putio: add ability to resume uploads

backend/putio/error.go

@@ -0,0 +1,43 @@
+package putio
+
+import (
+	"fmt"
+	"net/http"
+
+	"github.com/putdotio/go-putio/putio"
+	"github.com/rclone/rclone/fs/fserrors"
+)
+
+func checkStatusCode(resp *http.Response, expected int) error {
+	if resp.StatusCode != expected {
+		return &statusCodeError{response: resp}
+	}
+	return nil
+}
+
+type statusCodeError struct {
+	response *http.Response
+}
+
+func (e *statusCodeError) Error() string {
+	return fmt.Sprintf("unexpected status code (%d) response while doing %s to %s", e.response.StatusCode, e.response.Request.Method, e.response.Request.URL.String())
+}
+
+func (e *statusCodeError) Temporary() bool {
+	return e.response.StatusCode == 429 || e.response.StatusCode >= 500
+}
+
+// shouldRetry returns a boolean as to whether this err deserves to be
+// retried.  It returns the err as a convenience
+func shouldRetry(err error) (bool, error) {
+	if err == nil {
+		return false, nil
+	}
+	if perr, ok := err.(*putio.ErrorResponse); ok {
+		err = &statusCodeError{response: perr.Response}
+	}
+	if fserrors.ShouldRetry(err) {
+		return true, err
+	}
+	return false, err
+}