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{
"language": "Solidity",
"sources": {
"@balancer-labs/v2-interfaces/contracts/pool-linear/IStaticAToken.sol": {
"content": "// SPDX-License-Identifier: GPL-3.0-or-later\n// This program is free software: you can redistribute it and/or modify\n// it under the terms of the GNU General Public License as published by\n// the Free Software Foundation, either version 3 of the License, or\n// (at your option) any later version.\n\n// This program is distributed in the hope that it will be useful,\n// but WITHOUT ANY WARRANTY; without even the implied warranty of\n// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the\n// GNU General Public License for more details.\n\n// You should have received a copy of the GNU General Public License\n// along with this program. If not, see <http://www.gnu.org/licenses/>.\n\npragma solidity ^0.7.0;\n\nimport \"./ILendingPool.sol\";\n\ninterface IStaticAToken {\n /**\n * @dev returns the address of the staticAToken's underlying asset\n */\n // solhint-disable-next-line func-name-mixedcase\n function ASSET() external view returns (address);\n\n /**\n * @dev returns the address of the staticAToken's lending pool\n */\n // solhint-disable-next-line func-name-mixedcase\n function LENDING_POOL() external view returns (ILendingPool);\n\n /**\n * @dev returns a 27 decimal fixed point 'ray' value so a rate of 1 is represented as 1e27\n */\n function rate() external view returns (uint256);\n\n function deposit(\n address,\n uint256,\n uint16,\n bool\n ) external returns (uint256);\n\n function withdraw(\n address,\n uint256,\n bool\n ) external returns (uint256, uint256);\n\n function staticToDynamicAmount(uint256 amount) external view returns (uint256);\n}\n"
},
"@balancer-labs/v2-interfaces/contracts/pool-linear/ILendingPool.sol": {
"content": "// SPDX-License-Identifier: GPL-3.0-or-later\n// This program is free software: you can redistribute it and/or modify\n// it under the terms of the GNU General Public License as published by\n// the Free Software Foundation, either version 3 of the License, or\n// (at your option) any later version.\n\n// This program is distributed in the hope that it will be useful,\n// but WITHOUT ANY WARRANTY; without even the implied warranty of\n// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the\n// GNU General Public License for more details.\n\n// You should have received a copy of the GNU General Public License\n// along with this program. If not, see <http://www.gnu.org/licenses/>.\n\npragma solidity ^0.7.0;\n\ninterface ILendingPool {\n /**\n * @dev returns a 27 decimal fixed point 'ray' value so a rate of 1 is represented as 1e27\n */\n function getReserveNormalizedIncome(address asset) external view returns (uint256);\n}\n"
},
"@balancer-labs/v2-interfaces/contracts/solidity-utils/helpers/BalancerErrors.sol": {
"content": "// SPDX-License-Identifier: GPL-3.0-or-later\n// This program is free software: you can redistribute it and/or modify\n// it under the terms of the GNU General Public License as published by\n// the Free Software Foundation, either version 3 of the License, or\n// (at your option) any later version.\n\n// This program is distributed in the hope that it will be useful,\n// but WITHOUT ANY WARRANTY; without even the implied warranty of\n// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the\n// GNU General Public License for more details.\n\n// You should have received a copy of the GNU General Public License\n// along with this program. If not, see <http://www.gnu.org/licenses/>.\n\npragma solidity ^0.7.0;\n\n// solhint-disable\n\n/**\n * @dev Reverts if `condition` is false, with a revert reason containing `errorCode`. Only codes up to 999 are\n * supported.\n * Uses the default 'BAL' prefix for the error code\n */\nfunction _require(bool condition, uint256 errorCode) pure {\n if (!condition) _revert(errorCode);\n}\n\n/**\n * @dev Reverts if `condition` is false, with a revert reason containing `errorCode`. Only codes up to 999 are\n * supported.\n */\nfunction _require(bool condition, uint256 errorCode, bytes3 prefix) pure {\n if (!condition) _revert(errorCode, prefix);\n}\n\n/**\n * @dev Reverts with a revert reason containing `errorCode`. Only codes up to 999 are supported.\n * Uses the default 'BAL' prefix for the error code\n */\nfunction _revert(uint256 errorCode) pure {\n _revert(errorCode, 0x42414c); // This is the raw byte representation of \"BAL\"\n}\n\n/**\n * @dev Reverts with a revert reason containing `errorCode`. Only codes up to 999 are supported.\n */\nfunction _revert(uint256 errorCode, bytes3 prefix) pure {\n uint256 prefixUint = uint256(uint24(prefix));\n // We're going to dynamically create a revert string based on the error code, with the following format:\n // 'BAL#{errorCode}'\n // where the code is left-padded with zeroes to three digits (so they range from 000 to 999).\n //\n // We don't have revert strings embedded in the contract to save bytecode size: it takes much less space to store a\n // number (8 to 16 bits) than the individual string characters.\n //\n // The dynamic string creation algorithm that follows could be implemented in Solidity, but assembly allows for a\n // much denser implementation, again saving bytecode size. Given this function unconditionally reverts, this is a\n // safe place to rely on it without worrying about how its usage might affect e.g. memory contents.\n assembly {\n // First, we need to compute the ASCII representation of the error code. We assume that it is in the 0-999\n // range, so we only need to convert three digits. To convert the digits to ASCII, we add 0x30, the value for\n // the '0' character.\n\n let units := add(mod(errorCode, 10), 0x30)\n\n errorCode := div(errorCode, 10)\n let tenths := add(mod(errorCode, 10), 0x30)\n\n errorCode := div(errorCode, 10)\n let hundreds := add(mod(errorCode, 10), 0x30)\n\n // With the individual characters, we can now construct the full string.\n // We first append the '#' character (0x23) to the prefix. In the case of 'BAL', it results in 0x42414c23 ('BAL#')\n // Then, we shift this by 24 (to provide space for the 3 bytes of the error code), and add the\n // characters to it, each shifted by a multiple of 8.\n // The revert reason is then shifted left by 200 bits (256 minus the length of the string, 7 characters * 8 bits\n // per character = 56) to locate it in the most significant part of the 256 slot (the beginning of a byte\n // array).\n let formattedPrefix := shl(24, add(0x23, shl(8, prefixUint)))\n\n let revertReason := shl(200, add(formattedPrefix, add(add(units, shl(8, tenths)), shl(16, hundreds))))\n\n // We can now encode the reason in memory, which can be safely overwritten as we're about to revert. The encoded\n // message will have the following layout:\n // [ revert reason identifier ] [ string location offset ] [ string length ] [ string contents ]\n\n // The Solidity revert reason identifier is 0x08c739a0, the function selector of the Error(string) function. We\n // also write zeroes to the next 28 bytes of memory, but those are about to be overwritten.\n mstore(0x0, 0x08c379a000000000000000000000000000000000000000000000000000000000)\n // Next is the offset to the location of the string, which will be placed immediately after (20 bytes away).\n mstore(0x04, 0x0000000000000000000000000000000000000000000000000000000000000020)\n // The string length is fixed: 7 characters.\n mstore(0x24, 7)\n // Finally, the string itself is stored.\n mstore(0x44, revertReason)\n\n // Even if the string is only 7 bytes long, we need to return a full 32 byte slot containing it. The length of\n // the encoded message is therefore 4 + 32 + 32 + 32 = 100.\n revert(0, 100)\n }\n}\n\nlibrary Errors {\n // Math\n uint256 internal constant ADD_OVERFLOW = 0;\n uint256 internal constant SUB_OVERFLOW = 1;\n uint256 internal constant SUB_UNDERFLOW = 2;\n uint256 internal constant MUL_OVERFLOW = 3;\n uint256 internal constant ZERO_DIVISION = 4;\n uint256 internal constant DIV_INTERNAL = 5;\n uint256 internal constant X_OUT_OF_BOUNDS = 6;\n uint256 internal constant Y_OUT_OF_BOUNDS = 7;\n uint256 internal constant PRODUCT_OUT_OF_BOUNDS = 8;\n uint256 internal constant INVALID_EXPONENT = 9;\n\n // Input\n uint256 internal constant OUT_OF_BOUNDS = 100;\n uint256 internal constant UNSORTED_ARRAY = 101;\n uint256 internal constant UNSORTED_TOKENS = 102;\n uint256 internal constant INPUT_LENGTH_MISMATCH = 103;\n uint256 internal constant ZERO_TOKEN = 104;\n\n // Shared pools\n uint256 internal constant MIN_TOKENS = 200;\n uint256 internal constant MAX_TOKENS = 201;\n uint256 internal constant MAX_SWAP_FEE_PERCENTAGE = 202;\n uint256 internal constant MIN_SWAP_FEE_PERCENTAGE = 203;\n uint256 internal constant MINIMUM_BPT = 204;\n uint256 internal constant CALLER_NOT_VAULT = 205;\n uint256 internal constant UNINITIALIZED = 206;\n uint256 internal constant BPT_IN_MAX_AMOUNT = 207;\n uint256 internal constant BPT_OUT_MIN_AMOUNT = 208;\n uint256 internal constant EXPIRED_PERMIT = 209;\n uint256 internal constant NOT_TWO_TOKENS = 210;\n uint256 internal constant DISABLED = 211;\n\n // Pools\n uint256 internal constant MIN_AMP = 300;\n uint256 internal constant MAX_AMP = 301;\n uint256 internal constant MIN_WEIGHT = 302;\n uint256 internal constant MAX_STABLE_TOKENS = 303;\n uint256 internal constant MAX_IN_RATIO = 304;\n uint256 internal constant MAX_OUT_RATIO = 305;\n uint256 internal constant MIN_BPT_IN_FOR_TOKEN_OUT = 306;\n uint256 internal constant MAX_OUT_BPT_FOR_TOKEN_IN = 307;\n uint256 internal constant NORMALIZED_WEIGHT_INVARIANT = 308;\n uint256 internal constant INVALID_TOKEN = 309;\n uint256 internal constant UNHANDLED_JOIN_KIND = 310;\n uint256 internal constant ZERO_INVARIANT = 311;\n uint256 internal constant ORACLE_INVALID_SECONDS_QUERY = 312;\n uint256 internal constant ORACLE_NOT_INITIALIZED = 313;\n uint256 internal constant ORACLE_QUERY_TOO_OLD = 314;\n uint256 internal constant ORACLE_INVALID_INDEX = 315;\n uint256 internal constant ORACLE_BAD_SECS = 316;\n uint256 internal constant AMP_END_TIME_TOO_CLOSE = 317;\n uint256 internal constant AMP_ONGOING_UPDATE = 318;\n uint256 internal constant AMP_RATE_TOO_HIGH = 319;\n uint256 internal constant AMP_NO_ONGOING_UPDATE = 320;\n uint256 internal constant STABLE_INVARIANT_DIDNT_CONVERGE = 321;\n uint256 internal constant STABLE_GET_BALANCE_DIDNT_CONVERGE = 322;\n uint256 internal constant RELAYER_NOT_CONTRACT = 323;\n uint256 internal constant BASE_POOL_RELAYER_NOT_CALLED = 324;\n uint256 internal constant REBALANCING_RELAYER_REENTERED = 325;\n uint256 internal constant GRADUAL_UPDATE_TIME_TRAVEL = 326;\n uint256 internal constant SWAPS_DISABLED = 327;\n uint256 internal constant CALLER_IS_NOT_LBP_OWNER = 328;\n uint256 internal constant PRICE_RATE_OVERFLOW = 329;\n uint256 internal constant INVALID_JOIN_EXIT_KIND_WHILE_SWAPS_DISABLED = 330;\n uint256 internal constant WEIGHT_CHANGE_TOO_FAST = 331;\n uint256 internal constant LOWER_GREATER_THAN_UPPER_TARGET = 332;\n uint256 internal constant UPPER_TARGET_TOO_HIGH = 333;\n uint256 internal constant UNHANDLED_BY_LINEAR_POOL = 334;\n uint256 internal constant OUT_OF_TARGET_RANGE = 335;\n uint256 internal constant UNHANDLED_EXIT_KIND = 336;\n uint256 internal constant UNAUTHORIZED_EXIT = 337;\n uint256 internal constant MAX_MANAGEMENT_SWAP_FEE_PERCENTAGE = 338;\n uint256 internal constant UNHANDLED_BY_MANAGED_POOL = 339;\n uint256 internal constant UNHANDLED_BY_PHANTOM_POOL = 340;\n uint256 internal constant TOKEN_DOES_NOT_HAVE_RATE_PROVIDER = 341;\n uint256 internal constant INVALID_INITIALIZATION = 342;\n uint256 internal constant OUT_OF_NEW_TARGET_RANGE = 343;\n uint256 internal constant FEATURE_DISABLED = 344;\n uint256 internal constant UNINITIALIZED_POOL_CONTROLLER = 345;\n uint256 internal constant SET_SWAP_FEE_DURING_FEE_CHANGE = 346;\n uint256 internal constant SET_SWAP_FEE_PENDING_FEE_CHANGE = 347;\n uint256 internal constant CHANGE_TOKENS_DURING_WEIGHT_CHANGE = 348;\n uint256 internal constant CHANGE_TOKENS_PENDING_WEIGHT_CHANGE = 349;\n uint256 internal constant MAX_WEIGHT = 350;\n uint256 internal constant UNAUTHORIZED_JOIN = 351;\n uint256 internal constant MAX_MANAGEMENT_AUM_FEE_PERCENTAGE = 352;\n uint256 internal constant FRACTIONAL_TARGET = 353;\n\n // Lib\n uint256 internal constant REENTRANCY = 400;\n uint256 internal constant SENDER_NOT_ALLOWED = 401;\n uint256 internal constant PAUSED = 402;\n uint256 internal constant PAUSE_WINDOW_EXPIRED = 403;\n uint256 internal constant MAX_PAUSE_WINDOW_DURATION = 404;\n uint256 internal constant MAX_BUFFER_PERIOD_DURATION = 405;\n uint256 internal constant INSUFFICIENT_BALANCE = 406;\n uint256 internal constant INSUFFICIENT_ALLOWANCE = 407;\n uint256 internal constant ERC20_TRANSFER_FROM_ZERO_ADDRESS = 408;\n uint256 internal constant ERC20_TRANSFER_TO_ZERO_ADDRESS = 409;\n uint256 internal constant ERC20_MINT_TO_ZERO_ADDRESS = 410;\n uint256 internal constant ERC20_BURN_FROM_ZERO_ADDRESS = 411;\n uint256 internal constant ERC20_APPROVE_FROM_ZERO_ADDRESS = 412;\n uint256 internal constant ERC20_APPROVE_TO_ZERO_ADDRESS = 413;\n uint256 internal constant ERC20_TRANSFER_EXCEEDS_ALLOWANCE = 414;\n uint256 internal constant ERC20_DECREASED_ALLOWANCE_BELOW_ZERO = 415;\n uint256 internal constant ERC20_TRANSFER_EXCEEDS_BALANCE = 416;\n uint256 internal constant ERC20_BURN_EXCEEDS_ALLOWANCE = 417;\n uint256 internal constant SAFE_ERC20_CALL_FAILED = 418;\n uint256 internal constant ADDRESS_INSUFFICIENT_BALANCE = 419;\n uint256 internal constant ADDRESS_CANNOT_SEND_VALUE = 420;\n uint256 internal constant SAFE_CAST_VALUE_CANT_FIT_INT256 = 421;\n uint256 internal constant GRANT_SENDER_NOT_ADMIN = 422;\n uint256 internal constant REVOKE_SENDER_NOT_ADMIN = 423;\n uint256 internal constant RENOUNCE_SENDER_NOT_ALLOWED = 424;\n uint256 internal constant BUFFER_PERIOD_EXPIRED = 425;\n uint256 internal constant CALLER_IS_NOT_OWNER = 426;\n uint256 internal constant NEW_OWNER_IS_ZERO = 427;\n uint256 internal constant CODE_DEPLOYMENT_FAILED = 428;\n uint256 internal constant CALL_TO_NON_CONTRACT = 429;\n uint256 internal constant LOW_LEVEL_CALL_FAILED = 430;\n uint256 internal constant NOT_PAUSED = 431;\n uint256 internal constant ADDRESS_ALREADY_ALLOWLISTED = 432;\n uint256 internal constant ADDRESS_NOT_ALLOWLISTED = 433;\n uint256 internal constant ERC20_BURN_EXCEEDS_BALANCE = 434;\n uint256 internal constant INVALID_OPERATION = 435;\n uint256 internal constant CODEC_OVERFLOW = 436;\n uint256 internal constant IN_RECOVERY_MODE = 437;\n uint256 internal constant NOT_IN_RECOVERY_MODE = 438;\n uint256 internal constant INDUCED_FAILURE = 439;\n uint256 internal constant EXPIRED_SIGNATURE = 440;\n uint256 internal constant MALFORMED_SIGNATURE = 441;\n uint256 internal constant SAFE_CAST_VALUE_CANT_FIT_UINT64 = 442;\n uint256 internal constant UNHANDLED_FEE_TYPE = 443;\n\n // Vault\n uint256 internal constant INVALID_POOL_ID = 500;\n uint256 internal constant CALLER_NOT_POOL = 501;\n uint256 internal constant SENDER_NOT_ASSET_MANAGER = 502;\n uint256 internal constant USER_DOESNT_ALLOW_RELAYER = 503;\n uint256 internal constant INVALID_SIGNATURE = 504;\n uint256 internal constant EXIT_BELOW_MIN = 505;\n uint256 internal constant JOIN_ABOVE_MAX = 506;\n uint256 internal constant SWAP_LIMIT = 507;\n uint256 internal constant SWAP_DEADLINE = 508;\n uint256 internal constant CANNOT_SWAP_SAME_TOKEN = 509;\n uint256 internal constant UNKNOWN_AMOUNT_IN_FIRST_SWAP = 510;\n uint256 internal constant MALCONSTRUCTED_MULTIHOP_SWAP = 511;\n uint256 internal constant INTERNAL_BALANCE_OVERFLOW = 512;\n uint256 internal constant INSUFFICIENT_INTERNAL_BALANCE = 513;\n uint256 internal constant INVALID_ETH_INTERNAL_BALANCE = 514;\n uint256 internal constant INVALID_POST_LOAN_BALANCE = 515;\n uint256 internal constant INSUFFICIENT_ETH = 516;\n uint256 internal constant UNALLOCATED_ETH = 517;\n uint256 internal constant ETH_TRANSFER = 518;\n uint256 internal constant CANNOT_USE_ETH_SENTINEL = 519;\n uint256 internal constant TOKENS_MISMATCH = 520;\n uint256 internal constant TOKEN_NOT_REGISTERED = 521;\n uint256 internal constant TOKEN_ALREADY_REGISTERED = 522;\n uint256 internal constant TOKENS_ALREADY_SET = 523;\n uint256 internal constant TOKENS_LENGTH_MUST_BE_2 = 524;\n uint256 internal constant NONZERO_TOKEN_BALANCE = 525;\n uint256 internal constant BALANCE_TOTAL_OVERFLOW = 526;\n uint256 internal constant POOL_NO_TOKENS = 527;\n uint256 internal constant INSUFFICIENT_FLASH_LOAN_BALANCE = 528;\n\n // Fees\n uint256 internal constant SWAP_FEE_PERCENTAGE_TOO_HIGH = 600;\n uint256 internal constant FLASH_LOAN_FEE_PERCENTAGE_TOO_HIGH = 601;\n uint256 internal constant INSUFFICIENT_FLASH_LOAN_FEE_AMOUNT = 602;\n uint256 internal constant AUM_FEE_PERCENTAGE_TOO_HIGH = 603;\n\n // Misc\n uint256 internal constant UNIMPLEMENTED = 998;\n uint256 internal constant SHOULD_NOT_HAPPEN = 999;\n}\n"
