min_relay_fee check during channel funding

chain_bridge.go

@@ -18,7 +18,6 @@ import (
 	"github.com/lightninglabs/taproot-assets/tapgarden"
 	"github.com/lightningnetwork/lnd/chainntnfs"
 	"github.com/lightningnetwork/lnd/funding"
-	"github.com/lightningnetwork/lnd/lnrpc/verrpc"
 	"github.com/lightningnetwork/lnd/lnwallet/chainfee"
 	"github.com/lightningnetwork/lnd/lnwire"
 	"github.com/lightningnetwork/lnd/routing/route"
@@ -37,8 +36,6 @@ const (
 type LndRpcChainBridge struct {
 	lnd *lndclient.LndServices
 
-	getBlockHeaderSupported *bool
-
 	blockTimestampCache *lru.Cache[uint32, cacheableTimestamp]
 
 	assetStore *tapdb.AssetStore
@@ -138,31 +135,6 @@ func (l *LndRpcChainBridge) GetBlockHash(ctx context.Context,
 	return blockHash, nil
 }
 
-// GetBlockHeaderSupported returns true if the chain backend supports the
-// `GetBlockHeader` RPC call.
-func (l *LndRpcChainBridge) GetBlockHeaderSupported(ctx context.Context) bool {
-	// Check if we've already asserted the compatibility of the chain
-	// backend.
-	if l.getBlockHeaderSupported != nil {
-		return *l.getBlockHeaderSupported
-	}
-
-	// The ChainKit.GetBlockHeader() RPC call was added in lnd v0.17.1.
-	getBlockHeaderMinimalVersion := &verrpc.Version{
-		AppMajor: 0,
-		AppMinor: 17,
-		AppPatch: 1,
-	}
-
-	getBlockHeaderUnsupported := lndclient.AssertVersionCompatible(
-		l.lnd.Version, getBlockHeaderMinimalVersion,
-	)
-	getBlockHeaderSupported := getBlockHeaderUnsupported == nil
-
-	l.getBlockHeaderSupported = &getBlockHeaderSupported
-	return *l.getBlockHeaderSupported
-}
-
 // VerifyBlock returns an error if a block (with given header and height) is not
 // present on-chain. It also checks to ensure that block height corresponds to
 // the given block header.
@@ -194,12 +166,7 @@ func (l *LndRpcChainBridge) VerifyBlock(ctx context.Context,
 	// Ensure that the block header corresponds to a block on-chain. Fetch
 	// only the corresponding block header and not the entire block if
 	// supported.
-	if l.GetBlockHeaderSupported(ctx) {
-		_, err = l.GetBlockHeader(ctx, header.BlockHash())
-		return err
-	}
-
-	_, err = l.GetBlock(ctx, header.BlockHash())
+	_, err = l.GetBlockHeader(ctx, header.BlockHash())
 	return err
 }
 
@@ -233,20 +200,10 @@ func (l *LndRpcChainBridge) GetBlockTimestamp(ctx context.Context,
 		return 0
 	}
 
-	// Let's see if we can get the block header directly.
-	var header *wire.BlockHeader
-	if l.GetBlockHeaderSupported(ctx) {
-		header, err = l.GetBlockHeader(ctx, hash)
-		if err != nil {
-			return 0
-		}
-	} else {
-		block, err := l.lnd.ChainKit.GetBlock(ctx, hash)
-		if err != nil {
-			return 0
-		}
-
-		header = &block.Header
+	// Get block header.
+	header, err := l.GetBlockHeader(ctx, hash)
+	if err != nil {
+		return 0
 	}
 
 	ts := uint32(header.Timestamp.Unix())

docs/examples/basic-price-oracle/go.mod

@@ -92,7 +92,7 @@ require (
 	github.com/kkdai/bstream v1.0.0 // indirect
 	github.com/lib/pq v1.10.9 // indirect
 	github.com/lightninglabs/gozmq v0.0.0-20191113021534-d20a764486bf // indirect
-	github.com/lightninglabs/lndclient v0.18.4-1 // indirect
+	github.com/lightninglabs/lndclient v0.18.4-3 // indirect
 	github.com/lightninglabs/neutrino v0.16.1-0.20240425105051-602843d34ffd // indirect
 	github.com/lightninglabs/neutrino/cache v1.1.2 // indirect
 	github.com/lightningnetwork/lightning-onion v1.2.1-0.20240712235311-98bd56499dfb // indirect

