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