""" Contract Upgrade System Handles safe contract versioning and upgrade mechanisms """ import asyncio import time import json from typing import Dict, List, Optional, Tuple, Set from dataclasses import dataclass from enum import Enum from decimal import Decimal class UpgradeStatus(Enum): PROPOSED = "proposed" APPROVED = "approved" REJECTED = "rejected" EXECUTED = "executed" FAILED = "failed" ROLLED_BACK = "rolled_back" class UpgradeType(Enum): PARAMETER_CHANGE = "parameter_change" LOGIC_UPDATE = "logic_update" SECURITY_PATCH = "security_patch" FEATURE_ADDITION = "feature_addition" EMERGENCY_FIX = "emergency_fix" @dataclass class ContractVersion: version: str address: str deployed_at: float total_contracts: int total_value: Decimal is_active: bool metadata: Dict @dataclass class UpgradeProposal: proposal_id: str contract_type: str current_version: str new_version: str upgrade_type: UpgradeType description: str changes: Dict voting_deadline: float execution_deadline: float status: UpgradeStatus votes: Dict[str, bool] total_votes: int yes_votes: int no_votes: int required_approval: float created_at: float proposer: str executed_at: Optional[float] rollback_data: Optional[Dict] class ContractUpgradeManager: """Manages contract upgrades and versioning""" def __init__(self): self.contract_versions: Dict[str, List[ContractVersion]] = {} # contract_type -> versions self.active_versions: Dict[str, str] = {} # contract_type -> active version self.upgrade_proposals: Dict[str, UpgradeProposal] = {} self.upgrade_history: List[Dict] = [] # Upgrade parameters self.min_voting_period = 86400 * 3 # 3 days self.max_voting_period = 86400 * 7 # 7 days self.required_approval_rate = 0.6 # 60% approval required self.min_participation_rate = 0.3 # 30% minimum participation self.emergency_upgrade_threshold = 0.8 # 80% for emergency upgrades self.rollback_timeout = 86400 * 7 # 7 days to rollback # Governance self.governance_addresses: Set[str] = set() self.stake_weights: Dict[str, Decimal] = {} # Initialize governance self._initialize_governance() def _initialize_governance(self): """Initialize governance addresses""" # In real implementation, this would load from blockchain state # For now, use default governance addresses governance_addresses = [ "0xgovernance1111111111111111111111111111111111111", "0xgovernance2222222222222222222222222222222222222", "0xgovernance3333333333333333333333333333333333333" ] for address in governance_addresses: self.governance_addresses.add(address) self.stake_weights[address] = Decimal('1000') # Equal stake weights initially async def propose_upgrade(self, contract_type: str, current_version: str, new_version: str, upgrade_type: UpgradeType, description: str, changes: Dict, proposer: str, emergency: bool = False) -> Tuple[bool, str, Optional[str]]: """Propose contract upgrade""" try: # Validate inputs if not all([contract_type, current_version, new_version, description, changes, proposer]): return False, "Missing required fields", None # Check proposer authority if proposer not in self.governance_addresses: return False, "Proposer not authorized", None # Check current version active_version = self.active_versions.get(contract_type) if active_version != current_version: return False, f"Current version mismatch. Active: {active_version}, Proposed: {current_version}", None # Validate new version format if not self._validate_version_format(new_version): return False, "Invalid version format", None # Check for existing proposal for proposal in self.upgrade_proposals.values(): if (proposal.contract_type == contract_type and proposal.new_version == new_version and proposal.status in [UpgradeStatus.PROPOSED, UpgradeStatus.APPROVED]): return False, "Proposal for this version already exists", None # Generate proposal ID proposal_id = self._generate_proposal_id(contract_type, new_version) # Set voting deadlines current_time = time.time() voting_period = self.min_voting_period if not emergency else self.min_voting_period // 2 voting_deadline = current_time + voting_period execution_deadline = voting_deadline + 86400 # 1 day after voting # Set required approval rate required_approval = self.emergency_upgrade_threshold if emergency else self.required_approval_rate # Create proposal proposal = UpgradeProposal( proposal_id=proposal_id, contract_type=contract_type, current_version=current_version, new_version=new_version, upgrade_type=upgrade_type, description=description, changes=changes, voting_deadline=voting_deadline, execution_deadline=execution_deadline, status=UpgradeStatus.PROPOSED, votes={}, total_votes=0, yes_votes=0, no_votes=0, required_approval=required_approval, created_at=current_time, proposer=proposer, executed_at=None, rollback_data=None ) self.upgrade_proposals[proposal_id] = proposal # Start voting process asyncio.create_task(self._manage_voting_process(proposal_id)) log_info(f"Upgrade proposal created: {proposal_id} - {contract_type} {current_version} -> {new_version}") return True, "Upgrade proposal created successfully", proposal_id except Exception as e: return False, f"Failed to create proposal: {str(e)}", None def _validate_version_format(self, version: str) -> bool: """Validate semantic version format""" try: parts = version.split('.') if len(parts) != 3: return False major, minor, patch = parts int(major) and int(minor) and int(patch) return True except ValueError: return False def _generate_proposal_id(self, contract_type: str, new_version: str) -> str: """Generate unique proposal ID""" import hashlib content = f"{contract_type}:{new_version}:{time.time()}" return hashlib.sha256(content.encode()).hexdigest()[:12] async def _manage_voting_process(self, proposal_id: str): """Manage voting process for proposal""" proposal = self.upgrade_proposals.get(proposal_id) if not proposal: return try: # Wait for voting deadline await asyncio.sleep(proposal.voting_deadline - time.time()) # Check voting results await self._finalize_voting(proposal_id) except Exception as e: log_error(f"Error in voting process for {proposal_id}: {e}") proposal.status = UpgradeStatus.FAILED async def _finalize_voting(self, proposal_id: str): """Finalize voting and determine outcome""" proposal = self.upgrade_proposals[proposal_id] # Calculate voting results total_stake = sum(self.stake_weights.get(voter, Decimal('0')) for voter in proposal.votes.keys()) yes_stake = sum(self.stake_weights.get(voter, Decimal('0')) for voter, vote in proposal.votes.items() if vote) # Check minimum participation total_governance_stake = sum(self.stake_weights.values()) participation_rate = float(total_stake / total_governance_stake) if total_governance_stake > 0 else 0 if participation_rate < self.min_participation_rate: proposal.status = UpgradeStatus.REJECTED log_info(f"Proposal {proposal_id} rejected due to low participation: {participation_rate:.2%}") return # Check approval rate approval_rate = float(yes_stake / total_stake) if total_stake > 0 else 0 if approval_rate >= proposal.required_approval: proposal.status = UpgradeStatus.APPROVED log_info(f"Proposal {proposal_id} approved with {approval_rate:.2%} approval") # Schedule execution asyncio.create_task(self._execute_upgrade(proposal_id)) else: proposal.status = UpgradeStatus.REJECTED log_info(f"Proposal {proposal_id} rejected with {approval_rate:.2%} approval") async def vote_on_proposal(self, proposal_id: str, voter_address: str, vote: bool) -> Tuple[bool, str]: """Cast vote on upgrade proposal""" proposal = self.upgrade_proposals.get(proposal_id) if not proposal: return False, "Proposal not found" # Check voting authority if voter_address not in self.governance_addresses: return False, "Not authorized to vote" # Check voting period if time.time() > proposal.voting_deadline: return False, "Voting period has ended" # Check if already voted if voter_address in proposal.votes: return False, "Already voted" # Cast vote proposal.votes[voter_address] = vote proposal.total_votes += 1 if vote: proposal.yes_votes += 1 else: proposal.no_votes += 1 log_info(f"Vote cast on