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https://github.com/lightningnetwork/lnd.git
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7dfe4018ce
This commit was previously split into the following parts to ease review: - 2d746f68: replace imports - 4008f0fd: use ecdsa.Signature - 849e33d1: remove btcec.S256() - b8f6ebbd: use v2 library correctly - fa80bca9: bump go modules
83 lines
2.6 KiB
Go
83 lines
2.6 KiB
Go
package lnwallet
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import (
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"github.com/btcsuite/btcd/btcutil"
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"github.com/btcsuite/btcd/mempool"
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"github.com/btcsuite/btcd/wire"
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"github.com/lightningnetwork/lnd/input"
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"github.com/lightningnetwork/lnd/lnwire"
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)
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var (
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// RoutingFee100PercentUpTo is the cut-off amount we allow 100% fees to
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// be charged up to.
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RoutingFee100PercentUpTo = lnwire.NewMSatFromSatoshis(1_000)
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)
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const (
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// DefaultRoutingFeePercentage is the default off-chain routing fee we
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// allow to be charged for a payment over the RoutingFee100PercentUpTo
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// size.
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DefaultRoutingFeePercentage lnwire.MilliSatoshi = 5
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)
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// DefaultRoutingFeeLimitForAmount returns the default off-chain routing fee
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// limit lnd uses if the user does not specify a limit manually. The fee is
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// amount dependent because of the base routing fee that is set on many
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// channels. For example the default base fee is 1 satoshi. So sending a payment
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// of one satoshi will cost 1 satoshi in fees over most channels, which comes to
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// a fee of 100%. That's why for very small amounts we allow 100% fee.
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func DefaultRoutingFeeLimitForAmount(a lnwire.MilliSatoshi) lnwire.MilliSatoshi {
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// Allow 100% fees up to a certain amount to accommodate for base fees.
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if a <= RoutingFee100PercentUpTo {
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return a
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}
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// Everything larger than the cut-off amount will get a default fee
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// percentage.
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return a * DefaultRoutingFeePercentage / 100
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}
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// DustLimitForSize retrieves the dust limit for a given pkscript size. Given
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// the size, it automatically determines whether the script is a witness script
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// or not. It calls btcd's GetDustThreshold method under the hood. It must be
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// called with a proper size parameter or else a panic occurs.
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func DustLimitForSize(scriptSize int) btcutil.Amount {
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var (
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dustlimit btcutil.Amount
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pkscript []byte
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)
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// With the size of the script, determine which type of pkscript to
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// create. This will be used in the call to GetDustThreshold. We pass
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// in an empty byte slice since the contents of the script itself don't
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// matter.
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switch scriptSize {
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case input.P2WPKHSize:
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pkscript, _ = input.WitnessPubKeyHash([]byte{})
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case input.P2WSHSize:
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pkscript, _ = input.WitnessScriptHash([]byte{})
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case input.P2SHSize:
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pkscript, _ = input.GenerateP2SH([]byte{})
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case input.P2PKHSize:
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pkscript, _ = input.GenerateP2PKH([]byte{})
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case input.UnknownWitnessSize:
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pkscript, _ = input.GenerateUnknownWitness()
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default:
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panic("invalid script size")
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}
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// Call GetDustThreshold with a TxOut containing the generated
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// pkscript.
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txout := &wire.TxOut{PkScript: pkscript}
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dustlimit = btcutil.Amount(mempool.GetDustThreshold(txout))
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return dustlimit
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}
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