Rust Programming By Example

Custom error type

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 happen in our FTP server to be implemented. There are UTF-8 errors since FTP is a string-based protocol and I/O errors because we communicate over the network and communication issues can happen. We created variants for error types coming from the standard library, which will be helpful ...