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clock.go
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clock.go
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// Copyright 2023 The glassdb Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package testkit
import (
"context"
"testing"
"time"
"github.com/jonboulle/clockwork"
)
func NewSelfAdvanceClock(t *testing.T) clockwork.Clock {
c := clockwork.NewFakeClock()
ctx, cancel := context.WithCancel(context.Background())
t.Cleanup(cancel)
go func() {
for {
if err := ctx.Err(); err != nil {
return
}
c.BlockUntil(1)
c.Advance(100 * time.Millisecond)
// Wait some real time before advancing again.
// This allows sleepers to start running.
time.Sleep(100 * time.Microsecond)
}
}()
return c
}
func NewAcceleratedClock(multiplier int) clockwork.Clock {
c := clockwork.NewRealClock()
return aclock{
inner: c,
multiplier: multiplier,
epoch: c.Now(),
}
}
type aclock struct {
inner clockwork.Clock
multiplier int
epoch time.Time
}
func (c aclock) After(d time.Duration) <-chan time.Time {
return c.inner.After(c.compress(d))
}
func (c aclock) Sleep(d time.Duration) {
c.inner.Sleep(c.compress(d))
}
func (c aclock) Now() time.Time {
since := c.inner.Since(c.epoch)
return c.epoch.Add(c.expand(since))
}
func (c aclock) Since(t time.Time) time.Duration {
return c.Now().Sub(t)
}
func (c aclock) NewTicker(d time.Duration) clockwork.Ticker {
return c.inner.NewTicker(c.compress(d))
}
func (c aclock) NewTimer(d time.Duration) clockwork.Timer {
return atimer{
Timer: c.inner.NewTimer(c.compress(d)),
multiplier: c.multiplier,
}
}
func (c aclock) AfterFunc(d time.Duration, fn func()) clockwork.Timer {
d = c.compress(d)
t := c.inner.AfterFunc(d, fn)
return atimer{
Timer: t,
multiplier: c.multiplier,
}
}
func (c aclock) compress(d time.Duration) time.Duration {
return d / time.Duration(c.multiplier)
}
func (c aclock) expand(d time.Duration) time.Duration {
return d * time.Duration(c.multiplier)
}
type atimer struct {
clockwork.Timer
multiplier int
}
func (t atimer) Reset(d time.Duration) bool {
return t.Timer.Reset(d / time.Duration(t.multiplier))
}
// Make sure the Clock interface is implemented correctly.
var _ clockwork.Clock = (*aclock)(nil)