Merge pull request #9 from baileyspraggins/chainlink_rate_factory

ChainlinkRateProviderFactory

contracts/BaseRateProviderFactory.sol

@@ -0,0 +1,38 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+pragma solidity ^0.8.0;
+
+import "./interfaces/IBaseRateProviderFactory.sol";
+
+/**
+ * @title Base Rate Provider Factory
+ * @notice Base Factory for creating RateProviders
+ * @dev This is a base contract for building factories that create RateProviders.
+ */
+contract BaseRateProviderFactory is IBaseRateProviderFactory {
+    // Mapping of rate providers created by this factory.
+    mapping(address => bool) private _isRateProviderFromFactory;
+
+    event RateProviderCreated(address indexed rateProvider);
+
+    function isRateProviderFromFactory(address rateProvider) external view returns (bool) {
+        return _isRateProviderFromFactory[rateProvider];
+    }
+
+    function _onCreate(address rateProvider) internal {
+        _isRateProviderFromFactory[rateProvider] = true;
+        emit RateProviderCreated(rateProvider);
+    }
+}

contracts/ChainlinkRateProviderFactory.sol

@@ -0,0 +1,39 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+pragma solidity ^0.8.0;
+
+import "@chainlink/contracts/src/v0.8/interfaces/AggregatorV3Interface.sol";
+
+import "./BaseRateProviderFactory.sol";
+import "./ChainlinkRateProvider.sol";
+
+/**
+ * @title Chainlink Rate Provider Factory
+ * @notice Factory for creating ChainlinkRateProviders
+ * @dev This contract is used to create ChainlinkRateProvider contracts.
+ *      RateProviders created by this factory are to be used in environments
+ *      where the Chainlink registry is not available.
+ */
+contract ChainlinkRateProviderFactory is BaseRateProviderFactory {
+    /**
+     * @notice Deploys a new ChainlinkRateProvider contract using a price feed.
+     * @param feed - The Chainlink price feed contract.
+     */
+    function create(AggregatorV3Interface feed) external returns (ChainlinkRateProvider) {
+        ChainlinkRateProvider rateProvider = new ChainlinkRateProvider(feed);
+        _onCreate(address(rateProvider));
+        return rateProvider;
+    }
+}

contracts/interfaces/IBaseRateProviderFactory.sol

@@ -0,0 +1,24 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+pragma solidity ^0.8.0;
+
+interface IBaseRateProviderFactory {
+    /**
+     * @dev Checks if a rate provider was created by the derived factory.
+     * @param rateProvider - Address of the rate provider to check.
+     * @return bool - True if the rate provider was created by the derived factory.
+     */
+    function isRateProviderFromFactory(address rateProvider) external view returns (bool);
+}