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| """Ledger adapters for external blockchain backends like Hyperledger/OmniSeal.""" | |
| import json | |
| from abc import ABC, abstractmethod | |
| from typing import Any, Dict, List, Optional | |
| from datetime import datetime | |
| from fastmcp.utilities.logging import get_logger | |
| logger = get_logger(__name__) | |
| class LedgerAdapter(ABC): | |
| """Abstract base class for ledger adapters.""" | |
| async def submit_block(self, block_data: Dict[str, Any]) -> str: | |
| """Submit a block to the external ledger. | |
| Args: | |
| block_data: The block data to submit | |
| Returns: | |
| Transaction ID or block hash from the external ledger | |
| """ | |
| pass | |
| async def verify_block(self, block_id: str) -> bool: | |
| """Verify a block exists and is valid on the external ledger. | |
| Args: | |
| block_id: The block ID to verify | |
| Returns: | |
| True if block is valid, False otherwise | |
| """ | |
| pass | |
| async def get_block_proof(self, block_id: str) -> Optional[Dict[str, Any]]: | |
| """Get a proof of block existence from the external ledger. | |
| Args: | |
| block_id: The block ID to get proof for | |
| Returns: | |
| Proof data or None if not found | |
| """ | |
| pass | |
| class HyperledgerAdapter(LedgerAdapter): | |
| """Adapter for Hyperledger Fabric blockchain backend.""" | |
| def __init__(self, | |
| network_config: str, | |
| channel_name: str = "mcp-channel", | |
| chaincode_name: str = "provenance-ledger", | |
| peer_endpoint: str = "localhost:7051", | |
| orderer_endpoint: str = "localhost:7050"): | |
| """Initialize Hyperledger adapter. | |
| Args: | |
| network_config: Path to network configuration file | |
| channel_name: Name of the Hyperledger channel | |
| chaincode_name: Name of the deployed chaincode | |
| peer_endpoint: Peer endpoint URL | |
| orderer_endpoint: Orderer endpoint URL | |
| """ | |
| self.network_config = network_config | |
| self.channel_name = channel_name | |
| self.chaincode_name = chaincode_name | |
| self.peer_endpoint = peer_endpoint | |
| self.orderer_endpoint = orderer_endpoint | |
| self._client = None | |
| async def _get_client(self): | |
| """Get or create Hyperledger client.""" | |
| if self._client is None: | |
| try: | |
| # This would import the actual Hyperledger Fabric SDK | |
| # from hfc.fabric import Client | |
| # self._client = Client(net_profile=self.network_config) | |
| logger.info("Hyperledger client initialized (stub implementation)") | |
| self._client = "stub_client" | |
| except ImportError: | |
| logger.warning("Hyperledger Fabric SDK not available, using stub implementation") | |
| self._client = "stub_client" | |
| return self._client | |
| async def submit_block(self, block_data: Dict[str, Any]) -> str: | |
| """Submit a block to Hyperledger Fabric. | |
| Args: | |
| block_data: The block data to submit | |
| Returns: | |
| Transaction ID from Hyperledger | |
| """ | |
| try: | |
| client = await self._get_client() | |
| # Prepare transaction data | |
| transaction_data = { | |
| "block_number": block_data.get("block_number"), | |
| "merkle_root": block_data.get("merkle_root"), | |
| "entry_count": block_data.get("entry_count"), | |
| "timestamp": datetime.utcnow().isoformat(), | |
| "entries": block_data.get("entries", []) | |
| } | |
| # In a real implementation, this would: | |
| # 1. Create a transaction proposal | |
| # 2. Send it to endorsing peers | |
| # 3. Submit to ordering service | |
| # 4. Return transaction ID | |
| # Stub implementation | |
| import hashlib | |
| tx_data = json.dumps(transaction_data, sort_keys=True) | |
| tx_id = hashlib.sha256(tx_data.encode()).hexdigest() | |
| logger.info(f"Submitted block {block_data.get('block_number')} to Hyperledger (tx: {tx_id})") | |
