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: request.rs
    path of file: ./repos/zenoh/commons/zenoh-protocol/src/network
    
    the code of the file until where you have to start completion: //
// Copyright (c) 2022 ZettaScale Technology
//
// This program and the accompanying materials are made available under the
// terms of the Eclipse Public License 2.0 which is available at
// http://www.eclipse.org/legal/epl-2.0, or the Apache License, Version 2.0
// which is available at https://www.apache.org/licenses/LICENSE-2.0.
//
// SPDX-License-Identifier: EPL-2.0 OR Apache-2.0
//
// Contributors:
//   ZettaScale Zenoh Team, <zenoh@zettascale.tech>
//
use crate::{core::WireExpr, zenoh::RequestBody};
use core::sync::atomic::AtomicU32;

/// The resolution of a RequestId
pub type RequestId = u32;
pub type AtomicRequestId = AtomicU32;

pub mod flag {
    pub const N: u8 = 1 << 5; // 0x20 Named         if N==1 then the key expr has name/suffix
    pub const M: u8 = 1 << 6; // 0x40 Mapping       if M==1 then key expr mapping is the one declared by the sender, else it is the one declared 
    
    pub fn rand() -> Self {
        use core::num::NonZeroU32;

        use rand::Rng;

        let mut rng = rand::thread_rng();
        let wire_expr = WireExpr::rand();
        let id: RequestId = rng.gen();
        let payload = RequestBody::rand();
        let ext_qos = ext::QoSType::rand();
        let ext_tstamp = rng.gen_bool(0.5).then(ext::TimestampType::rand);
        let ext_nodeid = ext::NodeIdType::rand();
        let ext_target = ext::TargetType::rand();
        let ext_budget = if rng.gen_bool(0.5) {
            NonZeroU32::new(rng.gen())
        } else {
            None
        };
        let ext_timeout = if rng.gen_bool(0.5) {
            Some(ext::TimeoutType::from_millis(rng.gen()))
        } else {
            None
        };

        Self {
            wire_expr,
            id,
            payload,
            ext_qos,
            ext_tstamp,
            ext_nodeid,
            ext_target,
            ext_budget,
            ext_timeout,
        }
    }