Rust Programming By Example

Quitting

Let's now implement the QUIT command. As always, we need to add a case in the handle_cmd() method:

#[async]
fn handle_cmd(mut self, cmd: Command) -> Result<Self> {
    match cmd {
        Command::Quit => self = await!(self.quit())?,
        // …
    }
}

And here is the code of the quit() method:

#[async]
fn quit(mut self) -> Result<Self> {
    if self.data_writer.is_some() {
        unimplemented!();
    } else {
        self = await!(self.send(Answer::new(ResultCode::ServiceClosingControlConnection, "Closing connection...")))?;
        self.writer.close()?;
    }
    Ok(self)
}

So, we send a response back to the client and close() the writer.

To finish this chapter, let's implement the command to create and delete directories.