pub struct CLOCK_SKEW_TOLERANCE { /* private fields */ }
Expand description

The default amount of tolerance to use when comparing some timestamps.

Used by Subpacket::signature_alive.

When determining whether a timestamp generated on another machine is valid now, we need to account for clock skew. (Note: you don’t normally need to consider clock skew when evaluating a signature’s validity at some time in the past.)

We tolerate half an hour of skew based on the following anecdote: In 2019, a developer using Sequoia in a Windows VM running inside of Virtual Box on Mac OS X reported that he typically observed a few minutes of clock skew and occasionally saw over 20 minutes of clock skew.

Note: when new messages override older messages, and their signatures are evaluated at some arbitrary point in time, an application may not see a consistent state if it uses a tolerance. Consider an application that has two messages and wants to get the current message at time te:

  • t0: message 0
  • te: “get current message”
  • t1: message 1

If te is close to t1, then t1 may be considered valid, which is probably not what you want.

Methods from Deref<Target = Duration>§

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pub const SECOND: Duration = _

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pub const MILLISECOND: Duration = _

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pub const MICROSECOND: Duration = _

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pub const NANOSECOND: Duration = _

1.53.0 · source

pub const ZERO: Duration = _

1.53.0 · source

pub const MAX: Duration = _

1.53.0 · source

pub fn is_zero(&self) -> bool

Returns true if this Duration spans no time.

§Examples
use std::time::Duration;

assert!(Duration::ZERO.is_zero());
assert!(Duration::new(0, 0).is_zero());
assert!(Duration::from_nanos(0).is_zero());
assert!(Duration::from_secs(0).is_zero());

assert!(!Duration::new(1, 1).is_zero());
assert!(!Duration::from_nanos(1).is_zero());
assert!(!Duration::from_secs(1).is_zero());
1.3.0 · source

pub fn as_secs(&self) -> u64

Returns the number of whole seconds contained by this Duration.

The returned value does not include the fractional (nanosecond) part of the duration, which can be obtained using subsec_nanos.

§Examples
use std::time::Duration;

let duration = Duration::new(5, 730023852);
assert_eq!(duration.as_secs(), 5);

To determine the total number of seconds represented by the Duration including the fractional part, use as_secs_f64 or as_secs_f32

1.27.0 · source

pub fn subsec_millis(&self) -> u32

Returns the fractional part of this Duration, in whole milliseconds.

This method does not return the length of the duration when represented by milliseconds. The returned number always represents a fractional portion of a second (i.e., it is less than one thousand).

§Examples
use std::time::Duration;

let duration = Duration::from_millis(5432);
assert_eq!(duration.as_secs(), 5);
assert_eq!(duration.subsec_millis(), 432);
1.27.0 · source

pub fn subsec_micros(&self) -> u32

Returns the fractional part of this Duration, in whole microseconds.

This method does not return the length of the duration when represented by microseconds. The returned number always represents a fractional portion of a second (i.e., it is less than one million).

§Examples
use std::time::Duration;

let duration = Duration::from_micros(1_234_567);
assert_eq!(duration.as_secs(), 1);
assert_eq!(duration.subsec_micros(), 234_567);
1.3.0 · source

pub fn subsec_nanos(&self) -> u32

Returns the fractional part of this Duration, in nanoseconds.

This method does not return the length of the duration when represented by nanoseconds. The returned number always represents a fractional portion of a second (i.e., it is less than one billion).

§Examples
use std::time::Duration;

let duration = Duration::from_millis(5010);
assert_eq!(duration.as_secs(), 5);
assert_eq!(duration.subsec_nanos(), 10_000_000);
1.33.0 · source

pub fn as_millis(&self) -> u128

Returns the total number of whole milliseconds contained by this Duration.

§Examples
use std::time::Duration;

let duration = Duration::new(5, 730023852);
assert_eq!(duration.as_millis(), 5730);
1.33.0 · source

pub fn as_micros(&self) -> u128

Returns the total number of whole microseconds contained by this Duration.

§Examples
use std::time::Duration;

let duration = Duration::new(5, 730023852);
assert_eq!(duration.as_micros(), 5730023);
1.33.0 · source

pub fn as_nanos(&self) -> u128

Returns the total number of nanoseconds contained by this Duration.

§Examples
use std::time::Duration;

let duration = Duration::new(5, 730023852);
assert_eq!(duration.as_nanos(), 5730023852);
1.38.0 · source

pub fn as_secs_f64(&self) -> f64

Returns the number of seconds contained by this Duration as f64.

The returned value does include the fractional (nanosecond) part of the duration.

§Examples
use std::time::Duration;

let dur = Duration::new(2, 700_000_000);
assert_eq!(dur.as_secs_f64(), 2.7);
1.38.0 · source

pub fn as_secs_f32(&self) -> f32

Returns the number of seconds contained by this Duration as f32.

The returned value does include the fractional (nanosecond) part of the duration.

§Examples
use std::time::Duration;

let dur = Duration::new(2, 700_000_000);
assert_eq!(dur.as_secs_f32(), 2.7);
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pub fn as_millis_f64(&self) -> f64

🔬This is a nightly-only experimental API. (duration_millis_float)

Returns the number of milliseconds contained by this Duration as f64.

The returned value does include the fractional (nanosecond) part of the duration.

§Examples
#![feature(duration_millis_float)]
use std::time::Duration;

let dur = Duration::new(2, 345_678_000);
assert_eq!(dur.as_millis_f64(), 2345.678);
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pub fn as_millis_f32(&self) -> f32

🔬This is a nightly-only experimental API. (duration_millis_float)

Returns the number of milliseconds contained by this Duration as f32.

The returned value does include the fractional (nanosecond) part of the duration.

§Examples
#![feature(duration_millis_float)]
use std::time::Duration;

let dur = Duration::new(2, 345_678_000);
assert_eq!(dur.as_millis_f32(), 2345.678);

Trait Implementations§

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impl Deref for CLOCK_SKEW_TOLERANCE

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type Target = Duration

The resulting type after dereferencing.
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fn deref(&self) -> &Duration

Dereferences the value.
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impl LazyStatic for CLOCK_SKEW_TOLERANCE

Auto Trait Implementations§

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impl<T> Any for T
where T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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impl<T> Borrow<T> for T
where T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for T
where T: ?Sized,

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fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T, U> Into<U> for T
where U: From<T>,

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fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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impl<T> Same for T

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type Output = T

Should always be Self
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impl<T, U> TryFrom<U> for T
where U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

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type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.