},
"@balancer-labs/v2-interfaces/contracts/pool-linear/ILinearPool.sol": {
"content": "// SPDX-License-Identifier: GPL-3.0-or-later\n// This program is free software: you can redistribute it and/or modify\n// it under the terms of the GNU General Public License as published by\n// the Free Software Foundation, either version 3 of the License, or\n// (at your option) any later version.\n\n// This program is distributed in the hope that it will be useful,\n// but WITHOUT ANY WARRANTY; without even the implied warranty of\n// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the\n// GNU General Public License for more details.\n\n// You should have received a copy of the GNU General Public License\n// along with this program. If not, see <http://www.gnu.org/licenses/>.\n\npragma solidity ^0.7.0;\npragma experimental ABIEncoderV2;\n\nimport \"../solidity-utils/openzeppelin/IERC20.sol\";\nimport \"../vault/IBasePool.sol\";\n\ninterface ILinearPool is IBasePool {\n /**\n * @dev Returns the Pool's main token.\n */\n function getMainToken() external view returns (IERC20);\n\n /**\n * @dev Returns the Pool's wrapped token.\n */\n function getWrappedToken() external view returns (IERC20);\n\n /**\n * @dev Returns the index of the Pool's BPT in the Pool tokens array (as returned by IVault.getPoolTokens).\n */\n function getBptIndex() external view returns (uint256);\n\n /**\n * @dev Returns the index of the Pool's main token in the Pool tokens array (as returned by IVault.getPoolTokens).\n */\n function getMainIndex() external view returns (uint256);\n\n /**\n * @dev Returns the index of the Pool's wrapped token in the Pool tokens array (as returned by\n * IVault.getPoolTokens).\n */\n function getWrappedIndex() external view returns (uint256);\n\n /**\n * @dev Returns the Pool's targets for the main token balance. These values have had the main token's scaling\n * factor applied to them.\n */\n function getTargets() external view returns (uint256 lowerTarget, uint256 upperTarget);\n}\n"
},
"@balancer-labs/v2-solidity-utils/contracts/math/FixedPoint.sol": {
"content": "// SPDX-License-Identifier: GPL-3.0-or-later\n// This program is free software: you can redistribute it and/or modify\n// it under the terms of the GNU General Public License as published by\n// the Free Software Foundation, either version 3 of the License, or\n// (at your option) any later version.\n\n// This program is distributed in the hope that it will be useful,\n// but WITHOUT ANY WARRANTY; without even the implied warranty of\n// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the\n// GNU General Public License for more details.\n\n// You should have received a copy of the GNU General Public License\n// along with this program. If not, see <http://www.gnu.org/licenses/>.\n\npragma solidity ^0.7.0;\n\nimport \"@balancer-labs/v2-interfaces/contracts/solidity-utils/helpers/BalancerErrors.sol\";\n\nimport \"./LogExpMath.sol\";\n\n/* solhint-disable private-vars-leading-underscore */\n\nlibrary FixedPoint {\n uint256 internal constant ONE = 1e18; // 18 decimal places\n uint256 internal constant TWO = 2 * ONE;\n uint256 internal constant FOUR = 4 * ONE;\n uint256 internal constant MAX_POW_RELATIVE_ERROR = 10000; // 10^(-14)\n\n // Minimum base for the power function when the exponent is 'free' (larger than ONE).\n uint256 internal constant MIN_POW_BASE_FREE_EXPONENT = 0.7e18;\n\n function add(uint256 a, uint256 b) internal pure returns (uint256) {\n // Fixed Point addition is the same as regular checked addition\n\n uint256 c = a + b;\n _require(c >= a, Errors.ADD_OVERFLOW);\n return c;\n }\n\n function sub(uint256 a, uint256 b) internal pure returns (uint256) {\n // Fixed Point addition is the same as regular checked addition\n\n _require(b <= a, Errors.SUB_OVERFLOW);\n uint256 c = a - b;\n return c;\n }\n\n function mulDown(uint256 a, uint256 b) internal pure returns (uint256) {\n uint256 product = a * b;\n _require(a == 0 || product / a == b, Errors.MUL_OVERFLOW);\n\n return product / ONE;\n }\n\n function mulUp(uint256 a, uint256 b) internal pure returns (uint256) {\n uint256 product = a * b;\n _require(a == 0 || product / a == b, Errors.MUL_OVERFLOW);\n\n if (product == 0) {\n return 0;\n } else {\n // The traditional divUp formula is:\n // divUp(x, y) := (x + y - 1) / y\n // To avoid intermediate overflow in the addition, we distribute the division and get:\n // divUp(x, y) := (x - 1) / y + 1\n // Note that this requires x != 0, which we already tested for.\n\n return ((product - 1) / ONE) + 1;\n }\n }\n\n function divDown(uint256 a, uint256 b) internal pure returns (uint256) {\n _require(b != 0, Errors.ZERO_DIVISION);\n\n if (a == 0) {\n return 0;\n } else {\n uint256 aInflated = a * ONE;\n _require(aInflated / a == ONE, Errors.DIV_INTERNAL); // mul overflow\n\n return aInflated / b;\n }\n }\n\n function divUp(uint256 a, uint256 b) internal pure returns (uint256) {\n _require(b != 0, Errors.ZERO_DIVISION);\n\n if (a == 0) {\n return 0;\n } else {\n uint256 aInflated = a * ONE;\n _require(aInflated / a == ONE, Errors.DIV_INTERNAL); // mul overflow\n\n // The traditional divUp formula is:\n // divUp(x, y) := (x + y - 1) / y\n // To avoid intermediate overflow in the addition, we distribute the division and get:\n // divUp(x, y) := (x - 1) / y + 1\n // Note that this requires x != 0, which we already tested for.\n\n return ((aInflated - 1) / b) + 1;\n }\n }\n\n /**\n * @dev Returns x^y, assuming both are fixed point numbers, rounding down. The result is guaranteed to not be above\n * the true value (that is, the error function expected - actual is always positive).\n */\n function powDown(uint256 x, uint256 y) internal pure returns (uint256) {\n // Optimize for when y equals 1.0, 2.0 or 4.0, as those are very simple to implement and occur often in 50/50\n // and 80/20 Weighted Pools\n if (y == ONE) {\n return x;\n } else if (y == TWO) {\n return mulDown(x, x);\n } else if (y == FOUR) {\n uint256 square = mulDown(x, x);\n return mulDown(square, square);\n } else {\n uint256 raw = LogExpMath.pow(x, y);\n uint256 maxError = add(mulUp(raw, MAX_POW_RELATIVE_ERROR), 1);\n\n if (raw < maxError) {\n return 0;\n } else {\n return sub(raw, maxError);\n }\n }\n }\n\n /**\n * @dev Returns x^y, assuming both are fixed point numbers, rounding up. The result is guaranteed to not be below\n * the true value (that is, the error function expected - actual is always negative).\n */\n function powUp(uint256 x, uint256 y) internal pure returns (uint256) {\n // Optimize for when y equals 1.0, 2.0 or 4.0, as those are very simple to implement and occur often in 50/50\n // and 80/20 Weighted Pools\n if (y == ONE) {\n return x;\n } else if (y == TWO) {\n return mulUp(x, x);\n } else if (y == FOUR) {\n uint256 square = mulUp(x, x);\n return mulUp(square, square);\n } else {\n uint256 raw = LogExpMath.pow(x, y);\n uint256 maxError = add(mulUp(raw, MAX_POW_RELATIVE_ERROR), 1);\n\n return add(raw, maxError);\n }\n }\n\n /**\n * @dev Returns the complement of a value (1 - x), capped to 0 if x is larger than 1.\n *\n * Useful when computing the complement for values with some level of relative error, as it strips this error and\n * prevents intermediate negative values.\n */\n function complement(uint256 x) internal pure returns (uint256) {\n return (x < ONE) ? (ONE - x) : 0;\n }\n}\n"
},
"@balancer-labs/v2-interfaces/contracts/solidity-utils/openzeppelin/IERC20.sol": {
"content": "// SPDX-License-Identifier: MIT\n\npragma solidity ^0.7.0;\n\n/**\n * @dev Interface of the ERC20 standard as defined in the EIP.\n */\ninterface IERC20 {\n /**\n * @dev Returns the amount of tokens in existence.\n */\n function totalSupply() external view returns (uint256);\n\n /**\n * @dev Returns the amount of tokens owned by `account`.\n */\n function balanceOf(address account) external view returns (uint256);\n\n /**\n * @dev Moves `amount` tokens from the caller's account to `recipient`.\n *\n * Returns a boolean value indicating whether the operation succeeded.\n *\n * Emits a {Transfer} event.\n */\n function transfer(address recipient, uint256 amount) external returns (bool);\n\n /**\n * @dev Returns the remaining number of tokens that `spender` will be\n * allowed to spend on behalf of `owner` through {transferFrom}. This is\n * zero by default.\n *\n * This value changes when {approve} or {transferFrom} are called.\n */\n function allowance(address owner, address spender) external view returns (uint256);\n\n /**\n * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.\n *\n * Returns a boolean value indicating whether the operation succeeded.\n *\n * IMPORTANT: Beware that changing an allowance with this method brings the risk\n * that someone may use both the old and the new allowance by unfortunate\n * transaction ordering. One possible solution to mitigate this race\n * condition is to first reduce the spender's allowance to 0 and set the\n * desired value afterwards:\n * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729\n *\n * Emits an {Approval} event.\n */\n function approve(address spender, uint256 amount) external returns (bool);\n\n /**\n * @dev Moves `amount` tokens from `sender` to `recipient` using the\n * allowance mechanism. `amount` is then deducted from the caller's\n * allowance.\n *\n * Returns a boolean value indicating whether the operation succeeded.\n *\n * Emits a {Transfer} event.\n */\n function transferFrom(\n address sender,\n address recipient,\n uint256 amount\n ) external returns (bool);\n\n /**\n * @dev Emitted when `value` tokens are moved from one account (`from`) to\n * another (`to`).\n *\n * Note that `value` may be zero.\n */\n event Transfer(address indexed from, address indexed to, uint256 value);\n\n /**\n * @dev Emitted when the allowance of a `spender` for an `owner` is set by\n * a call to {approve}. `value` is the new allowance.\n */\n event Approval(address indexed owner, address indexed spender, uint256 value);\n}\n"
},
"@balancer-labs/v2-interfaces/contracts/vault/IBasePool.sol": {
"content": "// SPDX-License-Identifier: GPL-3.0-or-later\n// This program is free software: you can redistribute it and/or modify\n// it under the terms of the GNU General Public License as published by\n// the Free Software Foundation, either version 3 of the License, or\n// (at your option) any later version.\n\n// This program is distributed in the hope that it will be useful,\n// but WITHOUT ANY WARRANTY; without even the implied warranty of\n// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the\n// GNU General Public License for more details.\n\n// You should have received a copy of the GNU General Public License\n// along with this program. If not, see <http://www.gnu.org/licenses/>.\n\npragma solidity ^0.7.0;\npragma experimental ABIEncoderV2;\n\nimport \"./IVault.sol\";\nimport \"./IPoolSwapStructs.sol\";\n\n/**\n * @dev Interface for adding and removing liquidity that all Pool contracts should implement. Note that this is not\n * the complete Pool contract interface, as it is missing the swap hooks. Pool contracts should also inherit from\n * either IGeneralPool or IMinimalSwapInfoPool\n */\ninterface IBasePool is IPoolSwapStructs {\n /**\n * @dev Called by the Vault when a user calls `IVault.joinPool` to add liquidity to this Pool. Returns how many of\n * each registered token the user should provide, as well as the amount of protocol fees the Pool owes to the Vault.\n * The Vault will then take tokens from `sender` and add them to the Pool's balances, as well as collect\n * the reported amount in protocol fees, which the pool should calculate based on `protocolSwapFeePercentage`.\n *\n * Protocol fees are reported and charged on join events so that the Pool is free of debt whenever new users join.\n *\n * `sender` is the account performing the join (from which tokens will be withdrawn), and `recipient` is the account\n * designated to receive any benefits (typically pool shares). `balances` contains the total balances\n * for each token the Pool registered in the Vault, in the same order that `IVault.getPoolTokens` would return.\n *\n * `lastChangeBlock` is the last block in which *any* of the Pool's registered tokens last changed its total\n * balance.\n *\n * `userData` contains any pool-specific instructions needed to perform the calculations, such as the type of\n * join (e.g., proportional given an amount of pool shares, single-asset, multi-asset, etc.)\n *\n * Contracts implementing this function should check that the caller is indeed the Vault before performing any\n * state-changing operations, such as minting pool shares.\n */\n function onJoinPool(\n bytes32 poolId,\n address sender,\n address recipient,\n uint256[] memory balances,\n uint256 lastChangeBlock,\n uint256 protocolSwapFeePercentage,\n bytes memory userData\n ) external returns (uint256[] memory amountsIn, uint256[] memory dueProtocolFeeAmounts);\n\n /**\n * @dev Called by the Vault when a user calls `IVault.exitPool` to remove liquidity from this Pool. Returns how many\n * tokens the Vault should deduct from the Pool's balances, as well as the amount of protocol fees the Pool owes\n * to the Vault. The Vault will then take tokens from the Pool's balances and send them to `recipient`,\n * as well as collect the reported amount in protocol fees, which the Pool should calculate based on\n * `protocolSwapFeePercentage`.\n *\n * Protocol fees are charged on exit events to guarantee that users exiting the Pool have paid their share.\n *\n * `sender` is the account performing the exit (typically the pool shareholder), and `recipient` is the account\n * to which the Vault will send the proceeds. `balances` contains the total token balances for each token\n * the Pool registered in the Vault, in the same order that `IVault.getPoolTokens` would return.\n *\n * `lastChangeBlock` is the last block in which *any* of the Pool's registered tokens last changed its total\n * balance.\n *\n * `userData` contains any pool-specific instructions needed to perform the calculations, such as the type of\n * exit (e.g., proportional given an amount of pool shares, single-asset, multi-asset, etc.)\n *\n * Contracts implementing this function should check that the caller is indeed the Vault before performing any\n * state-changing operations, such as burning pool shares.\n */\n function onExitPool(\n bytes32 poolId,\n address sender,\n address recipient,\n uint256[] memory balances,\n uint256 lastChangeBlock,\n uint256 protocolSwapFeePercentage,\n bytes memory userData\n ) external returns (uint256[] memory amountsOut, uint256[] memory dueProtocolFeeAmounts);\n\n /**\n * @dev Returns this Pool's ID, used when interacting with the Vault (to e.g. join the Pool or swap with it).\n */\n function getPoolId() external view returns (bytes32);\n\n /**\n * @dev Returns the current swap fee percentage as a 18 decimal fixed point number, so e.g. 1e17 corresponds to a\n * 10% swap fee.\n */\n function getSwapFeePercentage() external view returns (uint256);\n\n /**\n * @dev Returns the scaling factors of each of the Pool's tokens. This is an implementation detail that is typically\n * not relevant for outside parties, but which might be useful for some types of Pools.\n */\n function getScalingFactors() external view returns (uint256[] memory);\n\n function queryJoin(\n bytes32 poolId,\n address sender,\n address recipient,\n uint256[] memory balances,\n uint256 lastChangeBlock,\n uint256 protocolSwapFeePercentage,\n bytes memory userData\n ) external returns (uint256 bptOut, uint256[] memory amountsIn);\n\n function queryExit(\n bytes32 poolId,\n address sender,\n address recipient,\n uint256[] memory balances,\n uint256 lastChangeBlock,\n uint256 protocolSwapFeePercentage,\n bytes memory userData\n ) external returns (uint256 bptIn, uint256[] memory amountsOut);\n}\n"
