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mocktime.go
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mocktime.go
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// Copyright (c) 2020 Tigera, Inc. All rights reserved.
//
// 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 mocktime
import (
"sort"
"sync"
"time"
"github.com/sirupsen/logrus"
"github.com/dtest11/calico/felix/timeshim"
)
var StartTime, _ = time.Parse(time.RFC3339, "2006-01-02T15:04:05Z")
var StartKTime = 1000 * time.Hour
var KTimeEpoch = StartTime.Add(-StartKTime)
func New() *MockTime {
return &MockTime{
currentTime: StartTime,
}
}
var _ timeshim.Interface = (*MockTime)(nil)
type MockTime struct {
lock sync.Mutex
currentTime time.Time
autoIncrement time.Duration
timers []*mockTimer
}
func (m *MockTime) NewTimer(d timeshim.Duration) timeshim.Timer {
timer := &mockTimer{
mockTime: m,
C: make(chan time.Time, 1), // Capacity 1 so we don't block on firing,
}
m.scheduleTimer(timer, d) // Takes the lock.
return timer
}
type mockTimer struct {
mockTime *MockTime
TimeToFire time.Time
C chan time.Time
}
func (m *mockTimer) fire() {
select {
case m.C <- m.TimeToFire: // Should never block since there channel has cap 1.
default:
logrus.Panic("Blocked while trying to fire timer")
}
}
func (m *mockTimer) Stop() bool {
return m.mockTime.stopTimer(m)
}
func (m *mockTimer) Reset(duration timeshim.Duration) {
m.mockTime.scheduleTimer(m, duration)
}
func (m *mockTimer) Chan() <-chan timeshim.Time {
return m.C
}
func (m *MockTime) Until(t time.Time) time.Duration {
return t.Sub(m.Now())
}
func (m *MockTime) After(t time.Duration) <-chan time.Time {
timer := m.NewTimer(t)
return timer.Chan()
}
func (m *MockTime) scheduleTimer(timer *mockTimer, duration time.Duration) {
m.lock.Lock()
defer m.lock.Unlock()
timer.TimeToFire = m.currentTime.Add(duration)
m.timers = append(m.timers, timer)
}
func (m *MockTime) stopTimer(timer *mockTimer) bool {
m.lock.Lock()
defer m.lock.Unlock()
// Look for the timer in the queue; if we find it then we successfully stopped the timer.
// Otherwise, the timer must have fired.
timerWasPending := false
timers := m.timers[:0]
for _, t := range m.timers {
if t == timer {
// Timer was in the queue
timerWasPending = true
continue
}
timers = append(timers, t)
}
m.timers = timers
return timerWasPending
}
func (m *MockTime) Now() time.Time {
m.lock.Lock()
defer m.lock.Unlock()
t := m.currentTime
m.incrementTimeLockHeld(m.autoIncrement)
return t
}
func (m *MockTime) KTimeNanos() int64 {
m.lock.Lock()
defer m.lock.Unlock()
// Kernel time isn't necessarily coupled to the same epoch so use a different one.
return int64(m.currentTime.Sub(KTimeEpoch))
}
func (m *MockTime) Since(t time.Time) time.Duration {
return m.Now().Sub(t)
}
func (m *MockTime) SetAutoIncrement(t time.Duration) {
m.autoIncrement = t
}
func (m *MockTime) IncrementTime(t time.Duration) {
m.lock.Lock()
defer m.lock.Unlock()
m.incrementTimeLockHeld(t)
}
func (m *MockTime) HasTimers() bool {
m.lock.Lock()
defer m.lock.Unlock()
return len(m.timers) > 0
}
func (m *MockTime) incrementTimeLockHeld(t time.Duration) {
if t == 0 {
return
}
m.currentTime = m.currentTime.Add(t)
logrus.WithField("increment", t).WithField("t", m.currentTime.Sub(StartTime)).Info("Incrementing time")
if len(m.timers) == 0 {
return
}
sort.Slice(m.timers, func(i, j int) bool {
return m.timers[i].TimeToFire.Before(m.timers[j].TimeToFire)
})
logrus.WithField("delay", m.timers[0].TimeToFire.Sub(m.currentTime)).Info("Next timer.")
for len(m.timers) > 0 &&
(m.timers[0].TimeToFire.Before(m.currentTime) ||
m.timers[0].TimeToFire.Equal(m.currentTime)) {
logrus.WithField("timer", m.timers[0]).Info("Firing timer.")
m.timers[0].fire()
m.timers = m.timers[1:]
}
}