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fix(transfer): update liquidity policy
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,90 @@ | ||
| import { useAppSelector } from './redux'; | ||
| import { onChainBalanceSelector } from '../store/reselect/wallet'; | ||
| import { blocktankInfoSelector } from '../store/reselect/blocktank'; | ||
| import { blocktankChannelsSizeSelector } from '../store/reselect/lightning'; | ||
| import { fiatToBitcoinUnit } from '../utils/conversion'; | ||
|
|
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| type TTransferValues = { | ||
| maxClientBalance: number; | ||
| defaultLspBalance: number; | ||
| minLspBalance: number; | ||
| maxLspBalance: number; | ||
| }; | ||
|
|
||
| const getDefaultLspBalance = ( | ||
| clientBalance: number, | ||
| maxLspBalance: number, | ||
| ): number => { | ||
| const threshold1 = fiatToBitcoinUnit({ amount: 225, currency: 'EUR' }); | ||
| const threshold2 = fiatToBitcoinUnit({ amount: 495, currency: 'EUR' }); | ||
| const defaultLspBalance = fiatToBitcoinUnit({ amount: 450, currency: 'EUR' }); | ||
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| let lspBalance = defaultLspBalance - clientBalance; | ||
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|
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| if (clientBalance > threshold1) { | ||
| lspBalance = clientBalance; | ||
| } | ||
|
|
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| if (clientBalance > threshold2) { | ||
| lspBalance = maxLspBalance; | ||
| } | ||
|
|
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| return Math.min(lspBalance, maxLspBalance); | ||
| }; | ||
|
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| const getMinLspBalance = ( | ||
| clientBalance: number, | ||
| minChannelSize: number, | ||
| ): number => { | ||
| // LSP balance must be at least 2% of the channel size for LDK to accept (reserve balance) | ||
| const ldkMinimum = Math.round(clientBalance * 0.02); | ||
| // Channel size must be at least minChannelSize | ||
| const lspMinimum = Math.max(minChannelSize - clientBalance, 0); | ||
|
|
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| return Math.max(ldkMinimum, lspMinimum); | ||
| }; | ||
|
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| const getMaxClientBalance = ( | ||
| onchainBalance: number, | ||
| maxChannelSize: number, | ||
| ): number => { | ||
| // Remote balance must be at least 2% of the channel size for LDK to accept (reserve balance) | ||
| const minRemoteBalance = Math.round(maxChannelSize * 0.02); | ||
| // Cap client balance to 80% to leave buffer for fees | ||
| const feeMaximum = Math.round(onchainBalance * 0.8); | ||
| const ldkMaximum = maxChannelSize - minRemoteBalance; | ||
|
|
||
| return Math.min(feeMaximum, ldkMaximum); | ||
| }; | ||
|
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| /** | ||
| * Returns limits and default values for channel orders with the LSP | ||
| * @param {number} clientBalance | ||
| * @returns {TTransferValues} | ||
| */ | ||
| export const useTransfer = (clientBalance: number): TTransferValues => { | ||
| const blocktankInfo = useAppSelector(blocktankInfoSelector); | ||
| const onchainBalance = useAppSelector(onChainBalanceSelector); | ||
| const channelsSize = useAppSelector(blocktankChannelsSizeSelector); | ||
|
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| const { minChannelSizeSat, maxChannelSizeSat } = blocktankInfo.options; | ||
|
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| // Because LSP limits constantly change depending on network fees | ||
| // add a 2% buffer to avoid fluctuations while making the order | ||
| const maxChannelSize1 = Math.round(maxChannelSizeSat * 0.98); | ||
| // The maximum channel size the user can open including existing channels | ||
| const maxChannelSize2 = Math.max(0, maxChannelSize1 - channelsSize); | ||
| const maxChannelSize = Math.min(maxChannelSize1, maxChannelSize2); | ||
|
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| const minLspBalance = getMinLspBalance(clientBalance, minChannelSizeSat); | ||
| const maxLspBalance = maxChannelSize - clientBalance; | ||
| const defaultLspBalance = getDefaultLspBalance(clientBalance, maxLspBalance); | ||
| const maxClientBalance = getMaxClientBalance(onchainBalance, maxChannelSize); | ||
|
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||
| return { | ||
| defaultLspBalance, | ||
| minLspBalance, | ||
| maxLspBalance, | ||
| maxClientBalance, | ||
| }; | ||
| }; |
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