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recommend.go
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recommend.go
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// Copyright 2019 Bonsai Software, Inc. All Rights Reserved.
package main
import (
"fmt"
"sort"
"time"
"github.com/lightningnetwork/lnd/lnrpc"
)
type NodeBalance struct {
LocalBalance int64
RemoteBalance int64
}
type PotentialLoop struct {
SrcChan uint64
SrcNode string
DstChan uint64
DstNode string
Amount int64
}
func NewPotentialLoop(
srcChan uint64,
srcNode string,
dstChan uint64,
dstNode string,
amount int64,
) *PotentialLoop {
return &PotentialLoop{
SrcChan: srcChan,
SrcNode: srcNode,
DstChan: dstChan,
DstNode: dstNode,
Amount: amount,
}
}
func recommend(doit bool) bool {
var blacklist = map[string]bool{}
for _, node := range gCfg.Recommend.PeerNodeBlacklist {
blacklist[node] = true
}
var srclist = map[uint64]bool{}
for _, node := range gCfg.Recommend.SrcChanTarget {
srclist[node] = true
}
var dstlist = map[uint64]bool{}
for _, node := range gCfg.Recommend.DstChanTarget {
dstlist[node] = true
}
rsp, err := gClient.ListChannels(gCtx, &lnrpc.ListChannelsRequest{
ActiveOnly: true,
InactiveOnly: false,
PublicOnly: true,
PrivateOnly: false,
})
if err != nil {
panic(fmt.Sprint("ListChannels failed:", err))
}
// Aggregate local and remote balances per node (matters when
// there are multiple channels to the same node.
//
nodeBalances := map[string]*NodeBalance{}
for _, nodeChan := range rsp.Channels {
nb := nodeBalances[nodeChan.RemotePubkey]
if nb == nil {
nb = &NodeBalance{0, 0}
nodeBalances[nodeChan.RemotePubkey] = nb
}
nb.LocalBalance += nodeChan.LocalBalance
nb.RemoteBalance += nodeChan.RemoteBalance
}
// Consider all combinations of channels
loops := []*PotentialLoop{}
for srcNdx, srcChan := range rsp.Channels {
// Is this node blacklisted?
if blacklist[srcChan.RemotePubkey] {
continue
}
// Is there a source list? Is this channel in it?
if len(srclist) > 0 && !srclist[srcChan.ChanId] {
continue
}
for dstNdx, dstChan := range rsp.Channels {
// Is this node blacklisted?
if blacklist[dstChan.RemotePubkey] {
continue
}
// Is there a dest list? Is this channel in it?
if len(dstlist) > 0 && !dstlist[dstChan.ChanId] {
continue
}
// Same channel can't be both src and dst:
if srcNdx == dstNdx {
continue
}
// Make sure the connected nodes are unique:
if srcChan.RemotePubkey == dstChan.RemotePubkey {
continue
}
// Make sure the aggregate source node imbalance is positive:
aggSrcImbalance :=
nodeBalances[srcChan.RemotePubkey].LocalBalance -
((nodeBalances[srcChan.RemotePubkey].LocalBalance +
nodeBalances[srcChan.RemotePubkey].RemoteBalance) / 2)
if aggSrcImbalance < gCfg.Recommend.MinImbalance {
continue
}
// Make sure the aggregate dest node imbalance is negative:
aggDstImbalance :=
nodeBalances[dstChan.RemotePubkey].LocalBalance -
((nodeBalances[dstChan.RemotePubkey].LocalBalance +
nodeBalances[dstChan.RemotePubkey].RemoteBalance) / 2)
if aggDstImbalance > -gCfg.Recommend.MinImbalance {
continue
}
// Make sure the specific source imbalance is positive:
srcImbalance :=
srcChan.LocalBalance -
((srcChan.LocalBalance + srcChan.RemoteBalance) / 2)
if srcImbalance < gCfg.Recommend.MinImbalance {
continue
}
// Make sure the specific destination imbalance is negative:
dstImbalance :=
dstChan.LocalBalance -
((dstChan.LocalBalance + dstChan.RemoteBalance) / 2)
if dstImbalance > -gCfg.Recommend.MinImbalance {
continue
}
// What is the target amount to be moved?
amount := int64(0)
if aggSrcImbalance < -aggDstImbalance {
amount = aggSrcImbalance
} else {
amount = -aggDstImbalance
}
loops = append(loops, NewPotentialLoop(
srcChan.ChanId, srcChan.RemotePubkey,
dstChan.ChanId, dstChan.RemotePubkey,
amount,
))
}
}
sort.SliceStable(loops, func(ii, jj int) bool {
// Amount descending
return loops[ii].Amount > loops[jj].Amount
})
for _, loop := range loops {
// Limit the rebalance amount
amount := loop.Amount
if amount > gCfg.Recommend.TransferAmount {
amount = gCfg.Recommend.TransferAmount
}
// Consider recent history
tstamp := time.Now().Unix() - int64(gCfg.Recommend.RetryInhibit.Seconds())
if !recentlyFailed(loop.SrcChan, loop.DstChan, tstamp, amount, gCfg.Rebalance.FeeLimitRate) {
if doit {
doRebalance(amount, loop.SrcChan, loop.DstChan)
return true
} else {
fmt.Printf("lndtool rebalance -a %d -s %d -d %d\n",
amount, loop.SrcChan, loop.DstChan)
return true
}
}
}
fmt.Println("no loops recommended")
return false
}