portus 0.9.0

A Congestion Control Plane
Documentation 
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//! Message sent from datapath to CCP when it starts up, indicating its address

use super::{AsRawMsg, HDR_LENGTH, RawMsg, u32_to_u8s};
use crate::Result;
use std::io::prelude::*;

pub(crate) const READY: u8 = 5;

#[derive(Clone, Copy, Debug, PartialEq)]
pub struct Msg {
    pub id: u32,
}

impl AsRawMsg for Msg {
    fn get_hdr(&self) -> (u8, u32, u32) {
        (READY, HDR_LENGTH + 1 * 4, 0)
    }

    fn get_u32s<W: Write>(&self, w: &mut W) -> Result<()> {
        let mut buf = [0u8; 4];
        u32_to_u8s(&mut buf, self.id as u32);
        w.write_all(&buf[..])?;
        Ok(())
    }

    fn get_bytes<W: Write>(&self, _: &mut W) -> Result<()> {
        Ok(())
    }

    fn from_raw_msg(msg: RawMsg) -> Result<Self> {
        let u32s = unsafe { msg.get_u32s() }?;
        Ok(Msg { id: u32s[0] })
    }
}

#[cfg(test)]
mod tests {
    macro_rules! check_ready_msg {
        ($id: ident, $msg: expr_2021) => {
            check_msg!(
                $id,
                super::Msg,
                $msg,
                crate::serialize::Msg::Rdy(rdym),
                rdym
            );
        };
    }

    check_ready_msg!(test_ready_1, super::Msg { id: 7 });
}