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Introducing Rapid Rebalancing

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pull/18/head
ziggie 2 years ago
parent f15046dd19
commit d27f007d7b
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4 changed files with 232 additions and 69 deletions
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64
README.md
Unescape Escape View File

@ -21,8 +21,10 @@ rebalance-lnd](https://github.com/accumulator/rebalance-lnd).
- retry indefinitely until it succeeds or 6 hours pass (currently hardcoded)
- payments time out after 5 minutes (currently hardcoded) so if something's
stuck the process will continue shortly
- JSON config file to set some defaults you prefer
- JSON/TOML config file to set some defaults you prefer
- optional route probing using binary search to rebalance a smaller amount
- optional rapid rebalancing using the same route for further rebalances
unitl route is depleted in case a rebalance succeeds
- data caching to speed up alias resolution, quickly skip failing channel pairs
etc.
- storing/loading cached nodes information to disk to "warm up" much faster next
@ -58,35 +60,37 @@ in `~/go/bin/linux_arm`.
# Parameters
```
-f, --config= config file path
-c, --connect= connect to lnd using host:port
-t, --tlscert= path to tls.cert to connect
--macaroon-dir= path to the macaroon directory
--macaroon-filename= macaroon filename
-n, --network= bitcoin network to use
--pfrom= channels with less than this inbound liquidity percentage will be considered as source channels
--pto= channels with less than this outbound liquidity percentage will be considered as target channels
-p, --perc= use this value as both pfrom and pto from above
-a, --amount= amount to rebalance
--rel-amount-to= calculate amount as the target channel capacity fraction (for example, 0.2 means you want to achieve at most 20% target channel local balance)
--rel-amount-from= calculate amount as the source channel capacity fraction (for example, 0.2 means you want to achieve at most 20% source channel remote balance)
-r, --econ-ratio= economical ratio for fee limit calculation as a multiple of target channel fee (for example, 0.5 means you want to pay at max half the fee you might earn for routing out of the target channel)
--econ-ratio-max-ppm= limits the max fee ppm for a rebalance when using econ ratio
-F, --fee-limit-ppm= don't consider the target channel fee and use this max fee ppm instead (can rebalance at a loss, be careful)
-l, --lost-profit also consider the outbound channel fees when looking for profitable routes so that outbound_fee+inbound_fee < route_fee
-b, --probe-steps= if the payment fails at the last hop try to probe lower amount using this many steps
--min-amount= if probing is enabled this will be the minimum amount to try
-i, --exclude-channel-in= don't use this channel as incoming (can be specified multiple times)
-o, --exclude-channel-out= don't use this channel as outgoing (can be specified multiple times)
-e, --exclude-channel= don't use this channel at all (can be specified multiple times)
-d, --exclude-node= don't use this node for routing (can be specified multiple times)
--to= try only this channel as target (should satisfy other constraints too; can be specified multiple times)
--from= try only this channel as source (should satisfy other constraints too; can be specified multiple times)
--allow-unbalance-from let the source channel go below 50% local liquidity, use if you want to drain a channel; you should also set --pfrom to >50
--allow-unbalance-to let the target channel go above 50% local liquidity, use if you want to refill a channel; you should also set --pto to >50
-s, --stat= save successful rebalance information to the specified CSV file
--node-cache-filename= save and load other nodes information to this file, improves cold start performance
--node-cache-lifetime= nodes with last update older than this time (in minutes) will be removed from cache after loading it (default: 1440)
-f, --config= config file path
-c, --connect= connect to lnd using host:port
-t, --tlscert= path to tls.cert to connect
--macaroon-dir= path to the macaroon directory
--macaroon-filename= macaroon filename
-n, --network= bitcoin network to use
