mirror of
https://github.com/aljazceru/lspd.git
synced 2025-12-18 22:34:22 +01:00
303 lines
8.7 KiB
Go
303 lines
8.7 KiB
Go
package main
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import (
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"bytes"
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"context"
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"encoding/hex"
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"fmt"
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"log"
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"math/big"
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"time"
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"github.com/breez/lspd/chain"
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"github.com/breez/lspd/config"
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"github.com/breez/lspd/interceptor"
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"github.com/breez/lspd/lightning"
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"github.com/btcsuite/btcd/btcec/v2"
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"github.com/btcsuite/btcd/wire"
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sphinx "github.com/lightningnetwork/lightning-onion"
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"github.com/lightningnetwork/lnd/lnwire"
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"github.com/lightningnetwork/lnd/record"
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"github.com/lightningnetwork/lnd/routing/route"
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"golang.org/x/sync/singleflight"
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)
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type interceptAction int
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const (
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INTERCEPT_RESUME interceptAction = 0
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INTERCEPT_RESUME_WITH_ONION interceptAction = 1
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INTERCEPT_FAIL_HTLC_WITH_CODE interceptAction = 2
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)
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type interceptFailureCode uint16
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var (
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FAILURE_TEMPORARY_CHANNEL_FAILURE interceptFailureCode = 0x1007
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FAILURE_TEMPORARY_NODE_FAILURE interceptFailureCode = 0x2002
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FAILURE_INCORRECT_OR_UNKNOWN_PAYMENT_DETAILS interceptFailureCode = 0x400F
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)
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var payHashGroup singleflight.Group
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var feeEstimator chain.FeeEstimator
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var feeStrategy chain.FeeStrategy
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type interceptResult struct {
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action interceptAction
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failureCode interceptFailureCode
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destination []byte
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amountMsat uint64
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channelPoint *wire.OutPoint
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channelId uint64
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onionBlob []byte
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}
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type Interceptor struct {
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client lightning.Client
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config *config.NodeConfig
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store interceptor.InterceptStore
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}
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func NewInterceptor(
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client lightning.Client,
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config *config.NodeConfig,
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store interceptor.InterceptStore,
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) *Interceptor {
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return &Interceptor{
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client: client,
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config: config,
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store: store,
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}
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}
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func (i *Interceptor) Intercept(nextHop string, reqPaymentHash []byte, reqOutgoingAmountMsat uint64, reqOutgoingExpiry uint32, reqIncomingExpiry uint32) interceptResult {
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reqPaymentHashStr := hex.EncodeToString(reqPaymentHash)
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resp, _, _ := payHashGroup.Do(reqPaymentHashStr, func() (interface{}, error) {
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paymentHash, paymentSecret, destination, incomingAmountMsat, outgoingAmountMsat, channelPoint, err := i.store.PaymentInfo(reqPaymentHash)
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if err != nil {
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log.Printf("paymentInfo(%x) error: %v", reqPaymentHash, err)
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return interceptResult{
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action: INTERCEPT_FAIL_HTLC_WITH_CODE,
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failureCode: FAILURE_TEMPORARY_NODE_FAILURE,
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}, nil
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}
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log.Printf("paymentHash:%x\npaymentSecret:%x\ndestination:%x\nincomingAmountMsat:%v\noutgoingAmountMsat:%v",
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paymentHash, paymentSecret, destination, incomingAmountMsat, outgoingAmountMsat)
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if paymentSecret == nil || (nextHop != "<unknown>" && nextHop != hex.EncodeToString(destination)) {
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return interceptResult{
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action: INTERCEPT_RESUME,
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}, nil
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}
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if channelPoint == nil {
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if bytes.Equal(paymentHash, reqPaymentHash) {
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if int64(reqIncomingExpiry)-int64(reqOutgoingExpiry) < int64(i.config.TimeLockDelta) {
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return interceptResult{
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action: INTERCEPT_FAIL_HTLC_WITH_CODE,
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failureCode: FAILURE_TEMPORARY_CHANNEL_FAILURE,
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}, nil
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}
