// processGet handles an image GET request.
func (h *imagesDownloadHandler) processGet(r *http.Request, resp http.ResponseWriter, st *state.State) error {
// Get the parameters from the query.
kind := r.URL.Query().Get(":kind")
series := r.URL.Query().Get(":series")
arch := r.URL.Query().Get(":arch")
modelUUID := r.URL.Query().Get(":modeluuid")
// Get the image details from storage.
metadata, imageReader, err := h.loadImage(st, modelUUID, kind, series, arch)
if err != nil {
return errors.Annotate(err, "error getting image from storage")
}
defer imageReader.Close()
// Stream the image to the caller.
logger.Debugf("streaming image from state blobstore: %+v", metadata)
resp.Header().Set("Content-Type", "application/x-tar-gz")
resp.Header().Set("Digest", params.EncodeChecksum(metadata.SHA256))
resp.Header().Set("Content-Length", fmt.Sprint(metadata.Size))
resp.WriteHeader(http.StatusOK)
if _, err := io.Copy(resp, imageReader); err != nil {
return errors.Annotate(err, "while streaming image")
}
return nil
}
func (h *backupHandler) sendFile(file io.Reader, checksum string, resp http.ResponseWriter) error {
// We don't set the Content-Length header, leaving it at -1.
resp.Header().Set("Content-Type", params.ContentTypeRaw)
resp.Header().Set("Digest", params.EncodeChecksum(checksum))
resp.WriteHeader(http.StatusOK)
if _, err := io.Copy(resp, file); err != nil {
return errors.Annotate(err, "while streaming archive")
}
return nil
}