forked from cloudfoundry/fileserver
/
upload_droplet.go
158 lines (136 loc) · 3.26 KB
/
upload_droplet.go
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package upload_droplet
import (
"encoding/json"
"fmt"
"github.com/cloudfoundry/gunk/urljoiner"
"io"
"mime/multipart"
"net/http"
"time"
)
const (
JOB_QUEUED = "queued"
JOB_RUNNING = "running"
JOB_FAILED = "failed"
JOB_FINISHED = "finished"
)
func New(addr, username, password string, pollingInterval time.Duration) http.Handler {
return &dropletUploader{
addr: addr,
username: username,
password: password,
pollingInterval: pollingInterval,
}
}
type dropletUploader struct {
addr string
username string
password string
pollingInterval time.Duration
}
func (h *dropletUploader) ServeHTTP(w http.ResponseWriter, r *http.Request) {
defer r.Body.Close()
var closeChan <-chan bool
closeNotifier, ok := w.(http.CloseNotifier)
if ok {
closeChan = closeNotifier.CloseNotify()
}
pipeReader, pipeWriter := io.Pipe()
uploadReq, err := http.NewRequest("POST", h.uploadURL(r), pipeReader)
if err != nil {
handleError(w, r, err)
return
}
uploadReq.SetBasicAuth(h.username, h.password)
done := make(chan error, 1)
writer := multipart.NewWriter(pipeWriter)
uploadReq.Header.Set("Content-Type", writer.FormDataContentType())
go func() {
defer pipeWriter.Close()
fileWriter, err := writer.CreateFormFile("upload[droplet]", "droplet.tgz")
if err != nil {
done <- err
return
}
_, err = io.Copy(fileWriter, r.Body)
if err != nil {
done <- err
return
}
done <- writer.Close()
}()
uploadResp, err := http.DefaultClient.Do(uploadReq)
if err != nil {
handleError(w, r, err)
return
}
if uploadResp.StatusCode > 203 {
handleError(w, r, fmt.Errorf("Got status: %d", uploadResp.StatusCode))
return
}
err = <-done
if err != nil {
handleError(w, r, err)
return
}
err = h.poll(uploadResp, closeChan)
if err != nil {
handleError(w, r, err)
return
}
w.WriteHeader(http.StatusCreated)
}
func (h *dropletUploader) uploadURL(r *http.Request) string {
appGuid := r.FormValue(":guid")
return urljoiner.Join(h.addr, "staging", "droplets", appGuid, "upload?async=true")
}
func (h *dropletUploader) poll(res *http.Response, closeChan <-chan bool) error {
ticker := time.NewTicker(h.pollingInterval)
defer ticker.Stop()
body, err := parsePollingRequest(res)
if err != nil {
return err
}
for {
select {
case <-ticker.C:
switch body.Entity.Status {
case JOB_QUEUED, JOB_RUNNING:
res, err := http.Get(urljoiner.Join(h.addr, body.Metadata.Url))
if err != nil {
return err
}
body, err = parsePollingRequest(res)
if err != nil {
return err
}
case JOB_FINISHED:
return nil
case JOB_FAILED:
return fmt.Errorf("upload job failed")
default:
return fmt.Errorf("unknown job status: %s", body.Entity.Status)
}
case <-closeChan:
return fmt.Errorf("upstream request was cancelled")
}
}
}
type pollingResponseBody struct {
Metadata struct {
Url string
}
Entity struct {
Status string
}
}
func parsePollingRequest(res *http.Response) (pollingResponseBody, error) {
body := pollingResponseBody{}
err := json.NewDecoder(res.Body).Decode(&body)
res.Body.Close()
return body, err
}
func handleError(w http.ResponseWriter, r *http.Request, err error) {
w.WriteHeader(http.StatusInternalServerError)
w.Write([]byte(err.Error()))
}