Capture, log and handle generic exceptions

Handle any and all unforeseen error conditions gracefully by capturing
the exceptions, logging out for debug purposes and providing the user
with a generic error page.

1 files changed, 14 insertions, 0 deletions

diff --git a/qc_app/errors.py b/qc_app/errors.py
new file mode 100644
index 0000000..0da6b3c
--- /dev/null
+++ b/qc_app/errors.py
@@ -0,0 +1,14 @@
+"""Application error handling."""
+import logging
+import traceback
+
+from flask import Flask, render_template
+
+def handle_general_exception(exc: Exception):
+    trace = traceback.format_exc()
+    logging.error("Error: Generic unhandled exception!!\n%s", trace)
+    return render_template("unhandled_exception.html", trace=trace)
+
+def register_error_handlers(app: Flask):
+    """Register top-level error/exception handlers."""
+    app.register_error_handler(Exception, handle_general_exception)