Address Contract Partially Verified
Address
0xa2Bcd1a4Efbd04B63cd03f5aFf2561106ebCCE00
Balance
0.002727 ETH
Nonce
1
Code Size
8279 bytes
Creator
0x71F718D3...1683 at tx 0x98e371b2...4bda91
Indexed Transactions
0
Contract Bytecode
8279 bytes
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Verified Source Code Partial Match
Compiler: v0.3.10+commit.91361694
FeeCollector.vy 472 lines
# pragma version 0.3.10
"""
@title FeeCollector
@license MIT
@author Curve Finance
@notice Collects fees and delegates to burner for exchange
"""
interface ERC20:
def approve(_to: address, _value: uint256): nonpayable
def transfer(_to: address, _value: uint256) -> bool: nonpayable
def transferFrom(_from: address, _to: address, _value: uint256) -> bool: nonpayable
def balanceOf(_owner: address) -> uint256: view
interface wETH:
def balanceOf(_owner: address) -> uint256: view
def transferFrom(_sender: address, _receiver: address, _amount: uint256): nonpayable
def transfer(_receiver: address, _amount: uint256): nonpayable
def withdraw(_amount: uint256): nonpayable
def deposit(): payable
interface Curve:
def withdraw_admin_fees(): nonpayable
interface Burner:
def burn(_coins: DynArray[ERC20, MAX_LEN], _receiver: address): nonpayable
def push_target() -> uint256: nonpayable
def supportsInterface(_interface_id: bytes4) -> bool: view
interface Hooker:
def duty_act(_hook_inputs: DynArray[HookInput, MAX_HOOK_LEN], _receiver: address=msg.sender) -> uint256: payable
def buffer_amount() -> uint256: view
def supportsInterface(_interface_id: bytes4) -> bool: view
event SetMaxFee:
epoch: indexed(Epoch)
max_fee: uint256
event SetBurner:
burner: indexed(Burner)
event SetHooker:
hooker: indexed(Hooker)
event SetTarget:
target: indexed(ERC20)
event SetKilled:
coin: indexed(ERC20)
epoch_mask: Epoch
event SetOwner:
owner: indexed(address)
event SetEmergencyOwner:
emergency_owner: indexed(address)
enum Epoch:
SLEEP # 1
COLLECT # 2
EXCHANGE # 4
FORWARD # 8
struct Transfer:
coin: ERC20
to: address
amount: uint256 # 2^256-1 for the whole balance
struct HookInput:
hook_id: uint8
value: uint256
data: Bytes[8192]
struct RecoverInput:
coin: ERC20
amount: uint256
struct KilledInput:
coin: ERC20
killed: Epoch # True where killed
ETH_ADDRESS: constant(address) = 0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE
WETH: immutable(wETH)
MAX_LEN: constant(uint256) = 64
MAX_HOOK_LEN: constant(uint256) = 32
ONE: constant(uint256) = 10 ** 18 # Precision
START_TIME: constant(uint256) = 1600300800 # ts of distribution start
WEEK: constant(uint256) = 7 * 24 * 3600
EPOCH_TIMESTAMPS: constant(uint256[17]) = [
0, 0, # 1
4 * 24 * 3600, # 2
0, 5 * 24 * 3600, # 4
0, 0, 0, 6 * 24 * 3600, # 8
0, 0, 0, 0, 0, 0, 0, WEEK, # 16, next period
]
target: public(ERC20) # coin swapped into
max_fee: public(uint256[9]) # max_fee[Epoch]
BURNER_INTERFACE_ID: constant(bytes4) = 0xa3b5e311
HOOKER_INTERFACE_ID: constant(bytes4) = 0xe569b44d
burner: public(Burner)
hooker: public(Hooker)
last_hooker_approve: uint256
is_killed: public(HashMap[ERC20, Epoch])
ALL_COINS: constant(ERC20) = empty(ERC20) # Auxiliary indicator for all coins (=ZERO_ADDRESS)
owner: public(address)
emergency_owner: public(address)
@external
def __init__(_target_coin: ERC20, _weth: wETH, _owner: address, _emergency_owner: address):
"""
@notice Contract constructor
@param _target_coin Coin to swap to
@param _weth Wrapped ETH(native coin) address
@param _owner Owner address
@param _emergency_owner Emergency owner address. Can kill the contract
"""
self.target = _target_coin
WETH = _weth
self.owner = _owner
self.emergency_owner = _emergency_owner
self.max_fee[convert(Epoch.COLLECT, uint256)] = ONE / 100 # 1%
self.max_fee[convert(Epoch.FORWARD, uint256)] = ONE / 100 # 1%
