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#![doc(
html_logo_url = "https://raw.githubusercontent.com/maidsafe/QA/master/Images/maidsafe_logo.png",
html_favicon_url = "https://maidsafe.net/img/favicon.ico",
test(attr(forbid(warnings)))
)]
#![forbid(
bad_style,
arithmetic_overflow,
mutable_transmutes,
no_mangle_const_items,
unknown_crate_types,
warnings
)]
#![deny(
deprecated,
improper_ctypes,
missing_docs,
non_shorthand_field_patterns,
overflowing_literals,
stable_features,
unconditional_recursion,
unknown_lints,
unsafe_code,
unused,
unused_allocation,
unused_attributes,
unused_comparisons,
unused_features,
unused_parens,
while_true
)]
#![warn(
trivial_casts,
trivial_numeric_casts,
unused_extern_crates,
unused_import_braces,
unused_qualifications,
unused_results
)]
#![allow(
box_pointers,
missing_copy_implementations,
missing_debug_implementations,
variant_size_differences
)]
use std::cell::Cell;
use std::convert::TryInto;
use std::fmt;
use std::ops::{Add, Sub};
use std::time::Duration;
#[derive(Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Hash)]
pub struct FakeClock {
time_created: u64,
}
thread_local! {
static LOCAL_TIME: Cell<u64> = Cell::new(0);
}
impl FakeClock {
pub fn set_time(time: u64) {
LOCAL_TIME.with(|t| {
t.set(time);
});
}
pub fn advance_time(millis: u64) {
LOCAL_TIME.with(|t| {
t.set(t.get() + millis);
});
}
pub fn time() -> u64 {
LOCAL_TIME.with(|t| t.get())
}
pub fn now() -> Self {
let time = Self::time();
Self { time_created: time }
}
pub fn duration_since(self, earlier: Self) -> Duration {
Duration::from_millis(self.time_created - earlier.time_created)
}
pub fn elapsed(self) -> Duration {
Duration::from_millis(Self::time() - self.time_created)
}
pub fn checked_add(&self, duration: Duration) -> Option<FakeClock> {
duration
.as_millis()
.checked_add(self.time_created as u128)
.and_then(|time| time.try_into().ok())
.map(|time| Self { time_created: time })
}
pub fn checked_sub(&self, duration: Duration) -> Option<FakeClock> {
duration
.as_millis()
.try_into()
.ok()
.and_then(|dur| self.time_created.checked_sub(dur))
.map(|time| Self { time_created: time })
}
}
impl fmt::Debug for FakeClock {
fn fmt(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
write!(
formatter,
"FakeClock {{ time_created: {} }}",
self.time_created
)
}
}
impl Add<Duration> for FakeClock {
type Output = Self;
fn add(mut self, other: Duration) -> FakeClock {
self.time_created += other.as_millis() as u64;
self
}
}
impl Sub<Duration> for FakeClock {
type Output = Self;
fn sub(mut self, other: Duration) -> FakeClock {
self.time_created -= other.as_millis() as u64;
self
}
}
impl Sub<FakeClock> for FakeClock {
type Output = Duration;
fn sub(self, other: FakeClock) -> Duration {
Duration::from_millis(self.time_created - other.time_created)
}
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn test_checked_add_some() {
FakeClock::set_time(0);
let inst = FakeClock::now();
let dur = Duration::from_millis(std::u64::MAX);
FakeClock::set_time(std::u64::MAX);
assert_eq!(Some(FakeClock::now()), inst.checked_add(dur));
}
#[test]
fn test_checked_add_none() {
FakeClock::set_time(1);
let inst = FakeClock::now();
let dur = Duration::from_millis(std::u64::MAX);
assert_eq!(None, inst.checked_add(dur));
}
#[test]
fn test_checked_sub_some() {
FakeClock::set_time(std::u64::MAX);
let inst = FakeClock::now();
let dur = Duration::from_millis(std::u64::MAX);
FakeClock::set_time(0);
assert_eq!(Some(FakeClock::now()), inst.checked_sub(dur));
}
#[test]
fn test_checked_sub_none() {
FakeClock::set_time(std::u64::MAX - 1);
let inst = FakeClock::now();
let dur = Duration::from_millis(std::u64::MAX);
assert_eq!(None, inst.checked_sub(dur));
}
}