package netann import ( "github.com/lightningnetwork/lnd/channeldb" "github.com/lightningnetwork/lnd/lnwire" ) // CreateChanAnnouncement is a helper function which creates all channel // announcements given the necessary channel related database items. This // function is used to transform out database structs into the corresponding wire // structs for announcing new channels to other peers, or simply syncing up a // peer's initial routing table upon connect. func CreateChanAnnouncement(chanProof *channeldb.ChannelAuthProof, chanInfo *channeldb.ChannelEdgeInfo, e1, e2 *channeldb.ChannelEdgePolicy) (*lnwire.ChannelAnnouncement, *lnwire.ChannelUpdate, *lnwire.ChannelUpdate, error) { // First, using the parameters of the channel, along with the channel // authentication chanProof, we'll create re-create the original // authenticated channel announcement. chanID := lnwire.NewShortChanIDFromInt(chanInfo.ChannelID) chanAnn := &lnwire.ChannelAnnouncement{ ShortChannelID: chanID, NodeID1: chanInfo.NodeKey1Bytes, NodeID2: chanInfo.NodeKey2Bytes, ChainHash: chanInfo.ChainHash, BitcoinKey1: chanInfo.BitcoinKey1Bytes, BitcoinKey2: chanInfo.BitcoinKey2Bytes, Features: lnwire.NewRawFeatureVector(), ExtraOpaqueData: chanInfo.ExtraOpaqueData, } var err error chanAnn.BitcoinSig1, err = lnwire.NewSigFromRawSignature( chanProof.BitcoinSig1Bytes, ) if err != nil { return nil, nil, nil, err } chanAnn.BitcoinSig2, err = lnwire.NewSigFromRawSignature( chanProof.BitcoinSig2Bytes, ) if err != nil { return nil, nil, nil, err } chanAnn.NodeSig1, err = lnwire.NewSigFromRawSignature( chanProof.NodeSig1Bytes, ) if err != nil { return nil, nil, nil, err } chanAnn.NodeSig2, err = lnwire.NewSigFromRawSignature( chanProof.NodeSig2Bytes, ) if err != nil { return nil, nil, nil, err } // We'll unconditionally queue the channel's existence chanProof as it // will need to be processed before either of the channel update // networkMsgs. // Since it's up to a node's policy as to whether they advertise the // edge in a direction, we don't create an advertisement if the edge is // nil. var edge1Ann, edge2Ann *lnwire.ChannelUpdate if e1 != nil { edge1Ann, err = ChannelUpdateFromEdge(chanInfo, e1) if err != nil { return nil, nil, nil, err } } if e2 != nil { edge2Ann, err = ChannelUpdateFromEdge(chanInfo, e2) if err != nil { return nil, nil, nil, err } } return chanAnn, edge1Ann, edge2Ann, nil }