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Contract Source Code (Vyper language format)

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# @version 0.2.12

"""
@title Unagii Vault V2 0.1.1
@author stakewith.us
@license AGPL-3.0-or-later
"""

from vyper.interfaces import ERC20


interface DetailedERC20:
    def decimals() -> uint256: view


interface UnagiiToken:
    def minter() -> address: view
    def token() -> address: view
    def decimals() -> uint256: view
    def totalSupply() -> uint256: view
    def balanceOf(owner: address) -> uint256: view
    def mint(receiver: address, amount: uint256): nonpayable
    def burn(spender: address, amount: uint256): nonpayable
    def lastBlock(owner: address) -> uint256: view


# used for migrating to new Vault contract
interface Vault:
    def oldVault() -> address: view
    def token() -> address: view
    def uToken() -> address: view
    def fundManager() -> address: view
    def initialize(): nonpayable
    def balanceOfVault() -> uint256: view
    def debt() -> uint256: view
    def lockedProfit() -> uint256: view
    def lastReport() -> uint256: view


interface FundManager:
    def vault() -> address: view
    def token() -> address: view
    # returns loss = debt - total assets in fund manager
    def withdraw(amount: uint256) -> uint256: nonpayable


event Migrate:
    vault: address
    balanceOfVault: uint256
    debt: uint256
    lockedProfit: uint256


event SetNextTimeLock:
    nextTimeLock: address


event AcceptTimeLock:
    timeLock: address


event SetGuardian:
    guardian: address


event SetAdmin:
    admin: address


event SetFundManager:
    fundManager: address


event SetPause:
    paused: bool


event SetWhitelist:
    addr: indexed(address)
    approved: bool


event Deposit:
    sender: indexed(address)
    amount: uint256
    diff: uint256
    shares: uint256


event Withdraw:
    owner: indexed(address)
    shares: uint256
    amount: uint256


event Borrow:
    fundManager: indexed(address)
    amount: uint256
    borrowed: uint256


event Repay:
    fundManager: indexed(address)
    amount: uint256
    repaid: uint256


event Report:
    fundManager: indexed(address)
    balanceOfVault: uint256
    debt: uint256
    gain: uint256
    loss: uint256
    diff: uint256
    lockedProfit: uint256


event ForceUpdateBalanceOfVault:
    balanceOfVault: uint256


initialized: public(bool)
paused: public(bool)

token: public(ERC20)
uToken: public(UnagiiToken)
fundManager: public(FundManager)
# privileges: time lock >= admin >= guardian
timeLock: public(address)
nextTimeLock: public(address)
guardian: public(address)
admin: public(address)

depositLimit: public(uint256)
# token balance of vault tracked internally to protect against share dilution
# from sending tokens directly to this contract
balanceOfVault: public(uint256)
debt: public(uint256)  # debt to users (amount borrowed by fund manager)
# minimum amount of token to be kept in this vault for cheap withdraw
minReserve: public(uint256)
MAX_MIN_RESERVE: constant(uint256) = 10000
# timestamp of last report
lastReport: public(uint256)
# profit locked from report, released over time at a rate set by lockedProfitDegradation
lockedProfit: public(uint256)
MAX_DEGRADATION: constant(uint256) = 10 ** 18
# rate at which locked profit is released
# 0 = forever, MAX_DEGREDATION = 100% of profit is released 1 block after report
lockedProfitDegradation: public(uint256)
# minimum number of block to wait before deposit / withdraw
# used to protect agains flash attacks
blockDelay: public(uint256)
# whitelisted address can bypass block delay check
whitelist: public(HashMap[address, bool])
# set to true if token has fee on transfer
feeOnTransfer: public(bool)

# address of old Vault contract, used for migration
oldVault: public(Vault)
# constants used for protection when migrating vault funds
MIN_OLD_BAL: constant(uint256) = 9990
MAX_MIN_OLD_BAL: constant(uint256) = 10000


