From 8749dc0434917102c52833a54c02dcae8d15eec7 Mon Sep 17 00:00:00 2001
From: Nathan Denny <ndenny@purdue.edu>
Date: Tue, 10 Jun 2025 03:38:46 -0400
Subject: [PATCH] Added "freeze" function to create immutable copies of mutable
 objects.

---
 lib/Bastion/Common.py | 30 ++++++++++++++++++++++++++++++
 1 file changed, 30 insertions(+)

diff --git a/lib/Bastion/Common.py b/lib/Bastion/Common.py
index ffef0b0..b493ce9 100644
--- a/lib/Bastion/Common.py
+++ b/lib/Bastion/Common.py
@@ -12,6 +12,13 @@
 import pathlib
 import logging
 import urllib
+from functools import singledispatch
+from types import MappingProxyType
+
+try:
+	from frozendict import frozendict
+except ImportError:
+	frozendict = lambda d: MappingProxyType(d)
 
 from typing import Any, FrozenSet
 
@@ -487,3 +494,26 @@ def asInteger(x):
 
 def asNumeric(x):
 	return float(x)
+
+@singledispatch
+def freeze(obj):
+	"""
+	An outer function that takes a generic object and attempts to build an immutable version of the given object.
+	"""
+	return obj  # default: assume immutable
+
+@freeze.register
+def _(obj: dict):
+	return frozendict({freeze(k): freeze(v) for k, v in obj.items()})
+
+@freeze.register
+def _(obj: list):
+	return tuple(freeze(i) for i in obj)
+
+@freeze.register
+def _(obj: set):
+	return frozenset(freeze(i) for i in obj)
+
+@freeze.register
+def _(obj: tuple):
+	return tuple(freeze(i) for i in obj)