mirror of
https://github.com/pezkuwichain/pezkuwi-subxt.git
synced 2026-06-29 11:27:24 +00:00
Shawn Tabrizi
63 lines
2.1 KiB
Rust
63 lines
2.1 KiB
Rust
// Copyright 2019-2020 Parity Technologies (UK) Ltd.
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// This file is part of Substrate.
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// Substrate is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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// Substrate is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// You should have received a copy of the GNU General Public License
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// along with Substrate. If not, see <http://www.gnu.org/licenses/>.
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//! Helper methods dedicated to timestamps.
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use sp_core::offchain::Timestamp;
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use std::convert::TryInto;
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use std::time::{SystemTime, Duration};
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/// Returns the current time as a `Timestamp`.
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pub fn now() -> Timestamp {
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let now = SystemTime::now();
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let epoch_duration = now.duration_since(SystemTime::UNIX_EPOCH);
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match epoch_duration {
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Err(_) => {
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// Current time is earlier than UNIX_EPOCH.
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Timestamp::from_unix_millis(0)
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},
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Ok(d) => {
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let duration = d.as_millis();
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// Assuming overflow won't happen for a few hundred years.
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Timestamp::from_unix_millis(duration.try_into()
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.expect("epoch milliseconds won't overflow u64 for hundreds of years; qed"))
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}
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}
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}
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/// Returns how a `Timestamp` compares to "now".
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///
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/// In other words, returns `timestamp - now()`.
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pub fn timestamp_from_now(timestamp: Timestamp) -> Duration {
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Duration::from_millis(timestamp.diff(&now()).millis())
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}
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/// Converts the deadline into a `Future` that resolves when the deadline is reached.
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///
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/// If `None`, returns a never-ending `Future`.
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pub fn deadline_to_future(
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deadline: Option<Timestamp>,
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) -> futures::future::MaybeDone<impl futures::Future> {
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use futures::future;
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future::maybe_done(match deadline {
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Some(deadline) => future::Either::Left(
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futures_timer::Delay::new(timestamp_from_now(deadline))
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),
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None => future::Either::Right(future::pending())
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})
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}
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