Pool to support rebasing mint call #1490
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| Original file line number | Diff line number | Diff line change |
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| // SPDX-License-Identifier: BUSL-1.1 | ||
| pragma solidity 0.8.24; | ||
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| import {IBurnMintERC20} from "../../shared/token/ERC20/IBurnMintERC20.sol"; | ||
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| import {Pool} from "../libraries/Pool.sol"; | ||
| import {BurnWithFromMintTokenPool} from "./BurnWithFromMintTokenPool.sol"; | ||
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| /// @notice This pool mints and burns a 3rd-party token. | ||
| /// @dev This contract is a variant of BurnMintTokenPool that uses `burn(from, amount)`. | ||
| /// @dev This contract supports minting tokens that do not mint the exact amount they are asked to mint. This can be | ||
| /// used for rebasing tokens. NOTE: for true rebasing support, the lockOrBurn method must also be updated to support | ||
| /// relaying the correct amount. | ||
| contract BurnWithFromMintRebasingTokenPool is BurnWithFromMintTokenPool { | ||
| error NegativeMintAmount(uint256 amountBurned); | ||
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| string public constant override typeAndVersion = "BurnWithFromMintRebasingTokenPool 1.5.0"; | ||
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| constructor( | ||
| IBurnMintERC20 token, | ||
| address[] memory allowlist, | ||
| address rmnProxy, | ||
| address router | ||
| ) BurnWithFromMintTokenPool(token, allowlist, rmnProxy, router) {} | ||
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| /// @notice Mint tokens from the pool to the recipient | ||
| /// @dev The _validateReleaseOrMint check is an essential security check | ||
| function releaseOrMint( | ||
| Pool.ReleaseOrMintInV1 calldata releaseOrMintIn | ||
| ) external virtual override returns (Pool.ReleaseOrMintOutV1 memory) { | ||
| _validateReleaseOrMint(releaseOrMintIn); | ||
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| uint256 balancePre = IBurnMintERC20(address(i_token)).balanceOf(releaseOrMintIn.receiver); | ||
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| // Mint to the receiver | ||
| IBurnMintERC20(address(i_token)).mint(releaseOrMintIn.receiver, releaseOrMintIn.amount); | ||
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| uint256 balancePost = IBurnMintERC20(address(i_token)).balanceOf(releaseOrMintIn.receiver); | ||
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| // Mint should not reduce the number of tokens in the receiver, if it does it will revert the call. | ||
| if (balancePost < balancePre) { | ||
| revert NegativeMintAmount(balancePre - balancePost); | ||
| } | ||
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| emit Minted(msg.sender, releaseOrMintIn.receiver, balancePost - balancePre); | ||
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| return Pool.ReleaseOrMintOutV1({destinationAmount: balancePost - balancePre}); | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,27 @@ | ||
| // SPDX-License-Identifier: BUSL-1.1 | ||
| pragma solidity 0.8.24; | ||
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| import {ERC20} from "../../../vendor/openzeppelin-solidity/v4.8.3/contracts/token/ERC20/ERC20.sol"; | ||
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| contract ERC20RebasingHelper is ERC20 { | ||
| uint16 public s_multiplierPercentage = 100; | ||
| bool public s_mintShouldBurn = false; | ||
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| constructor() ERC20("Rebasing", "REB") {} | ||
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| function mint(address to, uint256 amount) external { | ||
| if (!s_mintShouldBurn) { | ||
| _mint(to, amount * s_multiplierPercentage / 100); | ||
| return; | ||
| } | ||
| _burn(to, amount * s_multiplierPercentage / 100); | ||
| } | ||
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| function setMultiplierPercentage(uint16 multiplierPercentage) external { | ||
| s_multiplierPercentage = multiplierPercentage; | ||
| } | ||
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| function setMintShouldBurn(bool mintShouldBurn) external { | ||
| s_mintShouldBurn = mintShouldBurn; | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,87 @@ | ||
| // SPDX-License-Identifier: BUSL-1.1 | ||
| pragma solidity 0.8.24; | ||
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| import {IBurnMintERC20} from "../../../shared/token/ERC20/IBurnMintERC20.sol"; | ||
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| import {Pool} from "../../libraries/Pool.sol"; | ||
| import {BurnWithFromMintRebasingTokenPool} from "../../pools/BurnWithFromMintRebasingTokenPool.sol"; | ||
