add (success, netAmount) return to riskpool fund/defundBundle

Author: matthiaszimmermann

contracts/components/IRiskpool.sol

@@ -21,8 +21,8 @@ interface IRiskpool is IComponent {
     event LogRiskpoolBalanceDecreased(bytes32 processId, uint256 amount, uint256 newBalance);
 
     function createBundle(bytes calldata filter, uint256 initialAmount) external returns(uint256 bundleId);
-    function fundBundle(uint256 bundleId, uint256 amount) external;
-    function defundBundle(uint256 bundleId, uint256 amount) external;
+    function fundBundle(uint256 bundleId, uint256 amount) external returns(bool success, uint256 netAmount);
+    function defundBundle(uint256 bundleId, uint256 amount) external returns(bool success, uint256 netAmount);
 
     function lockBundle(uint256 bundleId) external;
     function unlockBundle(uint256 bundleId) external;

contracts/components/Riskpool.sol

@@ -99,15 +99,17 @@ abstract contract Riskpool is
     function fundBundle(uint256 bundleId, uint256 amount) 
         external override
         onlyBundleOwner(bundleId)
+        returns(bool success, uint256 netAmount)
     {
-        _riskpoolService.fundBundle(bundleId, amount);
+        (success, netAmount) = _riskpoolService.fundBundle(bundleId, amount);
     }
 
     function defundBundle(uint256 bundleId, uint256 amount)
         external override
         onlyBundleOwner(bundleId)
+        returns(bool success, uint256 netAmount)
     {
-        _riskpoolService.defundBundle(bundleId, amount);
+        (success, netAmount) = _riskpoolService.defundBundle(bundleId, amount);
     }
 
     function lockBundle(uint256 bundleId)

contracts/services/IRiskpoolService.sol

@@ -4,8 +4,8 @@ pragma solidity ^0.8.0;
 interface IRiskpoolService {
 
     function createBundle(address owner_, bytes calldata filter_, uint256 amount_) external returns(uint256 bundleId);
-    function fundBundle(uint256 bundleId, uint256 amount) external;
-    function defundBundle(uint256 bundleId, uint256 amount) external;
+    function fundBundle(uint256 bundleId, uint256 amount) external returns(bool success, uint256 netAmount);
+    function defundBundle(uint256 bundleId, uint256 amount) external returns(bool success, uint256 netAmount);
 
     function lockBundle(uint256 bundleId) external;
     function unlockBundle(uint256 bundleId) external;