--pfrom= channels with less than this inbound liquidity percentage will be considered as source channels
--pto= channels with less than this outbound liquidity percentage will be considered as target channels
-p, --perc= use this value as both pfrom and pto from above
-a, --amount= amount to rebalance
--rel-amount-to= calculate amount as the target channel capacity fraction (for example, 0.2 means you want to achieve at most 20% target channel local balance)
--rel-amount-from= calculate amount as the source channel capacity fraction (for example, 0.2 means you want to achieve at most 20% source channel remote balance)
-r, --econ-ratio= economical ratio for fee limit calculation as a multiple of target channel fee (for example, 0.5 means you want to pay at max half the fee you
might earn for routing out of the target channel)
--econ-ratio-max-ppm= limits the max fee ppm for a rebalance when using econ ratio
-F, --fee-limit-ppm= don't consider the target channel fee and use this max fee ppm instead (can rebalance at a loss, be careful)
-l, --lost-profit also consider the outbound channel fees when looking for profitable routes so that outbound_fee+inbound_fee < route_fee
-b, --probe-steps= if the payment fails at the last hop try to probe lower amount using this many steps
--allow-rapid-rebalancing if a rebalance succeeds the route will be used for further rebalances until criteria for channels is not satifsied
--min-amount= if probing is enabled this will be the minimum amount to try
-i, --exclude-channel-in= don't use this channel as incoming (can be specified multiple times)
-o, --exclude-channel-out= don't use this channel as outgoing (can be specified multiple times)
-e, --exclude-channel= don't use this channel at all (can be specified multiple times)
-d, --exclude-node= don't use this node for routing (can be specified multiple times)
--to= try only this channel as target (should satisfy other constraints too; can be specified multiple times)
--from= try only this channel as source (should satisfy other constraints too; can be specified multiple times)
--allow-unbalance-from let the source channel go below 50% local liquidity, use if you want to drain a channel; you should also set --pfrom to >50
--allow-unbalance-to let the target channel go above 50% local liquidity, use if you want to refill a channel; you should also set --pto to >50
-s, --stat= save successful rebalance information to the specified CSV file
--node-cache-filename= save and load other nodes information to this file, improves cold start performance
--node-cache-lifetime= nodes with last update older than this time (in minutes) will be removed from cache after loading it (default: 1440)
```
Look in `config.json.sample` or `config.toml.sample` for corresponding keys,

7
channels.go
Unescape Escape View File

@ -39,6 +39,7 @@ func makeChanSet(chanIds []uint64) (result map[uint64]struct{}) {
}
func (r *regolancer) getChannelCandidates(fromPerc, toPerc, amount int64) error {
for _, c := range r.channels {
if _, ok := r.excludeBoth[c.ChanId]; ok {
continue
@ -87,7 +88,7 @@ func min(args ...int64) (result int64) {
func (r *regolancer) pickChannelPair(amount, minAmount int64,
relFromAmount, relToAmount float64) (from uint64, to uint64, maxAmount int64, err error) {
if len(r.channelPairs) == 0 {
if !r.routeFound {
if !r.routeFound || len(r.failureCache) == 0 {
return 0, 0, 0, errors.New("no routes")
}
log.Print(errColor("No channel pairs left, expiring all failed routes"))
@ -96,10 +97,14 @@ func (r *regolancer) pickChannelPair(amount, minAmount int64,
r.channelPairs[k] = v.channelPair
delete(r.failureCache, k)
}
r.routeFound = false
}
var fromChan, toChan *lnrpc.Channel
idx := rand.Int31n(int32(len(r.channelPairs)))
var pair [2]*lnrpc.Channel
for _, pair = range r.channelPairs {
if idx == 0 {

226
main.go
Unescape Escape View File

@ -2,7 +2,9 @@ package main
import (
"context"
"encoding/hex"
"encoding/json"
"fmt"
"log"
"math/rand"
"os"
@ -19,35 +21,36 @@ import (
)
type configParams struct {
Config string `short:"f" long:"config" description:"config file path"`
Connect string `short:"c" long:"connect" description:"connect to lnd using host:port" json:"connect" toml:"connect"`
TLSCert string `short:"t" long:"tlscert" description:"path to tls.cert to connect" required:"false" json:"tlscert" toml:"tlscert"`
