From ab6a1996fbe7373880eabf0a7abb4dc83b0433b6 Mon Sep 17 00:00:00 2001
From: eboado <ebdmrr@gmail.com>
Date: Fri, 5 Apr 2024 15:35:37 +0200
Subject: [PATCH] - Added revert to previous rate strategy.

---
 ...eum_UpgradeAMPLImplementation_20240402.sol | 34 +++++++++++++++++--
 .../UpgradeAMPLImplementation.md              | 12 +++++++
 2 files changed, 43 insertions(+), 3 deletions(-)

diff --git a/src/20240402_AaveV2Ethereum_UpgradeAMPLImplementation/AaveV2Ethereum_UpgradeAMPLImplementation_20240402.sol b/src/20240402_AaveV2Ethereum_UpgradeAMPLImplementation/AaveV2Ethereum_UpgradeAMPLImplementation_20240402.sol
index ddc009c89..9a7558958 100644
--- a/src/20240402_AaveV2Ethereum_UpgradeAMPLImplementation/AaveV2Ethereum_UpgradeAMPLImplementation_20240402.sol
+++ b/src/20240402_AaveV2Ethereum_UpgradeAMPLImplementation/AaveV2Ethereum_UpgradeAMPLImplementation_20240402.sol
@@ -1,20 +1,48 @@
 // SPDX-License-Identifier: MIT
 pragma solidity ^0.8.0;
 
-import {IProposalGenericExecutor} from 'aave-helpers/interfaces/IProposalGenericExecutor.sol';
+import {IAaveV2ConfigEngine} from 'aave-helpers/v2-config-engine/IAaveV2ConfigEngine.sol';
+import {IV2RateStrategyFactory} from 'aave-helpers/v2-config-engine/IV2RateStrategyFactory.sol';
+import {EngineFlags} from 'aave-helpers/v3-config-engine/EngineFlags.sol';
+import {AaveV2EthereumAssets} from 'aave-address-book/AaveV2Ethereum.sol';
+import {AaveV2Ethereum, AaveV2PayloadEthereum} from 'aave-helpers/v2-config-engine/AaveV2PayloadEthereum.sol';
+
 /**
  * @title Upgrade AMPL implementation
  * @author BGD Labs
  * - Snapshot: https://snapshot.org/#/aave.eth/proposal/0xb7226dd6441b67225924082215f7a512bfd98252897ee43a879084e07ab53607
  * - Discussion: https://governance.aave.com/t/arfc-aampl-interim-distribution/17184
  */
-contract AaveV2Ethereum_UpgradeAMPLImplementation_20240402 is IProposalGenericExecutor {
+contract AaveV2Ethereum_UpgradeAMPLImplementation_20240402 is AaveV2PayloadEthereum {
   address constant A_TOKEN_IMPL = address(0);
 
-  function execute() external {
+  function _preExecute() internal override {
     AaveV2Ethereum.POOL_CONFIGURATOR.updateAToken(
       AaveV2EthereumAssets.AMPL_UNDERLYING,
       A_TOKEN_IMPL
     );
   }
+
+  function rateStrategiesUpdates()
+    public
+    pure
+    override
+    returns (IAaveV2ConfigEngine.RateStrategyUpdate[] memory)
+  {
+    IAaveV2ConfigEngine.RateStrategyUpdate[]
+      memory rateStrategies = new IAaveV2ConfigEngine.RateStrategyUpdate[](1);
+    rateStrategies[0] = IAaveV2ConfigEngine.RateStrategyUpdate({
+      asset: AaveV2EthereumAssets.AMPL_UNDERLYING,
+      params: IV2RateStrategyFactory.RateStrategyParams({
+        optimalUtilizationRate: EngineFlags.KEEP_CURRENT,
+        baseVariableBorrowRate: EngineFlags.KEEP_CURRENT,
+        variableRateSlope1: EngineFlags.KEEP_CURRENT,
+        variableRateSlope2: _bpsToRay(300_00),
+        stableRateSlope1: EngineFlags.KEEP_CURRENT,
+        stableRateSlope2: EngineFlags.KEEP_CURRENT
+      })
+    });
+
+    return rateStrategies;
+  }
 }
diff --git a/src/20240402_AaveV2Ethereum_UpgradeAMPLImplementation/UpgradeAMPLImplementation.md b/src/20240402_AaveV2Ethereum_UpgradeAMPLImplementation/UpgradeAMPLImplementation.md
index e186cedb4..070afe58f 100644
--- a/src/20240402_AaveV2Ethereum_UpgradeAMPLImplementation/UpgradeAMPLImplementation.md
+++ b/src/20240402_AaveV2Ethereum_UpgradeAMPLImplementation/UpgradeAMPLImplementation.md
@@ -16,11 +16,23 @@ While work is being made to determined the exact claims, there has been a propos
 
 Therefore transfers aAMPL and withdrawals of AMPL will be disabled, while repayments and liquidations will stay intact.
 
+In addition, after validating there is no impact of it on the borrow side, the interest rate strategy of AMPL is reverted to the one that was configured before [proposal 16](https://vote.onaave.com/proposal/?proposalId=16), when parameters where lowered for pre-caution.
+The goal of this is to, as intended, still apply growth on the borrow side, specially for currently healthy positions (non-liquidated).
+
 ## Specification
 
 The proposal will call:
 
 - `AaveV2Ethereum.POOL_CONFIGURATOR.updateAToken(AaveV2EthereumAssets.AMPL_UNDERLYING, A_TOKEN_IMPL);` to replace the aToken implementation
+- Change the AMPL interest rate strategy to the previous one, with the following configuration:
+
+| Parameter      | Current | Recommended |
+| -------------- | ------- | ----------- |
+| Base           | 20%     | No Change   |
+| Slope1         | 0%      | No Change   |
+| Slope2         | 0%      | 300%        |
+| Uoptimal       | 80%     | No Change   |
+| Reserve Factor | 99.00%  | No Change   |
 
 ## References