EncumbranceSpend event

compound-finance · Jul 17, 2023 · b1bbca9 · b1bbca9
1 parent 3c6bcbb
commit b1bbca9
Show file tree

Hide file tree

Showing 2 changed files with 9 additions and 0 deletions.
diff --git a/src/EncumberableToken.sol b/src/EncumberableToken.sol
@@ -14,6 +14,11 @@ import { IERC7246 } from "./interfaces/IERC7246.sol";
  * @author Compound
  */
 contract EncumberableToken is ERC20, IERC20Permit, IERC7246 {
+    /**
+     * @dev Emitted when `taker` spends `amount` of their encumbrance from `owner`
+     */
+    event EncumbranceSpend(address indexed owner, address indexed taker, uint256 previousEncumbrance, uint256 newEncumbrance);
+
     /// @notice The major version of this contract
     string public constant VERSION = "1";
 
@@ -133,6 +138,7 @@ contract EncumberableToken is ERC20, IERC20Permit, IERC7246 {
         uint256 newEncumbrance = currentEncumbrance - amount;
         encumbrances[owner][taker] = newEncumbrance;
         encumberedBalanceOf[owner] -= amount;
+        emit EncumbranceSpend(owner, taker, currentEncumbrance, newEncumbrance);
     }
 
     /**

diff --git a/test/EncumberableToken.t.sol b/test/EncumberableToken.t.sol
@@ -9,6 +9,7 @@ import { EncumberableToken } from "../src/EncumberableToken.sol";
 contract EncumberableTokenTest is Test {
     event Encumber(address indexed owner, address indexed taker, uint amount);
     event Release(address indexed owner, address indexed taker, uint amount);
+    event EncumbranceSpend(address indexed owner, address indexed taker, uint256 previousEncumbrance, uint256 newEncumbrance);
 
     ERC20 public underlyingToken;
     EncumberableToken public wrappedToken;
@@ -142,6 +143,8 @@ contract EncumberableTokenTest is Test {
 
         // bob calls transfers from alice to charlie
         vm.prank(bob);
+        vm.expectEmit(true, true, true, true);
+        emit EncumbranceSpend(alice, bob, 60e18, 20e18);
         wrappedToken.transferFrom(alice, charlie, 40e18);
 
         // alice balance is reduced