junobuild_utils/serializers/
nat.rs

1use crate::serializers::types::JsonDataNat;
2use serde::de::{self, MapAccess, Visitor};
3use serde::ser::SerializeStruct;
4use serde::{Deserialize, Deserializer, Serialize, Serializer};
5use std::fmt;
6
7impl fmt::Display for JsonDataNat {
8    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
9        write!(f, "{}", self.value)
10    }
11}
12
13impl Serialize for JsonDataNat {
14    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
15    where
16        S: Serializer,
17    {
18        let mut state = serializer.serialize_struct("DocDataNat", 1)?;
19        state.serialize_field("__bigint__", &self.value.to_string())?;
20        state.end()
21    }
22}
23
24impl<'de> Deserialize<'de> for JsonDataNat {
25    fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
26    where
27        D: Deserializer<'de>,
28    {
29        deserializer.deserialize_struct("DocDataNat", &["__bigint__"], DocDataNatVisitor)
30    }
31}
32
33struct DocDataNatVisitor;
34
35impl<'de> Visitor<'de> for DocDataNatVisitor {
36    type Value = JsonDataNat;
37
38    fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
39        formatter.write_str("an object with a key __bigint__")
40    }
41
42    fn visit_map<V>(self, mut map: V) -> Result<JsonDataNat, V::Error>
43    where
44        V: MapAccess<'de>,
45    {
46        let mut value = None;
47        while let Some(key) = map.next_key::<String>()? {
48            if key == "__bigint__" {
49                if value.is_some() {
50                    return Err(de::Error::duplicate_field("__bigint__"));
51                }
52                value = Some(map.next_value::<String>()?);
53            }
54        }
55        let value_str = value.ok_or_else(|| de::Error::missing_field("__bigint__"))?;
56        let nat_value = value_str
57            .parse::<u128>()
58            .map_err(|_| de::Error::custom("Invalid format for __bigint__"))?;
59        Ok(JsonDataNat { value: nat_value })
60    }
61}
62
63#[cfg(test)]
64mod tests {
65    use super::*;
66    use serde_json;
67
68    #[test]
69    fn serialize_doc_data_nat() {
70        let data = JsonDataNat {
71            value: 12345678901234,
72        };
73        let s = serde_json::to_string(&data).expect("serialize");
74        assert_eq!(s, r#"{"__bigint__":"12345678901234"}"#);
75    }
76
77    #[test]
78    fn deserialize_doc_data_nat() {
79        let s = r#"{"__bigint__":"12345678901234"}"#;
80        let data: JsonDataNat = serde_json::from_str(s).expect("deserialize");
81        assert_eq!(data.value, 12345678901234);
82    }
83
84    #[test]
85    fn round_trip() {
86        let original = JsonDataNat { value: u128::MAX };
87        let json = serde_json::to_string(&original).unwrap();
88        let decoded: JsonDataNat = serde_json::from_str(&json).unwrap();
89        assert_eq!(decoded.value, original.value);
90    }
91
92    #[test]
93    fn error_on_missing_field() {
94        let err = serde_json::from_str::<JsonDataNat>(r#"{}"#).unwrap_err();
95        assert!(
96            err.to_string().contains("missing field `__bigint__`"),
97            "got: {err}"
98        );
99    }
100
101    #[test]
102    fn error_on_duplicate_field() {
103        let s = r#"{"__bigint__":"123","__bigint__":"456"}"#;
104        let err = serde_json::from_str::<JsonDataNat>(s).unwrap_err();
105        assert!(
106            err.to_string().contains("duplicate field `__bigint__`"),
107            "got: {err}"
108        );
109    }
110
111    #[test]
112    fn error_on_invalid_nat_format() {
113        let s = r#"{"__bigint__":"not-a-number"}"#;
114        let err = serde_json::from_str::<JsonDataNat>(s).unwrap_err();
115        assert!(
116            err.to_string().contains("Invalid format for __bigint__"),
117            "got: {err}"
118        );
119    }
120
121    #[test]
122    fn test_display_implementation() {
123        let data = JsonDataNat {
124            value: 12345678901234,
125        };
126        assert_eq!(format!("{}", data), "12345678901234");
127    }
128}
junobuild_utils/serializers/nat.rs

junobuild_utils/serializers/
nat.rs