@external
def __init__(token: address, uToken: address, guardian: address, oldVault: address):
    self.timeLock = msg.sender
    self.admin = msg.sender
    self.guardian = guardian
    self.token = ERC20(token)
    self.uToken = UnagiiToken(uToken)

    assert self.uToken.token() == self.token.address, "uToken token != token"

    self.paused = True
    self.blockDelay = 1
    self.minReserve = 500  # 5% of free funds
    # 6 hours
    self.lockedProfitDegradation = convert(MAX_DEGRADATION / 21600, uint256)

    if oldVault != ZERO_ADDRESS:
        self.oldVault = Vault(oldVault)
        assert self.oldVault.token() == token, "old vault token != token"
        assert self.oldVault.uToken() == uToken, "old vault uToken != uToken"


@internal
def _safeApprove(token: address, spender: address, amount: uint256):
    res: Bytes[32] = raw_call(
        token,
        concat(
            method_id("approve(address,uint256)"),
            convert(spender, bytes32),
            convert(amount, bytes32),
        ),
        max_outsize=32,
    )
    if len(res) > 0:
        assert convert(res, bool), "approve failed"


@internal
def _safeTransfer(token: address, receiver: address, amount: uint256):
    res: Bytes[32] = raw_call(
        token,
        concat(
            method_id("transfer(address,uint256)"),
            convert(receiver, bytes32),
            convert(amount, bytes32),
        ),
        max_outsize=32,
    )
    if len(res) > 0:
        assert convert(res, bool), "transfer failed"


@internal
def _safeTransferFrom(
    token: address, owner: address, receiver: address, amount: uint256
):
    res: Bytes[32] = raw_call(
        token,
        concat(
            method_id("transferFrom(address,address,uint256)"),
            convert(owner, bytes32),
            convert(receiver, bytes32),
            convert(amount, bytes32),
        ),
        max_outsize=32,
    )
    if len(res) > 0:
        assert convert(res, bool), "transferFrom failed"


@external
def initialize():
    """
    @notice Initialize vault. Transfer tokens and copy states if old vault is set.
    """
    assert not self.initialized, "initialized"

    if self.oldVault.address == ZERO_ADDRESS:
        assert msg.sender in [self.timeLock, self.admin], "!auth"
        self.lastReport = block.timestamp
    else:
        assert msg.sender == self.oldVault.address, "!old vault"

        assert self.uToken.minter() == self, "minter != self"

        assert (
            self.fundManager.address == self.oldVault.fundManager()
        ), "fund manager != old vault fund manager"
        if self.fundManager.address != ZERO_ADDRESS:
            assert self.fundManager.vault() == self, "fund manager vault != self"

        # check balance of old vault >= old balanceOfVault
        bal: uint256 = self.token.balanceOf(self.oldVault.address)
        balOfVault: uint256 = self.oldVault.balanceOfVault()
        assert bal >= balOfVault, "bal < vault"

        diff: uint256 = self.token.balanceOf(self)
        self._safeTransferFrom(self.token.address, self.oldVault.address, self, bal)
        diff = self.token.balanceOf(self) - diff

        # diff may be <= balOfVault if fee on transfer
        assert diff >= balOfVault * MIN_OLD_BAL / MAX_MIN_OLD_BAL, "diff < min"

        self.balanceOfVault = min(balOfVault, diff)
        self.debt = self.oldVault.debt()
        self.lockedProfit = self.oldVault.lockedProfit()
        self.lastReport = self.oldVault.lastReport()

    self.initialized = True


# Migration steps from this vault to new vault
#
# t = token
# ut = unagi token
# v1 = vault 1
# v2 = vault 2
# f = fund manager
#
# action                         | caller
# ----------------------------------------
# 1. v2.setPause(true)           | admin
# 2. v1.setPause(true)           | admin
# 3. ut.setMinter(v2)            | time lock
# 4. f.setVault(v2)              | time lock
# 5. v2.setFundManager(f)        | time lock
# 6. t.approve(v2, bal)          | v1
# 7. t.transferFrom(v1, v2, bal) | v2
# 8. v2 copy states from v1      | v2
#    - balanceOfVault            |
#    - debt                      |
#    - locked profit             |
#    - last report               |
# 9. v1 set state = 0            | v1
#    - balanceOfVault            |
#    - debt                      |
#    - locked profit             |