},
"@balancer-labs/v2-interfaces/contracts/vault/IVault.sol": {
"content": "// SPDX-License-Identifier: GPL-3.0-or-later\n// This program is free software: you can redistribute it and/or modify\n// it under the terms of the GNU General Public License as published by\n// the Free Software Foundation, either version 3 of the License, or\n// (at your option) any later version.\n\n// This program is distributed in the hope that it will be useful,\n// but WITHOUT ANY WARRANTY; without even the implied warranty of\n// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the\n// GNU General Public License for more details.\n\n// You should have received a copy of the GNU General Public License\n// along with this program. If not, see <http://www.gnu.org/licenses/>.\n\npragma experimental ABIEncoderV2;\n\nimport \"../solidity-utils/openzeppelin/IERC20.sol\";\nimport \"../solidity-utils/helpers/IAuthentication.sol\";\nimport \"../solidity-utils/helpers/ISignaturesValidator.sol\";\nimport \"../solidity-utils/helpers/ITemporarilyPausable.sol\";\nimport \"../solidity-utils/misc/IWETH.sol\";\n\nimport \"./IAsset.sol\";\nimport \"./IAuthorizer.sol\";\nimport \"./IFlashLoanRecipient.sol\";\nimport \"./IProtocolFeesCollector.sol\";\n\npragma solidity ^0.7.0;\n\n/**\n * @dev Full external interface for the Vault core contract - no external or public methods exist in the contract that\n * don't override one of these declarations.\n */\ninterface IVault is ISignaturesValidator, ITemporarilyPausable, IAuthentication {\n // Generalities about the Vault:\n //\n // - Whenever documentation refers to 'tokens', it strictly refers to ERC20-compliant token contracts. Tokens are\n // transferred out of the Vault by calling the `IERC20.transfer` function, and transferred in by calling\n // `IERC20.transferFrom`. In these cases, the sender must have previously allowed the Vault to use their tokens by\n // calling `IERC20.approve`. The only deviation from the ERC20 standard that is supported is functions not returning\n // a boolean value: in these scenarios, a non-reverting call is assumed to be successful.\n //\n // - All non-view functions in the Vault are non-reentrant: calling them while another one is mid-execution (e.g.\n // while execution control is transferred to a token contract during a swap) will result in a revert. View\n // functions can be called in a re-reentrant way, but doing so might cause them to return inconsistent results.\n // Contracts calling view functions in the Vault must make sure the Vault has not already been entered.\n //\n // - View functions revert if referring to either unregistered Pools, or unregistered tokens for registered Pools.\n\n // Authorizer\n //\n // Some system actions are permissioned, like setting and collecting protocol fees. This permissioning system exists\n // outside of the Vault in the Authorizer contract: the Vault simply calls the Authorizer to check if the caller\n // can perform a given action.\n\n /**\n * @dev Returns the Vault's Authorizer.\n */\n function getAuthorizer() external view returns (IAuthorizer);\n\n /**\n * @dev Sets a new Authorizer for the Vault. The caller must be allowed by the current Authorizer to do this.\n *\n * Emits an `AuthorizerChanged` event.\n */\n function setAuthorizer(IAuthorizer newAuthorizer) external;\n\n /**\n * @dev Emitted when a new authorizer is set by `setAuthorizer`.\n */\n event AuthorizerChanged(IAuthorizer indexed newAuthorizer);\n\n // Relayers\n //\n // Additionally, it is possible for an account to perform certain actions on behalf of another one, using their\n // Vault ERC20 allowance and Internal Balance. These accounts are said to be 'relayers' for these Vault functions,\n // and are expected to be smart contracts with sound authentication mechanisms. For an account to be able to wield\n // this power, two things must occur:\n // - The Authorizer must grant the account the permission to be a relayer for the relevant Vault function. This\n // means that Balancer governance must approve each individual contract to act as a relayer for the intended\n // functions.\n // - Each user must approve the relayer to act on their behalf.\n // This double protection means users cannot be tricked into approving malicious relayers (because they will not\n // have been allowed by the Authorizer via governance), nor can malicious relayers approved by a compromised\n // Authorizer or governance drain user funds, since they would also need to be approved by each individual user.\n\n /**\n * @dev Returns true if `user` has approved `relayer` to act as a relayer for them.\n */\n function hasApprovedRelayer(address user, address relayer) external view returns (bool);\n\n /**\n * @dev Allows `relayer` to act as a relayer for `sender` if `approved` is true, and disallows it otherwise.\n *\n * Emits a `RelayerApprovalChanged` event.\n */\n function setRelayerApproval(\n address sender,\n address relayer,\n bool approved\n ) external;\n\n /**\n * @dev Emitted every time a relayer is approved or disapproved by `setRelayerApproval`.\n */\n event RelayerApprovalChanged(address indexed relayer, address indexed sender, bool approved);\n\n // Internal Balance\n //\n // Users can deposit tokens into the Vault, where they are allocated to their Internal Balance, and later\n // transferred or withdrawn. It can also be used as a source of tokens when joining Pools, as a destination\n // when exiting them, and as either when performing swaps. This usage of Internal Balance results in greatly reduced\n // gas costs when compared to relying on plain ERC20 transfers, leading to large savings for frequent users.\n //\n // Internal Balance management features batching, which means a single contract call can be used to perform multiple\n // operations of different kinds, with different senders and recipients, at once.\n\n /**\n * @dev Returns `user`'s Internal Balance for a set of tokens.\n */\n function getInternalBalance(address user, IERC20[] memory tokens) external view returns (uint256[] memory);\n\n /**\n * @dev Performs a set of user balance operations, which involve Internal Balance (deposit, withdraw or transfer)\n * and plain ERC20 transfers using the Vault's allowance. This last feature is particularly useful for relayers, as\n * it lets integrators reuse a user's Vault allowance.\n *\n * For each operation, if the caller is not `sender`, it must be an authorized relayer for them.\n */\n function manageUserBalance(UserBalanceOp[] memory ops) external payable;\n\n /**\n * @dev Data for `manageUserBalance` operations, which include the possibility for ETH to be sent and received\n without manual WETH wrapping or unwrapping.\n */\n struct UserBalanceOp {\n UserBalanceOpKind kind;\n IAsset asset;\n uint256 amount;\n address sender;\n address payable recipient;\n }\n\n // There are four possible operations in `manageUserBalance`:\n //\n // - DEPOSIT_INTERNAL\n // Increases the Internal Balance of the `recipient` account by transferring tokens from the corresponding\n // `sender`. The sender must have allowed the Vault to use their tokens via `IERC20.approve()`.\n //\n // ETH can be used by passing the ETH sentinel value as the asset and forwarding ETH in the call: it will be wrapped\n // and deposited as WETH. Any ETH amount remaining will be sent back to the caller (not the sender, which is\n // relevant for relayers).\n //\n // Emits an `InternalBalanceChanged` event.\n //\n //\n // - WITHDRAW_INTERNAL\n // Decreases the Internal Balance of the `sender` account by transferring tokens to the `recipient`.\n //\n // ETH can be used by passing the ETH sentinel value as the asset. This will deduct WETH instead, unwrap it and send\n // it to the recipient as ETH.\n //\n // Emits an `InternalBalanceChanged` event.\n //\n //\n // - TRANSFER_INTERNAL\n // Transfers tokens from the Internal Balance of the `sender` account to the Internal Balance of `recipient`.\n //\n // Reverts if the ETH sentinel value is passed.\n //\n // Emits an `InternalBalanceChanged` event.\n //\n //\n // - TRANSFER_EXTERNAL\n // Transfers tokens from `sender` to `recipient`, using the Vault's ERC20 allowance. This is typically used by\n // relayers, as it lets them reuse a user's Vault allowance.\n //\n // Reverts if the ETH sentinel value is passed.\n //\n // Emits an `ExternalBalanceTransfer` event.\n\n enum UserBalanceOpKind { DEPOSIT_INTERNAL, WITHDRAW_INTERNAL, TRANSFER_INTERNAL, TRANSFER_EXTERNAL }\n\n /**\n * @dev Emitted when a user's Internal Balance changes, either from calls to `manageUserBalance`, or through\n * interacting with Pools using Internal Balance.\n *\n * Because Internal Balance works exclusively with ERC20 tokens, ETH deposits and withdrawals will use the WETH\n * address.\n */\n event InternalBalanceChanged(address indexed user, IERC20 indexed token, int256 delta);\n\n /**\n * @dev Emitted when a user's Vault ERC20 allowance is used by the Vault to transfer tokens to an external account.\n */\n event ExternalBalanceTransfer(IERC20 indexed token, address indexed sender, address recipient, uint256 amount);\n\n // Pools\n //\n // There are three specialization settings for Pools, which allow for cheaper swaps at the cost of reduced\n // functionality:\n //\n // - General: no specialization, suited for all Pools. IGeneralPool is used for swap request callbacks, passing the\n // balance of all tokens in the Pool. These Pools have the largest swap costs (because of the extra storage reads),\n // which increase with the number of registered tokens.\n //\n // - Minimal Swap Info: IMinimalSwapInfoPool is used instead of IGeneralPool, which saves gas by only passing the\n // balance of the two tokens involved in the swap. This is suitable for some pricing algorithms, like the weighted\n // constant product one popularized by Balancer V1. Swap costs are smaller compared to general Pools, and are\n // independent of the number of registered tokens.\n //\n // - Two Token: only allows two tokens to be registered. This achieves the lowest possible swap gas cost. Like\n // minimal swap info Pools, these are called via IMinimalSwapInfoPool.\n\n enum PoolSpecialization { GENERAL, MINIMAL_SWAP_INFO, TWO_TOKEN }\n\n /**\n * @dev Registers the caller account as a Pool with a given specialization setting. Returns the Pool's ID, which\n * is used in all Pool-related functions. Pools cannot be deregistered, nor can the Pool's specialization be\n * changed.\n *\n * The caller is expected to be a smart contract that implements either `IGeneralPool` or `IMinimalSwapInfoPool`,\n * depending on the chosen specialization setting. This contract is known as the Pool's contract.\n *\n * Note that the same contract may register itself as multiple Pools with unique Pool IDs, or in other words,\n * multiple Pools may share the same contract.\n *\n * Emits a `PoolRegistered` event.\n */\n function registerPool(PoolSpecialization specialization) external returns (bytes32);\n\n /**\n * @dev Emitted when a Pool is registered by calling `registerPool`.\n */\n event PoolRegistered(bytes32 indexed poolId, address indexed poolAddress, PoolSpecialization specialization);\n\n /**\n * @dev Returns a Pool's contract address and specialization setting.\n */\n function getPool(bytes32 poolId) external view returns (address, PoolSpecialization);\n\n /**\n * @dev Registers `tokens` for the `poolId` Pool. Must be called by the Pool's contract.\n *\n * Pools can only interact with tokens they have registered. Users join a Pool by transferring registered tokens,\n * exit by receiving registered tokens, and can only swap registered tokens.\n *\n * Each token can only be registered once. For Pools with the Two Token specialization, `tokens` must have a length\n * of two, that is, both tokens must be registered in the same `registerTokens` call, and they must be sorted in\n * ascending order.\n *\n * The `tokens` and `assetManagers` arrays must have the same length, and each entry in these indicates the Asset\n * Manager for the corresponding token. Asset Managers can manage a Pool's tokens via `managePoolBalance`,\n * depositing and withdrawing them directly, and can even set their balance to arbitrary amounts. They are therefore\n * expected to be highly secured smart contracts with sound design principles, and the decision to register an\n * Asset Manager should not be made lightly.\n *\n * Pools can choose not to assign an Asset Manager to a given token by passing in the zero address. Once an Asset\n * Manager is set, it cannot be changed except by deregistering the associated token and registering again with a\n * different Asset Manager.\n *\n * Emits a `TokensRegistered` event.\n */\n function registerTokens(\n bytes32 poolId,\n IERC20[] memory tokens,\n address[] memory assetManagers\n ) external;\n\n /**\n * @dev Emitted when a Pool registers tokens by calling `registerTokens`.\n */\n event TokensRegistered(bytes32 indexed poolId, IERC20[] tokens, address[] assetManagers);\n\n /**\n * @dev Deregisters `tokens` for the `poolId` Pool. Must be called by the Pool's contract.\n *\n * Only registered tokens (via `registerTokens`) can be deregistered. Additionally, they must have zero total\n * balance. For Pools with the Two Token specialization, `tokens` must have a length of two, that is, both tokens\n * must be deregistered in the same `deregisterTokens` call.\n *\n * A deregistered token can be re-registered later on, possibly with a different Asset Manager.\n *\n * Emits a `TokensDeregistered` event.\n */\n function deregisterTokens(bytes32 poolId, IERC20[] memory tokens) external;\n\n /**\n * @dev Emitted when a Pool deregisters tokens by calling `deregisterTokens`.\n */\n event TokensDeregistered(bytes32 indexed poolId, IERC20[] tokens);\n\n /**\n * @dev Returns detailed information for a Pool's registered token.