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Contract Source Code (Vyper language format)

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# @version 0.3.1
"""
@title Voting Escrow Delegation Proxy
@author Curve Finance
@license MIT
"""

from vyper.interfaces import ERC20


interface VeDelegation:
    def adjusted_balance_of(_account: address) -> uint256: view


event CommitAdmins:
    ownership_admin: address
    emergency_admin: address

event ApplyAdmins:
    ownership_admin: address
    emergency_admin: address

event DelegationSet:
    delegation: address

delegation: public(address)
voting_escrow: public(address)

emergency_admin: public(address)
ownership_admin: public(address)
future_emergency_admin: public(address)
future_ownership_admin: public(address)


@external
def __init__(_delegation: address, _voting_escrow: address, _o_admin: address, _e_admin: address):
    self.delegation = _delegation
    self.voting_escrow = _voting_escrow

    self.ownership_admin = _o_admin
    self.emergency_admin = _e_admin

    log DelegationSet(_delegation)


@view
@external
def adjusted_balance_of(_account: address) -> uint256:
    """
    @notice Get the adjusted veCRV balance from the active boost delegation contract
    @param _account The account to query the adjusted veCRV balance of
    @return veCRV balance
    """
    _delegation: address = self.delegation
    if _delegation == ZERO_ADDRESS:
        return ERC20(self.voting_escrow).balanceOf(_account)
    return VeDelegation(_delegation).adjusted_balance_of(_account)


@external
def kill_delegation():
    """
    @notice Set delegation contract to 0x00, disabling boost delegation
    @dev Callable by the emergency admin in case of an issue with the delegation logic
    """
    assert msg.sender in [self.ownership_admin, self.emergency_admin]

    self.delegation = ZERO_ADDRESS
    log DelegationSet(ZERO_ADDRESS)


@external
def set_delegation(_delegation: address):
    """
    @notice Set the delegation contract
    @dev Only callable by the ownership admin
    @param _delegation `VotingEscrowDelegation` deployment address
    """
    assert msg.sender == self.ownership_admin

    # call `adjusted_balance_of` to make sure it works
    VeDelegation(_delegation).adjusted_balance_of(msg.sender)

    self.delegation = _delegation
    log DelegationSet(_delegation)


@external
def commit_set_admins(_o_admin: address, _e_admin: address):
    """
    @notice Set ownership admin to `_o_admin` and emergency admin to `_e_admin`
    @param _o_admin Ownership admin
    @param _e_admin Emergency admin
    """
    assert msg.sender == self.ownership_admin, "Access denied"

    self.future_ownership_admin = _o_admin
    self.future_emergency_admin = _e_admin

    log CommitAdmins(_o_admin, _e_admin)


@external
def apply_set_admins():
    """
    @notice Apply the effects of `commit_set_admins`
    """
    assert msg.sender == self.ownership_admin, "Access denied"

    _o_admin: address = self.future_ownership_admin
    _e_admin: address = self.future_emergency_admin
    self.ownership_admin = _o_admin
    self.emergency_admin = _e_admin

    log ApplyAdmins(_o_admin, _e_admin)

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[{"name":"CommitAdmins","inputs":[{"name":"ownership_admin","type":"address","indexed":false},{"name":"emergency_admin","type":"address","indexed":false}],"anonymous":false,"type":"event"},{"name":"ApplyAdmins","inputs":[{"name":"ownership_admin","type":"address","indexed":false},{"name":"emergency_admin","type":"address","indexed":false}],"anonymous":false,"type":"event"},{"name":"DelegationSet","inputs":[{"name":"delegation","type":"address","indexed":false}],"anonymous":false,"type":"event"},{"stateMutability":"nonpayable","type":"constructor","inputs":[{"name":"_delegation","type":"address"},{"name":"_voting_escrow","type":"address"},{"name":"_o_admin","type":"address"},{"name":"_e_admin","type":"address"}],"outputs":[]},{"stateMutability":"view","type":"function","name":"adjusted_balance_of","inputs":[{"name":"_account","type":"address"}],"outputs":[{"name":"","type":"uint256"}],"gas":9686},{"stateMutability":"nonpayable","type":"function","name":"kill_delegation","inputs":[],"outputs":[],"gas":26863},{"stateMutability":"nonpayable","type":"function","name":"set_delegation","inputs":[{"name":"_delegation","type":"address"}],"outputs":[],"gas":41901},{"stateMutability":"nonpayable","type":"function","name":"commit_set_admins","inputs":[{"name":"_o_admin","type":"address"},{"name":"_e_admin","type":"address"}],"outputs":[],"gas":78289},{"stateMutability":"nonpayable","type":"function","name":"apply_set_admins","inputs":[],"outputs":[],"gas":82241},{"stateMutability":"view","type":"function","name":"delegation","inputs":[],"outputs":[{"name":"","type":"address"}],"gas":2610},{"stateMutability":"view","type":"function","name":"voting_escrow","inputs":[],"outputs":[{"name":"","type":"address"}],"gas":2640},{"stateMutability":"view","type":"function","name":"emergency_admin","inputs":[],"outputs":[{"name":"","type":"address"}],"gas":2670},{"stateMutability":"view","type":"function","name":"ownership_admin","inputs":[],"outputs":[{"name":"","type":"address"}],"gas":2700},{"stateMutability":"view","type":"function","name":"future_emergency_admin","inputs":[],"outputs":[{"name":"","type":"address"}],"gas":2730},{"stateMutability":"view","type":"function","name":"future_ownership_admin","inputs":[],"outputs":[{"name":"","type":"address"}],"gas":2760}]

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