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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,148 @@ | ||
| # @version ^0.3.9 | ||
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| """ | ||
| @notice Rebasing ERC20 mock with rebase by 1% on every transfer | ||
| @dev This is for testing only, it is NOT safe for use | ||
| @dev Based on stEth implementation | ||
| """ | ||
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| event Transfer: | ||
| _from: indexed(address) | ||
| _to: indexed(address) | ||
| _value: uint256 | ||
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| event Approval: | ||
| _owner: indexed(address) | ||
| _spender: indexed(address) | ||
| _value: uint256 | ||
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| name: public(String[64]) | ||
| symbol: public(String[32]) | ||
| decimals: public(uint256) | ||
| allowances: HashMap[address, HashMap[address, uint256]] | ||
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| # <--- Rebase Parameters ---> | ||
| totalCoin: public(uint256) | ||
| totalShares: public(uint256) | ||
| shares: public(HashMap[address, uint256]) | ||
| IS_UP: immutable(bool) | ||
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| # asset type | ||
| asset_type: public(constant(uint8)) = 2 | ||
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| @external | ||
| def __init__(_name: String[64], _symbol: String[32], _decimals: uint256, is_up: bool): | ||
| self.name = _name | ||
| self.symbol = _symbol | ||
| self.decimals = _decimals | ||
| IS_UP = is_up | ||
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| @external | ||
| @view | ||
| def totalSupply() -> uint256: | ||
| # Rebase is pegged to total pooled coin | ||
| return self.totalCoin | ||
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| @external | ||
| @view | ||
| def balanceOf(_user: address) -> uint256: | ||
| return self._get_coins_by_shares(self.shares[_user]) | ||
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| @external | ||
| @view | ||
| def allowance(_owner: address, _spender: address) -> uint256: | ||
| return self.allowances[_owner][_spender] | ||
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| @external | ||
| def transfer(_to: address, _value: uint256) -> bool: | ||
| _shares: uint256 = self._get_shares_by_coins(_value) | ||
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| self.shares[msg.sender] -= _shares | ||
| self.shares[_to] += _shares | ||
| log Transfer(msg.sender, _to, _value) | ||
| return True | ||
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| @external | ||
| def transferFrom(_from: address, _to: address, _value: uint256) -> bool: | ||
| _shares: uint256 = self._get_shares_by_coins(_value) | ||
| _shares = min(self.shares[_from], _shares) | ||
| # Value can be less than expected even if self.shares[_from] > _shares | ||
| _new_value: uint256 = self._get_coins_by_shares(_shares) | ||
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| self.shares[_from] -= _shares | ||
| self.shares[_to] += _shares | ||
| self.allowances[_from][msg.sender] -= _new_value | ||
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| log Transfer(_from, _to, _new_value) | ||
| return True | ||
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| @external | ||
| def approve(_spender: address, _value: uint256) -> bool: | ||
| self.allowances[msg.sender][_spender] = _value | ||
| log Approval(msg.sender, _spender, _value) | ||
| return True | ||
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| @internal | ||
| @view | ||
| def _share_price() -> uint256: | ||
| if self.totalShares == 0: | ||
| return 10 ** self.decimals | ||
| return self.totalCoin * 10 ** self.decimals / self.totalShares | ||
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| @internal | ||
| @view | ||
| def _get_coins_by_shares(_shares: uint256) -> uint256: | ||
| return _shares * self._share_price() / 10 ** self.decimals | ||
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| @internal | ||
| @view | ||
| def _get_shares_by_coins(_coins: uint256) -> uint256: | ||
| return _coins * 10 ** self.decimals / self._share_price() | ||
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| @external | ||
| @view | ||
| def share_price() -> uint256: | ||
| return self._share_price() | ||
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| @external | ||
| def rebase(): | ||
| if IS_UP: | ||
| self.totalCoin = self.totalCoin * 1000001 / 1000000 | ||
| else: | ||
| self.totalCoin = self.totalCoin * 999999 / 1000000 | ||
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| @external | ||
| def set_total_coin(total_coin: uint256) -> bool: | ||
| assert self.totalShares != 0, "no shares" | ||
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| self.totalCoin = total_coin | ||
| return True | ||
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| @external | ||
| def _mint_for_testing(_target: address, _value: uint256) -> bool: | ||
| _shares: uint256 = self._get_shares_by_coins(_value) | ||
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| self.totalCoin += _value | ||
| self.totalShares += _shares | ||
| self.shares[_target] += _shares | ||
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| log Transfer(empty(address), _target, _value) | ||
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| return True |
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