c_ares_resolver/
error.rs

1use std::error;
2use std::fmt;
3use std::io;
4
5/// Error codes that the library might return.
6#[derive(Debug)]
7pub enum Error {
8    /// An `io::Error`.
9    Io(io::Error),
10
11    /// A `c_ares::Error`.
12    Ares(c_ares::Error),
13}
14
15impl fmt::Display for Error {
16    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
17        match *self {
18            Self::Io(ref err) => err.fmt(f),
19            Self::Ares(ref err) => err.fmt(f),
20        }
21    }
22}
23
24impl error::Error for Error {
25    fn source(&self) -> Option<&(dyn error::Error + 'static)> {
26        match *self {
27            Self::Io(ref err) => Some(err),
28            Self::Ares(ref err) => Some(err),
29        }
30    }
31}
32
33impl From<io::Error> for Error {
34    fn from(err: io::Error) -> Self {
35        Self::Io(err)
36    }
37}
38
39impl From<c_ares::Error> for Error {
40    fn from(err: c_ares::Error) -> Self {
41        Self::Ares(err)
42    }
43}
44
45#[cfg(test)]
46mod tests {
47    use super::*;
48    use std::error::Error as StdError;
49
50    fn assert_send<T: Send>() {}
51    fn assert_sync<T: Sync>() {}
52
53    #[test]
54    fn error_is_send() {
55        assert_send::<Error>();
56    }
57
58    #[test]
59    fn error_is_sync() {
60        assert_sync::<Error>();
61    }
62
63    #[test]
64    fn display_io_error() {
65        let io_err = io::Error::new(io::ErrorKind::NotFound, "file not found");
66        let err = Error::Io(io_err);
67        let display = format!("{err}");
68        assert!(display.contains("file not found"));
69    }
70
71    #[test]
72    fn display_ares_error() {
73        let ares_err = c_ares::Error::ENODATA;
74        let err = Error::Ares(ares_err);
75        let display = format!("{err}");
76        assert!(!display.is_empty());
77    }
78
79    #[test]
80    fn source_io_error() {
81        let io_err = io::Error::new(io::ErrorKind::NotFound, "test error");
82        let err = Error::Io(io_err);
83        assert!(err.source().is_some());
84    }
85
86    #[test]
87    fn source_ares_error() {
88        let ares_err = c_ares::Error::ENODATA;
89        let err = Error::Ares(ares_err);
90        assert!(err.source().is_some());
91    }
92
93    #[test]
94    fn from_io_error() {
95        let io_err = io::Error::other("test");
96        let err: Error = io_err.into();
97        assert!(matches!(err, Error::Io(_)));
98    }
99
100    #[test]
101    fn from_ares_error() {
102        let ares_err = c_ares::Error::ENOTFOUND;
103        let err: Error = ares_err.into();
104        assert!(matches!(err, Error::Ares(_)));
105    }
106
107    #[test]
108    fn debug_format() {
109        let io_err = io::Error::other("test");
110        let err = Error::Io(io_err);
111        let debug = format!("{err:?}");
112        assert!(debug.contains("Io"));
113    }
114}
c_ares_resolver/error.rs

c_ares_resolver/
error.rs
