forked from TrueCloudLab/restic
73 lines
1.7 KiB
Go
73 lines
1.7 KiB
Go
package autorest
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import (
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"bytes"
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"io"
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"io/ioutil"
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"net/http"
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)
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// RetriableRequest provides facilities for retrying an HTTP request.
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type RetriableRequest struct {
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req *http.Request
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rc io.ReadCloser
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br *bytes.Reader
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reset bool
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}
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// NewRetriableRequest returns a wrapper around an HTTP request that support retry logic.
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func NewRetriableRequest(req *http.Request) *RetriableRequest {
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return &RetriableRequest{req: req}
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}
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// Request returns the wrapped HTTP request.
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func (rr *RetriableRequest) Request() *http.Request {
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return rr.req
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}
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// Prepare signals that the request is about to be sent.
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func (rr *RetriableRequest) Prepare() (err error) {
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// preserve the request body; this is to support retry logic as
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// the underlying transport will always close the reqeust body
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if rr.req.Body != nil {
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if rr.reset {
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if rr.rc != nil {
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rr.req.Body = rr.rc
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} else if rr.br != nil {
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_, err = rr.br.Seek(0, io.SeekStart)
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}
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rr.reset = false
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if err != nil {
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return err
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}
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}
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if rr.req.GetBody != nil {
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// this will allow us to preserve the body without having to
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// make a copy. note we need to do this on each iteration
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rr.rc, err = rr.req.GetBody()
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if err != nil {
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return err
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}
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} else if rr.br == nil {
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// fall back to making a copy (only do this once)
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b := []byte{}
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if rr.req.ContentLength > 0 {
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b = make([]byte, rr.req.ContentLength)
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_, err = io.ReadFull(rr.req.Body, b)
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if err != nil {
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return err
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}
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} else {
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b, err = ioutil.ReadAll(rr.req.Body)
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if err != nil {
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return err
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}
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}
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rr.br = bytes.NewReader(b)
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rr.req.Body = ioutil.NopCloser(rr.br)
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}
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// indicates that the request body needs to be reset
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rr.reset = true
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}
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return err
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}
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