github.com/btcsuite/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 (g *GossipTimestampRange) MaxPayloadLength(uint32) uint32 {
// 32 + 4 + 4
//
// TODO(roasbeef): update to 8 byte timestmaps?
return 40
}