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cleaner.go
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/
cleaner.go
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package internal
import (
"fmt"
"time"
"github.com/wjames2000/go-zero/core/collection"
"github.com/wjames2000/go-zero/core/logx"
"github.com/wjames2000/go-zero/core/proc"
"github.com/wjames2000/go-zero/core/stat"
"github.com/wjames2000/go-zero/core/stringx"
"github.com/wjames2000/go-zero/core/threading"
)
const (
timingWheelSlots = 300
cleanWorkers = 5
taskKeyLen = 8
)
var (
timingWheel *collection.TimingWheel
taskRunner = threading.NewTaskRunner(cleanWorkers)
)
type delayTask struct {
delay time.Duration
task func() error
keys []string
}
func init() {
var err error
timingWheel, err = collection.NewTimingWheel(time.Second, timingWheelSlots, clean)
logx.Must(err)
proc.AddShutdownListener(func() {
timingWheel.Drain(clean)
})
}
func AddCleanTask(task func() error, keys ...string) {
timingWheel.SetTimer(stringx.Randn(taskKeyLen), delayTask{
delay: time.Second,
task: task,
keys: keys,
}, time.Second)
}
func clean(key, value interface{}) {
taskRunner.Schedule(func() {
dt := value.(delayTask)
err := dt.task()
if err == nil {
return
}
next, ok := nextDelay(dt.delay)
if ok {
dt.delay = next
timingWheel.SetTimer(key, dt, next)
} else {
msg := fmt.Sprintf("retried but failed to clear cache with keys: %q, error: %v",
formatKeys(dt.keys), err)
logx.Error(msg)
stat.Report(msg)
}
})
}
func nextDelay(delay time.Duration) (time.Duration, bool) {
switch delay {
case time.Second:
return time.Second * 5, true
case time.Second * 5:
return time.Minute, true
case time.Minute:
return time.Minute * 5, true
case time.Minute * 5:
return time.Hour, true
default:
return 0, false
}
}