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dex/{networks,testing}: Add simnet USDC
This adds the usdc.eth and usdc.polygon assets to simnet. This is useful for testing market making.
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| // SPDX-License-Identifier: MIT | ||
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| // This is a simplified version of OpenZeppelin Contracts v4.4.0 (token/ERC20/ERC20.sol). | ||
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| pragma solidity = 0.8.18; | ||
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| contract TestUSDC { | ||
| mapping(address => uint256) private _balances; | ||
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| mapping(address => mapping(address => uint256)) private _allowances; | ||
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| uint256 private _totalSupply; | ||
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| string private _name; | ||
| string private _symbol; | ||
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| /** | ||
| * @dev Sets the values for {name} and {symbol}. | ||
| * | ||
| * The default value of {decimals} is 18. To select a different value for | ||
| * {decimals} you should overload it. | ||
| * | ||
| * All two of these values are immutable: they can only be set once during | ||
| * construction. | ||
| */ | ||
| constructor() { | ||
| _name = "USD Coin"; | ||
| _symbol = "USDC"; | ||
| _totalSupply = 33000000000; | ||
| _balances[0x18D65FB8d60c1199bb1Ad381bE47aA692b482605] = 11000000000; // alpha | ||
| _balances[0x4F8eF3892B65ED7fc356fF473a2eF2aE5EC27A06] = 11000000000; // beta | ||
| _balances[0xd12aB7cf72CCf1f3882eC99DDc53CD415635C3bE] = 11000000000; // delta | ||
| } | ||
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| /** | ||
| * @dev Returns the name of the token. | ||
| */ | ||
| function name() public view virtual returns (string memory) { | ||
| return _name; | ||
| } | ||
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| /** | ||
| * @dev Returns the symbol of the token, usually a shorter version of the | ||
| * name. | ||
| */ | ||
| function symbol() public view virtual returns (string memory) { | ||
| return _symbol; | ||
| } | ||
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| /** | ||
| * @dev Returns the number of decimals used to get its user representation. | ||
| * For example, if `decimals` equals `2`, a balance of `505` tokens should | ||
| * be displayed to a user as `5.05` (`505 / 10 ** 2`). | ||
| * | ||
| * Tokens usually opt for a value of 18, imitating the relationship between | ||
| * Ether and Wei. This is the value {ERC20} uses, unless this function is | ||
| * overridden; | ||
| * | ||
| * NOTE: This information is only used for _display_ purposes: it in | ||
| * no way affects any of the arithmetic of the contract, including | ||
| * {IERC20-balanceOf} and {IERC20-transfer}. | ||
| */ | ||
| function decimals() public view virtual returns (uint8) { | ||
| return 6; | ||
| } | ||
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| /** | ||
| * @dev See {IERC20-totalSupply}. | ||
| */ | ||
| function totalSupply() public view virtual returns (uint256) { | ||
| return _totalSupply; | ||
| } | ||
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| /** | ||
| * @dev See {IERC20-balanceOf}. | ||
| */ | ||
| function balanceOf(address account) public view virtual returns (uint256) { | ||
| return _balances[account]; | ||
| } | ||
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| /** | ||
| * @dev See {IERC20-transfer}. | ||
| * | ||
| * Requirements: | ||
| * | ||
| * - `recipient` cannot be the zero address. | ||
| * - the caller must have a balance of at least `amount`. | ||
| */ | ||
| function transfer(address recipient, uint256 amount) public virtual returns (bool) { | ||
| _transfer(msg.sender, recipient, amount); | ||
| return true; | ||
| } | ||
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| /** | ||
| * @dev See {IERC20-allowance}. | ||
| */ | ||
| function allowance(address owner, address spender) public view virtual returns (uint256) { | ||
| return _allowances[owner][spender]; | ||
| } | ||
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| /** | ||
| * @dev See {IERC20-approve}. | ||
| * | ||
| * Requirements: | ||
| * | ||
| * - `spender` cannot be the zero address. | ||
| */ | ||
| function approve(address spender, uint256 amount) public virtual returns (bool) { | ||
| _approve(msg.sender, spender, amount); | ||
| return true; | ||
| } | ||
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| function testApprove(address user, address spender, uint256 amount) public returns (bool) { | ||
| _approve(user, spender, amount); | ||
| return true; | ||
| } | ||
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| /** | ||
| * @dev See {IERC20-transferFrom}. | ||
| * | ||
| * Emits an {Approval} event indicating the updated allowance. This is not | ||
| * required by the EIP. See the note at the beginning of {ERC20}. | ||
| * | ||
| * Requirements: | ||
| * | ||
| * - `sender` and `recipient` cannot be the zero address. | ||
| * - `sender` must have a balance of at least `amount`. | ||
| * - the caller must have allowance for ``sender``'s tokens of at least | ||
| * `amount`. | ||
| */ | ||
| function transferFrom( | ||
| address sender, | ||
| address recipient, | ||
| uint256 amount | ||
| ) public virtual returns (bool) { | ||
| _transfer(sender, recipient, amount); | ||
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| uint256 currentAllowance = _allowances[sender][msg.sender]; | ||
| require(currentAllowance >= amount, "ERC20: transfer amount exceeds allowance"); | ||
| unchecked { | ||
| _approve(sender, msg.sender, currentAllowance - amount); | ||
| } | ||
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| return true; | ||
| } | ||
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| /** | ||
| * Airdrop is used to mint new tokens and give them to a user. | ||
| */ | ||
| function airdrop(address recipient, uint256 amount) public virtual { | ||
| _totalSupply += amount; | ||
| _balances[recipient] += amount; | ||
| } | ||
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| /** | ||
| * @dev Moves `amount` of tokens from `sender` to `recipient`. | ||
| * | ||
| * This internal function is equivalent to {transfer}, and can be used to | ||
| * e.g. implement automatic token fees, slashing mechanisms, etc. | ||
| * | ||
| * Requirements: | ||
| * | ||
| * - `sender` cannot be the zero address. | ||
| * - `recipient` cannot be the zero address. | ||
| * - `sender` must have a balance of at least `amount`. | ||
| */ | ||
| function _transfer( | ||
| address sender, | ||
| address recipient, | ||
| uint256 amount | ||
| ) internal virtual { | ||
| require(sender != address(0), "ERC20: transfer from the zero address"); | ||
| require(recipient != address(0), "ERC20: transfer to the zero address"); | ||
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| uint256 senderBalance = _balances[sender]; | ||
| require(senderBalance >= amount, "ERC20: transfer amount exceeds balance"); | ||
| unchecked { | ||
| _balances[sender] = senderBalance - amount; | ||
| } | ||
| _balances[recipient] += amount; | ||
| } | ||
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| /** | ||
| * @dev Sets `amount` as the allowance of `spender` over the `owner` s tokens. | ||
| * | ||
| * This internal function is equivalent to `approve`, and can be used to | ||
| * e.g. set automatic allowances for certain subsystems, etc. | ||
| * | ||
| * Requirements: | ||
| * | ||
| * - `owner` cannot be the zero address. | ||
| * - `spender` cannot be the zero address. | ||
| */ | ||
| function _approve( | ||
| address owner, | ||
| address spender, | ||
| uint256 amount | ||
| ) internal virtual { | ||
| require(owner != address(0), "ERC20: approve from the zero address"); | ||
| require(spender != address(0), "ERC20: approve to the zero address"); | ||
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| _allowances[owner][spender] = amount; | ||
| } | ||
| } |
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