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Contract Name:
BatchRelayerQueryLibrary
Compiler Version
v0.7.1+commit.f4a555be
Optimization Enabled:
Yes with 9999 runs
Other Settings:
default evmVersion
Contract Source Code (Solidity Standard Json-Input format)
// SPDX-License-Identifier: GPL-3.0-or-later
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
pragma solidity ^0.7.0;
pragma experimental ABIEncoderV2;
import "./relayer/BaseRelayerLibraryCommon.sol";
import "./relayer/VaultQueryActions.sol";
/**
* @title Batch Relayer Library
* @notice This contract is not a relayer by itself and calls into it directly will fail.
* The associated relayer can be found by calling `getEntrypoint` on this contract.
*/
contract BatchRelayerQueryLibrary is BaseRelayerLibraryCommon, VaultQueryActions {
constructor(IVault vault) BaseRelayerLibraryCommon(vault) {
//solhint-disable-previous-line no-empty-blocks
}
}// SPDX-License-Identifier: GPL-3.0-or-later
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
pragma solidity >=0.7.0 <0.9.0;
library StablePoolUserData {
enum JoinKind { INIT, EXACT_TOKENS_IN_FOR_BPT_OUT, TOKEN_IN_FOR_EXACT_BPT_OUT, ALL_TOKENS_IN_FOR_EXACT_BPT_OUT }
enum ExitKind { EXACT_BPT_IN_FOR_ONE_TOKEN_OUT, BPT_IN_FOR_EXACT_TOKENS_OUT, EXACT_BPT_IN_FOR_ALL_TOKENS_OUT }
function joinKind(bytes memory self) internal pure returns (JoinKind) {
return abi.decode(self, (JoinKind));
}
function exitKind(bytes memory self) internal pure returns (ExitKind) {
return abi.decode(self, (ExitKind));
}
// Joins
function initialAmountsIn(bytes memory self) internal pure returns (uint256[] memory amountsIn) {
(, amountsIn) = abi.decode(self, (JoinKind, uint256[]));
}
function exactTokensInForBptOut(bytes memory self)
internal
pure
returns (uint256[] memory amountsIn, uint256 minBPTAmountOut)
{
(, amountsIn, minBPTAmountOut) = abi.decode(self, (JoinKind, uint256[], uint256));
}
function tokenInForExactBptOut(bytes memory self) internal pure returns (uint256 bptAmountOut, uint256 tokenIndex) {
(, bptAmountOut, tokenIndex) = abi.decode(self, (JoinKind, uint256, uint256));
}
function allTokensInForExactBptOut(bytes memory self) internal pure returns (uint256 bptAmountOut) {
(, bptAmountOut) = abi.decode(self, (JoinKind, uint256));
}
// Exits
function exactBptInForTokenOut(bytes memory self) internal pure returns (uint256 bptAmountIn, uint256 tokenIndex) {
(, bptAmountIn, tokenIndex) = abi.decode(self, (ExitKind, uint256, uint256));
}
function exactBptInForTokensOut(bytes memory self) internal pure returns (uint256 bptAmountIn) {
(, bptAmountIn) = abi.decode(self, (ExitKind, uint256));
}
function bptInForExactTokensOut(bytes memory self)
internal
pure
returns (uint256[] memory amountsOut, uint256 maxBPTAmountIn)
{
(, amountsOut, maxBPTAmountIn) = abi.decode(self, (ExitKind, uint256[], uint256));
}
}// SPDX-License-Identifier: GPL-3.0-or-later
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
pragma solidity >=0.7.0 <0.9.0;
library BasePoolUserData {
// Special ExitKind for all pools, used in Recovery Mode. Use the max 8-bit value to prevent conflicts
// with future additions to the ExitKind enums (or any front-end code that maps to existing values)
uint8 public constant RECOVERY_MODE_EXIT_KIND = 255;
// Return true if this is the special exit kind.
function isRecoveryModeExitKind(bytes memory self) internal pure returns (bool) {
// Check for the "no data" case, or abi.decode would revert
return self.length > 0 && abi.decode(self, (uint8)) == RECOVERY_MODE_EXIT_KIND;
}
// Parse the bptAmountIn out of the userData
function recoveryModeExit(bytes memory self) internal pure returns (uint256 bptAmountIn) {
(, bptAmountIn) = abi.decode(self, (uint8, uint256));
}
}// SPDX-License-Identifier: GPL-3.0-or-later
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
pragma solidity >=0.7.0 <0.9.0;
import "../solidity-utils/openzeppelin/IERC20.sol";
library WeightedPoolUserData {
// In order to preserve backwards compatibility, make sure new join and exit kinds are added at the end of the enum.
enum JoinKind { INIT, EXACT_TOKENS_IN_FOR_BPT_OUT, TOKEN_IN_FOR_EXACT_BPT_OUT, ALL_TOKENS_IN_FOR_EXACT_BPT_OUT }
enum ExitKind { EXACT_BPT_IN_FOR_ONE_TOKEN_OUT, EXACT_BPT_IN_FOR_TOKENS_OUT, BPT_IN_FOR_EXACT_TOKENS_OUT }
function joinKind(bytes memory self) internal pure returns (JoinKind) {
return abi.decode(self, (JoinKind));
}
function exitKind(bytes memory self) internal pure returns (ExitKind) {
return abi.decode(self, (ExitKind));
}
// Joins
function initialAmountsIn(bytes memory self) internal pure returns (uint256[] memory amountsIn) {
(, amountsIn) = abi.decode(self, (JoinKind, uint256[]));
}
function exactTokensInForBptOut(bytes memory self)
internal
pure
returns (uint256[] memory amountsIn, uint256 minBPTAmountOut)
{
(, amountsIn, minBPTAmountOut) = abi.decode(self, (JoinKind, uint256[], uint256));
}
function tokenInForExactBptOut(bytes memory self) internal pure returns (uint256 bptAmountOut, uint256 tokenIndex) {
(, bptAmountOut, tokenIndex) = abi.decode(self, (JoinKind, uint256, uint256));
}
function allTokensInForExactBptOut(bytes memory self) internal pure returns (uint256 bptAmountOut) {
(, bptAmountOut) = abi.decode(self, (JoinKind, uint256));
}
// Exits
function exactBptInForTokenOut(bytes memory self) internal pure returns (uint256 bptAmountIn, uint256 tokenIndex) {
(, bptAmountIn, tokenIndex) = abi.decode(self, (ExitKind, uint256, uint256));
}
function exactBptInForTokensOut(bytes memory self) internal pure returns (uint256 bptAmountIn) {
(, bptAmountIn) = abi.decode(self, (ExitKind, uint256));
}
function bptInForExactTokensOut(bytes memory self)
internal
pure
returns (uint256[] memory amountsOut, uint256 maxBPTAmountIn)
{
(, amountsOut, maxBPTAmountIn) = abi.decode(self, (ExitKind, uint256[], uint256));
}
}// SPDX-License-Identifier: GPL-3.0-or-later
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
pragma solidity >=0.7.1 <0.9.0;
// solhint-disable
/**
* @dev Reverts if `condition` is false, with a revert reason containing `errorCode`. Only codes up to 999 are
* supported.
* Uses the default 'BAL' prefix for the error code
*/
function _require(bool condition, uint256 errorCode) pure {
if (!condition) _revert(errorCode);
}
/**
* @dev Reverts if `condition` is false, with a revert reason containing `errorCode`. Only codes up to 999 are
* supported.
*/
function _require(
bool condition,
uint256 errorCode,
bytes3 prefix
) pure {
if (!condition) _revert(errorCode, prefix);
}
/**
* @dev Reverts with a revert reason containing `errorCode`. Only codes up to 999 are supported.
* Uses the default 'BAL' prefix for the error code
*/
function _revert(uint256 errorCode) pure {
_revert(errorCode, 0x42414c); // This is the raw byte representation of "BAL"
}
/**
* @dev Reverts with a revert reason containing `errorCode`. Only codes up to 999 are supported.
*/
function _revert(uint256 errorCode, bytes3 prefix) pure {
uint256 prefixUint = uint256(uint24(prefix));
// We're going to dynamically create a revert string based on the error code, with the following format:
// 'BAL#{errorCode}'
// where the code is left-padded with zeroes to three digits (so they range from 000 to 999).
//
// We don't have revert strings embedded in the contract to save bytecode size: it takes much less space to store a
// number (8 to 16 bits) than the individual string characters.
//
// The dynamic string creation algorithm that follows could be implemented in Solidity, but assembly allows for a
// much denser implementation, again saving bytecode size. Given this function unconditionally reverts, this is a
// safe place to rely on it without worrying about how its usage might affect e.g. memory contents.
assembly {
// First, we need to compute the ASCII representation of the error code. We assume that it is in the 0-999
// range, so we only need to convert three digits. To convert the digits to ASCII, we add 0x30, the value for
// the '0' character.
let units := add(mod(errorCode, 10), 0x30)
errorCode := div(errorCode, 10)
let tenths := add(mod(errorCode, 10), 0x30)
errorCode := div(errorCode, 10)
let hundreds := add(mod(errorCode, 10), 0x30)
// With the individual characters, we can now construct the full string.
// We first append the '#' character (0x23) to the prefix. In the case of 'BAL', it results in 0x42414c23 ('BAL#')
// Then, we shift this by 24 (to provide space for the 3 bytes of the error code), and add the
// characters to it, each shifted by a multiple of 8.
// The revert reason is then shifted left by 200 bits (256 minus the length of the string, 7 characters * 8 bits
// per character = 56) to locate it in the most significant part of the 256 slot (the beginning of a byte
// array).
let formattedPrefix := shl(24, add(0x23, shl(8, prefixUint)))
let revertReason := shl(200, add(formattedPrefix, add(add(units, shl(8, tenths)), shl(16, hundreds))))
// We can now encode the reason in memory, which can be safely overwritten as we're about to revert. The encoded
// message will have the following layout:
// [ revert reason identifier ] [ string location offset ] [ string length ] [ string contents ]
// The Solidity revert reason identifier is 0x08c739a0, the function selector of the Error(string) function. We
// also write zeroes to the next 28 bytes of memory, but those are about to be overwritten.
mstore(0x0, 0x08c379a000000000000000000000000000000000000000000000000000000000)
// Next is the offset to the location of the string, which will be placed immediately after (20 bytes away).
mstore(0x04, 0x0000000000000000000000000000000000000000000000000000000000000020)
// The string length is fixed: 7 characters.
mstore(0x24, 7)
// Finally, the string itself is stored.
mstore(0x44, revertReason)
// Even if the string is only 7 bytes long, we need to return a full 32 byte slot containing it. The length of
// the encoded message is therefore 4 + 32 + 32 + 32 = 100.
revert(0, 100)
}
}
library Errors {
// Math
uint256 internal constant ADD_OVERFLOW = 0;
uint256 internal constant SUB_OVERFLOW = 1;
uint256 internal constant SUB_UNDERFLOW = 2;
uint256 internal constant MUL_OVERFLOW = 3;
uint256 internal constant ZERO_DIVISION = 4;
uint256 internal constant DIV_INTERNAL = 5;
uint256 internal constant X_OUT_OF_BOUNDS = 6;
uint256 internal constant Y_OUT_OF_BOUNDS = 7;
uint256 internal constant PRODUCT_OUT_OF_BOUNDS = 8;
uint256 internal constant INVALID_EXPONENT = 9;
// Input
uint256 internal constant OUT_OF_BOUNDS = 100;
uint256 internal constant UNSORTED_ARRAY = 101;
uint256 internal constant UNSORTED_TOKENS = 102;
uint256 internal constant INPUT_LENGTH_MISMATCH = 103;
uint256 internal constant ZERO_TOKEN = 104;
uint256 internal constant INSUFFICIENT_DATA = 105;
// Shared pools
uint256 internal constant MIN_TOKENS = 200;
uint256 internal constant MAX_TOKENS = 201;
uint256 internal constant MAX_SWAP_FEE_PERCENTAGE = 202;
uint256 internal constant MIN_SWAP_FEE_PERCENTAGE = 203;
uint256 internal constant MINIMUM_BPT = 204;
uint256 internal constant CALLER_NOT_VAULT = 205;
uint256 internal constant UNINITIALIZED = 206;
uint256 internal constant BPT_IN_MAX_AMOUNT = 207;
uint256 internal constant BPT_OUT_MIN_AMOUNT = 208;
uint256 internal constant EXPIRED_PERMIT = 209;
uint256 internal constant NOT_TWO_TOKENS = 210;
uint256 internal constant DISABLED = 211;
// Pools
uint256 internal constant MIN_AMP = 300;
uint256 internal constant MAX_AMP = 301;
uint256 internal constant MIN_WEIGHT = 302;
uint256 internal constant MAX_STABLE_TOKENS = 303;
uint256 internal constant MAX_IN_RATIO = 304;
uint256 internal constant MAX_OUT_RATIO = 305;
uint256 internal constant MIN_BPT_IN_FOR_TOKEN_OUT = 306;
uint256 internal constant MAX_OUT_BPT_FOR_TOKEN_IN = 307;
uint256 internal constant NORMALIZED_WEIGHT_INVARIANT = 308;
uint256 internal constant INVALID_TOKEN = 309;
uint256 internal constant UNHANDLED_JOIN_KIND = 310;
uint256 internal constant ZERO_INVARIANT = 311;
uint256 internal constant ORACLE_INVALID_SECONDS_QUERY = 312;
uint256 internal constant ORACLE_NOT_INITIALIZED = 313;
uint256 internal constant ORACLE_QUERY_TOO_OLD = 314;
uint256 internal constant ORACLE_INVALID_INDEX = 315;
uint256 internal constant ORACLE_BAD_SECS = 316;
uint256 internal constant AMP_END_TIME_TOO_CLOSE = 317;
uint256 internal constant AMP_ONGOING_UPDATE = 318;
uint256 internal constant AMP_RATE_TOO_HIGH = 319;
uint256 internal constant AMP_NO_ONGOING_UPDATE = 320;
uint256 internal constant STABLE_INVARIANT_DIDNT_CONVERGE = 321;
uint256 internal constant STABLE_GET_BALANCE_DIDNT_CONVERGE = 322;
uint256 internal constant RELAYER_NOT_CONTRACT = 323;
uint256 internal constant BASE_POOL_RELAYER_NOT_CALLED = 324;
uint256 internal constant REBALANCING_RELAYER_REENTERED = 325;
uint256 internal constant GRADUAL_UPDATE_TIME_TRAVEL = 326;
uint256 internal constant SWAPS_DISABLED = 327;
uint256 internal constant CALLER_IS_NOT_LBP_OWNER = 328;
uint256 internal constant PRICE_RATE_OVERFLOW = 329;
uint256 internal constant INVALID_JOIN_EXIT_KIND_WHILE_SWAPS_DISABLED = 330;
uint256 internal constant WEIGHT_CHANGE_TOO_FAST = 331;
uint256 internal constant LOWER_GREATER_THAN_UPPER_TARGET = 332;
uint256 internal constant UPPER_TARGET_TOO_HIGH = 333;
uint256 internal constant UNHANDLED_BY_LINEAR_POOL = 334;
uint256 internal constant OUT_OF_TARGET_RANGE = 335;
uint256 internal constant UNHANDLED_EXIT_KIND = 336;
uint256 internal constant UNAUTHORIZED_EXIT = 337;
uint256 internal constant MAX_MANAGEMENT_SWAP_FEE_PERCENTAGE = 338;
uint256 internal constant UNHANDLED_BY_MANAGED_POOL = 339;
uint256 internal constant UNHANDLED_BY_PHANTOM_POOL = 340;
uint256 internal constant TOKEN_DOES_NOT_HAVE_RATE_PROVIDER = 341;
uint256 internal constant INVALID_INITIALIZATION = 342;
uint256 internal constant OUT_OF_NEW_TARGET_RANGE = 343;
uint256 internal constant FEATURE_DISABLED = 344;
uint256 internal constant UNINITIALIZED_POOL_CONTROLLER = 345;
uint256 internal constant SET_SWAP_FEE_DURING_FEE_CHANGE = 346;
uint256 internal constant SET_SWAP_FEE_PENDING_FEE_CHANGE = 347;
uint256 internal constant CHANGE_TOKENS_DURING_WEIGHT_CHANGE = 348;
uint256 internal constant CHANGE_TOKENS_PENDING_WEIGHT_CHANGE = 349;
uint256 internal constant MAX_WEIGHT = 350;
uint256 internal constant UNAUTHORIZED_JOIN = 351;
uint256 internal constant MAX_MANAGEMENT_AUM_FEE_PERCENTAGE = 352;
uint256 internal constant FRACTIONAL_TARGET = 353;
uint256 internal constant ADD_OR_REMOVE_BPT = 354;
uint256 internal constant INVALID_CIRCUIT_BREAKER_BOUNDS = 355;
uint256 internal constant CIRCUIT_BREAKER_TRIPPED = 356;
uint256 internal constant MALICIOUS_QUERY_REVERT = 357;
uint256 internal constant JOINS_EXITS_DISABLED = 358;
// Lib
uint256 internal constant REENTRANCY = 400;
uint256 internal constant SENDER_NOT_ALLOWED = 401;
uint256 internal constant PAUSED = 402;
uint256 internal constant PAUSE_WINDOW_EXPIRED = 403;
uint256 internal constant MAX_PAUSE_WINDOW_DURATION = 404;
uint256 internal constant MAX_BUFFER_PERIOD_DURATION = 405;
uint256 internal constant INSUFFICIENT_BALANCE = 406;
uint256 internal constant INSUFFICIENT_ALLOWANCE = 407;
uint256 internal constant ERC20_TRANSFER_FROM_ZERO_ADDRESS = 408;
uint256 internal constant ERC20_TRANSFER_TO_ZERO_ADDRESS = 409;
uint256 internal constant ERC20_MINT_TO_ZERO_ADDRESS = 410;
uint256 internal constant ERC20_BURN_FROM_ZERO_ADDRESS = 411;
uint256 internal constant ERC20_APPROVE_FROM_ZERO_ADDRESS = 412;
