postro 0.1.1

Asynchronous Postgres Driver and Utility
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58

use serde::{Deserialize, Serialize, de::DeserializeOwned};

use crate::{
    Decode, DecodeError, Encode,
    encode::Encoded,
    postgres::{Oid, PgType},
    row::Column,
};

/// Decode and Encode postgres json value.
///
/// # Panics
///
/// Note that when performing [`Encode`], if [`Serialize`] implementation decide
/// to fail, it will will panics.
pub struct Json<T>(T);

impl<T> PgType for Json<T> {
    /// jsonb, Binary JSON
    const OID: Oid = 3802;
}

impl<T> Decode for Json<T>
where
    T: DeserializeOwned,
{
    fn decode(column: Column) -> Result<Self, DecodeError> {
        if column.oid() != Self::OID {
            return Err(DecodeError::OidMissmatch);
        }
        serde_json::from_slice(&column.into_value()).map_err(Into::into)
    }
}

impl<T: Serialize> Encode<'static> for Json<T> {
    fn encode(self) -> Encoded<'static> {
        Encoded::owned(serde_json::to_vec(&self).unwrap(), Self::OID)
    }
}

impl<T: Serialize> Serialize for Json<T> {
    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
    where
        S: serde::Serializer,
    {
        self.0.serialize(serializer)
    }
}

impl<'de, T: Deserialize<'de>> Deserialize<'de> for Json<T> {
    fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
    where
        D: serde::Deserializer<'de>,
    {
        Ok(Self(T::deserialize(deserializer)?))
    }
}