| return tx_id | |
| except Exception as e: | |
| logger.error(f"Failed to submit block to Hyperledger: {e}") | |
| raise | |
| async def verify_block(self, block_id: str) -> bool: | |
| """Verify a block exists on Hyperledger Fabric. | |
| Args: | |
| block_id: The block ID to verify | |
| Returns: | |
| True if block is valid, False otherwise | |
| """ | |
| try: | |
| client = await self._get_client() | |
| # In a real implementation, this would: | |
| # 1. Query the blockchain for the block | |
| # 2. Verify the block structure | |
| # 3. Check block signatures | |
| # Stub implementation - always return True for demo | |
| logger.info(f"Verified block {block_id} on Hyperledger") | |
| return True | |
| except Exception as e: | |
| logger.error(f"Failed to verify block {block_id}: {e}") | |
| return False | |
| async def get_block_proof(self, block_id: str) -> Optional[Dict[str, Any]]: | |
| """Get a proof of block existence from Hyperledger Fabric. | |
| Args: | |
| block_id: The block ID to get proof for | |
| Returns: | |
| Proof data or None if not found | |
| """ | |
| try: | |
| client = await self._get_client() | |
| # In a real implementation, this would: | |
| # 1. Query the blockchain for block details | |
| # 2. Get block header and signatures | |
| # 3. Return proof data | |
| # Stub implementation | |
| proof_data = { | |
| "block_id": block_id, | |
| "block_hash": f"hyperledger_hash_{block_id}", | |
| "block_number": int(block_id.split('_')[-1]) if '_' in block_id else 0, | |
| "timestamp": datetime.utcnow().isoformat(), | |
| "proof_type": "hyperledger_fabric", | |
| "signatures": ["peer1_signature", "peer2_signature"], | |
| "merkle_root": f"merkle_root_{block_id}" | |
| } | |
| logger.info(f"Retrieved block proof for {block_id} from Hyperledger") | |
| return proof_data | |
| except Exception as e: | |
| logger.error(f"Failed to get block proof for {block_id}: {e}") | |
| return None | |
| class OmniSealAdapter(LedgerAdapter): | |
| """Adapter for OmniSeal blockchain backend.""" | |
| def __init__(self, | |
| api_endpoint: str = "https://api.omniseal.com", | |
| api_key: str = None, | |
| network_id: str = "mainnet"): | |
| """Initialize OmniSeal adapter. | |
| Args: | |
| api_endpoint: OmniSeal API endpoint | |
| api_key: API key for authentication | |
| network_id: Network ID to use | |
| """ | |
| self.api_endpoint = api_endpoint | |
| self.api_key = api_key | |
| self.network_id = network_id | |
| self._session = None | |
| async def _get_session(self): | |
| """Get or create HTTP session.""" | |
| if self._session is None: | |
| try: | |
| import aiohttp | |
| headers = {} | |
| if self.api_key: | |
| headers["Authorization"] = f"Bearer {self.api_key}" | |
| self._session = aiohttp.ClientSession( | |
| base_url=self.api_endpoint, | |
| headers=headers | |
| ) | |
| except ImportError: | |
| logger.warning("aiohttp not available, using stub implementation") | |
| self._session = "stub_session" | |
| return self._session | |
| async def submit_block(self, block_data: Dict[str, Any]) -> str: | |
| """Submit a block to OmniSeal. | |
| Args: | |
| block_data: The block data to submit | |
| Returns: | |
| Transaction ID from OmniSeal | |
| """ | |
| try: | |
| session = await self._get_session() | |
| # Prepare submission data | |
| submission_data = { | |
| "network_id": self.network_id, | |
| "block_data": block_data, | |
| "timestamp": datetime.utcnow().isoformat() | |
| } | |
| # In a real implementation, this would: | |
| # 1. Send POST request to OmniSeal API | |
| # 2. Handle response and errors | |
| # 3. Return transaction ID | |
| # Stub implementation | |
| import hashlib | |
| tx_data = json.dumps(submission_data, sort_keys=True) | |
| tx_id = hashlib.sha256(tx_data.encode()).hexdigest() | |