@external
def migrate(vault: address):
    """
    @notice Migrate to new vault
    @param vault Address of new vault
    """
    assert msg.sender == self.timeLock, "!time lock"
    assert self.initialized, "!initialized"
    assert self.paused, "!paused"

    assert Vault(vault).token() == self.token.address, "new vault token != token"
    assert Vault(vault).uToken() == self.uToken.address, "new vault uToken != uToken"
    # minter is set to new vault
    assert self.uToken.minter() == vault, "minter != new vault"
    # new vault's fund manager is set to current fund manager
    assert (
        Vault(vault).fundManager() == self.fundManager.address
    ), "new vault fund manager != fund manager"
    if self.fundManager.address != ZERO_ADDRESS:
        # fund manager's vault is set to new vault
        assert self.fundManager.vault() == vault, "fund manager vault != new vault"

    # check balance of vault >= balanceOfVault
    bal: uint256 = self.token.balanceOf(self)
    assert bal >= self.balanceOfVault, "bal < vault"

    assert Vault(vault).oldVault() == self, "old vault != self"

    self._safeApprove(self.token.address, vault, bal)
    Vault(vault).initialize()

    # check all tokens where transferred
    assert self.token.balanceOf(self) == 0, "bal != 0"

    log Migrate(vault, self.balanceOfVault, self.debt, self.lockedProfit)

    # reset state
    self.balanceOfVault = 0
    self.debt = 0
    self.lockedProfit = 0


@external
def setNextTimeLock(nextTimeLock: address):
    """
    @notice Set next time lock
    @param nextTimeLock Address of next time lock
    """
    assert msg.sender == self.timeLock, "!time lock"
    self.nextTimeLock = nextTimeLock
    log SetNextTimeLock(nextTimeLock)


@external
def acceptTimeLock():
    """
    @notice Accept time lock
    @dev Only `nextTimeLock` can claim time lock
    """
    assert msg.sender == self.nextTimeLock, "!next time lock"
    self.timeLock = msg.sender
    self.nextTimeLock = ZERO_ADDRESS
    log AcceptTimeLock(msg.sender)


@external
def setAdmin(admin: address):
    assert msg.sender in [self.timeLock, self.admin], "!auth"
    self.admin = admin
    log SetAdmin(admin)


@external
def setGuardian(guardian: address):
    assert msg.sender in [self.timeLock, self.admin], "!auth"
    self.guardian = guardian
    log SetGuardian(guardian)


@external
def setFundManager(fundManager: address):
    """
    @notice Set fund manager
    @param fundManager Address of new fund manager
    """
    assert msg.sender == self.timeLock, "!time lock"

    assert FundManager(fundManager).vault() == self, "fund manager vault != self"
    assert (
        FundManager(fundManager).token() == self.token.address
    ), "fund manager token != token"

    self.fundManager = FundManager(fundManager)
    log SetFundManager(fundManager)


@external
def setPause(paused: bool):
    assert msg.sender in [self.timeLock, self.admin, self.guardian], "!auth"
    self.paused = paused
    log SetPause(paused)


@external
def setMinReserve(minReserve: uint256):
    """
    @notice Set minimum amount of token reserved in this vault for cheap
            withdrawn by user
    @param minReserve Numerator to calculate min reserve
           0 = all funds can be transferred to fund manager
           MAX_MIN_RESERVE = 0 tokens can be transferred to fund manager
    """
    assert msg.sender in [self.timeLock, self.admin], "!auth"
    assert minReserve <= MAX_MIN_RESERVE, "min reserve > max"
    self.minReserve = minReserve


