Before we start coding the FTP server, let's talk about how we'll be handling the errors.
In the previous projects, we used the unwrap() or expect() methods a lot. These methods are handy for fast prototyping, but when we want to write high-quality software, we should avoid them in most cases. Since we're writing an FTP server, a software that must keep running for a long time, we don't want it to crash because we called unwrap() and a client sent a bad command. So, we'll do proper error handling.
Since we can get different types of errors and we want to keep track of all of them, we'll create a custom error type. Let's create a new module in which we'll put this new type:
mod error;
Add it to the src/error.rs file:
use std::io;
use std::str::Utf8Error;
use std::string::FromUtf8Error;
pub enum Error {
FromUtf8(FromUtf8Error),
Io(io::Error),
Msg(String),
Utf8(Utf8Error),
}Here, we have an enum representing the different errors that can...