MacaroonDir string `long:"macaroon-dir" description:"path to the macaroon directory" required:"false" json:"macaroon_dir" toml:"macaroon_dir"`
MacaroonFilename string `long:"macaroon-filename" description:"macaroon filename" json:"macaroon_filename" toml:"macaroon_filename"`
Network string `short:"n" long:"network" description:"bitcoin network to use" json:"network" toml:"network"`
FromPerc int64 `long:"pfrom" description:"channels with less than this inbound liquidity percentage will be considered as source channels" json:"pfrom" toml:"pfrom"`
ToPerc int64 `long:"pto" description:"channels with less than this outbound liquidity percentage will be considered as target channels" json:"pto" toml:"pto"`
Perc int64 `short:"p" long:"perc" description:"use this value as both pfrom and pto from above" json:"perc" toml:"perc"`
Amount int64 `short:"a" long:"amount" description:"amount to rebalance" json:"amount" toml:"amount"`
RelAmountTo float64 `long:"rel-amount-to" description:"calculate amount as the target channel capacity fraction (for example, 0.2 means you want to achieve at most 20% target channel local balance)"`
RelAmountFrom float64 `long:"rel-amount-from" description:"calculate amount as the source channel capacity fraction (for example, 0.2 means you want to achieve at most 20% source channel remote balance)"`
EconRatio float64 `short:"r" long:"econ-ratio" description:"economical ratio for fee limit calculation as a multiple of target channel fee (for example, 0.5 means you want to pay at max half the fee you might earn for routing out of the target channel)" json:"econ_ratio" toml:"econ_ratio"`
EconRatioMaxPPM int64 `long:"econ-ratio-max-ppm" description:"limits the max fee ppm for a rebalance when using econ ratio" json:"econ_ratio_max_ppm" toml:"econ_ratio_max_ppm"`
FeeLimitPPM int64 `short:"F" long:"fee-limit-ppm" description:"don't consider the target channel fee and use this max fee ppm instead (can rebalance at a loss, be careful)" json:"fee_limit_ppm" toml:"fee_limit_ppm"`
LostProfit bool `short:"l" long:"lost-profit" description:"also consider the outbound channel fees when looking for profitable routes so that outbound_fee+inbound_fee < route_fee" json:"lost_profit" toml:"lost_profit"`
ProbeSteps int `short:"b" long:"probe-steps" description:"if the payment fails at the last hop try to probe lower amount using this many steps" json:"probe_steps" toml:"probe_steps"`
MinAmount int64 `long:"min-amount" description:"if probing is enabled this will be the minimum amount to try" json:"min_amount" toml:"min_amount"`
ExcludeChannelsIn []string `short:"i" long:"exclude-channel-in" description:"don't use this channel as incoming (can be specified multiple times)" json:"exclude_channels_in" toml:"exclude_channels_in"`
ExcludeChannelsOut []string `short:"o" long:"exclude-channel-out" description:"don't use this channel as outgoing (can be specified multiple times)" json:"exclude_channels_out" toml:"exclude_channels_out"`
ExcludeChannels []string `short:"e" long:"exclude-channel" description:"don't use this channel at all (can be specified multiple times)" json:"exclude_channels" toml:"exclude_channels"`
ExcludeNodes []string `short:"d" long:"exclude-node" description:"don't use this node for routing (can be specified multiple times)" json:"exclude_nodes" toml:"exclude_nodes"`
ToChannel []string `long:"to" description:"try only this channel as target (should satisfy other constraints too; can be specified multiple times)" json:"to" toml:"to"`
FromChannel []string `long:"from" description:"try only this channel as source (should satisfy other constraints too; can be specified multiple times)" json:"from" toml:"from"`
AllowUnbalanceFrom bool `long:"allow-unbalance-from" description:"let the source channel go below 50% local liquidity, use if you want to drain a channel; you should also set --pfrom to >50" json:"allow_unbalance_from" toml:"allow_unbalance_from"`
AllowUnbalanceTo bool `long:"allow-unbalance-to" description:"let the target channel go above 50% local liquidity, use if you want to refill a channel; you should also set --pto to >50" json:"allow_unbalance_to" toml:"allow_unbalance_to"`
StatFilename string `short:"s" long:"stat" description:"save successful rebalance information to the specified CSV file" json:"stat" toml:"stat"`