@external
def setLockedProfitDegradation(degradation: uint256):
    """
    @notice Set locked profit degradation (rate locked profit is released)
    @param degradation Rate of degradation
                 0 = profit is locked forever
                 MAX_DEGRADATION = 100% of profit is released 1 block after report
    """
    assert msg.sender in [self.timeLock, self.admin], "!auth"
    assert degradation <= MAX_DEGRADATION, "degradation > max"
    self.lockedProfitDegradation = degradation


@external
def setDepositLimit(limit: uint256):
    """
    @notice Set limit to total deposit
    @param limit Limit for total deposit
    """
    assert msg.sender in [self.timeLock, self.admin], "!auth"
    self.depositLimit = limit


@external
def setBlockDelay(delay: uint256):
    """
    @notice Set block delay, used to protect against flash attacks
    @param delay Number of blocks to delay before user can deposit / withdraw
    """
    assert msg.sender in [self.timeLock, self.admin], "!auth"
    assert delay >= 1, "delay = 0"
    self.blockDelay = delay


@external
def setFeeOnTransfer(feeOnTransfer: bool):
    """
    @notice Enable calculation of actual amount transferred to this vault
            if token has fee on transfer
    @param feeOnTransfer True = enable calculation
                          False = disable calculation
    """
    assert msg.sender in [self.timeLock, self.admin], "!auth"
    self.feeOnTransfer = feeOnTransfer


@external
def setWhitelist(addr: address, approved: bool):
    """
    @notice Approve or disapprove address to skip check on block delay.
            Approved address can deposit, withdraw and transfer uToken in
            a single transaction
    @param approved Boolean True = approve
                             False = disapprove
    """
    assert msg.sender in [self.timeLock, self.admin], "!auth"
    self.whitelist[addr] = approved
    log SetWhitelist(addr, approved)


@internal
@view
def _totalAssets() -> uint256:
    """
    @notice Total amount of token in this vault + amount in fund manager
    @dev State variable `balanceOfVault` is used to track balance of token in
         this contract instead of `token.balanceOf(self)`. This is done to
         protect against uToken shares being diluted by directly sending token
         to this contract.
    @dev Returns total amount of token in this contract
    """
    return self.balanceOfVault + self.debt


@external
@view
def totalAssets() -> uint256:
    return self._totalAssets()


@internal
@view
def _calcLockedProfit() -> uint256:
    """
    @notice Calculated locked profit
    @dev Returns amount of profit locked from last report. Profit is released
         over time, depending on the release rate `lockedProfitDegradation`.
         Profit is locked after `report` to protect against sandwich attack.
    """
    lockedFundsRatio: uint256 = (
        block.timestamp - self.lastReport
    ) * self.lockedProfitDegradation

    if lockedFundsRatio < MAX_DEGRADATION:
        lockedProfit: uint256 = self.lockedProfit
        return lockedProfit - lockedFundsRatio * lockedProfit / MAX_DEGRADATION
    else:
        return 0


@external
@view
def calcLockedProfit() -> uint256:
    return self._calcLockedProfit()


@internal
@view
def _calcFreeFunds() -> uint256:
    """
    @notice Calculate free funds (total assets - locked profit)
    @dev Returns total amount of tokens that can be withdrawn
    """
    return self._totalAssets() - self._calcLockedProfit()


@external
@view
def calcFreeFunds() -> uint256:
    return self._calcFreeFunds()


