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use serde_1::{Deserialize, Serialize};
use serde_json_1::Value;
use std::error::Error;
use std::fmt::Debug;
use std::io::Read;
use crate::types::{FromSql, IsNull, ToSql, Type};
#[derive(Debug)]
pub struct Json<T>(pub T);
impl<'a, T> FromSql<'a> for Json<T>
where
T: Deserialize<'a>,
{
fn from_sql(ty: &Type, mut raw: &'a [u8]) -> Result<Json<T>, Box<dyn Error + Sync + Send>> {
if *ty == Type::JSONB {
let mut b = [0; 1];
raw.read_exact(&mut b)?;
if b[0] != 1 {
return Err("unsupported JSONB encoding version".into());
}
}
serde_json_1::de::from_slice(raw)
.map(Json)
.map_err(Into::into)
}
accepts!(JSON, JSONB);
}
impl<T> ToSql for Json<T>
where
T: Serialize + Debug,
{
fn to_sql(&self, ty: &Type, out: &mut Vec<u8>) -> Result<IsNull, Box<dyn Error + Sync + Send>> {
if *ty == Type::JSONB {
out.push(1);
}
serde_json_1::ser::to_writer(out, &self.0)?;
Ok(IsNull::No)
}
accepts!(JSON, JSONB);
to_sql_checked!();
}
impl<'a> FromSql<'a> for Value {
fn from_sql(ty: &Type, raw: &[u8]) -> Result<Value, Box<dyn Error + Sync + Send>> {
Json::<Value>::from_sql(ty, raw).map(|json| json.0)
}
accepts!(JSON, JSONB);
}
impl ToSql for Value {
fn to_sql(&self, ty: &Type, out: &mut Vec<u8>) -> Result<IsNull, Box<dyn Error + Sync + Send>> {
Json(self).to_sql(ty, out)
}
accepts!(JSON, JSONB);
to_sql_checked!();
}