| logger.info(f"Submitted block {block_data.get('block_number')} to OmniSeal (tx: {tx_id})") | |
| return tx_id | |
| except Exception as e: | |
| logger.error(f"Failed to submit block to OmniSeal: {e}") | |
| raise | |
| async def verify_block(self, block_id: str) -> bool: | |
| """Verify a block exists on OmniSeal. | |
| Args: | |
| block_id: The block ID to verify | |
| Returns: | |
| True if block is valid, False otherwise | |
| """ | |
| try: | |
| session = await self._get_session() | |
| # In a real implementation, this would: | |
| # 1. Send GET request to OmniSeal API | |
| # 2. Check response status | |
| # 3. Verify block data | |
| # Stub implementation | |
| logger.info(f"Verified block {block_id} on OmniSeal") | |
| return True | |
| except Exception as e: | |
| logger.error(f"Failed to verify block {block_id}: {e}") | |
| return False | |
| async def get_block_proof(self, block_id: str) -> Optional[Dict[str, Any]]: | |
| """Get a proof of block existence from OmniSeal. | |
| Args: | |
| block_id: The block ID to get proof for | |
| Returns: | |
| Proof data or None if not found | |
| """ | |
| try: | |
| session = await self._get_session() | |
| # In a real implementation, this would: | |
| # 1. Send GET request to OmniSeal API | |
| # 2. Parse response data | |
| # 3. Return proof information | |
| # Stub implementation | |
| proof_data = { | |
| "block_id": block_id, | |
| "block_hash": f"omniseal_hash_{block_id}", | |
| "block_number": int(block_id.split('_')[-1]) if '_' in block_id else 0, | |
| "timestamp": datetime.utcnow().isoformat(), | |
| "proof_type": "omniseal", | |
| "network_id": self.network_id, | |
| "merkle_root": f"merkle_root_{block_id}" | |
| } | |
| logger.info(f"Retrieved block proof for {block_id} from OmniSeal") | |
| return proof_data | |
| except Exception as e: | |
| logger.error(f"Failed to get block proof for {block_id}: {e}") | |
| return None | |
| class StubAdapter(LedgerAdapter): | |
| """Stub adapter for testing and development.""" | |
| def __init__(self): | |
| """Initialize stub adapter.""" | |
| self.submitted_blocks = {} | |
| self.block_proofs = {} | |
| async def submit_block(self, block_data: Dict[str, Any]) -> str: | |
| """Submit a block to the stub storage. | |
| Args: | |
| block_data: The block data to submit | |
| Returns: | |
| Generated block ID | |
| """ | |
| import hashlib | |
| block_id = f"stub_block_{len(self.submitted_blocks) + 1}" | |
| self.submitted_blocks[block_id] = block_data | |
| logger.info(f"Submitted block {block_data.get('block_number')} to stub storage (id: {block_id})") | |
| return block_id | |
| async def verify_block(self, block_id: str) -> bool: | |
| """Verify a block exists in stub storage. | |
| Args: | |
| block_id: The block ID to verify | |
| Returns: | |
| True if block exists, False otherwise | |
| """ | |
| exists = block_id in self.submitted_blocks | |
| logger.info(f"Verified block {block_id} in stub storage: {exists}") | |
| return exists | |
| async def get_block_proof(self, block_id: str) -> Optional[Dict[str, Any]]: | |
| """Get a proof of block existence from stub storage. | |
| Args: | |
| block_id: The block ID to get proof for | |
| Returns: | |
| Proof data or None if not found | |
| """ | |
| if block_id not in self.submitted_blocks: | |
| return None | |
| block_data = self.submitted_blocks[block_id] | |
| proof_data = { | |
| "block_id": block_id, | |
| "block_hash": f"stub_hash_{block_id}", | |
| "block_number": block_data.get("block_number", 0), | |
| "timestamp": datetime.utcnow().isoformat(), | |
| "proof_type": "stub", | |
| "merkle_root": block_data.get("merkle_root", "") | |
| } | |
| logger.info(f"Retrieved block proof for {block_id} from stub storage") | |
| return proof_data | |