mirror of
https://github.com/superseriousbusiness/gotosocial.git
synced 2025-11-03 20:22:25 -06:00
436765a6a2
Reviewed-on: https://codeberg.org/superseriousbusiness/gotosocial/pulls/4075 Co-authored-by: kim <grufwub@gmail.com> Co-committed-by: kim <grufwub@gmail.com>
65 lines
1.8 KiB
Go
65 lines
1.8 KiB
Go
/*
|
|
* MinIO Go Library for Amazon S3 Compatible Cloud Storage
|
|
* Copyright 2015-2017 MinIO, Inc.
|
|
*
|
|
* 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 minio
|
|
|
|
import (
|
|
"iter"
|
|
"math"
|
|
"time"
|
|
)
|
|
|
|
// newRetryTimerContinous creates a timer with exponentially increasing delays forever.
|
|
func (c *Client) newRetryTimerContinous(baseSleep, maxSleep time.Duration, jitter float64) iter.Seq[int] {
|
|
// normalize jitter to the range [0, 1.0]
|
|
if jitter < NoJitter {
|
|
jitter = NoJitter
|
|
}
|
|
if jitter > MaxJitter {
|
|
jitter = MaxJitter
|
|
}
|
|
|
|
// computes the exponential backoff duration according to
|
|
// https://www.awsarchitectureblog.com/2015/03/backoff.html
|
|
exponentialBackoffWait := func(attempt int) time.Duration {
|
|
// 1<<uint(attempt) below could overflow, so limit the value of attempt
|
|
maxAttempt := 30
|
|
if attempt > maxAttempt {
|
|
attempt = maxAttempt
|
|
}
|
|
// sleep = random_between(0, min(maxSleep, base * 2 ** attempt))
|
|
sleep := baseSleep * time.Duration(1<<uint(attempt))
|
|
if sleep > maxSleep {
|
|
sleep = maxSleep
|
|
}
|
|
if math.Abs(jitter-NoJitter) > 1e-9 {
|
|
sleep -= time.Duration(c.random.Float64() * float64(sleep) * jitter)
|
|
}
|
|
return sleep
|
|
}
|
|
|
|
return func(yield func(int) bool) {
|
|
var nextBackoff int
|
|
for {
|
|
if !yield(nextBackoff) {
|
|
return
|
|
}
|
|
nextBackoff++
|
|
time.Sleep(exponentialBackoffWait(nextBackoff))
|
|
}
|
|
}
|
|
}
|