Contract Source Code (Vyper language format)

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# pragma version 0.3.10
"""
@title Child Liquidity Gauge Factory
@license MIT
@author Curve Finance
@custom:version 2.0.0
"""

version: public(constant(String[8])) = "2.0.0"


from vyper.interfaces import ERC20

interface ChildGauge:
    def initialize(_lp_token: address, _root: address, _manager: address): nonpayable
    def integrate_fraction(_user: address) -> uint256: view
    def user_checkpoint(_user: address) -> bool: nonpayable

interface CallProxy:
    def anyCall(
        _to: address, _data: Bytes[1024], _fallback: address, _to_chain_id: uint256
    ): nonpayable


event DeployedGauge:
    _implementation: indexed(address)
    _lp_token: indexed(address)
    _deployer: indexed(address)
    _salt: bytes32
    _gauge: address

event Minted:
    _user: indexed(address)
    _gauge: indexed(address)
    _new_total: uint256

event UpdateImplementation:
    _old_implementation: address
    _new_implementation: address

event UpdateVotingEscrow:
    _old_voting_escrow: address
    _new_voting_escrow: address

event UpdateRoot:
    _factory: address
    _implementation: address

event UpdateManager:
    _manager: address

event UpdateCallProxy:
    _old_call_proxy: address
    _new_call_proxy: address

event UpdateMirrored:
    _gauge: indexed(address)
    _mirrored: bool

event TransferOwnership:
    _old_owner: address
    _new_owner: address


WEEK: constant(uint256) = 86400 * 7


crv: public(ERC20)


get_implementation: public(address)
voting_escrow: public(address)

owner: public(address)
future_owner: public(address)
manager: public(address)

root_factory: public(address)
root_implementation: public(address)
call_proxy: public(address)
# [last_request][has_counterpart][is_valid_gauge]
gauge_data: public(HashMap[address, uint256])
# user -> gauge -> value
minted: public(HashMap[address, HashMap[address, uint256]])

get_gauge_from_lp_token: public(HashMap[address, address])
get_gauge_count: public(uint256)
get_gauge: public(address[max_value(int128)])


@external
def __init__(_call_proxy: address, _root_factory: address, _root_impl: address, _crv: address, _owner: address):
    """
    @param _call_proxy Contract for
    @param _root_factory Root factory to anchor to
    @param _root_impl Address of root gauge implementation to calculate mirror (can be updated)
    @param _crv Bridged CRV token address (might be zero if not known yet)
    @param _owner Owner of factory (xgov)
    """
    self.crv = ERC20(_crv)

    self.call_proxy = _call_proxy
    log UpdateCallProxy(empty(address), _call_proxy)

    assert _root_factory != empty(address)
    assert _root_impl != empty(address)
    self.root_factory = _root_factory
    self.root_implementation = _root_impl
    log UpdateRoot(_root_factory, _root_impl)

    self.owner = _owner
    log TransferOwnership(empty(address), _owner)

    self.manager = msg.sender
    log UpdateManager(msg.sender)


@internal
def _psuedo_mint(_gauge: address, _user: address):
    gauge_data: uint256 = self.gauge_data[_gauge]
    assert gauge_data != 0  # dev: invalid gauge

    # if is_mirrored and last_request != this week
    if gauge_data & 2 != 0 and (gauge_data >> 2) / WEEK != block.timestamp / WEEK:
        CallProxy(self.call_proxy).anyCall(
            self,
            _abi_encode(_gauge, method_id=method_id("transmit_emissions(address)")),
            empty(address),
            1,
        )
        # update last request time
        self.gauge_data[_gauge] = block.timestamp << 2 + 3

    assert ChildGauge(_gauge).user_checkpoint(_user)
    total_mint: uint256 = ChildGauge(_gauge).integrate_fraction(_user)
    to_mint: uint256 = total_mint - self.minted[_user][_gauge]

    if to_mint != 0 and self.crv != empty(ERC20):
        assert self.crv.transfer(_user, to_mint, default_return_value=True)
        self.minted[_user][_gauge] = total_mint

        log Minted(_user, _gauge, total_mint)


@external
@nonreentrant("lock")
def mint(_gauge: address):
    """
    @notice Mint everything which belongs to `msg.sender` and send to them
    @param _gauge `LiquidityGauge` address to get mintable amount from
    """
    self._psuedo_mint(_gauge, msg.sender)


@external
@nonreentrant("lock")
def mint_many(_gauges: address[32]):
    """
    @notice Mint everything which belongs to `msg.sender` across multiple gauges
    @param _gauges List of `LiquidityGauge` addresses
    """
    for i in range(32):
        if _gauges[i] == empty(address):
            pass
        self._psuedo_mint(_gauges[i], msg.sender)


