use custom file-system pickle based cache

cache.py

@@ -1,18 +1,28 @@
 import logging
-
-import diskcache
+import os
+import pickle
 
 import util
 
-cache = diskcache.Cache(util.get_root_fs() + '/cache')
+root_fs_cache = util.get_root_fs() + '/cache'
+
+
+def _cache_path(namespace, key):
+    cache_namespace = root_fs_cache + '/' + namespace
+    os.makedirs(cache_namespace, exist_ok=True)
+    return os.path.join(cache_namespace, f'{key}.pkl')
 
 
-def put(namespace, key: str, value):
-    cache.set(f'{namespace}:{key.strip().lower()}', value)
+def get(namespace, key):
+    try:
+        with open(_cache_path(namespace, f'{key.strip().lower()}'), 'rb') as f:
+            value = pickle.load(f)
+            logging.info(f'cache hit for {key} in namespace: {namespace}, with value: {value}')
+            return value
+    except FileNotFoundError:
+        return None
 
 
-def get(namespace, key: str):
-    result = cache.get(f'{namespace}:{key.strip().lower()}')
-    if result is not None:
-        logging.info(f'cache hit for {namespace}:{key} -> {result}')
-        return result
+def put(namespace, key, value):
+    with open(_cache_path(namespace, f'{key.strip().lower()}'), 'wb') as f:
+        pickle.dump(value, f)

requirements.txt

@@ -38,4 +38,3 @@ typing_extensions==4.11.0
 tzlocal==5.2
 urllib3==2.2.1
 yarl==1.9.4
-diskcache==5.6.3

util.py

@@ -45,4 +45,4 @@ def get_congrats_msg():
 
 
 def get_root_fs():
-    return os.getenv('VOLUME_ROOT_FS', '/tmp')
+    return os.getenv('VOLUME_ROOT_FS', '/tmp') + '/lunchy'