- Added general setter and getter of address to LendingPoolAddressesProvider.

- Adapted style of LendingPoolAddressesProviderRegistry, adding public getter function in the process.

contracts/configuration/LendingPoolAddressesProvider.sol

@@ -30,12 +30,41 @@ contract LendingPoolAddressesProvider is Ownable, ILendingPoolAddressesProvider
   bytes32 private constant LENDING_RATE_ORACLE = 'LENDING_RATE_ORACLE';
   bytes32 private constant WALLET_BALANCE_PROVIDER = 'WALLET_BALANCE_PROVIDER';
 
+  /**
+   * @dev Sets an address for an id, allowing to cover it or not with a proxy
+   * @param id The id
+   * @param newAddress The address to set, pass address(0) if a proxy is needed
+   * @param implementationAddress The address of the implementation if we want it covered by a proxy
+   * address(0) if we don't want a proxy covering
+   */
+  function setAddress(
+    bytes32 id,
+    address newAddress,
+    address implementationAddress
+  ) external override onlyOwner {
+    if (implementationAddress != address(0)) {
+      _updateImpl(id, implementationAddress);
+      emit AddressSet(id, implementationAddress, true);
+    } else {
+      _addresses[id] = newAddress;
+      emit AddressSet(id, newAddress, false);
+    }
+  }
+
+  /**
+   * @dev Returns an address by id
+   * @return The address
+   */
+  function getAddress(bytes32 id) public override view returns (address) {
+    return _addresses[id];
+  }
+
   /**
    * @dev returns the address of the LendingPool proxy
    * @return the lending pool proxy address
    **/
   function getLendingPool() external override view returns (address) {
-    return _addresses[LENDING_POOL];
+    return getAddress(LENDING_POOL);
   }
 
   /**
@@ -52,7 +81,7 @@ contract LendingPoolAddressesProvider is Ownable, ILendingPoolAddressesProvider
    * @return the lending pool configurator proxy address
    **/
   function getLendingPoolConfigurator() external override view returns (address) {
-    return _addresses[LENDING_POOL_CONFIGURATOR];
+    return getAddress(LENDING_POOL_CONFIGURATOR);
   }
 
   /**
@@ -72,7 +101,7 @@ contract LendingPoolAddressesProvider is Ownable, ILendingPoolAddressesProvider
    **/
 
   function getLendingPoolCollateralManager() external override view returns (address) {
-    return _addresses[LENDING_POOL_COLLATERAL_MANAGER];
+    return getAddress(LENDING_POOL_COLLATERAL_MANAGER);
   }
 
   /**
@@ -90,7 +119,7 @@ contract LendingPoolAddressesProvider is Ownable, ILendingPoolAddressesProvider
    **/
 
   function getAaveAdmin() external override view returns (address) {
-    return _addresses[AAVE_ADMIN];
+    return getAddress(AAVE_ADMIN);
   }
 
   function setAaveAdmin(address aaveAdmin) external override onlyOwner {
@@ -99,7 +128,7 @@ contract LendingPoolAddressesProvider is Ownable, ILendingPoolAddressesProvider
   }
 
   function getPriceOracle() external override view returns (address) {
-    return _addresses[PRICE_ORACLE];
+    return getAddress(PRICE_ORACLE);
   }
 
   function setPriceOracle(address priceOracle) external override onlyOwner {
@@ -108,7 +137,7 @@ contract LendingPoolAddressesProvider is Ownable, ILendingPoolAddressesProvider
   }
 
   function getLendingRateOracle() external override view returns (address) {
-    return _addresses[LENDING_RATE_ORACLE];
+    return getAddress(LENDING_RATE_ORACLE);
   }
 
   function setLendingRateOracle(address lendingRateOracle) external override onlyOwner {

contracts/configuration/LendingPoolAddressesProviderRegistry.sol

@@ -14,8 +14,8 @@ import {Errors} from '../libraries/helpers/Errors.sol';
  **/
 
 contract LendingPoolAddressesProviderRegistry is Ownable, ILendingPoolAddressesProviderRegistry {
-  mapping(address => uint256) addressesProviders;
-  address[] addressesProvidersList;
+  mapping(address => uint256) private _addressesProviders;
+  address[] private _addressesProvidersList;
 
   /**
    * @dev returns if an addressesProvider is registered or not
@@ -28,7 +28,7 @@ contract LendingPoolAddressesProviderRegistry is Ownable, ILendingPoolAddressesP
     view
     returns (uint256)
   {
-    return addressesProviders[provider];
+    return _addressesProviders[provider];
   }
 
   /**
@@ -36,13 +36,13 @@ contract LendingPoolAddressesProviderRegistry is Ownable, ILendingPoolAddressesP
    * @return the list of addressesProviders
    **/
   function getAddressesProvidersList() external override view returns (address[] memory) {
-    uint256 maxLength = addressesProvidersList.length;
+    uint256 maxLength = _addressesProvidersList.length;
 
     address[] memory activeProviders = new address[](maxLength);
 
-    for (uint256 i = 0; i < addressesProvidersList.length; i++) {
-      if (addressesProviders[addressesProvidersList[i]] > 0) {
-        activeProviders[i] = addressesProvidersList[i];
+    for (uint256 i = 0; i < _addressesProvidersList.length; i++) {
+      if (_addressesProviders[_addressesProvidersList[i]] > 0) {
+        activeProviders[i] = _addressesProvidersList[i];
       }
     }
 