proposal {proposal_id} by {voter_address}: {'YES' if vote else 'NO'}") return True, "Vote cast successfully" async def _execute_upgrade(self, proposal_id: str): """Execute approved upgrade""" proposal = self.upgrade_proposals[proposal_id] try: # Wait for execution deadline await asyncio.sleep(proposal.execution_deadline - time.time()) # Check if still approved if proposal.status != UpgradeStatus.APPROVED: return # Prepare rollback data rollback_data = await self._prepare_rollback_data(proposal) # Execute upgrade success = await self._perform_upgrade(proposal) if success: proposal.status = UpgradeStatus.EXECUTED proposal.executed_at = time.time() proposal.rollback_data = rollback_data # Update active version self.active_versions[proposal.contract_type] = proposal.new_version # Record in history self.upgrade_history.append({ 'proposal_id': proposal_id, 'contract_type': proposal.contract_type, 'from_version': proposal.current_version, 'to_version': proposal.new_version, 'executed_at': proposal.executed_at, 'upgrade_type': proposal.upgrade_type.value }) log_info(f"Upgrade executed: {proposal_id} - {proposal.contract_type} {proposal.current_version} -> {proposal.new_version}") # Start rollback window asyncio.create_task(self._manage_rollback_window(proposal_id)) else: proposal.status = UpgradeStatus.FAILED log_error(f"Upgrade execution failed: {proposal_id}") except Exception as e: proposal.status = UpgradeStatus.FAILED log_error(f"Error executing upgrade {proposal_id}: {e}") async def _prepare_rollback_data(self, proposal: UpgradeProposal) -> Dict: """Prepare data for potential rollback""" return { 'previous_version': proposal.current_version, 'contract_state': {}, # Would capture current contract state 'migration_data': {}, # Would store migration data 'timestamp': time.time() } async def _perform_upgrade(self, proposal: UpgradeProposal) -> bool: """Perform the actual upgrade""" try: # In real implementation, this would: # 1. Deploy new contract version # 2. Migrate state from old contract # 3. Update contract references # 4. Verify upgrade integrity # Simulate upgrade process await asyncio.sleep(10) # Simulate upgrade time # Create new version record new_version = ContractVersion( version=proposal.new_version, address=f"0x{proposal.contract_type}_{proposal.new_version}", # New address deployed_at=time.time(), total_contracts=0, total_value=Decimal('0'), is_active=True, metadata={ 'upgrade_type': proposal.upgrade_type.value, 'proposal_id': proposal.proposal_id, 'changes': proposal.changes } ) # Add to version history if proposal.contract_type not in self.contract_versions: self.contract_versions[proposal.contract_type] = [] # Deactivate old version for version in self.contract_versions[proposal.contract_type]: if version.version == proposal.current_version: version.is_active = False break # Add new version self.contract_versions[proposal.contract_type].append(new_version) return True except Exception as e: log_error(f"Upgrade execution error: {e}") return False async def _manage_rollback_window(self, proposal_id: str): """Manage rollback window after upgrade""" proposal = self.upgrade_proposals[proposal_id] try: # Wait for rollback timeout await asyncio.sleep(self.rollback_timeout) # Check if rollback was requested if proposal.status == UpgradeStatus.EXECUTED: # No rollback requested, finalize upgrade await self._finalize_upgrade(proposal_id) except Exception as e: log_error(f"Error in rollback window for {proposal_id}: {e}") async def _finalize_upgrade(self, proposal_id: str): """Finalize upgrade after rollback window""" proposal = self.upgrade_proposals[proposal_id] # Clear rollback data to save space proposal.rollback_data = None log_info(f"Upgrade finalized: {proposal_id}") async def rollback_upgrade(self, proposal_id: str, reason: str) -> Tuple[bool, str]: """Rollback upgrade to previous version""" proposal = self.upgrade_proposals.get(proposal_id) if not proposal: return False, "Proposal not found" if proposal.status != UpgradeStatus.EXECUTED: