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/*
Copyright The containerd 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 task
import (
"context"
"fmt"
"sync"
"testing"
"time"
)
// TestBackgroundTasks tests background task manager.
func TestBackgroundTasks(t *testing.T) {
doGo := func(f func()) {
invoked := make(chan struct{})
go func() {
invoked <- struct{}{}
f()
}()
<-invoked
time.Sleep(10 * time.Millisecond)
}
wait := func(t *testing.T, name string, done func() bool) {
ch := make(chan struct{})
go func() {
for !done() {
time.Sleep(10 * time.Millisecond)
}
ch <- struct{}{}
}()
select {
case <-ch:
case <-time.After(5 * time.Second):
t.Fatalf("timeout for %q", name)
}
}
tests := []struct {
name string
concurrency int64
checkInterval time.Duration
context func(t *testing.T, pm *BackgroundTaskManager, task1, task2, task3, task4 *sampleTask)
assert func(task1, task2, task3, task4 *sampleTask) bool
}{
{
name: "privilege_running",
concurrency: 1,
checkInterval: 100 * time.Millisecond,
context: func(t *testing.T, pm *BackgroundTaskManager, task1, task2, task3, task4 *sampleTask) {
pm.DoPrioritizedTask()
doGo(func() { pm.InvokeBackgroundTask(task1.do, 24*time.Hour) })
time.Sleep(300 * time.Millisecond) // wait for long time...
},
assert: func(task1, task2, task3, task4 *sampleTask) bool {
return (task1.assert(false, false, false))
},
},
{
name: "concurrency",
concurrency: 2,
checkInterval: time.Duration(0), // We don't care prioritized tasks now
context: func(t *testing.T, pm *BackgroundTaskManager, task1, task2, task3, task4 *sampleTask) {
doGo(func() { pm.InvokeBackgroundTask(task1.do, 24*time.Hour) })
wait(t, "task1 started", task1.checkStarted())
doGo(func() { pm.InvokeBackgroundTask(task2.do, 24*time.Hour) })
wait(t, "task2 started", task2.checkStarted())
doGo(func() { pm.InvokeBackgroundTask(task3.do, 24*time.Hour) })
doGo(func() { pm.InvokeBackgroundTask(task4.do, 24*time.Hour) })
time.Sleep(300 * time.Millisecond) // wait for long time...
},
assert: func(task1, task2, task3, task4 *sampleTask) bool {
return (task1.assert(true, false, false) &&
task2.assert(true, false, false) &&
task3.assert(false, false, false) &&
task4.assert(false, false, false))
},
},
{
name: "cancel",
concurrency: 2,
checkInterval: 100 * time.Millisecond,
context: func(t *testing.T, pm *BackgroundTaskManager, task1, task2, task3, task4 *sampleTask) {
doGo(func() { pm.InvokeBackgroundTask(task1.do, 24*time.Hour) })
wait(t, "task1 started", task1.checkStarted())
doGo(func() { pm.InvokeBackgroundTask(task2.do, 24*time.Hour) })
wait(t, "task2 started", task2.checkStarted())
pm.DoPrioritizedTask()
wait(t, "task1 canceled", task1.checkCanceled())
wait(t, "task2 canceled", task2.checkCanceled())
},
assert: func(task1, task2, task3, task4 *sampleTask) bool {
return (task1.assert(true, false, true) &&
task2.assert(true, false, true))
},
},
{
name: "resume",
concurrency: 2,
checkInterval: 100 * time.Millisecond,
context: func(t *testing.T, pm *BackgroundTaskManager, task1, task2, task3, task4 *sampleTask) {
doGo(func() { pm.InvokeBackgroundTask(task1.do, 24*time.Hour) })
wait(t, "task1 started", task1.checkStarted())
doGo(func() { pm.InvokeBackgroundTask(task2.do, 24*time.Hour) })
wait(t, "task2 started", task2.checkStarted())
pm.DoPrioritizedTask()
wait(t, "task1 canceled", task1.checkCanceled())
wait(t, "task2 canceled", task2.checkCanceled())
task1.reset()
task2.reset()
pm.DonePrioritizedTask()
