X-Git-Url: https://wannabe.guru.org/gitweb/?a=blobdiff_plain;f=persistent.py;h=b42a5c0e3036a35d76dc0c8f32374d029e94fd53;hb=c08841600a2f61049cdb1a152407a1fb8ca129a5;hp=119931b8ccba607ccc48321ac6f3d6dd3dd5b791;hpb=713a609bd19d491de03debf8a4a6ddf2540b13dc;p=python_utils.git

diff --git a/persistent.py b/persistent.py
index 119931b..b42a5c0 100644
--- a/persistent.py
+++ b/persistent.py
@@ -1,5 +1,11 @@
 #!/usr/bin/env python3
 
+# © Copyright 2021-2022, Scott Gasch
+
+"""A Persistent is just a class with a load and save method.  This
+module defines the Persistent base and a decorator that can be used to
+create a persistent singleton that autoloads and autosaves."""
+
 import atexit
 import datetime
 import enum
@@ -58,7 +64,23 @@ class Persistent(ABC):
 
 
 def was_file_written_today(filename: str) -> bool:
-    """Returns True if filename was written today."""
+    """Returns True if filename was written today.
+
+    >>> import os
+    >>> filename = f'/tmp/testing_persistent_py_{os.getpid()}'
+    >>> os.system(f'touch {filename}')
+    0
+    >>> was_file_written_today(filename)
+    True
+    >>> os.system(f'touch -d 1974-04-15T01:02:03.99 {filename}')
+    0
+    >>> was_file_written_today(filename)
+    False
+    >>> os.system(f'/bin/rm -f {filename}')
+    0
+    >>> was_file_written_today(filename)
+    False
+    """
 
     if not file_utils.does_file_exist(filename):
         return False
@@ -76,7 +98,22 @@ def was_file_written_within_n_seconds(
     """Returns True if filename was written within the pas limit_seconds
     seconds.
 
+    >>> import os
+    >>> filename = f'/tmp/testing_persistent_py_{os.getpid()}'
+    >>> os.system(f'touch {filename}')
+    0
+    >>> was_file_written_within_n_seconds(filename, 60)
+    True
+    >>> import time
+    >>> time.sleep(2.0)
+    >>> was_file_written_within_n_seconds(filename, 2)
+    False
+    >>> os.system(f'/bin/rm -f {filename}')
+    0
+    >>> was_file_written_within_n_seconds(filename, 60)
+    False
     """
+
     if not file_utils.does_file_exist(filename):
         return False
 
@@ -136,21 +173,21 @@ class persistent_autoloaded_singleton(object):
             # memory.
             if self.instance is not None:
                 logger.debug(
-                    f'Returning already instantiated singleton instance of {cls.__name__}.'
+                    'Returning already instantiated singleton instance of %s.', cls.__name__
                 )
                 return self.instance
 
             # Otherwise, try to load it from persisted state.
             was_loaded = False
-            logger.debug(f'Attempting to load {cls.__name__} from persisted state.')
+            logger.debug('Attempting to load %s from persisted state.', cls.__name__)
             self.instance = cls.load()
             if not self.instance:
                 msg = 'Loading from cache failed.'
                 logger.warning(msg)
-                logger.debug(f'Attempting to instantiate {cls.__name__} directly.')
+                logger.debug('Attempting to instantiate %s directly.', cls.__name__)
                 self.instance = cls(*args, **kwargs)
             else:
-                logger.debug(f'Class {cls.__name__} was loaded from persisted state successfully.')
+                logger.debug('Class %s was loaded from persisted state successfully.', cls.__name__)
                 was_loaded = True
 
             assert self.instance is not None
@@ -163,3 +200,9 @@ class persistent_autoloaded_singleton(object):
             return self.instance
 
         return _load
+
+
+if __name__ == '__main__':
+    import doctest
+
+    doctest.testmod()