rust_eureka/request/
dcname.rs

1use serde::de::{Deserialize, Deserializer, Error as DeError, Visitor};
2use serde::ser::{Serialize, Serializer};
3use std::convert::From;
4use std::error::Error;
5use std::fmt;
6use std::iter::Iterator;
7use std::str::FromStr;
8
9const MY_OWN: &str = "MyOwn";
10const AMAZON: &str = "Amazon";
11
12#[derive(Debug, PartialEq)]
13pub enum DcName {
14    MyOwn,
15    Amazon,
16}
17
18impl DcName {
19    pub fn values() -> Vec<DcName> {
20        vec![DcName::MyOwn, DcName::Amazon]
21    }
22}
23
24#[derive(Debug)]
25pub struct InvalidDcNameError {
26    invalid_value: String,
27}
28
29impl InvalidDcNameError {
30    pub fn new(invalid_nm: &str) -> Self {
31        InvalidDcNameError {
32            invalid_value: invalid_nm.to_owned(),
33        }
34    }
35}
36
37impl fmt::Display for InvalidDcNameError {
38    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
39        write!(f, "InvalidDcNameError({})", self.invalid_value)
40    }
41}
42
43impl Error for InvalidDcNameError {
44    fn description(&self) -> &str {
45        "Not a valid DCName"
46    }
47}
48
49impl FromStr for DcName {
50    type Err = InvalidDcNameError;
51
52    fn from_str(s: &str) -> Result<Self, Self::Err> {
53        match s {
54            "MyOwn" => Ok(DcName::MyOwn),
55            "Amazon" => Ok(DcName::Amazon),
56            _ => Err(InvalidDcNameError::new(s)),
57        }
58    }
59}
60
61impl From<DcName> for String {
62    fn from(s: DcName) -> Self {
63        match s {
64            DcName::MyOwn => MY_OWN.to_owned(),
65            DcName::Amazon => AMAZON.to_owned(),
66        }
67    }
68}
69
70impl From<&DcName> for String {
71    fn from(s: &DcName) -> Self {
72        match *s {
73            DcName::MyOwn => MY_OWN.to_owned(),
74            DcName::Amazon => AMAZON.to_owned(),
75        }
76    }
77}
78
79impl Serialize for DcName {
80    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
81    where
82        S: Serializer,
83    {
84        serializer.serialize_str(String::from(self).as_ref())
85    }
86}
87
88impl<'de> Deserialize<'de> for DcName {
89    fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
90    where
91        D: Deserializer<'de>,
92    {
93        struct DcNameVisitor;
94
95        impl<'de> Visitor<'de> for DcNameVisitor {
96            type Value = DcName;
97
98            fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
99                let values = DcName::values().iter().fold(String::new(), |mut acc, v| {
100                    acc.push_str(String::from(v).as_ref());
101                    acc
102                });
103
104                formatter.write_fmt(format_args!("Expecting {}", values))
105            }
106
107            fn visit_str<E>(self, v: &str) -> Result<Self::Value, E>
108            where
109                E: DeError,
110            {
111                DcName::from_str(v).map_err(|err| E::custom(format!("{}", err)))
112            }
113        }
114
115        deserializer.deserialize_str(DcNameVisitor)
116    }
117}
118
119#[cfg(test)]
120mod test {
121    use super::*;
122
123    #[test]
124    fn test_from_str() {
125        assert_eq!(DcName::Amazon, DcName::from_str(AMAZON).unwrap());
126        assert_eq!(DcName::MyOwn, DcName::from_str(MY_OWN).unwrap());
127    }
128
129    #[test]
130    #[should_panic]
131    fn test_from_str_invalid() {
132        DcName::from_str("sfd2ef").unwrap();
133    }
134
135    #[test]
136    fn test_to_string() {
137        assert_eq!(AMAZON.to_owned(), String::from(DcName::Amazon));
138        assert_eq!(MY_OWN.to_owned(), String::from(DcName::MyOwn));
139    }
140}
rust_eureka/request/dcname.rs

rust_eureka/request/
dcname.rs