uint256 internal constant ERC20_APPROVE_TO_ZERO_ADDRESS = 413;
uint256 internal constant ERC20_TRANSFER_EXCEEDS_ALLOWANCE = 414;
uint256 internal constant ERC20_DECREASED_ALLOWANCE_BELOW_ZERO = 415;
uint256 internal constant ERC20_TRANSFER_EXCEEDS_BALANCE = 416;
uint256 internal constant ERC20_BURN_EXCEEDS_ALLOWANCE = 417;
uint256 internal constant SAFE_ERC20_CALL_FAILED = 418;
uint256 internal constant ADDRESS_INSUFFICIENT_BALANCE = 419;
uint256 internal constant ADDRESS_CANNOT_SEND_VALUE = 420;
uint256 internal constant SAFE_CAST_VALUE_CANT_FIT_INT256 = 421;
uint256 internal constant GRANT_SENDER_NOT_ADMIN = 422;
uint256 internal constant REVOKE_SENDER_NOT_ADMIN = 423;
uint256 internal constant RENOUNCE_SENDER_NOT_ALLOWED = 424;
uint256 internal constant BUFFER_PERIOD_EXPIRED = 425;
uint256 internal constant CALLER_IS_NOT_OWNER = 426;
uint256 internal constant NEW_OWNER_IS_ZERO = 427;
uint256 internal constant CODE_DEPLOYMENT_FAILED = 428;
uint256 internal constant CALL_TO_NON_CONTRACT = 429;
uint256 internal constant LOW_LEVEL_CALL_FAILED = 430;
uint256 internal constant NOT_PAUSED = 431;
uint256 internal constant ADDRESS_ALREADY_ALLOWLISTED = 432;
uint256 internal constant ADDRESS_NOT_ALLOWLISTED = 433;
uint256 internal constant ERC20_BURN_EXCEEDS_BALANCE = 434;
uint256 internal constant INVALID_OPERATION = 435;
uint256 internal constant CODEC_OVERFLOW = 436;
uint256 internal constant IN_RECOVERY_MODE = 437;
uint256 internal constant NOT_IN_RECOVERY_MODE = 438;
uint256 internal constant INDUCED_FAILURE = 439;
uint256 internal constant EXPIRED_SIGNATURE = 440;
uint256 internal constant MALFORMED_SIGNATURE = 441;
uint256 internal constant SAFE_CAST_VALUE_CANT_FIT_UINT64 = 442;
uint256 internal constant UNHANDLED_FEE_TYPE = 443;
uint256 internal constant BURN_FROM_ZERO = 444;
// Vault
uint256 internal constant INVALID_POOL_ID = 500;
uint256 internal constant CALLER_NOT_POOL = 501;
uint256 internal constant SENDER_NOT_ASSET_MANAGER = 502;
uint256 internal constant USER_DOESNT_ALLOW_RELAYER = 503;
uint256 internal constant INVALID_SIGNATURE = 504;
uint256 internal constant EXIT_BELOW_MIN = 505;
uint256 internal constant JOIN_ABOVE_MAX = 506;
uint256 internal constant SWAP_LIMIT = 507;
uint256 internal constant SWAP_DEADLINE = 508;
uint256 internal constant CANNOT_SWAP_SAME_TOKEN = 509;
uint256 internal constant UNKNOWN_AMOUNT_IN_FIRST_SWAP = 510;
uint256 internal constant MALCONSTRUCTED_MULTIHOP_SWAP = 511;
uint256 internal constant INTERNAL_BALANCE_OVERFLOW = 512;
uint256 internal constant INSUFFICIENT_INTERNAL_BALANCE = 513;
uint256 internal constant INVALID_ETH_INTERNAL_BALANCE = 514;
uint256 internal constant INVALID_POST_LOAN_BALANCE = 515;
uint256 internal constant INSUFFICIENT_ETH = 516;
uint256 internal constant UNALLOCATED_ETH = 517;
uint256 internal constant ETH_TRANSFER = 518;
uint256 internal constant CANNOT_USE_ETH_SENTINEL = 519;
uint256 internal constant TOKENS_MISMATCH = 520;
uint256 internal constant TOKEN_NOT_REGISTERED = 521;
uint256 internal constant TOKEN_ALREADY_REGISTERED = 522;
uint256 internal constant TOKENS_ALREADY_SET = 523;
uint256 internal constant TOKENS_LENGTH_MUST_BE_2 = 524;
uint256 internal constant NONZERO_TOKEN_BALANCE = 525;
uint256 internal constant BALANCE_TOTAL_OVERFLOW = 526;
uint256 internal constant POOL_NO_TOKENS = 527;
uint256 internal constant INSUFFICIENT_FLASH_LOAN_BALANCE = 528;
// Fees
uint256 internal constant SWAP_FEE_PERCENTAGE_TOO_HIGH = 600;
uint256 internal constant FLASH_LOAN_FEE_PERCENTAGE_TOO_HIGH = 601;
uint256 internal constant INSUFFICIENT_FLASH_LOAN_FEE_AMOUNT = 602;
uint256 internal constant AUM_FEE_PERCENTAGE_TOO_HIGH = 603;
// FeeSplitter
uint256 internal constant SPLITTER_FEE_PERCENTAGE_TOO_HIGH = 700;
// Misc
uint256 internal constant UNIMPLEMENTED = 998;
uint256 internal constant SHOULD_NOT_HAPPEN = 999;
}// SPDX-License-Identifier: GPL-3.0-or-later
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
pragma solidity >=0.7.0 <0.9.0;
interface IAuthentication {
/**
* @dev Returns the action identifier associated with the external function described by `selector`.
*/
function getActionId(bytes4 selector) external view returns (bytes32);
}// SPDX-License-Identifier: GPL-3.0-or-later
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
pragma solidity >=0.7.0 <0.9.0;
/**
* @dev Interface for the SignatureValidator helper, used to support meta-transactions.
*/
interface ISignaturesValidator {
/**
* @dev Returns the EIP712 domain separator.
*/
function getDomainSeparator() external view returns (bytes32);
/**
* @dev Returns the next nonce used by an address to sign messages.
*/
function getNextNonce(address user) external view returns (uint256);
}// SPDX-License-Identifier: GPL-3.0-or-later
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
pragma solidity >=0.7.0 <0.9.0;
/**
* @dev Interface for the TemporarilyPausable helper.
*/
interface ITemporarilyPausable {
/**
* @dev Emitted every time the pause state changes by `_setPaused`.
*/
event PausedStateChanged(bool paused);
/**
* @dev Returns the current paused state.
*/
function getPausedState()
external
view
returns (
bool paused,
uint256 pauseWindowEndTime,
uint256 bufferPeriodEndTime
);
}// SPDX-License-Identifier: GPL-3.0-or-later
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
pragma solidity >=0.7.0 <0.9.0;
/**
* @notice Simple interface to retrieve the version of a deployed contract.
*/
interface IVersion {
/**
* @dev Returns a JSON representation of the contract version containing name, version number and task ID.
*/
function version() external view returns (string memory);
}// SPDX-License-Identifier: GPL-3.0-or-later
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
pragma solidity >=0.7.0 <0.9.0;
import "../openzeppelin/IERC20.sol";
/**
* @dev Interface for WETH9.
* See https://github.com/gnosis/canonical-weth/blob/0dd1ea3e295eef916d0c6223ec63141137d22d67/contracts/WETH9.sol
*/
interface IWETH is IERC20 {
function deposit() external payable;
function withdraw(uint256 amount) external;
}// SPDX-License-Identifier: MIT
pragma solidity >=0.7.0 <0.9.0;
/**
* @dev Interface of the ERC20 standard as defined in the EIP.
*/
interface IERC20 {
/**
* @dev Returns the amount of tokens in existence.
*/
function totalSupply() external view returns (uint256);
/**
* @dev Returns the amount of tokens owned by `account`.
*/
function balanceOf(address account) external view returns (uint256);
/**
* @dev Moves `amount` tokens from the caller's account to `recipient`.
*
* Returns a boolean value indicating whether the operation succeeded.
*
* Emits a {Transfer} event.
*/
function transfer(address recipient, uint256 amount) external returns (bool);
/**
* @dev Returns the remaining number of tokens that `spender` will be
* allowed to spend on behalf of `owner` through {transferFrom}. This is
* zero by default.
*
* This value changes when {approve} or {transferFrom} are called.
*/
function allowance(address owner, address spender) external view returns (uint256);
/**
* @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
*
* Returns a boolean value indicating whether the operation succeeded.
*
* IMPORTANT: Beware that changing an allowance with this method brings the risk
* that someone may use both the old and the new allowance by unfortunate
* transaction ordering. One possible solution to mitigate this race
* condition is to first reduce the spender's allowance to 0 and set the
* desired value afterwards:
* https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
*
* Emits an {Approval} event.
*/
function approve(address spender, uint256 amount) external returns (bool);
/**
* @dev Moves `amount` tokens from `sender` to `recipient` using the
* allowance mechanism. `amount` is then deducted from the caller's
* allowance.
*
* Returns a boolean value indicating whether the operation succeeded.
*
* Emits a {Transfer} event.
*/
function transferFrom(
address sender,
address recipient,
uint256 amount
) external returns (bool);
/**
* @dev Emitted when `value` tokens are moved from one account (`from`) to
* another (`to`).
*
* Note that `value` may be zero.
*/
event Transfer(address indexed from, address indexed to, uint256 value);
/**
* @dev Emitted when the allowance of a `spender` for an `owner` is set by
* a call to {approve}. `value` is the new allowance.
*/
event Approval(address indexed owner, address indexed spender, uint256 value);
}// SPDX-License-Identifier: GPL-3.0-or-later
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
pragma solidity >=0.7.0 <0.9.0;
pragma experimental ABIEncoderV2;
import "../vault/IVault.sol";
/**
* @title IBalancerRelayer
* @notice Allows safe multicall execution of a relayer's functions
*/
interface IBalancerRelayer {
function getLibrary() external view returns (address);
function getQueryLibrary() external view returns (address);
function getVault() external view returns (IVault);
function multicall(bytes[] calldata data) external payable returns (bytes[] memory results);
function vaultActionsQueryMulticall(bytes[] calldata data) external returns (bytes[] memory results);
}// SPDX-License-Identifier: GPL-3.0-or-later
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
pragma solidity >=0.7.0 <0.9.0;
/**
* @dev This is an empty interface used to represent either ERC20-conforming token contracts or ETH (using the zero
* address sentinel value). We're just relying on the fact that `interface` can be used to declare new address-like
* types.
*
* This concept is unrelated to a Pool's Asset Managers.
*/
interface IAsset {
// solhint-disable-previous-line no-empty-blocks
}// SPDX-License-Identifier: GPL-3.0-or-later
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
pragma solidity >=0.7.0 <0.9.0;
interface IAuthorizer {
/**
* @dev Returns true if `account` can perform the action described by `actionId` in the contract `where`.
*/
function canPerform(
bytes32 actionId,
address account,
address where
) external view returns (bool);
}// SPDX-License-Identifier: GPL-3.0-or-later
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
pragma solidity >=0.7.0 <0.9.0;
pragma experimental ABIEncoderV2;
import "./IVault.sol";
import "./IPoolSwapStructs.sol";
/**
* @dev Interface for adding and removing liquidity that all Pool contracts should implement. Note that this is not
* the complete Pool contract interface, as it is missing the swap hooks. Pool contracts should also inherit from
* either IGeneralPool or IMinimalSwapInfoPool
*/
interface IBasePool is IPoolSwapStructs {
/**
* @dev Called by the Vault when a user calls `IVault.joinPool` to add liquidity to this Pool. Returns how many of
* each registered token the user should provide, as well as the amount of protocol fees the Pool owes to the Vault.
* The Vault will then take tokens from `sender` and add them to the Pool's balances, as well as collect
* the reported amount in protocol fees, which the pool should calculate based on `protocolSwapFeePercentage`.
*
* Protocol fees are reported and charged on join events so that the Pool is free of debt whenever new users join.
*
* `sender` is the account performing the join (from which tokens will be withdrawn), and `recipient` is the account
* designated to receive any benefits (typically pool shares). `balances` contains the total balances
* for each token the Pool registered in the Vault, in the same order that `IVault.getPoolTokens` would return.
*
* `lastChangeBlock` is the last block in which *any* of the Pool's registered tokens last changed its total
* balance.
*
* `userData` contains any pool-specific instructions needed to perform the calculations, such as the type of
* join (e.g., proportional given an amount of pool shares, single-asset, multi-asset, etc.)
*
* Contracts implementing this function should check that the caller is indeed the Vault before performing any
* state-changing operations, such as minting pool shares.
*/
function onJoinPool(
bytes32 poolId,
address sender,
address recipient,
uint256[] memory balances,
uint256 lastChangeBlock,
uint256 protocolSwapFeePercentage,
bytes memory userData
) external returns (uint256[] memory amountsIn, uint256[] memory dueProtocolFeeAmounts);
/**
* @dev Called by the Vault when a user calls `IVault.exitPool` to remove liquidity from this Pool. Returns how many
* tokens the Vault should deduct from the Pool's balances, as well as the amount of protocol fees the Pool owes
* to the Vault. The Vault will then take tokens from the Pool's balances and send them to `recipient`,
* as well as collect the reported amount in protocol fees, which the Pool should calculate based on
* `protocolSwapFeePercentage`.
*
* Protocol fees are charged on exit events to guarantee that users exiting the Pool have paid their share.
*
* `sender` is the account performing the exit (typically the pool shareholder), and `recipient` is the account
* to which the Vault will send the proceeds. `balances` contains the total token balances for each token
* the Pool registered in the Vault, in the same order that `IVault.getPoolTokens` would return.
*
* `lastChangeBlock` is the last block in which *any* of the Pool's registered tokens last changed its total
* balance.
*
* `userData` contains any pool-specific instructions needed to perform the calculations, such as the type of
* exit (e.g., proportional given an amount of pool shares, single-asset, multi-asset, etc.)
*
* Contracts implementing this function should check that the caller is indeed the Vault before performing any
* state-changing operations, such as burning pool shares.
*/
function onExitPool(
bytes32 poolId,
address sender,
address recipient,
uint256[] memory balances,
uint256 lastChangeBlock,
uint256 protocolSwapFeePercentage,
bytes memory userData
) external returns (uint256[] memory amountsOut, uint256[] memory dueProtocolFeeAmounts);
/**
* @dev Returns this Pool's ID, used when interacting with the Vault (to e.g. join the Pool or swap with it).
*/
function getPoolId() external view returns (bytes32);
/**
* @dev Returns the current swap fee percentage as a 18 decimal fixed point number, so e.g. 1e17 corresponds to a
* 10% swap fee.
*/
function getSwapFeePercentage() external view returns (uint256);
/**
* @dev Returns the scaling factors of each of the Pool's tokens. This is an implementation detail that is typically
* not relevant for outside parties, but which might be useful for some types of Pools.
*/
function getScalingFactors() external view returns (uint256[] memory);
function queryJoin(
bytes32 poolId,
address sender,
address recipient,
uint256[] memory balances,
uint256 lastChangeBlock,
uint256 protocolSwapFeePercentage,
bytes memory userData
) external returns (uint256 bptOut, uint256[] memory amountsIn);
function queryExit(
bytes32 poolId,
address sender,
address recipient,
uint256[] memory balances,
uint256 lastChangeBlock,
uint256 protocolSwapFeePercentage,
bytes memory userData
) external returns (uint256 bptIn, uint256[] memory amountsOut);
}// SPDX-License-Identifier: GPL-3.0-or-later
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
pragma solidity >=0.7.0 <0.9.0;
// Inspired by Aave Protocol's IFlashLoanReceiver.
import "../solidity-utils/openzeppelin/IERC20.sol";
interface IFlashLoanRecipient {
/**
* @dev When `flashLoan` is called on the Vault, it invokes the `receiveFlashLoan` hook on the recipient.
