harmos-domain 0.1.5

Harmos domain model: identifiers, contracts, catalogs and storage identities.
Documentation 
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/* ***
 *
 * Harmos
 *
 * SPDX-License-Identifier: Apache-2.0
 *
 * ***
 */

/* === Modules === */

pub mod optional {
    use super::*;

    pub fn serialize<S: Serializer>(value: &Option<Timestamp>, serializer: S) -> Result<S::Ok, S::Error> {
        value.map(Wire::from).serialize(serializer)
    }

    pub fn deserialize<'de, D: Deserializer<'de>>(deserializer: D) -> Result<Option<Timestamp>, D::Error> {
        Option::<Wire>::deserialize(deserializer)?.map(Wire::timestamp).transpose().map_err(serde::de::Error::custom)
    }
}

/* === Re-Exports === */

/* === Imports === */

// Standard Library Imports
use std::time::{Duration, SystemTime as Timestamp, UNIX_EPOCH};
// Third Party Imports
use serde::{Deserialize, Deserializer, Serialize, Serializer};
// Local Imports

/* === Constants === */

/* === Macros === */

/* === Type Aliases === */

/* === Structs === */

#[derive(Serialize, Deserialize)]
#[serde(deny_unknown_fields)]
pub struct Wire {
    pub(crate) secs_since_epoch: u64,
    pub(crate) nanos_since_epoch: u32,

    #[serde(default, skip_serializing_if = "is_false")]
    pub(crate) before_epoch: bool,
}

/* === Enums === */

/* === Traits === */

/* === Implementations === */

impl From<Timestamp> for Wire {
    fn from(value: Timestamp) -> Self {
        let (duration, before_epoch) = match value.duration_since(UNIX_EPOCH) {
            Ok(duration) => (duration, false),
            Err(error) => (error.duration(), true),
        };

        Self { secs_since_epoch: duration.as_secs(), nanos_since_epoch: duration.subsec_nanos(), before_epoch }
    }
}

impl Wire {
    pub fn timestamp(self) -> Result<Timestamp, &'static str> {
        if self.nanos_since_epoch >= 1_000_000_000 {
            return Err("invalid source timestamp nanoseconds");
        }
        let duration = Duration::new(self.secs_since_epoch, self.nanos_since_epoch);
        let timestamp = if self.before_epoch {
            if duration.is_zero() {
                return Err("invalid negative zero timestamp");
            }
            UNIX_EPOCH.checked_sub(duration)
        } else {
            UNIX_EPOCH.checked_add(duration)
        };

        timestamp.ok_or("source timestamp outside platform range")
    }
}

/* === Public Functions === */

/* === Private Functions === */

fn is_false(value: &bool) -> bool {
    !*value
}

/* === Tests === */