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