\n *\n * `cash` is the number of tokens the Vault currently holds for the Pool. `managed` is the number of tokens\n * withdrawn and held outside the Vault by the Pool's token Asset Manager. The Pool's total balance for `token`\n * equals the sum of `cash` and `managed`.\n *\n * Internally, `cash` and `managed` are stored using 112 bits. No action can ever cause a Pool's token `cash`,\n * `managed` or `total` balance to be greater than 2^112 - 1.\n *\n * `lastChangeBlock` is the number of the block in which `token`'s total balance was last modified (via either a\n * join, exit, swap, or Asset Manager update). This value is useful to avoid so-called 'sandwich attacks', for\n * example when developing price oracles. A change of zero (e.g. caused by a swap with amount zero) is considered a\n * change for this purpose, and will update `lastChangeBlock`.\n *\n * `assetManager` is the Pool's token Asset Manager.\n */\n function getPoolTokenInfo(bytes32 poolId, IERC20 token)\n external\n view\n returns (\n uint256 cash,\n uint256 managed,\n uint256 lastChangeBlock,\n address assetManager\n );\n\n /**\n * @dev Returns a Pool's registered tokens, the total balance for each, and the latest block when *any* of\n * the tokens' `balances` changed.\n *\n * The order of the `tokens` array is the same order that will be used in `joinPool`, `exitPool`, as well as in all\n * Pool hooks (where applicable). Calls to `registerTokens` and `deregisterTokens` may change this order.\n *\n * If a Pool only registers tokens once, and these are sorted in ascending order, they will be stored in the same\n * order as passed to `registerTokens`.\n *\n * Total balances include both tokens held by the Vault and those withdrawn by the Pool's Asset Managers. These are\n * the amounts used by joins, exits and swaps. For a detailed breakdown of token balances, use `getPoolTokenInfo`\n * instead.\n */\n function getPoolTokens(bytes32 poolId)\n external\n view\n returns (\n IERC20[] memory tokens,\n uint256[] memory balances,\n uint256 lastChangeBlock\n );\n\n /**\n * @dev Called by users to join a Pool, which transfers tokens from `sender` into the Pool's balance. This will\n * trigger custom Pool behavior, which will typically grant something in return to `recipient` - often tokenized\n * Pool shares.\n *\n * If the caller is not `sender`, it must be an authorized relayer for them.\n *\n * The `assets` and `maxAmountsIn` arrays must have the same length, and each entry indicates the maximum amount\n * to send for each asset. The amounts to send are decided by the Pool and not the Vault: it just enforces\n * these maximums.\n *\n * If joining a Pool that holds WETH, it is possible to send ETH directly: the Vault will do the wrapping. To enable\n * this mechanism, the IAsset sentinel value (the zero address) must be passed in the `assets` array instead of the\n * WETH address. Note that it is not possible to combine ETH and WETH in the same join. Any excess ETH will be sent\n * back to the caller (not the sender, which is important for relayers).\n *\n * `assets` must have the same length and order as the array returned by `getPoolTokens`. This prevents issues when\n * interacting with Pools that register and deregister tokens frequently. If sending ETH however, the array must be\n * sorted *before* replacing the WETH address with the ETH sentinel value (the zero address), which means the final\n * `assets` array might not be sorted. Pools with no registered tokens cannot be joined.\n *\n * If `fromInternalBalance` is true, the caller's Internal Balance will be preferred: ERC20 transfers will only\n * be made for the difference between the requested amount and Internal Balance (if any). Note that ETH cannot be\n * withdrawn from Internal Balance: attempting to do so will trigger a revert.\n *\n * This causes the Vault to call the `IBasePool.onJoinPool` hook on the Pool's contract, where Pools implement\n * their own custom logic. This typically requires additional information from the user (such as the expected number\n * of Pool shares). This can be encoded in the `userData` argument, which is ignored by the Vault and passed\n * directly to the Pool's contract, as is `recipient`.\n *\n * Emits a `PoolBalanceChanged` event.\n */\n function joinPool(\n bytes32 poolId,\n address sender,\n address recipient,\n JoinPoolRequest memory request\n ) external payable;\n\n struct JoinPoolRequest {\n IAsset[] assets;\n uint256[] maxAmountsIn;\n bytes userData;\n bool fromInternalBalance;\n }\n\n /**\n * @dev Called by users to exit a Pool, which transfers tokens from the Pool's balance to `recipient`. This will\n * trigger custom Pool behavior, which will typically ask for something in return from `sender` - often tokenized\n * Pool shares. The amount of tokens that can be withdrawn is limited by the Pool's `cash` balance (see\n * `getPoolTokenInfo`).\n *\n * If the caller is not `sender`, it must be an authorized relayer for them.\n *\n * The `tokens` and `minAmountsOut` arrays must have the same length, and each entry in these indicates the minimum\n * token amount to receive for each token contract. The amounts to send are decided by the Pool and not the Vault:\n * it just enforces these minimums.\n *\n * If exiting a Pool that holds WETH, it is possible to receive ETH directly: the Vault will do the unwrapping. To\n * enable this mechanism, the IAsset sentinel value (the zero address) must be passed in the `assets` array instead\n * of the WETH address. Note that it is not possible to combine ETH and WETH in the same exit.\n *\n * `assets` must have the same length and order as the array returned by `getPoolTokens`. This prevents issues when\n * interacting with Pools that register and deregister tokens frequently. If receiving ETH however, the array must\n * be sorted *before* replacing the WETH address with the ETH sentinel value (the zero address), which means the\n * final `assets` array might not be sorted. Pools with no registered tokens cannot be exited.\n *\n * If `toInternalBalance` is true, the tokens will be deposited to `recipient`'s Internal Balance. Otherwise,\n * an ERC20 transfer will be performed. Note that ETH cannot be deposited to Internal Balance: attempting to\n * do so will trigger a revert.\n *\n * `minAmountsOut` is the minimum amount of tokens the user expects to get out of the Pool, for each token in the\n * `tokens` array. This array must match the Pool's registered tokens.\n *\n * This causes the Vault to call the `IBasePool.onExitPool` hook on the Pool's contract, where Pools implement\n * their own custom logic. This typically requires additional information from the user (such as the expected number\n * of Pool shares to return). This can be encoded in the `userData` argument, which is ignored by the Vault and\n * passed directly to the Pool's contract.\n *\n * Emits a `PoolBalanceChanged` event.\n */\n function exitPool(\n bytes32 poolId,\n address sender,\n address payable recipient,\n ExitPoolRequest memory request\n ) external;\n\n struct ExitPoolRequest {\n IAsset[] assets;\n uint256[] minAmountsOut;\n bytes userData;\n bool toInternalBalance;\n }\n\n /**\n * @dev Emitted when a user joins or exits a Pool by calling `joinPool` or `exitPool`, respectively.\n */\n event PoolBalanceChanged(\n bytes32 indexed poolId,\n address indexed liquidityProvider,\n IERC20[] tokens,\n int256[] deltas,\n uint256[] protocolFeeAmounts\n );\n\n enum PoolBalanceChangeKind { JOIN, EXIT }\n\n // Swaps\n //\n // Users can swap tokens with Pools by calling the `swap` and `batchSwap` functions. To do this,\n // they need not trust Pool contracts in any way: all security checks are made by the Vault. They must however be\n // aware of the Pools' pricing algorithms in order to estimate the prices Pools will quote.\n //\n // The `swap` function executes a single swap, while `batchSwap` can perform multiple swaps in sequence.\n // In each individual swap, tokens of one kind are sent from the sender to the Pool (this is the 'token in'),\n // and tokens of another kind are sent from the Pool to the recipient in exchange (this is the 'token out').\n // More complex swaps, such as one token in to multiple tokens out can be achieved by batching together\n // individual swaps.\n //\n // There are two swap kinds:\n // - 'given in' swaps, where the amount of tokens in (sent to the Pool) is known, and the Pool determines (via the\n // `onSwap` hook) the amount of tokens out (to send to the recipient).\n // - 'given out' swaps, where the amount of tokens out (received from the Pool) is known, and the Pool determines\n // (via the `onSwap` hook) the amount of tokens in (to receive from the sender).\n //\n // Additionally, it is possible to chain swaps using a placeholder input amount, which the Vault replaces with\n // the calculated output of the previous swap. If the previous swap was 'given in', this will be the calculated\n // tokenOut amount. If the previous swap was 'given out', it will use the calculated tokenIn amount. These extended\n // swaps are known as 'multihop' swaps, since they 'hop' through a number of intermediate tokens before arriving at\n // the final intended token.\n //\n // In all cases, tokens are only transferred in and out of the Vault (or withdrawn from and deposited into Internal\n // Balance) after all individual swaps have been completed, and the net token balance change computed. This makes\n // certain swap patterns, such as multihops, or swaps that interact with the same token pair in multiple Pools, cost\n // much less gas than they would otherwise.\n //\n // It also means that under certain conditions it is possible to perform arbitrage by swapping with multiple\n // Pools in a way that results in net token movement out of the Vault (profit), with no tokens being sent in (only\n // updating the Pool's internal accounting).\n //\n // To protect users from front-running or the market changing rapidly, they supply a list of 'limits' for each token\n // involved in the swap, where either the maximum number of tokens to send (by passing a positive value) or the\n // minimum amount of tokens to receive (by passing a negative value) is specified.\n //\n // Additionally, a 'deadline' timestamp can also be provided, forcing the swap to fail if it occurs after\n // this point in time (e.g. if the transaction failed to be included in a block promptly).\n //\n // If interacting with Pools that hold WETH, it is possible to both send and receive ETH directly: the Vault will do\n // the wrapping and unwrapping. To enable this mechanism, the IAsset sentinel value (the zero address) must be\n // passed in the `assets` array instead of the WETH address. Note that it is possible to combine ETH and WETH in the\n // same swap. Any excess ETH will be sent back to the caller (not the sender, which is relevant for relayers).\n //\n // Finally, Internal Balance can be used when either sending or receiving tokens.\n\n enum SwapKind { GIVEN_IN, GIVEN_OUT }\n\n /**\n * @dev Performs a swap with a single Pool.\n *\n * If the swap is 'given in' (the number of tokens to send to the Pool is known), it returns the amount of tokens\n * taken from the Pool, which must be greater than or equal to `limit`.\n *\n * If the swap is 'given out' (the number of tokens to take from the Pool is known), it returns the amount of tokens\n * sent to the Pool, which must be less than or equal to `limit`.\n *\n * Internal Balance usage and the recipient are determined by the `funds` struct.\n *\n * Emits a `Swap` event.\n */\n function swap(\n SingleSwap memory singleSwap,\n FundManagement memory funds,\n uint256 limit,\n uint256 deadline\n ) external payable returns (uint256);\n\n /**\n * @dev Data for a single swap executed by `swap`. `amount` is either `amountIn` or `amountOut` depending on\n * the `kind` value.\n *\n * `assetIn` and `assetOut` are either token addresses, or the IAsset sentinel value for ETH (the zero address).\n * Note that Pools never interact with ETH directly: it will be wrapped to or unwrapped from WETH by the Vault.\n *\n * The `userData` field is ignored by the Vault, but forwarded to the Pool in the `onSwap` hook, and may be\n * used to extend swap behavior.\n */\n struct SingleSwap {\n bytes32 poolId;\n SwapKind kind;\n IAsset assetIn;\n IAsset assetOut;\n uint256 amount;\n bytes userData;\n }\n\n /**\n * @dev Performs a series of swaps with one or multiple Pools. In each individual swap, the caller determines either\n * the amount of tokens sent to or received from the Pool, depending on the `kind` value.\n *\n * Returns an array with the net Vault asset balance deltas. Positive amounts represent tokens (or ETH) sent to the\n * Vault, and negative amounts represent tokens (or ETH) sent by the Vault. Each delta corresponds to the asset at\n * the same index in the `assets` array.\n *\n * Swaps are executed sequentially, in the order specified by the `swaps` array. Each array element describes a\n * Pool, the token to be sent to this Pool, the token to receive from it, and an amount that is either `amountIn` or\n * `amountOut` depending on the swap kind.\n *\n * Multihop swaps can be executed by passing an `amount` value of zero for a swap. This will cause the amount in/out\n * of the previous swap to be used as the amount in for the current one. In a 'given in' swap, 'tokenIn' must equal\n * the previous swap's `tokenOut`. For a 'given out' swap, `tokenOut` must equal the previous swap's `tokenIn`.\n *\n * The `assets` array contains the addresses of all assets involved in the swaps. These are either token addresses,\n * or the IAsset sentinel value for ETH (the zero address). Each entry in the `swaps` array specifies tokens in and\n * out by referencing an index in `assets`. Note that Pools never interact with ETH directly: it will be wrapped to\n * or unwrapped from WETH by the Vault.\n *\n * Internal Balance usage, sender, and recipient are determined by the `funds` struct. The `limits` array specifies\n * the minimum or maximum amount of each token the vault is allowed to transfer.\n *\n * `batchSwap` can be used to make a single swap, like `swap` does, but doing so requires more gas than the\n * equivalent `swap` call.\n *\n * Emits `Swap` events.\n */\n function batchSwap(\n SwapKind kind,\n BatchSwapStep[] memory swaps,\n IAsset[] memory assets,\n FundManagement memory funds,\n int256[] memory limits,\n uint256 deadline\n ) external payable returns (int256[] memory);\n\n /**\n * @dev Data for each individual swap executed by `batchSwap`. The asset in and out fields are indexes into the\n * `assets` array passed to that function, and ETH assets are converted to WETH.\n *\n * If `amount` is zero, the multihop mechanism is used to determine the actual amount based on the amount in/out\n * from the previous swap, depending on the swap kind.\n *\n * The `userData` field is ignored by the Vault, but forwarded to the Pool in the `onSwap` hook, and may be\n * used to extend swap behavior.\n */\n struct BatchSwapStep {\n bytes32 poolId;\n uint256 assetInIndex;\n uint256 assetOutIndex;\n uint256 amount;\n bytes userData;\n }\n\n /**\n * @dev Emitted for each individual swap performed by `swap` or `batchSwap`.\n */\n event Swap(\n bytes32 indexed poolId,\n IERC20 indexed tokenIn,\n IERC20 indexed tokenOut,\n uint256 amountIn,\n uint256 amountOut\n );\n\n /**\n * @dev All tokens in a swap are either sent from the `sender` account to the Vault, or from the Vault to the\n * `recipient` account.\n *\n * If the caller is not `sender`, it must be an authorized relayer for them.