fee splitter

src/periphery/FeeSplitter.sol

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+pragma solidity ^0.8.18;
+
+import "lyra-utils/decimals/SignedDecimalMath.sol";
+
+import {Ownable2Step} from "openzeppelin/access/Ownable2Step.sol";
+import {IManager} from "v2-core/src/interfaces/IManager.sol";
+import {ISubAccounts, IAsset} from "v2-core/src/interfaces/ISubAccounts.sol";
+
+/**
+ * @title FeeSplitter
+ * @notice FeeSplitter is a contract that splits the balance of a subaccount held by this contract based on a % split
+ * @author Lyra
+ */
+contract FeeSplitter is Ownable2Step {
+  using SignedDecimalMath for int;
+
+  ISubAccounts public immutable subAccounts;
+  IAsset public immutable cashAsset;
+
+  uint public subAcc;
+  uint public splitPercent = 0.5e18;
+  uint public accountA;
+  uint public accountB;
+
+  constructor(ISubAccounts _subAccounts, IManager manager, IAsset _cashAsset) {
+    subAccounts = _subAccounts;
+    subAcc = _subAccounts.createAccount(address(this), manager);
+    cashAsset = _cashAsset;
+  }
+
+  ///////////
+  // Admin //
+  ///////////
+
+  /// @notice Set the % split
+  function setSplit(uint _splitPercent) external onlyOwner {
+    if (_splitPercent > 1e18) {
+      revert FS_InvalidSplitPercentage();
+    }
+    splitPercent = _splitPercent;
+
+    emit SplitPercentSet(_splitPercent);
+  }
+
+  /// @notice Set the subaccounts to split the balance between
+  function setSubAccounts(uint _accountA, uint _accountB) external onlyOwner {
+    accountA = _accountA;
+    accountB = _accountB;
+
+    emit SubAccountsSet(_accountA, _accountB);
+  }
+
+  /// @notice Recover a subaccount held by this contract, creating a new one in its place
+  function recoverSubAccount(address recipient) external onlyOwner {
+    uint oldSubAcc = subAcc;
+    subAccounts.transferFrom(address(this), recipient, oldSubAcc);
+    subAcc = subAccounts.createAccount(address(this), subAccounts.manager(oldSubAcc));
+
+    emit SubAccountRecovered(oldSubAcc, recipient, subAcc);
+  }
+
+  //////////////
+  // External //
+  //////////////
+  /// @notice Work out the balance of the subaccount held by this contract, and split it based on the % split
+  function split() external {
+    int balance = subAccounts.getBalance(subAcc, cashAsset, 0);
+
+    if (balance <= 0) {
+      revert FS_NoBalanceToSplit();
+    }
+
+    int splitAmountA = balance.multiplyDecimal(int(splitPercent));
+    int splitAmountB = balance - splitAmountA;
+
+    ISubAccounts.AssetTransfer[] memory transfers = new ISubAccounts.AssetTransfer[](2);
+    transfers[0] = ISubAccounts.AssetTransfer({
+      fromAcc: subAcc,
+      toAcc: accountA,
+      asset: cashAsset,
+      subId: 0,
+      amount: int(splitAmountA),
+      assetData: bytes32(0)
+    });
+    transfers[1] = ISubAccounts.AssetTransfer({
+      fromAcc: subAcc,
+      toAcc: accountB,
+      asset: cashAsset,
+      subId: 0,
+      amount: int(splitAmountB),
+      assetData: bytes32(0)
+    });
+
+    subAccounts.submitTransfers(transfers, "");
+
+    emit BalanceSplit(subAcc, accountA, accountB, splitAmountA, splitAmountB);
+  }
+
+  ////////////
+  // Errors //
+  ////////////
+  error FS_InvalidSplitPercentage();
+  error FS_NoBalanceToSplit();
+
+  ////////////
+  // Events //
+  ////////////
+  event SplitPercentSet(uint splitPercent);
+  event SubAccountsSet(uint accountA, uint accountB);
+  event SubAccountRecovered(uint oldSubAcc, address recipient, uint newSubAcc);
+  event BalanceSplit(uint subAcc, uint accountA, uint accountB, int splitAmountA, int splitAmountB);
+}

