90 lines
3.3 KiB
Go
90 lines
3.3 KiB
Go
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package aave
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import (
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"context"
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"math/big"
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"git.lehouerou.net/laurent/evm"
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"git.lehouerou.net/laurent/evm/aave/contracts"
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"github.com/ethereum/go-ethereum/accounts/abi/bind"
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"github.com/ethereum/go-ethereum/common"
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"github.com/ethereum/go-ethereum/core/types"
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"github.com/pkg/errors"
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"github.com/shopspring/decimal"
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)
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type LendingPool struct {
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client evm.Client
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contract *contracts.LendingPool
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}
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func NewLendingPool(client evm.Client, address common.Address) (*LendingPool, error) {
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contract, err := contracts.NewLendingPool(address, client)
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if err != nil {
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return nil, errors.Wrap(err, "init contract")
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}
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return &LendingPool{
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client: client,
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contract: contract,
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}, nil
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}
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type UserAccountData struct {
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TotalCollateralETH decimal.Decimal
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TotalDebtETH decimal.Decimal
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AvailableBorrowsETH decimal.Decimal
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CurrentLiquidationThreshold decimal.Decimal
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CurrentLtv decimal.Decimal
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MaxLtv decimal.Decimal
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HealthFactor decimal.Decimal
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}
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func (uad UserAccountData) BorrowAmountToLtv(ltv decimal.Decimal) decimal.Decimal {
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return uad.TotalCollateralETH.Mul(ltv).Div(decimal.NewFromInt(100)).Sub(uad.TotalDebtETH)
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}
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func (lp *LendingPool) UserAccountDataForAddress(address common.Address) (UserAccountData, error) {
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uad, err := lp.contract.GetUserAccountData(&bind.CallOpts{}, address)
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if err != nil {
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return UserAccountData{}, errors.Wrap(err, "calling contract")
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}
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res := UserAccountData{
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TotalCollateralETH: decimal.NewFromBigInt(uad.TotalCollateralETH, -8),
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TotalDebtETH: decimal.NewFromBigInt(uad.TotalDebtETH, -8),
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AvailableBorrowsETH: decimal.NewFromBigInt(uad.AvailableBorrowsETH, -8),
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CurrentLiquidationThreshold: decimal.NewFromBigInt(uad.CurrentLiquidationThreshold, -2),
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MaxLtv: decimal.NewFromBigInt(uad.Ltv, -2),
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HealthFactor: decimal.NewFromBigInt(uad.HealthFactor, -18),
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}
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res.CurrentLtv = res.TotalDebtETH.Div(res.TotalCollateralETH).Mul(decimal.NewFromInt(100))
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return res, nil
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}
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func (lp *LendingPool) Borrow(ctx context.Context, asset common.Address, amount decimal.Decimal) (evm.Transaction, error) {
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token, err := lp.client.TokenService().TokenByAddress(asset)
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if err != nil {
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return nil, errors.Wrap(err, "getting token")
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}
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return lp.client.Execute(ctx, func(ctx context.Context, opts *evm.TransactOpts) (*types.Transaction, error) {
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return lp.contract.Borrow(opts.TransactOpts, asset, token.ValueToBigInt(amount), big.NewInt(2), 0, lp.client.PublicAddress())
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})
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}
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func (lp *LendingPool) Repay(ctx context.Context, asset common.Address, amount decimal.Decimal) (evm.Transaction, error) {
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token, err := lp.client.TokenService().TokenByAddress(asset)
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if err != nil {
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return nil, errors.Wrap(err, "getting token")
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}
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balance, err := token.Balance()
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if err != nil {
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return nil, errors.Wrap(err, "getting token balance")
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}
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if balance.LessThan(amount) {
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return nil, errors.Wrapf(err, "balance of %s insufficient. need %s have %s", token.Symbol(), amount, balance)
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}
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return lp.client.Execute(ctx, func(ctx context.Context, opts *evm.TransactOpts) (*types.Transaction, error) {
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return lp.contract.Repay(opts.TransactOpts, asset, token.ValueToBigInt(amount), big.NewInt(2), lp.client.PublicAddress())
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})
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}
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