\n *\n * If `fromInternalBalance` is true, the `sender`'s Internal Balance will be preferred, performing an ERC20\n * transfer for the difference between the requested amount and the User's Internal Balance (if any). The `sender`\n * must have allowed the Vault to use their tokens via `IERC20.approve()`. This matches the behavior of\n * `joinPool`.\n *\n * If `toInternalBalance` is true, tokens will be deposited to `recipient`'s internal balance instead of\n * transferred. This matches the behavior of `exitPool`.\n *\n * Note that ETH cannot be deposited to or withdrawn from Internal Balance: attempting to do so will trigger a\n * revert.\n */\n struct FundManagement {\n address sender;\n bool fromInternalBalance;\n address payable recipient;\n bool toInternalBalance;\n }\n\n /**\n * @dev Simulates a call to `batchSwap`, returning an array of Vault asset deltas. Calls to `swap` cannot be\n * simulated directly, but an equivalent `batchSwap` call can and will yield the exact same result.\n *\n * Each element in the array corresponds to the asset at the same index, and indicates the number of tokens (or ETH)\n * the Vault would take from the sender (if positive) or send to the recipient (if negative). The arguments it\n * receives are the same that an equivalent `batchSwap` call would receive.\n *\n * Unlike `batchSwap`, this function performs no checks on the sender or recipient field in the `funds` struct.\n * This makes it suitable to be called by off-chain applications via eth_call without needing to hold tokens,\n * approve them for the Vault, or even know a user's address.\n *\n * Note that this function is not 'view' (due to implementation details): the client code must explicitly execute\n * eth_call instead of eth_sendTransaction.\n */\n function queryBatchSwap(\n SwapKind kind,\n BatchSwapStep[] memory swaps,\n IAsset[] memory assets,\n FundManagement memory funds\n ) external returns (int256[] memory assetDeltas);\n\n // Flash Loans\n\n /**\n * @dev Performs a 'flash loan', sending tokens to `recipient`, executing the `receiveFlashLoan` hook on it,\n * and then reverting unless the tokens plus a proportional protocol fee have been returned.\n *\n * The `tokens` and `amounts` arrays must have the same length, and each entry in these indicates the loan amount\n * for each token contract. `tokens` must be sorted in ascending order.\n *\n * The 'userData' field is ignored by the Vault, and forwarded as-is to `recipient` as part of the\n * `receiveFlashLoan` call.\n *\n * Emits `FlashLoan` events.\n */\n function flashLoan(\n IFlashLoanRecipient recipient,\n IERC20[] memory tokens,\n uint256[] memory amounts,\n bytes memory userData\n ) external;\n\n /**\n * @dev Emitted for each individual flash loan performed by `flashLoan`.\n */\n event FlashLoan(IFlashLoanRecipient indexed recipient, IERC20 indexed token, uint256 amount, uint256 feeAmount);\n\n // Asset Management\n //\n // Each token registered for a Pool can be assigned an Asset Manager, which is able to freely withdraw the Pool's\n // tokens from the Vault, deposit them, or assign arbitrary values to its `managed` balance (see\n // `getPoolTokenInfo`). This makes them extremely powerful and dangerous. Even if an Asset Manager only directly\n // controls one of the tokens in a Pool, a malicious manager could set that token's balance to manipulate the\n // prices of the other tokens, and then drain the Pool with swaps. The risk of using Asset Managers is therefore\n // not constrained to the tokens they are managing, but extends to the entire Pool's holdings.\n //\n // However, a properly designed Asset Manager smart contract can be safely used for the Pool's benefit,\n // for example by lending unused tokens out for interest, or using them to participate in voting protocols.\n //\n // This concept is unrelated to the IAsset interface.\n\n /**\n * @dev Performs a set of Pool balance operations, which may be either withdrawals, deposits or updates.\n *\n * Pool Balance management features batching, which means a single contract call can be used to perform multiple\n * operations of different kinds, with different Pools and tokens, at once.\n *\n * For each operation, the caller must be registered as the Asset Manager for `token` in `poolId`.\n */\n function managePoolBalance(PoolBalanceOp[] memory ops) external;\n\n struct PoolBalanceOp {\n PoolBalanceOpKind kind;\n bytes32 poolId;\n IERC20 token;\n uint256 amount;\n }\n\n /**\n * Withdrawals decrease the Pool's cash, but increase its managed balance, leaving the total balance unchanged.\n *\n * Deposits increase the Pool's cash, but decrease its managed balance, leaving the total balance unchanged.\n *\n * Updates don't affect the Pool's cash balance, but because the managed balance changes, it does alter the total.\n * The external amount can be either increased or decreased by this call (i.e., reporting a gain or a loss).\n */\n enum PoolBalanceOpKind { WITHDRAW, DEPOSIT, UPDATE }\n\n /**\n * @dev Emitted when a Pool's token Asset Manager alters its balance via `managePoolBalance`.\n */\n event PoolBalanceManaged(\n bytes32 indexed poolId,\n address indexed assetManager,\n IERC20 indexed token,\n int256 cashDelta,\n int256 managedDelta\n );\n\n // Protocol Fees\n //\n // Some operations cause the Vault to collect tokens in the form of protocol fees, which can then be withdrawn by\n // permissioned accounts.\n //\n // There are two kinds of protocol fees:\n //\n // - flash loan fees: charged on all flash loans, as a percentage of the amounts lent.\n //\n // - swap fees: a percentage of the fees charged by Pools when performing swaps. For a number of reasons, including\n // swap gas costs and interface simplicity, protocol swap fees are not charged on each individual swap. Rather,\n // Pools are expected to keep track of how much they have charged in swap fees, and pay any outstanding debts to the\n // Vault when they are joined or exited. This prevents users from joining a Pool with unpaid debt, as well as\n // exiting a Pool in debt without first paying their share.\n\n /**\n * @dev Returns the current protocol fee module.\n */\n function getProtocolFeesCollector() external view returns (IProtocolFeesCollector);\n\n /**\n * @dev Safety mechanism to pause most Vault operations in the event of an emergency - typically detection of an\n * error in some part of the system.\n *\n * The Vault can only be paused during an initial time period, after which pausing is forever disabled.\n *\n * While the contract is paused, the following features are disabled:\n * - depositing and transferring internal balance\n * - transferring external balance (using the Vault's allowance)\n * - swaps\n * - joining Pools\n * - Asset Manager interactions\n *\n * Internal Balance can still be withdrawn, and Pools exited.\n */\n function setPaused(bool paused) external;\n\n /**\n * @dev Returns the Vault's WETH instance.\n */\n function WETH() external view returns (IWETH);\n // solhint-disable-previous-line func-name-mixedcase\n}\n"
},
"@balancer-labs/v2-interfaces/contracts/vault/IPoolSwapStructs.sol": {
"content": "// SPDX-License-Identifier: GPL-3.0-or-later\n// This program is free software: you can redistribute it and/or modify\n// it under the terms of the GNU General Public License as published by\n// the Free Software Foundation, either version 3 of the License, or\n// (at your option) any later version.\n\n// This program is distributed in the hope that it will be useful,\n// but WITHOUT ANY WARRANTY; without even the implied warranty of\n// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the\n// GNU General Public License for more details.\n\n// You should have received a copy of the GNU General Public License\n// along with this program. If not, see <http://www.gnu.org/licenses/>.\n\npragma solidity ^0.7.0;\npragma experimental ABIEncoderV2;\n\nimport \"../solidity-utils/openzeppelin/IERC20.sol\";\n\nimport \"./IVault.sol\";\n\ninterface IPoolSwapStructs {\n // This is not really an interface - it just defines common structs used by other interfaces: IGeneralPool and\n // IMinimalSwapInfoPool.\n //\n // This data structure represents a request for a token swap, where `kind` indicates the swap type ('given in' or\n // 'given out') which indicates whether or not the amount sent by the pool is known.\n //\n // The pool receives `tokenIn` and sends `tokenOut`. `amount` is the number of `tokenIn` tokens the pool will take\n // in, or the number of `tokenOut` tokens the Pool will send out, depending on the given swap `kind`.\n //\n // All other fields are not strictly necessary for most swaps, but are provided to support advanced scenarios in\n // some Pools.\n //\n // `poolId` is the ID of the Pool involved in the swap - this is useful for Pool contracts that implement more than\n // one Pool.\n //\n // The meaning of `lastChangeBlock` depends on the Pool specialization:\n // - Two Token or Minimal Swap Info: the last block in which either `tokenIn` or `tokenOut` changed its total\n // balance.\n // - General: the last block in which *any* of the Pool's registered tokens changed its total balance.\n //\n // `from` is the origin address for the funds the Pool receives, and `to` is the destination address\n // where the Pool sends the outgoing tokens.\n //\n // `userData` is extra data provided by the caller - typically a signature from a trusted party.\n struct SwapRequest {\n IVault.SwapKind kind;\n IERC20 tokenIn;\n IERC20 tokenOut;\n uint256 amount;\n // Misc data\n bytes32 poolId;\n uint256 lastChangeBlock;\n address from;\n address to;\n bytes userData;\n }\n}\n"
},
"@balancer-labs/v2-interfaces/contracts/solidity-utils/helpers/IAuthentication.sol": {
"content": "// SPDX-License-Identifier: GPL-3.0-or-later\n// This program is free software: you can redistribute it and/or modify\n// it under the terms of the GNU General Public License as published by\n// the Free Software Foundation, either version 3 of the License, or\n// (at your option) any later version.\n\n// This program is distributed in the hope that it will be useful,\n// but WITHOUT ANY WARRANTY; without even the implied warranty of\n// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the\n// GNU General Public License for more details.\n\n// You should have received a copy of the GNU General Public License\n// along with this program. If not, see <http://www.gnu.org/licenses/>.\n\npragma solidity ^0.7.0;\n\ninterface IAuthentication {\n /**\n * @dev Returns the action identifier associated with the external function described by `selector`.\n */\n function getActionId(bytes4 selector) external view returns (bytes32);\n}\n"
},
"@balancer-labs/v2-interfaces/contracts/solidity-utils/helpers/ISignaturesValidator.sol": {
"content": "// SPDX-License-Identifier: GPL-3.0-or-later\n// This program is free software: you can redistribute it and/or modify\n// it under the terms of the GNU General Public License as published by\n// the Free Software Foundation, either version 3 of the License, or\n// (at your option) any later version.\n\n// This program is distributed in the hope that it will be useful,\n// but WITHOUT ANY WARRANTY; without even the implied warranty of\n// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the\n// GNU General Public License for more details.\n\n// You should have received a copy of the GNU General Public License\n// along with this program. If not, see <http://www.gnu.org/licenses/>.\n\npragma solidity ^0.7.0;\n\n/**\n * @dev Interface for the SignatureValidator helper, used to support meta-transactions.\n */\ninterface ISignaturesValidator {\n /**\n * @dev Returns the EIP712 domain separator.\n */\n function getDomainSeparator() external view returns (bytes32);\n\n /**\n * @dev Returns the next nonce used by an address to sign messages.\n */\n function getNextNonce(address user) external view returns (uint256);\n}\n"
},
"@balancer-labs/v2-interfaces/contracts/solidity-utils/helpers/ITemporarilyPausable.sol": {
"content": "// SPDX-License-Identifier: GPL-3.0-or-later\n// This program is free software: you can redistribute it and/or modify\n// it under the terms of the GNU General Public License as published by\n// the Free Software Foundation, either version 3 of the License, or\n// (at your option) any later version.\n\n// This program is distributed in the hope that it will be useful,\n// but WITHOUT ANY WARRANTY; without even the implied warranty of\n// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the\n// GNU General Public License for more details.\n\n// You should have received a copy of the GNU General Public License\n// along with this program. If not, see <http://www.gnu.org/licenses/>.\n\npragma solidity ^0.7.0;\n\n/**\n * @dev Interface for the TemporarilyPausable helper.\n */\ninterface ITemporarilyPausable {\n /**\n * @dev Emitted every time the pause state changes by `_setPaused`.\n */\n event PausedStateChanged(bool paused);\n\n /**\n * @dev Returns the current paused state.\n */\n function getPausedState()\n external\n view\n returns (\n bool paused,\n uint256 pauseWindowEndTime,\n uint256 bufferPeriodEndTime\n );\n}\n"
},
"@balancer-labs/v2-interfaces/contracts/solidity-utils/misc/IWETH.sol": {
"content": "// SPDX-License-Identifier: GPL-3.0-or-later\n// This program is free software: you can redistribute it and/or modify\n// it under the terms of the GNU General Public License as published by\n// the Free Software Foundation, either version 3 of the License, or\n// (at your option) any later version.\n\n// This program is distributed in the hope that it will be useful,\n// but WITHOUT ANY WARRANTY; without even the implied warranty of\n// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the\n// GNU General Public License for more details.\n\n// You should have received a copy of the GNU General Public License\n// along with this program. If not, see <http://www.gnu.org/licenses/>.\n\npragma solidity ^0.7.0;\n\nimport \"../openzeppelin/IERC20.sol\";\n\n/**\n * @dev Interface for WETH9.\n * See https://github.com/gnosis/canonical-weth/blob/0dd1ea3e295eef916d0c6223ec63141137d22d67/contracts/WETH9.sol\n */\ninterface IWETH is IERC20 {\n function deposit() external payable;\n\n function withdraw(uint256 amount) external;\n}\n"
},
"@balancer-labs/v2-interfaces/contracts/vault/IAsset.sol": {
"content": "// SPDX-License-Identifier: GPL-3.0-or-later\n// This program is free software: you can redistribute it and/or modify\n// it under the terms of the GNU General Public License as published by\n// the Free Software Foundation, either version 3 of the License, or\n// (at your option) any later version.\n\n// This program is distributed in the hope that it will be useful,\n// but WITHOUT ANY WARRANTY; without even the implied warranty of\n// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the\n// GNU General Public License for more details.\n\n// You should have received a copy of the GNU General Public License\n// along with this program. If not, see <http://www.gnu.org/licenses/>.\n\npragma solidity ^0.7.0;\n\n/**\n * @dev This is an empty interface used to represent either ERC20-conforming token contracts or ETH (using the zero\n * address sentinel value). We're just relying on the fact that `interface` can be used to declare new address-like\n * types.\n *\n * This concept is unrelated to a Pool's Asset Managers.\n */\ninterface IAsset {\n // solhint-disable-previous-line no-empty-blocks\n}\n"
},
"@balancer-labs/v2-interfaces/contracts/vault/IAuthorizer.sol": {