@internal
@pure
def _calcSharesToMint(
    amount: uint256, totalSupply: uint256, freeFunds: uint256
) -> uint256:
    """
    @notice Calculate uToken shares to mint
    @param amount Amount of token to deposit
    @param totalSupply Total amount of shares
    @param freeFunds Free funds before deposit
    @dev Returns amount of uToken to mint. Input must be numbers before deposit
    @dev Calculated with `freeFunds`, not `totalAssets`
    """
    # s = shares to mint
    # T = total shares before mint
    # a = deposit amount
    # P = total amount of underlying token in vault + fund manager before deposit
    # s / (T + s) = a / (P + a)
    # sP = aT
    # a = 0               | mint s = 0
    # a > 0, T = 0, P = 0 | mint s = a
    # a > 0, T = 0, P > 0 | mint s = a as if P = 0
    # a > 0, T > 0, P = 0 | invalid, equation cannot be true for any s
    # a > 0, T > 0, P > 0 | mint s = aT / P
    if amount == 0:
        return 0
    if totalSupply == 0:
        return amount
    # reverts if free funds = 0
    return amount * totalSupply / freeFunds


@external
@view
def calcSharesToMint(amount: uint256) -> uint256:
    return self._calcSharesToMint(
        amount, self.uToken.totalSupply(), self._calcFreeFunds()
    )


@internal
@pure
def _calcWithdraw(shares: uint256, totalSupply: uint256, freeFunds: uint256) -> uint256:
    """
    @notice Calculate amount of token to withdraw
    @param shares Amount of uToken shares to burn
    @param totalSupply Total amount of shares before burn
    @param freeFunds Free funds
    @dev Returns amount of token to withdraw
    @dev Calculated with `freeFunds`, not `totalAssets`
    """
    # s = shares
    # T = total supply of shares
    # a = amount to withdraw
    # P = total amount of underlying token in vault + fund manager
    # s / T = a / P (constraints T >= s, P >= a)
    # sP = aT
    # s = 0               | a = 0
    # s > 0, T = 0, P = 0 | invalid (violates constraint T >= s)
    # s > 0, T = 0, P > 0 | invalid (violates constraint T >= s)
    # s > 0, T > 0, P = 0 | a = 0
    # s > 0, T > 0, P > 0 | a = sP / T
    if shares == 0:
        return 0
    # invalid if total supply = 0
    return shares * freeFunds / totalSupply


@external
@view
def calcWithdraw(shares: uint256) -> uint256:
    return self._calcWithdraw(shares, self.uToken.totalSupply(), self._calcFreeFunds())


@external
@nonreentrant("lock")
def deposit(amount: uint256, _min: uint256) -> uint256:
    """
    @notice Deposit token into vault
    @param amount Amount of token to deposit
    @param _min Minimum amount of uToken to be minted
    @dev Returns actual amount of uToken minted
    """
    assert self.initialized, "!initialized"
    assert not self.paused, "paused"
    # check block delay or whitelisted
    assert (
        block.number >= self.uToken.lastBlock(msg.sender) + self.blockDelay
        or self.whitelist[msg.sender]
    ), "block < delay"

    _amount: uint256 = min(amount, self.token.balanceOf(msg.sender))
    assert _amount > 0, "deposit = 0"

    # check deposit limit
    assert self._totalAssets() + _amount <= self.depositLimit, "deposit limit"

    totalSupply: uint256 = self.uToken.totalSupply()
    freeFunds: uint256 = self._calcFreeFunds()

    # amount of tokens that this vault received
    diff: uint256 = 0
    if self.feeOnTransfer:
        # actual amount transferred may be less than `amount`
        # if token has fee on transfer
        diff = self.token.balanceOf(self)
        self._safeTransferFrom(self.token.address, msg.sender, self, _amount)
        diff = self.token.balanceOf(self) - diff
    else:
        self._safeTransferFrom(self.token.address, msg.sender, self, _amount)
        diff = _amount

    assert diff > 0, "diff = 0"

    # calculate with free funds before deposit
    shares: uint256 = self._calcSharesToMint(diff, totalSupply, freeFunds)
    assert shares >= _min, "shares < min"

    self.balanceOfVault += diff
    self.uToken.mint(msg.sender, shares)

