From 9457b781c54ae2f5ce0033f32f25d759026449d7 Mon Sep 17 00:00:00 2001
From: Haythem Sellami <sellamihaythem96@gmail.com>
Date: Fri, 23 Jun 2023 09:00:51 +0700
Subject: [PATCH] stable pricer

---
 contracts/pricers/ChainlinkStablePricer.sol | 54 +++++++++++++++++++++
 scripts/deployChainlinkStablePricer.js      | 32 ++++++++++++
 truffle-config.js                           | 12 ++++-
 3 files changed, 96 insertions(+), 2 deletions(-)
 create mode 100644 contracts/pricers/ChainlinkStablePricer.sol
 create mode 100644 scripts/deployChainlinkStablePricer.js

diff --git a/contracts/pricers/ChainlinkStablePricer.sol b/contracts/pricers/ChainlinkStablePricer.sol
new file mode 100644
index 000000000..b4de0e7a5
--- /dev/null
+++ b/contracts/pricers/ChainlinkStablePricer.sol
@@ -0,0 +1,54 @@
+// SPDX-License-Identifier: UNLICENSED
+pragma solidity 0.6.10;
+
+import {OracleInterface} from "../interfaces/OracleInterface.sol";
+import {OpynPricerInterface} from "../interfaces/OpynPricerInterface.sol";
+
+/**
+ * @notice A Pricer contract to push stable USDC price (1:1 to USD)
+ */
+contract ChainlinkStablePricer is OpynPricerInterface {
+    /// @notice the opyn oracle address
+    OracleInterface public oracle;
+
+    /// @notice asset that this pricer will a get price for
+    address public asset;
+
+    /**
+     * @param _asset asset that this pricer will get a price for
+     * @param _oracle Opyn Oracle address
+     */
+    constructor(address _asset, address _oracle) public {
+        require(_oracle != address(0), "ChainLinkPricer: Cannot set 0 address as oracle");
+
+        oracle = OracleInterface(_oracle);
+        asset = _asset;
+    }
+
+    /**
+     * @notice set the expiry price in the oracle, always 1e8
+     * @param _expiryTimestamp expiry to set a price for
+     */
+    function setExpiryPriceInOracle(uint256 _expiryTimestamp) external {
+        oracle.setExpiryPrice(asset, _expiryTimestamp, uint256(1e8));
+    }
+
+    /**
+     * @notice get the live price for the asset
+     * @dev overides the getPrice function in OpynPricerInterface
+     * @return price of the asset in USD, scaled by 1e8
+     */
+    function getPrice() external view override returns (uint256) {
+        return uint256(1e8);
+    }
+
+    /**
+     * @notice get historical USDC price (always 1e8)
+     * @return round price and timestamp
+     */
+    function getHistoricalPrice(
+        uint80 /*_roundId*/
+    ) external view override returns (uint256, uint256) {
+        return ((uint256(1e8)), block.timestamp);
+    }
+}
diff --git a/scripts/deployChainlinkStablePricer.js b/scripts/deployChainlinkStablePricer.js
new file mode 100644
index 000000000..b90d37fb3
--- /dev/null
+++ b/scripts/deployChainlinkStablePricer.js
@@ -0,0 +1,32 @@
+const yargs = require('yargs')
+
+const ChainlinkStablePricer = artifacts.require('ChainlinkStablePricer.sol')
+
+module.exports = async function(callback) {
+  try {
+    const options = yargs
+      .usage(
+        'Usage: --network <network> --asset <asset> --oracle <oracle> --gasPrice <gasPrice> --gasLimit <gasLimit>',
+      )
+      .option('network', {describe: 'Network name', type: 'string', demandOption: true})
+      .option('asset', {describe: 'Asset address', type: 'string', demandOption: true})
+      .option('oracle', {describe: 'Oracle module address', type: 'string', demandOption: true})
+      .option('gasPrice', {describe: 'Gas price in WEI', type: 'string', demandOption: false})
+      .option('gasLimit', {describe: 'Gas Limit in WEI', type: 'string', demandOption: false}).argv
+
+    console.log(`Deploying chainlink pricer contract on ${options.network} 🍕`)
+
+    const tx = await ChainlinkStablePricer.new(options.asset, options.oracle, {
+      gasPrice: options.gasPrice,
+      gas: options.gasLimit,
+    })
+
+    console.log('Chainlink pricer deployed! 🎉')
+    console.log(`Transaction hash: ${tx.transactionHash}`)
+    console.log(`Deployed contract address: ${tx.address}`)
+
+    callback()
+  } catch (err) {
+    callback(err)
+  }
+}
diff --git a/truffle-config.js b/truffle-config.js
index eca765019..2f2ff4572 100644
--- a/truffle-config.js
+++ b/truffle-config.js
@@ -63,7 +63,7 @@ module.exports = {
       gasPrice: 25000000000,
     },
     avax: {
-      provider: () => new HDWalletProvider(mnemonic, 'https://api.avax.network/ext/bc/C/rpc'),
+      provider: () => new HDWalletProvider(mnemonic, `https://avalanche-mainnet.infura.io/v3/${key}`),
       network_id: 1,
     },
     fuji: {
@@ -72,7 +72,15 @@ module.exports = {
       gas: 8000000,
       gasPrice: 250000000000,
       skipDryRun: true,
-    }
+    },
+    matic: {
+      provider: () => new HDWalletProvider(mnemonic, `https://polygon-mainnet.infura.io/v3/${key}`),
+      network_id: 137,
+      confirmations: 2,
+      timeoutBlocks: 200,
+      skipDryRun: true
+    },
+
   },
 
   mocha: {