"content": "// SPDX-License-Identifier: GPL-3.0-or-later\n// This program is free software: you can redistribute it and/or modify\n// it under the terms of the GNU General Public License as published by\n// the Free Software Foundation, either version 3 of the License, or\n// (at your option) any later version.\n\n// This program is distributed in the hope that it will be useful,\n// but WITHOUT ANY WARRANTY; without even the implied warranty of\n// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the\n// GNU General Public License for more details.\n\n// You should have received a copy of the GNU General Public License\n// along with this program. If not, see <http://www.gnu.org/licenses/>.\n\npragma solidity ^0.7.0;\n\ninterface IAuthorizer {\n /**\n * @dev Returns true if `account` can perform the action described by `actionId` in the contract `where`.\n */\n function canPerform(\n bytes32 actionId,\n address account,\n address where\n ) external view returns (bool);\n}\n"
},
"@balancer-labs/v2-interfaces/contracts/vault/IFlashLoanRecipient.sol": {
"content": "// SPDX-License-Identifier: GPL-3.0-or-later\n// This program is free software: you can redistribute it and/or modify\n// it under the terms of the GNU General Public License as published by\n// the Free Software Foundation, either version 3 of the License, or\n// (at your option) any later version.\n\n// This program is distributed in the hope that it will be useful,\n// but WITHOUT ANY WARRANTY; without even the implied warranty of\n// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the\n// GNU General Public License for more details.\n\n// You should have received a copy of the GNU General Public License\n// along with this program. If not, see <http://www.gnu.org/licenses/>.\n\npragma solidity ^0.7.0;\n\n// Inspired by Aave Protocol's IFlashLoanReceiver.\n\nimport \"../solidity-utils/openzeppelin/IERC20.sol\";\n\ninterface IFlashLoanRecipient {\n /**\n * @dev When `flashLoan` is called on the Vault, it invokes the `receiveFlashLoan` hook on the recipient.\n *\n * At the time of the call, the Vault will have transferred `amounts` for `tokens` to the recipient. Before this\n * call returns, the recipient must have transferred `amounts` plus `feeAmounts` for each token back to the\n * Vault, or else the entire flash loan will revert.\n *\n * `userData` is the same value passed in the `IVault.flashLoan` call.\n */\n function receiveFlashLoan(\n IERC20[] memory tokens,\n uint256[] memory amounts,\n uint256[] memory feeAmounts,\n bytes memory userData\n ) external;\n}\n"
},
"@balancer-labs/v2-interfaces/contracts/vault/IProtocolFeesCollector.sol": {
"content": "// SPDX-License-Identifier: GPL-3.0-or-later\n// This program is free software: you can redistribute it and/or modify\n// it under the terms of the GNU General Public License as published by\n// the Free Software Foundation, either version 3 of the License, or\n// (at your option) any later version.\n\n// This program is distributed in the hope that it will be useful,\n// but WITHOUT ANY WARRANTY; without even the implied warranty of\n// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the\n// GNU General Public License for more details.\n\n// You should have received a copy of the GNU General Public License\n// along with this program. If not, see <http://www.gnu.org/licenses/>.\n\npragma solidity ^0.7.0;\npragma experimental ABIEncoderV2;\n\nimport \"../solidity-utils/openzeppelin/IERC20.sol\";\n\nimport \"./IVault.sol\";\nimport \"./IAuthorizer.sol\";\n\ninterface IProtocolFeesCollector {\n event SwapFeePercentageChanged(uint256 newSwapFeePercentage);\n event FlashLoanFeePercentageChanged(uint256 newFlashLoanFeePercentage);\n\n function withdrawCollectedFees(\n IERC20[] calldata tokens,\n uint256[] calldata amounts,\n address recipient\n ) external;\n\n function setSwapFeePercentage(uint256 newSwapFeePercentage) external;\n\n function setFlashLoanFeePercentage(uint256 newFlashLoanFeePercentage) external;\n\n function getSwapFeePercentage() external view returns (uint256);\n\n function getFlashLoanFeePercentage() external view returns (uint256);\n\n function getCollectedFeeAmounts(IERC20[] memory tokens) external view returns (uint256[] memory feeAmounts);\n\n function getAuthorizer() external view returns (IAuthorizer);\n\n function vault() external view returns (IVault);\n}\n"
},
"@balancer-labs/v2-solidity-utils/contracts/math/LogExpMath.sol": {
"content": "// SPDX-License-Identifier: MIT\n// Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated\n// documentation files (the “Software”), to deal in the Software without restriction, including without limitation the\n// rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to\n// permit persons to whom the Software is furnished to do so, subject to the following conditions:\n\n// The above copyright notice and this permission notice shall be included in all copies or substantial portions of the\n// Software.\n\n// THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE\n// WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR\n// COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR\n// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.\n\npragma solidity ^0.7.0;\n\nimport \"@balancer-labs/v2-interfaces/contracts/solidity-utils/helpers/BalancerErrors.sol\";\n\n/* solhint-disable */\n\n/**\n * @dev Exponentiation and logarithm functions for 18 decimal fixed point numbers (both base and exponent/argument).\n *\n * Exponentiation and logarithm with arbitrary bases (x^y and log_x(y)) are implemented by conversion to natural\n * exponentiation and logarithm (where the base is Euler's number).\n *\n * @author Fernando Martinelli - @fernandomartinelli\n * @author Sergio Yuhjtman - @sergioyuhjtman\n * @author Daniel Fernandez - @dmf7z\n */\nlibrary LogExpMath {\n // All fixed point multiplications and divisions are inlined. This means we need to divide by ONE when multiplying\n // two numbers, and multiply by ONE when dividing them.\n\n // All arguments and return values are 18 decimal fixed point numbers.\n int256 constant ONE_18 = 1e18;\n\n // Internally, intermediate values are computed with higher precision as 20 decimal fixed point numbers, and in the\n // case of ln36, 36 decimals.\n int256 constant ONE_20 = 1e20;\n int256 constant ONE_36 = 1e36;\n\n // The domain of natural exponentiation is bound by the word size and number of decimals used.\n //\n // Because internally the result will be stored using 20 decimals, the largest possible result is\n // (2^255 - 1) / 10^20, which makes the largest exponent ln((2^255 - 1) / 10^20) = 130.700829182905140221.\n // The smallest possible result is 10^(-18), which makes largest negative argument\n // ln(10^(-18)) = -41.446531673892822312.\n // We use 130.0 and -41.0 to have some safety margin.\n int256 constant MAX_NATURAL_EXPONENT = 130e18;\n int256 constant MIN_NATURAL_EXPONENT = -41e18;\n\n // Bounds for ln_36's argument. Both ln(0.9) and ln(1.1) can be represented with 36 decimal places in a fixed point\n // 256 bit integer.\n int256 constant LN_36_LOWER_BOUND = ONE_18 - 1e17;\n int256 constant LN_36_UPPER_BOUND = ONE_18 + 1e17;\n\n uint256 constant MILD_EXPONENT_BOUND = 2**254 / uint256(ONE_20);\n\n // 18 decimal constants\n int256 constant x0 = 128000000000000000000; // 2ˆ7\n int256 constant a0 = 38877084059945950922200000000000000000000000000000000000; // eˆ(x0) (no decimals)\n int256 constant x1 = 64000000000000000000; // 2ˆ6\n int256 constant a1 = 6235149080811616882910000000; // eˆ(x1) (no decimals)\n\n // 20 decimal constants\n int256 constant x2 = 3200000000000000000000; // 2ˆ5\n int256 constant a2 = 7896296018268069516100000000000000; // eˆ(x2)\n int256 constant x3 = 1600000000000000000000; // 2ˆ4\n int256 constant a3 = 888611052050787263676000000; // eˆ(x3)\n int256 constant x4 = 800000000000000000000; // 2ˆ3\n int256 constant a4 = 298095798704172827474000; // eˆ(x4)\n int256 constant x5 = 400000000000000000000; // 2ˆ2\n int256 constant a5 = 5459815003314423907810; // eˆ(x5)\n int256 constant x6 = 200000000000000000000; // 2ˆ1\n int256 constant a6 = 738905609893065022723; // eˆ(x6)\n int256 constant x7 = 100000000000000000000; // 2ˆ0\n int256 constant a7 = 271828182845904523536; // eˆ(x7)\n int256 constant x8 = 50000000000000000000; // 2ˆ-1\n int256 constant a8 = 164872127070012814685; // eˆ(x8)\n int256 constant x9 = 25000000000000000000; // 2ˆ-2\n int256 constant a9 = 128402541668774148407; // eˆ(x9)\n int256 constant x10 = 12500000000000000000; // 2ˆ-3\n int256 constant a10 = 113314845306682631683; // eˆ(x10)\n int256 constant x11 = 6250000000000000000; // 2ˆ-4\n int256 constant a11 = 106449445891785942956; // eˆ(x11)\n\n /**\n * @dev Exponentiation (x^y) with unsigned 18 decimal fixed point base and exponent.\n *\n * Reverts if ln(x) * y is smaller than `MIN_NATURAL_EXPONENT`, or larger than `MAX_NATURAL_EXPONENT`.\n */\n function pow(uint256 x, uint256 y) internal pure returns (uint256) {\n if (y == 0) {\n // We solve the 0^0 indetermination by making it equal one.\n return uint256(ONE_18);\n }\n\n if (x == 0) {\n return 0;\n }\n\n // Instead of computing x^y directly, we instead rely on the properties of logarithms and exponentiation to\n // arrive at that result. In particular, exp(ln(x)) = x, and ln(x^y) = y * ln(x). This means\n // x^y = exp(y * ln(x)).\n\n // The ln function takes a signed value, so we need to make sure x fits in the signed 256 bit range.\n _require(x >> 255 == 0, Errors.X_OUT_OF_BOUNDS);\n int256 x_int256 = int256(x);\n\n // We will compute y * ln(x) in a single step. Depending on the value of x, we can either use ln or ln_36. In\n // both cases, we leave the division by ONE_18 (due to fixed point multiplication) to the end.\n\n // This prevents y * ln(x) from overflowing, and at the same time guarantees y fits in the signed 256 bit range.\n _require(y < MILD_EXPONENT_BOUND, Errors.Y_OUT_OF_BOUNDS);\n int256 y_int256 = int256(y);\n\n int256 logx_times_y;\n if (LN_36_LOWER_BOUND < x_int256 && x_int256 < LN_36_UPPER_BOUND) {\n int256 ln_36_x = _ln_36(x_int256);\n\n // ln_36_x has 36 decimal places, so multiplying by y_int256 isn't as straightforward, since we can't just\n // bring y_int256 to 36 decimal places, as it might overflow. Instead, we perform two 18 decimal\n // multiplications and add the results: one with the first 18 decimals of ln_36_x, and one with the\n // (downscaled) last 18 decimals.\n logx_times_y = ((ln_36_x / ONE_18) * y_int256 + ((ln_36_x % ONE_18) * y_int256) / ONE_18);\n } else {\n logx_times_y = _ln(x_int256) * y_int256;\n }\n logx_times_y /= ONE_18;\n\n // Finally, we compute exp(y * ln(x)) to arrive at x^y\n _require(\n MIN_NATURAL_EXPONENT <= logx_times_y && logx_times_y <= MAX_NATURAL_EXPONENT,\n Errors.PRODUCT_OUT_OF_BOUNDS\n );\n\n return uint256(exp(logx_times_y));\n }\n\n /**\n * @dev Natural exponentiation (e^x) with signed 18 decimal fixed point exponent.\n *\n * Reverts if `x` is smaller than MIN_NATURAL_EXPONENT, or larger than `MAX_NATURAL_EXPONENT`.\n */\n function exp(int256 x) internal pure returns (int256) {\n _require(x >= MIN_NATURAL_EXPONENT && x <= MAX_NATURAL_EXPONENT, Errors.INVALID_EXPONENT);\n\n if (x < 0) {\n // We only handle positive exponents: e^(-x) is computed as 1 / e^x. We can safely make x positive since it\n // fits in the signed 256 bit range (as it is larger than MIN_NATURAL_EXPONENT).\n // Fixed point division requires multiplying by ONE_18.\n return ((ONE_18 * ONE_18) / exp(-x));\n }\n\n // First, we use the fact that e^(x+y) = e^x * e^y to decompose x into a sum of powers of two, which we call x_n,\n // where x_n == 2^(7 - n), and e^x_n = a_n has been precomputed. We choose the first x_n, x0, to equal 2^7\n // because all larger powers are larger than MAX_NATURAL_EXPONENT, and therefore not present in the\n // decomposition.\n // At the end of this process we will have the product of all e^x_n = a_n that apply, and the remainder of this\n // decomposition, which will be lower than the smallest x_n.\n // exp(x) = k_0 * a_0 * k_1 * a_1 * ... + k_n * a_n * exp(remainder), where each k_n equals either 0 or 1.\n // We mutate x by subtracting x_n, making it the remainder of the decomposition.\n\n // The first two a_n (e^(2^7) and e^(2^6)) are too large if stored as 18 decimal numbers, and could cause\n // intermediate overflows. Instead we store them as plain integers, with 0 decimals.\n // Additionally, x0 + x1 is larger than MAX_NATURAL_EXPONENT, which means they will not both be present in the\n // decomposition.\n\n // For each x_n, we test if that term is present in the decomposition (if x is larger than it), and if so deduct\n // it and compute the accumulated product.\n\n int256 firstAN;\n if (x >= x0) {\n x -= x0;\n firstAN = a0;\n } else if (x >= x1) {\n x -= x1;\n firstAN = a1;\n } else {\n firstAN = 1; // One with no decimal places\n }\n\n // We now transform x into a 20 decimal fixed point number, to have enhanced precision when computing the\n // smaller terms.\n x *= 100;\n\n // `product` is the accumulated product of all a_n (except a0 and a1), which starts at 20 decimal fixed point\n // one. Recall that fixed point multiplication requires dividing by ONE_20.\n int256 product = ONE_20;\n\n if (x >= x2) {\n x -= x2;\n product = (product * a2) / ONE_20;\n }\n if (x >= x3) {\n x -= x3;\n product = (product * a3) / ONE_20;\n }\n if (x >= x4) {\n x -= x4;\n product = (product * a4) / ONE_20;\n }\n if (x >= x5) {\n x -= x5;\n product = (product * a5) / ONE_20;\n }\n if (x >= x6) {\n x -= x6;\n product = (product * a6) / ONE_20;\n }\n if (x >= x7) {\n x -= x7;\n product = (product * a7) / ONE_20;\n }\n if (x >= x8) {\n x -= x8;\n product = (product * a8) / ONE_20;\n }\n if (x >= x9) {\n x -= x9;\n product = (product * a9) / ONE_20;\n }\n\n // x10 and x11 are unnecessary here since we have high enough precision already.\n\n // Now we need to compute e^x, where x is small (in particular, it is smaller than x9). We use the Taylor series\n // expansion for e^x: 1 + x + (x^2 / 2!) + (x^3 / 3!) + ... + (x^n / n!).\n\n int256 seriesSum = ONE_20; // The initial one in the sum, with 20 decimal places.\n int256 term; // Each term in the sum, where the nth term is (x^n / n!).\n\n // The first term is simply x.\n term = x;\n seriesSum += term;\n\n // Each term (x^n / n!) equals the previous one times x, divided by n. Since x is a fixed point number,\n // multiplying by it requires dividing by ONE_20, but dividing by the non-fixed point n values does not.\n\n term = ((term * x) / ONE_20) / 2;\n seriesSum += term;\n\n term = ((term * x) / ONE_20) / 3;\n seriesSum += term;\n\n term = ((term * x) / ONE_20) / 4;\n seriesSum += term;\n\n term = ((term * x) / ONE_20) / 5;\n seriesSum += term;\n\n term = ((term * x) / ONE_20) / 6;\n seriesSum += term;\n\n term = ((term * x) / ONE_20) / 7;\n seriesSum += term;\n\n term = ((term * x) / ONE_20) / 8;\n seriesSum += term;\n\n term = ((term * x) / ONE_20) / 9;\n seriesSum += term;\n\n term = ((term * x) / ONE_20) / 10;\n seriesSum += term;\n\n term = ((term * x) / ONE_20) / 11;\n seriesSum += term;\n\n term = ((term * x) / ONE_20) / 12;\n seriesSum += term;\n\n // 12 Taylor terms are sufficient for 18 decimal precision.\n\n // We now have the first a_n (with no decimals), and the product of all other a_n present, and the Taylor\n // approximation of the exponentiation of the remainder (both with 20 decimals). All that remains is to multiply\n // all three (one 20 decimal fixed point multiplication, dividing by ONE_20, and one integer multiplication),\n // and then drop two digits to return an 18 decimal value.