tanzim_source/
serde.rs

1//! [`serde`] support (`serde` Cargo feature).
2//!
3//! [`Source`] serializes and deserializes as its canonical string form.
4
5use crate::Source;
6use serde::{
7    Deserialize, Deserializer, Serialize, Serializer,
8    de::{self, Visitor},
9};
10use std::fmt;
11
12impl Serialize for Source {
13    fn serialize<S: Serializer>(&self, serializer: S) -> Result<S::Ok, S::Error> {
14        serializer.serialize_str(&self.to_string())
15    }
16}
17
18impl<'de> Deserialize<'de> for Source {
19    fn deserialize<D: Deserializer<'de>>(deserializer: D) -> Result<Self, D::Error> {
20        deserializer.deserialize_str(SourceVisitor)
21    }
22}
23
24struct SourceVisitor;
25
26impl<'de> Visitor<'de> for SourceVisitor {
27    type Value = Source;
28
29    fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
30        formatter.write_str("a configuration source string such as `env(prefix=APP)`")
31    }
32
33    fn visit_str<E: de::Error>(self, value: &str) -> Result<Self::Value, E> {
34        Source::parse(value).map_err(|error| E::custom(error.to_string()))
35    }
36
37    fn visit_string<E: de::Error>(self, value: String) -> Result<Self::Value, E> {
38        self.visit_str(value.as_str())
39    }
40}
41
42#[cfg(test)]
43mod tests {
44    use super::*;
45    use crate::OptionValue;
46    use serde::{Deserialize, Serialize};
47
48    #[derive(Serialize, Deserialize, PartialEq, Debug)]
49    struct App {
50        source: Source,
51    }
52
53    #[test]
54    fn deserializes_config_source_from_string() {
55        let app: App = serde_json::from_str(r#"{ "source": "env(prefix=APP_)" }"#).unwrap();
56        assert_eq!(app.source.source(), "env");
57        assert_eq!(
58            app.source.options().get("prefix"),
59            Some(&OptionValue::String("APP_".into()))
60        );
61    }
62
63    #[test]
64    fn serializes_config_source_as_string() {
65        let app = App {
66            source: Source::parse("file?:.env").unwrap(),
67        };
68        let json = serde_json::to_string(&app).unwrap();
69        assert_eq!(json, r#"{"source":"file?:.env"}"#);
70    }
71
72    #[test]
73    fn deserializes_invalid_config_source_with_parse_error() {
74        let error = serde_json::from_str::<App>(r#"{ "source": "env(prefix=)" }"#).unwrap_err();
75        let message = error.to_string();
76        assert!(message.contains("configuration source option value cannot be empty"));
77        assert!(!message.contains('\n'));
78    }
79}
tanzim_source/serde.rs

tanzim_source/
serde.rs
