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//! Module containing helper functions to manipulate time
use chrono::{SecondsFormat, TimeZone, Utc};
use std::time::{SystemTime, UNIX_EPOCH};
/// Returns milliseconds since UNIX Epoch
pub fn now_msec() -> u64 {
SystemTime::now()
.duration_since(UNIX_EPOCH)
.expect("Fix your clock :o")
.as_millis() as u64
}
/// Increment logical clock
pub fn increment_logical_clock(prev: u64) -> u64 {
std::cmp::max(prev + 1, now_msec())
}
/// Increment two logical clocks
pub fn increment_logical_clock_2(prev: u64, prev2: u64) -> u64 {
std::cmp::max(prev2 + 1, std::cmp::max(prev + 1, now_msec()))
}
/// Convert a timestamp represented as milliseconds since UNIX Epoch to
/// its RFC3339 representation, such as "2021-01-01T12:30:00Z"
pub fn msec_to_rfc3339(msecs: u64) -> String {
let secs = msecs as i64 / 1000;
let nanos = (msecs as i64 % 1000) as u32 * 1_000_000;
let timestamp = Utc.timestamp(secs, nanos);
timestamp.to_rfc3339_opts(SecondsFormat::Millis, true)
}
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