Parse a RIB dump file into prefix-to-AS mapping HashMap

pfx2as.rs

fn pfx2as(url: &str) -> Result<HashMap<IpNet, HashSet<u32>>> {
    let mut data: HashMap<IpNet, HashSet<u32>> = HashMap::new();
    for elem in bgpkit_parser::BgpkitParser::new(url)? {
        let prefix = elem.prefix.prefix;
        let origins = elem
            .origin_asns
            .unwrap()
            .into_iter()
            .map(|v| v.asn)
            .collect::<Vec<u32>>();
        data.entry(prefix)
            .or_insert_with(|| HashSet::new())
            .extend(origins);
    }
    Ok(data)
}

https://github.com/bgpkit/bgpkit-parser