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channelPoint, err = i.openChannel(reqPaymentHash, destination, incomingAmountMsat)
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if err != nil {
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log.Printf("openChannel(%x, %v) err: %v", destination, incomingAmountMsat, err)
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return interceptResult{
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action: INTERCEPT_FAIL_HTLC_WITH_CODE,
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failureCode: FAILURE_TEMPORARY_CHANNEL_FAILURE,
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}, nil
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}
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} else { //probing
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return interceptResult{
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action: INTERCEPT_FAIL_HTLC_WITH_CODE,
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failureCode: FAILURE_INCORRECT_OR_UNKNOWN_PAYMENT_DETAILS,
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}, nil
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}
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}
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pubKey, err := btcec.ParsePubKey(destination)
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if err != nil {
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log.Printf("btcec.ParsePubKey(%x): %v", destination, err)
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return interceptResult{
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action: INTERCEPT_FAIL_HTLC_WITH_CODE,
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failureCode: FAILURE_TEMPORARY_CHANNEL_FAILURE,
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}, nil
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}
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sessionKey, err := btcec.NewPrivateKey()
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if err != nil {
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log.Printf("btcec.NewPrivateKey(): %v", err)
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return interceptResult{
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action: INTERCEPT_FAIL_HTLC_WITH_CODE,
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failureCode: FAILURE_TEMPORARY_CHANNEL_FAILURE,
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}, nil
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}
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var bigProd, bigAmt big.Int
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amt := (bigAmt.Div(bigProd.Mul(big.NewInt(outgoingAmountMsat), big.NewInt(int64(reqOutgoingAmountMsat))), big.NewInt(incomingAmountMsat))).Int64()
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var addr [32]byte
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copy(addr[:], paymentSecret)
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hop := route.Hop{
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AmtToForward: lnwire.MilliSatoshi(amt),
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OutgoingTimeLock: reqOutgoingExpiry,
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MPP: record.NewMPP(lnwire.MilliSatoshi(outgoingAmountMsat), addr),
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CustomRecords: make(record.CustomSet),
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}
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var b bytes.Buffer
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err = hop.PackHopPayload(&b, uint64(0))
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if err != nil {
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log.Printf("hop.PackHopPayload(): %v", err)
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return interceptResult{
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action: INTERCEPT_FAIL_HTLC_WITH_CODE,
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failureCode: FAILURE_TEMPORARY_CHANNEL_FAILURE,
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}, nil
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}
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payload, err := sphinx.NewHopPayload(nil, b.Bytes())
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if err != nil {
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log.Printf("sphinx.NewHopPayload(): %v", err)
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return interceptResult{
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action: INTERCEPT_FAIL_HTLC_WITH_CODE,
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failureCode: FAILURE_TEMPORARY_CHANNEL_FAILURE,
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}, nil
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}
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var sphinxPath sphinx.PaymentPath
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sphinxPath[0] = sphinx.OnionHop{
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NodePub: *pubKey,
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HopPayload: payload,
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}
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sphinxPacket, err := sphinx.NewOnionPacket(
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&sphinxPath, sessionKey, reqPaymentHash,
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sphinx.DeterministicPacketFiller,
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)
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if err != nil {
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log.Printf("sphinx.NewOnionPacket(): %v", err)
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return interceptResult{
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action: INTERCEPT_FAIL_HTLC_WITH_CODE,
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failureCode: FAILURE_TEMPORARY_CHANNEL_FAILURE,
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}, nil
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}
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var onionBlob bytes.Buffer
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err = sphinxPacket.Encode(&onionBlob)
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if err != nil {
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log.Printf("sphinxPacket.Encode(): %v", err)
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return interceptResult{
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action: INTERCEPT_FAIL_HTLC_WITH_CODE,
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failureCode: FAILURE_TEMPORARY_CHANNEL_FAILURE,
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}, nil
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}
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deadline := time.Now().Add(60 * time.Second)
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for {
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chanResult, _ := i.client.GetChannel(destination, *channelPoint)
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if chanResult != nil {
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log.Printf("channel opended successfully alias: %v, confirmed: %v", chanResult.InitialChannelID.ToString(), chanResult.ConfirmedChannelID.ToString())
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err := i.store.InsertChannel(
