Create consensus.py

QuantumNexusProtocol/src/core/consensus.py

@@ -0,0 +1,83 @@
+import hashlib
+import time
+from collections import defaultdict
+
+class Block:
+    def __init__(self, index, previous_hash, transactions, timestamp=None):
+        self.index = index
+        self.previous_hash = previous_hash
+        self.transactions = transactions
+        self.timestamp = timestamp or time.time()
+        self.hash = self.calculate_hash()
+
+    def calculate_hash(self):
+        block_string = f"{self.index}{self.previous_hash}{self.transactions}{self.timestamp}".encode()
+        return hashlib.sha256(block_string).hexdigest()
+
+class ConsensusAlgorithm:
+    def __init__(self):
+        self.validators = {}
+        self.current_block = None
+        self.pending_transactions = []
+        self.validator_rewards = defaultdict(int)
+        self.slashing_conditions = {}
+
+    def register_validator(self, validator_id, stake):
+        self.validators[validator_id] = stake
+
+    def propose_block(self, transactions):
+        if not self.validators:
+            raise Exception("No validators registered.")
+
+        self.current_block = Block(
+            index=len(self.pending_transactions) + 1,
+            previous_hash=self.get_last_block_hash(),
+            transactions=transactions
+        )
+        return self.current_block
+
+    def validate_block(self, block):
+        # Validate block hash and structure
+        if block.hash != block.calculate_hash():
+            return False
+        if block.previous_hash != self.get_last_block_hash():
+            return False
+        return True
+
+    def finalize_block(self, block):
+        if self.validate_block(block):
+            self.pending_transactions.append(block)
+            self.reward_validators(block)
+            return True
+        return False
+
+    def reward_validators(self, block):
+        # Reward validators for proposing a valid block
+        for validator in self.validators:
+            self.validator_rewards[validator] += 1  # Simple reward mechanism
+
+    def get_last_block_hash(self):
+        return self.pending_transactions[-1].hash if self.pending_transactions else "0"
+
+    def handle_fork(self, competing_chain):
+        # Implement logic to handle forks in the blockchain
+        if len(competing_chain) > len(self.pending_transactions):
+            self.pending_transactions = competing_chain
+
+    def slash_validator(self, validator_id):
+        # Implement slashing conditions for malicious behavior
+        if validator_id in self.slashing_conditions:
+            # Deduct stake or impose penalties
+            self.validators[validator_id] = max(0, self.validators[validator_id] - self.slashing_conditions[validator_id])
+
+    def set_slashing_condition(self, validator_id, penalty):
+        self.slashing_conditions[validator_id] = penalty
+
+    def get_validator_rewards(self):
+        return self.validator_rewards
+
+    def get_pending_transactions(self):
+        return self.pending_transactions
+
+    def get_validators(self):
+        return self.validators