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Diffstat (limited to 'src/mail/unique_ident.rs')
-rw-r--r-- | src/mail/unique_ident.rs | 101 |
1 files changed, 0 insertions, 101 deletions
diff --git a/src/mail/unique_ident.rs b/src/mail/unique_ident.rs deleted file mode 100644 index 0e629db..0000000 --- a/src/mail/unique_ident.rs +++ /dev/null @@ -1,101 +0,0 @@ -use std::str::FromStr; -use std::sync::atomic::{AtomicU64, Ordering}; - -use lazy_static::lazy_static; -use rand::prelude::*; -use serde::{de::Error, Deserialize, Deserializer, Serialize, Serializer}; - -use crate::timestamp::now_msec; - -/// An internal Mail Identifier 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 -/// They are not part of the protocol but an internal representation -/// required by Aerogramme. -/// Their main property is to be unique without having to rely -/// on synchronization between IMAP processes. -#[derive(Clone, Copy, PartialOrd, Ord, PartialEq, Eq, Hash)] -pub struct UniqueIdent(pub [u8; 24]); - -struct IdentGenerator { - pid: u128, - sn: AtomicU64, -} - -impl IdentGenerator { - 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) -> UniqueIdent { - 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)); - UniqueIdent(res) - } -} - -lazy_static! { - static ref GENERATOR: IdentGenerator = IdentGenerator::new(); -} - -pub fn gen_ident() -> UniqueIdent { - GENERATOR.gen() -} - -// -- serde -- - -impl<'de> Deserialize<'de> for UniqueIdent { - fn deserialize<D>(d: D) -> Result<Self, D::Error> - where - D: Deserializer<'de>, - { - let v = String::deserialize(d)?; - UniqueIdent::from_str(&v).map_err(D::Error::custom) - } -} - -impl Serialize for UniqueIdent { - fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error> - where - S: Serializer, - { - serializer.serialize_str(&self.to_string()) - } -} - -impl std::fmt::Display for UniqueIdent { - fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result { - write!(f, "{}", hex::encode(self.0)) - } -} - -impl std::fmt::Debug for UniqueIdent { - fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result { - write!(f, "{}", hex::encode(self.0)) - } -} - -impl FromStr for UniqueIdent { - type Err = &'static str; - - fn from_str(s: &str) -> Result<UniqueIdent, &'static str> { - let bytes = hex::decode(s).map_err(|_| "invalid hex")?; - - if bytes.len() != 24 { - return Err("bad length"); - } - - let mut tmp = [0u8; 24]; - tmp[..].copy_from_slice(&bytes); - Ok(UniqueIdent(tmp)) - } -} |