@external
def deploy_gauge(_lp_token: address, _salt: bytes32, _manager: address = msg.sender) -> address:
    """
    @notice Deploy a liquidity gauge
    @param _lp_token The token to deposit in the gauge
    @param _salt A value to deterministically deploy a gauge
    @param _manager The address to set as manager of the gauge
    """
    if self.get_gauge_from_lp_token[_lp_token] != empty(address):
        # overwriting lp_token -> gauge mapping requires
        assert msg.sender == self.owner  # dev: only owner

    gauge_data: uint256 = 1  # set is_valid_gauge = True
    implementation: address = self.get_implementation
    salt: bytes32 = keccak256(_abi_encode(chain.id, _salt))
    gauge: address = create_minimal_proxy_to(
        implementation, salt=salt
    )

    if msg.sender == self.call_proxy:
        gauge_data += 2  # set mirrored = True
        log UpdateMirrored(gauge, True)
        # issue a call to the root chain to deploy a root gauge
        CallProxy(self.call_proxy).anyCall(
            self,
            _abi_encode(chain.id, _salt, method_id=method_id("deploy_gauge(uint256,bytes32)")),
            empty(address),
            1
        )

    self.gauge_data[gauge] = gauge_data

    idx: uint256 = self.get_gauge_count
    self.get_gauge[idx] = gauge
    self.get_gauge_count = idx + 1
    self.get_gauge_from_lp_token[_lp_token] = gauge

    # derive root gauge address
    gauge_codehash: bytes32 = keccak256(
        concat(
            0x602d3d8160093d39f3363d3d373d3d3d363d73,
            convert(self.root_implementation, bytes20),
            0x5af43d82803e903d91602b57fd5bf3,
        )
    )
    digest: bytes32 = keccak256(concat(0xFF, convert(self.root_factory, bytes20), salt, gauge_codehash))
    root: address = convert(convert(digest, uint256) & convert(max_value(uint160), uint256), address)

    # If root is uninitialized, self.owner can always set the root gauge manually
    # on the gauge contract itself via set_root_gauge method
    ChildGauge(gauge).initialize(_lp_token, root, _manager)

    log DeployedGauge(implementation, _lp_token, msg.sender, _salt, gauge)
    return gauge


@external
def set_crv(_crv: ERC20):
    """
    @notice Sets CRV token address
    @dev Child gauges reference the factory to fetch CRV address
         If empty, the gauges do not mint any CRV tokens.
    @param _crv address of CRV token on child chain
    """
    assert msg.sender == self.owner
    assert _crv != empty(ERC20)

    self.crv = _crv


@external
def set_root(_factory: address, _implementation: address):
    """
    @notice Update root addresses
    @dev Addresses are used only as helper methods
    @param _factory Root gauge factory
    @param _implementation Root gauge
    """
    assert msg.sender in [self.owner, self.manager]  # dev: access denied

    self.root_factory = _factory
    self.root_implementation = _implementation
    log UpdateRoot(_factory, _implementation)


@external
def set_voting_escrow(_voting_escrow: address):
    """
    @notice Update the voting escrow contract
    @param _voting_escrow Contract to use as the voting escrow oracle
    """
    assert msg.sender == self.owner  # dev: only owner

    log UpdateVotingEscrow(self.voting_escrow, _voting_escrow)
    self.voting_escrow = _voting_escrow


@external
def set_implementation(_implementation: address):
    """
    @notice Set the implementation
    @param _implementation The address of the implementation to use
    """
    assert msg.sender == self.owner  # dev: only owner

    log UpdateImplementation(self.get_implementation, _implementation)
    self.get_implementation = _implementation


@external
def set_mirrored(_gauge: address, _mirrored: bool):
    """
    @notice Set the mirrored bit of the gauge data for `_gauge`
    @param _gauge The gauge of interest
    @param _mirrored Boolean deteremining whether to set the mirrored bit to True/False
    """
    gauge_data: uint256 = self.gauge_data[_gauge]
    assert gauge_data != 0  # dev: invalid gauge
    assert msg.sender == self.owner  # dev: only owner

    gauge_data = gauge_data | 1  # set is_valid_gauge = True
    if _mirrored:
        gauge_data += 2  # set is_mirrored = True

    self.gauge_data[_gauge] = gauge_data
    log UpdateMirrored(_gauge, _mirrored)


@external
def set_call_proxy(_new_call_proxy: address):
    """
    @notice Set the address of the call proxy used
    @dev _new_call_proxy should adhere to the same interface as defined
    @param _new_call_proxy Address of the cross chain call proxy
    """
    assert msg.sender == self.owner

    log UpdateCallProxy(self.call_proxy, _new_call_proxy)
    self.call_proxy = _new_call_proxy