*
* At the time of the call, the Vault will have transferred `amounts` for `tokens` to the recipient. Before this
* call returns, the recipient must have transferred `amounts` plus `feeAmounts` for each token back to the
* Vault, or else the entire flash loan will revert.
*
* `userData` is the same value passed in the `IVault.flashLoan` call.
*/
function receiveFlashLoan(
IERC20[] memory tokens,
uint256[] memory amounts,
uint256[] memory feeAmounts,
bytes memory userData
) external;
}// SPDX-License-Identifier: GPL-3.0-or-later
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
pragma solidity >=0.7.0 <0.9.0;
pragma experimental ABIEncoderV2;
import "../solidity-utils/openzeppelin/IERC20.sol";
import "./IVault.sol";
interface IPoolSwapStructs {
// This is not really an interface - it just defines common structs used by other interfaces: IGeneralPool and
// IMinimalSwapInfoPool.
//
// This data structure represents a request for a token swap, where `kind` indicates the swap type ('given in' or
// 'given out') which indicates whether or not the amount sent by the pool is known.
//
// The pool receives `tokenIn` and sends `tokenOut`. `amount` is the number of `tokenIn` tokens the pool will take
// in, or the number of `tokenOut` tokens the Pool will send out, depending on the given swap `kind`.
//
// All other fields are not strictly necessary for most swaps, but are provided to support advanced scenarios in
// some Pools.
//
// `poolId` is the ID of the Pool involved in the swap - this is useful for Pool contracts that implement more than
// one Pool.
//
// The meaning of `lastChangeBlock` depends on the Pool specialization:
// - Two Token or Minimal Swap Info: the last block in which either `tokenIn` or `tokenOut` changed its total
// balance.
// - General: the last block in which *any* of the Pool's registered tokens changed its total balance.
//
// `from` is the origin address for the funds the Pool receives, and `to` is the destination address
// where the Pool sends the outgoing tokens.
//
// `userData` is extra data provided by the caller - typically a signature from a trusted party.
struct SwapRequest {
IVault.SwapKind kind;
IERC20 tokenIn;
IERC20 tokenOut;
uint256 amount;
// Misc data
bytes32 poolId;
uint256 lastChangeBlock;
address from;
address to;
bytes userData;
}
}// SPDX-License-Identifier: GPL-3.0-or-later
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
pragma solidity >=0.7.0 <0.9.0;
pragma experimental ABIEncoderV2;
import "../solidity-utils/openzeppelin/IERC20.sol";
import "./IVault.sol";
import "./IAuthorizer.sol";
interface IProtocolFeesCollector {
event SwapFeePercentageChanged(uint256 newSwapFeePercentage);
event FlashLoanFeePercentageChanged(uint256 newFlashLoanFeePercentage);
function withdrawCollectedFees(
IERC20[] calldata tokens,
uint256[] calldata amounts,
address recipient
) external;
function setSwapFeePercentage(uint256 newSwapFeePercentage) external;
function setFlashLoanFeePercentage(uint256 newFlashLoanFeePercentage) external;
function getSwapFeePercentage() external view returns (uint256);
function getFlashLoanFeePercentage() external view returns (uint256);
function getCollectedFeeAmounts(IERC20[] memory tokens) external view returns (uint256[] memory feeAmounts);
function getAuthorizer() external view returns (IAuthorizer);
function vault() external view returns (IVault);
}// SPDX-License-Identifier: GPL-3.0-or-later
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
pragma experimental ABIEncoderV2;
import "../solidity-utils/openzeppelin/IERC20.sol";
import "../solidity-utils/helpers/IAuthentication.sol";
import "../solidity-utils/helpers/ISignaturesValidator.sol";
import "../solidity-utils/helpers/ITemporarilyPausable.sol";
import "../solidity-utils/misc/IWETH.sol";
import "./IAsset.sol";
import "./IAuthorizer.sol";
import "./IFlashLoanRecipient.sol";
import "./IProtocolFeesCollector.sol";
pragma solidity >=0.7.0 <0.9.0;
/**
* @dev Full external interface for the Vault core contract - no external or public methods exist in the contract that
* don't override one of these declarations.
*/
interface IVault is ISignaturesValidator, ITemporarilyPausable, IAuthentication {
// Generalities about the Vault:
//
// - Whenever documentation refers to 'tokens', it strictly refers to ERC20-compliant token contracts. Tokens are
// transferred out of the Vault by calling the `IERC20.transfer` function, and transferred in by calling
// `IERC20.transferFrom`. In these cases, the sender must have previously allowed the Vault to use their tokens by
// calling `IERC20.approve`. The only deviation from the ERC20 standard that is supported is functions not returning
// a boolean value: in these scenarios, a non-reverting call is assumed to be successful.
//
// - All non-view functions in the Vault are non-reentrant: calling them while another one is mid-execution (e.g.
// while execution control is transferred to a token contract during a swap) will result in a revert. View
// functions can be called in a re-reentrant way, but doing so might cause them to return inconsistent results.
// Contracts calling view functions in the Vault must make sure the Vault has not already been entered.
//
// - View functions revert if referring to either unregistered Pools, or unregistered tokens for registered Pools.
// Authorizer
//
// Some system actions are permissioned, like setting and collecting protocol fees. This permissioning system exists
// outside of the Vault in the Authorizer contract: the Vault simply calls the Authorizer to check if the caller
// can perform a given action.
/**
* @dev Returns the Vault's Authorizer.
*/
function getAuthorizer() external view returns (IAuthorizer);
/**
* @dev Sets a new Authorizer for the Vault. The caller must be allowed by the current Authorizer to do this.
*
* Emits an `AuthorizerChanged` event.
*/
function setAuthorizer(IAuthorizer newAuthorizer) external;
/**
* @dev Emitted when a new authorizer is set by `setAuthorizer`.
*/
event AuthorizerChanged(IAuthorizer indexed newAuthorizer);
// Relayers
//
// Additionally, it is possible for an account to perform certain actions on behalf of another one, using their
// Vault ERC20 allowance and Internal Balance. These accounts are said to be 'relayers' for these Vault functions,
// and are expected to be smart contracts with sound authentication mechanisms. For an account to be able to wield
// this power, two things must occur:
// - The Authorizer must grant the account the permission to be a relayer for the relevant Vault function. This
// means that Balancer governance must approve each individual contract to act as a relayer for the intended
// functions.
// - Each user must approve the relayer to act on their behalf.
// This double protection means users cannot be tricked into approving malicious relayers (because they will not
// have been allowed by the Authorizer via governance), nor can malicious relayers approved by a compromised
// Authorizer or governance drain user funds, since they would also need to be approved by each individual user.
/**
* @dev Returns true if `user` has approved `relayer` to act as a relayer for them.
*/
function hasApprovedRelayer(address user, address relayer) external view returns (bool);
/**
* @dev Allows `relayer` to act as a relayer for `sender` if `approved` is true, and disallows it otherwise.
*
* Emits a `RelayerApprovalChanged` event.
*/
function setRelayerApproval(
address sender,
address relayer,
bool approved
) external;
/**
* @dev Emitted every time a relayer is approved or disapproved by `setRelayerApproval`.
*/
event RelayerApprovalChanged(address indexed relayer, address indexed sender, bool approved);
// Internal Balance
//
// Users can deposit tokens into the Vault, where they are allocated to their Internal Balance, and later
// transferred or withdrawn. It can also be used as a source of tokens when joining Pools, as a destination
// when exiting them, and as either when performing swaps. This usage of Internal Balance results in greatly reduced
// gas costs when compared to relying on plain ERC20 transfers, leading to large savings for frequent users.
//
// Internal Balance management features batching, which means a single contract call can be used to perform multiple
// operations of different kinds, with different senders and recipients, at once.
/**
* @dev Returns `user`'s Internal Balance for a set of tokens.
*/
function getInternalBalance(address user, IERC20[] memory tokens) external view returns (uint256[] memory);
/**
* @dev Performs a set of user balance operations, which involve Internal Balance (deposit, withdraw or transfer)
* and plain ERC20 transfers using the Vault's allowance. This last feature is particularly useful for relayers, as
* it lets integrators reuse a user's Vault allowance.
*
* For each operation, if the caller is not `sender`, it must be an authorized relayer for them.
*/
function manageUserBalance(UserBalanceOp[] memory ops) external payable;
/**
* @dev Data for `manageUserBalance` operations, which include the possibility for ETH to be sent and received
without manual WETH wrapping or unwrapping.
*/
struct UserBalanceOp {
UserBalanceOpKind kind;
IAsset asset;
uint256 amount;
address sender;
address payable recipient;
}
// There are four possible operations in `manageUserBalance`:
//
// - DEPOSIT_INTERNAL
// Increases the Internal Balance of the `recipient` account by transferring tokens from the corresponding
// `sender`. The sender must have allowed the Vault to use their tokens via `IERC20.approve()`.
//
// ETH can be used by passing the ETH sentinel value as the asset and forwarding ETH in the call: it will be wrapped
// and deposited as WETH. Any ETH amount remaining will be sent back to the caller (not the sender, which is
// relevant for relayers).
//
// Emits an `InternalBalanceChanged` event.
//
//
// - WITHDRAW_INTERNAL
// Decreases the Internal Balance of the `sender` account by transferring tokens to the `recipient`.
//
// ETH can be used by passing the ETH sentinel value as the asset. This will deduct WETH instead, unwrap it and send
// it to the recipient as ETH.
//
// Emits an `InternalBalanceChanged` event.
//
//
// - TRANSFER_INTERNAL
// Transfers tokens from the Internal Balance of the `sender` account to the Internal Balance of `recipient`.
//
// Reverts if the ETH sentinel value is passed.
//
// Emits an `InternalBalanceChanged` event.
//
//
// - TRANSFER_EXTERNAL
// Transfers tokens from `sender` to `recipient`, using the Vault's ERC20 allowance. This is typically used by
// relayers, as it lets them reuse a user's Vault allowance.
//
// Reverts if the ETH sentinel value is passed.
//
// Emits an `ExternalBalanceTransfer` event.
enum UserBalanceOpKind { DEPOSIT_INTERNAL, WITHDRAW_INTERNAL, TRANSFER_INTERNAL, TRANSFER_EXTERNAL }
/**
* @dev Emitted when a user's Internal Balance changes, either from calls to `manageUserBalance`, or through
* interacting with Pools using Internal Balance.
*
* Because Internal Balance works exclusively with ERC20 tokens, ETH deposits and withdrawals will use the WETH
* address.
*/
event InternalBalanceChanged(address indexed user, IERC20 indexed token, int256 delta);
/**
* @dev Emitted when a user's Vault ERC20 allowance is used by the Vault to transfer tokens to an external account.
*/
event ExternalBalanceTransfer(IERC20 indexed token, address indexed sender, address recipient, uint256 amount);
// Pools
//
// There are three specialization settings for Pools, which allow for cheaper swaps at the cost of reduced
// functionality:
//
// - General: no specialization, suited for all Pools. IGeneralPool is used for swap request callbacks, passing the
// balance of all tokens in the Pool. These Pools have the largest swap costs (because of the extra storage reads),
// which increase with the number of registered tokens.
//
// - Minimal Swap Info: IMinimalSwapInfoPool is used instead of IGeneralPool, which saves gas by only passing the
// balance of the two tokens involved in the swap. This is suitable for some pricing algorithms, like the weighted
// constant product one popularized by Balancer V1. Swap costs are smaller compared to general Pools, and are
// independent of the number of registered tokens.
//
// - Two Token: only allows two tokens to be registered. This achieves the lowest possible swap gas cost. Like
// minimal swap info Pools, these are called via IMinimalSwapInfoPool.
enum PoolSpecialization { GENERAL, MINIMAL_SWAP_INFO, TWO_TOKEN }
/**
* @dev Registers the caller account as a Pool with a given specialization setting. Returns the Pool's ID, which
* is used in all Pool-related functions. Pools cannot be deregistered, nor can the Pool's specialization be
* changed.
*
* The caller is expected to be a smart contract that implements either `IGeneralPool` or `IMinimalSwapInfoPool`,
* depending on the chosen specialization setting. This contract is known as the Pool's contract.
*
* Note that the same contract may register itself as multiple Pools with unique Pool IDs, or in other words,
* multiple Pools may share the same contract.
*
* Emits a `PoolRegistered` event.
*/
function registerPool(PoolSpecialization specialization) external returns (bytes32);
/**
* @dev Emitted when a Pool is registered by calling `registerPool`.
*/
event PoolRegistered(bytes32 indexed poolId, address indexed poolAddress, PoolSpecialization specialization);
/**
* @dev Returns a Pool's contract address and specialization setting.
*/
function getPool(bytes32 poolId) external view returns (address, PoolSpecialization);
/**
* @dev Registers `tokens` for the `poolId` Pool. Must be called by the Pool's contract.
*
* Pools can only interact with tokens they have registered. Users join a Pool by transferring registered tokens,
* exit by receiving registered tokens, and can only swap registered tokens.
*
* Each token can only be registered once. For Pools with the Two Token specialization, `tokens` must have a length
* of two, that is, both tokens must be registered in the same `registerTokens` call, and they must be sorted in
* ascending order.
*
* The `tokens` and `assetManagers` arrays must have the same length, and each entry in these indicates the Asset
* Manager for the corresponding token. Asset Managers can manage a Pool's tokens via `managePoolBalance`,
* depositing and withdrawing them directly, and can even set their balance to arbitrary amounts. They are therefore
* expected to be highly secured smart contracts with sound design principles, and the decision to register an
* Asset Manager should not be made lightly.
*
* Pools can choose not to assign an Asset Manager to a given token by passing in the zero address. Once an Asset
* Manager is set, it cannot be changed except by deregistering the associated token and registering again with a
* different Asset Manager.
*
* Emits a `TokensRegistered` event.
*/
function registerTokens(
bytes32 poolId,
IERC20[] memory tokens,
address[] memory assetManagers
) external;
/**
* @dev Emitted when a Pool registers tokens by calling `registerTokens`.
*/
event TokensRegistered(bytes32 indexed poolId, IERC20[] tokens, address[] assetManagers);
/**
* @dev Deregisters `tokens` for the `poolId` Pool. Must be called by the Pool's contract.
*
* Only registered tokens (via `registerTokens`) can be deregistered. Additionally, they must have zero total
* balance. For Pools with the Two Token specialization, `tokens` must have a length of two, that is, both tokens
* must be deregistered in the same `deregisterTokens` call.
*
* A deregistered token can be re-registered later on, possibly with a different Asset Manager.
*
* Emits a `TokensDeregistered` event.
*/
function deregisterTokens(bytes32 poolId, IERC20[] memory tokens) external;
/**
* @dev Emitted when a Pool deregisters tokens by calling `deregisterTokens`.
*/
event TokensDeregistered(bytes32 indexed poolId, IERC20[] tokens);
/**
* @dev Returns detailed information for a Pool's registered token.
*
* `cash` is the number of tokens the Vault currently holds for the Pool. `managed` is the number of tokens
* withdrawn and held outside the Vault by the Pool's token Asset Manager. The Pool's total balance for `token`
* equals the sum of `cash` and `managed`.
*
* Internally, `cash` and `managed` are stored using 112 bits. No action can ever cause a Pool's token `cash`,
* `managed` or `total` balance to be greater than 2^112 - 1.
*
* `lastChangeBlock` is the number of the block in which `token`'s total balance was last modified (via either a
* join, exit, swap, or Asset Manager update). This value is useful to avoid so-called 'sandwich attacks', for
* example when developing price oracles. A change of zero (e.g. caused by a swap with amount zero) is considered a
* change for this purpose, and will update `lastChangeBlock`.
*
* `assetManager` is the Pool's token Asset Manager.
*/
function getPoolTokenInfo(bytes32 poolId, IERC20 token)
external
view
returns (
uint256 cash,
uint256 managed,
uint256 lastChangeBlock,
address assetManager
);
/**
* @dev Returns a Pool's registered tokens, the total balance for each, and the latest block when *any* of
* the tokens' `balances` changed.
*
* The order of the `tokens` array is the same order that will be used in `joinPool`, `exitPool`, as well as in all
* Pool hooks (where applicable). Calls to `registerTokens` and `deregisterTokens` may change this order.
*
* If a Pool only registers tokens once, and these are sorted in ascending order, they will be stored in the same
* order as passed to `registerTokens`.
*
* Total balances include both tokens held by the Vault and those withdrawn by the Pool's Asset Managers. These are
* the amounts used by joins, exits and swaps. For a detailed breakdown of token balances, use `getPoolTokenInfo`
* instead.
*/
function getPoolTokens(bytes32 poolId)
external
view
returns (
IERC20[] memory tokens,
uint256[] memory balances,
uint256 lastChangeBlock
);
/**
* @dev Called by users to join a Pool, which transfers tokens from `sender` into the Pool's balance. This will
* trigger custom Pool behavior, which will typically grant something in return to `recipient` - often tokenized
* Pool shares.
*
* If the caller is not `sender`, it must be an authorized relayer for them.