NodeCacheFilename string `long:"node-cache-filename" description:"save and load other nodes information to this file, improves cold start performance" json:"node_cache_filename" toml:"node_cache_filename"`
NodeCacheLifetime int `long:"node-cache-lifetime" description:"nodes with last update older than this time (in minutes) will be removed from cache after loading it" json:"node_cache_lifetime" toml:"node_cache_lifetime" default:"1440"`
Config string `short:"f" long:"config" description:"config file path"`
Connect string `short:"c" long:"connect" description:"connect to lnd using host:port" json:"connect" toml:"connect"`
TLSCert string `short:"t" long:"tlscert" description:"path to tls.cert to connect" required:"false" json:"tlscert" toml:"tlscert"`
MacaroonDir string `long:"macaroon-dir" description:"path to the macaroon directory" required:"false" json:"macaroon_dir" toml:"macaroon_dir"`
MacaroonFilename string `long:"macaroon-filename" description:"macaroon filename" json:"macaroon_filename" toml:"macaroon_filename"`
Network string `short:"n" long:"network" description:"bitcoin network to use" json:"network" toml:"network"`
FromPerc int64 `long:"pfrom" description:"channels with less than this inbound liquidity percentage will be considered as source channels" json:"pfrom" toml:"pfrom"`
ToPerc int64 `long:"pto" description:"channels with less than this outbound liquidity percentage will be considered as target channels" json:"pto" toml:"pto"`
Perc int64 `short:"p" long:"perc" description:"use this value as both pfrom and pto from above" json:"perc" toml:"perc"`
Amount int64 `short:"a" long:"amount" description:"amount to rebalance" json:"amount" toml:"amount"`
RelAmountTo float64 `long:"rel-amount-to" description:"calculate amount as the target channel capacity fraction (for example, 0.2 means you want to achieve at most 20% target channel local balance)"`
RelAmountFrom float64 `long:"rel-amount-from" description:"calculate amount as the source channel capacity fraction (for example, 0.2 means you want to achieve at most 20% source channel remote balance)"`
EconRatio float64 `short:"r" long:"econ-ratio" description:"economical ratio for fee limit calculation as a multiple of target channel fee (for example, 0.5 means you want to pay at max half the fee you might earn for routing out of the target channel)" json:"econ_ratio" toml:"econ_ratio"`
EconRatioMaxPPM int64 `long:"econ-ratio-max-ppm" description:"limits the max fee ppm for a rebalance when using econ ratio" json:"econ_ratio_max_ppm" toml:"econ_ratio_max_ppm"`
FeeLimitPPM int64 `short:"F" long:"fee-limit-ppm" description:"don't consider the target channel fee and use this max fee ppm instead (can rebalance at a loss, be careful)" json:"fee_limit_ppm" toml:"fee_limit_ppm"`
LostProfit bool `short:"l" long:"lost-profit" description:"also consider the outbound channel fees when looking for profitable routes so that outbound_fee+inbound_fee < route_fee" json:"lost_profit" toml:"lost_profit"`
ProbeSteps int `short:"b" long:"probe-steps" description:"if the payment fails at the last hop try to probe lower amount using this many steps" json:"probe_steps" toml:"probe_steps"`
AllowRapidRebalance bool `long:"allow-rapid-rebalancing" description:"if a rebalance succeeds the route will be used for further rebalances until criteria for channels is not satifsied" json:"allow_rapid_rebalance" toml:"allow_rapid_rebalance"`
MinAmount int64 `long:"min-amount" description:"if probing is enabled this will be the minimum amount to try" json:"min_amount" toml:"min_amount"`
ExcludeChannelsIn []string `short:"i" long:"exclude-channel-in" description:"don't use this channel as incoming (can be specified multiple times)" json:"exclude_channels_in" toml:"exclude_channels_in"`
ExcludeChannelsOut []string `short:"o" long:"exclude-channel-out" description:"don't use this channel as outgoing (can be specified multiple times)" json:"exclude_channels_out" toml:"exclude_channels_out"`
ExcludeChannels []string `short:"e" long:"exclude-channel" description:"don't use this channel at all (can be specified multiple times)" json:"exclude_channels" toml:"exclude_channels"`
