1use std::io::prelude::*;
2
3use crate::deserialize::{self, FromSql, FromSqlRow};
4use crate::expression::AsExpression;
5use crate::pg::{Pg, PgValue};
6use crate::serialize::{self, IsNull, Output, ToSql};
7use crate::sql_types::Uuid;
8
9#[derive(AsExpression, FromSqlRow)]
10#[diesel(foreign_derive)]
11#[diesel(sql_type = Uuid)]
12#[allow(dead_code)]
13struct UuidProxy(uuid::Uuid);
14
15#[cfg(all(feature = "postgres_backend", feature = "uuid"))]
16impl FromSql<Uuid, Pg> for uuid::Uuid {
17 fn from_sql(value: PgValue<'_>) -> deserialize::Result<Self> {
18 uuid::Uuid::from_slice(value.as_bytes()).map_err(Into::into)
19 }
20}
21
22#[cfg(all(feature = "postgres_backend", feature = "uuid"))]
23impl ToSql<Uuid, Pg> for uuid::Uuid {
24 fn to_sql<'b>(&'b self, out: &mut Output<'b, '_, Pg>) -> serialize::Result {
25 out.write_all(self.as_bytes())
26 .map(|_| IsNull::No)
27 .map_err(Into::into)
28 }
29}
30
31#[cfg(test)]
32mod tests {
33 use super::*;
34
35 #[diesel_test_helper::test]
36 fn uuid_to_sql() {
37 use crate::query_builder::bind_collector::ByteWrapper;
38
39 let mut buffer = Vec::new();
40 let bytes = [
41 0xFF_u8, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66,
42 0x31, 0x32,
43 ];
44
45 let test_uuid = uuid::Uuid::from_slice(&bytes).unwrap();
46 let mut bytes = Output::test(ByteWrapper(&mut buffer));
47 ToSql::<Uuid, Pg>::to_sql(&test_uuid, &mut bytes).unwrap();
48 assert_eq!(&buffer, test_uuid.as_bytes());
49 }
50
51 #[diesel_test_helper::test]
52 fn some_uuid_from_sql() {
53 let bytes = [
54 0xFF_u8, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66,
55 0x31, 0x32,
56 ];
57 let input_uuid = uuid::Uuid::from_slice(&bytes).unwrap();
58 let output_uuid =
59 <uuid::Uuid as FromSql<Uuid, Pg>>::from_sql(PgValue::for_test(input_uuid.as_bytes()))
60 .unwrap();
61 assert_eq!(input_uuid, output_uuid);
62 }
63
64 #[diesel_test_helper::test]
65 fn bad_uuid_from_sql() {
66 let uuid = uuid::Uuid::from_sql(PgValue::for_test(b"boom"));
67 assert!(uuid.is_err());
68 let error_message = uuid.unwrap_err().to_string();
75 assert!(error_message.starts_with("invalid"));
76 assert!(error_message.contains("length"));
77 assert!(error_message.contains("expected 16"));
78 assert!(error_message.ends_with("found 4"));
79 }
80
81 #[diesel_test_helper::test]
82 fn no_uuid_from_sql() {
83 let uuid = uuid::Uuid::from_nullable_sql(None);
84 assert_eq!(
85 uuid.unwrap_err().to_string(),
86 "Unexpected null for non-null column"
87 );
88 }
89}