\n\n return (((product * seriesSum) / ONE_20) * firstAN) / 100;\n }\n\n /**\n * @dev Logarithm (log(arg, base), with signed 18 decimal fixed point base and argument.\n */\n function log(int256 arg, int256 base) internal pure returns (int256) {\n // This performs a simple base change: log(arg, base) = ln(arg) / ln(base).\n\n // Both logBase and logArg are computed as 36 decimal fixed point numbers, either by using ln_36, or by\n // upscaling.\n\n int256 logBase;\n if (LN_36_LOWER_BOUND < base && base < LN_36_UPPER_BOUND) {\n logBase = _ln_36(base);\n } else {\n logBase = _ln(base) * ONE_18;\n }\n\n int256 logArg;\n if (LN_36_LOWER_BOUND < arg && arg < LN_36_UPPER_BOUND) {\n logArg = _ln_36(arg);\n } else {\n logArg = _ln(arg) * ONE_18;\n }\n\n // When dividing, we multiply by ONE_18 to arrive at a result with 18 decimal places\n return (logArg * ONE_18) / logBase;\n }\n\n /**\n * @dev Natural logarithm (ln(a)) with signed 18 decimal fixed point argument.\n */\n function ln(int256 a) internal pure returns (int256) {\n // The real natural logarithm is not defined for negative numbers or zero.\n _require(a > 0, Errors.OUT_OF_BOUNDS);\n if (LN_36_LOWER_BOUND < a && a < LN_36_UPPER_BOUND) {\n return _ln_36(a) / ONE_18;\n } else {\n return _ln(a);\n }\n }\n\n /**\n * @dev Internal natural logarithm (ln(a)) with signed 18 decimal fixed point argument.\n */\n function _ln(int256 a) private pure returns (int256) {\n if (a < ONE_18) {\n // Since ln(a^k) = k * ln(a), we can compute ln(a) as ln(a) = ln((1/a)^(-1)) = - ln((1/a)). If a is less\n // than one, 1/a will be greater than one, and this if statement will not be entered in the recursive call.\n // Fixed point division requires multiplying by ONE_18.\n return (-_ln((ONE_18 * ONE_18) / a));\n }\n\n // First, we use the fact that ln^(a * b) = ln(a) + ln(b) to decompose ln(a) into a sum of powers of two, which\n // we call x_n, where x_n == 2^(7 - n), which are the natural logarithm of precomputed quantities a_n (that is,\n // ln(a_n) = x_n). We choose the first x_n, x0, to equal 2^7 because the exponential of all larger powers cannot\n // be represented as 18 fixed point decimal numbers in 256 bits, and are therefore larger than a.\n // At the end of this process we will have the sum of all x_n = ln(a_n) that apply, and the remainder of this\n // decomposition, which will be lower than the smallest a_n.\n // ln(a) = k_0 * x_0 + k_1 * x_1 + ... + k_n * x_n + ln(remainder), where each k_n equals either 0 or 1.\n // We mutate a by subtracting a_n, making it the remainder of the decomposition.\n\n // For reasons related to how `exp` works, the first two a_n (e^(2^7) and e^(2^6)) are not stored as fixed point\n // numbers with 18 decimals, but instead as plain integers with 0 decimals, so we need to multiply them by\n // ONE_18 to convert them to fixed point.\n // For each a_n, we test if that term is present in the decomposition (if a is larger than it), and if so divide\n // by it and compute the accumulated sum.\n\n int256 sum = 0;\n if (a >= a0 * ONE_18) {\n a /= a0; // Integer, not fixed point division\n sum += x0;\n }\n\n if (a >= a1 * ONE_18) {\n a /= a1; // Integer, not fixed point division\n sum += x1;\n }\n\n // All other a_n and x_n are stored as 20 digit fixed point numbers, so we convert the sum and a to this format.\n sum *= 100;\n a *= 100;\n\n // Because further a_n are 20 digit fixed point numbers, we multiply by ONE_20 when dividing by them.\n\n if (a >= a2) {\n a = (a * ONE_20) / a2;\n sum += x2;\n }\n\n if (a >= a3) {\n a = (a * ONE_20) / a3;\n sum += x3;\n }\n\n if (a >= a4) {\n a = (a * ONE_20) / a4;\n sum += x4;\n }\n\n if (a >= a5) {\n a = (a * ONE_20) / a5;\n sum += x5;\n }\n\n if (a >= a6) {\n a = (a * ONE_20) / a6;\n sum += x6;\n }\n\n if (a >= a7) {\n a = (a * ONE_20) / a7;\n sum += x7;\n }\n\n if (a >= a8) {\n a = (a * ONE_20) / a8;\n sum += x8;\n }\n\n if (a >= a9) {\n a = (a * ONE_20) / a9;\n sum += x9;\n }\n\n if (a >= a10) {\n a = (a * ONE_20) / a10;\n sum += x10;\n }\n\n if (a >= a11) {\n a = (a * ONE_20) / a11;\n sum += x11;\n }\n\n // a is now a small number (smaller than a_11, which roughly equals 1.06). This means we can use a Taylor series\n // that converges rapidly for values of `a` close to one - the same one used in ln_36.\n // Let z = (a - 1) / (a + 1).\n // ln(a) = 2 * (z + z^3 / 3 + z^5 / 5 + z^7 / 7 + ... + z^(2 * n + 1) / (2 * n + 1))\n\n // Recall that 20 digit fixed point division requires multiplying by ONE_20, and multiplication requires\n // division by ONE_20.\n int256 z = ((a - ONE_20) * ONE_20) / (a + ONE_20);\n int256 z_squared = (z * z) / ONE_20;\n\n // num is the numerator of the series: the z^(2 * n + 1) term\n int256 num = z;\n\n // seriesSum holds the accumulated sum of each term in the series, starting with the initial z\n int256 seriesSum = num;\n\n // In each step, the numerator is multiplied by z^2\n num = (num * z_squared) / ONE_20;\n seriesSum += num / 3;\n\n num = (num * z_squared) / ONE_20;\n seriesSum += num / 5;\n\n num = (num * z_squared) / ONE_20;\n seriesSum += num / 7;\n\n num = (num * z_squared) / ONE_20;\n seriesSum += num / 9;\n\n num = (num * z_squared) / ONE_20;\n seriesSum += num / 11;\n\n // 6 Taylor terms are sufficient for 36 decimal precision.\n\n // Finally, we multiply by 2 (non fixed point) to compute ln(remainder)\n seriesSum *= 2;\n\n // We now have the sum of all x_n present, and the Taylor approximation of the logarithm of the remainder (both\n // with 20 decimals). All that remains is to sum these two, and then drop two digits to return a 18 decimal\n // value.\n\n return (sum + seriesSum) / 100;\n }\n\n /**\n * @dev Intrnal high precision (36 decimal places) natural logarithm (ln(x)) with signed 18 decimal fixed point argument,\n * for x close to one.\n *\n * Should only be used if x is between LN_36_LOWER_BOUND and LN_36_UPPER_BOUND.\n */\n function _ln_36(int256 x) private pure returns (int256) {\n // Since ln(1) = 0, a value of x close to one will yield a very small result, which makes using 36 digits\n // worthwhile.\n\n // First, we transform x to a 36 digit fixed point value.\n x *= ONE_18;\n\n // We will use the following Taylor expansion, which converges very rapidly. Let z = (x - 1) / (x + 1).\n // ln(x) = 2 * (z + z^3 / 3 + z^5 / 5 + z^7 / 7 + ... + z^(2 * n + 1) / (2 * n + 1))\n\n // Recall that 36 digit fixed point division requires multiplying by ONE_36, and multiplication requires\n // division by ONE_36.\n int256 z = ((x - ONE_36) * ONE_36) / (x + ONE_36);\n int256 z_squared = (z * z) / ONE_36;\n\n // num is the numerator of the series: the z^(2 * n + 1) term\n int256 num = z;\n\n // seriesSum holds the accumulated sum of each term in the series, starting with the initial z\n int256 seriesSum = num;\n\n // In each step, the numerator is multiplied by z^2\n num = (num * z_squared) / ONE_36;\n seriesSum += num / 3;\n\n num = (num * z_squared) / ONE_36;\n seriesSum += num / 5;\n\n num = (num * z_squared) / ONE_36;\n seriesSum += num / 7;\n\n num = (num * z_squared) / ONE_36;\n seriesSum += num / 9;\n\n num = (num * z_squared) / ONE_36;\n seriesSum += num / 11;\n\n num = (num * z_squared) / ONE_36;\n seriesSum += num / 13;\n\n num = (num * z_squared) / ONE_36;\n seriesSum += num / 15;\n\n // 8 Taylor terms are sufficient for 36 decimal precision.\n\n // All that remains is multiplying by 2 (non fixed point).\n return seriesSum * 2;\n }\n}\n"
},
"@balancer-labs/v2-interfaces/contracts/standalone-utils/IBalancerQueries.sol": {
"content": "// SPDX-License-Identifier: GPL-3.0-or-later\n// This program is free software: you can redistribute it and/or modify\n// it under the terms of the GNU General Public License as published by\n// the Free Software Foundation, either version 3 of the License, or\n// (at your option) any later version.\n\n// This program is distributed in the hope that it will be useful,\n// but WITHOUT ANY WARRANTY; without even the implied warranty of\n// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the\n// GNU General Public License for more details.\n\n// You should have received a copy of the GNU General Public License\n// along with this program. If not, see <http://www.gnu.org/licenses/>.\n\npragma solidity ^0.7.0;\npragma experimental ABIEncoderV2;\n\nimport \"../vault/IVault.sol\";\n\n/**\n * @dev Provides a way to perform queries on swaps, joins and exits, simulating these operations and returning the exact\n * result they would have if called on the Vault given the current state. Note that the results will be affected by\n * other transactions interacting with the Pools involved.\n *\n * All query functions can be called both on-chain and off-chain.\n *\n * If calling them from a contract, note that all query functions are not `view`. Despite this, these functions produce\n * no net state change, and for all intents and purposes can be thought of as if they were indeed `view`. However,\n * calling them via STATICCALL will fail.\n *\n * If calling them from an off-chain client, make sure to use eth_call: most clients default to eth_sendTransaction for\n * non-view functions.\n *\n * In all cases, the `fromInternalBalance` and `toInternalBalance` fields are entirely ignored: we just use the same\n * structs for simplicity.\n */\ninterface IBalancerQueries {\n function querySwap(IVault.SingleSwap memory singleSwap, IVault.FundManagement memory funds)\n external\n returns (uint256);\n\n function queryBatchSwap(\n IVault.SwapKind kind,\n IVault.BatchSwapStep[] memory swaps,\n IAsset[] memory assets,\n IVault.FundManagement memory funds\n ) external returns (int256[] memory assetDeltas);\n\n function queryJoin(\n bytes32 poolId,\n address sender,\n address recipient,\n IVault.JoinPoolRequest memory request\n ) external returns (uint256 bptOut, uint256[] memory amountsIn);\n\n function queryExit(\n bytes32 poolId,\n address sender,\n address recipient,\n IVault.ExitPoolRequest memory request\n ) external returns (uint256 bptIn, uint256[] memory amountsOut);\n}\n"
},
"@balancer-labs/v2-interfaces/contracts/pool-utils/ILastCreatedPoolFactory.sol": {
"content": "// SPDX-License-Identifier: GPL-3.0-or-later\n// This program is free software: you can redistribute it and/or modify\n// it under the terms of the GNU General Public License as published by\n// the Free Software Foundation, either version 3 of the License, or\n// (at your option) any later version.\n\n// This program is distributed in the hope that it will be useful,\n// but WITHOUT ANY WARRANTY; without even the implied warranty of\n// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the\n// GNU General Public License for more details.\n\n// You should have received a copy of the GNU General Public License\n// along with this program. If not, see <http://www.gnu.org/licenses/>.\n\npragma solidity ^0.7.0;\npragma experimental ABIEncoderV2;\n\nimport \"./IBasePoolSplitCodeFactory.sol\";\n\ninterface ILastCreatedPoolFactory is IBasePoolSplitCodeFactory {\n /**\n * @dev Returns the address of the last Pool created by this factory.\n *\n * This is typically only useful in complex Pool deployment schemes, where multiple subsystems need to know about\n * each other. Note that this value will only be updated once construction of the last created Pool finishes.\n */\n function getLastCreatedPool() external view returns (address);\n}\n"
},
"contracts/aave/AaveLinearPoolRebalancer.sol": {
"content": "// SPDX-License-Identifier: GPL-3.0-or-later\n// This program is free software: you can redistribute it and/or modify\n// it under the terms of the GNU General Public License as published by\n// the Free Software Foundation, either version 3 of the License, or\n// (at your option) any later version.\n\n// This program is distributed in the hope that it will be useful,\n// but WITHOUT ANY WARRANTY; without even the implied warranty of\n// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the\n// GNU General Public License for more details.\n\n// You should have received a copy of the GNU General Public License\n// along with this program. If not, see <http://www.gnu.org/licenses/>.\n\npragma solidity ^0.7.0;\npragma experimental ABIEncoderV2;\n\nimport \"@balancer-labs/v2-interfaces/contracts/pool-linear/IStaticAToken.sol\";\nimport \"@balancer-labs/v2-interfaces/contracts/pool-utils/ILastCreatedPoolFactory.sol\";\n\nimport \"../LinearPoolRebalancer.sol\";\n\ncontract AaveLinearPoolRebalancer is LinearPoolRebalancer {\n // These Rebalancers can only be deployed from a factory to work around a circular dependency: the Pool must know\n // the address of the Rebalancer in order to register it, and the Rebalancer must know the address of the Pool\n // during construction.\n constructor(IVault vault, IBalancerQueries queries)\n LinearPoolRebalancer(ILinearPool(ILastCreatedPoolFactory(msg.sender).getLastCreatedPool()), vault, queries)\n {\n // solhint-disable-previous-line no-empty-blocks\n }\n\n function _wrapTokens(uint256 amount) internal override {\n // No referral code, depositing from underlying (i.e. DAI, USDC, etc. instead of aDAI or aUSDC). Before we can\n // deposit however, we need to approve the wrapper in the underlying token.\n _mainToken.approve(address(_wrappedToken), amount);\n IStaticAToken(address(_wrappedToken)).deposit(address(this), amount, 0, true);\n }\n\n function _unwrapTokens(uint256 amount) internal override {\n // Withdrawing into underlying (i.e. DAI, USDC, etc. instead of aDAI or aUSDC). Approvals are not necessary here\n // as the wrapped token is simply burnt.\n IStaticAToken(address(_wrappedToken)).withdraw(address(this), amount, true);\n }\n\n function _getRequiredTokensToWrap(uint256 wrappedAmount) internal view override returns (uint256) {\n // staticToDynamic returns how many main tokens will be returned when unwrapping. Since there's fixed point\n // divisions and multiplications with rounding involved, this value might be off by one. We add one to ensure\n // the returned value will always be enough to get `wrappedAmount` when unwrapping. This might result in some\n // dust being left in the Rebalancer.\n return IStaticAToken(address(_wrappedToken)).staticToDynamicAmount(wrappedAmount) + 1;\n }\n}\n"
},
"@balancer-labs/v2-interfaces/contracts/pool-utils/IBasePoolSplitCodeFactory.sol": {
"content": "// SPDX-License-Identifier: GPL-3.0-or-later\n// This program is free software: you can redistribute it and/or modify\n// it under the terms of the GNU General Public License as published by\n// the Free Software Foundation, either version 3 of the License, or\n// (at your option) any later version.\n\n// This program is distributed in the hope that it will be useful,\n// but WITHOUT ANY WARRANTY; without even the implied warranty of\n// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the\n// GNU General Public License for more details.\n\n// You should have received a copy of the GNU General Public License\n// along with this program. If not, see <http://www.gnu.org/licenses/>.\n\npragma solidity ^0.7.0;\npragma experimental ABIEncoderV2;\n\nimport \"../solidity-utils/helpers/IAuthentication.sol\";\n\ninterface IBasePoolSplitCodeFactory is IAuthentication {\n /**\n * @dev Returns true if `pool` was created by this factory.\n */\n function isPoolFromFactory(address pool) external view returns (bool);\n\n /**\n * @dev Check whether the derived factory has been disabled.\n */\n function isDisabled() external view returns (bool);\n\n /**\n * @dev Disable the factory, preventing the creation of more pools. Already existing pools are unaffected.\n * Once a factory is disabled, it cannot be re-enabled.\n */\n function disable() external;\n}\n"