test/periphery/FeeSplitter.t.sol

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+pragma solidity ^0.8.18;
+
+import {IntegrationTestBase} from "v2-core/test/integration-tests/shared/IntegrationTestBase.t.sol";
+import {IManager} from "v2-core/src/interfaces/IManager.sol";
+import {IAsset} from "v2-core/src/interfaces/IAsset.sol";
+import {ISubAccounts} from "v2-core/src/interfaces/ISubAccounts.sol";
+
+import "forge-std/console2.sol";
+import "../../src/periphery/FeeSplitter.sol";
+
+contract FeeSplitterTest is IntegrationTestBase {
+  FeeSplitter public feeSplitter;
+  IAsset public asset;
+  uint public accountA;
+  uint public accountB;
+
+  function setUp() public {
+    _setupIntegrationTestComplete();
+
+    accountA = subAccounts.createAccount(address(this), srm);
+    accountB = subAccounts.createAccount(address(this), markets["weth"].pmrm);
+
+    feeSplitter = new FeeSplitter(subAccounts, srm, cash);
+    feeSplitter.setSubAccounts(accountA, accountB);
+    feeSplitter.setSplit(0.5e18);
+    uint amount = 100e6;
+    usdc.mint(address(this), amount);
+    usdc.approve(address(cash), amount);
+    cash.deposit(feeSplitter.subAcc(), amount);
+  }
+
+  function test_constructor() public {
+    assertEq(address(feeSplitter.subAccounts()), address(subAccounts), "Incorrect subAccounts");
+    assertEq(address(feeSplitter.cashAsset()), address(cash), "Incorrect cashAsset");
+    assertFalse(feeSplitter.subAcc() == 0, "Incorrect subAcc");
+    assertEq(feeSplitter.splitPercent(), 0.5e18, "Incorrect splitPercent");
+    assertEq(feeSplitter.accountA(), accountA, "Incorrect accountA");
+    assertEq(feeSplitter.accountB(), accountB, "Incorrect accountB");
+  }
+
+  function test_setSplit() public {
+    feeSplitter.setSplit(0.6e18);
+    assertEq(feeSplitter.splitPercent(), 0.6e18, "Incorrect splitPercent");
+
+    vm.expectRevert(FeeSplitter.FS_InvalidSplitPercentage.selector);
+    feeSplitter.setSplit(1.1e18);
+  }
+
+  function test_split() public {
+    // before split
+    assertEq(
+      subAccounts.getBalance(feeSplitter.subAcc(), cash, 0), int(100e18), "Incorrect initial balance in FeeSplitter"
+    );
+    assertEq(subAccounts.getBalance(accountA, cash, 0), 0, "Account A should initially have 0 balance");
+    assertEq(subAccounts.getBalance(accountB, cash, 0), 0, "Account B should initially have 0 balance");
+
+    feeSplitter.split();
+
+    // after split
+    assertEq(
+      subAccounts.getBalance(accountA, cash, 0), int(50e18), "Account A should have half of the funds after split"
+    );
+    assertEq(
+      subAccounts.getBalance(accountB, cash, 0), int(50e18), "Account B should have half of the funds after split"
+    );
+
+    vm.expectRevert(FeeSplitter.FS_NoBalanceToSplit.selector);
+    feeSplitter.split();
+  }
+
+  function test_recover() public {
+    uint oldSubAcc = feeSplitter.subAcc();
+    feeSplitter.recoverSubAccount(address(this));
+    uint newSubAcc = feeSplitter.subAcc();
+    assertEq(
+      subAccounts.ownerOf(newSubAcc), address(feeSplitter), "New subAcc should be owned by fee splitter contract"
+    );
+    assertEq(subAccounts.ownerOf(oldSubAcc), address(this), "Old subAcc should be owned by this contract");
+    assertFalse(oldSubAcc == newSubAcc);
+  }
+}