[cache, extractor/youtube] Invalidate old cache

1 files changed, 14 insertions, 5 deletions

diff --git a/yt_dlp/cache.py b/yt_dlp/cache.py
index 83351b797..602cb9edb 100644
--- a/yt_dlp/cache.py
+++ b/yt_dlp/cache.py
@@ -6,7 +6,8 @@ import re
 import shutil
 import traceback
 
-from .utils import expand_path, write_json_file
+from .utils import expand_path, traverse_obj, version_tuple, write_json_file
+from .version import __version__
 
 
 class Cache:
@@ -45,12 +46,20 @@ class Cache:
                 if ose.errno != errno.EEXIST:
                     raise
             self._ydl.write_debug(f'Saving {section}.{key} to cache')
-            write_json_file(data, fn)
+            write_json_file({'yt-dlp_version': __version__, 'data': data}, fn)
         except Exception:
             tb = traceback.format_exc()
             self._ydl.report_warning(f'Writing cache to {fn!r} failed: {tb}')
 
-    def load(self, section, key, dtype='json', default=None):
+    def _validate(self, data, after):
+        version = traverse_obj(data, 'yt-dlp_version')
+        if not version:  # Backward compatibility
+            data, version = {'data': data}, '2022.08.19'
+        if not after or version_tuple(version) > version_tuple(after):
+            return data['data']
+        self._ydl.write_debug(f'Discarding old cache from version {version} (need {after})')
+
+    def load(self, section, key, dtype='json', default=None, *, after=None):
         assert dtype in ('json',)
 
         if not self.enabled:
@@ -61,8 +70,8 @@ class Cache:
             try:
                 with open(cache_fn, encoding='utf-8') as cachef:
                     self._ydl.write_debug(f'Loading {section}.{key} from cache')
-                    return json.load(cachef)
-            except ValueError:
+                    return self._validate(json.load(cachef), after)
+            except (ValueError, KeyError):
                 try:
                     file_size = os.path.getsize(cache_fn)
                 except OSError as oe: