diff --git a/cmd/commands/walletrpc_active.go b/cmd/commands/walletrpc_active.go index 650388412a..bb5982c78b 100644 --- a/cmd/commands/walletrpc_active.go +++ b/cmd/commands/walletrpc_active.go @@ -1252,6 +1252,12 @@ var fundPsbtCommand = cli.Command{ Value: defaultUtxoMinConf, }, coinSelectionStrategyFlag, + cli.Float64Flag{ + Name: "max_fee_ratio", + Usage: "the maximum fee to total output amount ratio " + + "that this psbt should adhere to", + Value: chanfunding.DefaultMaxFeeRatio, + }, }, Action: actionDecorator(fundPsbt), } @@ -1390,6 +1396,8 @@ func fundPsbt(ctx *cli.Context) error { } } + req.MaxFeeRatio = ctx.Float64("max_fee_ratio") + walletClient, cleanUp := getWalletClient(ctx) defer cleanUp() diff --git a/docs/release-notes/release-notes-0.19.0.md b/docs/release-notes/release-notes-0.19.0.md index 11613fcecd..2bbcc4d589 100644 --- a/docs/release-notes/release-notes-0.19.0.md +++ b/docs/release-notes/release-notes-0.19.0.md @@ -52,6 +52,9 @@ `sat_per_kw` which allows for more precise fees](https://github.com/lightningnetwork/lnd/pull/9013). +* [The `walletrpc.FundPsbt` method now has a new option to specify the maximum + fee to output amounts ratio.](https://github.com/lightningnetwork/lnd/pull/8600) + ## lncli Additions * [A pre-generated macaroon root key can now be specified in `lncli create` and @@ -62,6 +65,9 @@ specify more precise fee rates](https://github.com/lightningnetwork/lnd/pull/9013). +* The `lncli wallet fundpsbt` command now has a [`--max_fee_ratio` argument to + specify the max fees to output amounts ratio.](https://github.com/lightningnetwork/lnd/pull/8600) + # Improvements ## Functional Updates @@ -151,6 +157,7 @@ * Boris Nagaev * CharlieZKSmith * Elle Mouton +* George Tsagkarelis * Pins * Viktor Tigerström * Ziggie diff --git a/lnrpc/walletrpc/walletkit.pb.go b/lnrpc/walletrpc/walletkit.pb.go index c2ac8a8a5b..dad0aac608 100644 --- a/lnrpc/walletrpc/walletkit.pb.go +++ b/lnrpc/walletrpc/walletkit.pb.go @@ -3662,6 +3662,8 @@ type FundPsbtRequest struct { ChangeType ChangeAddressType `protobuf:"varint,8,opt,name=change_type,json=changeType,proto3,enum=walletrpc.ChangeAddressType" json:"change_type,omitempty"` // The strategy to use for selecting coins during funding the PSBT. CoinSelectionStrategy lnrpc.CoinSelectionStrategy `protobuf:"varint,10,opt,name=coin_selection_strategy,json=coinSelectionStrategy,proto3,enum=lnrpc.CoinSelectionStrategy" json:"coin_selection_strategy,omitempty"` + // The max fee to total output amount ratio that this psbt should adhere to. + MaxFeeRatio float64 `protobuf:"fixed64,12,opt,name=max_fee_ratio,json=maxFeeRatio,proto3" json:"max_fee_ratio,omitempty"` } func (x *FundPsbtRequest) Reset() { @@ -3787,6 +3789,13 @@ func (x *FundPsbtRequest) GetCoinSelectionStrategy() lnrpc.CoinSelectionStrategy return lnrpc.CoinSelectionStrategy(0) } +func (x *FundPsbtRequest) GetMaxFeeRatio() float64 { + if x != nil { + return x.MaxFeeRatio + } + return 0 +} + type isFundPsbtRequest_Template interface { isFundPsbtRequest_Template() } @@ -4921,7 +4930,7 @@ var file_walletrpc_walletkit_proto_rawDesc = []byte{ 0x65, 0x6c, 0x12, 0x1c, 0x0a, 0x09, 0x6f, 0x76, 0x65, 0x72, 0x77, 0x72, 0x69, 0x74, 0x65, 0x18, 0x03, 0x20, 0x01, 0x28, 0x08, 0x52, 0x09, 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+1417,9 @@ message FundPsbtRequest { // The strategy to use for selecting coins during funding the PSBT. lnrpc.CoinSelectionStrategy coin_selection_strategy = 10; + + // The max fee to total output amount ratio that this psbt should adhere to. + double max_fee_ratio = 12; } message FundPsbtResponse { /* diff --git a/lnrpc/walletrpc/walletkit.swagger.json b/lnrpc/walletrpc/walletkit.swagger.json index dc5841d8c3..ab72f3a856 100644 --- a/lnrpc/walletrpc/walletkit.swagger.json +++ b/lnrpc/walletrpc/walletkit.swagger.json @@ -1589,6 +1589,11 @@ "coin_selection_strategy": { "$ref": "#/definitions/lnrpcCoinSelectionStrategy", "description": "The strategy to use for selecting coins during funding the PSBT." + }, + "max_fee_ratio": { + "type": "number", + "format": "double", + "description": "The max fee to total output amount ratio that this psbt should adhere to." } } }, diff --git a/lnrpc/walletrpc/walletkit_server.go b/lnrpc/walletrpc/walletkit_server.go index ff506de40d..6be185ca36 100644 --- a/lnrpc/walletrpc/walletkit_server.go +++ b/lnrpc/walletrpc/walletkit_server.go @@ -1626,11 +1626,17 @@ func (w *WalletKit) FundPsbt(_ context.Context, return nil, fmt.Errorf("unknown change output type") } + maxFeeRatio := chanfunding.DefaultMaxFeeRatio + + if req.MaxFeeRatio != 0 { + maxFeeRatio = req.MaxFeeRatio + } + // Run the actual funding process now, using the channel funding // coin selection algorithm. return w.fundPsbtCoinSelect( account, changeIndex, packet, minConfs, changeType, - feeSatPerKW, coinSelectionStrategy, + feeSatPerKW, coinSelectionStrategy, maxFeeRatio, ) // The template is specified as a RPC message. We need to create a new @@ -1833,8 +1839,8 @@ func (w *WalletKit) fundPsbtInternalWallet(account string, func (w *WalletKit) fundPsbtCoinSelect(account string, changeIndex int32, packet *psbt.Packet, minConfs int32, changeType chanfunding.ChangeAddressType, - feeRate chainfee.SatPerKWeight, strategy base.CoinSelectionStrategy) ( - *FundPsbtResponse, error) { + feeRate chainfee.SatPerKWeight, strategy base.CoinSelectionStrategy, + maxFeeRatio float64) (*FundPsbtResponse, error) { // We want to make sure we don't select any inputs that are already // specified in the template. To do that, we require those inputs to @@ -1922,6 +1928,7 @@ func (w *WalletKit) fundPsbtCoinSelect(account string, changeIndex int32, changeAmt, needMore, err := chanfunding.CalculateChangeAmount( inputSum, outputSum, packetFeeNoChange, packetFeeWithChange, changeDustLimit, changeType, + maxFeeRatio, ) if err != nil { return nil, fmt.Errorf("error calculating change "+ @@ -1978,7 +1985,7 @@ func (w *WalletKit) fundPsbtCoinSelect(account string, changeIndex int32, selectedCoins, changeAmount, err := chanfunding.CoinSelect( feeRate, fundingAmount, changeDustLimit, coins, - strategy, estimator, changeType, + strategy, estimator, changeType, maxFeeRatio, ) if err != nil { return fmt.Errorf("error selecting coins: %w", err) diff --git a/lnrpc/walletrpc/walletkit_server_test.go b/lnrpc/walletrpc/walletkit_server_test.go index 115ccf96e0..d567eb028a 100644 --- a/lnrpc/walletrpc/walletkit_server_test.go +++ b/lnrpc/walletrpc/walletkit_server_test.go @@ -162,10 +162,18 @@ func TestFundPsbtCoinSelect(t *testing.T) { // packet in bytes. expectedFee btcutil.Amount + // maxFeeRatio is the maximum fee to total output amount ratio + // that we consider valid. + maxFeeRatio float64 + // expectedErr is the expected concrete error. If not nil, then // the error must match exactly. expectedErr error + // expectedContainedErrStr is the expected string to be + // contained in the returned error. + expectedContainedErrStr string + // expectedErrType is the expected error type. If not nil, then // the error must be of this type. expectedErrType error @@ -178,6 +186,7 @@ func TestFundPsbtCoinSelect(t *testing.T) { }), changeIndex: -1, feeRate: chainfee.FeePerKwFloor, + maxFeeRatio: chanfunding.DefaultMaxFeeRatio, expectedErrType: &chanfunding.ErrInsufficientFunds{}, }, { name: "1 p2wpkh utxo, add p2wkh change", @@ -193,6 +202,7 @@ func TestFundPsbtCoinSelect(t *testing.T) { }), changeIndex: -1, feeRate: chainfee.FeePerKwFloor, + maxFeeRatio: chanfunding.DefaultMaxFeeRatio, expectedUtxoIndexes: []int{0}, expectChangeOutputIndex: 1, expectedFee: calcFee(0, 1, 1, 1, 0), @@ -210,6 +220,7 @@ func TestFundPsbtCoinSelect(t *testing.T) { }), changeIndex: -1, feeRate: chainfee.FeePerKwFloor, + maxFeeRatio: chanfunding.DefaultMaxFeeRatio, changeType: chanfunding.P2TRChangeAddress, expectedUtxoIndexes: []int{0}, expectChangeOutputIndex: 1, @@ -228,6 +239,7 @@ func TestFundPsbtCoinSelect(t *testing.T) { }), changeIndex: -1, feeRate: chainfee.FeePerKwFloor, + maxFeeRatio: chanfunding.DefaultMaxFeeRatio, expectedUtxoIndexes: []int{0}, expectChangeOutputIndex: -1, expectedFee: calcFee(0, 1, 1, 0, 0), @@ -247,6 +259,7 @@ func TestFundPsbtCoinSelect(t *testing.T) { }), changeIndex: -1, feeRate: chainfee.FeePerKwFloor, + maxFeeRatio: chanfunding.DefaultMaxFeeRatio, changeType: chanfunding.P2WKHChangeAddress, expectedUtxoIndexes: []int{0}, expectChangeOutputIndex: -1, @@ -267,6 +280,7 @@ func TestFundPsbtCoinSelect(t *testing.T) { }), changeIndex: -1, feeRate: chainfee.FeePerKwFloor, + maxFeeRatio: chanfunding.DefaultMaxFeeRatio, changeType: chanfunding.P2TRChangeAddress, expectedUtxoIndexes: []int{0}, expectChangeOutputIndex: -1, @@ -285,6 +299,7 @@ func TestFundPsbtCoinSelect(t *testing.T) { }), changeIndex: 0, feeRate: chainfee.FeePerKwFloor, + maxFeeRatio: chanfunding.DefaultMaxFeeRatio, changeType: chanfunding.ExistingChangeAddress, expectedUtxoIndexes: []int{0}, expectChangeOutputIndex: 0, @@ -303,6 +318,7 @@ func TestFundPsbtCoinSelect(t *testing.T) { }), changeIndex: 0, feeRate: chainfee.FeePerKwFloor, + maxFeeRatio: chanfunding.DefaultMaxFeeRatio, changeType: chanfunding.ExistingChangeAddress, expectedUtxoIndexes: []int{0}, expectChangeOutputIndex: 0, @@ -321,6 +337,7 @@ func TestFundPsbtCoinSelect(t *testing.T) { }), changeIndex: 0, feeRate: chainfee.FeePerKwFloor, + maxFeeRatio: chanfunding.DefaultMaxFeeRatio, changeType: chanfunding.ExistingChangeAddress, expectedUtxoIndexes: []int{0}, expectChangeOutputIndex: 0, @@ -369,6 +386,7 @@ func TestFundPsbtCoinSelect(t *testing.T) { }), changeIndex: 0, feeRate: chainfee.FeePerKwFloor, + maxFeeRatio: chanfunding.DefaultMaxFeeRatio, changeType: chanfunding.ExistingChangeAddress, expectedUtxoIndexes: []int{0, 1}, expectChangeOutputIndex: 0, @@ -417,6 +435,7 @@ func TestFundPsbtCoinSelect(t *testing.T) { }), changeIndex: -1, feeRate: chainfee.FeePerKwFloor, + maxFeeRatio: chanfunding.DefaultMaxFeeRatio, changeType: chanfunding.P2TRChangeAddress, expectedUtxoIndexes: []int{0, 1}, expectChangeOutputIndex: 1, @@ -456,6 +475,7 @@ func TestFundPsbtCoinSelect(t *testing.T) { }), changeIndex: -1, feeRate: chainfee.FeePerKwFloor, + maxFeeRatio: chanfunding.DefaultMaxFeeRatio, changeType: chanfunding.P2WKHChangeAddress, expectedUtxoIndexes: []int{}, expectChangeOutputIndex: 1, @@ -497,10 +517,74 @@ func TestFundPsbtCoinSelect(t *testing.T) { }), changeIndex: -1, feeRate: chainfee.FeePerKwFloor, + maxFeeRatio: chanfunding.DefaultMaxFeeRatio, changeType: chanfunding.P2TRChangeAddress, expectedUtxoIndexes: []int{}, expectChangeOutputIndex: -1, expectedFee: calcFee(1, 0, 1, 0, 0), + }, { + name: "1 p2wpkh utxo, existing p2wkh change, invalid fee ratio", + utxos: []*lnwallet.Utxo{ + { + Value: 250, + PkScript: p2wkhScript, + }, + }, + packet: makePacket(&wire.TxOut{ + Value: 50, + PkScript: p2wkhScript, + }), + changeIndex: 0, + feeRate: chainfee.FeePerKwFloor, + maxFeeRatio: chanfunding.DefaultMaxFeeRatio, + changeType: chanfunding.ExistingChangeAddress, + expectedUtxoIndexes: []int{0}, + expectChangeOutputIndex: 0, + expectedFee: calcFee(0, 1, 0, 1, 0), + + expectedContainedErrStr: "fee 0.00000111 BTC exceeds max fee " + + "(0.00000027 BTC) on total output value", + }, { + name: "1 p2wpkh utxo, existing p2wkh change, negative feeratio", + utxos: []*lnwallet.Utxo{ + { + Value: 250, + PkScript: p2wkhScript, + }, + }, + packet: makePacket(&wire.TxOut{ + Value: 50, + PkScript: p2wkhScript, + }), + changeIndex: 0, + feeRate: chainfee.FeePerKwFloor, + maxFeeRatio: chanfunding.DefaultMaxFeeRatio * (-1), + changeType: chanfunding.ExistingChangeAddress, + expectedUtxoIndexes: []int{0}, + expectChangeOutputIndex: 0, + expectedFee: calcFee(0, 1, 0, 1, 0), + + expectedContainedErrStr: "maxFeeRatio must be between 0.00 " + + "and 1.00 got -0.20", + }, { + name: "1 p2wpkh utxo, existing p2wkh change, big fee ratio", + utxos: []*lnwallet.Utxo{ + { + Value: 250, + PkScript: p2wkhScript, + }, + }, + packet: makePacket(&wire.TxOut{ + Value: 50, + PkScript: p2wkhScript, + }), + changeIndex: 0, + feeRate: chainfee.FeePerKwFloor, + maxFeeRatio: 0.85, + changeType: chanfunding.ExistingChangeAddress, + expectedUtxoIndexes: []int{0}, + expectChangeOutputIndex: 0, + expectedFee: calcFee(0, 1, 0, 1, 0), }, { name: "large existing p2tr input, fee estimation existing " + "change output", @@ -536,6 +620,7 @@ func TestFundPsbtCoinSelect(t *testing.T) { }), changeIndex: 0, feeRate: chainfee.FeePerKwFloor, + maxFeeRatio: chanfunding.DefaultMaxFeeRatio, changeType: chanfunding.ExistingChangeAddress, expectedUtxoIndexes: []int{}, expectChangeOutputIndex: 0, @@ -575,6 +660,7 @@ func TestFundPsbtCoinSelect(t *testing.T) { "", tc.changeIndex, copiedPacket, 0, tc.changeType, tc.feeRate, rpcServer.cfg.CoinSelectionStrategy, + tc.maxFeeRatio, ) switch { @@ -588,6 +674,12 @@ func TestFundPsbtCoinSelect(t *testing.T) { require.Error(tt, err) require.ErrorAs(tt, err, &tc.expectedErr) + return + case tc.expectedContainedErrStr != "": + require.ErrorContains( + tt, err, tc.expectedContainedErrStr, + ) + return } diff --git a/lnwallet/chanfunding/coin_select.go b/lnwallet/chanfunding/coin_select.go index e2c85c9d34..26fe9b92b1 100644 --- a/lnwallet/chanfunding/coin_select.go +++ b/lnwallet/chanfunding/coin_select.go @@ -58,6 +58,10 @@ const ( // must assert that the output value of the selected existing output // already is above dust when using this change address type. ExistingChangeAddress ChangeAddressType = 2 + + // DefaultMaxFeeRatio is the default fee to total amount of outputs + // ratio that is used to sanity check the fees of a transaction. + DefaultMaxFeeRatio float64 = 0.2 ) // selectInputs selects a slice of inputs necessary to meet the specified @@ -143,16 +147,25 @@ func calculateFees(utxos []wallet.Coin, feeRate chainfee.SatPerKWeight, return requiredFeeNoChange, requiredFeeWithChange, nil } -// sanityCheckFee checks if the specified fee amounts to over 20% of the total -// output amount and raises an error. -func sanityCheckFee(totalOut, fee btcutil.Amount) error { - // Fail if more than 20% goes to fees. - // TODO(halseth): smarter fee limit. Make configurable or dynamic wrt - // total funding size? - if fee > totalOut/5 { - return fmt.Errorf("fee (%v) exceeds 20%% of total output (%v)", - fee, totalOut) +// sanityCheckFee checks if the specified fee amounts to what the provided ratio +// allows. +func sanityCheckFee(totalOut, fee btcutil.Amount, maxFeeRatio float64) error { + // Sanity check the maxFeeRatio itself. + if maxFeeRatio <= 0.00 || maxFeeRatio > 1.00 { + return fmt.Errorf("maxFeeRatio must be between 0.00 and 1.00 "+ + "got %.2f", maxFeeRatio) + } + + maxFee := btcutil.Amount(float64(totalOut) * maxFeeRatio) + + // Check that the fees do not exceed the max allowed value. + if fee > maxFee { + return fmt.Errorf("fee %v exceeds max fee (%v) on total "+ + "output value %v with max fee ratio of %.2f", fee, + maxFee, totalOut, maxFeeRatio) } + + // All checks passed, we return nil to signal that the fees are valid. return nil } @@ -163,7 +176,8 @@ func sanityCheckFee(totalOut, fee btcutil.Amount) error { func CoinSelect(feeRate chainfee.SatPerKWeight, amt, dustLimit btcutil.Amount, coins []wallet.Coin, strategy wallet.CoinSelectionStrategy, existingWeight input.TxWeightEstimator, - changeType ChangeAddressType) ([]wallet.Coin, btcutil.Amount, error) { + changeType ChangeAddressType, maxFeeRatio float64) ([]wallet.Coin, + btcutil.Amount, error) { amtNeeded := amt for { @@ -188,6 +202,7 @@ func CoinSelect(feeRate chainfee.SatPerKWeight, amt, dustLimit btcutil.Amount, changeAmount, newAmtNeeded, err := CalculateChangeAmount( totalSat, amt, requiredFeeNoChange, requiredFeeWithChange, dustLimit, changeType, + maxFeeRatio, ) if err != nil { return nil, 0, err @@ -216,7 +231,8 @@ func CoinSelect(feeRate chainfee.SatPerKWeight, amt, dustLimit btcutil.Amount, // fees and that more coins need to be selected. func CalculateChangeAmount(totalInputAmt, requiredAmt, requiredFeeNoChange, requiredFeeWithChange, dustLimit btcutil.Amount, - changeType ChangeAddressType) (btcutil.Amount, btcutil.Amount, error) { + changeType ChangeAddressType, maxFeeRatio float64) (btcutil.Amount, + btcutil.Amount, error) { // This is just a sanity check to make sure the function is used // correctly. @@ -266,7 +282,8 @@ func CalculateChangeAmount(totalInputAmt, requiredAmt, requiredFeeNoChange, // Sanity check the resulting output values to make sure we // don't burn a great part to fees. totalOut := requiredAmt + changeAmt - err := sanityCheckFee(totalOut, totalInputAmt-totalOut) + + err := sanityCheckFee(totalOut, totalInputAmt-totalOut, maxFeeRatio) if err != nil { return 0, 0, err } @@ -280,9 +297,9 @@ func CalculateChangeAmount(totalInputAmt, requiredAmt, requiredFeeNoChange, func CoinSelectSubtractFees(feeRate chainfee.SatPerKWeight, amt, dustLimit btcutil.Amount, coins []wallet.Coin, strategy wallet.CoinSelectionStrategy, - existingWeight input.TxWeightEstimator, - changeType ChangeAddressType) ([]wallet.Coin, btcutil.Amount, - btcutil.Amount, error) { + existingWeight input.TxWeightEstimator, changeType ChangeAddressType, + maxFeeRatio float64) ([]wallet.Coin, btcutil.Amount, btcutil.Amount, + error) { // First perform an initial round of coin selection to estimate // the required fee. @@ -331,7 +348,7 @@ func CoinSelectSubtractFees(feeRate chainfee.SatPerKWeight, amt, // Sanity check the resulting output values to make sure we // don't burn a great part to fees. totalOut := outputAmt + changeAmt - err = sanityCheckFee(totalOut, totalSat-totalOut) + err = sanityCheckFee(totalOut, totalSat-totalOut, maxFeeRatio) if err != nil { return nil, 0, 0, err } @@ -347,8 +364,8 @@ func CoinSelectUpToAmount(feeRate chainfee.SatPerKWeight, minAmount, maxAmount, reserved, dustLimit btcutil.Amount, coins []wallet.Coin, strategy wallet.CoinSelectionStrategy, existingWeight input.TxWeightEstimator, - changeType ChangeAddressType) ([]wallet.Coin, btcutil.Amount, - btcutil.Amount, error) { + changeType ChangeAddressType, maxFeeRatio float64) ([]wallet.Coin, + btcutil.Amount, btcutil.Amount, error) { var ( // selectSubtractFee is tracking if our coin selection was @@ -369,7 +386,7 @@ func CoinSelectUpToAmount(feeRate chainfee.SatPerKWeight, minAmount, maxAmount, // maxAmount with or without a change output that covers the miner fee. selected, changeAmt, err := CoinSelect( feeRate, maxAmount, dustLimit, coins, strategy, existingWeight, - changeType, + changeType, maxFeeRatio, ) var errInsufficientFunds *ErrInsufficientFunds @@ -412,7 +429,7 @@ func CoinSelectUpToAmount(feeRate chainfee.SatPerKWeight, minAmount, maxAmount, if selectSubtractFee { selected, outputAmount, changeAmt, err = CoinSelectSubtractFees( feeRate, totalBalance-reserved, dustLimit, coins, - strategy, existingWeight, changeType, + strategy, existingWeight, changeType, maxFeeRatio, ) if err != nil { return nil, 0, 0, err @@ -430,7 +447,7 @@ func CoinSelectUpToAmount(feeRate chainfee.SatPerKWeight, minAmount, maxAmount, return sum } - err = sanityCheckFee(totalOut, sum(selected)-totalOut) + err = sanityCheckFee(totalOut, sum(selected)-totalOut, maxFeeRatio) if err != nil { return nil, 0, 0, err } diff --git a/lnwallet/chanfunding/coin_select_test.go b/lnwallet/chanfunding/coin_select_test.go index 3d09668b49..77c5a0e68a 100644 --- a/lnwallet/chanfunding/coin_select_test.go +++ b/lnwallet/chanfunding/coin_select_test.go @@ -317,6 +317,7 @@ func TestCoinSelect(t *testing.T) { feeRate, test.outputValue, dustLimit, test.coins, wallet.CoinSelectionLargest, fundingOutputEstimate, test.changeType, + DefaultMaxFeeRatio, ) if test.expectErr { @@ -356,6 +357,7 @@ func TestCalculateChangeAmount(t *testing.T) { feeWithChange btcutil.Amount dustLimit btcutil.Amount changeType ChangeAddressType + maxFeeRatio float64 expectErr string expectChangeAmt btcutil.Amount @@ -369,6 +371,7 @@ func TestCalculateChangeAmount(t *testing.T) { totalInputAmt: 500, requiredAmt: 490, feeNoChange: 12, + maxFeeRatio: DefaultMaxFeeRatio, expectNeedMore: 502, }, { @@ -383,6 +386,7 @@ func TestCalculateChangeAmount(t *testing.T) { feeWithChange: 10, dustLimit: 100, changeType: ExistingChangeAddress, + maxFeeRatio: DefaultMaxFeeRatio, expectChangeAmt: 90, }, { @@ -392,6 +396,7 @@ func TestCalculateChangeAmount(t *testing.T) { feeNoChange: 40, feeWithChange: 50, dustLimit: 100, + maxFeeRatio: DefaultMaxFeeRatio, expectChangeAmt: 150, }, { @@ -401,6 +406,7 @@ func TestCalculateChangeAmount(t *testing.T) { requiredAmt: 460, feeNoChange: 40, feeWithChange: 50, + maxFeeRatio: DefaultMaxFeeRatio, expectChangeAmt: 0, }, { @@ -410,14 +416,36 @@ func TestCalculateChangeAmount(t *testing.T) { feeNoChange: 10, feeWithChange: 45, dustLimit: 5, + maxFeeRatio: DefaultMaxFeeRatio, - expectErr: "fee (0.00000045 BTC) exceeds 20% of total output " + - "(0.00000055 BTC)", + expectErr: "fee 0.00000045 BTC exceeds max fee (0.00000011 " + + "BTC) on total output value 0.00000055 BTC", + }, { + name: "fee percent ok", + totalInputAmt: 100, + requiredAmt: 50, + feeNoChange: 10, + feeWithChange: 45, + dustLimit: 5, + maxFeeRatio: 0.95, + + expectChangeAmt: 5, + }, { + name: "invalid max fee ratio", + totalInputAmt: 100, + requiredAmt: 50, + feeNoChange: 10, + feeWithChange: 45, + dustLimit: 5, + maxFeeRatio: 3.14, + + expectErr: "maxFeeRatio must be between 0.00 and 1.00", }, { name: "invalid usage of function", feeNoChange: 5, feeWithChange: 10, changeType: ExistingChangeAddress, + maxFeeRatio: DefaultMaxFeeRatio, expectErr: "fees for with or without change must be the same", }} @@ -428,7 +456,7 @@ func TestCalculateChangeAmount(t *testing.T) { changeAmt, needMore, err := CalculateChangeAmount( tc.totalInputAmt, tc.requiredAmt, tc.feeNoChange, tc.feeWithChange, tc.dustLimit, - tc.changeType, + tc.changeType, tc.maxFeeRatio, ) if tc.expectErr != "" { @@ -606,8 +634,9 @@ func TestCoinSelectSubtractFees(t *testing.T) { }, spendValue: 5 * fundingFee(highFeeRate, 1, false), - expectErr: "fee ( BTC) exceeds % of total " + - "output ( BTC)", + expectErr: "fee BTC exceeds max fee ( " + + "BTC) on total output value BTC with " + + "max fee ratio of ", }, } @@ -628,6 +657,7 @@ func TestCoinSelectSubtractFees(t *testing.T) { wallet.CoinSelectionLargest, fundingOutputEstimate, defaultChanFundingChangeType, + DefaultMaxFeeRatio, ) if err != nil { switch { @@ -813,8 +843,9 @@ func TestCoinSelectUpToAmount(t *testing.T) { minValue: minValue, maxValue: 16 * fundingFee(feeRate, 1, false), - expectErr: "fee (0.00000192 BTC) exceeds 20% of total output " + - "(0.00000768 BTC)", + expectErr: "fee 0.00000192 BTC exceeds max fee (0.00000153 " + + "BTC) on total output value 0.00000768 BTC with max " + + "fee ratio of 0.20", }, { // This test makes sure that the implementation detail of using // CoinSelect and CoinSelectSubtractFees is done correctly. @@ -873,6 +904,7 @@ func TestCoinSelectUpToAmount(t *testing.T) { wallet.CoinSelectionLargest, fundingOutputEstimate, defaultChanFundingChangeType, + DefaultMaxFeeRatio, ) if len(test.expectErr) == 0 && err != nil { t.Fatal(err.Error()) diff --git a/lnwallet/chanfunding/wallet_assembler.go b/lnwallet/chanfunding/wallet_assembler.go index 3d62649cb4..ce2b406c68 100644 --- a/lnwallet/chanfunding/wallet_assembler.go +++ b/lnwallet/chanfunding/wallet_assembler.go @@ -436,6 +436,7 @@ func (w *WalletAssembler) ProvisionChannel(r *Request) (Intent, error) { reserve, w.cfg.DustLimit, coins, w.cfg.CoinSelectionStrategy, fundingOutputWeight, changeType, + DefaultMaxFeeRatio, ) if err != nil { return err @@ -471,6 +472,7 @@ func (w *WalletAssembler) ProvisionChannel(r *Request) (Intent, error) { r.FeeRate, r.LocalAmt, dustLimit, coins, w.cfg.CoinSelectionStrategy, fundingOutputWeight, changeType, + DefaultMaxFeeRatio, ) if err != nil { return err @@ -485,6 +487,7 @@ func (w *WalletAssembler) ProvisionChannel(r *Request) (Intent, error) { r.FeeRate, r.LocalAmt, dustLimit, coins, w.cfg.CoinSelectionStrategy, fundingOutputWeight, changeType, + DefaultMaxFeeRatio, ) if err != nil { return err