1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47

use std::error::Error;
use std::fmt::Display;
use std::fmt;

#[derive(Debug)]
pub struct HttpError {
    pub code: u16,
    pub url: String,
}

#[derive(Debug)]
pub enum HnError {
    // Error used when parsing of an HTML document fails
    HtmlParsingError,
    // Error used when program attempts to invoke an action requiring authentication,
    // but is not authenticated
    UnauthenticatedError,
    // Error used when a client fails to authenticate
    AuthenticationError,
    // Error raised from a failure during an HTTP request/response 
    HttpError(HttpError),
}

impl Display for HnError {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        match self {
            HnError::HtmlParsingError => {
                write!(f, "HtmlParsingErr: There was a problem parsing HTML data. This is an internal library error.")
            },
            HnError::UnauthenticatedError => {
                write!(f, "UnauthenticatedError: An unauthenticated client attempted an action requiring authorization.")
            }
            HnError::AuthenticationError => {
                write!(f, "A client failed to authenticate. Please check credential information, and authentication frequency")
            }
            HnError::HttpError(http_err) => {
                write!(f, "A client failed during an HTTP request/response; url '{}', code '{}'",
                    http_err.url,
                    http_err.code,
                )
            }
        }
    }
}


impl Error for HnError {}