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86 lines
2.6 KiB
86 lines
2.6 KiB
package netann |
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import ( |
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"bytes" |
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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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err := chanAnn.Features.Decode(bytes.NewReader(chanInfo.Features)) |
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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.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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