},
"contracts/LinearPoolRebalancer.sol": {
"content": "// SPDX-License-Identifier: GPL-3.0-or-later\n// This program is free software: you can redistribute it and/or modify\n// it under the terms of the GNU General Public License as published by\n// the Free Software Foundation, either version 3 of the License, or\n// (at your option) any later version.\n\n// This program is distributed in the hope that it will be useful,\n// but WITHOUT ANY WARRANTY; without even the implied warranty of\n// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the\n// GNU General Public License for more details.\n\n// You should have received a copy of the GNU General Public License\n// along with this program. If not, see <http://www.gnu.org/licenses/>.\n\npragma solidity ^0.7.0;\npragma experimental ABIEncoderV2;\n\nimport \"@balancer-labs/v2-interfaces/contracts/solidity-utils/helpers/BalancerErrors.sol\";\n\nimport \"@balancer-labs/v2-interfaces/contracts/vault/IVault.sol\";\nimport \"@balancer-labs/v2-interfaces/contracts/standalone-utils/IBalancerQueries.sol\";\nimport \"@balancer-labs/v2-interfaces/contracts/pool-linear/ILinearPool.sol\";\n\nimport \"@balancer-labs/v2-solidity-utils/contracts/math/FixedPoint.sol\";\nimport \"@balancer-labs/v2-solidity-utils/contracts/openzeppelin/SafeERC20.sol\";\n\nabstract contract LinearPoolRebalancer {\n using SafeERC20 for IERC20;\n\n ILinearPool internal immutable _pool;\n bytes32 internal immutable _poolId;\n\n IERC20 internal immutable _mainToken;\n IERC20 internal immutable _wrappedToken;\n\n uint256 internal immutable _mainTokenScalingFactor;\n\n IVault internal immutable _vault;\n\n IBalancerQueries internal immutable _queries;\n\n constructor(\n ILinearPool pool,\n IVault vault,\n IBalancerQueries queries\n ) {\n _mainTokenScalingFactor = pool.getScalingFactors()[pool.getMainIndex()];\n\n _pool = pool;\n _poolId = pool.getPoolId();\n _mainToken = pool.getMainToken();\n _wrappedToken = pool.getWrappedToken();\n _vault = vault;\n _queries = queries;\n }\n\n function getPool() external view returns (ILinearPool) {\n return _pool;\n }\n\n /**\n * @notice Rebalance a Linear Pool from an asset manager to maintain optimal operating conditions.\n * @dev Use the asset manager mechanism to wrap/unwrap tokens as necessary to keep the main token\n * balance as close as possible to the midpoint between the upper and lower targets: the fee-free zone\n * where trading volume is highest.\n *\n * Note that this function may fail if called while the Pool is in the no-fee zone - use `rebalanceWithExtraMain` to\n * guarantee a successful execution.\n */\n function rebalance(address recipient) external returns (uint256) {\n return _rebalance(recipient);\n }\n\n /**\n * @notice Rebalance a Linear Pool from an asset manager to maintain optimal operating conditions.\n * @dev This function performs the same action as `rebalance`, except this also works in scenarios where the Pool\n * is in the no-fee zone. This is done by first taking `extraMain` tokens from the caller, to cover for rounding\n * errors that are normally offset by acccumulated fees. Any extra tokens unused during the rebalance are sent to\n * the recipient as usual.\n */\n function rebalanceWithExtraMain(address recipient, uint256 extraMain) external returns (uint256) {\n // The Pool rounds rates in its favor, which means that the fees it has collected are actually not quite enough\n // to cover for the cost of wrapping/unwrapping. However, this error is so small that it is typically a\n // non-issue, and simply results in slightly reduced returns for the recipient.\n // However, while the Pool is in the no-fee zone, the lack of fees to cover for this rate discrepancy is a\n // problem. We therefore require a minute amount of extra main token so that we'll be able to account for this\n // rounding error. Values in the order of a few wei are typically sufficient.\n\n _mainToken.safeTransferFrom(msg.sender, address(this), extraMain);\n return _rebalance(recipient);\n }\n\n function _rebalance(address recipient) private returns (uint256) {\n // The first thing we need to test is whether the Pool is below or above the target level, which will\n // determine whether we need to deposit or withdraw main tokens.\n uint256 desiredMainTokenBalance = _getDesiredMainTokenBalance();\n\n // For a 3 token General Pool, it is cheaper to query the balance for a single token than to read all balances,\n // as getPoolTokenInfo will check for token existence, token balance and Asset Manager (3 reads), while\n // getPoolTokens will read the number of tokens, their addresses and balances (7 reads).\n // We can assume that the managed balance is zero (since we're the Pool's Asset Manager and we always set it to\n // zero), and work with the cash directly as if it were the total balance.\n (uint256 mainTokenBalance, , , ) = _vault.getPoolTokenInfo(_poolId, _mainToken);\n\n if (mainTokenBalance < desiredMainTokenBalance) {\n return _rebalanceLackOfMainToken(desiredMainTokenBalance - mainTokenBalance, recipient);\n } else if (mainTokenBalance > desiredMainTokenBalance) {\n return _rebalanceExcessOfMainToken(mainTokenBalance - desiredMainTokenBalance, recipient);\n }\n }\n\n function _rebalanceLackOfMainToken(uint256 missingMainAmount, address recipient) private returns (uint256) {\n // The Pool needs to increase the main token balance, so we prepare a swap where we provide the missing main\n // token amount in exchange for wrapped tokens, that is, the main token is the token in. Since we know this\n // amount, this is a 'given in' swap.\n IVault.SingleSwap memory swap = IVault.SingleSwap({\n poolId: _poolId,\n kind: IVault.SwapKind.GIVEN_IN,\n assetIn: IAsset(address(_mainToken)),\n assetOut: IAsset(address(_wrappedToken)),\n amount: missingMainAmount,\n userData: \"\"\n });\n\n // We can now query how much wrapped token the Pool would return if we were to execute this swap. The Linear\n // Pool invariant guarantees that this amount can be unwrapped to an amount greater than `missingMainAmount`,\n // with the difference originating from swap fees.\n\n IVault.FundManagement memory funds; // This is unused in the query, so we don't bother initializing it.\n uint256 wrappedAmountOut = _queries.querySwap(swap, funds);\n\n // Since we lack the main tokens required to actually execute the swap, we instead use our Asset Manager\n // permission to withdraw wrapped tokens from the Pool, unwrap them, and then deposit them as main tokens.\n // The amounts involved will be the exact same amounts as the one in the swap above, meaning the overall state\n // transition will be the same, except we will never actually call the Linear Pool. However, since the Linear\n // Pool's `onSwap` function is `view`, this is irrelevant.\n\n _withdrawFromPool(_wrappedToken, wrappedAmountOut);\n _unwrapTokens(wrappedAmountOut);\n _depositToPool(_mainToken, missingMainAmount);\n\n // This contract will now hold excess main token, since unwrapping `wrappedAmountOut` should have resulted in\n // more than `missingMainAmount` being obtained. These are sent to the caller to refund the gas cost.\n uint256 reward = _mainToken.balanceOf(address(this));\n _mainToken.safeTransfer(recipient, reward);\n return reward;\n }\n\n function _rebalanceExcessOfMainToken(uint256 excessMainAmount, address recipient) private returns (uint256) {\n // The Pool needs to reduce its main token balance, so we do a swap where we take the excess main token amount\n // and send wrapped tokens in exchange, that is, the main token is the token out. Since we know this amount,\n // this is a 'given out' swap.\n IVault.SingleSwap memory swap = IVault.SingleSwap({\n poolId: _poolId,\n kind: IVault.SwapKind.GIVEN_OUT,\n assetIn: IAsset(address(_wrappedToken)),\n assetOut: IAsset(address(_mainToken)),\n amount: excessMainAmount,\n userData: \"\"\n });\n\n // We can now query how much wrapped token we would need to send to the Pool if we were to execute this swap.\n // The Linear Pool invariant guarantees that this amount is less than what would be obtained by wrapping\n // `excessMainAmount`, with the difference originating from swap fees.\n\n IVault.FundManagement memory funds; // This is unused in the query, so we don't bother initializing it.\n uint256 wrappedAmountIn = _queries.querySwap(swap, funds);\n\n // Since we lack the wrapped tokens required to actually execute the swap, we instead use our Asset Manager\n // permission to withdraw main tokens from the Pool, wrap them, and then deposit them as wrapped tokens. The\n // amounts involved will be the exact same amounts as the those in the swap above, meaning the overall\n // state will be the same, except we will never actually call the Linear Pool. However, since the Linear\n // Pool's `onSwap` function is `view`, this is irrelevant.\n\n _withdrawFromPool(_mainToken, excessMainAmount);\n // We're not going to wrap the full amount, only what is required to get `wrappedAmountIn` back. Any remaining\n // main tokens will be transferred to the sender to refund the gas cost.\n _wrapTokens(_getRequiredTokensToWrap(wrappedAmountIn));\n _depositToPool(_wrappedToken, wrappedAmountIn);\n\n // This contract will now hold excess main token, since we didn't wrap all that was withdrawn. These are sent to\n // the caller to refund the gas cost.\n uint256 reward = _mainToken.balanceOf(address(this));\n _mainToken.safeTransfer(recipient, reward);\n return reward;\n }\n\n function _withdrawFromPool(IERC20 token, uint256 amount) private {\n // Tokens can be withdrawn from the Vault with a 'withdraw' operation, but that will create 'managed' balance\n // and leave the 'total' balance unchanged. We therefore have to perform two operations: one to withdraw, and\n // another to clear the 'managed' balance (as the tokens withdrawn are about to be wrapped or unwrapped, and\n // therefore lost to the Pool in their current format).\n IVault.PoolBalanceOp[] memory withdrawal = new IVault.PoolBalanceOp[](2);\n\n // First, we withdraw the tokens, creating a non-zero 'managed' balance in the Pool.\n withdrawal[0].kind = IVault.PoolBalanceOpKind.WITHDRAW;\n withdrawal[0].poolId = _poolId;\n withdrawal[0].amount = amount;\n withdrawal[0].token = token;\n\n // Then, we clear the 'managed' balance.\n withdrawal[1].kind = IVault.PoolBalanceOpKind.UPDATE;\n withdrawal[1].poolId = _poolId;\n withdrawal[1].amount = 0;\n withdrawal[1].token = token;\n\n _vault.managePoolBalance(withdrawal);\n }\n\n function _depositToPool(IERC20 token, uint256 amount) private {\n // Tokens can be deposited to the Vault with a 'deposit' operation, but that requires a prior 'managed'\n // balance to exist. We therefore have to perform two operations: one to set the 'managed' balance (representing\n // the new tokens that resulted from wrapping or unwrapping and which we are managing for the Pool), and\n // another to deposit.\n IVault.PoolBalanceOp[] memory deposit = new IVault.PoolBalanceOp[](2);\n\n // First, we inform the Vault of the 'managed' tokens.\n deposit[0].kind = IVault.PoolBalanceOpKind.UPDATE;\n deposit[0].poolId = _poolId;\n deposit[0].amount = amount;\n deposit[0].token = token;\n\n // Then, we deposit them, clearing the 'managed' balance.\n deposit[1].kind = IVault.PoolBalanceOpKind.DEPOSIT;\n deposit[1].poolId = _poolId;\n deposit[1].amount = amount;\n deposit[1].token = token;\n\n // Before we can deposit tokens into the Vault however, we must approve them.\n token.approve(address(_vault), amount);\n _vault.managePoolBalance(deposit);\n }\n\n function _getDesiredMainTokenBalance() private view returns (uint256) {\n // The desired main token balance is the midpoint of the lower and upper targets. Keeping the balance\n // close to that value maximizes Pool swap volume by allowing zero-fee swaps in either direction.\n (uint256 lowerTarget, uint256 upperTarget) = _pool.getTargets();\n uint256 midpoint = (lowerTarget + upperTarget) / 2;\n\n // The targets are upscaled by the main token's scaling factor, so we undo that. Note that we're assuming that\n // the main token's scaling factor is constant.\n return FixedPoint.divDown(midpoint, _mainTokenScalingFactor);\n }\n\n /**\n * @dev Wraps `amount` of `_mainToken` into `_wrappedToken`.\n */\n function _wrapTokens(uint256 amount) internal virtual;\n\n /**\n * @dev Unwraps `amount` of `_wrappedToken` into `_mainToken`.\n */\n function _unwrapTokens(uint256 amount) internal virtual;\n\n /**\n * @dev Returns how many main tokens must be wrapped in order to get `wrappedAmount` back.\n */\n function _getRequiredTokensToWrap(uint256 wrappedAmount) internal view virtual returns (uint256);\n}\n"
},
"@balancer-labs/v2-solidity-utils/contracts/openzeppelin/SafeERC20.sol": {
"content": "// SPDX-License-Identifier: MIT\n\n// Based on the ReentrancyGuard library from OpenZeppelin Contracts, altered to reduce gas costs.\n// The `safeTransfer` and `safeTransferFrom` functions assume that `token` is a contract (an account with code), and\n// work differently from the OpenZeppelin version if it is not.\n\npragma solidity ^0.7.0;\n\nimport \"@balancer-labs/v2-interfaces/contracts/solidity-utils/helpers/BalancerErrors.sol\";\nimport \"@balancer-labs/v2-interfaces/contracts/solidity-utils/openzeppelin/IERC20.sol\";\n\n/**\n * @title SafeERC20\n * @dev Wrappers around ERC20 operations that throw on failure (when the token\n * contract returns false). Tokens that return no value (and instead revert or\n * throw on failure) are also supported, non-reverting calls are assumed to be\n * successful.\n * To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract,\n * which allows you to call the safe operations as `token.safeTransfer(...)`, etc.\n */\nlibrary SafeERC20 {\n function safeTransfer(\n IERC20 token,\n address to,\n uint256 value\n ) internal {\n _callOptionalReturn(address(token), abi.encodeWithSelector(token.transfer.selector, to, value));\n }\n\n function safeTransferFrom(\n IERC20 token,\n address from,\n address to,\n uint256 value\n ) internal {\n _callOptionalReturn(address(token), abi.encodeWithSelector(token.transferFrom.selector, from, to, value));\n }\n\n /**\n * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement\n * on the return value: the return value is optional (but if data is returned, it must not be false).\n *\n * WARNING: `token` is assumed to be a contract: calls to EOAs will *not* revert.\n */\n function _callOptionalReturn(address token, bytes memory data) private {\n // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since\n // we're implementing it ourselves.\n // solhint-disable-next-line avoid-low-level-calls\n (bool success, bytes memory returndata) = token.call(data);\n\n // If the low-level call didn't succeed we return whatever was returned from it.\n // solhint-disable-next-line no-inline-assembly\n assembly {\n if eq(success, 0) {\n returndatacopy(0, 0, returndatasize())\n revert(0, returndatasize())\n }\n }\n\n // Finally we check the returndata size is either zero or true - note that this check will always pass for EOAs\n _require(returndata.length == 0 || abi.decode(returndata, (bool)), Errors.SAFE_ERC20_CALL_FAILED);\n }\n}\n"
}
},
"settings": {
"optimizer": {
"enabled": true,
"runs": 9999
},
"outputSelection": {
"*": {
"*": [
"evm.bytecode",
"evm.deployedBytecode",
"devdoc",
"userdoc",
"metadata",
"abi"
]
}
},
"libraries": {}
}
} |