*
* The `assets` and `maxAmountsIn` arrays must have the same length, and each entry indicates the maximum amount
* to send for each asset. The amounts to send are decided by the Pool and not the Vault: it just enforces
* these maximums.
*
* If joining a Pool that holds WETH, it is possible to send ETH directly: the Vault will do the wrapping. To enable
* this mechanism, the IAsset sentinel value (the zero address) must be passed in the `assets` array instead of the
* WETH address. Note that it is not possible to combine ETH and WETH in the same join. Any excess ETH will be sent
* back to the caller (not the sender, which is important for relayers).
*
* `assets` must have the same length and order as the array returned by `getPoolTokens`. This prevents issues when
* interacting with Pools that register and deregister tokens frequently. If sending ETH however, the array must be
* sorted *before* replacing the WETH address with the ETH sentinel value (the zero address), which means the final
* `assets` array might not be sorted. Pools with no registered tokens cannot be joined.
*
* If `fromInternalBalance` is true, the caller's Internal Balance will be preferred: ERC20 transfers will only
* be made for the difference between the requested amount and Internal Balance (if any). Note that ETH cannot be
* withdrawn from Internal Balance: attempting to do so will trigger a revert.
*
* This causes the Vault to call the `IBasePool.onJoinPool` hook on the Pool's contract, where Pools implement
* their own custom logic. This typically requires additional information from the user (such as the expected number
* of Pool shares). This can be encoded in the `userData` argument, which is ignored by the Vault and passed
* directly to the Pool's contract, as is `recipient`.
*
* Emits a `PoolBalanceChanged` event.
*/
function joinPool(
bytes32 poolId,
address sender,
address recipient,
JoinPoolRequest memory request
) external payable;
struct JoinPoolRequest {
IAsset[] assets;
uint256[] maxAmountsIn;
bytes userData;
bool fromInternalBalance;
}
/**
* @dev Called by users to exit a Pool, which transfers tokens from the Pool's balance to `recipient`. This will
* trigger custom Pool behavior, which will typically ask for something in return from `sender` - often tokenized
* Pool shares. The amount of tokens that can be withdrawn is limited by the Pool's `cash` balance (see
* `getPoolTokenInfo`).
*
* If the caller is not `sender`, it must be an authorized relayer for them.
*
* The `tokens` and `minAmountsOut` arrays must have the same length, and each entry in these indicates the minimum
* token amount to receive for each token contract. The amounts to send are decided by the Pool and not the Vault:
* it just enforces these minimums.
*
* If exiting a Pool that holds WETH, it is possible to receive ETH directly: the Vault will do the unwrapping. To
* enable this mechanism, the IAsset sentinel value (the zero address) must be passed in the `assets` array instead
* of the WETH address. Note that it is not possible to combine ETH and WETH in the same exit.
*
* `assets` must have the same length and order as the array returned by `getPoolTokens`. This prevents issues when
* interacting with Pools that register and deregister tokens frequently. If receiving ETH however, the array must
* be sorted *before* replacing the WETH address with the ETH sentinel value (the zero address), which means the
* final `assets` array might not be sorted. Pools with no registered tokens cannot be exited.
*
* If `toInternalBalance` is true, the tokens will be deposited to `recipient`'s Internal Balance. Otherwise,
* an ERC20 transfer will be performed. Note that ETH cannot be deposited to Internal Balance: attempting to
* do so will trigger a revert.
*
* `minAmountsOut` is the minimum amount of tokens the user expects to get out of the Pool, for each token in the
* `tokens` array. This array must match the Pool's registered tokens.
*
* This causes the Vault to call the `IBasePool.onExitPool` hook on the Pool's contract, where Pools implement
* their own custom logic. This typically requires additional information from the user (such as the expected number
* of Pool shares to return). This can be encoded in the `userData` argument, which is ignored by the Vault and
* passed directly to the Pool's contract.
*
* Emits a `PoolBalanceChanged` event.
*/
function exitPool(
bytes32 poolId,
address sender,
address payable recipient,
ExitPoolRequest memory request
) external;
struct ExitPoolRequest {
IAsset[] assets;
uint256[] minAmountsOut;
bytes userData;
bool toInternalBalance;
}
/**
* @dev Emitted when a user joins or exits a Pool by calling `joinPool` or `exitPool`, respectively.
*/
event PoolBalanceChanged(
bytes32 indexed poolId,
address indexed liquidityProvider,
IERC20[] tokens,
int256[] deltas,
uint256[] protocolFeeAmounts
);
enum PoolBalanceChangeKind { JOIN, EXIT }
// Swaps
//
// Users can swap tokens with Pools by calling the `swap` and `batchSwap` functions. To do this,
// they need not trust Pool contracts in any way: all security checks are made by the Vault. They must however be
// aware of the Pools' pricing algorithms in order to estimate the prices Pools will quote.
//
// The `swap` function executes a single swap, while `batchSwap` can perform multiple swaps in sequence.
// In each individual swap, tokens of one kind are sent from the sender to the Pool (this is the 'token in'),
// and tokens of another kind are sent from the Pool to the recipient in exchange (this is the 'token out').
// More complex swaps, such as one token in to multiple tokens out can be achieved by batching together
// individual swaps.
//
// There are two swap kinds:
// - 'given in' swaps, where the amount of tokens in (sent to the Pool) is known, and the Pool determines (via the
// `onSwap` hook) the amount of tokens out (to send to the recipient).
// - 'given out' swaps, where the amount of tokens out (received from the Pool) is known, and the Pool determines
// (via the `onSwap` hook) the amount of tokens in (to receive from the sender).
//
// Additionally, it is possible to chain swaps using a placeholder input amount, which the Vault replaces with
// the calculated output of the previous swap. If the previous swap was 'given in', this will be the calculated
// tokenOut amount. If the previous swap was 'given out', it will use the calculated tokenIn amount. These extended
// swaps are known as 'multihop' swaps, since they 'hop' through a number of intermediate tokens before arriving at
// the final intended token.
//
// In all cases, tokens are only transferred in and out of the Vault (or withdrawn from and deposited into Internal
// Balance) after all individual swaps have been completed, and the net token balance change computed. This makes
// certain swap patterns, such as multihops, or swaps that interact with the same token pair in multiple Pools, cost
// much less gas than they would otherwise.
//
// It also means that under certain conditions it is possible to perform arbitrage by swapping with multiple
// Pools in a way that results in net token movement out of the Vault (profit), with no tokens being sent in (only
// updating the Pool's internal accounting).
//
// To protect users from front-running or the market changing rapidly, they supply a list of 'limits' for each token
// involved in the swap, where either the maximum number of tokens to send (by passing a positive value) or the
// minimum amount of tokens to receive (by passing a negative value) is specified.
//
// Additionally, a 'deadline' timestamp can also be provided, forcing the swap to fail if it occurs after
// this point in time (e.g. if the transaction failed to be included in a block promptly).
//
// If interacting with Pools that hold WETH, it is possible to both send and receive ETH directly: the Vault will do
// the wrapping and unwrapping. To enable this mechanism, the IAsset sentinel value (the zero address) must be
// passed in the `assets` array instead of the WETH address. Note that it is possible to combine ETH and WETH in the
// same swap. Any excess ETH will be sent back to the caller (not the sender, which is relevant for relayers).
//
// Finally, Internal Balance can be used when either sending or receiving tokens.
enum SwapKind { GIVEN_IN, GIVEN_OUT }
/**
* @dev Performs a swap with a single Pool.
*
* If the swap is 'given in' (the number of tokens to send to the Pool is known), it returns the amount of tokens
* taken from the Pool, which must be greater than or equal to `limit`.
*
* If the swap is 'given out' (the number of tokens to take from the Pool is known), it returns the amount of tokens
* sent to the Pool, which must be less than or equal to `limit`.
*
* Internal Balance usage and the recipient are determined by the `funds` struct.
*
* Emits a `Swap` event.
*/
function swap(
SingleSwap memory singleSwap,
FundManagement memory funds,
uint256 limit,
uint256 deadline
) external payable returns (uint256);
/**
* @dev Data for a single swap executed by `swap`. `amount` is either `amountIn` or `amountOut` depending on
* the `kind` value.
*
* `assetIn` and `assetOut` are either token addresses, or the IAsset sentinel value for ETH (the zero address).
* Note that Pools never interact with ETH directly: it will be wrapped to or unwrapped from WETH by the Vault.
*
* The `userData` field is ignored by the Vault, but forwarded to the Pool in the `onSwap` hook, and may be
* used to extend swap behavior.
*/
struct SingleSwap {
bytes32 poolId;
SwapKind kind;
IAsset assetIn;
IAsset assetOut;
uint256 amount;
bytes userData;
}
/**
* @dev Performs a series of swaps with one or multiple Pools. In each individual swap, the caller determines either
* the amount of tokens sent to or received from the Pool, depending on the `kind` value.
*
* Returns an array with the net Vault asset balance deltas. Positive amounts represent tokens (or ETH) sent to the
* Vault, and negative amounts represent tokens (or ETH) sent by the Vault. Each delta corresponds to the asset at
* the same index in the `assets` array.
*
* Swaps are executed sequentially, in the order specified by the `swaps` array. Each array element describes a
* Pool, the token to be sent to this Pool, the token to receive from it, and an amount that is either `amountIn` or
* `amountOut` depending on the swap kind.
*
* Multihop swaps can be executed by passing an `amount` value of zero for a swap. This will cause the amount in/out
* of the previous swap to be used as the amount in for the current one. In a 'given in' swap, 'tokenIn' must equal
* the previous swap's `tokenOut`. For a 'given out' swap, `tokenOut` must equal the previous swap's `tokenIn`.
*
* The `assets` array contains the addresses of all assets involved in the swaps. These are either token addresses,
* or the IAsset sentinel value for ETH (the zero address). Each entry in the `swaps` array specifies tokens in and
* out by referencing an index in `assets`. Note that Pools never interact with ETH directly: it will be wrapped to
* or unwrapped from WETH by the Vault.
*
* Internal Balance usage, sender, and recipient are determined by the `funds` struct. The `limits` array specifies
* the minimum or maximum amount of each token the vault is allowed to transfer.
*
* `batchSwap` can be used to make a single swap, like `swap` does, but doing so requires more gas than the
* equivalent `swap` call.
*
* Emits `Swap` events.
*/
function batchSwap(
SwapKind kind,
BatchSwapStep[] memory swaps,
IAsset[] memory assets,
FundManagement memory funds,
int256[] memory limits,
uint256 deadline
) external payable returns (int256[] memory);
/**
* @dev Data for each individual swap executed by `batchSwap`. The asset in and out fields are indexes into the
* `assets` array passed to that function, and ETH assets are converted to WETH.
*
* If `amount` is zero, the multihop mechanism is used to determine the actual amount based on the amount in/out
* from the previous swap, depending on the swap kind.
*
* The `userData` field is ignored by the Vault, but forwarded to the Pool in the `onSwap` hook, and may be
* used to extend swap behavior.
*/
struct BatchSwapStep {
bytes32 poolId;
uint256 assetInIndex;
uint256 assetOutIndex;
uint256 amount;
bytes userData;
}
/**
* @dev Emitted for each individual swap performed by `swap` or `batchSwap`.
*/
event Swap(
bytes32 indexed poolId,
IERC20 indexed tokenIn,
IERC20 indexed tokenOut,
uint256 amountIn,
uint256 amountOut
);
/**
* @dev All tokens in a swap are either sent from the `sender` account to the Vault, or from the Vault to the
* `recipient` account.
*
* If the caller is not `sender`, it must be an authorized relayer for them.
*
* If `fromInternalBalance` is true, the `sender`'s Internal Balance will be preferred, performing an ERC20
* transfer for the difference between the requested amount and the User's Internal Balance (if any). The `sender`
* must have allowed the Vault to use their tokens via `IERC20.approve()`. This matches the behavior of
* `joinPool`.
*
* If `toInternalBalance` is true, tokens will be deposited to `recipient`'s internal balance instead of
* transferred. This matches the behavior of `exitPool`.
*
* Note that ETH cannot be deposited to or withdrawn from Internal Balance: attempting to do so will trigger a
* revert.
*/
struct FundManagement {
address sender;
bool fromInternalBalance;
address payable recipient;
bool toInternalBalance;
}
/**
* @dev Simulates a call to `batchSwap`, returning an array of Vault asset deltas. Calls to `swap` cannot be
* simulated directly, but an equivalent `batchSwap` call can and will yield the exact same result.
*
* Each element in the array corresponds to the asset at the same index, and indicates the number of tokens (or ETH)
* the Vault would take from the sender (if positive) or send to the recipient (if negative). The arguments it
* receives are the same that an equivalent `batchSwap` call would receive.
*
* Unlike `batchSwap`, this function performs no checks on the sender or recipient field in the `funds` struct.
* This makes it suitable to be called by off-chain applications via eth_call without needing to hold tokens,
* approve them for the Vault, or even know a user's address.
*
* Note that this function is not 'view' (due to implementation details): the client code must explicitly execute
* eth_call instead of eth_sendTransaction.
*/
function queryBatchSwap(
SwapKind kind,
BatchSwapStep[] memory swaps,
IAsset[] memory assets,
FundManagement memory funds
) external returns (int256[] memory assetDeltas);
// Flash Loans
/**
* @dev Performs a 'flash loan', sending tokens to `recipient`, executing the `receiveFlashLoan` hook on it,
* and then reverting unless the tokens plus a proportional protocol fee have been returned.
*
* The `tokens` and `amounts` arrays must have the same length, and each entry in these indicates the loan amount
* for each token contract. `tokens` must be sorted in ascending order.
*
* The 'userData' field is ignored by the Vault, and forwarded as-is to `recipient` as part of the
* `receiveFlashLoan` call.
*
* Emits `FlashLoan` events.
*/
function flashLoan(
IFlashLoanRecipient recipient,
IERC20[] memory tokens,
uint256[] memory amounts,
bytes memory userData
) external;
/**
* @dev Emitted for each individual flash loan performed by `flashLoan`.
*/
event FlashLoan(IFlashLoanRecipient indexed recipient, IERC20 indexed token, uint256 amount, uint256 feeAmount);
// Asset Management
//
// Each token registered for a Pool can be assigned an Asset Manager, which is able to freely withdraw the Pool's
// tokens from the Vault, deposit them, or assign arbitrary values to its `managed` balance (see
// `getPoolTokenInfo`). This makes them extremely powerful and dangerous. Even if an Asset Manager only directly
// controls one of the tokens in a Pool, a malicious manager could set that token's balance to manipulate the
// prices of the other tokens, and then drain the Pool with swaps. The risk of using Asset Managers is therefore
// not constrained to the tokens they are managing, but extends to the entire Pool's holdings.
//
// However, a properly designed Asset Manager smart contract can be safely used for the Pool's benefit,
// for example by lending unused tokens out for interest, or using them to participate in voting protocols.
//
// This concept is unrelated to the IAsset interface.
/**
* @dev Performs a set of Pool balance operations, which may be either withdrawals, deposits or updates.
*
* Pool Balance management features batching, which means a single contract call can be used to perform multiple
* operations of different kinds, with different Pools and tokens, at once.
*
* For each operation, the caller must be registered as the Asset Manager for `token` in `poolId`.
*/
function managePoolBalance(PoolBalanceOp[] memory ops) external;
struct PoolBalanceOp {
PoolBalanceOpKind kind;
bytes32 poolId;
IERC20 token;
uint256 amount;
}
/**
* Withdrawals decrease the Pool's cash, but increase its managed balance, leaving the total balance unchanged.
*
* Deposits increase the Pool's cash, but decrease its managed balance, leaving the total balance unchanged.
*
* Updates don't affect the Pool's cash balance, but because the managed balance changes, it does alter the total.
* The external amount can be either increased or decreased by this call (i.e., reporting a gain or a loss).
*/
enum PoolBalanceOpKind { WITHDRAW, DEPOSIT, UPDATE }
/**
* @dev Emitted when a Pool's token Asset Manager alters its balance via `managePoolBalance`.
*/
event PoolBalanceManaged(
bytes32 indexed poolId,
address indexed assetManager,
IERC20 indexed token,
int256 cashDelta,
int256 managedDelta
);
// Protocol Fees
//
// Some operations cause the Vault to collect tokens in the form of protocol fees, which can then be withdrawn by
// permissioned accounts.
//
// There are two kinds of protocol fees:
//
// - flash loan fees: charged on all flash loans, as a percentage of the amounts lent.
//
// - swap fees: a percentage of the fees charged by Pools when performing swaps. For a number of reasons, including
// swap gas costs and interface simplicity, protocol swap fees are not charged on each individual swap. Rather,
// Pools are expected to keep track of how much they have charged in swap fees, and pay any outstanding debts to the
// Vault when they are joined or exited. This prevents users from joining a Pool with unpaid debt, as well as
// exiting a Pool in debt without first paying their share.
/**
* @dev Returns the current protocol fee module.
