77 lines
1.9 KiB
Rust
77 lines
1.9 KiB
Rust
use std::sync::atomic::{AtomicU64, Ordering};
|
|
|
|
use lazy_static::lazy_static;
|
|
use rand::prelude::*;
|
|
use serde::{de::Error, Deserialize, Deserializer, Serialize, Serializer};
|
|
|
|
use crate::time::now_msec;
|
|
|
|
/// A Mail UUID is composed of two components:
|
|
/// - a process identifier, 128 bits, itself composed of:
|
|
/// - the timestamp of when the process started, 64 bits
|
|
/// - a 64-bit random number
|
|
/// - a sequence number, 64 bits
|
|
#[derive(Clone, Copy, PartialOrd, Ord, PartialEq, Eq, Debug)]
|
|
pub struct MailUuid(pub [u8; 24]);
|
|
|
|
struct UuidGenerator {
|
|
pid: u128,
|
|
sn: AtomicU64,
|
|
}
|
|
|
|
impl UuidGenerator {
|
|
fn new() -> Self {
|
|
let time = now_msec() as u128;
|
|
let rand = thread_rng().gen::<u64>() as u128;
|
|
Self {
|
|
pid: (time << 64) | rand,
|
|
sn: AtomicU64::new(0),
|
|
}
|
|
}
|
|
|
|
fn gen(&self) -> MailUuid {
|
|
let sn = self.sn.fetch_add(1, Ordering::Relaxed);
|
|
let mut res = [0u8; 24];
|
|
res[0..16].copy_from_slice(&u128::to_be_bytes(self.pid));
|
|
res[16..24].copy_from_slice(&u64::to_be_bytes(sn));
|
|
MailUuid(res)
|
|
}
|
|
}
|
|
|
|
lazy_static! {
|
|
static ref GENERATOR: UuidGenerator = UuidGenerator::new();
|
|
}
|
|
|
|
pub fn gen_uuid() -> MailUuid {
|
|
GENERATOR.gen()
|
|
}
|
|
|
|
// -- serde --
|
|
|
|
impl<'de> Deserialize<'de> for MailUuid {
|
|
fn deserialize<D>(d: D) -> Result<Self, D::Error>
|
|
where
|
|
D: Deserializer<'de>,
|
|
{
|
|
let v = String::deserialize(d)?;
|
|
let bytes = hex::decode(v).map_err(|_| D::Error::custom("invalid hex"))?;
|
|
|
|
if bytes.len() != 24 {
|
|
return Err(D::Error::custom("bad length"));
|
|
}
|
|
|
|
let mut tmp = [0u8; 24];
|
|
tmp[..].copy_from_slice(&bytes);
|
|
Ok(Self(tmp))
|
|
}
|
|
}
|
|
|
|
impl Serialize for MailUuid {
|
|
fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
|
|
where
|
|
S: Serializer,
|
|
{
|
|
serializer.serialize_str(&hex::encode(self.0))
|
|
}
|
|
}
|