rust_asio 0.1.0

Asynchronous I/O Library
Documentation 
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use std::mem;
use std::time::Duration;
use time;
use ops::*;

#[derive(Clone, Copy, Ord, PartialOrd, Eq, PartialEq, Hash)]
pub struct Expiry(Duration);

impl Expiry {
    pub fn now() -> Expiry {
        Expiry((time::SteadyTime::now() - time::SteadyTime::zero()).to_std().unwrap())
    }

    pub fn default() -> Expiry {
        Expiry(Duration::new(0, 0))
    }

    pub fn max_value() -> Expiry {
        Expiry(Duration::new(u64::max_value(), 0))
    }

    // pub fn wait_duration(&self, min: Duration) -> Duration {
    //     let now = Self::now().0;
    //     if self.0 > now {
    //         cmp::min(self.0 - now, min)
    //     } else {
    //         Duration::new(0, 0)
    //     }
    // }

    pub fn wait_monotonic_timespec(&self) -> timespec {
        timespec {
            tv_sec: self.0.as_secs() as i64,
            tv_nsec: self.0.subsec_nanos() as i64,
        }
    }
}

pub trait ToExpiry {
    fn zero() -> Self;
    fn now() -> Self;
    fn to_expiry(self) -> Expiry;
}

impl ToExpiry for time::SteadyTime {
    fn zero() -> Self {
        unsafe { mem::zeroed() }
    }

    fn now() -> Self {
        time::SteadyTime::now()
    }

    fn to_expiry(self) -> Expiry {
        match (self - Self::zero()).to_std() {
            Ok(expiry) => Expiry(expiry),
            _          => Expiry::default(),
        }
    }
}

impl ToExpiry for time::Tm {
    fn zero() -> Self {
        time::empty_tm()
    }

    fn now() -> Self {
        time::now()
    }

    fn to_expiry(self) -> Expiry {
        let now = Expiry::now().0;
        match (self - Self::now()).to_std() {
            Ok(expiry) if expiry > now  => Expiry(expiry - now),
            _                           => Expiry::default(),
        }
    }
}