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