Create pi_network_module_3: Governance.sol

pi_network_smart_contract_architecture/pi_network_module_3: Governance.sol

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+pragma solidity ^0.8.0;
+
+import "./AccessControl.sol";
+
+contract Governance {
+    using AccessControl for address;
+
+    // Mapping of proposals
+    mapping (uint256 => Proposal) public proposals;
+
+    // Struct to represent a proposal
+    struct Proposal {
+        uint256 id;
+        address proposer;
+        string description;
+        uint256 voteCount;
+        bool executed;
+    }
+
+    // Event emitted when a new proposal is created
+    event NewProposal(uint256 indexed proposalId, address indexed proposer, string description);
+
+    // Event emitted when a user votes on a proposal
+    event Vote(uint256 indexed proposalId, address indexed voter, bool support);
+
+    // Event emitted when a proposal is executed
+    event ExecuteProposal(uint256 indexed proposalId);
+
+    // Function to propose a new change to the Pi Network
+    function propose(string memory _description) public onlyDeveloper {
+        uint256 proposalId = uint256(keccak256(abi.encodePacked(block.timestamp, msg.sender)));
+        Proposal storage proposal = proposals[proposalId];
+        proposal.id = proposalId;
+        proposal.proposer = msg.sender;
+        proposal.description = _description;
+        proposal.voteCount = 0;
+        proposal.executed = false;
+        emit NewProposal(proposalId, msg.sender, _description);
+    }
+
+    // Function to vote on a proposal
+    function vote(uint256 _proposalId, bool _support) public {
+        Proposal storage proposal = proposals[_proposalId];
+        require(proposal.id != 0, "Proposal does not exist");
+        require(!proposal.executed, "Proposal has already been executed");
+        proposal.voteCount += 1;
+        emit Vote(_proposalId, msg.sender, _support);
+    }
+
+    // Function to execute a proposal that has received sufficient votes
+    function executeProposal(uint256 _proposalId) public onlyAdmin {
+        Proposal storage proposal = proposals[_proposalId];
+        require(proposal.id != 0, "Proposal does not exist");
+        require(!proposal.executed, "Proposal has already been executed");
+        require(proposal.voteCount > 50, "Proposal has not received sufficient votes");
+        proposal.executed = true;
+        emit ExecuteProposal(_proposalId);
+        // Execute the proposal logic here
+        // ...
+    }
+}