Revert default compact serialization

shared/error.rs

@@ -14,6 +14,9 @@ pub(crate) enum ErrorKind {
     ///
     /// [`Uuid`]: ../struct.Uuid.html
     SimpleLength { len: usize },
+    /// A byte array didn't contain 16 bytes
+    #[allow(dead_code)]
+    ByteLength { len: usize },
     /// A hyphenated [`Uuid`] didn't contain 5 groups
     ///
     /// [`Uuid`]: ../struct.Uuid.html
@@ -26,6 +29,9 @@ pub(crate) enum ErrorKind {
         len: usize,
         index: usize,
     },
+    /// Some other error occurred.
+    #[allow(dead_code)]
+    Other,
 }
 
 /// A string that is guaranteed to fail to parse to a [`Uuid`].
@@ -126,6 +132,9 @@ impl fmt::Display for Error {
                     len
                 )
             }
+            ErrorKind::ByteLength { len } => {
+                write!(f, "invalid length: expected 16 bytes, found {}", len)
+            }
             ErrorKind::GroupCount { count } => {
                 write!(f, "invalid group count: expected 5, found {}", count)
             }
@@ -137,6 +146,7 @@ impl fmt::Display for Error {
                     group, expected, len
                 )
             }
+            ErrorKind::Other => write!(f, "failed to parse a UUID"),
         }
     }
 }

src/builder.rs

@@ -308,7 +308,7 @@ impl Uuid {
     /// ```
     pub fn from_slice(b: &[u8]) -> Result<Uuid, Error> {
         if b.len() != 16 {
-            return Err(Error(ErrorKind::SimpleLength { len: b.len() * 2 }));
+            return Err(Error(ErrorKind::ByteLength { len: b.len() }));
         }
 
         let mut bytes: Bytes = [0; 16];
@@ -349,7 +349,7 @@ impl Uuid {
     /// ```
     pub fn from_slice_le(b: &[u8]) -> Result<Uuid, Error> {
         if b.len() != 16 {
-            return Err(Error(ErrorKind::SimpleLength { len: b.len() * 2 }));
+            return Err(Error(ErrorKind::ByteLength { len: b.len() }));
         }
 
         let mut bytes: Bytes = [0; 16];
@@ -452,9 +452,7 @@ impl Uuid {
     /// ```
     pub fn from_bytes_ref(bytes: &Bytes) -> &Uuid {
         // SAFETY: `Bytes` and `Uuid` have the same ABI
-        unsafe {
-            &*(bytes as *const Bytes as *const Uuid)
-        }
+        unsafe { &*(bytes as *const Bytes as *const Uuid) }
     }
 }
 

src/external/mod.rs

@@ -1,6 +1,6 @@
 #[cfg(feature = "arbitrary")]
-mod arbitrary_support;
+pub(crate) mod arbitrary_support;
 #[cfg(feature = "serde")]
-mod serde_support;
+pub(crate) mod serde_support;
 #[cfg(feature = "slog")]
-mod slog_support;
+pub(crate) mod slog_support;

src/external/serde_support.rs

@@ -11,9 +11,7 @@
 
 use crate::{
     error::*,
-    fmt::{
-        Braced, Hyphenated, Simple, Urn,
-    },
+    fmt::{Braced, Hyphenated, Simple, Urn},
     std::fmt,
     Uuid,
 };
@@ -29,11 +27,10 @@ impl Serialize for Uuid {
     ) -> Result<S::Ok, S::Error> {
         if serializer.is_human_readable() {
             serializer.serialize_str(
-                self.hyphenated()
-                    .encode_lower(&mut Uuid::encode_buffer()),
+                self.hyphenated().encode_lower(&mut Uuid::encode_buffer()),
             )
         } else {
-            self.as_bytes().serialize(serializer)
+            serializer.serialize_bytes(self.as_bytes())
         }
     }
 }
@@ -139,9 +136,110 @@ impl<'de> Deserialize<'de> for Uuid {
 
             deserializer.deserialize_str(UuidVisitor)
         } else {
-            let bytes: [u8; 16] = Deserialize::deserialize(deserializer)?;
+            struct UuidBytesVisitor;
 
