/
uploader.go
103 lines (84 loc) · 2.43 KB
/
uploader.go
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package ccclient
import (
"fmt"
"io/ioutil"
"net"
"net/http"
"net/url"
"code.cloudfoundry.org/lager/v3"
)
const MAX_UPLOAD_RETRIES = 3
type uploader struct {
logger lager.Logger
client *http.Client
tlsClient *http.Client
}
func NewUploader(logger lager.Logger, httpClient *http.Client) Uploader {
return &uploader{
client: httpClient,
logger: logger.Session("uploader"),
}
}
const contentMD5Header = "Content-MD5"
const contentDigestHeader = "Content-Digest"
func (u *uploader) Upload(uploadURL *url.URL, filename string, r *http.Request, cancelChan <-chan struct{}) (*http.Response, error) {
if r.ContentLength <= 0 {
return &http.Response{StatusCode: http.StatusLengthRequired}, fmt.Errorf("Missing Content Length")
}
defer r.Body.Close()
uploadReq, err := newMultipartRequestFromReader(r.ContentLength, r.Body, filename)
if err != nil {
return nil, err
}
uploadReq.Header.Set(contentMD5Header, r.Header.Get(contentMD5Header))
uploadReq.Header.Set(contentDigestHeader, r.Header.Get(contentDigestHeader))
uploadReq.URL = uploadURL
var rsp *http.Response
var uploadErr error
for attempt := 0; attempt < MAX_UPLOAD_RETRIES; attempt++ {
logger := u.logger.WithData(lager.Data{"attempt-number": attempt})
logger.Info("uploading")
rsp, uploadErr = u.do(uploadReq, cancelChan)
if uploadErr == nil {
logger.Info("succeeded-uploading")
break
}
logger.Error("failed-uploading", err)
// not a connect (dial) error
var nestedErr error = uploadErr
if urlErr, ok := nestedErr.(*url.Error); ok {
nestedErr = urlErr.Err
}
if netErr, ok := nestedErr.(*net.OpError); !ok || netErr.Op != "dial" {
break
}
}
return rsp, uploadErr
}
func (u *uploader) do(req *http.Request, cancelChan <-chan struct{}) (*http.Response, error) {
completion := make(chan struct{})
defer close(completion)
go func() {
select {
case <-cancelChan:
if canceller, ok := u.client.Transport.(requestCanceller); ok {
canceller.CancelRequest(req)
} else {
u.logger.Error("Invalid transport, does not support CancelRequest", nil, lager.Data{"transport": u.client.Transport})
}
case <-completion:
}
}()
rsp, err := u.client.Do(req)
req.Body.Close()
if err != nil {
return nil, err
}
switch rsp.StatusCode {
case http.StatusOK, http.StatusCreated:
return rsp, nil
}
respBody, _ := ioutil.ReadAll(rsp.Body)
rsp.Body.Close()
return rsp, fmt.Errorf("status code: %d\n%s", rsp.StatusCode, string(respBody))
}