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main.go
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package main
import (
"context"
"errors"
"fmt"
"io"
core_log "log"
"net"
"net/http"
"os"
"os/signal"
"path/filepath"
"strconv"
"strings"
"syscall"
"time"
"github.com/elementsproject/peerswap/lnd"
"github.com/elementsproject/peerswap/log"
"github.com/elementsproject/peerswap/version"
"github.com/grpc-ecosystem/grpc-gateway/v2/runtime"
"github.com/btcsuite/btcd/btcutil"
"github.com/btcsuite/btcd/chaincfg"
"github.com/elementsproject/glightning/gbitcoin"
"github.com/elementsproject/glightning/gelements"
"github.com/elementsproject/peerswap/cmd/peerswaplnd"
lnd_internal "github.com/elementsproject/peerswap/lnd"
"github.com/elementsproject/peerswap/messages"
"github.com/elementsproject/peerswap/onchain"
"github.com/elementsproject/peerswap/peerswaprpc"
"github.com/elementsproject/peerswap/policy"
"github.com/elementsproject/peerswap/poll"
"github.com/elementsproject/peerswap/swap"
"github.com/elementsproject/peerswap/txwatcher"
"github.com/elementsproject/peerswap/wallet"
"github.com/jessevdk/go-flags"
"github.com/lightningnetwork/lnd/lnrpc"
"github.com/lightningnetwork/lnd/lnrpc/walletrpc"
"github.com/vulpemventures/go-elements/network"
"go.etcd.io/bbolt"
"google.golang.org/grpc"
"google.golang.org/grpc/credentials/insecure"
"google.golang.org/protobuf/encoding/protojson"
)
const (
minLndVersion = float64(14.1)
)
var GitCommit string
func main() {
err := run()
if err != nil {
core_log.Fatal(err)
}
}
func run() error {
ctx, cancel := context.WithCancel(context.Background())
defer cancel()
shutdown := make(chan struct{})
sigChan := make(chan os.Signal)
signal.Notify(sigChan, syscall.SIGTERM, syscall.SIGINT)
go func() {
defer close(shutdown)
defer close(sigChan)
select {
case sig := <-sigChan:
log.Infof("received signal: %v, release shutdown", sig)
cancel()
shutdown <- struct{}{}
}
}()
// load config
cfg, err := loadConfig()
if e, ok := err.(*flags.Error); ok && e.Type == flags.ErrHelp {
return nil
}
if err != nil {
return err
}
err = cfg.Validate()
if err != nil {
return err
}
logger, closeFunc, err := NewLndLogger(cfg)
if err != nil {
return err
}
defer closeFunc()
log.SetLogger(logger)
// make datadir
err = os.MkdirAll(cfg.DataDir, 0755)
if err != nil {
return err
}
log.Infof("PeerSwap LND starting up with commit %s and cfg: %s", GitCommit, cfg)
// setup lnd connection
cc, err := lnd.GetClientConnection(ctx, cfg.LndConfig)
if err != nil {
return err
}
defer cc.Close()
lnrpcClient := lnrpc.NewLightningClient(cc)
info, err := lnrpcClient.GetInfo(context.Background(), &lnrpc.GetInfoRequest{})
if err != nil {
return err
}
log.Infof("Running with lnd node: %s", info.IdentityPubkey)
err = checkLndVersion(info.Version)
if err != nil {
return err
}
// We want to make sure that lnd is synced and ready to use before we
// continue to start services.
log.Infof("Waiting for lnd to be synced...")
err = waitForLndSynced(lnrpcClient, 10*time.Second)
if err != nil {
return err
}
log.Infof("Lnd synced, continue...")
var supportedAssets = []string{}
var bitcoinOnChainService *onchain.BitcoinOnChain
var lndTxWatcher *lnd_internal.TxWatcher
// setup bitcoin stuff
if cfg.BitcoinEnabled {
// bitcoin
chain, err := getBitcoinChain(ctx, lnrpcClient)
if err != nil {
return err
}
supportedAssets = append(supportedAssets, "btc")
lndTxWatcher, err = lnd_internal.NewTxWatcher(
ctx,
cc,
chain,
onchain.BitcoinMinConfs,
onchain.BitcoinCsv,
)
if err != nil {
return err
}
// Start the LndEstimator.
