examples/quantum_randomness_oracle.py

"""
Quantum Randomness Oracle for Blockchain
Generates quantum randomness and feeds it to blockchain networks
"""

import asyncio
import hashlib
import time
from typing import Dict, Any, Optional
from dataclasses import dataclass
from web3 import Web3
import eth_account

from app.quantum.qrng import get_quantum_rng
from app.quantum.hardware_interface import get_quantum_hardware_manager
from app.quantum.commitment import compute_commitment


@dataclass
class RandomnessRequest:
    """Represents a randomness request from blockchain"""
    request_id: int
    requester: str
    fee_paid: int
    block_number: int
    deadline: int
    timestamp: float


class QuantumRandomnessOracle:
    """Quantum-powered randomness oracle for blockchain networks"""
    
    def __init__(self, blockchain_rpc_url: str, contract_address: str, private_key: str):
        self.web3 = Web3(Web3.HTTPProvider(blockchain_rpc_url))
        self.contract_address = contract_address
        self.account = eth_account.Account.from_key(private_key)
        
        # Quantum RNG instance
        self.qrng = get_quantum_rng()
        self.hw_manager = get_quantum_hardware_manager()
        
        # Active requests tracking
        self.pending_requests: Dict[int, RandomnessRequest] = {}
        
        # Oracle configuration
        self.fulfillment_gas_limit = 200000
        self.commit_reveal_delay = 2  # blocks delay for commit-reveal scheme
        
    async def start_oracle_service(self):
        """Start the oracle service to listen for requests and provide randomness"""
        print("Starting Quantum Randomness Oracle Service...")
        
        while True:
            try:
                # Check for new requests
                await self.process_new_requests()
                
                # Fulfill eligible requests
                await self.fulfill_requests()
                
                # Wait before next cycle
                await asyncio.sleep(15)  # Ethereum block time
                
            except Exception as e:
                print(f"Oracle service error: {e}")
                await asyncio.sleep(30)  # Wait longer on error
    
    async def process_new_requests(self):
        """Monitor blockchain for new randomness requests"""
        # In a real implementation, this would use event filters
        # For demo purposes, we'll simulate request detection
        
        # Simulate detecting a new request
        if len(self.pending_requests) < 5:  # Limit pending requests
            # Create a mock request (in reality, this comes from blockchain events)
            mock_request = RandomnessRequest(
                request_id=len(self.pending_requests),
                requester=self.account.address,
                fee_paid=100000000000000000,  # 0.1 ETH
                block_number=self.web3.eth.block_number,
                deadline=self.web3.eth.block_number + 100,
                timestamp=time.time()
            )
            self.pending_requests[mock_request.request_id] = mock_request
            print(f"Detected new randomness request: {mock_request.request_id}")
    
    async def fulfill_requests(self):
        """Generate and submit quantum randomness for pending requests"""
        for req_id, request in list(self.pending_requests.items()):
            if self.web3.eth.block_number >= request.deadline:
                print(f"Request {req_id} expired, removing from queue")
                del self.pending_requests[req_id]
                continue
            
            # Generate quantum randomness
            quantum_result = await self.qrng.generate_bytes(32, 16, "raw")
            randomness_bytes = quantum_result.data
            
            # Create commitment: keccak256(abi.encodePacked(uint256(randomness)))
            commitment = compute_commitment(randomness_bytes)
            
            # Submit to blockchain (in real implementation, this would be a transaction)
            success = await self.submit_randomness(
                req_id, 
                randomness_bytes, 
                commitment
            )
            
            if success:
                print(f"Successfully fulfilled request {req_id}")
                del self.pending_requests[req_id]
            else:
                print(f"Failed to fulfill request {req_id}, will retry")
    
    async def submit_randomness(self, request_id: int, randomness: bytes, commitment: bytes) -> bool:
        """Submit randomness to the blockchain contract"""
        try:
            # In a real implementation, this would create and send a transaction
            # For demo, we'll just simulate the submission
            
            print(f"Submitting randomness for request {request_id}")
            print(f"Randomness: 0x{randomness.hex()}")
            print(f"Commitment: 0x{commitment.hex()}")
            
            # Simulate transaction success
            return True
        except Exception as e:
            print(f"Error submitting randomness: {e}")
            return False
    
    async def get_quantum_randomness(self, num_bytes: int = 32) -> bytes:
        """Generate quantum randomness using quantum hardware"""
        quantum_result = await self.qrng.generate_bytes(num_bytes, 16, "raw")
        return quantum_result.data
    
    async def benchmark_performance(self) -> Dict[str, Any]:
        """Benchmark quantum randomness generation performance"""
        start_time = time.time()
        
        # Generate 100 samples of 32-byte randomness
        tasks = [self.qrng.generate_bytes(32, 16, "raw") for _ in range(100)]
        results = await asyncio.gather(*tasks)
        
        end_time = time.time()
        total_time = end_time - start_time
        
        # Calculate entropy quality
        total_entropy_bits = sum(r.entropy_bits for r in results)
        avg_entropy_bits = total_entropy_bits / len(results)
        
        return {
            "samples_generated": len(results),
            "total_time_seconds": round(total_time, 3),
            "throughput_samples_per_second": round(len(results) / total_time, 2),
            "average_entropy_bits_per_sample": avg_entropy_bits,
            "total_entropy_bits_generated": total_entropy_bits,
            "generation_time_per_sample_ms": round((total_time / len(results)) * 1000, 2)
        }


# Example usage
async def main():
    """Example usage of the Quantum Randomness Oracle"""
    print("Quantum Randomness Oracle Demo")
    print("=" * 40)
    
    # Initialize oracle (using mock values)
    oracle = QuantumRandomnessOracle(
        blockchain_rpc_url="https://sepolia.infura.io/v3/YOUR_PROJECT_ID",
        contract_address="0x...",
        private_key="YOUR_PRIVATE_KEY"
    )
    
    # Benchmark performance
    print("\nBenchmarking Quantum Randomness Generation...")
    benchmark = await oracle.benchmark_performance()
    
    print(f"Samples generated: {benchmark['samples_generated']}")
    print(f"Total time: {benchmark['total_time_seconds']}s")
    print(f"Throughput: {benchmark['throughput_samples_per_second']} samples/sec")
    print(f"Avg entropy: {benchmark['average_entropy_bits_per_sample']} bits/sample")
    print(f"Generation time: {benchmark['generation_time_per_sample_ms']} ms/sample")
    
    # Generate sample randomness
    print("\nGenerating sample quantum randomness...")
    randomness = await oracle.get_quantum_randomness(32)
    print(f"Quantum randomness (32 bytes): 0x{randomness.hex()}")
    
    # Verify uniqueness by generating multiple samples
    print("\nVerifying randomness uniqueness...")
    samples = []
    for i in range(5):
        sample = await oracle.get_quantum_randomness(16)  # 16 bytes
        samples.append(sample.hex())
    
    unique_samples = len(set(samples))
    print(f"Generated {len(samples)} samples, {unique_samples} unique (all should be unique)")
    
    for i, sample in enumerate(samples):
        print(f"  Sample {i+1}: {sample}")


if __name__ == "__main__":
    asyncio.run(main())