ExcludeNodes []string `short:"d" long:"exclude-node" description:"don't use this node for routing (can be specified multiple times)" json:"exclude_nodes" toml:"exclude_nodes"`
ToChannel []string `long:"to" description:"try only this channel as target (should satisfy other constraints too; can be specified multiple times)" json:"to" toml:"to"`
FromChannel []string `long:"from" description:"try only this channel as source (should satisfy other constraints too; can be specified multiple times)" json:"from" toml:"from"`
AllowUnbalanceFrom bool `long:"allow-unbalance-from" description:"let the source channel go below 50% local liquidity, use if you want to drain a channel; you should also set --pfrom to >50" json:"allow_unbalance_from" toml:"allow_unbalance_from"`
AllowUnbalanceTo bool `long:"allow-unbalance-to" description:"let the target channel go above 50% local liquidity, use if you want to refill a channel; you should also set --pto to >50" json:"allow_unbalance_to" toml:"allow_unbalance_to"`
StatFilename string `short:"s" long:"stat" description:"save successful rebalance information to the specified CSV file" json:"stat" toml:"stat"`
NodeCacheFilename string `long:"node-cache-filename" description:"save and load other nodes information to this file, improves cold start performance" json:"node_cache_filename" toml:"node_cache_filename"`
NodeCacheLifetime int `long:"node-cache-lifetime" description:"nodes with last update older than this time (in minutes) will be removed from cache after loading it" json:"node_cache_lifetime" toml:"node_cache_lifetime" default:"1440"`
}
var params, cfgParams configParams
@ -168,6 +171,17 @@ func tryRebalance(ctx context.Context, r *regolancer, attempt *int) (err error,
r.printRoute(ctx, route)
err = r.pay(ctx, amt, params.MinAmount, route, params.ProbeSteps)
if err == nil {
if params.AllowRapidRebalance {
_, err := tryRapidRebalance(ctx, r, from, to, route, amt)
if err != nil {
log.Printf("Rapid rebalance failed with %s", err)
} else {
log.Printf("Finished rapid rebalancing")
}
}
return nil, false
}
if retryErr, ok := err.(ErrRetry); ok {
@ -179,6 +193,16 @@ func tryRebalance(ctx context.Context, r *regolancer, attempt *int) (err error,
} else {
err = r.pay(ctx, amt, 0, probedRoute, 0)
if err == nil {
if params.AllowRapidRebalance && params.MinAmount > 0 {
_, err := tryRapidRebalance(ctx, r, from, to, probedRoute, amt)
if err != nil {
log.Printf("Rapid rebalance failed with %s", err)
} else {
log.Printf("Finished rapid rebalancing")
}
}
return nil, false
} else {
r.invalidateInvoice(amt)
@ -191,13 +215,115 @@ func tryRebalance(ctx context.Context, r *regolancer, attempt *int) (err error,
return nil, true
}
func main() {
rand.Seed(time.Now().UnixNano())
loadConfig()
_, err := flags.Parse(&params)
if err != nil {
os.Exit(1)
func tryRapidRebalance(ctx context.Context, r *regolancer, from, to uint64, route *lnrpc.Route, amt int64) (successfullAtempts int, err error) {
rapidAttempt := 0
for {
log.Printf("Rapid rebalance attempt %s", hiWhiteColor(rapidAttempt+1))
cTo, err := r.getChanInfo(ctx, to)
if err != nil {
logErrorF("Error fetching target channel: %s", err)
return rapidAttempt, err
}
cFrom, err := r.getChanInfo(ctx, from)
if err != nil {
logErrorF("Error fetching source channel: %s", err)
return rapidAttempt, err
}
fromPeer, _ := hex.DecodeString(cFrom.Node1Pub)
if cFrom.Node1Pub == r.myPK {
fromPeer, _ = hex.DecodeString(cFrom.Node2Pub)
}
fromChan, err := r.lnClient.ListChannels(ctx, &lnrpc.ListChannelsRequest{ActiveOnly: true, PublicOnly: true, Peer: fromPeer})
if err != nil {
logErrorF("Error fetching source channel: %s", err)
return rapidAttempt, err
}
toPeer, _ := hex.DecodeString(cTo.Node1Pub)
if cTo.Node1Pub == r.myPK {
toPeer, _ = hex.DecodeString(cTo.Node2Pub)
}
toChan, err := r.lnClient.ListChannels(ctx, &lnrpc.ListChannelsRequest{ActiveOnly: true, PublicOnly: true, Peer: toPeer})
if err != nil {
logErrorF("Error fetching target channel: %s", err)
return rapidAttempt, err
}
for k, _ := range r.fromChannelId {
delete(r.fromChannelId, k)
}
r.fromChannelId = makeChanSet([]uint64{from})
for k, _ := range r.toChannelId {
delete(r.toChannelId, k)
}
r.toChannelId = makeChanSet([]uint64{to})
r.channels = r.channels[:0]
r.fromChannels = r.fromChannels[:0]
r.toChannels = r.toChannels[:0]
r.channels = append(r.channels, toChan.Channels...)