lndEstimator, err := onchain.NewLndEstimator(
walletrpc.NewWalletKitClient(cc),
btcutil.Amount(253),
10*time.Minute,
)
if err != nil {
return err
}
if err = lndEstimator.Start(); err != nil {
return err
}
// Create the bitcoin onchain service with a fallback fee rate of
// 253 sat/kw.
// TODO: This fee rate does not matter right now but we might want to
// add a config flag to set this higher than the assumed floor fee rate
// of 275 sat/kw (1.1 sat/vb).
bitcoinOnChainService = onchain.NewBitcoinOnChain(
lndEstimator,
btcutil.Amount(253),
chain,
)
log.Infof("Bitcoin swaps enabled on network %s", chain.Name)
} else {
log.Infof("Bitcoin swaps disabled")
}
// setup liquid stuff
var liquidOnChainService *onchain.LiquidOnChain
var liquidTxWatcher *txwatcher.BlockchainRpcTxWatcher
var liquidRpcWallet *wallet.ElementsRpcWallet
var liquidCli *gelements.Elements
if cfg.LiquidEnabled {
supportedAssets = append(supportedAssets, "lbtc")
log.Infof("Liquid swaps enabled")
// blockchaincli
liquidConfig := cfg.ElementsConfig
liquidCli = gelements.NewElements(liquidConfig.RpcUser, liquidConfig.RpcPassword)
err = liquidCli.StartUp(liquidConfig.RpcHost, liquidConfig.RpcPort)
if err != nil {
return err
}
// Wallet
liquidWalletCli := gelements.NewElements(liquidConfig.RpcUser, liquidConfig.RpcPassword)
err = liquidWalletCli.StartUp(liquidConfig.RpcHost, liquidConfig.RpcPort)
if err != nil {
return err
}
liquidRpcWallet, err = wallet.NewRpcWallet(liquidWalletCli, liquidConfig.RpcWallet)
if err != nil {
return err
}
// txwatcher
liquidTxWatcher = txwatcher.NewBlockchainRpcTxWatcher(ctx, txwatcher.NewElementsCli(liquidCli), onchain.LiquidConfs, onchain.LiquidCsv)
// LiquidChain
liquidChain, err := getLiquidChain(liquidCli)
if err != nil {
return err
}
liquidOnChainService = onchain.NewLiquidOnChain(liquidCli, liquidRpcWallet, liquidChain)
} else {
log.Infof("Liquid swaps disabled")
}
if !cfg.BitcoinEnabled && !cfg.LiquidEnabled {
return errors.New("bad config, either liquid or bitcoin settings must be set")
}
// Start lnd listeners and watchers.
messageListener, err := lnd_internal.NewMessageListener(ctx, cc)
if err != nil {
return err
}
defer messageListener.Stop()
paymentWatcher, err := lnd_internal.NewPaymentWatcher(ctx, cc)
if err != nil {
return err
}
defer paymentWatcher.Stop()
peerListener, err := lnd_internal.NewPeerListener(ctx, cc)
if err != nil {
return err
}
defer peerListener.Stop()
// Setup lnd client.
lnd, err := lnd_internal.NewClient(
ctx,
cc,
paymentWatcher,
messageListener,
bitcoinOnChainService,
)
if err != nil {
return err
}
// db
swapDb, err := bbolt.Open(filepath.Join(cfg.DataDir, "swaps"), 0700, nil)
if err != nil {
return err
}
// policy
pol, err := policy.CreateFromFile(cfg.PolicyFile)
if err != nil {
return err
}
// setup swap services
log.Infof("using policy:\n%s", pol)
swapStore, err := swap.NewBboltStore(swapDb)
if err != nil {
return err
}
requestedSwapStore, err := swap.NewRequestedSwapsStore(swapDb)
if err != nil {
return err
}
// Manager for send message retry.
