row2pgcopy 1.7.0

Simple Serializer for PGCOPY
Documentation 
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//! Struct for TIMESTAMP WITH TIME ZONE

use core::time::Duration;

use std::time::SystemTime;

use serde::ser::Error;
use serde::{Serialize, Serializer};

use postgres_types::{ToSql, Type};

use bytes::BytesMut;

/// A timestamp object for postgresql TIMESTAMP WITH TIME ZONE
#[derive(Debug)]
pub struct Timestampz(SystemTime);

impl Serialize for Timestampz {
    fn serialize<S>(&self, ser: S) -> Result<S::Ok, S::Error>
    where
        S: Serializer,
    {
        let mut buf = BytesMut::with_capacity(8);
        let typ: Type = Type::TIMESTAMPTZ;
        let st: SystemTime = self.0;
        st.to_sql(&typ, &mut buf)
            .map_err(|e| S::Error::custom(format!("unable to convert a system time value: {e}")))?;
        ser.serialize_bytes(&buf)
    }
}

impl From<SystemTime> for Timestampz {
    fn from(st: SystemTime) -> Self {
        Self(st)
    }
}

impl TryFrom<Duration> for Timestampz {
    type Error = String;
    fn try_from(elapsed_from_epoch: Duration) -> Result<Self, Self::Error> {
        let base: SystemTime = SystemTime::UNIX_EPOCH;
        let o: Option<SystemTime> = base.checked_add(elapsed_from_epoch);
        o.map(|s| s.into())
            .ok_or_else(|| String::from("invalid duration"))
    }
}