self.is_killed[ALL_COINS] = Epoch.COLLECT | Epoch.FORWARD # Set burner first
self.is_killed[_target_coin] = Epoch.COLLECT | Epoch.EXCHANGE # Keep target coin in contract
log SetTarget(_target_coin)
log SetOwner(_owner)
log SetEmergencyOwner(_emergency_owner)
log SetMaxFee(Epoch.COLLECT, ONE / 100)
log SetMaxFee(Epoch.FORWARD, ONE / 100)
log SetKilled(ALL_COINS, Epoch.COLLECT | Epoch.FORWARD)
log SetKilled(_target_coin, Epoch.COLLECT | Epoch.FORWARD)
@external
@payable
def __default__():
# Deposited ETH can be converted using `burn(ETH_ADDRESS)`
pass
@external
def withdraw_many(_pools: DynArray[address, MAX_LEN]):
"""
@notice Withdraw admin fees from multiple pools
@param _pools List of pool address to withdraw admin fees from
"""
for pool in _pools:
Curve(pool).withdraw_admin_fees()
@external
@payable
def burn(_coin: address) -> bool:
"""
@notice Transfer coin from contract with approval
@dev Needed for back compatability along with dealing raw ETH
@param _coin Coin to transfer
@return True if did not fail, back compatability
"""
if _coin == ETH_ADDRESS: # Deposit
WETH.deposit(value=self.balance)
else:
amount: uint256 = ERC20(_coin).balanceOf(msg.sender)
ERC20(_coin).transferFrom(msg.sender, self, amount)
return True
@internal
@pure
def _epoch_ts(ts: uint256) -> Epoch:
ts = (ts - START_TIME) % WEEK
for epoch in [Epoch.SLEEP, Epoch.COLLECT, Epoch.EXCHANGE, Epoch.FORWARD]:
if ts < EPOCH_TIMESTAMPS[2 * convert(epoch, uint256)]:
return epoch
raise UNREACHABLE
@external
@view
def epoch(ts: uint256=block.timestamp) -> Epoch:
"""
@notice Get epoch at certain timestamp
@param ts Timestamp. Current by default
@return Epoch
"""
return self._epoch_ts(ts)
@internal
@pure
def _epoch_time_frame(epoch: Epoch, ts: uint256) -> (uint256, uint256):
subset: uint256 = convert(epoch, uint256)
assert subset & (subset - 1) == 0, "Bad Epoch"
ts = ts - (ts - START_TIME) % WEEK
return (ts + EPOCH_TIMESTAMPS[convert(epoch, uint256)], ts + EPOCH_TIMESTAMPS[2 * convert(epoch, uint256)])
@external
@view
def epoch_time_frame(_epoch: Epoch, _ts: uint256=block.timestamp) -> (uint256, uint256):
"""
@notice Get time frame of certain epoch
@param _epoch Epoch
@param _ts Timestamp to anchor to. Current by default
@return [start, end) time frame boundaries
"""
return self._epoch_time_frame(_epoch, _ts)
@internal
@view
def _fee(epoch: Epoch, ts: uint256) -> uint256:
start: uint256 = 0
end: uint256 = 0
start, end = self._epoch_time_frame(epoch, ts)
if ts >= end:
return 0
return self.max_fee[convert(epoch, uint256)] * (ts + 1 - start) / (end - start)
@external
@view
def fee(_epoch: Epoch=empty(Epoch), _ts: uint256=block.timestamp) -> uint256:
"""
@notice Calculate keeper's fee
@param _epoch Epoch to count fee for
@param _ts Timestamp of collection
@return Fee with base 10^18
"""
if _epoch == empty(Epoch):
return self._fee(self._epoch_ts(_ts), _ts)
return self._fee(_epoch, _ts)
@external
@nonreentrant("transfer")
def transfer(_transfers: DynArray[Transfer, MAX_LEN]):
"""
@dev No approvals so can change burner easily
@param _transfers Transfers to apply
"""
assert msg.sender == self.burner.address, "Only Burner"
epoch: Epoch = self._epoch_ts(block.timestamp)
assert epoch in Epoch.COLLECT | Epoch.EXCHANGE, "Wrong Epoch"
for transfer in _transfers:
assert not self.is_killed[transfer.coin] in epoch, "Killed coin"
amount: uint256 = transfer.amount
if amount == max_value(uint256):
amount = transfer.coin.balanceOf(self)
assert transfer.coin.transfer(transfer.to, amount, default_return_value=True)
@external
@nonreentrant("collect")
def collect(_coins: DynArray[ERC20, MAX_LEN], _receiver: address=msg.sender):
"""
@notice Collect earned fees. Collection should happen under callback to earn caller fees.
