Method Init

cpp/src/arrow/filesystem/s3fs.cc:1427–1456

        sse_customer_key_(sse_customer_key) {}

  Status Init() {
    // Issue a HEAD Object to get the content-length and ensure any
    // errors (e.g. file not found) don't wait until the first Read() call.
    if (content_length_ != kNoSize) {
      DCHECK_GE(content_length_, 0);
      return Status::OK();
    }

    S3Model::HeadObjectRequest req;
    req.SetBucket(ToAwsString(path_.bucket));
    req.SetKey(ToAwsString(path_.key));
    RETURN_NOT_OK(SetSSECustomerKey(&req, sse_customer_key_));

    ARROW_ASSIGN_OR_RAISE(auto client_lock, holder_->Lock());
    auto outcome = client_lock.Move()->HeadObject(req);
    if (!outcome.IsSuccess()) {
      if (IsNotFound(outcome.GetError())) {
        return PathNotFound(path_);
      } else {
        return ErrorToStatus(
            std::forward_as_tuple("When reading information for key '", path_.key,
                                  "' in bucket '", path_.bucket, "': "),
            "HeadObject", outcome.GetError());
      }
    }
    content_length_ = outcome.GetResult().GetContentLength();
    DCHECK_GE(content_length_, 0);
    metadata_ = GetObjectMetadata(outcome.GetResult());
    return Status::OK();
  }

  Status CheckClosed() const {
    if (closed_) {