Create PIOrderBook.sol

blockchain_integration/pi_network/defi_integration/contracts/PIOrderBook.sol

@@ -0,0 +1,37 @@
+pragma solidity ^0.8.0;
+
+import "https://github.com/OpenZeppelin/openzeppelin-solidity/contracts/math/SafeMath.sol";
+import "https://github.com/OpenZeppelin/openzeppelin-solidity/contracts/token/ERC20/SafeERC20.sol";
+
+contract PIOrderBook {
+    using SafeMath for uint256;
+    using SafeERC20 for ERC20;
+
+    // Mapping of user addresses to their orders
+    mapping (address => Order[]) public orders;
+
+    // Event emitted when a new order is placed
+    event OrderPlaced(address user, uint256 amount, uint256 price, bool isBuy);
+
+    // Function to place a new order
+    function placeOrder(uint256 amount, uint256 price, bool isBuy) public {
+        require(amount > 0, "Invalid order amount");
+        require(price > 0, "Invalid order price");
+        Order memory newOrder = Order(msg.sender, amount, price, isBuy);
+        orders[msg.sender].push(newOrder);
+        emit OrderPlaced(msg.sender, amount, price, isBuy);
+    }
+
+    // Function to match and execute trades
+    function matchAndExecuteTrades() internal {
+        // Implement order matching and trade execution logic here
+    }
+
+    // Struct to represent an order
+    struct Order {
+        address user;
+        uint256 amount;
+        uint256 price;
+        bool isBuy;
+    }
+}