*/
function getProtocolFeesCollector() external view returns (IProtocolFeesCollector);
/**
* @dev Safety mechanism to pause most Vault operations in the event of an emergency - typically detection of an
* error in some part of the system.
*
* The Vault can only be paused during an initial time period, after which pausing is forever disabled.
*
* While the contract is paused, the following features are disabled:
* - depositing and transferring internal balance
* - transferring external balance (using the Vault's allowance)
* - swaps
* - joining Pools
* - Asset Manager interactions
*
* Internal Balance can still be withdrawn, and Pools exited.
*/
function setPaused(bool paused) external;
/**
* @dev Returns the Vault's WETH instance.
*/
function WETH() external view returns (IWETH);
// solhint-disable-previous-line func-name-mixedcase
}// SPDX-License-Identifier: GPL-3.0-or-later
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
pragma solidity ^0.7.0;
import "@balancer-labs/v2-interfaces/contracts/solidity-utils/openzeppelin/IERC20.sol";
import "@balancer-labs/v2-interfaces/contracts/solidity-utils/helpers/BalancerErrors.sol";
library InputHelpers {
function ensureInputLengthMatch(uint256 a, uint256 b) internal pure {
_require(a == b, Errors.INPUT_LENGTH_MISMATCH);
}
function ensureInputLengthMatch(
uint256 a,
uint256 b,
uint256 c
) internal pure {
_require(a == b && b == c, Errors.INPUT_LENGTH_MISMATCH);
}
function ensureArrayIsSorted(IERC20[] memory array) internal pure {
address[] memory addressArray;
// solhint-disable-next-line no-inline-assembly
assembly {
addressArray := array
}
ensureArrayIsSorted(addressArray);
}
function ensureArrayIsSorted(address[] memory array) internal pure {
if (array.length < 2) {
return;
}
address previous = array[0];
for (uint256 i = 1; i < array.length; ++i) {
address current = array[i];
_require(previous < current, Errors.UNSORTED_ARRAY);
previous = current;
}
}
}// SPDX-License-Identifier: GPL-3.0-or-later
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
pragma solidity ^0.7.0;
library VaultHelpers {
/**
* @dev Returns the address of a Pool's contract.
*
* This is the same code the Vault runs in `PoolRegistry._getPoolAddress`.
*/
function toPoolAddress(bytes32 poolId) internal pure returns (address) {
// 12 byte logical shift left to remove the nonce and specialization setting. We don't need to mask,
// since the logical shift already sets the upper bits to zero.
return address(uint256(poolId) >> (12 * 8));
}
}// SPDX-License-Identifier: GPL-3.0-or-later
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
pragma solidity ^0.7.0;
import "@balancer-labs/v2-interfaces/contracts/solidity-utils/helpers/IVersion.sol";
/**
* @notice Retrieves a contract's version set at creation time from storage.
*/
contract Version is IVersion {
string private _version;
constructor(string memory version) {
_setVersion(version);
}
function version() external view override returns (string memory) {
return _version;
}
/**
* @dev Internal setter that allows this contract to be used in proxies.
*/
function _setVersion(string memory newVersion) internal {
_version = newVersion;
}
}// SPDX-License-Identifier: MIT
pragma solidity ^0.7.0;
import "@balancer-labs/v2-interfaces/contracts/solidity-utils/helpers/BalancerErrors.sol";
/**
* @dev Wrappers over Solidity's arithmetic operations with added overflow checks.
* Adapted from OpenZeppelin's SafeMath library.
*/
library Math {
// solhint-disable no-inline-assembly
/**
* @dev Returns the absolute value of a signed integer.
*/
function abs(int256 a) internal pure returns (uint256 result) {
// Equivalent to:
// result = a > 0 ? uint256(a) : uint256(-a)
assembly {
let s := sar(255, a)
result := sub(xor(a, s), s)
}
}
/**
* @dev Returns the addition of two unsigned integers of 256 bits, reverting on overflow.
*/
function add(uint256 a, uint256 b) internal pure returns (uint256) {
uint256 c = a + b;
_require(c >= a, Errors.ADD_OVERFLOW);
return c;
}
/**
* @dev Returns the addition of two signed integers, reverting on overflow.
*/
function add(int256 a, int256 b) internal pure returns (int256) {
int256 c = a + b;
_require((b >= 0 && c >= a) || (b < 0 && c < a), Errors.ADD_OVERFLOW);
return c;
}
/**
* @dev Returns the subtraction of two unsigned integers of 256 bits, reverting on overflow.
*/
function sub(uint256 a, uint256 b) internal pure returns (uint256) {
_require(b <= a, Errors.SUB_OVERFLOW);
uint256 c = a - b;
return c;
}
/**
* @dev Returns the subtraction of two signed integers, reverting on overflow.
*/
function sub(int256 a, int256 b) internal pure returns (int256) {
int256 c = a - b;
_require((b >= 0 && c <= a) || (b < 0 && c > a), Errors.SUB_OVERFLOW);
return c;
}
/**
* @dev Returns the largest of two numbers of 256 bits.
*/
function max(uint256 a, uint256 b) internal pure returns (uint256 result) {
// Equivalent to:
// result = (a < b) ? b : a;
assembly {
result := sub(a, mul(sub(a, b), lt(a, b)))
}
}
/**
* @dev Returns the smallest of two numbers of 256 bits.
*/
function min(uint256 a, uint256 b) internal pure returns (uint256 result) {
// Equivalent to `result = (a < b) ? a : b`
assembly {
result := sub(a, mul(sub(a, b), gt(a, b)))
}
}
function mul(uint256 a, uint256 b) internal pure returns (uint256) {
uint256 c = a * b;
_require(a == 0 || c / a == b, Errors.MUL_OVERFLOW);
return c;
}
function div(
uint256 a,
uint256 b,
bool roundUp
) internal pure returns (uint256) {
return roundUp ? divUp(a, b) : divDown(a, b);
}
function divDown(uint256 a, uint256 b) internal pure returns (uint256) {
_require(b != 0, Errors.ZERO_DIVISION);
return a / b;
}
function divUp(uint256 a, uint256 b) internal pure returns (uint256 result) {
_require(b != 0, Errors.ZERO_DIVISION);
// Equivalent to:
// result = a == 0 ? 0 : 1 + (a - 1) / b;
assembly {
result := mul(iszero(iszero(a)), add(1, div(sub(a, 1), b)))
}
}
}// SPDX-License-Identifier: MIT
// Based on the Address library from OpenZeppelin Contracts, altered by removing the `isContract` checks on
// `functionCall` and `functionDelegateCall` in order to save gas, as the recipients are known to be contracts.
pragma solidity ^0.7.0;
import "@balancer-labs/v2-interfaces/contracts/solidity-utils/helpers/BalancerErrors.sol";
/**
* @dev Collection of functions related to the address type
*/
library Address {
/**
* @dev Returns true if `account` is a contract.
*
* [IMPORTANT]
* ====
* It is unsafe to assume that an address for which this function returns
* false is an externally-owned account (EOA) and not a contract.
*
* Among others, `isContract` will return false for the following
* types of addresses:
*
* - an externally-owned account
* - a contract in construction
* - an address where a contract will be created
* - an address where a contract lived, but was destroyed
* ====
*/
function isContract(address account) internal view returns (bool) {
// This method relies on extcodesize, which returns 0 for contracts in
// construction, since the code is only stored at the end of the
// constructor execution.
uint256 size;
// solhint-disable-next-line no-inline-assembly
assembly {
size := extcodesize(account)
}
return size > 0;
}
// solhint-disable max-line-length
/**
* @dev Replacement for Solidity's `transfer`: sends `amount` wei to
* `recipient`, forwarding all available gas and reverting on errors.
*
* https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
* of certain opcodes, possibly making contracts go over the 2300 gas limit
* imposed by `transfer`, making them unable to receive funds via
* `transfer`. {sendValue} removes this limitation.
*
* https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
*
* IMPORTANT: because control is transferred to `recipient`, care must be
* taken to not create reentrancy vulnerabilities. Consider using
* {ReentrancyGuard} or the
* https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
*/
function sendValue(address payable recipient, uint256 amount) internal {
_require(address(this).balance >= amount, Errors.ADDRESS_INSUFFICIENT_BALANCE);
// solhint-disable-next-line avoid-low-level-calls, avoid-call-value
(bool success, ) = recipient.call{ value: amount }("");
_require(success, Errors.ADDRESS_CANNOT_SEND_VALUE);
}
/**
* @dev Performs a Solidity function call using a low level `call`. A
* plain `call` is an unsafe replacement for a function call: use this
* function instead.
*
* If `target` reverts with a revert reason, it is bubbled up by this
* function (like regular Solidity function calls).
*
* Returns the raw returned data. To convert to the expected return value,
* use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
*
* Requirements:
*
* - calling `target` with `data` must not revert.
*
* _Available since v3.1._
*/
function functionCall(address target, bytes memory data) internal returns (bytes memory) {
// solhint-disable-next-line avoid-low-level-calls
(bool success, bytes memory returndata) = target.call(data);
return verifyCallResult(success, returndata);
}
// solhint-enable max-line-length
/**
* @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
* but passing some native ETH as msg.value to the call.
*
* _Available since v3.4._
*/
function functionCallWithValue(
address target,
bytes memory data,
uint256 value
) internal returns (bytes memory) {
// solhint-disable-next-line avoid-low-level-calls
(bool success, bytes memory returndata) = target.call{ value: value }(data);
return verifyCallResult(success, returndata);
}
/**
* @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
* but performing a delegate call.
*
* _Available since v3.4._
*/
function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {
// solhint-disable-next-line avoid-low-level-calls
(bool success, bytes memory returndata) = target.delegatecall(data);
return verifyCallResult(success, returndata);
}
/**
* @dev Tool to verify that a low level call was successful, and revert if it wasn't, either by bubbling up the
* revert reason or using the one provided.
*
* _Available since v4.3._
*/
function verifyCallResult(bool success, bytes memory returndata) internal pure returns (bytes memory) {
if (success) {
return returndata;
} else {
// Look for revert reason and bubble it up if present
if (returndata.length > 0) {
// The easiest way to bubble the revert reason is using memory via assembly
// solhint-disable-next-line no-inline-assembly
assembly {
let returndata_size := mload(returndata)
revert(add(32, returndata), returndata_size)
}
} else {
_revert(Errors.LOW_LEVEL_CALL_FAILED);
}
}
}
}// SPDX-License-Identifier: MIT
// Based on the ReentrancyGuard library from OpenZeppelin Contracts, altered to reduce bytecode size.
// Modifier code is inlined by the compiler, which causes its code to appear multiple times in the codebase. By using
// private functions, we achieve the same end result with slightly higher runtime gas costs, but reduced bytecode size.
pragma solidity ^0.7.0;
import "@balancer-labs/v2-interfaces/contracts/solidity-utils/helpers/BalancerErrors.sol";
/**
* @dev Contract module that helps prevent reentrant calls to a function.
*
* Inheriting from `ReentrancyGuard` will make the {nonReentrant} modifier
* available, which can be applied to functions to make sure there are no nested
* (reentrant) calls to them.
*
* Note that because there is a single `nonReentrant` guard, functions marked as
* `nonReentrant` may not call one another. This can be worked around by making
* those functions `private`, and then adding `external` `nonReentrant` entry
* points to them.
*
* TIP: If you would like to learn more about reentrancy and alternative ways
* to protect against it, check out our blog post
* https://blog.openzeppelin.com/reentrancy-after-istanbul/[Reentrancy After Istanbul].
*/
abstract contract ReentrancyGuard {
// Booleans are more expensive than uint256 or any type that takes up a full
// word because each write operation emits an extra SLOAD to first read the
// slot's contents, replace the bits taken up by the boolean, and then write
// back. This is the compiler's defense against contract upgrades and
// pointer aliasing, and it cannot be disabled.
// The values being non-zero value makes deployment a bit more expensive,
// but in exchange the refund on every call to nonReentrant will be lower in
// amount. Since refunds are capped to a percentage of the total
// transaction's gas, it is best to keep them low in cases like this one, to
// increase the likelihood of the full refund coming into effect.
uint256 private constant _NOT_ENTERED = 1;
uint256 private constant _ENTERED = 2;
uint256 private _status;
constructor() {
_status = _NOT_ENTERED;
}
/**
* @dev Prevents a contract from calling itself, directly or indirectly.
* Calling a `nonReentrant` function from another `nonReentrant`
* function is not supported. It is possible to prevent this from happening
* by making the `nonReentrant` function external, and make it call a
* `private` function that does the actual work.
*/
modifier nonReentrant() {
_enterNonReentrant();
_;
_exitNonReentrant();
}
function _enterNonReentrant() private {
// On the first call to nonReentrant, _status will be _NOT_ENTERED
_require(_status != _ENTERED, Errors.REENTRANCY);
// Any calls to nonReentrant after this point will fail
_status = _ENTERED;
}
function _exitNonReentrant() private {
// By storing the original value once again, a refund is triggered (see
// https://eips.ethereum.org/EIPS/eip-2200)
_status = _NOT_ENTERED;
}
}// SPDX-License-Identifier: MIT
// Based on the ReentrancyGuard library from OpenZeppelin Contracts, altered to reduce gas costs.
// The `safeTransfer` and `safeTransferFrom` functions assume that `token` is a contract (an account with code), and
// work differently from the OpenZeppelin version if it is not.
pragma solidity ^0.7.0;
import "@balancer-labs/v2-interfaces/contracts/solidity-utils/helpers/BalancerErrors.sol";
import "@balancer-labs/v2-interfaces/contracts/solidity-utils/openzeppelin/IERC20.sol";
/**
* @title SafeERC20
* @dev Wrappers around ERC20 operations that throw on failure (when the token
* contract returns false). Tokens that return no value (and instead revert or
* throw on failure) are also supported, non-reverting calls are assumed to be
* successful.
* To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract,
* which allows you to call the safe operations as `token.safeTransfer(...)`, etc.
*/
library SafeERC20 {
function safeApprove(
IERC20 token,
address to,
uint256 value
) internal {
// Some contracts need their allowance reduced to 0 before setting it to an arbitrary amount.
if (value != 0 && token.allowance(address(this), address(to)) != 0) {
_callOptionalReturn(address(token), abi.encodeWithSelector(token.approve.selector, to, 0));
}
_callOptionalReturn(address(token), abi.encodeWithSelector(token.approve.selector, to, value));
}
function safeTransfer(
IERC20 token,
address to,
uint256 value
) internal {
_callOptionalReturn(address(token), abi.encodeWithSelector(token.transfer.selector, to, value));
}
function safeTransferFrom(
IERC20 token,
address from,
address to,
uint256 value
) internal {
_callOptionalReturn(address(token), abi.encodeWithSelector(token.transferFrom.selector, from, to, value));
}
/**
* @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
* on the return value: the return value is optional (but if data is returned, it must not be false).
*
* WARNING: `token` is assumed to be a contract: calls to EOAs will *not* revert.
*/
function _callOptionalReturn(address token, bytes memory data) private {
// We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since
// we're implementing it ourselves.
// solhint-disable-next-line avoid-low-level-calls
(bool success, bytes memory returndata) = token.call(data);
// If the low-level call didn't succeed we return whatever was returned from it.
// solhint-disable-next-line no-inline-assembly
assembly {
if eq(success, 0) {
returndatacopy(0, 0, returndatasize())
revert(0, returndatasize())
}
}
// Finally we check the returndata size is either zero or true - note that this check will always pass for EOAs
_require(returndata.length == 0 || abi.decode(returndata, (bool)), Errors.SAFE_ERC20_CALL_FAILED);
}
}// SPDX-License-Identifier: GPL-3.0-or-later
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
pragma solidity ^0.7.0;
import "@balancer-labs/v2-interfaces/contracts/solidity-utils/openzeppelin/IERC20.sol";
import "@balancer-labs/v2-interfaces/contracts/solidity-utils/misc/IWETH.sol";
import "@balancer-labs/v2-interfaces/contracts/vault/IAsset.sol";
abstract contract AssetHelpers {
// solhint-disable-next-line var-name-mixedcase
IWETH private immutable _weth;
// Sentinel value used to indicate WETH with wrapping/unwrapping semantics. The zero address is a good choice for
// multiple reasons: it is cheap to pass as a calldata argument, it is a known invalid token and non-contract, and
// it is an address Pools cannot register as a token.
address private constant _ETH = address(0);
constructor(IWETH weth) {
_weth = weth;
}
// solhint-disable-next-line func-name-mixedcase
function _WETH() internal view returns (IWETH) {
return _weth;
}
/**
* @dev Returns true if `asset` is the sentinel value that represents ETH.
*/
function _isETH(IAsset asset) internal pure returns (bool) {
return address(asset) == _ETH;
}
/**
* @dev Translates `asset` into an equivalent IERC20 token address. If `asset` represents ETH, it will be translated
* to the WETH contract.
*/
function _translateToIERC20(IAsset asset) internal view returns (IERC20) {
return _isETH(asset) ? _WETH() : _asIERC20(asset);
}
/**
* @dev Same as `_translateToIERC20(IAsset)`, but for an entire array.
