lightning improvement equipment – Greatest manner so as to add my very own wire message to LDK

I see that we should implement Readable and Writable for wire messages (+ different issues) at rust-lightning/lightning/src/ln/msgs.rs#L3673-L3698.

However I didn’t get the distinction between (utilizing present WarningMessage as instance):

impl Writeable for WarningMessage {
    fn write(&self, w: &mut W) -> End result<(), io::Error> {
        self.channel_id.write(w)?;
        (self.information.len() as u16).write(w)?;
        w.write_all(self.information.as_bytes())?;
        Okay(())
    }
}

impl Readable for WarningMessage {
    fn learn(r: &mut R) -> End result {
        Okay(Self {
            channel_id: Readable::learn(r)?,
            information: {
                let sz: usize = ::learn(r)? as usize;
                let mut information = Vec::with_capacity(sz);
                information.resize(sz, 0);
                r.read_exact(&mut information)?;
                match String::from_utf8(information) {
                    Okay(s) => s,
                    Err(_) => return Err(DecodeError::InvalidValue),
                }
            }
        })
    }
}

And:

impl_writeable_msg!(WarningMessage, {
    channel_id,
    information,
}, {});

Each passes the check:

cargo check --package lightning --lib -- ln::msgs::exams::encoding_warning --exact --show-output

I see that we should implement Readable and Writable for wire messages (+ different issues) at rust-lightning/lightning/src/ln/msgs.rs#L3673-L3698.

However I didn’t get the distinction between (utilizing present WarningMessage as instance):

impl Writeable for WarningMessage {
    fn write(&self, w: &mut W) -> End result<(), io::Error> {
        self.channel_id.write(w)?;
        (self.information.len() as u16).write(w)?;
        w.write_all(self.information.as_bytes())?;
        Okay(())
    }
}

impl Readable for WarningMessage {
    fn learn(r: &mut R) -> End result {
        Okay(Self {
            channel_id: Readable::learn(r)?,
            information: {
                let sz: usize = ::learn(r)? as usize;
                let mut information = Vec::with_capacity(sz);
                information.resize(sz, 0);
                r.read_exact(&mut information)?;
                match String::from_utf8(information) {
                    Okay(s) => s,
                    Err(_) => return Err(DecodeError::InvalidValue),
                }
            }
        })
    }
}

And:

impl_writeable_msg!(WarningMessage, {
    channel_id,
    information,
}, {});

Each passes the check:

cargo check --package lightning --lib -- ln::msgs::exams::encoding_warning --exact --show-output