Synchronise token refreshing.

When running flask with multiple threads/workers, as happens when
using gunicorn, there is a potential for more than one thread running
with an expired token, leading to multiple uncoordinated token
refreshes.

This commit coordinates the threads in the case there is need to
refresh a token, ensuring only one thread does the token refresh.

1 files changed, 13 insertions, 0 deletions

diff --git a/uploader/session.py b/uploader/session.py
index 019d959..399f28c 100644
--- a/uploader/session.py
+++ b/uploader/session.py
@@ -103,3 +103,16 @@ def set_auth_server_jwks(keyset: KeySet) -> KeySet:
         }
     })
     return keyset
+
+
+def toggle_token_refreshing():
+    """Toggle the state of the token_refreshing variable."""
+    _session = session_info()
+    return save_session_info({
+        **_session,
+        "token_refreshing": not _session.get("token_refreshing", False)})
+
+
+def is_token_refreshing():
+    """Returns whether the token is being refreshed or not."""
+    return session_info().get("token_refreshing", False)