message: haha rustfmt go brrr
diff: use super::Blob;
  use failure::Error;
  use futures::Future;
  +use log::{error, warn};
  use rusoto_core::region::Region;
  use rusoto_credential::DefaultCredentialsProvider;
  use rusoto_s3::{GetObjectRequest, PutObjectRequest, S3Client, S3};
  use std::convert::TryInto;
  use std::io::Read;
  use time::Timespec;
  -use log::{error, warn};
  pub(crate) struct S3Backend<'a> {
  client: S3Client,
  