@param _coins Coins to collect sorted in ascending order
@param _receiver Receiver of caller `collect_fee`s
"""
assert self._epoch_ts(block.timestamp) == Epoch.COLLECT, "Wrong epoch"
assert not self.is_killed[ALL_COINS] in Epoch.COLLECT, "Killed epoch"
for i in range(len(_coins), bound=MAX_LEN):
assert not self.is_killed[_coins[i]] in Epoch.COLLECT, "Killed coin"
# Eliminate case of repeated coins
if i > 0:
assert convert(_coins[i].address, uint160) > convert(_coins[i - 1].address, uint160), "Coins not sorted"
self.burner.burn(_coins, _receiver)
@external
@view
def can_exchange(_coins: DynArray[ERC20, MAX_LEN]) -> bool:
"""
@notice Check whether coins are allowed to be exchanged
@param _coins Coins to exchange
@return Boolean value if coins are allowed to be exchanged
"""
if self._epoch_ts(block.timestamp) != Epoch.EXCHANGE or\
self.is_killed[ALL_COINS] in Epoch.EXCHANGE:
return False
for coin in _coins:
if self.is_killed[coin] in Epoch.EXCHANGE:
return False
return True
@external
@payable
@nonreentrant("forward")
def forward(_hook_inputs: DynArray[HookInput, MAX_HOOK_LEN], _receiver: address=msg.sender) -> uint256:
"""
@notice Transfer target coin forward
@param _hook_inputs Input parameters for forward hooks
@param _receiver Receiver of caller `forward_fee`
@return Amount of received fee
"""
assert self._epoch_ts(block.timestamp) == Epoch.FORWARD, "Wrong epoch"
target: ERC20 = self.target
assert not (self.is_killed[ALL_COINS] | self.is_killed[target]) in Epoch.FORWARD, "Killed"
self.burner.push_target()
amount: uint256 = target.balanceOf(self)
# Account buffer
hooker: Hooker = self.hooker
hooker_buffer: uint256 = hooker.buffer_amount()
amount -= min(hooker_buffer, amount)
fee: uint256 = self._fee(Epoch.FORWARD, block.timestamp) * amount / ONE
target.transfer(_receiver, fee)
target.transfer(hooker.address, amount - fee)
if self.last_hooker_approve < (block.timestamp - START_TIME) / WEEK: # First time this week
target.approve(hooker.address, hooker_buffer)
self.last_hooker_approve = (block.timestamp - START_TIME) / WEEK
fee += hooker.duty_act(_hook_inputs, _receiver, value=msg.value)
return fee
@external
def recover(_recovers: DynArray[RecoverInput, MAX_LEN], _receiver: address):
"""
@notice Recover ERC20 tokens or Ether from this contract
@dev Callable only by owner and emergency owner
@param _recovers (Token, amount) to recover
@param _receiver Receiver of coins
"""
assert msg.sender in [self.owner, self.emergency_owner], "Only owner"
for input in _recovers:
amount: uint256 = input.amount
if input.coin.address == ETH_ADDRESS:
if amount == max_value(uint256):
amount = self.balance
raw_call(_receiver, b"", value=amount)
else:
if amount == max_value(uint256):
amount = input.coin.balanceOf(self)
input.coin.transfer(_receiver, amount) # do not need safe transfer
@external
def set_max_fee(_epoch: Epoch, _max_fee: uint256):
"""
@notice Set keeper's max fee
@dev Callable only by owner
@param _epoch Epoch to set fee for
@param _max_fee Maximum fee to set
"""
assert msg.sender == self.owner, "Only owner"
subset: uint256 = convert(_epoch, uint256)
assert subset & (subset - 1) == 0, "Bad Epoch"
assert _max_fee <= ONE, "Bad max_fee"
self.max_fee[convert(_epoch, uint256)] = _max_fee
log SetMaxFee(_epoch, _max_fee)
@external
def set_burner(_new_burner: Burner):
"""
@notice Set burner for exchanging coins, must implement BURNER_INTERFACE
@dev Callable only by owner
@param _new_burner Address of the new contract
"""
assert msg.sender == self.owner, "Only owner"
