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Merge pull request #23 from OasisDEX:jt/sc-14562/lib-create-strategie…
…s-for-new-operations ✨ feat(with ops): create strategies for new withdraw-to-ltv operations for auto
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159
packages/dma-library/src/strategies/aave/auto/withdraw-to-ltv/index.ts
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,159 @@ | ||
| import { ONE, ZERO } from "@dma-common/constants"; | ||
| import { withdraw as withdrawOp } from '@dma-library/operations/aave/auto/withdraw' | ||
| import { withdrawToDebt } from '@dma-library/operations/aave/auto/withdraw-to-debt' | ||
| import { getAaveTokenAddress } from '@dma-library/strategies/aave/common' | ||
| import { AaveLikeTokens } from '@dma-library/types' | ||
| import { WithV3Protocol } from '@dma-library/types/aave/protocol' | ||
| import * as Strategies from '@dma-library/types/strategies' | ||
| import * as StrategyParams from '@dma-library/types/strategy-params' | ||
| import { getSwapDataHelper } from '@dma-library/utils/swap' | ||
| import { PositionBalance } from '@domain' | ||
| import BigNumber from 'bignumber.js' | ||
|
|
||
| export type AaveV3WithdrawArgs = { | ||
| oraclePrice: BigNumber | ||
| targetLTV: BigNumber | ||
| slippage: BigNumber | ||
| shouldWithdrawToDebt: boolean | ||
| } | ||
|
|
||
| export type AaveV3WithdrawDependencies = Omit< | ||
| StrategyParams.WithAaveLikeStrategyDependencies, | ||
| 'protocolType' | ||
| > & | ||
| StrategyParams.WithGetSwap & | ||
| WithV3Protocol | ||
|
|
||
| export type WithdrawToLTVStrategy = Omit<Strategies.IStrategy, 'simulation'> | ||
|
|
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| export type AaveV3WithdrawToLTV = ( | ||
| args: AaveV3WithdrawArgs, | ||
| dependencies: Omit<AaveV3WithdrawDependencies, 'protocol'>, | ||
| ) => Promise<WithdrawToLTVStrategy> | ||
|
|
||
| export const withdraw: AaveV3WithdrawToLTV = async (args, dependencies) => { | ||
| const currentPosition = dependencies.currentPosition | ||
|
|
||
| const amountToWithdraw = determineWithdrawalAmount( | ||
| currentPosition.debt, | ||
| currentPosition.collateral, | ||
| args.targetLTV, | ||
| args.oraclePrice, | ||
| ) | ||
|
|
||
| const collateralTokenSymbol = currentPosition.collateral.symbol | ||
| const debtTokenSymbol = currentPosition.debt.symbol | ||
|
|
||
| if (args.shouldWithdrawToDebt) { | ||
| const FEE = new BigNumber(20) | ||
| const FEE_BASIS = new BigNumber(10000) | ||
| const feeAmount = amountToWithdraw.times(FEE.div(FEE_BASIS)).integerValue(BigNumber.ROUND_FLOOR); | ||
| const amountToSwap = amountToWithdraw.minus(feeAmount) | ||
| const { swapData } = await getSwapDataHelper<typeof dependencies.addresses, AaveLikeTokens>({ | ||
| args: { | ||
| fromToken: { symbol: collateralTokenSymbol as AaveLikeTokens }, | ||
| toToken: { symbol: debtTokenSymbol as AaveLikeTokens }, | ||
| slippage: args.slippage, | ||
| fee: ZERO, | ||
| // Before fees here refers to fees collected by the Swap contract | ||
| // not by CollectFee.sol | ||
| swapAmountBeforeFees: amountToSwap, | ||
| }, | ||
| addresses: dependencies.addresses, | ||
| services: { | ||
| getSwapData: dependencies.getSwapData, | ||
| getTokenAddress: getAaveTokenAddress, | ||
| }, | ||
| }) | ||
|
|
||
| const operation = await withdrawToDebt({ | ||
| withdrawAmount: amountToWithdraw, | ||
| collateralTokenAddress: getTokenAddressFromDependencies( | ||
| dependencies, | ||
| currentPosition.collateral.symbol, | ||
| ), | ||
| receiveAtLeast: swapData.minToTokenAmount, | ||
| swapAmount: amountToSwap, | ||
| swapData: `${swapData.exchangeCalldata}`, | ||
| debtTokenAddress: getTokenAddressFromDependencies(dependencies, debtTokenSymbol), | ||
| debtIsEth: debtTokenSymbol === 'WETH', | ||
| proxy: dependencies.proxy, | ||
| addresses: dependencies.addresses, | ||
| network: dependencies.network, | ||
| }) | ||
|
|
||
| return { | ||
| transaction: { | ||
| calls: operation.calls, | ||
| operationName: operation.operationName, | ||
| }, | ||
| } | ||
| } | ||
|
|
||
| if (!args.shouldWithdrawToDebt) { | ||
| const operation = await withdrawOp({ | ||
| withdrawAmount: amountToWithdraw, | ||
| collateralTokenAddress: getTokenAddressFromDependencies( | ||
| dependencies, | ||
| currentPosition.collateral.symbol, | ||
| ), | ||
| collateralIsEth: collateralTokenSymbol === 'WETH', | ||
| proxy: dependencies.proxy, | ||
| addresses: dependencies.addresses, | ||
| network: dependencies.network, | ||
| }) | ||
|
|
||
| return { | ||
| transaction: { | ||
| calls: operation.calls, | ||
| operationName: operation.operationName, | ||
| }, | ||
| } | ||
| } | ||
|
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||
| throw new Error('Should not be reached') | ||
| } | ||
|
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||
| function determineWithdrawalAmount( | ||
| existingDebt: PositionBalance, | ||
| existingCollateral: PositionBalance, | ||
| targetLTV: BigNumber, | ||
| oraclePrice: BigNumber, | ||
| ) { | ||
| const COLLATERAL_PRECISION = existingCollateral.precision | ||
| const DEBT_PRECISION = existingDebt.precision | ||
|
|
||
| // We scale down because BigNumber can handle precision maths | ||
| // with large floating point numbers | ||
| const scaledDownDebt = existingDebt.amount.div(new BigNumber(10).pow(DEBT_PRECISION)) | ||
|
|
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| // nextCollateral = existingDebt / (targetLTV * oraclePrice) | ||
| const scaledDownNextCollateral = scaledDownDebt.div(targetLTV.times(oraclePrice)) | ||
| const nextCollateral = scaledDownNextCollateral.multipliedBy( | ||
| new BigNumber(10).pow(COLLATERAL_PRECISION), | ||
| ) | ||
| const amountToWithdraw = existingCollateral.amount.minus(nextCollateral) | ||
|
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||
| if (amountToWithdraw.lte(ZERO)) { | ||
| console.debug('next-collateral', nextCollateral.toString()) | ||
| console.debug('amount-to-withdraw', amountToWithdraw.toString()) | ||
| throw new Error('Cannot withdraw zero or less') | ||
| } | ||
|
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| return amountToWithdraw | ||
| } | ||
|
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| function getTokenAddressFromDependencies( | ||
| deps: Omit<AaveV3WithdrawDependencies, 'protocol'>, | ||
| symbol: string, | ||
| ) { | ||
| const address = deps.addresses.tokens[symbol] | ||
|
|
||
| if (!address) { | ||
| console.debug('symbol:', symbol) | ||
| console.debug('tokens:', deps.addresses.tokens) | ||
| throw new Error('Could not get address from position token symbol') | ||
| } | ||
|
|
||
| return address | ||
| } |
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