-            Ok(Uuid::from_bytes(bytes))
+            impl<'vi> de::Visitor<'vi> for UuidBytesVisitor {
+                type Value = Uuid;
+
+                fn expecting(
+                    &self,
+                    formatter: &mut fmt::Formatter<'_>,
+                ) -> fmt::Result {
+                    write!(formatter, "bytes")
+                }
+
+                fn visit_bytes<E: de::Error>(
+                    self,
+                    value: &[u8],
+                ) -> Result<Uuid, E> {
+                    Uuid::from_slice(value).map_err(de_error)
+                }
+            }
+
+            deserializer.deserialize_bytes(UuidBytesVisitor)
+        }
+    }
+}
+
+pub mod compact {
+    //! Serialize a [`Uuid`] as a `[u8; 16]`.
+    //!
+    //! [`Uuid`]: ../../struct.Uuid.html
+
+    /// Serialize from a [`Uuid`] as a `[u8; 16]`
+    ///
+    /// [`Uuid`]: ../../struct.Uuid.html
+    pub fn serialize<S>(
+        u: &crate::Uuid,
+        serializer: S,
+    ) -> Result<S::Ok, S::Error>
+    where
+        S: serde::Serializer,
+    {
+        serde::Serialize::serialize(u.as_bytes(), serializer)
+    }
+
+    /// Deserialize a `[u8; 16]` as a [`Uuid`]
+    ///
+    /// [`Uuid`]: ../../struct.Uuid.html
+    pub fn deserialize<'de, D>(deserializer: D) -> Result<crate::Uuid, D::Error>
+    where
+        D: serde::Deserializer<'de>,
+    {
+        let bytes: [u8; 16] = serde::Deserialize::deserialize(deserializer)?;
+
+        Ok(crate::Uuid::from_bytes(bytes))
+    }
+
+    #[cfg(test)]
+    mod tests {
+        use serde_derive::*;
+        use serde_test::{self, Configure};
+
+        #[test]
+        fn test_serialize_compact() {
+            #[derive(Serialize, Debug, Deserialize, PartialEq)]
+            struct UuidContainer {
+                #[serde(with = "crate::serde::compact")]
+                u: crate::Uuid,
+            }
+
+            let uuid_bytes = b"F9168C5E-CEB2-4F";
+            let container = UuidContainer {
+                u: crate::Uuid::from_slice(uuid_bytes).unwrap(),
+            };
+
+            // more complex because of the struct wrapping the actual UUID
+            // serialization
+            serde_test::assert_tokens(
+                &container.compact(),
+                &[
+                    serde_test::Token::Struct {
+                        name: "UuidContainer",
+                        len: 1,
+                    },
+                    serde_test::Token::Str("u"),
+                    serde_test::Token::Tuple { len: 16 },
+                    serde_test::Token::U8(uuid_bytes[0]),
+                    serde_test::Token::U8(uuid_bytes[1]),
+                    serde_test::Token::U8(uuid_bytes[2]),
+                    serde_test::Token::U8(uuid_bytes[3]),
+                    serde_test::Token::U8(uuid_bytes[4]),
+                    serde_test::Token::U8(uuid_bytes[5]),
+                    serde_test::Token::U8(uuid_bytes[6]),
+                    serde_test::Token::U8(uuid_bytes[7]),
+                    serde_test::Token::U8(uuid_bytes[8]),
+                    serde_test::Token::U8(uuid_bytes[9]),
+                    serde_test::Token::U8(uuid_bytes[10]),
+                    serde_test::Token::U8(uuid_bytes[11]),
+                    serde_test::Token::U8(uuid_bytes[12]),
+                    serde_test::Token::U8(uuid_bytes[13]),
+                    serde_test::Token::U8(uuid_bytes[14]),
+                    serde_test::Token::U8(uuid_bytes[15]),
+                    serde_test::Token::TupleEnd,
+                    serde_test::Token::StructEnd,
+                ],
+            )
         }
     }
 }
@@ -204,10 +302,7 @@ mod serde_tests {
     fn test_serialize_hyphenated() {
         let uuid_str = "f9168c5e-ceb2-4faa-b6bf-329bf39fa1e4";
         let u = Uuid::parse_str(uuid_str).unwrap();
-        serde_test::assert_ser_tokens(
-            &u.hyphenated(),
-            &[Token::Str(uuid_str)],
-        );
+        serde_test::assert_ser_tokens(&u.hyphenated(), &[Token::Str(uuid_str)]);
     }
 
