feat: add balancer v2 executor

foundry/lib/balancer-labs/v2-interfaces/contracts/standalone-utils/IYearnTokenVault.sol

@@ -0,0 +1,49 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+pragma solidity ^0.7.0;
+
+import "../solidity-utils/openzeppelin/IERC20.sol";
+
+interface IYearnTokenVault is IERC20 {
+    /**
+     * @dev returns the address of the vault's underlying asset (mainToken)
+     */
+    function token() external view returns (address);
+
+    /**
+     * @dev returns the price for a single Vault share (ie yvDAI). The pricePerShare is represented
+     * in the same decimals as the underlying asset (ie: 6 decimals for USDC)
+     */
+    function pricePerShare() external view returns (uint256);
+
+    /**
+     * @notice Deposits `_amount` `token`, issuing shares to `recipient`.
+     * If the Vault is in Emergency Shutdown, deposits will not be accepted and this call will fail.
+     * @param _amount The quantity of tokens to deposit, defaults to all.
+     * @param recipient The address to issue the shares in this Vault to. Defaults to the caller's address.
+     * @return The issued Vault shares.
+     */
+    function deposit(uint256 _amount, address recipient) external returns (uint256);
+
+    /**
+     * @notice Withdraws the calling account's tokens from this Vault,
+     * redeeming amount `_shares` for an appropriate amount of tokens.
+     * See note on `setWithdrawalQueue` for further details of withdrawal ordering and behavior.
+     * @param maxShares How many shares to try and redeem for tokens, defaults to all.
+     * @param recipient The address to issue the shares in this Vault to. Defaults to the caller's address.
+     * @return redeemed: The quantity of tokens redeemed for `_shares`.
+     */
+    function withdraw(uint256 maxShares, address recipient) external returns (uint256);
+}