Merge branch 'feat/117-oracle-weth' into 'master'

Added management of WETH to ChainlinkProxyPriceProvider.

Closes #117

See merge request aave-tech/protocol-v2!128

contracts/misc/ChainlinkProxyPriceProvider.sol

@@ -18,11 +18,13 @@ import {SafeERC20} from '../dependencies/openzeppelin/contracts/SafeERC20.sol';
 contract ChainlinkProxyPriceProvider is IPriceOracleGetter, Ownable {
   using SafeERC20 for IERC20;
 
+  event WethSet(address indexed weth);
   event AssetSourceUpdated(address indexed asset, address indexed source);
   event FallbackOracleUpdated(address indexed fallbackOracle);
 
   mapping(address => IChainlinkAggregator) private assetsSources;
   IPriceOracleGetter private _fallbackOracle;
+  address public immutable WETH;
 
   /// @notice Constructor
   /// @param assets The addresses of the assets
@@ -32,10 +34,13 @@ contract ChainlinkProxyPriceProvider is IPriceOracleGetter, Ownable {
   constructor(
     address[] memory assets,
     address[] memory sources,
-    address fallbackOracle
+    address fallbackOracle,
+    address weth
   ) public {
     _setFallbackOracle(fallbackOracle);
     _setAssetsSources(assets, sources);
+    WETH = weth;
+    emit WethSet(weth);
   }
 
   /// @notice External function called by the Aave governance to set or replace sources of assets
@@ -77,8 +82,10 @@ contract ChainlinkProxyPriceProvider is IPriceOracleGetter, Ownable {
   /// @param asset The asset address
   function getAssetPrice(address asset) public override view returns (uint256) {
     IChainlinkAggregator source = assetsSources[asset];
-    // If there is no registered source for the asset, call the fallbackOracle
+
-    if (address(source) == address(0)) {
+    if (asset == WETH) {
+      return 1 ether;
+    } else if (address(source) == address(0)) {
       return _fallbackOracle.getAssetPrice(asset);
     } else {
       int256 price = IChainlinkAggregator(source).latestAnswer();

helpers/contracts-deployments.ts

@@ -189,7 +189,7 @@ export const deployMockAggregator = async (price: tStringTokenSmallUnits, verify
   );
 
 export const deployChainlinkProxyPriceProvider = async (
-  args: [tEthereumAddress[], tEthereumAddress[], tEthereumAddress],
+  args: [tEthereumAddress[], tEthereumAddress[], tEthereumAddress, tEthereumAddress],
   verify?: boolean
 ) =>
   withSaveAndVerify(

tasks/dev/4_oracles.ts

@@ -13,7 +13,7 @@ import {
 import {ICommonConfiguration, iAssetBase, TokenContractId} from '../../helpers/types';
 import {waitForTx} from '../../helpers/misc-utils';
 import {getAllAggregatorsAddresses, getAllTokenAddresses} from '../../helpers/mock-helpers';
-import {ConfigNames, loadPoolConfig} from '../../helpers/configuration';
+import {ConfigNames, loadPoolConfig, getWethAddress} from '../../helpers/configuration';
 import {
   getAllMockedTokens,
   getLendingPoolAddressesProvider,
@@ -58,7 +58,10 @@ task('dev:deploy-oracles', 'Deploy oracles for dev enviroment')
       allAggregatorsAddresses
     );
 
-    await deployChainlinkProxyPriceProvider([tokens, aggregators, fallbackOracle.address], verify);
+    await deployChainlinkProxyPriceProvider(
+      [tokens, aggregators, fallbackOracle.address, await getWethAddress(poolConfig)],
+      verify
+    );
     await waitForTx(await addressesProvider.setPriceOracle(fallbackOracle.address));
 
     const lendingRateOracle = await deployLendingRateOracle(verify);

tasks/full/3_oracles.ts

@@ -7,7 +7,7 @@ import {
 import {setInitialMarketRatesInRatesOracleByHelper} from '../../helpers/oracles-helpers';
 import {ICommonConfiguration, eEthereumNetwork, SymbolMap} from '../../helpers/types';
 import {waitForTx, filterMapBy} from '../../helpers/misc-utils';
-import {ConfigNames, loadPoolConfig} from '../../helpers/configuration';
+import {ConfigNames, loadPoolConfig, getWethAddress} from '../../helpers/configuration';
 import {exit} from 'process';
 import {
   getLendingPoolAddressesProvider,
@@ -46,7 +46,7 @@ task('full:deploy-oracles', 'Deploy oracles for dev enviroment')
       const [tokens, aggregators] = getPairsTokenAggregator(tokensToWatch, chainlinkAggregators);
 
       const chainlinkProviderPriceProvider = await deployChainlinkProxyPriceProvider(
-        [tokens, aggregators, fallbackOracle],
+        [tokens, aggregators, fallbackOracle, await getWethAddress(poolConfig)],
         verify
       );
       await waitForTx(

test/__setup.spec.ts

@@ -205,6 +205,7 @@ const buildTestEnv = async (deployer: Signer, secondaryWallet: Signer) => {
     tokens,
     aggregators,
     fallbackOracle.address,
+    mockTokens.WETH.address
   ]);
   await waitForTx(await addressesProvider.setPriceOracle(fallbackOracle.address));