Cleanup

generator/role_cache.py

@@ -0,0 +1,29 @@
+"""Role cache persistence; cache identity never supplies musical randomness."""
+import json
+
+import generator.cache
+import generator.fretboard
+import generator.validation
+
+ENTRYPOINTS = ('generator.composition',)
+
+def code_key():
+  return generator.cache.fingerprint(generator.cache.source_identity(ENTRYPOINTS))
+
+def restore(path, key):
+  if path is None or not path.is_file() or path.is_symlink():
+    return None
+  try:
+    entry = json.loads(path.read_text())
+    value = entry['result']
+    if entry['key'] == key and entry['digest'] == generator.cache.fingerprint(value):
+      generator.validation.validate_document(value['document'])
+      generator.fretboard.validate_document(value['document'])
+      return {**value, 'cache_hit': True}
+  except (OSError, ValueError, KeyError, TypeError):
+    pass
+  return None
+
+def store(path, key, value):
+  if path is not None:
+    generator.cache.write_json(path, {'key': key, 'digest': generator.cache.fingerprint(value), 'result': value})