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uint64(chanResult.InitialChannelID),
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uint64(chanResult.ConfirmedChannelID),
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channelPoint.String(),
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destination,
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time.Now(),
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)
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if err != nil {
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log.Printf("insertChannel error: %v", err)
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return interceptResult{
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action: INTERCEPT_FAIL_HTLC_WITH_CODE,
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failureCode: FAILURE_TEMPORARY_CHANNEL_FAILURE,
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}, nil
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}
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channelID := uint64(chanResult.ConfirmedChannelID)
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if channelID == 0 {
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channelID = uint64(chanResult.InitialChannelID)
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}
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return interceptResult{
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action: INTERCEPT_RESUME_WITH_ONION,
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destination: destination,
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channelPoint: channelPoint,
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channelId: channelID,
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amountMsat: uint64(amt),
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onionBlob: onionBlob.Bytes(),
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}, nil
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}
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log.Printf("waiting for channel to get opened.... %v\n", destination)
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if time.Now().After(deadline) {
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log.Printf("Stop retrying getChannel(%v, %v)", destination, channelPoint.String())
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break
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}
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<-time.After(1 * time.Second)
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}
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log.Printf("Error: Channel failed to opened... timed out. ")
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return interceptResult{
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action: INTERCEPT_FAIL_HTLC_WITH_CODE,
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failureCode: FAILURE_TEMPORARY_CHANNEL_FAILURE,
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}, nil
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})
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return resp.(interceptResult)
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}
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func (i *Interceptor) openChannel(paymentHash, destination []byte, incomingAmountMsat int64) (*wire.OutPoint, error) {
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capacity := incomingAmountMsat/1000 + i.config.AdditionalChannelCapacity
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if capacity == i.config.PublicChannelAmount {
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capacity++
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}
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var targetConf *uint32
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confStr := "<nil>"
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var feeEstimation *float64
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feeStr := "<nil>"
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if feeEstimator != nil {
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fee, err := feeEstimator.EstimateFeeRate(
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context.Background(),
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feeStrategy,
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)
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if err == nil {
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feeEstimation = &fee.SatPerVByte
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feeStr = fmt.Sprintf("%.5f", *feeEstimation)
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} else {
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log.Printf("Error estimating chain fee, fallback to target conf: %v", err)
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targetConf = &i.config.TargetConf
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confStr = fmt.Sprintf("%v", *targetConf)
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}
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}
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log.Printf(
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"Opening zero conf channel. Destination: %x, capacity: %v, fee: %s, targetConf: %s",
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destination,
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capacity,
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feeStr,
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confStr,
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)
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channelPoint, err := i.client.OpenChannel(&lightning.OpenChannelRequest{
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Destination: destination,
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CapacitySat: uint64(capacity),
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MinConfs: i.config.MinConfs,
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IsPrivate: true,
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IsZeroConf: true,
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FeeSatPerVByte: feeEstimation,
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TargetConf: targetConf,
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})
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if err != nil {
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log.Printf("client.OpenChannelSync(%x, %v) error: %v", destination, capacity, err)
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return nil, err
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}
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sendOpenChannelEmailNotification(
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paymentHash,
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incomingAmountMsat,
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destination,
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capacity,
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channelPoint.String(),
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)
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err = i.store.SetFundingTx(paymentHash, channelPoint)
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return channelPoint, err
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}
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