a2a8d54bb6
This change adds `access` format support for notifications to a Elasticsearch server, and it refactors `namespace` format support. In the case of `access` format, for each event in Minio, a JSON document is inserted into Elasticsearch with its timestamp set to the event's timestamp, and with the ID generated automatically by elasticsearch. No events are modified or deleted in this mode. In the case of `namespace` format, for each event in Minio, a JSON document is keyed together by the bucket and object name is updated in Elasticsearch. In the case of an object being created or over-written in Minio, a new document or an existing document is inserted into the Elasticsearch index. If an object is deleted in Minio, the corresponding document is deleted from the Elasticsearch index. Additionally, this change upgrades Elasticsearch support to the 5.x series. This is a breaking change, and users of previous elasticsearch versions should upgrade. Also updates documentation on Elasticsearch notification target usage and has a link to an elasticsearch upgrade guide. This is the last patch that finally resolves #3928.
56 lines
1.5 KiB
Go
56 lines
1.5 KiB
Go
// 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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