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timemarker.go
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timemarker.go
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// Copyright (c) 2017 VMware, 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 utils
import (
"os"
"strconv"
"sync"
"time"
)
var (
scanAllMarker *TimeMarker
scanOverviewMarker = &TimeMarker{
interval: 15 * time.Second,
}
once sync.Once
)
//TimeMarker is used to control an action not to be taken frequently within the interval
type TimeMarker struct {
sync.RWMutex
next time.Time
interval time.Duration
}
//Mark tries to mark a future time, which is after the duration of interval from the time it's called.
func (t *TimeMarker) Mark() {
t.Lock()
defer t.Unlock()
t.next = time.Now().Add(t.interval)
}
//Check returns true if the current time is after the mark by this marker, and the caction the mark guards and be taken.
func (t *TimeMarker) Check() bool {
t.RLock()
defer t.RUnlock()
return time.Now().After(t.next)
}
//Next returns the time of the next mark.
func (t *TimeMarker) Next() time.Time {
t.RLock()
defer t.RUnlock()
return t.next
}
//ScanAllMarker ...
func ScanAllMarker() *TimeMarker {
once.Do(func() {
a := os.Getenv("HARBOR_SCAN_ALL_INTERVAL")
if m, err := strconv.Atoi(a); err == nil {
scanAllMarker = &TimeMarker{
interval: time.Duration(m) * time.Minute,
}
} else {
scanAllMarker = &TimeMarker{
interval: 2 * time.Hour,
}
}
})
return scanAllMarker
}
//ScanOverviewMarker ...
func ScanOverviewMarker() *TimeMarker {
return scanOverviewMarker
}