Albirew/nyaa-pantsu
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nyaa-pantsu/vendor/gopkg.in/olivere/elastic.v5/retry.go
akuma06 a41f938cec Add Godep support (#758)
As we have seen, dependencies version can prevent the build. We should
user lock versions on dependencies that we know work:
* Packages are vendored
* Add Godep support
* Added addtional install step in readme
* Fix travis build error
2017-05-26 13:07:22 +02:00

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1,5 Kio
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// Copyright 2012-present Oliver Eilhard. All rights reserved.
// Use of this source code is governed by a MIT-license.
// See http://olivere.mit-license.org/license.txt for details.
// This file is based on code (c) 2014 Cenk Altı and governed by the MIT license.
// See https://github.com/cenkalti/backoff for original source.
package elastic
import "time"
// An Operation is executing by Retry() or RetryNotify().
// The operation will be retried using a backoff policy if it returns an error.
type Operation func() error
// Notify is a notify-on-error function. It receives error returned
// from an operation.
//
// Notice that if the backoff policy stated to stop retrying,
// the notify function isn't called.
type Notify func(error)
// Retry the function f until it does not return error or BackOff stops.
// f is guaranteed to be run at least once.
// It is the caller's responsibility to reset b after Retry returns.
//
// Retry sleeps the goroutine for the duration returned by BackOff after a
// failed operation returns.
func Retry(o Operation, b Backoff) error { return RetryNotify(o, b, nil) }
// RetryNotify calls notify function with the error and wait duration
// for each failed attempt before sleep.
func RetryNotify(operation Operation, b Backoff, notify Notify) error {
var err error
var wait time.Duration
var retry bool
var n int
for {
if err = operation(); err == nil {
return nil
}
n++
wait, retry = b.Next(n)
if !retry {
return err
}
if notify != nil {
notify(err)
}
time.Sleep(wait)
}
}