docs/examples/basic-price-oracle/go.sum

@@ -418,8 +418,8 @@ github.com/lightninglabs/gozmq v0.0.0-20191113021534-d20a764486bf/go.mod h1:vxmQ
 github.com/lightninglabs/lightning-node-connect v0.2.5-alpha h1:ZRVChwczFXK0CEbxOCWwUA6TIZvrkE0APd1T3WjFAwg=
 github.com/lightninglabs/lightning-node-connect/hashmailrpc v1.0.2 h1:Er1miPZD2XZwcfE4xoS5AILqP1mj7kqnhbBSxW9BDxY=
 github.com/lightninglabs/lightning-node-connect/hashmailrpc v1.0.2/go.mod h1:antQGRDRJiuyQF6l+k6NECCSImgCpwaZapATth2Chv4=
-github.com/lightninglabs/lndclient v0.18.4-1 h1:k2UnxHGNH243NRe5/dL2sKgrxc8WMHbFQRdnCtfilwc=
-github.com/lightninglabs/lndclient v0.18.4-1/go.mod h1:/HLqmZGL9MtP8F1g+laq+L9VrsugBN5tsTct3C5wWCg=
+github.com/lightninglabs/lndclient v0.18.4-3 h1:Xk3ZuCQE4ZlF70jaToryL2MvRcryiE0zTfUjJbmzUBY=
+github.com/lightninglabs/lndclient v0.18.4-3/go.mod h1:/HLqmZGL9MtP8F1g+laq+L9VrsugBN5tsTct3C5wWCg=
 github.com/lightninglabs/neutrino v0.16.1-0.20240425105051-602843d34ffd h1:D8aRocHpoCv43hL8egXEMYyPmyOiefFHZ66338KQB2s=
 github.com/lightninglabs/neutrino v0.16.1-0.20240425105051-602843d34ffd/go.mod h1:x3OmY2wsA18+Kc3TSV2QpSUewOCiscw2mKpXgZv2kZk=
 github.com/lightninglabs/neutrino/cache v1.1.2 h1:C9DY/DAPaPxbFC+xNNEI/z1SJY9GS3shmlu5hIQ798g=

go.mod

@@ -26,7 +26,7 @@ require (
 	github.com/lib/pq v1.10.9
 	github.com/lightninglabs/aperture v0.3.2-beta.0.20241015115230-d59b5514c19a
 	github.com/lightninglabs/lightning-node-connect/hashmailrpc v1.0.2
-	github.com/lightninglabs/lndclient v0.18.4-1
+	github.com/lightninglabs/lndclient v0.18.4-3
 	github.com/lightninglabs/neutrino/cache v1.1.2
 	github.com/lightningnetwork/lnd v0.18.3-beta.rc3.0.20241025090009-615f3d633e61
 	github.com/lightningnetwork/lnd/cert v1.2.2

go.sum

@@ -486,8 +486,8 @@ github.com/lightninglabs/lightning-node-connect v0.2.5-alpha h1:ZRVChwczFXK0CEbx
 github.com/lightninglabs/lightning-node-connect v0.2.5-alpha/go.mod h1:A9Pof9fETkH+F67BnOmrBDThPKstqp73wlImWOZvTXQ=
 github.com/lightninglabs/lightning-node-connect/hashmailrpc v1.0.2 h1:Er1miPZD2XZwcfE4xoS5AILqP1mj7kqnhbBSxW9BDxY=
 github.com/lightninglabs/lightning-node-connect/hashmailrpc v1.0.2/go.mod h1:antQGRDRJiuyQF6l+k6NECCSImgCpwaZapATth2Chv4=
-github.com/lightninglabs/lndclient v0.18.4-1 h1:k2UnxHGNH243NRe5/dL2sKgrxc8WMHbFQRdnCtfilwc=
-github.com/lightninglabs/lndclient v0.18.4-1/go.mod h1:/HLqmZGL9MtP8F1g+laq+L9VrsugBN5tsTct3C5wWCg=
+github.com/lightninglabs/lndclient v0.18.4-3 h1:Xk3ZuCQE4ZlF70jaToryL2MvRcryiE0zTfUjJbmzUBY=
+github.com/lightninglabs/lndclient v0.18.4-3/go.mod h1:/HLqmZGL9MtP8F1g+laq+L9VrsugBN5tsTct3C5wWCg=
 github.com/lightninglabs/neutrino v0.16.1-0.20240425105051-602843d34ffd h1:D8aRocHpoCv43hL8egXEMYyPmyOiefFHZ66338KQB2s=
 github.com/lightninglabs/neutrino v0.16.1-0.20240425105051-602843d34ffd/go.mod h1:x3OmY2wsA18+Kc3TSV2QpSUewOCiscw2mKpXgZv2kZk=
 github.com/lightninglabs/neutrino/cache v1.1.2 h1:C9DY/DAPaPxbFC+xNNEI/z1SJY9GS3shmlu5hIQ798g=

rpcserver.go

@@ -52,7 +52,6 @@ import (
 	"github.com/lightningnetwork/lnd/build"
 	"github.com/lightningnetwork/lnd/keychain"
 	"github.com/lightningnetwork/lnd/lnrpc"
-	"github.com/lightningnetwork/lnd/lnrpc/verrpc"
 	"github.com/lightningnetwork/lnd/lnrpc/walletrpc"
 	"github.com/lightningnetwork/lnd/lnwallet/chainfee"
 	"github.com/lightningnetwork/lnd/lnwire"
@@ -78,17 +77,6 @@ var (
 	// P2TRChangeType is the type of change address that should be used for
 	// funding PSBTs, as we'll always want to use P2TR change addresses.
 	P2TRChangeType = walletrpc.ChangeAddressType_CHANGE_ADDRESS_TYPE_P2TR
-
-	// fundPsbtCoinSelectVersion is the version of lnd that enabled better
-	// coin selection support in the FundPsbt RPC call.
-	fundPsbtCoinSelectVersion = &verrpc.Version{
-		AppMajor: 0,
-		AppMinor: 17,
-		AppPatch: 99,
-		BuildTags: []string{
-			"signrpc", "walletrpc", "chainrpc", "invoicesrpc",
-		},
-	}
 )
 
 const (
@@ -2304,22 +2292,6 @@ func (r *rpcServer) CommitVirtualPsbts(ctx context.Context,
 	req *wrpc.CommitVirtualPsbtsRequest) (*wrpc.CommitVirtualPsbtsResponse,
 	error) {
 
-	// For this call we require `lnd` to be at least v0.17.99-beta (which
-	// will become v0.18.0-beta eventually) as we need the new coin
-	// selection mode in the FundPsbt call.
-	fundPsbtCoinSelectNotSupportedErr := fmt.Errorf("connected lnd "+
-		"version %v does not support advanced coin selection in the "+
-		"FundPsbt RPC, need at least v%d.%d.%d for this call",
-		r.cfg.Lnd.Version.Version, fundPsbtCoinSelectVersion.AppMajor,
-		fundPsbtCoinSelectVersion.AppMinor,
-		fundPsbtCoinSelectVersion.AppPatch)
-	verErr := lndclient.AssertVersionCompatible(
-		r.cfg.Lnd.Version, fundPsbtCoinSelectVersion,
-	)
-	if verErr != nil {
-		return nil, fundPsbtCoinSelectNotSupportedErr
-	}
-
 	if len(req.VirtualPsbts) == 0 {
 		return nil, fmt.Errorf("no virtual PSBTs specified")
 	}

tapcfg/config.go

@@ -186,8 +186,8 @@ var (
 	// required in lnd to run tapd.
 	minimalCompatibleVersion = &verrpc.Version{
 		AppMajor: 0,
-		AppMinor: 17,
-		AppPatch: 99,
+		AppMinor: 18,
+		AppPatch: 4,
 
 		// We don't actually require the invoicesrpc calls. But if we
 		// try to use lndclient on an lnd that doesn't have it enabled,

tapchannel/aux_funding_controller.go

@@ -1354,6 +1354,18 @@ func (f *FundingController) processFundingReq(fundingFlows fundingFlowIndex,
 			fundReq.PeerPub.SerializeCompressed())
 	}
 
+	// Before we proceed, we'll make sure the fee rate we're using is above
+	// the min relay fee.
+	minRelayFee, err := f.cfg.ChainWallet.MinRelayFee(fundReq.ctx)
+	if err != nil {
+		return fmt.Errorf("unable to establish min_relay_fee: %w",
+			err)
+	}
+	if fundReq.FeeRate.FeePerKWeight() < minRelayFee {
+		return fmt.Errorf("fee rate %v too low, min_relay_fee: %v",
+			fundReq.FeeRate.FeePerKWeight(), minRelayFee)
+	}
+
 	// To start, we'll make a new pending asset funding desc. This'll be
 	// our scratch pad during the asset funding process.
 	tempPID, err := newPendingChanID()

tapgarden/interface.go

@@ -372,6 +372,10 @@ type WalletAnchor interface {
 	// relevant to the wallet are sent over.
 	SubscribeTransactions(context.Context) (<-chan lndclient.Transaction,
 		<-chan error, error)
+
+	// MinRelayFee returns the current minimum relay fee based on
+	// our chain backend in sat/kw.
+	MinRelayFee(ctx context.Context) (chainfee.SatPerKWeight, error)
 }
 
 // KeyRing is a mirror of the keychain.KeyRing interface, with the addition of

tapgarden/mock.go

@@ -302,6 +302,14 @@ func (m *MockWalletAnchor) ListTransactions(ctx context.Context, _, _ int32,
 	return m.Transactions, nil
 }
 
+// MinRelayFee estimates the minimum fee rate required for a
+// transaction.
+func (m *MockWalletAnchor) MinRelayFee(
+	ctx context.Context) (chainfee.SatPerKWeight, error) {
+
+	return chainfee.SatPerKWeight(10), nil
+}
+
 type MockChainBridge struct {
 	FeeEstimateSignal chan struct{}
 	PublishReq        chan *wire.MsgTx

wallet_anchor.go

@@ -218,6 +218,14 @@ func (l *LndRpcWalletAnchor) ListChannels(
 	return l.lnd.Client.ListChannels(ctx, true, false)
 }
 
+// MinRelayFee estimates the minimum fee rate required for a
+// transaction.
+func (l *LndRpcWalletAnchor) MinRelayFee(
+	ctx context.Context) (chainfee.SatPerKWeight, error) {
+
+	return l.lnd.WalletKit.MinRelayFee(ctx)
+}
+
 // A compile time assertion to ensure LndRpcWalletAnchor meets the
 // tapgarden.WalletAnchor interface.
 var _ tapgarden.WalletAnchor = (*LndRpcWalletAnchor)(nil)