From d840bbbf64bf9924745b3906947ea480ca80c228 Mon Sep 17 00:00:00 2001
From: Nick Mathewson <nickm@torproject.org>
Date: Tue, 8 Sep 2020 14:01:26 -0400
Subject: [PATCH] TimerangeBound: add functions to extend the tolerances

(This seems much cleaner than baking extra tolerances into the
"true" validity intervals")
---
 tor-checkable/src/timed.rs | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/tor-checkable/src/timed.rs b/tor-checkable/src/timed.rs
index 168d10e10..68a7f9e68 100644
--- a/tor-checkable/src/timed.rs
+++ b/tor-checkable/src/timed.rs
@@ -54,6 +54,19 @@ impl<T> TimerangeBound<T> {
         let end = unwrap_bound(range.end_bound());
         Self { obj, start, end }
     }
+
+    /// Adjust this time-range bound to tolerate an expiration time farther
+    /// in the future.
+    pub fn extend_tolerance(self, d: time::Duration) -> Self {
+        let end = self.end.map(|t| t + d);
+        Self { end, ..self }
+    }
+    /// Adjust this time-range bound to tolerate an initial validity
+    /// time farther in the past.
+    pub fn extend_pre_tolerance(self, d: time::Duration) -> Self {
+        let start = self.start.map(|t| t - d);
+        Self { start, ..self }
+    }
 }
 
 impl<T> crate::Timebound<T> for TimerangeBound<T> {