     #[test]
@@ -232,31 +327,14 @@ mod serde_tests {
     }
 
     #[test]
-    fn test_serialize_compact() {
+    fn test_serialize_non_human_readable() {
         let uuid_bytes = b"F9168C5E-CEB2-4F";
         let u = Uuid::from_slice(uuid_bytes).unwrap();
         serde_test::assert_tokens(
             &u.compact(),
-            &[
-                serde_test::Token::Tuple { len: 16 },
-                serde_test::Token::U8(uuid_bytes[0]),
-                serde_test::Token::U8(uuid_bytes[1]),
-                serde_test::Token::U8(uuid_bytes[2]),
-                serde_test::Token::U8(uuid_bytes[3]),
-                serde_test::Token::U8(uuid_bytes[4]),
-                serde_test::Token::U8(uuid_bytes[5]),
-                serde_test::Token::U8(uuid_bytes[6]),
-                serde_test::Token::U8(uuid_bytes[7]),
-                serde_test::Token::U8(uuid_bytes[8]),
-                serde_test::Token::U8(uuid_bytes[9]),
-                serde_test::Token::U8(uuid_bytes[10]),
-                serde_test::Token::U8(uuid_bytes[11]),
-                serde_test::Token::U8(uuid_bytes[12]),
-                serde_test::Token::U8(uuid_bytes[13]),
-                serde_test::Token::U8(uuid_bytes[14]),
-                serde_test::Token::U8(uuid_bytes[15]),
-                serde_test::Token::TupleEnd,
-            ],
+            &[serde_test::Token::Bytes(&[
+                70, 57, 49, 54, 56, 67, 53, 69, 45, 67, 69, 66, 50, 45, 52, 70,
+            ])],
         );
     }
 
@@ -269,7 +347,7 @@ mod serde_tests {
 
         serde_test::assert_de_tokens_error::<Compact<Uuid>>(
             &[Token::Bytes(b"hello_world")],
-            "invalid type: byte array, expected an array of length 16",
+            "UUID parsing failed: invalid length: expected 16 bytes, found 11",
         );
     }
 }

src/lib.rs

@@ -293,8 +293,7 @@ pub enum Variant {
 /// * [`hyphenated`](#method.hyphenated):
 ///   `a1a2a3a4-b1b2-c1c2-d1d2-d3d4d5d6d7d8`.
 /// * [`urn`](#method.to_urn): `urn:uuid:A1A2A3A4-B1B2-C1C2-D1D2-D3D4D5D6D7D8`.
-/// * [`braced`](#method.braced):
-///   `{a1a2a3a4-b1b2-c1c2-d1d2-d3d4d5d6d7d8}`.
+/// * [`braced`](#method.braced): `{a1a2a3a4-b1b2-c1c2-d1d2-d3d4d5d6d7d8}`.
 ///
 /// The default representation when formatting a UUID with `Display` is
 /// hyphenated:
@@ -745,6 +744,17 @@ impl AsRef<[u8]> for Uuid {
     }
 }
 
+#[cfg(feature = "serde")]
+pub mod serde {
+    //! Adapters for `serde`.
+    //!
+    //! This module contains adapters you can use with [`#[serde(with)]`](https://serde.rs/field-attrs.html#with)
+    //! to change the way a [`Uuid`](../struct.Uuid.html) is serialized
+    //! and deserialized.
+
+    pub use crate::external::serde_support::compact;
+}
+
 #[cfg(test)]
 mod tests {
     use super::*;

src/parser.rs

@@ -66,12 +66,35 @@ impl Uuid {
             .map_err(InvalidUuid::into_err)
     }
 
-    /// Intended to replace `Uuid::parse_str`
+    /// Parses a `Uuid` from a string of hexadecimal digits with optional
+    /// hyphens.
+    ///
+    /// This function is similar to [`parse_str`], in fact `parse_str` shares
+    /// the same underlying parser. The difference is that if `try_parse`
+    /// fails, it won't generate very useful error messages. The `parse_str`
+    /// function will eventually be deprecated in favor or `try_parse`.
+    ///
+    /// # Examples
+    ///
+    /// Parse a hyphenated UUID:
+    ///
+    /// ```
+    /// # use uuid::{Uuid, Version, Variant};
+    /// # fn main() -> Result<(), Box<dyn std::error::Error>> {
+    /// let uuid = Uuid::try_parse("550e8400-e29b-41d4-a716-446655440000")?;
+    ///
+    /// assert_eq!(Some(Version::Random), uuid.get_version());
+    /// assert_eq!(Variant::RFC4122, uuid.get_variant());
+    /// # Ok(())
+    /// # }
+    /// ```
+    ///
+    /// [`parse_str`]: #method.parse_str
     #[inline]
-    pub const fn try_parse(input: &str) -> Result<Uuid, InvalidUuid> {
+    pub const fn try_parse(input: &str) -> Result<Uuid, Error> {
         match imp::try_parse(input) {
             Ok(bytes) => Ok(Uuid::from_bytes(bytes)),
-            Err(e) => Err(e),
+            Err(_) => Err(Error(ErrorKind::Other)),
         }
     }
 }