    # check token balance >= balanceOfVault
    assert self.token.balanceOf(self) >= self.balanceOfVault, "bal < vault"

    log Deposit(msg.sender, _amount, diff, shares)

    return shares


@external
@nonreentrant("lock")
def withdraw(shares: uint256, _min: uint256) -> uint256:
    """
    @notice Withdraw token from vault
    @param shares Amount of uToken to burn
    @param _min Minimum amount of token that msg.sender will receive
    @dev Returns actual amount of token transferred to msg.sender
    """
    assert self.initialized, "!initialized"
    # check block delay or whitelisted
    assert (
        block.number >= self.uToken.lastBlock(msg.sender) + self.blockDelay
        or self.whitelist[msg.sender]
    ), "block < delay"

    _shares: uint256 = min(shares, self.uToken.balanceOf(msg.sender))
    assert _shares > 0, "shares = 0"

    amount: uint256 = self._calcWithdraw(
        _shares, self.uToken.totalSupply(), self._calcFreeFunds()
    )

    # withdraw from fund manager if amount to withdraw > balance of vault
    if amount > self.balanceOfVault:
        diff: uint256 = self.token.balanceOf(self)
        # loss = debt - total assets in fund manager + any loss from strategies
        loss: uint256 = self.fundManager.withdraw(amount - self.balanceOfVault)
        diff = self.token.balanceOf(self) - diff

        # diff + loss may be >= amount
        if loss > 0:
            # msg.sender must cover all of loss
            amount -= loss
            self.debt -= loss

        self.debt -= diff
        self.balanceOfVault += diff

        if amount > self.balanceOfVault:
            amount = self.balanceOfVault

    self.uToken.burn(msg.sender, _shares)

    assert amount >= _min, "amount < min"
    self.balanceOfVault -= amount

    self._safeTransfer(self.token.address, msg.sender, amount)

    # check token balance >= balanceOfVault
    assert self.token.balanceOf(self) >= self.balanceOfVault, "bal < vault"

    log Withdraw(msg.sender, _shares, amount)

    # actual amount received by msg.sender may be less if fee on transfer
    return amount


@internal
@view
def _calcMinReserve() -> uint256:
    """
    @notice Calculate minimum amount of token that is reserved in vault for
            cheap withdraw by users
    @dev Returns min reserve
    """
    freeFunds: uint256 = self._calcFreeFunds()
    return freeFunds * self.minReserve / MAX_MIN_RESERVE


@external
def calcMinReserve() -> uint256:
    return self._calcMinReserve()


@internal
@view
def _calcMaxBorrow() -> uint256:
    """
    @notice Calculate amount of token available for fund manager to borrow
    @dev Returns amount of token fund manager can borrow
    """
    if (
        (not self.initialized)
        or self.paused
        or self.fundManager.address == ZERO_ADDRESS
    ):
        return 0

    minBal: uint256 = self._calcMinReserve()

    if self.balanceOfVault > minBal:
        return self.balanceOfVault - minBal
    return 0


@external
@view
def calcMaxBorrow() -> uint256:
    return self._calcMaxBorrow()


@external
def borrow(amount: uint256) -> uint256:
    """
    @notice Borrow token from vault
    @dev Only fund manager can borrow
    @dev Returns actual amount that was given to fund manager
    """
    assert self.initialized, "!initialized"
    assert not self.paused, "paused"
    assert msg.sender == self.fundManager.address, "!fund manager"

    available: uint256 = self._calcMaxBorrow()
    _amount: uint256 = min(amount, available)
    assert _amount > 0, "borrow = 0"

    self._safeTransfer(self.token.address, msg.sender, _amount)

    self.balanceOfVault -= _amount
    # include fee on trasfer to debt
    self.debt += _amount

