From 89daa9efd1ce206931fa58b2a7374fc791ada67b Mon Sep 17 00:00:00 2001
From: OleFrost <82263101+olefrost@users.noreply.github.com>
Date: Sat, 24 Apr 2021 11:44:13 +0200
Subject: [PATCH] onedrive: Work around for random "Unable to initialize RPS"
 errors

OneDrive randomly returns the error message: "InvalidAuthenticationToken: Unable to initialize RPS". These unexpected errors typically caused the entire rclone command to fail.

This work around recognizes these errors and marks them for a low level retry, that mostly succeeds. This will make rclone commands complete without being noticeable affected.

Fixes: #5270
---
 backend/onedrive/onedrive.go | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/backend/onedrive/onedrive.go b/backend/onedrive/onedrive.go
index 7ea8caf34..6bb634024 100755
--- a/backend/onedrive/onedrive.go
+++ b/backend/onedrive/onedrive.go
@@ -566,6 +566,9 @@ func shouldRetry(ctx context.Context, resp *http.Response, err error) (bool, err
 			if len(resp.Header["Www-Authenticate"]) == 1 && strings.Index(resp.Header["Www-Authenticate"][0], "expired_token") >= 0 {
 				retry = true
 				fs.Debugf(nil, "Should retry: %v", err)
+			} else if err != nil && strings.Contains(err.Error(), "Unable to initialize RPS") {
+				retry = true
+				fs.Debugf(nil, "HTTP 401: Unable to initialize RPS. Trying again.")
 			}
 		case 429: // Too Many Requests.
 			// see https://docs.microsoft.com/en-us/sharepoint/dev/general-development/how-to-avoid-getting-throttled-or-blocked-in-sharepoint-online