Contract Source Code (Vyper language format)

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# @version 0.2.12
# @author skozin <info@lido.fi>
# @licence MIT
from vyper.interfaces import ERC20


interface ERC20Decimals:
    def decimals() -> uint256: view


interface LidoStethOracle:
    def stethPrice() -> uint256: view


interface ChainlinkAggregatorV3Interface:
    def decimals() -> uint256: view
    # (roundId: uint80, answer: int256, startedAt: uint256, updatedAt: uint256, answeredInRound: uint80)
    def latestRoundData() -> (uint256, int256, uint256, uint256, uint256): view


interface CurveStableSwap:
    def get_dy(i: int128, j: int128, dx: uint256) -> uint256: view
    def exchange(i: int128, j: int128, dx: uint256, min_dy: uint256) -> uint256: payable


event SoldStethToUST:
    steth_amount: uint256
    eth_amount: uint256
    ust_amount: uint256
    steth_anchor_price: uint256
    ust_anchor_price: uint256


event AdminChanged:
    new_admin: address


event PriceDifferenceChanged:
    max_steth_price_difference_percent: uint256
    max_eth_price_difference_percent: uint256


UST_TOKEN: constant(address) = 0xa47c8bf37f92aBed4A126BDA807A7b7498661acD
STETH_TOKEN: constant(address) = 0xae7ab96520DE3A18E5e111B5EaAb095312D7fE84
WETH_TOKEN: constant(address) = 0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2

LIDO_STETH_ETH_ORACLE: constant(address) = 0x3A6Bd15abf19581e411621D669B6a2bbe741ffD6
CHAINLINK_ETH_USD_FEED: constant(address) = 0x5f4eC3Df9cbd43714FE2740f5E3616155c5b8419

CURVE_STETH_POOL: constant(address) = 0xDC24316b9AE028F1497c275EB9192a3Ea0f67022
SUSHISWAP_ROUTER_V2: constant(address) = 0xd9e1cE17f2641f24aE83637ab66a2cca9C378B9F

CURVE_ETH_INDEX: constant(uint256) = 0
CURVE_STETH_INDEX: constant(uint256) = 1

SUSHISWAP_EXCH_PATH: constant(address[2]) = [WETH_TOKEN, UST_TOKEN]


# An address that is allowed to configure the liquidator settings.
admin: public(address)

# An address that is allowed to sell.
vault: public(address)

# Maximum difference (in percents multiplied by 10**18) between the resulting
# ETH/UST price and the ETH/USD anchor price obtained from the oracle.
max_eth_price_difference_percent: public(uint256)

# Maximum difference (in percents multiplied by 10**18) between the resulting
# stETH/ETH price and the stETH/ETH anchor price obtained from the oracle.
max_steth_price_difference_percent: public(uint256)


@external
def __init__(
    vault: address,
    admin: address,
    max_steth_price_difference_percent: uint256,
    max_eth_price_difference_percent: uint256
):
    assert ERC20Decimals(UST_TOKEN).decimals() == 18
    assert ERC20Decimals(STETH_TOKEN).decimals() == 18

    assert max_steth_price_difference_percent <= 10**18, "invalid percentage"
    assert max_eth_price_difference_percent <= 10**18, "invalid percentage"

    self.vault = vault
    self.admin = admin
    self.max_steth_price_difference_percent = max_steth_price_difference_percent
    self.max_eth_price_difference_percent = max_eth_price_difference_percent

    log AdminChanged(self.admin)

    log PriceDifferenceChanged(
        self.max_steth_price_difference_percent, 
        self.max_eth_price_difference_percent
    )


@external
@payable
def __default__():
    pass


@external
def change_admin(new_admin: address):
    assert msg.sender == self.admin
    self.admin = new_admin
    log AdminChanged(self.admin)


