3f160ecae8
Removed the `IsValid` check when converting a `RustBuffer` to an `OwnedRustBuffer`. The vendored changes revealed some issues with this logic. See https://bugzilla.mozilla.org/show_bug.cgi?id=1913183#c4 for details. Differential Revision: https://phabricator.services.mozilla.com/D219189
MessagePack + Serde
This crate connects Rust MessagePack library with serde providing an ability to
easily serialize and deserialize both Rust built-in types, the standard library and custom data
structures.
Motivating example
let buf = rmp_serde::to_vec(&(42, "the Answer")).unwrap();
assert_eq!(
vec![0x92, 0x2a, 0xaa, 0x74, 0x68, 0x65, 0x20, 0x41, 0x6e, 0x73, 0x77, 0x65, 0x72],
buf
);
assert_eq!((42, "the Answer"), rmp_serde::from_slice(&buf).unwrap());
Type-based Serialization and Deserialization
Serde provides a mechanism for low boilerplate serialization & deserialization of values to and from MessagePack via the serialization API.
To be able to serialize a piece of data, it must implement the serde::Serialize trait. To be
able to deserialize a piece of data, it must implement the serde::Deserialize trait. Serde
provides an annotation to automatically generate the code for these
traits: #[derive(Serialize, Deserialize)].
Examples
use std::collections::HashMap;
use serde::{Deserialize, Serialize};
use rmp_serde::{Deserializer, Serializer};
#[derive(Debug, PartialEq, Deserialize, Serialize)]
struct Human {
age: u32,
name: String,
}
fn main() {
let mut buf = Vec::new();
let val = Human {
age: 42,
name: "John".into(),
};
val.serialize(&mut Serializer::new(&mut buf)).unwrap();
}
Efficient storage of &[u8] types
MessagePack can efficiently store binary data. However, Serde's standard derived implementations do not use binary representations by default. Serde prefers to represent types like &[u8; N] or Vec<u8> as arrays of objects of arbitrary/unknown type, and not as slices of bytes. This creates about a 50% overhead in storage size.
Wrap your data in serde_bytes to store blobs quickly and efficiently. Alternatively, configure an override in rmp_serde to force use of byte slices.