return False, "Can only rollback executed upgrades" if not proposal.rollback_data: return False, "Rollback data not available" # Check rollback window if time.time() - proposal.executed_at > self.rollback_timeout: return False, "Rollback window has expired" try: # Perform rollback success = await self._perform_rollback(proposal) if success: proposal.status = UpgradeStatus.ROLLED_BACK # Restore previous version self.active_versions[proposal.contract_type] = proposal.current_version # Update version records for version in self.contract_versions[proposal.contract_type]: if version.version == proposal.new_version: version.is_active = False elif version.version == proposal.current_version: version.is_active = True log_info(f"Upgrade rolled back: {proposal_id} - Reason: {reason}") return True, "Rollback successful" else: return False, "Rollback execution failed" except Exception as e: log_error(f"Rollback error for {proposal_id}: {e}") return False, f"Rollback failed: {str(e)}" async def _perform_rollback(self, proposal: UpgradeProposal) -> bool: """Perform the actual rollback""" try: # In real implementation, this would: # 1. Restore previous contract state # 2. Update contract references back # 3. Verify rollback integrity # Simulate rollback process await asyncio.sleep(5) # Simulate rollback time return True except Exception as e: log_error(f"Rollback execution error: {e}") return False async def get_proposal(self, proposal_id: str) -> Optional[UpgradeProposal]: """Get upgrade proposal""" return self.upgrade_proposals.get(proposal_id) async def get_proposals_by_status(self, status: UpgradeStatus) -> List[UpgradeProposal]: """Get proposals by status""" return [ proposal for proposal in self.upgrade_proposals.values() if proposal.status == status ] async def get_contract_versions(self, contract_type: str) -> List[ContractVersion]: """Get all versions for a contract type""" return self.contract_versions.get(contract_type, []) async def get_active_version(self, contract_type: str) -> Optional[str]: """Get active version for contract type""" return self.active_versions.get(contract_type) async def get_upgrade_statistics(self) -> Dict: """Get upgrade system statistics""" total_proposals = len(self.upgrade_proposals) if total_proposals == 0: return { 'total_proposals': 0, 'status_distribution': {}, 'upgrade_types': {}, 'average_execution_time': 0, 'success_rate': 0 } # Status distribution status_counts = {} for proposal in self.upgrade_proposals.values(): status = proposal.status.value status_counts[status] = status_counts.get(status, 0) + 1 # Upgrade type distribution type_counts = {} for proposal in self.upgrade_proposals.values(): up_type = proposal.upgrade_type.value type_counts[up_type] = type_counts.get(up_type, 0) + 1 # Execution statistics executed_proposals = [ proposal for proposal in self.upgrade_proposals.values() if proposal.status == UpgradeStatus.EXECUTED ] if executed_proposals: execution_times = [ proposal.executed_at - proposal.created_at for proposal in executed_proposals if proposal.executed_at ] avg_execution_time = sum(execution_times) / len(execution_times) if execution_times else 0 else: avg_execution_time = 0 # Success rate successful_upgrades = len(executed_proposals) success_rate = successful_upgrades / total_proposals if total_proposals > 0 else 0 return { 'total_proposals': total_proposals, 'status_distribution': status_counts, 'upgrade_types': type_counts, 'average_execution_time': avg_execution_time, 'success_rate': success_rate, 'total_governance_addresses': len(self.governance_addresses), 'contract_types': len(self.contract_versions) } # Global upgrade manager upgrade_manager: Optional[ContractUpgradeManager] = None def get_upgrade_manager() -> Optional[ContractUpgradeManager]: """Get global upgrade manager""" return upgrade_manager def create_upgrade_manager() -> ContractUpgradeManager: """Create and set global upgrade manager""" global upgrade_manager upgrade_manager = ContractUpgradeManager() return upgrade_manager