*/
function _translateToIERC20(IAsset[] memory assets) internal view returns (IERC20[] memory) {
IERC20[] memory tokens = new IERC20[](assets.length);
for (uint256 i = 0; i < assets.length; ++i) {
tokens[i] = _translateToIERC20(assets[i]);
}
return tokens;
}
/**
* @dev Interprets `asset` as an IERC20 token. This function should only be called on `asset` if `_isETH` previously
* returned false for it, that is, if `asset` is guaranteed not to be the ETH sentinel value.
*/
function _asIERC20(IAsset asset) internal pure returns (IERC20) {
return IERC20(address(asset));
}
}// SPDX-License-Identifier: GPL-3.0-or-later
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
pragma solidity ^0.7.0;
pragma experimental ABIEncoderV2;
import "@balancer-labs/v2-interfaces/contracts/standalone-utils/IBalancerRelayer.sol";
import "@balancer-labs/v2-solidity-utils/contracts/helpers/Version.sol";
import "@balancer-labs/v2-solidity-utils/contracts/openzeppelin/ReentrancyGuard.sol";
import "@balancer-labs/v2-solidity-utils/contracts/openzeppelin/Address.sol";
/**
* @title Balancer Relayer
* @notice Allows safe multicall execution of a relayer's functions
* @dev
* Relayers are composed of two contracts:
* - This contract, which acts as a single point of entry into the system through a multicall function.
* - A library contract, which defines the allowed behaviour of the relayer.
*
* The relayer entrypoint can then repeatedly delegatecall into the library's code to perform actions.
* We can then run combinations of the library contract's functions in the context of the relayer entrypoint,
* without having to expose all these functions on the entrypoint contract itself. The multicall function is
* then a single point of entry for all actions, so we can easily prevent reentrancy.
*
* This design gives much stronger reentrancy guarantees, as otherwise a malicious contract could reenter
* the relayer through another function (which must allow reentrancy for multicall logic), and that would
* potentially allow them to manipulate global state, resulting in loss of funds in some cases:
* e.g., sweeping any leftover ETH that should have been refunded to the user.
*
* NOTE: Only the entrypoint contract should be allowlisted by Balancer governance as a relayer, so that the
* Vault will reject calls from outside the context of the entrypoint: e.g., if a user mistakenly called directly
* into the library contract.
*/
contract BalancerRelayer is IBalancerRelayer, Version, ReentrancyGuard {
using Address for address payable;
using Address for address;
IVault private immutable _vault;
address private immutable _library;
address private immutable _queryLibrary;
/**
* @dev This contract is not meant to be deployed directly by an EOA, but rather during construction of a contract
* derived from `BaseRelayerLibrary`, which will provide its own address as the relayer's library.
*/
constructor(
IVault vault,
address libraryAddress,
address queryLibrary,
string memory version
) Version(version) {
_vault = vault;
_library = libraryAddress;
_queryLibrary = queryLibrary;
}
receive() external payable {
// Only accept ETH transfers from the Vault. This is expected to happen due to a swap/exit/withdrawal
// with ETH as an output, should the relayer be listed as the recipient. This may also happen when
// joining a pool, performing a swap, or if managing a user's balance uses less than the full ETH value
// provided. Any excess ETH will be refunded to this contract, and then forwarded to the original sender.
_require(msg.sender == address(_vault), Errors.ETH_TRANSFER);
}
function getVault() external view override returns (IVault) {
return _vault;
}
function getLibrary() external view override returns (address) {
return _library;
}
function getQueryLibrary() external view override returns (address) {
return _queryLibrary;
}
function multicall(bytes[] calldata data) external payable override nonReentrant returns (bytes[] memory results) {
uint256 numData = data.length;
results = new bytes[](numData);
for (uint256 i = 0; i < numData; i++) {
results[i] = _library.functionDelegateCall(data[i]);
}
_refundETH();
}
function vaultActionsQueryMulticall(bytes[] calldata data)
external
override
nonReentrant
returns (bytes[] memory results)
{
uint256 numData = data.length;
results = new bytes[](numData);
for (uint256 i = 0; i < numData; i++) {
results[i] = _queryLibrary.functionDelegateCall(data[i]);
}
}
function _refundETH() private {
uint256 remainingEth = address(this).balance;
if (remainingEth > 0) {
msg.sender.sendValue(remainingEth);
}
}
}// SPDX-License-Identifier: GPL-3.0-or-later
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
pragma solidity ^0.7.0;
pragma experimental ABIEncoderV2;
import "@balancer-labs/v2-interfaces/contracts/standalone-utils/IBalancerRelayer.sol";
import "@balancer-labs/v2-interfaces/contracts/vault/IVault.sol";
import "@balancer-labs/v2-solidity-utils/contracts/openzeppelin/SafeERC20.sol";
import "./IBaseRelayerLibrary.sol";
import "./BalancerRelayer.sol";
/**
* @title Base Relayer Library
* @notice Core functionality of a relayer. Allow users to use a signature to approve this contract
* to take further actions on their behalf.
* @dev
* Relayers are composed of two contracts:
* - A `BalancerRelayer` contract, which acts as a single point of entry into the system through a multicall function
* - A library contract such as this one, which defines the allowed behaviour of the relayer
* NOTE: Only the entrypoint contract should be allowlisted by Balancer governance as a relayer, so that the Vault
* will reject calls from outside the entrypoint context.
*
* This contract should neither be allowlisted as a relayer, nor called directly by the user.
* No guarantees can be made about fund safety when calling this contract in an improper manner.
*
* All functions that are meant to be called from the entrypoint via `multicall` must be payable so that they
* do not revert in a call involving ETH. This also applies to functions that do not alter the state and would be
* usually labeled as `view`.
*/
abstract contract BaseRelayerLibraryCommon is IBaseRelayerLibrary {
using Address for address;
using SafeERC20 for IERC20;
IVault private immutable _vault;
constructor(IVault vault) IBaseRelayerLibrary(vault.WETH()) {
_vault = vault;
}
function getVault() public view override returns (IVault) {
return _vault;
}
/**
* @notice Approves the Vault to use tokens held in the relayer
* @dev This is needed to avoid having to send intermediate tokens back to the user
*/
function approveVault(IERC20 token, uint256 amount) external payable override {
if (_isChainedReference(amount)) {
amount = _getChainedReferenceValue(amount);
}
// TODO: gas golf this a bit
token.safeApprove(address(getVault()), amount);
}
/**
* @notice Returns the amount referenced by chained reference `ref`.
* @dev It does not alter the reference (even if it's marked as temporary).
*
* This function does not alter the state in any way. It is not marked as view because it has to be `payable`
* in order to be used in a batch transaction.
*
* Use a static call to read the state off-chain.
*/
function peekChainedReferenceValue(uint256 ref) external payable override returns (uint256 value) {
(, value) = _peekChainedReferenceValue(ref);
}
function _pullToken(
address sender,
IERC20 token,
uint256 amount
) internal override {
if (amount == 0) return;
IERC20[] memory tokens = new IERC20[](1);
tokens[0] = token;
uint256[] memory amounts = new uint256[](1);
amounts[0] = amount;
_pullTokens(sender, tokens, amounts);
}
function _pullTokens(
address sender,
IERC20[] memory tokens,
uint256[] memory amounts
) internal override {
IVault.UserBalanceOp[] memory ops = new IVault.UserBalanceOp[](tokens.length);
for (uint256 i; i < tokens.length; i++) {
ops[i] = IVault.UserBalanceOp({
asset: IAsset(address(tokens[i])),
amount: amounts[i],
sender: sender,
recipient: payable(address(this)),
kind: IVault.UserBalanceOpKind.TRANSFER_EXTERNAL
});
}
getVault().manageUserBalance(ops);
}
/**
* @dev Returns true if `amount` is not actually an amount, but rather a chained reference.
*/
function _isChainedReference(uint256 amount) internal pure override returns (bool) {
// First 3 nibbles are enough to determine if it's a chained reference.
return
(amount & 0xfff0000000000000000000000000000000000000000000000000000000000000) ==
0xba10000000000000000000000000000000000000000000000000000000000000;
}
/**
* @dev Returns true if `ref` is temporary reference, i.e. to be deleted after reading it.
*/
function _isTemporaryChainedReference(uint256 amount) internal pure returns (bool) {
// First 3 nibbles determine if it's a chained reference.
// If the 4th nibble is 0 it is temporary; otherwise it is considered read-only.
// In practice, we shall use '0xba11' for read-only references.
return
(amount & 0xffff000000000000000000000000000000000000000000000000000000000000) ==
0xba10000000000000000000000000000000000000000000000000000000000000;
}
/**
* @dev Stores `value` as the amount referenced by chained reference `ref`.
*/
function _setChainedReferenceValue(uint256 ref, uint256 value) internal override {
bytes32 slot = _getStorageSlot(ref);
// Since we do manual calculation of storage slots, it is easier (and cheaper) to rely on internal assembly to
// access it.
// solhint-disable-next-line no-inline-assembly
assembly {
sstore(slot, value)
}
}
/**
* @dev Returns the amount referenced by chained reference `ref`.
* If the reference is temporary, it will be cleared after reading it, so they can each only be read once.
* If the reference is not temporary (i.e. read-only), it will not be cleared after reading it
* (see `_isTemporaryChainedReference` function).
*/
function _getChainedReferenceValue(uint256 ref) internal override returns (uint256) {
(bytes32 slot, uint256 value) = _peekChainedReferenceValue(ref);
if (_isTemporaryChainedReference(ref)) {
// solhint-disable-next-line no-inline-assembly
assembly {
sstore(slot, 0)
}
}
return value;
}
/**
* @dev Returns the storage slot for reference `ref` as well as the amount referenced by it.
* It does not alter the reference (even if it's marked as temporary).
*/
function _peekChainedReferenceValue(uint256 ref) private view returns (bytes32 slot, uint256 value) {
slot = _getStorageSlot(ref);
// Since we do manual calculation of storage slots, it is easier (and cheaper) to rely on internal assembly to
// access it.
// solhint-disable-next-line no-inline-assembly
assembly {
value := sload(slot)
}
}
// solhint-disable-next-line var-name-mixedcase
bytes32 private immutable _TEMP_STORAGE_SUFFIX = keccak256("balancer.base-relayer-library");
function _getStorageSlot(uint256 ref) private view returns (bytes32) {
// This replicates the mechanism Solidity uses to allocate storage slots for mappings, but using a hash as the
// mapping's storage slot, and subtracting 1 at the end. This should be more than enough to prevent collisions
// with other state variables this or derived contracts might use.
// See https://docs.soliditylang.org/en/v0.8.9/internals/layout_in_storage.html
return bytes32(uint256(keccak256(abi.encodePacked(_removeReferencePrefix(ref), _TEMP_STORAGE_SUFFIX))) - 1);
}
/**
* @dev Returns a reference without its prefix.
* Use this function to calculate the storage slot so that it's the same for temporary and read-only references.
*/
function _removeReferencePrefix(uint256 ref) private pure returns (uint256) {
return (ref & 0x0000ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff);
}
}// SPDX-License-Identifier: GPL-3.0-or-later
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
pragma solidity ^0.7.0;
pragma experimental ABIEncoderV2;
import "@balancer-labs/v2-interfaces/contracts/vault/IVault.sol";
import "@balancer-labs/v2-vault/contracts/AssetHelpers.sol";
import "@balancer-labs/v2-solidity-utils/contracts/openzeppelin/SafeERC20.sol";
/**
* @title IBaseRelayerLibrary
*/
abstract contract IBaseRelayerLibrary is AssetHelpers {
using SafeERC20 for IERC20;
constructor(IWETH weth) AssetHelpers(weth) {
// solhint-disable-previous-line no-empty-blocks
}
function getVault() public view virtual returns (IVault);
function approveVault(IERC20 token, uint256 amount) external payable virtual;
function peekChainedReferenceValue(uint256 ref) external payable virtual returns (uint256);
function _pullToken(
address sender,
IERC20 token,
uint256 amount
) internal virtual;
function _pullTokens(
address sender,
IERC20[] memory tokens,
uint256[] memory amounts
) internal virtual;
function _isChainedReference(uint256 amount) internal pure virtual returns (bool);
function _setChainedReferenceValue(uint256 ref, uint256 value) internal virtual;
function _getChainedReferenceValue(uint256 ref) internal virtual returns (uint256);
/**
* @dev This reuses `_resolveAmountAndPullToken` to adjust the `amount` in case it is a chained reference,
* then pull that amount of `token` to the relayer. Additionally, it approves the `spender` to enable
* wrapping operations. The spender is usually a token, but could also be another kind of contract (e.g.,
* a protocol or gauge).
*/
function _resolveAmountPullTokenAndApproveSpender(
IERC20 token,
address spender,
uint256 amount,
address sender
) internal returns (uint256 resolvedAmount) {
resolvedAmount = _resolveAmountAndPullToken(token, amount, sender);
token.safeApprove(spender, resolvedAmount);
}
/**
* @dev Extract the `amount` (if it is a chained reference), and pull that amount of `token` to
* this contract.
*/
function _resolveAmountAndPullToken(
IERC20 token,
uint256 amount,
address sender
) internal returns (uint256 resolvedAmount) {
resolvedAmount = _resolveAmount(amount);
// The wrap caller is the implicit sender of tokens, so if the goal is for the tokens
// to be sourced from outside the relayer, we must first pull them here.
if (sender != address(this)) {
require(sender == msg.sender, "Incorrect sender");
_pullToken(sender, token, resolvedAmount);
}
}
/**
* @dev Resolve an amount from a possible chained reference. This is internal, since some wrappers
* call it independently.
*/
function _resolveAmount(uint256 amount) internal returns (uint256) {
return _isChainedReference(amount) ? _getChainedReferenceValue(amount) : amount;
}
/**
* @dev Transfer the given `amount` of `token` to `recipient`, then call `_setChainedReference`
* with that amount, in case it needs to be encoded as an output reference.
*/
function _transferAndSetChainedReference(
IERC20 token,
address recipient,
uint256 amount,
uint256 outputReference
) internal {
if (recipient != address(this)) {
token.safeTransfer(recipient, amount);
}
_setChainedReference(outputReference, amount);
}
/**
* @dev Check for a chained output reference, and encode the given `amount` if necessary.
* This is internal, since some wrappers call it independently.
*/
function _setChainedReference(uint256 outputReference, uint256 amount) internal {
if (_isChainedReference(outputReference)) {
_setChainedReferenceValue(outputReference, amount);
}
}
}// SPDX-License-Identifier: GPL-3.0-or-later
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
pragma solidity ^0.7.0;
pragma experimental ABIEncoderV2;
import "@balancer-labs/v2-interfaces/contracts/vault/IVault.sol";
import "@balancer-labs/v2-interfaces/contracts/pool-weighted/WeightedPoolUserData.sol";
import "@balancer-labs/v2-interfaces/contracts/pool-stable/StablePoolUserData.sol";
import "@balancer-labs/v2-interfaces/contracts/pool-utils/BasePoolUserData.sol";
import "@balancer-labs/v2-solidity-utils/contracts/helpers/InputHelpers.sol";
import "@balancer-labs/v2-solidity-utils/contracts/helpers/VaultHelpers.sol";
import "@balancer-labs/v2-solidity-utils/contracts/math/Math.sol";
import "./IBaseRelayerLibrary.sol";
/**
* @title VaultActions
* @notice Allows users to call the core functions on the Balancer Vault (swaps/joins/exits/user balance management)
* @dev Since the relayer is not expected to hold user funds, we expect the user to be the recipient of any token
* transfers from the Vault.
*
* All functions must be payable so they can be called from a multicall involving ETH.
*
* Note that this is a base contract for VaultQueryActions. Any functions that should not be called in a query context
* (e.g., `manageUserBalance`), should be virtual here, and overridden to revert in VaultQueryActions.
*/
abstract contract VaultActions is IBaseRelayerLibrary {
using Math for uint256;
/**
* @dev In a relayer, "chaining" - passing values between otherwise independent operations in a multicall - is
* achieved by passing reference structures between operations. Each reference has an index, corresponding to
* an offset into the input or output array (e.g., 0 means the first element of the inputs or results), and
* a key (computed from a hash of the index and some text), which is interpreted as a storage slot. Note that
* the actual data of the reference is NOT stored in the reference structure, but rather at the storage slot
* given by the key.
*
* The relayer uses masking on the unused MSB bits of all incoming and outgoing values to identify which are
* references, and which are simply values that can be used directly. Incoming references are replaced with
* their values before being forwarded to the underlying function. Likewise, outputs of underlying functions
* that need to be chained are converted to references before being passed as inputs to the next function.
* See `BaseRelayerLibrary`.
