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invoicesrpc: pass in specialized config for select hop hints

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This commit is contained in:
carla 2022-01-27 15:09:19 +02:00
parent 56e83de9ef
commit 00a47740c8
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GPG Key ID: 4CA7FE54A6213C91
1 changed files with 30 additions and 7 deletions
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37
lnrpc/invoicesrpc/addinvoice.go
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@ -400,8 +400,11 @@ func AddInvoice(ctx context.Context, cfg *AddInvoiceConfig,
// We'll restrict the number of individual route hints
// to 20 to avoid creating overly large invoices.
numMaxHophints := 20 - len(forcedHints)
hopHintsCfg := newSelectHopHintsCfg(cfg)
hopHints := SelectHopHints(
amtMSat, cfg, filteredChannels, numMaxHophints,
amtMSat, hopHintsCfg, filteredChannels,
numMaxHophints,
)
options = append(options, hopHints...)
@ -476,7 +479,7 @@ func AddInvoice(ctx context.Context, cfg *AddInvoiceConfig,
// chanCanBeHopHint returns true if the target channel is eligible to be a hop
// hint.
func chanCanBeHopHint(channel *HopHintInfo, cfg *AddInvoiceConfig) (
func chanCanBeHopHint(channel *HopHintInfo, cfg *SelectHopHintsCfg) (
*channeldb.ChannelEdgePolicy, bool) {
// Since we're only interested in our private channels, we'll skip
@ -500,7 +503,7 @@ func chanCanBeHopHint(channel *HopHintInfo, cfg *AddInvoiceConfig) (
// channels.
var remotePub [33]byte
copy(remotePub[:], channel.RemotePubkey.SerializeCompressed())
isRemoteNodePublic, err := cfg.Graph.IsPublicNode(remotePub)
isRemoteNodePublic, err := cfg.IsPublicNode(remotePub)
if err != nil {
log.Errorf("Unable to determine if node %x "+
"is advertised: %v", remotePub, err)
@ -515,9 +518,7 @@ func chanCanBeHopHint(channel *HopHintInfo, cfg *AddInvoiceConfig) (
}
// Fetch the policies for each end of the channel.
info, p1, p2, err := cfg.Graph.FetchChannelEdgesByID(
channel.ShortChannelID,
)
info, p1, p2, err := cfg.FetchChannelEdgesByID(channel.ShortChannelID)
if err != nil {
log.Errorf("Unable to fetch the routing "+
"policies for the edges of the channel "+
@ -593,12 +594,34 @@ func newHopHintInfo(c *channeldb.OpenChannel, isActive bool) *HopHintInfo {
}
}
// SelectHopHintsCfg contains the dependencies required to obtain hop hints
// for an invoice.
type SelectHopHintsCfg struct {
// IsPublicNode is returns a bool indicating whether the node with the
// given public key is seen as a public node in the graph from the
// graph's source node's point of view.
IsPublicNode func(pubKey [33]byte) (bool, error)
// FetchChannelEdgesByID attempts to lookup the two directed edges for
// the channel identified by the channel ID.
FetchChannelEdgesByID func(chanID uint64) (*channeldb.ChannelEdgeInfo,
*channeldb.ChannelEdgePolicy, *channeldb.ChannelEdgePolicy,
error)
}
func newSelectHopHintsCfg(invoicesCfg *AddInvoiceConfig) *SelectHopHintsCfg {
return &SelectHopHintsCfg{
IsPublicNode: invoicesCfg.Graph.IsPublicNode,
FetchChannelEdgesByID: invoicesCfg.Graph.FetchChannelEdgesByID,
}
}
// SelectHopHints will select up to numMaxHophints from the set of passed open
// channels. The set of hop hints will be returned as a slice of functional
// options that'll append the route hint to the set of all route hints.
//
// TODO(roasbeef): do proper sub-set sum max hints usually << numChans
func SelectHopHints(amtMSat lnwire.MilliSatoshi, cfg *AddInvoiceConfig,
func SelectHopHints(amtMSat lnwire.MilliSatoshi, cfg *SelectHopHintsCfg,
openChannels []*HopHintInfo,
numMaxHophints int) []func(*zpay32.Invoice) {