r.channels = append(r.channels, fromChan.Channels...)
for k, _ := range r.failureCache {
delete(r.failureCache, k)
}
for k, _ := range r.channelPairs {
delete(r.channelPairs, k)
}
err = r.getChannelCandidates(params.FromPerc, params.ToPerc, amt)
if err != nil {
logErrorF("Error selecting channel candidates: %s", err)
return rapidAttempt, err
}
from, to, amt, err = r.pickChannelPair(amt, params.MinAmount, params.RelAmountFrom, params.RelAmountTo)
if err != nil {
log.Printf(errColor("Error during picking channel: %s"), err)
return rapidAttempt, err
}
log.Printf("rapid fire starting with amount %s", hiWhiteColor(amt))
route, err = r.rebuildRoute(ctx, route, amt)
if err != nil {
log.Printf(errColor("Error building route: %s"), err)
return rapidAttempt, err
}
err = r.pay(ctx, amt, params.MinAmount, route, 0)
if err != nil {
log.Printf("Rebalance failed with %s", err)
break
} else {
rapidAttempt++
}
}
log.Printf("%s rapid rebalances were successful\n", hiWhiteColor(rapidAttempt))
return rapidAttempt, nil
}
func preflightChecks(params configParams) error {
if params.Connect == "" {
params.Connect = "127.0.0.1:10009"
}
@ -217,7 +343,7 @@ func main() {
params.EconRatio = 1
}
if params.EconRatioMaxPPM != 0 && params.FeeLimitPPM != 0 {
log.Fatalf(errColor("Error EconRatioMaxPPM and FeeLimitPPM not allowed at the same time (safety precaution)"))
return fmt.Errorf("use either econ-ratio-max-ppm or fee-limit-ppm but not both")
}
if params.Perc > 0 {
params.FromPerc = params.Perc
@ -225,12 +351,36 @@ func main() {
}
if params.MinAmount > 0 && params.Amount > 0 &&
params.MinAmount > params.Amount {
log.Fatal("Minimum amount should be less than amount")
return fmt.Errorf("minimum amount should be less than amount")
}
if params.Amount > 0 &&
(params.RelAmountFrom > 0 || params.RelAmountTo > 0) {
log.Fatal("Use either precise amount or relative amounts but not both.")
return fmt.Errorf("use either precise amount or relative amounts but not both")
}
if (params.RelAmountFrom > 0 || params.RelAmountTo > 0) && params.AllowRapidRebalance {
return fmt.Errorf("use either relative amounts or rapid rebalance but not both")
}
return nil
}
func main() {
rand.Seed(time.Now().UnixNano())
loadConfig()
_, err := flags.Parse(&params)
if err != nil {
os.Exit(1)
}
err = preflightChecks(params)
if err != nil {
log.Fatal(errColor(err))
}
conn, err := lndclient.NewBasicConn(params.Connect, params.TLSCert, params.MacaroonDir, params.Network,
lndclient.MacFilename(params.MacaroonFilename))
if err != nil {

4
payment.go
Unescape Escape View File

@ -30,6 +30,7 @@ func (r *regolancer) createInvoice(ctx context.Context, amount int64) (result *l
Memo: "Rebalance attempt",
Expiry: int64(time.Hour.Seconds() * 24)})
r.invoiceCache[amount] = result
return
}
@ -56,6 +57,7 @@ func (r *regolancer) pay(ctx context.Context, amount int64, minAmount int64,
PaymentAddr: invoice.PaymentAddr,
TotalAmtMsat: amount * 1000,
}
result, err := r.routerClient.SendToRouteV2(ctx,
&routerrpc.SendToRouteRequest{
PaymentHash: invoice.RHash,
@ -133,6 +135,8 @@ func (r *regolancer) pay(ctx context.Context, amount int64, minAmount int64,
f.Write([]byte(fmt.Sprintf("%d,%d,%d,%d,%d\n", time.Now().Unix(), route.Hops[0].ChanId,
lastHop.ChanId, route.TotalAmtMsat-route.TotalFeesMsat, route.TotalFeesMsat)))
}
// Necessary for Rapid Rebalancing
r.invalidateInvoice(amount)
return nil
}
}

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