| import {BurnMintSetup} from "./BurnMintSetup.t.sol"; | ||
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| import {IERC20} from "../../../vendor/openzeppelin-solidity/v4.8.3/contracts/token/ERC20/IERC20.sol"; | ||
| import {ERC20RebasingHelper} from "../helpers/ERC20RebasingHelper.sol"; | ||
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| contract BurnWithFromMintRebasingTokenPoolSetup is BurnMintSetup { | ||
| BurnWithFromMintRebasingTokenPool internal s_pool; | ||
| ERC20RebasingHelper internal s_rebasingToken; | ||
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| function setUp() public virtual override { | ||
| BurnMintSetup.setUp(); | ||
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| s_rebasingToken = new ERC20RebasingHelper(); | ||
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| s_pool = new BurnWithFromMintRebasingTokenPool( | ||
| IBurnMintERC20(address(s_rebasingToken)), new address[](0), address(s_mockRMN), address(s_sourceRouter) | ||
| ); | ||
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| _applyChainUpdates(address(s_pool)); | ||
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| deal(address(s_rebasingToken), OWNER, 1e18); | ||
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| vm.startPrank(s_burnMintOffRamp); | ||
| } | ||
| } | ||
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| contract BurnWithFromMintTokenPool_releaseOrMint is BurnWithFromMintRebasingTokenPoolSetup { | ||
| function test_Setup_Success() public view { | ||
| assertEq(address(s_rebasingToken), address(s_pool.getToken())); | ||
| assertEq(address(s_mockRMN), s_pool.getRmnProxy()); | ||
| assertEq(false, s_pool.getAllowListEnabled()); | ||
| assertEq(type(uint256).max, s_rebasingToken.allowance(address(s_pool), address(s_pool))); | ||
| assertEq("BurnWithFromMintRebasingTokenPool 1.5.0", s_pool.typeAndVersion()); | ||
| } | ||
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| function test_releaseOrMint_Success() public { | ||
| uint256 amount = 1000; | ||
| uint256 balancePre = s_rebasingToken.balanceOf(address(OWNER)); | ||
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| Pool.ReleaseOrMintOutV1 memory releaseOrMintOut = s_pool.releaseOrMint(_getReleaseOrMintIn(amount)); | ||
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| assertEq(amount, releaseOrMintOut.destinationAmount); | ||
| assertEq(balancePre + amount, s_rebasingToken.balanceOf(address(OWNER))); | ||
| } | ||
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| function testFuzz_releaseOrMint_rebasing_success(uint16 multiplierPercentage) public { | ||
| uint256 amount = 1000; | ||
| uint256 expectedAmount = amount * multiplierPercentage / 100; | ||
|
There was a problem hiding this comment. q: if percentage is 0, this should still succeed right because There was a problem hiding this comment. Is There was a problem hiding this comment. Correct, I would call that case valid. The check is mostly there so 1) don't allow theft and 2) to not revert with an underflow when calculating the returned value |
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| s_rebasingToken.setMultiplierPercentage(multiplierPercentage); | ||
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| uint256 balancePre = s_rebasingToken.balanceOf(address(OWNER)); | ||
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| Pool.ReleaseOrMintOutV1 memory releaseOrMintOut = s_pool.releaseOrMint(_getReleaseOrMintIn(amount)); | ||
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| assertEq(expectedAmount, releaseOrMintOut.destinationAmount); | ||
| assertEq(balancePre + expectedAmount, s_rebasingToken.balanceOf(address(OWNER))); | ||
| } | ||
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| function test_releaseOrMint_NegativeMintAmount_reverts() public { | ||
| uint256 amount = 1000; | ||
| s_rebasingToken.setMintShouldBurn(true); | ||
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| vm.expectRevert(abi.encodeWithSelector(BurnWithFromMintRebasingTokenPool.NegativeMintAmount.selector, amount)); | ||
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| s_pool.releaseOrMint(_getReleaseOrMintIn(amount)); | ||
| } | ||
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| function _getReleaseOrMintIn(uint256 amount) internal view returns (Pool.ReleaseOrMintInV1 memory) { | ||
| return Pool.ReleaseOrMintInV1({ | ||
| originalSender: bytes(""), | ||
| receiver: OWNER, | ||
| amount: amount, | ||
| localToken: address(s_rebasingToken), | ||
| remoteChainSelector: DEST_CHAIN_SELECTOR, | ||
| sourcePoolAddress: abi.encode(s_remoteBurnMintPool), | ||
| sourcePoolData: "", | ||
| offchainTokenData: "" | ||
| }); | ||
| } | ||
| } | ||
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The other way of writing it cannot be overridden