[solidity sdk] Add zerolend AggregatorV3 adapter to SDK (#1437)

* add zerolend cl adapter to sdk

* bump versions

Author: jayantk

licenses/zerolend-pyth-oracles.md

@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2022 Antonio
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

package-lock.json

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+// SPDX-License-Identifier: Apache 2
+pragma solidity ^0.8.0;
+
+import {PythStructs} from "./PythStructs.sol";
+import {IPyth} from "./IPyth.sol";
+
+// This interface is forked from the Zerolend Adapter found here:
+// https://github.com/zerolend/pyth-oracles/blob/master/contracts/PythAggregatorV3.sol
+// Original license found under licenses/zerolend-pyth-oracles.md
+
+/**
+ * @title A port of the ChainlinkAggregatorV3 interface that supports Pyth price feeds
+ * @notice This does not store any roundId information on-chain. Please review the code before using this implementation.
+ * Users should deploy an instance of this contract to wrap every price feed id that they need to use.
+ */
+contract PythAggregatorV3 {
+    bytes32 public priceId;
+    IPyth public pyth;
+
+    constructor(address _pyth, bytes32 _priceId) {
+        priceId = _priceId;
+        pyth = IPyth(_pyth);
+    }
+
+    // Wrapper function to update the underlying Pyth price feeds. Not part of the AggregatorV3 interface but useful.
+    function updateFeeds(bytes[] calldata priceUpdateData) public payable {
+        // Update the prices to the latest available values and pay the required fee for it. The `priceUpdateData` data
+        // should be retrieved from our off-chain Price Service API using the `pyth-evm-js` package.
+        // See section "How Pyth Works on EVM Chains" below for more information.
+        uint fee = pyth.getUpdateFee(priceUpdateData);
+        pyth.updatePriceFeeds{value: fee}(priceUpdateData);
+
+        // refund remaining eth
+        payable(msg.sender).call{value: address(this).balance}("");
+    }
+
+    function decimals() public view virtual returns (uint8) {
+        PythStructs.Price memory price = pyth.getPriceUnsafe(priceId);
+        return uint8(-1 * int8(price.expo));
+    }
+
+    function description() public pure returns (string memory) {
+        return "A port of a chainlink aggregator powered by pyth network feeds";
+    }
+
+    function version() public pure returns (uint256) {
+        return 1;
+    }
+
+    function latestAnswer() public view virtual returns (int256) {
+        PythStructs.Price memory price = pyth.getPriceUnsafe(priceId);
+        return int256(price.price);
+    }
+
+    function latestTimestamp() public view returns (uint256) {
+        PythStructs.Price memory price = pyth.getPriceUnsafe(priceId);
+        return price.publishTime;
+    }
+
+    function latestRound() public view returns (uint256) {
+        // use timestamp as the round id
+        return latestTimestamp();
+    }
+
+    function getAnswer(uint256) public view returns (int256) {
+        return latestAnswer();
+    }
+
+    function getTimestamp(uint256) external view returns (uint256) {
+        return latestTimestamp();
+    }
+
+    function getRoundData(
+        uint80 _roundId
+    )
+        external
+        view
+        returns (
+            uint80 roundId,
+            int256 answer,
+            uint256 startedAt,
+            uint256 updatedAt,
+            uint80 answeredInRound
+        )
+    {
+        PythStructs.Price memory price = pyth.getPriceUnsafe(priceId);
+        return (
+            _roundId,
+            int256(price.price),
+            price.publishTime,
+            price.publishTime,
+            _roundId
+        );
+    }
+
+    function latestRoundData()
+        external
+        view
+        returns (
+            uint80 roundId,
+            int256 answer,
+            uint256 startedAt,
+            uint256 updatedAt,
+            uint80 answeredInRound
+        )
+    {
+        PythStructs.Price memory price = pyth.getPriceUnsafe(priceId);
+        roundId = uint80(price.publishTime);
+        return (
+            roundId,
+            int256(price.price),
+            price.publishTime,
+            price.publishTime,
+            roundId
+        );
+    }
+}

target_chains/ethereum/sdk/solidity/PythAggregatorV3.sol

@@ -1,6 +1,6 @@
 {
   "name": "@pythnetwork/pyth-sdk-solidity",
-  "version": "3.0.0",
+  "version": "3.1.0",
   "description": "Read prices from the Pyth oracle",
   "repository": {
     "type": "git",