assert _new_burner.supportsInterface(BURNER_INTERFACE_ID)
self.burner = _new_burner
log SetBurner(_new_burner)
@external
def set_hooker(_new_hooker: Hooker):
"""
@notice Set contract for hooks, must implement HOOKER_INTERFACE
@dev Callable only by owner
@param _new_hooker Address of the new contract
"""
assert msg.sender == self.owner, "Only owner"
assert _new_hooker.supportsInterface(HOOKER_INTERFACE_ID)
if self.hooker != empty(Hooker):
self.target.approve(self.hooker.address, 0)
self.hooker = _new_hooker
log SetHooker(_new_hooker)
@external
def set_target(_new_target: ERC20):
"""
@notice Set new coin for fees accumulation
@dev Callable only by owner
@param _new_target Address of the new target coin
"""
assert msg.sender == self.owner, "Only owner"
target: ERC20 = self.target
self.is_killed[target] = empty(Epoch) # allow to collect and exchange
log SetKilled(target, empty(Epoch))
self.target = _new_target
self.is_killed[_new_target] = Epoch.COLLECT | Epoch.EXCHANGE # Keep target coin in contract
log SetTarget(_new_target)
log SetKilled(_new_target, Epoch.COLLECT | Epoch.EXCHANGE)
@external
def set_killed(_input: DynArray[KilledInput, MAX_LEN]):
"""
@notice Stop a contract or specific coin to be burnt
@dev Callable only by owner or emergency owner
@param _input Array of (coin address, killed phases enum)
"""
assert msg.sender in [self.owner, self.emergency_owner], "Only owner"
for input in _input:
self.is_killed[input.coin] = input.killed
log SetKilled(input.coin, input.killed)
@external
def set_owner(_new_owner: address):
"""
@notice Set owner of the contract
@dev Callable only by current owner
@param _new_owner Address of the new owner
"""
assert msg.sender == self.owner, "Only owner"
assert _new_owner != empty(address)
self.owner = _new_owner
log SetOwner(_new_owner)
@external
def set_emergency_owner(_new_owner: address):
"""
@notice Set emergency owner of the contract
@dev Callable only by current owner
@param _new_owner Address of the new emergency owner
"""
assert msg.sender == self.owner, "Only owner"
assert _new_owner != empty(address)
self.emergency_owner = _new_owner
log SetEmergencyOwner(_new_owner)
Read Contract
burner 0x27810b6e → address
can_exchange 0xdc7168e9 → bool
emergency_owner 0x63a4042a → address
epoch 0x900cf0cf → uint256
epoch 0x5487c577 → uint256
epoch_time_frame 0xdffe059c → uint256, uint256
epoch_time_frame 0xb676f748 → uint256, uint256
fee 0xddca3f43 → uint256
fee 0x39b37ab0 → uint256
fee 0x939f5ea4 → uint256
hooker 0x6dfaf772 → address
is_killed 0x59e63166 → uint256
max_fee 0xc47339c2 → uint256
owner 0x8da5cb5b → address
target 0xd4b83992 → address
Write Contract 15 functions
These functions modify contract state and require a wallet transaction to execute.
burn 0x89afcb44
address _coin
returns: bool
collect 0xa4520aee
address[] _coins
collect 0x42b1689d
address[] _coins
address _receiver
forward 0xa6171aba
tuple[] _hook_inputs
returns: uint256
forward 0xfd37e0e5
tuple[] _hook_inputs
address _receiver
returns: uint256
recover 0x7ebf9f42
tuple[] _recovers
address _receiver
set_burner 0xe0774862
address _new_burner
set_emergency_owner 0x7e1b1e4b
address _new_owner
set_hooker 0xa35eba8d
address _new_hooker
set_killed 0x87a7050c
tuple[] _input
set_max_fee 0x97160c5b
uint256 _epoch
uint256 _max_fee
set_owner 0x7cb97b2b
address _new_owner
set_target 0x427c9a95
address _new_target
transfer 0xf06ed066
tuple[] _transfers
withdraw_many 0x755da811
address[] _pools
Token Balances (2)
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