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use crate::decode::Decode;
use crate::encode::{Encode, IsNull};
use crate::error::BoxDynError;
use crate::postgres::types::array_compatible;
use crate::postgres::{PgArgumentBuffer, PgTypeInfo, PgValueFormat, PgValueRef, Postgres};
use crate::types::{Json, Type};
use serde::{Deserialize, Serialize};
impl<T> Type<Postgres> for Json<T> {
fn type_info() -> PgTypeInfo {
PgTypeInfo::JSONB
}
fn compatible(ty: &PgTypeInfo) -> bool {
*ty == PgTypeInfo::JSON || *ty == PgTypeInfo::JSONB
}
}
impl<T> Type<Postgres> for [Json<T>] {
fn type_info() -> PgTypeInfo {
PgTypeInfo::JSONB_ARRAY
}
fn compatible(ty: &PgTypeInfo) -> bool {
array_compatible::<Json<T>>(ty)
}
}
impl<T> Type<Postgres> for Vec<Json<T>> {
fn type_info() -> PgTypeInfo {
<[Json<T>] as Type<Postgres>>::type_info()
}
fn compatible(ty: &PgTypeInfo) -> bool {
<[Json<T>] as Type<Postgres>>::compatible(ty)
}
}
impl<'q, T> Encode<'q, Postgres> for Json<T>
where
T: Serialize,
{
fn encode_by_ref(&self, buf: &mut PgArgumentBuffer) -> IsNull {
buf.patch(|buf, ty: &PgTypeInfo| {
if *ty == PgTypeInfo::JSON || *ty == PgTypeInfo::JSON_ARRAY {
buf[0] = b' ';
}
});
buf.push(1);
serde_json::to_writer(&mut **buf, &self.0)
.expect("failed to serialize to JSON for encoding on transmission to the database");
IsNull::No
}
}
impl<'r, T: 'r> Decode<'r, Postgres> for Json<T>
where
T: Deserialize<'r>,
{
fn decode(value: PgValueRef<'r>) -> Result<Self, BoxDynError> {
let mut buf = value.as_bytes()?;
if value.format() == PgValueFormat::Binary && value.type_info == PgTypeInfo::JSONB {
assert_eq!(
buf[0], 1,
"unsupported JSONB format version {}; please open an issue",
buf[0]
);
buf = &buf[1..];
}
serde_json::from_slice(buf).map(Json).map_err(Into::into)
}
}