@external
def set_manager(_new_manager: address):
    assert msg.sender in [self.owner, self.manager]  # dev: access denied

    self.manager = _new_manager
    log UpdateManager(_new_manager)


@external
def commit_transfer_ownership(_future_owner: address):
    """
    @notice Transfer ownership to `_future_owner`
    @param _future_owner The account to commit as the future owner
    """
    assert msg.sender == self.owner  # dev: only owner

    self.future_owner = _future_owner


@external
def accept_transfer_ownership():
    """
    @notice Accept the transfer of ownership
    @dev Only the committed future owner can call this function
    """
    assert msg.sender == self.future_owner  # dev: only future owner

    log TransferOwnership(self.owner, msg.sender)
    self.owner = msg.sender


@view
@external
def is_valid_gauge(_gauge: address) -> bool:
    """
    @notice Query whether the gauge is a valid one deployed via the factory
    @param _gauge The address of the gauge of interest
    """
    return self.gauge_data[_gauge] != 0


@view
@external
def is_mirrored(_gauge: address) -> bool:
    """
    @notice Query whether the gauge is mirrored on Ethereum mainnet
    @param _gauge The address of the gauge of interest
    """
    return (self.gauge_data[_gauge] & 2) != 0


@view
@external
def last_request(_gauge: address) -> uint256:
    """
    @notice Query the timestamp of the last cross chain request for emissions
    @param _gauge The address of the gauge of interest
    """
    return self.gauge_data[_gauge] >> 2

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ility":"view","type":"function","name":"owner","inputs":[],"outputs":[{"name":"","type":"address"}]},{"stateMutability":"view","type":"function","name":"future_owner","inputs":[],"outputs":[{"name":"","type":"address"}]},{"stateMutability":"view","type":"function","name":"manager","inputs":[],"outputs":[{"name":"","type":"address"}]},{"stateMutability":"view","type":"function","name":"root_factory","inputs":[],"outputs":[{"name":"","type":"address"}]},{"stateMutability":"view","type":"function","name":"root_implementation","inputs":[],"outputs":[{"name":"","type":"address"}]},{"stateMutability":"view","type":"function","name":"call_proxy","inputs":[],"outputs":[{"name":"","type":"address"}]},{"stateMutability":"view","type":"function","name":"gauge_data","inputs":[{"name":"arg0","type":"address"}],"outputs":[{"name":"","type":"uint256"}]},{"stateMutability":"view","type":"function","name":"minted","inputs":[{"name":"arg0","type":"address"},{"name":"arg1","type":"address"}],"outputs":[{"name":"","type":"uint256"}]},{"stateMutability":"view","type":"function","name":"get_gauge_from_lp_token","inputs":[{"name":"arg0","type":"address"}],"outputs":[{"name":"","type":"address"}]},{"stateMutability":"view","type":"function","name":"get_gauge_count","inputs":[],"outputs":[{"name":"","type":"uint256"}]},{"stateMutability":"view","type":"function","name":"get_gauge","inputs":[{"name":"arg0","type":"uint256"}],"outputs":[{"name":"","type":"address"}]}]

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0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000306a45a1478a000dc701a6e1f7a569afb8d9dcd600000000000000000000000096720942f9ff22efd8611f696e5333fe3671717a000000000000000000000000331b9182088e2a7d6d3fe4742aba1fb231aecc56000000000000000000000000ae50429025b59c9d62ae9c3a52a657bc7ab64036

-----Decoded View---------------
Arg [0] : _call_proxy (address): 0x0000000000000000000000000000000000000000
Arg [1] : _root_factory (address): 0x306A45a1478A000dC701A6e1f7a569afb8D9DCD6
Arg [2] : _root_impl (address): 0x96720942F9fF22eFd8611F696E5333Fe3671717a
Arg [3] : _crv (address): 0x331B9182088e2A7d6D3Fe4742AbA1fB231aEcc56
Arg [4] : _owner (address): 0xaE50429025B59C9D62Ae9c3A52a657BC7AB64036

-----Encoded View---------------
5 Constructor Arguments found :
Arg [0] : 0000000000000000000000000000000000000000000000000000000000000000
Arg [1] : 000000000000000000000000306a45a1478a000dc701a6e1f7a569afb8d9dcd6
Arg [2] : 00000000000000000000000096720942f9ff22efd8611f696e5333fe3671717a
Arg [3] : 000000000000000000000000331b9182088e2a7d6d3fe4742aba1fb231aecc56
Arg [4] : 000000000000000000000000ae50429025b59c9d62ae9c3a52a657bc7ab64036