You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: packet_filter.rs
    path of file: ./repos/readyset/readyset-dataflow/src/node/special
    
    the code of the file until where you have to start completion: use std::collections::hash_map::Entry;
use std::collections::{HashMap, HashSet};
use std::ops::Bound;

use common::DfValue;
use readyset_client::KeyComparison;
use readyset_errors::{internal, ReadySetResult};
use serde::{Deserialize, Serialize};
use vec1::Vec1;

use crate::payload::{EvictRequest, ReplayPieceContext};
use crate::prelude::NodeIndex;
use crate::Packet;

type ColumnIndexes = Vec<usize>;

/// The set of keys that have been requested for a particular node
#[derive(Serialize, Deserialize, PartialEq, Eq, Clone, Default, Debug)]
pub struct NodeKeys {
    //
    
    fn process_random_packet() {
        let original_packet = Packet::Spin;
        let mut processed_packet = original_packet.clone();
        let ni = NodeIndex::new(3);

        let mut processor = PacketFilter::default();

        let should_send = processor.process(&mut processed_packet, None, ni).unwrap();

        assert!(
            should_send,
            "The process should be signaling that the packet can be sent"
        );
        assert_eq!(
            original_packet, processed_packet,
            "The packet should still be the same"
        );
        assert!(
            processor.requested_keys.is_empty(),
            "The allowlist should not have been modified"
        );
    }