speedup extra networks listing

modules/cache.py

@@ -1,12 +1,12 @@
 import json
 import os.path
-
-import filelock
+import threading
 
 from modules.paths import data_path, script_path
 
 cache_filename = os.path.join(data_path, "cache.json")
 cache_data = None
+cache_lock = threading.Lock()
 
 
 def dump_cache():
@@ -14,7 +14,7 @@ def dump_cache():
     Saves all cache data to a file.
     """
 
-    with filelock.FileLock(f"{cache_filename}.lock"):
+    with cache_lock:
         with open(cache_filename, "w", encoding="utf8") as file:
             json.dump(cache_data, file, indent=4)
 
@@ -33,17 +33,18 @@ def cache(subsection):
     global cache_data
 
     if cache_data is None:
-        with filelock.FileLock(f"{cache_filename}.lock"):
-            if not os.path.isfile(cache_filename):
-                cache_data = {}
-            else:
-                try:
-                    with open(cache_filename, "r", encoding="utf8") as file:
-                        cache_data = json.load(file)
-                except Exception:
-                    os.replace(cache_filename, os.path.join(script_path, "tmp", "cache.json"))
-                    print('[ERROR] issue occurred while trying to read cache.json, move current cache to tmp/cache.json and create new cache')
+        with cache_lock:
+            if cache_data is None:
+                if not os.path.isfile(cache_filename):
                     cache_data = {}
+                else:
+                    try:
+                        with open(cache_filename, "r", encoding="utf8") as file:
+                            cache_data = json.load(file)
+                    except Exception:
+                        os.replace(cache_filename, os.path.join(script_path, "tmp", "cache.json"))
+                        print('[ERROR] issue occurred while trying to read cache.json, move current cache to tmp/cache.json and create new cache')
+                        cache_data = {}
 
     s = cache_data.get(subsection, {})
     cache_data[subsection] = s