retry_with_deadline.go

Documentation: k8s.io/client-go/tools/cache

     1  /*
     2  Copyright 2022 The Kubernetes Authors.
     3  
     4  Licensed under the Apache License, Version 2.0 (the "License");
     5  you may not use this file except in compliance with the License.
     6  You may obtain a copy of the License at
     7  
     8      http://www.apache.org/licenses/LICENSE-2.0
     9  
    10  Unless required by applicable law or agreed to in writing, software
    11  distributed under the License is distributed on an "AS IS" BASIS,
    12  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13  See the License for the specific language governing permissions and
    14  limitations under the License.
    15  */
    16  
    17  package cache
    18  
    19  import (
    20  	"k8s.io/utils/clock"
    21  	"time"
    22  )
    23  
    24  type RetryWithDeadline interface {
    25  	After(error)
    26  	ShouldRetry() bool
    27  }
    28  
    29  type retryWithDeadlineImpl struct {
    30  	firstErrorTime   time.Time
    31  	lastErrorTime    time.Time
    32  	maxRetryDuration time.Duration
    33  	minResetPeriod   time.Duration
    34  	isRetryable      func(error) bool
    35  	clock            clock.Clock
    36  }
    37  
    38  func NewRetryWithDeadline(maxRetryDuration, minResetPeriod time.Duration, isRetryable func(error) bool, clock clock.Clock) RetryWithDeadline {
    39  	return &retryWithDeadlineImpl{
    40  		firstErrorTime:   time.Time{},
    41  		lastErrorTime:    time.Time{},
    42  		maxRetryDuration: maxRetryDuration,
    43  		minResetPeriod:   minResetPeriod,
    44  		isRetryable:      isRetryable,
    45  		clock:            clock,
    46  	}
    47  }
    48  
    49  func (r *retryWithDeadlineImpl) reset() {
    50  	r.firstErrorTime = time.Time{}
    51  	r.lastErrorTime = time.Time{}
    52  }
    53  
    54  func (r *retryWithDeadlineImpl) After(err error) {
    55  	if r.isRetryable(err) {
    56  		if r.clock.Now().Sub(r.lastErrorTime) >= r.minResetPeriod {
    57  			r.reset()
    58  		}
    59  
    60  		if r.firstErrorTime.IsZero() {
    61  			r.firstErrorTime = r.clock.Now()
    62  		}
    63  		r.lastErrorTime = r.clock.Now()
    64  	}
    65  }
    66  
    67  func (r *retryWithDeadlineImpl) ShouldRetry() bool {
    68  	if r.maxRetryDuration <= time.Duration(0) {
    69  		return false
    70  	}
    71  
    72  	if r.clock.Now().Sub(r.firstErrorTime) <= r.maxRetryDuration {
    73  		return true
    74  	}
    75  
    76  	r.reset()
    77  	return false
    78  }
    79
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