add timepoint_from_now to complement timepoint_ago in utils

Signed-off-by: Jason Volk <jason@zemos.net>

src/core/utils/mod.rs

@@ -34,7 +34,7 @@ pub use self::{
 	stream::{IterStream, ReadyExt, Tools as StreamTools, TryReadyExt},
 	string::{str_from_bytes, string_from_bytes},
 	sys::available_parallelism,
-	time::now_millis as millis_since_unix_epoch,
+	time::{now_millis as millis_since_unix_epoch, timepoint_ago, timepoint_from_now},
 };
 
 #[inline]

src/core/utils/time.rs

@@ -22,6 +22,13 @@ pub fn timepoint_ago(duration: Duration) -> Result<SystemTime> {
 		.ok_or_else(|| err!(Arithmetic("Duration {duration:?} is too large")))
 }
 
+#[inline]
+pub fn timepoint_from_now(duration: Duration) -> Result<SystemTime> {
+	SystemTime::now()
+		.checked_add(duration)
+		.ok_or_else(|| err!(Arithmetic("Duration {duration:?} is too large")))
+}
+
 #[inline]
 pub fn parse_duration(duration: &str) -> Result<Duration> {
 	cyborgtime::parse_duration(duration)