*/
struct OutputReference {
uint256 index;
uint256 key;
}
function swap(
IVault.SingleSwap memory singleSwap,
IVault.FundManagement calldata funds,
uint256 limit,
uint256 deadline,
uint256 value,
uint256 outputReference
) external payable virtual returns (uint256 result) {
require(funds.sender == msg.sender || funds.sender == address(this), "Incorrect sender");
if (_isChainedReference(singleSwap.amount)) {
singleSwap.amount = _getChainedReferenceValue(singleSwap.amount);
}
result = getVault().swap{ value: value }(singleSwap, funds, limit, deadline);
if (_isChainedReference(outputReference)) {
_setChainedReferenceValue(outputReference, result);
}
}
function batchSwap(
IVault.SwapKind kind,
IVault.BatchSwapStep[] memory swaps,
IAsset[] calldata assets,
IVault.FundManagement calldata funds,
int256[] calldata limits,
uint256 deadline,
uint256 value,
OutputReference[] calldata outputReferences
) external payable virtual returns (int256[] memory results) {
require(funds.sender == msg.sender || funds.sender == address(this), "Incorrect sender");
for (uint256 i = 0; i < swaps.length; ++i) {
uint256 amount = swaps[i].amount;
if (_isChainedReference(amount)) {
swaps[i].amount = _getChainedReferenceValue(amount);
}
}
results = getVault().batchSwap{ value: value }(kind, swaps, assets, funds, limits, deadline);
for (uint256 i = 0; i < outputReferences.length; ++i) {
require(_isChainedReference(outputReferences[i].key), "invalid chained reference");
// Batch swap return values are signed, as they are Vault deltas (positive values correspond to assets sent
// to the Vault, and negative values are assets received from the Vault). To simplify the chained reference
// value model, we simply store the absolute value.
// This should be fine for most use cases, as the caller can reason about swap results via the `limits`
// parameter.
_setChainedReferenceValue(outputReferences[i].key, Math.abs(results[outputReferences[i].index]));
}
}
function manageUserBalance(
IVault.UserBalanceOp[] memory ops,
uint256 value,
OutputReference[] calldata outputReferences
) external payable virtual {
for (uint256 i = 0; i < ops.length; i++) {
require(ops[i].sender == msg.sender || ops[i].sender == address(this), "Incorrect sender");
uint256 amount = ops[i].amount;
if (_isChainedReference(amount)) {
ops[i].amount = _getChainedReferenceValue(amount);
}
}
getVault().manageUserBalance{ value: value }(ops);
// `manageUserBalance` does not return results, but there is no calculation of amounts as with swaps.
// We can just use the original amounts.
for (uint256 i = 0; i < outputReferences.length; ++i) {
require(_isChainedReference(outputReferences[i].key), "invalid chained reference");
_setChainedReferenceValue(outputReferences[i].key, ops[outputReferences[i].index].amount);
}
}
enum PoolKind { WEIGHTED, LEGACY_STABLE, COMPOSABLE_STABLE, COMPOSABLE_STABLE_V2 }
function joinPool(
bytes32 poolId,
PoolKind kind,
address sender,
address recipient,
IVault.JoinPoolRequest memory request,
uint256 value,
uint256 outputReference
) external payable virtual {
require(sender == msg.sender || sender == address(this), "Incorrect sender");
// The output of a join will be the Pool's token contract, typically known as BPT (Balancer Pool Tokens).
// Since the Vault is unaware of this (BPT tokens are minted directly to the recipient), we manually
// measure this balance increase: but only if an output reference is provided.
IERC20 bpt = IERC20(VaultHelpers.toPoolAddress(poolId));
uint256 maybeInitialRecipientBPT = _isChainedReference(outputReference) ? bpt.balanceOf(recipient) : 0;
request.userData = _doJoinPoolChainedReferenceReplacements(kind, request.userData);
getVault().joinPool{ value: value }(poolId, sender, recipient, request);
if (_isChainedReference(outputReference)) {
// In this context, `maybeInitialRecipientBPT` is guaranteed to have been initialized, so we can safely read
// from it. Note that we assume the recipient balance change has a positive sign (i.e. the recipient
// received BPT).
uint256 finalRecipientBPT = bpt.balanceOf(recipient);
_setChainedReferenceValue(outputReference, finalRecipientBPT.sub(maybeInitialRecipientBPT));
}
}
/**
* @dev Compute the final userData for a join, depending on the PoolKind, performing replacements for chained
* references as necessary.
*/
function _doJoinPoolChainedReferenceReplacements(PoolKind kind, bytes memory userData)
internal
returns (bytes memory)
{
if (kind == PoolKind.WEIGHTED) {
return _doWeightedJoinChainedReferenceReplacements(userData);
} else if (
kind == PoolKind.LEGACY_STABLE ||
kind == PoolKind.COMPOSABLE_STABLE ||
kind == PoolKind.COMPOSABLE_STABLE_V2
) {
return _doStableJoinChainedReferenceReplacements(userData);
} else {
revert("UNHANDLED_POOL_KIND");
}
}
function _doWeightedJoinChainedReferenceReplacements(bytes memory userData) private returns (bytes memory) {
WeightedPoolUserData.JoinKind kind = WeightedPoolUserData.joinKind(userData);
if (kind == WeightedPoolUserData.JoinKind.EXACT_TOKENS_IN_FOR_BPT_OUT) {
return _doWeightedExactTokensInForBPTOutReplacements(userData);
} else {
// All other join kinds are 'given out' (i.e the parameter is a BPT amount),
// so we don't do replacements for those.
return userData;
}
}
function _doWeightedExactTokensInForBPTOutReplacements(bytes memory userData) private returns (bytes memory) {
(uint256[] memory amountsIn, uint256 minBPTAmountOut) = WeightedPoolUserData.exactTokensInForBptOut(userData);
// Save gas by only re-encoding the data if we actually performed a replacement
return
_replacedAmounts(amountsIn)
? abi.encode(WeightedPoolUserData.JoinKind.EXACT_TOKENS_IN_FOR_BPT_OUT, amountsIn, minBPTAmountOut)
: userData;
}
function _doStableJoinChainedReferenceReplacements(bytes memory userData) private returns (bytes memory) {
// The only 'given in' join (in which the parameters are the amounts in) is EXACT_TOKENS_IN_FOR_BPT_OUT,
// so that is the only one where we do replacements. Luckily all versions of Stable Pool share the same
// enum value for it, so we can treat them all the same, and just use the latest version.
// Note that ComposableStablePool versions V2 and up support a proportional join kind, which some previous
// versions did not. While it is not rejected here, if passed to the Pool it will revert.
StablePoolUserData.JoinKind kind = StablePoolUserData.joinKind(userData);
if (kind == StablePoolUserData.JoinKind.EXACT_TOKENS_IN_FOR_BPT_OUT) {
return _doStableExactTokensInForBPTOutReplacements(userData);
} else {
// All other join kinds are 'given out' (i.e the parameter is a BPT amount),
// so we don't do replacements for those.
return userData;
}
}
function _doStableExactTokensInForBPTOutReplacements(bytes memory userData) private returns (bytes memory) {
(uint256[] memory amountsIn, uint256 minBPTAmountOut) = StablePoolUserData.exactTokensInForBptOut(userData);
// Save gas by only re-encoding the data if we actually performed a replacement
return
_replacedAmounts(amountsIn)
? abi.encode(StablePoolUserData.JoinKind.EXACT_TOKENS_IN_FOR_BPT_OUT, amountsIn, minBPTAmountOut)
: userData;
}
// Mutates amountsIn, and returns true if any replacements were made
function _replacedAmounts(uint256[] memory amountsIn) private returns (bool) {
bool madeReplacements = false;
for (uint256 i = 0; i < amountsIn.length; ++i) {
uint256 amount = amountsIn[i];
if (_isChainedReference(amount)) {
amountsIn[i] = _getChainedReferenceValue(amount);
madeReplacements = true;
}
}
return madeReplacements;
}
function exitPool(
bytes32 poolId,
PoolKind kind,
address sender,
address payable recipient,
IVault.ExitPoolRequest memory request,
OutputReference[] calldata outputReferences
) external payable virtual {
require(sender == msg.sender || sender == address(this), "Incorrect sender");
// To track the changes of internal balances, we need an array of token addresses.
// We save this here to avoid having to recalculate after the exit.
IERC20[] memory trackedTokens = new IERC20[](outputReferences.length);
// Query initial balances for all tokens, and record them as chained references
uint256[] memory initialRecipientBalances = new uint256[](outputReferences.length);
for (uint256 i = 0; i < outputReferences.length; i++) {
require(_isChainedReference(outputReferences[i].key), "invalid chained reference");
IAsset asset = request.assets[outputReferences[i].index];
if (request.toInternalBalance) {
trackedTokens[i] = _asIERC20(asset);
} else {
initialRecipientBalances[i] = _isETH(asset) ? recipient.balance : _asIERC20(asset).balanceOf(recipient);
}
}
if (request.toInternalBalance) {
initialRecipientBalances = getVault().getInternalBalance(recipient, trackedTokens);
}
// Exit the Pool
request.userData = _doExitPoolChainedReferenceReplacements(kind, request.userData);
getVault().exitPool(poolId, sender, recipient, request);
// Query final balances for all tokens of interest
uint256[] memory finalRecipientTokenBalances = new uint256[](outputReferences.length);
if (request.toInternalBalance) {
finalRecipientTokenBalances = getVault().getInternalBalance(recipient, trackedTokens);
} else {
for (uint256 i = 0; i < outputReferences.length; i++) {
IAsset asset = request.assets[outputReferences[i].index];
finalRecipientTokenBalances[i] = _isETH(asset)
? recipient.balance
: _asIERC20(asset).balanceOf(recipient);
}
}
// Calculate deltas and save as chained references
for (uint256 i = 0; i < outputReferences.length; i++) {
_setChainedReferenceValue(
outputReferences[i].key,
finalRecipientTokenBalances[i].sub(initialRecipientBalances[i])
);
}
}
/**
* @dev Compute the final userData for an exit, depending on the PoolKind, performing replacements for chained
* references as necessary.
*/
function _doExitPoolChainedReferenceReplacements(PoolKind kind, bytes memory userData)
internal
returns (bytes memory)
{
// Must check for the recovery mode ExitKind first, which is common to all pool types.
// If it is just a regular exit, pass it to the appropriate PoolKind handler for interpretation.
if (BasePoolUserData.isRecoveryModeExitKind(userData)) {
return _doRecoveryExitReplacements(userData);
} else if (kind == PoolKind.WEIGHTED) {
return _doWeightedExitChainedReferenceReplacements(userData);
} else {
if (kind == PoolKind.LEGACY_STABLE) {
return _doLegacyStableExitChainedReferenceReplacements(userData);
} else if (kind == PoolKind.COMPOSABLE_STABLE) {
return _doComposableStableExitChainedReferenceReplacements(userData);
} else if (kind == PoolKind.COMPOSABLE_STABLE_V2) {
return _doComposableStableV2ExitChainedReferenceReplacements(userData);
} else {
revert("UNHANDLED_POOL_KIND");
}
}
}
function _doWeightedExitChainedReferenceReplacements(bytes memory userData) private returns (bytes memory) {
WeightedPoolUserData.ExitKind kind = WeightedPoolUserData.exitKind(userData);
if (kind == WeightedPoolUserData.ExitKind.EXACT_BPT_IN_FOR_ONE_TOKEN_OUT) {
return _doWeightedExactBptInForOneTokenOutReplacements(userData);
} else if (kind == WeightedPoolUserData.ExitKind.EXACT_BPT_IN_FOR_TOKENS_OUT) {
return _doWeightedExactBptInForTokensOutReplacements(userData);
} else {
// All other exit kinds are 'given out' (i.e the parameter is a token amount),
// so we don't do replacements for those.
return userData;
}
}
function _doWeightedExactBptInForOneTokenOutReplacements(bytes memory userData) private returns (bytes memory) {
(uint256 bptAmountIn, uint256 tokenIndex) = WeightedPoolUserData.exactBptInForTokenOut(userData);
if (_isChainedReference(bptAmountIn)) {
bptAmountIn = _getChainedReferenceValue(bptAmountIn);
return abi.encode(WeightedPoolUserData.ExitKind.EXACT_BPT_IN_FOR_ONE_TOKEN_OUT, bptAmountIn, tokenIndex);
} else {
// Save gas by only re-encoding the data if we actually performed a replacement
return userData;
}
}
function _doWeightedExactBptInForTokensOutReplacements(bytes memory userData) private returns (bytes memory) {
uint256 bptAmountIn = WeightedPoolUserData.exactBptInForTokensOut(userData);
if (_isChainedReference(bptAmountIn)) {
bptAmountIn = _getChainedReferenceValue(bptAmountIn);
return abi.encode(WeightedPoolUserData.ExitKind.EXACT_BPT_IN_FOR_TOKENS_OUT, bptAmountIn);
} else {
// Save gas by only re-encoding the data if we actually performed a replacement
return userData;
}
}
function _doRecoveryExitReplacements(bytes memory userData) private returns (bytes memory) {
uint256 bptAmountIn = BasePoolUserData.recoveryModeExit(userData);
if (_isChainedReference(bptAmountIn)) {
bptAmountIn = _getChainedReferenceValue(bptAmountIn);
return abi.encode(BasePoolUserData.RECOVERY_MODE_EXIT_KIND, bptAmountIn);
} else {
// Save gas by only re-encoding the data if we actually performed a replacement
return userData;
}
}
// Stable Pool version-dependent recoding dispatch functions
/*
* While all Stable Pool versions fortuitously support the same join kinds (V2 and higher support one extra),
* they do NOT all support the same exit kinds. Also, though the encoding of the data associated with the exit
* is uniform across pool kinds for the same exit method, the ExitKind ID itself may have a different value.
*
* For instance, BPT_IN_FOR_EXACT_TOKENS_OUT is 2 in legacy Stable Pools, but 1 in Composable Stable Pools.
* (See the reference comment and libraries below.)
*
* Accordingly, the three do[PoolKind]ExitChainedReferenceReplacements functions below (for LegacyStable,
* ComposableStable, and CopmosableStableV2) extract the exitKind and pass it through to the shared
* recoding functions.
*/
function _doLegacyStableExitChainedReferenceReplacements(bytes memory userData) private returns (bytes memory) {
uint8 exitKind = uint8(StablePoolUserData.exitKind(userData));
if (exitKind == uint8(LegacyStablePoolUserData.ExitKind.EXACT_BPT_IN_FOR_ONE_TOKEN_OUT)) {
return _doStableExactBptInForOneTokenOutReplacements(userData, exitKind);
} else if (exitKind == uint8(LegacyStablePoolUserData.ExitKind.EXACT_BPT_IN_FOR_TOKENS_OUT)) {
return _doStableExactBptInForTokensOutReplacements(userData, exitKind);
} else {
// All other exit kinds are 'given out' (i.e the parameter is a token amount),
// so we don't do replacements for those.
return userData;
}
}
// For the first deployment of ComposableStablePool
function _doComposableStableExitChainedReferenceReplacements(bytes memory userData) private returns (bytes memory) {
uint8 exitKind = uint8(StablePoolUserData.exitKind(userData));
if (exitKind == uint8(ComposableStablePoolUserData.ExitKind.EXACT_BPT_IN_FOR_ONE_TOKEN_OUT)) {
return _doStableExactBptInForOneTokenOutReplacements(userData, exitKind);
} else {
// All other exit kinds are 'given out' (i.e the parameter is a token amount),
// so we don't do replacements for those.
return userData;
}
}
// For ComposableStablePool V2 and V3
function _doComposableStableV2ExitChainedReferenceReplacements(bytes memory userData)
private
returns (bytes memory)
{
uint8 exitKind = uint8(StablePoolUserData.exitKind(userData));
if (exitKind == uint8(StablePoolUserData.ExitKind.EXACT_BPT_IN_FOR_ONE_TOKEN_OUT)) {
return _doStableExactBptInForOneTokenOutReplacements(userData, exitKind);
} else if (exitKind == uint8(StablePoolUserData.ExitKind.EXACT_BPT_IN_FOR_ALL_TOKENS_OUT)) {
return _doStableExactBptInForTokensOutReplacements(userData, exitKind);
} else {
// All other exit kinds are 'given out' (i.e the parameter is a token amount),
// so we don't do replacements for those.
return userData;
}
}
// Shared Stable Exit recoding functions
// The following two functions perform the actual recoding, which involves parsing and re-encoding the userData.