    # check token balance >= balanceOfVault
    assert self.token.balanceOf(self) >= self.balanceOfVault, "bal < vault"

    log Borrow(msg.sender, amount, _amount)

    return _amount


@external
def repay(amount: uint256) -> uint256:
    """
    @notice Repay token to vault
    @dev Only fund manager can borrow
    @dev Returns actual amount that was repaid by fund manager
    """
    assert self.initialized, "!initialized"
    assert msg.sender == self.fundManager.address, "!fund manager"

    _amount: uint256 = min(amount, self.debt)
    assert _amount > 0, "repay = 0"

    diff: uint256 = self.token.balanceOf(self)
    self._safeTransferFrom(self.token.address, msg.sender, self, _amount)
    diff = self.token.balanceOf(self) - diff

    self.balanceOfVault += diff
    # exclude fee on transfer from debt payment
    self.debt -= diff

    # check token balance >= balanceOfVault
    assert self.token.balanceOf(self) >= self.balanceOfVault, "bal < vault"

    log Repay(msg.sender, amount, diff)

    return diff


@external
def report(gain: uint256, loss: uint256):
    """
    @notice Report profit or loss
    @param gain Profit since last report
    @param loss Loss since last report
    @dev Only fund manager can call
    @dev Locks profit to be release over time
    """
    assert self.initialized, "!initialized"
    assert msg.sender == self.fundManager.address, "!fund manager"
    # can't have both gain and loss > 0
    assert (gain >= 0 and loss == 0) or (gain == 0 and loss >= 0), "gain and loss > 0"

    # calculate current locked profit
    lockedProfit: uint256 = self._calcLockedProfit()
    diff: uint256 = 0  # actual amount transferred if gain > 0

    if gain > 0:
        diff = self.token.balanceOf(self)
        self._safeTransferFrom(self.token.address, msg.sender, self, gain)
        diff = self.token.balanceOf(self) - diff

        # free funds = bal + diff + debt - (locked profit + diff)
        self.balanceOfVault += diff
        self.lockedProfit = lockedProfit + diff
    elif loss > 0:
        # free funds = bal + debt - loss - (locked profit - loss)
        self.debt -= loss
        # deduct locked profit
        if lockedProfit > loss:
            self.lockedProfit -= loss
        else:
            # no locked profit to be released
            self.lockedProfit = 0

    self.lastReport = block.timestamp

    # check token balance >= balanceOfVault
    assert self.token.balanceOf(self) >= self.balanceOfVault, "bal < vault"

    # log updated debt and lockedProfit
    log Report(
        msg.sender, self.balanceOfVault, self.debt, gain, loss, diff, self.lockedProfit
    )


@external
def forceUpdateBalanceOfVault():
    """
    @notice Force `balanceOfVault` to equal `token.balanceOf(self)`
    @dev Only use in case of emergency if `balanceOfVault` is > actual balance
    """
    assert self.initialized, "!initialized"
    assert msg.sender in [self.timeLock, self.admin], "!auth"

    bal: uint256 = self.token.balanceOf(self)
    assert bal < self.balanceOfVault, "bal >= vault"

    self.balanceOfVault = bal
    log ForceUpdateBalanceOfVault(bal)


@external
def skim():
    """
    @notice Transfer excess token sent to this contract to admin or time lock
    @dev actual token balance must be >= `balanceOfVault`
    """
    assert msg.sender == self.timeLock, "!time lock"
    self._safeTransfer(
        self.token.address, msg.sender, self.token.balanceOf(self) - self.balanceOfVault
    )


@external
def sweep(token: address):
    """
    @notice Transfer any token (except `token`) accidentally sent to this contract
            to admin or time lock
    @dev Cannot transfer `token`
    """
    assert msg.sender in [self.timeLock, self.admin], "!auth"
    assert token != self.token.address, "protected"
    self._safeTransfer(token, msg.sender, ERC20(token).balanceOf(self))

• No Contract Security Audit Submitted- Submit Audit Here

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