@@ -54,7 +54,7 @@ contract LendingPoolAddressesProviderRegistry is Ownable, ILendingPoolAddressesP
    * @param provider the pool address to be registered
    **/
   function registerAddressesProvider(address provider, uint256 id) external override onlyOwner {
-    addressesProviders[provider] = id;
+    _addressesProviders[provider] = id;
     _addToAddressesProvidersList(provider);
     emit AddressesProviderRegistered(provider);
   }
@@ -64,8 +64,8 @@ contract LendingPoolAddressesProviderRegistry is Ownable, ILendingPoolAddressesP
    * @param provider the pool address to be unregistered
    **/
   function unregisterAddressesProvider(address provider) external override onlyOwner {
-    require(addressesProviders[provider] > 0, Errors.PROVIDER_NOT_REGISTERED);
-    addressesProviders[provider] = 0;
+    require(_addressesProviders[provider] > 0, Errors.PROVIDER_NOT_REGISTERED);
+    _addressesProviders[provider] = 0;
     emit AddressesProviderUnregistered(provider);
   }
 
@@ -74,12 +74,25 @@ contract LendingPoolAddressesProviderRegistry is Ownable, ILendingPoolAddressesP
    * @param provider the pool address to be added
    **/
   function _addToAddressesProvidersList(address provider) internal {
-    for (uint256 i = 0; i < addressesProvidersList.length; i++) {
-      if (addressesProvidersList[i] == provider) {
+    for (uint256 i = 0; i < _addressesProvidersList.length; i++) {
+      if (_addressesProvidersList[i] == provider) {
         return;
       }
     }
 
-    addressesProvidersList.push(provider);
+    _addressesProvidersList.push(provider);
+  }
+
+  /**
+   * @dev Returns the id on an `addressesProvider` or address(0) if not registered
+   * @return The id or address(0)
+   */
+  function getAddressesProviderIdByAddress(address addressesProvider)
+    external
+    override
+    view
+    returns (uint256)
+  {
+    return _addressesProviders[addressesProvider];
   }
 }

contracts/interfaces/ILendingPoolAddressesProvider.sol

@@ -7,7 +7,6 @@ pragma solidity ^0.6.8;
  */
 
 interface ILendingPoolAddressesProvider {
-  //events
   event LendingPoolUpdated(address indexed newAddress);
   event AaveAdminUpdated(address indexed newAddress);
   event LendingPoolConfiguratorUpdated(address indexed newAddress);
@@ -15,8 +14,16 @@ interface ILendingPoolAddressesProvider {
   event EthereumAddressUpdated(address indexed newAddress);
   event PriceOracleUpdated(address indexed newAddress);
   event LendingRateOracleUpdated(address indexed newAddress);
-
   event ProxyCreated(bytes32 id, address indexed newAddress);
+  event AddressSet(bytes32 id, address indexed newAddress, bool hasProxy);
+
+  function setAddress(
+    bytes32 id,
+    address newAddress,
+    address impl
+  ) external;
+
+  function getAddress(bytes32 id) external view returns (address);
 
   function getLendingPool() external view returns (address);
 

contracts/interfaces/ILendingPoolAddressesProviderRegistry.sol

@@ -5,9 +5,7 @@ pragma solidity ^0.6.8;
  * @title ILendingPoolAddressesProvider interface
  * @notice provides the interface to fetch the LendingPoolCore address
  **/
-
 interface ILendingPoolAddressesProviderRegistry {
-  //events
   event AddressesProviderRegistered(address indexed newAddress);
   event AddressesProviderUnregistered(address indexed newAddress);
 
@@ -15,6 +13,11 @@ interface ILendingPoolAddressesProviderRegistry {
 
   function isAddressesProviderRegistered(address provider) external view returns (uint256);
 
+  function getAddressesProviderIdByAddress(address addressesProvider)
+    external
+    view
+    returns (uint256);
+
   function registerAddressesProvider(address provider, uint256 id) external;
 
   function unregisterAddressesProvider(address provider) external;

test/lending-pool-addresses-provider.spec.ts

@@ -2,6 +2,10 @@ import {expect} from 'chai';
 import {createRandomAddress} from '../helpers/misc-utils';
 import {makeSuite, TestEnv} from './helpers/make-suite';
 import {ProtocolErrors} from '../helpers/types';
+import {ethers} from 'ethers';
+import {ZERO_ADDRESS} from '../helpers/constants';
+
+const {utils} = ethers;
 
 makeSuite('LendingPoolAddressesProvider', (testEnv: TestEnv) => {
   it('Test the accessibility of the LendingPoolAddressesProvider', async () => {
@@ -21,5 +25,13 @@ makeSuite('LendingPoolAddressesProvider', (testEnv: TestEnv) => {
     ]) {
       await expect(contractFunction(mockAddress)).to.be.revertedWith(INVALID_OWNER_REVERT_MSG);
     }
+
+    await expect(
+      addressesProvider.setAddress(
+        utils.keccak256(utils.toUtf8Bytes('RANDOM_ID')),
+        mockAddress,
+        ZERO_ADDRESS
+      )
+    ).to.be.revertedWith(INVALID_OWNER_REVERT_MSG);
   });
 });