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def unlock(self, key: str) -> str | None: # First, check if the key exists in the database at all. if key not in self.db and key not in self.locks: return "invalid_request" # If there is no lock on the key but it exists in the database, return None. if key not in self.locks: return None # Handle the lock release. current_lock = self.locks.pop(key, None) # If there are users waiting in the lock queue. if self.lock_queues.get(key): next_user = self.lock_queues[key].popleft() self.locks[key] = next_user # Transfer the lock to the next user return "released" # Lock was released and transferred to the next user # If the lock is released without any queue. return "released" # This case means the lock was released from the current user with no one to transfer
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