github.com/polarismesh/polaris@v1.17.8/service/healthcheck/time_adjust.go (about)

     1  /**
     2   * Tencent is pleased to support the open source community by making Polaris available.
     3   *
     4   * Copyright (C) 2019 THL A29 Limited, a Tencent company. All rights reserved.
     5   *
     6   * Licensed under the BSD 3-Clause License (the "License");
     7   * you may not use this file except in compliance with the License.
     8   * You may obtain a copy of the License at
     9   *
    10   * https://opensource.org/licenses/BSD-3-Clause
    11   *
    12   * Unless required by applicable law or agreed to in writing, software distributed
    13   * under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
    14   * CONDITIONS OF ANY KIND, either express or implied. See the License for the
    15   * specific language governing permissions and limitations under the License.
    16   */
    17  
    18  package healthcheck
    19  
    20  import (
    21  	"context"
    22  	"sync/atomic"
    23  	"time"
    24  
    25  	"github.com/polarismesh/polaris/store"
    26  )
    27  
    28  const adjustInterval = 60 * time.Second
    29  
    30  // TimeAdjuster adjust the seconds from databases
    31  type TimeAdjuster struct {
    32  	diff    int64
    33  	storage store.Store
    34  }
    35  
    36  func newTimeAdjuster(ctx context.Context, storage store.Store) *TimeAdjuster {
    37  	adjuster := &TimeAdjuster{storage: storage}
    38  	return adjuster
    39  }
    40  
    41  func (t *TimeAdjuster) doTimeAdjust(ctx context.Context) {
    42  	t.calcDiff()
    43  	ticker := time.NewTicker(adjustInterval)
    44  	defer ticker.Stop()
    45  	for {
    46  		select {
    47  		case <-ctx.Done():
    48  			log.Infof("[Health Check] time adjuster has been stopped")
    49  			return
    50  		case <-ticker.C:
    51  			t.calcDiff()
    52  		}
    53  	}
    54  }
    55  
    56  func (t *TimeAdjuster) calcDiff() {
    57  	curTimeSecond, err := t.storage.GetUnixSecond(time.Second)
    58  	if err != nil {
    59  		log.Errorf("[Health Check] fail to get now from store, err is %s", err.Error())
    60  		return
    61  	}
    62  	if curTimeSecond == 0 {
    63  		return
    64  	}
    65  	sysNow := time.Now().Unix()
    66  	diff := sysNow - curTimeSecond
    67  	if diff != 0 {
    68  		log.Infof("[Health Check] time diff from now is %d", diff)
    69  	}
    70  	atomic.StoreInt64(&t.diff, diff)
    71  }
    72  
    73  // GetDiff get diff time between store and current PC
    74  func (t *TimeAdjuster) GetDiff() int64 {
    75  	if nil == t {
    76  		return 0
    77  	}
    78  	return atomic.LoadInt64(&t.diff)
    79  }