mesmgr := messages.NewManager()
swapServices := swap.NewSwapServices(swapStore,
requestedSwapStore,
lnd,
lnd,
mesmgr,
pol,
cfg.BitcoinEnabled,
lnd,
bitcoinOnChainService,
lndTxWatcher,
cfg.LiquidEnabled,
liquidOnChainService,
liquidOnChainService,
liquidTxWatcher,
)
swapService := swap.NewSwapService(swapServices)
if liquidTxWatcher != nil {
go func() {
err := liquidTxWatcher.StartWatchingTxs()
if err != nil {
log.Infof("%v", err)
os.Exit(1)
}
}()
}
err = swapService.Start()
if err != nil {
return err
}
// Try to upgrade version if needed
versionService, err := version.NewVersionService(swapDb)
if err != nil {
return err
}
err = versionService.SafeUpgrade(swapService)
if err != nil {
return err
}
err = swapService.RecoverSwaps()
if err != nil {
return err
}
pollStore, err := poll.NewStore(swapDb)
if err != nil {
return err
}
pollService := poll.NewService(1*time.Hour, 2*time.Hour, pollStore, lnd, pol, lnd, supportedAssets)
pollService.Start()
defer pollService.Stop()
// Add poll handler to peer event listener.
err = peerListener.AddHandler(lnrpc.PeerEvent_PEER_ONLINE, pollService.Poll)
if err != nil {
return err
}
// Start internal lnd listener.
lnd.StartListening()
// setup grpc server
sp := swap.NewRequestedSwapsPrinter(requestedSwapStore)
peerswaprpcServer := peerswaprpc.NewPeerswapServer(
liquidRpcWallet,
swapService,
sp,
pollService,
pol,
liquidCli,
lnrpc.NewLightningClient(cc),
sigChan,
)
lis, err := net.Listen("tcp", cfg.Host)
if err != nil {
return err
}
defer lis.Close()
grpcSrv := grpc.NewServer()
peerswaprpc.RegisterPeerSwapServer(grpcSrv, peerswaprpcServer)
go func() {
err := grpcSrv.Serve(lis)
if err != nil {
core_log.Fatal(err)
}
}()
defer grpcSrv.Stop()
log.Infof("peerswapd grpc listening on %v", cfg.Host)
if cfg.RestHost != "" {
mux := runtime.NewServeMux(
runtime.WithMarshalerOption(runtime.MIMEWildcard, &runtime.JSONPb{
MarshalOptions: protojson.MarshalOptions{
UseProtoNames: true,
EmitUnpopulated: true,
},
UnmarshalOptions: protojson.UnmarshalOptions{
DiscardUnknown: true,
},
}),
)
opts := []grpc.DialOption{grpc.WithTransportCredentials(insecure.NewCredentials())}
err := peerswaprpc.RegisterPeerSwapHandlerFromEndpoint(ctx, mux, cfg.Host, opts)
if err != nil {
return err
}
go func() {
err := http.ListenAndServe(cfg.RestHost, mux)
if err != nil {
core_log.Fatal(err)
}
}()
log.Infof("peerswapd rest listening on %v", cfg.RestHost)
}
<-shutdown
return nil
}
func getBitcoinChain(ctx context.Context, li lnrpc.LightningClient) (*chaincfg.Params, error) {
gi, err := li.GetInfo(ctx, &lnrpc.GetInfoRequest{})
if err != nil {
return nil, err
}
switch gi.Chains[0].Network {
case "regtest":
return &chaincfg.RegressionNetParams, nil
case "testnet":
return &chaincfg.TestNet3Params, nil
case "signet":
return &chaincfg.SigNetParams, nil
case "bitcoin":
return &chaincfg.MainNetParams, nil
case "mainnet":
return &chaincfg.MainNetParams, nil
default:
return nil, errors.New("unknown bitcoin network")
}
}
func getBitcoinClient(cfg *peerswaplnd.OnchainConfig) (*gbitcoin.Bitcoin, error) {
bitcoin := gbitcoin.NewBitcoin(cfg.RpcUser, cfg.RpcPassword)
