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61 lines
2.0 KiB
61 lines
2.0 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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package elastic |
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import ( |
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"context" |
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"net/http" |
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"time" |
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) |
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// RetrierFunc specifies the signature of a Retry function. |
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type RetrierFunc func(context.Context, int, *http.Request, *http.Response, error) (time.Duration, bool, error) |
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// Retrier decides whether to retry a failed HTTP request with Elasticsearch. |
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type Retrier interface { |
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// Retry is called when a request has failed. It decides whether to retry |
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// the call, how long to wait for the next call, or whether to return an |
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// error (which will be returned to the service that started the HTTP |
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// request in the first place). |
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// |
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// Callers may also use this to inspect the HTTP request/response and |
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// the error that happened. Additional data can be passed through via |
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// the context. |
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Retry(ctx context.Context, retry int, req *http.Request, resp *http.Response, err error) (time.Duration, bool, error) |
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} |
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// -- StopRetrier -- |
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// StopRetrier is an implementation that does no retries. |
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type StopRetrier struct { |
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} |
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// NewStopRetrier returns a retrier that does no retries. |
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func NewStopRetrier() *StopRetrier { |
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return &StopRetrier{} |
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} |
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// Retry does not retry. |
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func (r *StopRetrier) Retry(ctx context.Context, retry int, req *http.Request, resp *http.Response, err error) (time.Duration, bool, error) { |
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return 0, false, nil |
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} |
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// -- BackoffRetrier -- |
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// BackoffRetrier is an implementation that does nothing but return nil on Retry. |
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type BackoffRetrier struct { |
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backoff Backoff |
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} |
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// NewBackoffRetrier returns a retrier that uses the given backoff strategy. |
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func NewBackoffRetrier(backoff Backoff) *BackoffRetrier { |
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return &BackoffRetrier{backoff: backoff} |
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} |
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// Retry calls into the backoff strategy and its wait interval. |
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func (r *BackoffRetrier) Retry(ctx context.Context, retry int, req *http.Request, resp *http.Response, err error) (time.Duration, bool, error) { |
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wait, goahead := r.backoff.Next(retry) |
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return wait, goahead, nil |
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}
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