// The encoding of the actual arguments is uniform across pool kinds, which allows these recoding functions to be
// shared. However, the ExitKind ID itself can vary, so it must be passed in from each specific pool kind handler.
function _doStableExactBptInForOneTokenOutReplacements(bytes memory userData, uint8 exitKind)
private
returns (bytes memory)
{
(uint256 bptAmountIn, uint256 tokenIndex) = StablePoolUserData.exactBptInForTokenOut(userData);
if (_isChainedReference(bptAmountIn)) {
bptAmountIn = _getChainedReferenceValue(bptAmountIn);
return abi.encode(exitKind, bptAmountIn, tokenIndex);
} else {
// Save gas by only re-encoding the data if we actually performed a replacement
return userData;
}
}
function _doStableExactBptInForTokensOutReplacements(bytes memory userData, uint8 exitKind)
private
returns (bytes memory)
{
uint256 bptAmountIn = StablePoolUserData.exactBptInForTokensOut(userData);
if (_isChainedReference(bptAmountIn)) {
bptAmountIn = _getChainedReferenceValue(bptAmountIn);
return abi.encode(exitKind, bptAmountIn);
} else {
// Save gas by only re-encoding the data if we actually performed a replacement
return userData;
}
}
}
/*
For reference:
StablePoolUserData (applies to ComposableStablePool V2+):
enum JoinKind { INIT, EXACT_TOKENS_IN_FOR_BPT_OUT, TOKEN_IN_FOR_EXACT_BPT_OUT, ALL_TOKENS_IN_FOR_EXACT_BPT_OUT }
enum ExitKind { EXACT_BPT_IN_FOR_ONE_TOKEN_OUT, BPT_IN_FOR_EXACT_TOKENS_OUT, EXACT_BPT_IN_FOR_ALL_TOKENS_OUT }
WeightedPoolUserData:
enum JoinKind { INIT, EXACT_TOKENS_IN_FOR_BPT_OUT, TOKEN_IN_FOR_EXACT_BPT_OUT, ALL_TOKENS_IN_FOR_EXACT_BPT_OUT }
enum ExitKind { EXACT_BPT_IN_FOR_ONE_TOKEN_OUT, EXACT_BPT_IN_FOR_TOKENS_OUT, BPT_IN_FOR_EXACT_TOKENS_OUT }
StablePhantomPools can only be exited proportionally when the pool is paused: and the pause window has expired.
They have their own enum:
enum ExitKindPhantom { EXACT_BPT_IN_FOR_TOKENS_OUT }
*/
// Applies to StablePool, MetaStablePool, StablePool V2
library LegacyStablePoolUserData {
enum JoinKind { INIT, EXACT_TOKENS_IN_FOR_BPT_OUT, TOKEN_IN_FOR_EXACT_BPT_OUT }
enum ExitKind { EXACT_BPT_IN_FOR_ONE_TOKEN_OUT, EXACT_BPT_IN_FOR_TOKENS_OUT, BPT_IN_FOR_EXACT_TOKENS_OUT }
}
// Applies to the first deployment of ComposableStablePool (pre-Versioning)
library ComposableStablePoolUserData {
enum JoinKind { INIT, EXACT_TOKENS_IN_FOR_BPT_OUT, TOKEN_IN_FOR_EXACT_BPT_OUT }
enum ExitKind { EXACT_BPT_IN_FOR_ONE_TOKEN_OUT, BPT_IN_FOR_EXACT_TOKENS_OUT }
}// SPDX-License-Identifier: GPL-3.0-or-later
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
pragma solidity ^0.7.0;
pragma experimental ABIEncoderV2;
import "@balancer-labs/v2-interfaces/contracts/vault/IBasePool.sol";
import "@balancer-labs/v2-solidity-utils/contracts/helpers/InputHelpers.sol";
import "./VaultActions.sol";
/**
* @title VaultQueryActions
* @notice Allows users to simulate the core functions on the Balancer Vault (swaps/joins/exits), using queries instead
* of the actual operations.
* @dev Inherits from VaultActions to maximize reuse - but also pulls in `manageUserBalance`. This might not hurt
* anything, but isn't intended behavior in a query context, so we override and disable it. Anything else added to the
* base contract that isn't query-friendly should likewise be disabled.
*/
abstract contract VaultQueryActions is VaultActions {
function swap(
IVault.SingleSwap memory singleSwap,
IVault.FundManagement calldata funds,
uint256 limit,
uint256, // deadline
uint256, // value
uint256 outputReference
) external payable override returns (uint256 result) {
require(funds.sender == msg.sender || funds.sender == address(this), "Incorrect sender");
if (_isChainedReference(singleSwap.amount)) {
singleSwap.amount = _getChainedReferenceValue(singleSwap.amount);
}
result = _querySwap(singleSwap, funds);
_require(singleSwap.kind == IVault.SwapKind.GIVEN_IN ? result >= limit : result <= limit, Errors.SWAP_LIMIT);
if (_isChainedReference(outputReference)) {
_setChainedReferenceValue(outputReference, result);
}
}
function _querySwap(IVault.SingleSwap memory singleSwap, IVault.FundManagement memory funds)
private
returns (uint256)
{
// The Vault only supports batch swap queries, so we need to convert the swap call into an equivalent batch
// swap. The result will be identical.
// The main difference between swaps and batch swaps is that batch swaps require an assets array. We're going
// to place the asset in at index 0, and asset out at index 1.
IAsset[] memory assets = new IAsset[](2);
assets[0] = singleSwap.assetIn;
assets[1] = singleSwap.assetOut;
IVault.BatchSwapStep[] memory swaps = new IVault.BatchSwapStep[](1);
swaps[0] = IVault.BatchSwapStep({
poolId: singleSwap.poolId,
assetInIndex: 0,
assetOutIndex: 1,
amount: singleSwap.amount,
userData: singleSwap.userData
});
int256[] memory assetDeltas = getVault().queryBatchSwap(singleSwap.kind, swaps, assets, funds);
// Batch swaps return the full Vault asset deltas, which in the special case of a single step swap contains more
// information than we need (as the amount in is known in a GIVEN_IN swap, and the amount out is known in a
// GIVEN_OUT swap). We extract the information we're interested in.
if (singleSwap.kind == IVault.SwapKind.GIVEN_IN) {
// The asset out will have a negative Vault delta (the assets are coming out of the Pool and the user is
// receiving them), so make it positive to match the `swap` interface.
_require(assetDeltas[1] <= 0, Errors.SHOULD_NOT_HAPPEN);
return uint256(-assetDeltas[1]);
} else {
// The asset in will have a positive Vault delta (the assets are going into the Pool and the user is
// sending them), so we don't need to do anything.
return uint256(assetDeltas[0]);
}
}
function batchSwap(
IVault.SwapKind kind,
IVault.BatchSwapStep[] memory swaps,
IAsset[] calldata assets,
IVault.FundManagement calldata funds,
int256[] calldata limits,
uint256, // deadline
uint256, // value
OutputReference[] calldata outputReferences
) external payable override returns (int256[] memory results) {
require(funds.sender == msg.sender || funds.sender == address(this), "Incorrect sender");
for (uint256 i = 0; i < swaps.length; ++i) {
uint256 amount = swaps[i].amount;
if (_isChainedReference(amount)) {
swaps[i].amount = _getChainedReferenceValue(amount);
}
}
results = getVault().queryBatchSwap(kind, swaps, assets, funds);
for (uint256 i = 0; i < outputReferences.length; ++i) {
require(_isChainedReference(outputReferences[i].key), "invalid chained reference");
_require(results[i] <= limits[i], Errors.SWAP_LIMIT);
// Batch swap return values are signed, as they are Vault deltas (positive values correspond to assets sent
// to the Vault, and negative values are assets received from the Vault). To simplify the chained reference
// value model, we simply store the absolute value.
// This should be fine for most use cases, as the caller can reason about swap results via the `limits`
// parameter.
_setChainedReferenceValue(outputReferences[i].key, Math.abs(results[outputReferences[i].index]));
}
}
function joinPool(
bytes32 poolId,
PoolKind kind,
address sender,
address recipient,
IVault.JoinPoolRequest memory request,
uint256, // value
uint256 outputReference
) external payable override {
require(sender == msg.sender || sender == address(this), "Incorrect sender");
request.userData = _doJoinPoolChainedReferenceReplacements(kind, request.userData);
uint256 bptOut = _queryJoin(poolId, sender, recipient, request);
if (_isChainedReference(outputReference)) {
_setChainedReferenceValue(outputReference, bptOut);
}
}
function _queryJoin(
bytes32 poolId,
address sender,
address recipient,
IVault.JoinPoolRequest memory request
) private returns (uint256 bptOut) {
(address pool, ) = getVault().getPool(poolId);
(uint256[] memory balances, uint256 lastChangeBlock) = _validateAssetsAndGetBalances(poolId, request.assets);
IProtocolFeesCollector feesCollector = getVault().getProtocolFeesCollector();
(bptOut, ) = IBasePool(pool).queryJoin(
poolId,
sender,
recipient,
balances,
lastChangeBlock,
feesCollector.getSwapFeePercentage(),
request.userData
);
}
function exitPool(
bytes32 poolId,
PoolKind kind,
address sender,
address payable recipient,
IVault.ExitPoolRequest memory request,
OutputReference[] calldata outputReferences
) external payable override {
require(sender == msg.sender || sender == address(this), "Incorrect sender");
// Exit the Pool
request.userData = _doExitPoolChainedReferenceReplacements(kind, request.userData);
uint256[] memory amountsOut = _queryExit(poolId, sender, recipient, request);
// Save as chained references
for (uint256 i = 0; i < outputReferences.length; i++) {
_setChainedReferenceValue(outputReferences[i].key, amountsOut[outputReferences[i].index]);
}
}
function _queryExit(
bytes32 poolId,
address sender,
address recipient,
IVault.ExitPoolRequest memory request
) private returns (uint256[] memory amountsOut) {
(address pool, ) = getVault().getPool(poolId);
(uint256[] memory balances, uint256 lastChangeBlock) = _validateAssetsAndGetBalances(poolId, request.assets);
IProtocolFeesCollector feesCollector = getVault().getProtocolFeesCollector();
(, amountsOut) = IBasePool(pool).queryExit(
poolId,
sender,
recipient,
balances,
lastChangeBlock,
feesCollector.getSwapFeePercentage(),
request.userData
);
}
function _validateAssetsAndGetBalances(bytes32 poolId, IAsset[] memory expectedAssets)
private
view
returns (uint256[] memory balances, uint256 lastChangeBlock)
{
IERC20[] memory actualTokens;
IERC20[] memory expectedTokens = _translateToIERC20(expectedAssets);
(actualTokens, balances, lastChangeBlock) = getVault().getPoolTokens(poolId);
InputHelpers.ensureInputLengthMatch(actualTokens.length, expectedTokens.length);
for (uint256 i = 0; i < actualTokens.length; ++i) {
IERC20 token = actualTokens[i];
_require(token == expectedTokens[i], Errors.TOKENS_MISMATCH);
}
}
/// @dev Prevent `vaultActionsQueryMulticall` from calling manageUserBalance.
function manageUserBalance(
IVault.UserBalanceOp[] memory,
uint256,
OutputReference[] calldata
) external payable override {
_revert(Errors.UNIMPLEMENTED);
}
}{
"optimizer": {
"enabled": true,
"runs": 9999
},
"outputSelection": {
"*": {
"*": [
"evm.bytecode",
"evm.deployedBytecode",
"devdoc",
"userdoc",
"metadata",
"abi"
]
}
},
"libraries": {}
}Contract Security Audit
- No Contract Security Audit Submitted- Submit Audit Here
[{"inputs":[{"internalType":"contract IVault","name":"vault","type":"address"}],"stateMutability":"nonpayable","type":"constructor"},{"inputs":[{"internalType":"contract IERC20","name":"token","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"approveVault","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"enum IVault.SwapKind","name":"kind","type":"uint8"},{"components":[{"internalType":"bytes32","name":"poolId","type":"bytes32"},{"internalType":"uint256","name":"assetInIndex","type":"uint256"},{"internalType":"uint256","name":"assetOutIndex","type":"uint256"},{"internalType":"uint256","name":"amount","type":"uint256"},{"internalType":"bytes","name":"userData","type":"bytes"}],"internalType":"struct IVault.BatchSwapStep[]","name":"swaps","type":"tuple[]"},{"internalType":"contract IAsset[]","name":"assets","type":"address[]"},{"components":[{"internalType":"address","name":"sender","type":"address"},{"internalType":"bool","name":"fromInternalBalance","type":"bool"},{"internalType":"address payable","name":"recipient","type":"address"},{"internalType":"bool","name":"toInternalBalance","type":"bool"}],"internalType":"struct IVault.FundManagement","name":"funds","type":"tuple"},{"internalType":"int256[]","name":"limits","type":"int256[]"},{"internalType":"uint256","name":"","type":"uint256"},{"internalType":"uint256","name":"","type":"uint256"},{"components":[{"internalType":"uint256","name":"index","type":"uint256"},{"internalType":"uint256","name":"key","type":"uint256"}],"internalType":"struct VaultActions.OutputReference[]","name":"outputReferences","type":"tuple[]"}],"name":"batchSwap","outputs":[{"internalType":"int256[]","name":"results","type":"int256[]"}],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"bytes32","name":"poolId","type":"bytes32"},{"internalType":"enum VaultActions.PoolKind","name":"kind","type":"uint8"},{"internalType":"address","name":"sender","type":"address"},{"internalType":"address payable","name":"recipient","type":"address"},{"components":[{"internalType":"contract IAsset[]","name":"assets","type":"address[]"},{"internalType":"uint256[]","name":"minAmountsOut","type":"uint256[]"},{"internalType":"bytes","name":"userData","type":"bytes"},{"internalType":"bool","name":"toInternalBalance","type":"bool"}],"internalType":"struct IVault.ExitPoolRequest","name":"request","type":"tuple"},{"components":[{"internalType":"uint256","name":"index","type":"uint256"},{"internalType":"uint256","name":"key","type":"uint256"}],"internalType":"struct VaultActions.OutputReference[]","name":"outputReferences","type":"tuple[]"}],"name":"exitPool","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[],"name":"getVault","outputs":[{"internalType":"contract IVault","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"bytes32","name":"poolId","type":"bytes32"},{"internalType":"enum VaultActions.PoolKind","name":"kind","type":"uint8"},{"internalType":"address","name":"sender","type":"address"},{"internalType":"address","name":"recipient","type":"address"},{"components":[{"internalType":"contract IAsset[]","name":"assets","type":"address[]"},{"internalType":"uint256[]","name":"maxAmountsIn","type":"uint256[]"},{"internalType":"bytes","name":"userData","type":"bytes"},{"internalType":"bool","name":"fromInternalBalance","type":"bool"}],"internalType":"struct IVault.JoinPoolRequest","name":"request","type":"tuple"},{"internalType":"uint256","name":"","type":"uint256"},{"internalType":"uint256","name":"outputReference","type":"uint256"}],"name":"joinPool","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[{"components":[{"internalType":"enum IVault.UserBalanceOpKind","name":"kind","type":"uint8"},{"internalType":"contract IAsset","name":"asset","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"},{"internalType":"address","name":"sender","type":"address"},{"internalType":"address payable","name":"recipient","type":"address"}],"internalType":"struct IVault.UserBalanceOp[]","name":"","type":"tuple[]"},{"internalType":"uint256","name":"","type":"uint256"},{"components":[{"internalType":"uint256","name":"index","type":"uint256"},{"internalType":"uint256","name":"key","type":"uint256"}],"internalType":"struct VaultActions.OutputReference[]","name":"","type":"tuple[]"}],"name":"manageUserBalance","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"uint256","name":"ref","type":"uint256"}],"name":"peekChainedReferenceValue","outputs":[{"internalType":"uint256","name":"value","type":"uint256"}],"stateMutability":"payable","type":"function"},{"inputs":[{"components":[{"internalType":"bytes32","name":"poolId","type":"bytes32"},{"internalType":"enum IVault.SwapKind","name":"kind","type":"uint8"},{"internalType":"contract IAsset","name":"assetIn","type":"address"},{"internalType":"contract IAsset","name":"assetOut","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"},{"internalType":"bytes","name":"userData","type":"bytes"}],"internalType":"struct IVault.SingleSwap","name":"singleSwap","type":"tuple"},{"components":[{"internalType":"address","name":"sender","type":"address"},{"internalType":"bool","name":"fromInternalBalance","type":"bool"},{"internalType":"address payable","name":"recipient","type":"address"},{"internalType":"bool","name":"toInternalBalance","type":"bool"}],"internalType":"struct IVault.FundManagement","name":"funds","type":"tuple"},{"internalType":"uint256","name":"limit","type":"uint256"},{"internalType":"uint256","name":"","type":"uint256"},{"internalType":"uint256","name":"","type":"uint256"},{"internalType":"uint256","name":"outputReference","type":"uint256"}],"name":"swap","outputs":[{"internalType":"uint256","name":"result","type":"uint256"}],"stateMutability":"payable","type":"function"}]Contract Creation Code
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Constructor Arguments (ABI-Encoded and is the last bytes of the Contract Creation Code above)
000000000000000000000000ba12222222228d8ba445958a75a0704d566bf2c8
-----Decoded View---------------
Arg [0] : vault (address): 0xBA12222222228d8Ba445958a75a0704d566BF2C8
-----Encoded View---------------
1 Constructor Arguments found :
Arg [0] : 000000000000000000000000ba12222222228d8ba445958a75a0704d566bf2c8
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Multichain Portfolio | 30 Chains
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A contract address hosts a smart contract, which is a set of code stored on the blockchain that runs when predetermined conditions are met. Learn more about addresses in our Knowledge Base.