@external
def configure(
    max_steth_price_difference_percent: uint256,
    max_eth_price_difference_percent: uint256
):
    assert msg.sender == self.admin
    assert max_steth_price_difference_percent <= 10**18, "invalid percentage"
    assert max_eth_price_difference_percent <= 10**18, "invalid percentage"

    self.max_steth_price_difference_percent = max_steth_price_difference_percent
    self.max_eth_price_difference_percent = max_eth_price_difference_percent

    log PriceDifferenceChanged(
        self.max_steth_price_difference_percent, 
        self.max_eth_price_difference_percent
    )


@internal
@view
def _get_steth_anchor_price() -> uint256:
    return LidoStethOracle(LIDO_STETH_ETH_ORACLE).stethPrice()


@internal
@view
def _get_eth_anchor_price() -> uint256:
    eth_price_decimals: uint256 = ChainlinkAggregatorV3Interface(CHAINLINK_ETH_USD_FEED).decimals()
    assert 0 < eth_price_decimals and eth_price_decimals <= 18

    round_id: uint256 = 0
    answer: int256 = 0
    started_at: uint256 = 0
    updated_at: uint256 = 0
    answered_in_round: uint256 = 0

    (round_id, answer, started_at, updated_at, answered_in_round) = \
        ChainlinkAggregatorV3Interface(CHAINLINK_ETH_USD_FEED).latestRoundData()

    assert updated_at != 0

    return convert(answer, uint256) * (10 ** (18 - eth_price_decimals))


@internal
def _sushi_sell_eth_to_ust(
    eth_amount_in: uint256,
    ust_amount_out_min: uint256,
    ust_recipient: address
) -> uint256:
    result: Bytes[128] = raw_call(
        SUSHISWAP_ROUTER_V2,
        concat(
            # uint256 amountOutMin, address[] calldata path, address to, uint256 deadline
            method_id("swapExactETHForTokens(uint256,address[],address,uint256)"),
            convert(ust_amount_out_min, bytes32),
            convert(128, bytes32),
            convert(ust_recipient, bytes32),
            convert(MAX_UINT256, bytes32),
            convert(2, bytes32),
            convert(WETH_TOKEN, bytes32),
            convert(UST_TOKEN, bytes32)
        ),
        value=eth_amount_in,
        max_outsize=128
    )
    # The return type is uint256[] and the actual length of the array is 2, so the
    # layout of the data is (pad32(64) . pad32(2) . pad32(arr[0]) . pad32(arr[1])).
    # We need the second array item, thus the byte offset is 96.
    return convert(extract32(result, 96), uint256)


@internal
@pure
def _get_min_amount_out(amount_in: uint256, price: uint256, max_diff_percent: uint256) -> uint256:
    amount_out: uint256 = (amount_in * price) / 10**18
    min_mult: uint256 = 10**18 - max_diff_percent
    return (amount_out * min_mult) / 10**18


@external
def liquidate(ust_recipient: address) -> uint256:
    assert msg.sender == self.vault, "unauthorized"

    steth_amount: uint256 = ERC20(STETH_TOKEN).balanceOf(self)
    assert steth_amount > 0, "zero stETH balance"

    steth_anchor_price: uint256 = self._get_steth_anchor_price()

    min_eth_amount: uint256 = self._get_min_amount_out(
        steth_amount,
        steth_anchor_price,
        self.max_steth_price_difference_percent
    )

    ERC20(STETH_TOKEN).approve(CURVE_STETH_POOL, steth_amount)

    eth_amount: uint256 = CurveStableSwap(CURVE_STETH_POOL).exchange(
        CURVE_STETH_INDEX,
        CURVE_ETH_INDEX,
        steth_amount,
        min_eth_amount
    )

    assert eth_amount >= min_eth_amount, "insuff. ETH return"
    assert self.balance >= eth_amount

    eth_anchor_price: uint256 = self._get_eth_anchor_price()

    min_ust_amount: uint256 = self._get_min_amount_out(
        eth_amount,
        eth_anchor_price,
        self.max_eth_price_difference_percent
    )

