63 lines
2.5 KiB
Solidity
63 lines
2.5 KiB
Solidity
// SPDX-License-Identifier: GPL-3.0-or-later
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// You should have received a copy of the GNU General Public License
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// along with this program. If not, see <http://www.gnu.org/licenses/>.
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pragma solidity >=0.7.0 <0.9.0;
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pragma experimental ABIEncoderV2;
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import "../vault/IVault.sol";
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/**
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* @dev Provides a way to perform queries on swaps, joins and exits, simulating these operations and returning the exact
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* result they would have if called on the Vault given the current state. Note that the results will be affected by
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* other transactions interacting with the Pools involved.
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*
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* All query functions can be called both on-chain and off-chain.
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*
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* If calling them from a contract, note that all query functions are not `view`. Despite this, these functions produce
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* no net state change, and for all intents and purposes can be thought of as if they were indeed `view`. However,
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* calling them via STATICCALL will fail.
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*
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* If calling them from an off-chain client, make sure to use eth_call: most clients default to eth_sendTransaction for
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* non-view functions.
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*
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* In all cases, the `fromInternalBalance` and `toInternalBalance` fields are entirely ignored: we just use the same
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* structs for simplicity.
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*/
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interface IBalancerQueries {
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function querySwap(IVault.SingleSwap memory singleSwap, IVault.FundManagement memory funds)
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external
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returns (uint256);
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function queryBatchSwap(
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IVault.SwapKind kind,
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IVault.BatchSwapStep[] memory swaps,
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IAsset[] memory assets,
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IVault.FundManagement memory funds
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) external returns (int256[] memory assetDeltas);
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function queryJoin(
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bytes32 poolId,
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address sender,
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address recipient,
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IVault.JoinPoolRequest memory request
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) external returns (uint256 bptOut, uint256[] memory amountsIn);
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function queryExit(
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bytes32 poolId,
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address sender,
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address recipient,
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IVault.ExitPoolRequest memory request
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) external returns (uint256 bptIn, uint256[] memory amountsOut);
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}
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