arc_vector_rust/
serde.rs

1use crate::client::Payload;
2use crate::arc_vector::value::Kind;
3use crate::arc_vector::{ListValue, Struct, Value};
4use serde::ser::{SerializeMap, SerializeSeq};
5use serde::{Deserialize, Deserializer, Serialize, Serializer};
6use std::collections::HashMap;
7use std::fmt::{Display, Formatter};
8
9#[derive(Debug)]
10pub struct PayloadConversionError(serde_json::Value);
11
12impl Display for PayloadConversionError {
13    fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
14        write!(
15            f,
16            "Failed to convert json {} to payload: expected object at the top level",
17            self.0
18        )
19    }
20}
21
22impl Serialize for Value {
23    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
24    where
25        S: Serializer,
26    {
27        if let Some(value) = &self.kind {
28            match value {
29                Kind::NullValue(_v) => serializer.serialize_none(),
30                Kind::DoubleValue(double) => serializer.serialize_f64(*double),
31                Kind::IntegerValue(int) => serializer.serialize_i64(*int),
32                Kind::StringValue(str) => serializer.serialize_str(str),
33                Kind::BoolValue(bool) => serializer.serialize_bool(*bool),
34                Kind::StructValue(struc) => {
35                    let mut map = serializer.serialize_map(Some(struc.fields.len()))?;
36                    for (k, v) in struc.fields.iter() {
37                        map.serialize_entry(k, v)?;
38                    }
39                    map.end()
40                }
41                Kind::ListValue(list) => {
42                    let mut seq = serializer.serialize_seq(Some(list.values.len()))?;
43                    for v in &list.values {
44                        seq.serialize_element(v)?;
45                    }
46                    seq.end()
47                }
48            }
49        } else {
50            serializer.serialize_none()
51        }
52    }
53}
54
55impl From<serde_json::Value> for Value {
56    fn from(value: serde_json::Value) -> Self {
57        match value {
58            serde_json::Value::Null => Self {
59                kind: Some(Kind::NullValue(0)),
60            },
61            serde_json::Value::Bool(bool) => Self {
62                kind: Some(Kind::BoolValue(bool)),
63            },
64            serde_json::Value::Number(num) => {
65                if let Some(num) = num.as_i64() {
66                    Self {
67                        kind: Some(Kind::IntegerValue(num)),
68                    }
69                } else if let Some(num) = num.as_f64() {
70                    Self {
71                        kind: Some(Kind::DoubleValue(num)),
72                    }
73                } else {
74                    Self {
75                        kind: Some(Kind::DoubleValue(f64::NAN)),
76                    }
77                }
78            }
79            serde_json::Value::String(str) => Self {
80                kind: Some(Kind::StringValue(str)),
81            },
82            serde_json::Value::Array(arr) => Self {
83                kind: Some(Kind::ListValue(ListValue {
84                    values: arr.into_iter().map(|v| v.into()).collect(),
85                })),
86            },
87            serde_json::Value::Object(obj) => Self {
88                kind: Some(Kind::StructValue(Struct {
89                    fields: obj
90                        .into_iter()
91                        .map(|(k, v)| (k, v.into()))
92                        .collect::<HashMap<_, _>>(),
93                })),
94            },
95        }
96    }
97}
98
99impl TryFrom<serde_json::Value> for Payload {
100    type Error = PayloadConversionError;
101
102    fn try_from(value: serde_json::Value) -> Result<Self, Self::Error> {
103        if let serde_json::Value::Object(obj) = value {
104            Ok(Payload::new_from_hashmap(
105                obj.into_iter().map(|(k, v)| (k, v.into())).collect(),
106            ))
107        } else {
108            Err(PayloadConversionError(value))
109        }
110    }
111}
112
113impl<'de> Deserialize<'de> for Value {
114    fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
115    where
116        D: Deserializer<'de>,
117    {
118        // rely on serde_json to materialize a JSON value for conversion
119        let serde_value = serde_json::Value::deserialize(deserializer)?;
120        Ok(serde_value.into())
121    }
122}
123
124#[cfg(test)]
125mod tests {
126    use super::*;
127    use crate::client::Payload;
128    use serde_json::json;
129
130    #[test]
131    fn json_payload_round_trip() {
132        let payload: Payload = vec![
133            ("some_string", "Bar".into()),
134            ("some_bool", true.into()),
135            ("some_int", 12.into()),
136            ("some_float", 2.3.into()),
137            ("some_seq", vec!["elem1", "elem2"].into()),
138            ("some_obj", vec![("key", "value")].into()),
139        ]
140        .into_iter()
141        .collect::<HashMap<_, Value>>()
142        .into();
143
144        // payload -> Json string
145        let json_value = serde_json::to_string(&payload).unwrap();
146
147        // Json string -> payload
148        let payload_back: Payload = serde_json::from_str(&json_value).unwrap();
149
150        // assert round trip
151        assert_eq!(payload, payload_back);
152    }
153
154    #[test]
155    fn payload_from_string() {
156        let json = r#"{
157            "some_string": "Bar",
158            "some_bool": true,
159            "some_int": 12,
160            "some_float": 2.3,
161            "some_seq": ["elem1", "elem2"],
162            "some_obj": {"key": "value"}
163            }"#;
164
165        // String -> payload
166        let parsed_payload: Payload = serde_json::from_str(json).unwrap();
167
168        let expected: Payload = vec![
169            ("some_string", "Bar".into()),
170            ("some_bool", true.into()),
171            ("some_int", 12.into()),
172            ("some_float", 2.3.into()),
173            ("some_seq", vec!["elem1", "elem2"].into()),
174            ("some_obj", vec![("key", "value")].into()),
175        ]
176        .into_iter()
177        .collect::<HashMap<_, Value>>()
178        .into();
179
180        // assert expected
181        assert_eq!(parsed_payload, expected);
182    }
183
184    #[test]
185    fn test_json_macro() {
186        let json_value = json!({
187            "some_string": "Bar",
188            "some_bool": true,
189            "some_int": 12,
190            "some_float": 2.3,
191            "some_seq": ["elem1", "elem2"],
192            "some_obj": {"key": "value"}
193        });
194
195        let payload: Payload = json_value.try_into().unwrap();
196
197        eprintln!("payload = {:#?}", payload);
198    }
199}
arc_vector_rust/serde.rs

arc_vector_rust/
serde.rs