    ust_amount_actual: uint256 = self._sushi_sell_eth_to_ust(
        eth_amount,
        min_ust_amount,
        ust_recipient
    )

    assert ust_amount_actual >= min_ust_amount, "insuff. UST return"

    log SoldStethToUST(
        steth_amount,
        eth_amount,
        ust_amount_actual,
        steth_anchor_price,
        eth_anchor_price
    )

    return ust_amount_actual

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[{"name":"SoldStethToUST","inputs":[{"name":"steth_amount","type":"uint256","indexed":false},{"name":"eth_amount","type":"uint256","indexed":false},{"name":"ust_amount","type":"uint256","indexed":false},{"name":"steth_anchor_price","type":"uint256","indexed":false},{"name":"ust_anchor_price","type":"uint256","indexed":false}],"anonymous":false,"type":"event"},{"name":"AdminChanged","inputs":[{"name":"new_admin","type":"address","indexed":false}],"anonymous":false,"type":"event"},{"name":"PriceDifferenceChanged","inputs":[{"name":"max_steth_price_difference_percent","type":"uint256","indexed":false},{"name":"max_eth_price_difference_percent","type":"uint256","indexed":false}],"anonymous":false,"type":"event"},{"stateMutability":"nonpayable","type":"constructor","inputs":[{"name":"vault","type":"address"},{"name":"admin","type":"address"},{"name":"max_steth_price_difference_percent","type":"uint256"},{"name":"max_eth_price_difference_percent","type":"uint256"}],"outputs":[]},{"stateMutability":"payable","type":"fallback"},{"stateMutability":"nonpayable","type":"function","name":"change_admin","inputs":[{"name":"new_admin","type":"address"}],"outputs":[],"gas":41082},{"stateMutability":"nonpayable","type":"function","name":"configure","inputs":[{"name":"max_steth_price_difference_percent","type":"uint256"},{"name":"max_eth_price_difference_percent","type":"uint256"}],"outputs":[],"gas":78954},{"stateMutability":"nonpayable","type":"function","name":"liquidate","inputs":[{"name":"ust_recipient","type":"address"}],"outputs":[{"name":"","type":"uint256"}],"gas":75737},{"stateMutability":"view","type":"function","name":"admin","inputs":[],"outputs":[{"name":"","type":"address"}],"gas":2568},{"stateMutability":"view","type":"function","name":"vault","inputs":[],"outputs":[{"name":"","type":"address"}],"gas":2598},{"stateMutability":"view","type":"function","name":"max_eth_price_difference_percent","inputs":[],"outputs":[{"name":"","type":"uint256"}],"gas":2628},{"stateMutability":"view","type":"function","name":"max_steth_price_difference_percent","inputs":[],"outputs":[{"name":"","type":"uint256"}],"gas":2658}]

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000000000000000000000000a2f987a546d4cd1c607ee8141276876c26b72bdf0000000000000000000000003cd9f71f80ab08ea5a7dca348b5e94bc595f26a000000000000000000000000000000000000000000000000000ba8478cab54000000000000000000000000000000000000000000000000000002386f26fc10000

-----Decoded View---------------
Arg [0] : vault (address): 0xA2F987A546D4CD1c607Ee8141276876C26b72Bdf
Arg [1] : admin (address): 0x3cd9F71F80AB08ea5a7Dca348B5e94BC595f26A0
Arg [2] : max_steth_price_difference_percent (uint256): 52500000000000000
Arg [3] : max_eth_price_difference_percent (uint256): 10000000000000000

-----Encoded View---------------
4 Constructor Arguments found :
Arg [0] : 000000000000000000000000a2f987a546d4cd1c607ee8141276876c26b72bdf
Arg [1] : 0000000000000000000000003cd9f71f80ab08ea5a7dca348b5e94bc595f26a0
Arg [2] : 00000000000000000000000000000000000000000000000000ba8478cab54000
Arg [3] : 000000000000000000000000000000000000000000000000002386f26fc10000