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Merge pull request #109 from xsnippet/serialization
Make Snippet and Changeset serializable
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,64 @@ | ||
| use serde::{Serialize, Serializer}; | ||
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| type ChronoUtc = chrono::DateTime<chrono::Utc>; | ||
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| /// A wrapper around DateTime<Utc> from chrono that allows us | ||
| /// to implement Serialize (otherwise, Rust forbids implementing | ||
| /// a foreign trait for a foreign type from a different crate). | ||
| #[derive(Debug, PartialEq, Eq, PartialOrd, Ord)] | ||
| pub struct DateTime(ChronoUtc); | ||
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| impl From<ChronoUtc> for DateTime { | ||
| fn from(value: ChronoUtc) -> Self { | ||
| Self(value) | ||
| } | ||
| } | ||
| impl From<DateTime> for ChronoUtc { | ||
| fn from(value: DateTime) -> Self { | ||
| value.0 | ||
| } | ||
| } | ||
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| impl Serialize for DateTime { | ||
| fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error> | ||
| where | ||
| S: Serializer, | ||
| { | ||
| serializer.serialize_str(&self.0.to_rfc3339()) | ||
| } | ||
| } | ||
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| #[cfg(test)] | ||
| mod tests { | ||
| use super::*; | ||
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| #[test] | ||
| fn test_datetime_from() { | ||
| let reference = chrono::DateTime::parse_from_rfc3339("2020-08-09T10:39:57+00:00") | ||
| .unwrap() | ||
| .with_timezone(&chrono::Utc); | ||
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| // from() conversions work in both directions: chrono::DateTime --> DateTime | ||
| let dt = DateTime::from(reference); | ||
| assert_eq!(dt.0, reference); | ||
|
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| // and DateTime --> chrono::DateTime | ||
| let chrono_dt = chrono::DateTime::from(dt); | ||
| assert_eq!(chrono_dt, reference); | ||
| } | ||
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| #[test] | ||
| fn test_datetime_serialize() { | ||
| let reference = chrono::DateTime::parse_from_rfc3339("2020-08-09T10:39:57+00:00") | ||
| .unwrap() | ||
| .with_timezone(&chrono::Utc); | ||
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| let dt = DateTime::from(reference); | ||
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| // DateTime is serialized to its string representation (JSON strings are | ||
| // enclosed in double quotes) | ||
| let expected = "\"2020-08-09T10:39:57+00:00\""; | ||
| let actual = serde_json::to_string(&dt).expect("failed to serilize DateTime"); | ||
| assert_eq!(actual, expected); | ||
| } | ||
| } |