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: recv_helper.rs
    path of file: ./repos/aquatic/crates/udp/src/workers/socket/uring
    
    the code of the file until where you have to start completion: use std::{
    net::{Ipv6Addr, SocketAddr, SocketAddrV4, SocketAddrV6},
    ptr::null_mut,
};

use aquatic_common::CanonicalSocketAddr;
use aquatic_udp_protocol::{Request, RequestParseError};
use io_uring::{opcode::RecvMsgMulti, types::RecvMsgOut};

use crate::config::Config;

use super::{SOCKET_IDENTIFIER, USER_DATA_RECV};

#[allow(clippy::enum_variant_names)]
pub enum Error {
    RecvMsgParseError,
    RecvMsgTruncated,
    RequestParseError(RequestParseError, CanonicalSocketAddr),
    InvalidSocketAddress,
}

pub struct RecvHelper {
    socket_is_ipv4: bool,
    max_scrape_torrents: u8,
    #[allow(dead_code)]
    name_v4: *const libc::sockaddr_in,
    msghdr_
    
    pub fn parse(&self, buffer: &[u8]) -> Result<(Request, CanonicalSocketAddr), Error> {
        let (msg, addr) = if self.socket_is_ipv4 {
            // Safe as long as kernel only reads from the pointer and doesn't
            // write to it. I think this is the case.
            let msghdr = unsafe { self.msghdr_v4.read() };

            let msg = RecvMsgOut::parse(buffer, &msghdr).map_err(|_| Error::RecvMsgParseError)?;

            if msg.is_name_data_truncated() | msg.is_payload_truncated() {
                return Err(Error::RecvMsgTruncated);
            }

            let name_data = unsafe { *(msg.name_data().as_ptr() as *const libc::sockaddr_in) };

            let addr = SocketAddr::V4(SocketAddrV4::new(
                u32::from_be(name_data.sin_addr.s_addr).into(),
                u16::from_be(name_data.sin_port),
            ));

            (msg, addr)
        } else {
            // Safe as long as kernel only reads from the pointer and doesn't
            // write to it. I think this is the case.
            let msghdr = unsafe { self.msghdr_v6.read() };

            let msg = RecvMsgOut::parse(buffer, &msghdr).map_err(|_| Error::RecvMsgParseError)?;

            if msg.is_name_data_truncated() | msg.is_payload_truncated() {
                return Err(Error::RecvMsgTruncated);
            }

            let name_data = unsafe { *(msg.name_data().as_ptr() as *const libc::sockaddr_in6) };

            let addr = SocketAddr::V6(SocketAddrV6::new(
                Ipv6Addr::from(name_data.sin6_addr.s6_addr),
                u16::from_be(name_data.sin6_port),
                u32::from_be(name_data.sin6_flowinfo),
                u32::from_be(name_data.sin6_scope_id),
            ));

            (msg, addr)
        };

        if addr.port() == 0 {
            return Err(Error::InvalidSocketAddress);
        }

        let addr = CanonicalSocketAddr::new(addr);

        let request = Request::parse_bytes(msg.payload_data(), self.max_scrape_torrents)
            .map_err(|err| Error::RequestParseError(err, addr))?;

        Ok((request, addr))
    }