err := bitcoin.StartUp(cfg.RpcHost, "", cfg.RpcPort)
if err != nil {
return nil, err
}
return bitcoin, nil
}
func getLiquidChain(li *gelements.Elements) (*network.Network, error) {
bi, err := li.GetChainInfo()
if err != nil {
return nil, err
}
switch bi.Chain {
case "liquidv1":
return &network.Liquid, nil
case "liquidregtest":
return &network.Regtest, nil
case "liquidtestnet":
return &network.Testnet, nil
default:
return &network.Testnet, nil
}
}
func loadConfig() (*peerswaplnd.PeerSwapConfig, error) {
cfg := peerswaplnd.DefaultConfig()
parser := flags.NewParser(cfg, flags.Default)
_, err := parser.Parse()
if err != nil {
return nil, err
}
if _, err := os.Stat(cfg.ConfigFile); err == nil {
fileParser := flags.NewParser(cfg, flags.Default|flags.IgnoreUnknown)
err = flags.NewIniParser(fileParser).ParseFile(cfg.ConfigFile)
if err != nil {
return nil, err
}
}
flagParser := flags.NewParser(cfg, flags.Default)
if _, err := flagParser.Parse(); err != nil {
return nil, err
}
err = makeDirectories(cfg.DataDir)
if err != nil {
return nil, err
}
return cfg, nil
}
func makeDirectories(fullDir string) error {
err := os.MkdirAll(fullDir, 0700)
if err != nil {
// Show a nicer error message if it's because a symlink is
// linked to a directory that does not exist (probably because
// it's not mounted).
if e, ok := err.(*os.PathError); ok && os.IsExist(err) {
if link, lerr := os.Readlink(e.Path); lerr == nil {
str := "is symlink %s -> %s mounted?"
err = fmt.Errorf(str, e.Path, link)
}
}
err := fmt.Errorf("failed to create directory %v: %v", fullDir,
err)
_, _ = fmt.Fprintln(os.Stderr, err)
return err
}
return nil
}
func checkLndVersion(fullVersionString string) error {
splitString := strings.Split(fullVersionString, "-")
// remove first two chars
versionString := splitString[0][2:]
versionFloat, err := strconv.ParseFloat(versionString, 64)
if err != nil {
return err
}
if versionFloat < minLndVersion {
return errors.New(fmt.Sprintf("Lnd version unsupported, requires %v", minLndVersion))
}
return nil
}
type LndLogger struct {
loglevel peerswaplnd.LogLevel
}
func NewLndLogger(cfg *peerswaplnd.PeerSwapConfig) (*LndLogger, func() error, error) {
logFile, err := os.OpenFile(filepath.Join(cfg.DataDir, "log"), os.O_RDWR|os.O_CREATE|os.O_APPEND, 0666)
if err != nil {
return nil, nil, err
}
w := io.MultiWriter(os.Stdout, logFile)
core_log.SetFlags(core_log.LstdFlags | core_log.LUTC)
core_log.SetOutput(w)
return &LndLogger{loglevel: cfg.LogLevel}, logFile.Close, nil
}
func (l *LndLogger) Infof(format string, v ...interface{}) {
core_log.Printf("[INFO] "+format, v...)
}
func (l *LndLogger) Debugf(format string, v ...interface{}) {
if l.loglevel == peerswaplnd.LOGLEVEL_DEBUG {
core_log.Printf("[DEBUG] "+format, v...)
}
}
// waitForLndSynced waits until cln is synced to the blockchain and the network.
// This call is blocking.
func waitForLndSynced(lnd lnrpc.LightningClient, tick time.Duration) error {
ticker := time.NewTicker(tick)
defer ticker.Stop()
for {
select {
case <-ticker.C:
info, err := lnd.GetInfo(context.Background(), &lnrpc.GetInfoRequest{})
if err != nil {
return err
}
if info.SyncedToChain {
return nil
}
}
}
}