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retry_round_tripper.go
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/
retry_round_tripper.go
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// Copyright © 2019 by PACE Telematics GmbH. All rights reserved.
// Created at 2019/03/15 by Florian Hübsch
package transport
import (
"errors"
"net/http"
"time"
"github.com/streadway/handy/retry"
)
// RetryRoundTripper implements a chainable round tripper for retrying requests
type RetryRoundTripper struct {
retryTransport *retry.Transport
transport http.RoundTripper
}
// RetryCodes retries when the status code is one of the provided list
func RetryCodes(codes ...int) retry.Retryer {
return func(a retry.Attempt) (retry.Decision, error) {
if a.Response == nil {
return retry.Ignore, nil
}
for _, code := range codes {
if a.Response.StatusCode == code {
return retry.Retry, nil
}
}
return retry.Ignore, nil
}
}
// Context aborts if the request's context is finished
func Context() retry.Retryer {
return func(a retry.Attempt) (retry.Decision, error) {
ctx := a.Request.Context()
select {
case <-ctx.Done():
return retry.Abort, ctx.Err()
default:
return retry.Ignore, nil
}
}
}
// NewDefaultRetryTransport returns a new default retry transport.
func NewDefaultRetryTransport() *retry.Transport {
return &retry.Transport{
Delay: retry.Constant(100 * time.Millisecond),
Retry: retry.All(Context(), retry.Max(9), retry.EOF(), retry.Net(), retry.Temporary(), RetryCodes(408, 502, 503, 504)),
}
}
// NewRetryRoundTripper returns a retry round tripper with the specified retry transport.
func NewRetryRoundTripper(rt *retry.Transport) *RetryRoundTripper {
return &RetryRoundTripper{retryTransport: rt}
}
// NewDefaultRetryRoundTripper returns a retry round tripper with a
// NewDefaultRetryTransport() as transport.
func NewDefaultRetryRoundTripper() *RetryRoundTripper {
return &RetryRoundTripper{retryTransport: NewDefaultRetryTransport()}
}
// Transport returns the RoundTripper to make HTTP requests
func (l *RetryRoundTripper) Transport() http.RoundTripper {
return l.transport
}
// SetTransport sets the RoundTripper to make HTTP requests
func (l *RetryRoundTripper) SetTransport(rt http.RoundTripper) {
l.transport = rt
}
// RoundTrip executes a HTTP request with retrying
func (l *RetryRoundTripper) RoundTrip(req *http.Request) (*http.Response, error) {
retryTransport := *l.retryTransport
retryTransport.Next = transportWithAttempt(l.Transport())
resp, err := retryTransport.RoundTrip(req)
var maxRetriesError retry.MaxError
if err != nil {
switch {
case errors.As(err, &maxRetriesError):
return nil, ErrRetryFailed
default:
return nil, err
}
}
return resp, nil
}