wait(t, "task1 resumed", task1.checkStarted())
wait(t, "task2 resumed", task2.checkStarted())
},
assert: func(task1, task2, task3, task4 *sampleTask) bool {
return (task1.assert(true, false, false) &&
task2.assert(true, false, false))
},
},
{
name: "finish_partial",
concurrency: 1,
checkInterval: time.Duration(0), // We don't care prioritized tasks now
context: func(t *testing.T, pm *BackgroundTaskManager, task1, task2, task3, task4 *sampleTask) {
doGo(func() { pm.InvokeBackgroundTask(task1.do, 24*time.Hour) })
wait(t, "task1 started", task1.checkStarted())
doGo(func() { pm.InvokeBackgroundTask(task2.do, 24*time.Hour) })
task1.finish()
wait(t, "task1 done", task1.checkDone())
wait(t, "task2 started", task2.checkStarted())
},
assert: func(task1, task2, task3, task4 *sampleTask) bool {
return (task1.assert(true, true, false) &&
task2.assert(true, false, false))
},
},
{
name: "finish_all",
concurrency: 1,
checkInterval: time.Duration(0), // We don't care prioritized tasks now
context: func(t *testing.T, pm *BackgroundTaskManager, task1, task2, task3, task4 *sampleTask) {
doGo(func() { pm.InvokeBackgroundTask(task1.do, 24*time.Hour) })
wait(t, "task1 started", task1.checkStarted())
doGo(func() { pm.InvokeBackgroundTask(task2.do, 24*time.Hour) })
task1.finish()
wait(t, "task1 done", task1.checkDone())
wait(t, "task2 started", task2.checkStarted())
task2.finish()
wait(t, "task2 done", task2.checkDone())
},
assert: func(task1, task2, task3, task4 *sampleTask) bool {
return (task1.assert(true, true, false) &&
task2.assert(true, true, false))
},
},
}
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
var (
pm = NewBackgroundTaskManager(tt.concurrency, tt.checkInterval)
task1 = newSampleTask()
task2 = newSampleTask()
task3 = newSampleTask()
task4 = newSampleTask()
)
tt.context(t, pm, task1, task2, task3, task4)
if !tt.assert(task1, task2, task3, task4) {
t.Errorf("assertion failed:status=(task1:%q,task2:%q,task3:%q,task4:%q)",
task1.dumpStatus(), task2.dumpStatus(),
task3.dumpStatus(), task4.dumpStatus())
}
})
}
}
type sampleTask struct {
started bool
done bool
canceled bool
mu sync.Mutex
finishCh chan struct{}
}
func newSampleTask() *sampleTask {
return &sampleTask{
finishCh: make(chan struct{}),
}
}
func (st *sampleTask) checkStarted() func() bool {
return func() bool {
st.mu.Lock()
defer st.mu.Unlock()
return st.started
}
}
func (st *sampleTask) checkDone() func() bool {
return func() bool {
st.mu.Lock()
defer st.mu.Unlock()
return st.done
}
}
func (st *sampleTask) checkCanceled() func() bool {
return func() bool {
st.mu.Lock()
defer st.mu.Unlock()
return st.canceled
}
}
func (st *sampleTask) do(ctx context.Context) {
st.mu.Lock()
st.started = true
st.mu.Unlock()
select {
case <-st.finishCh:
st.mu.Lock()
st.done = true
st.mu.Unlock()
case <-ctx.Done():
st.mu.Lock()
st.canceled = true
st.mu.Unlock()
}
}
func (st *sampleTask) finish() {
st.finishCh <- struct{}{}
}
func (st *sampleTask) reset() {
st.mu.Lock()
st.started, st.done, st.canceled = false, false, false
st.mu.Unlock()
st.finishCh = make(chan struct{})
}
func (st *sampleTask) dumpStatus() string {
st.mu.Lock()
defer st.mu.Unlock()
return fmt.Sprintf("started=%v,done=%v,canceled=%v", st.started, st.done, st.canceled)
}
func (st *sampleTask) assert(started, done, canceled bool) bool {
st.mu.Lock()
defer st.mu.Unlock()
return (st.started == started) && (st.done == done) && (st.canceled == canceled)
}
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