Coverage for src / invariant / store / null.py: 100.00%

1"""NullStore: No-op artifact store. Every operation executes; nothing is cached.""" 

2 

3from typing import Any 

4 

5from invariant.store.base import ArtifactStore 

6 

7 

8class NullStore(ArtifactStore): 

9 """Store that never caches. exists() always returns False; put() is a no-op. 

10 

11 Use for execution correctness tests where cache behavior is irrelevant. 

12 Stats are not updated (remains no-op). 

13 """ 

14 

15 def exists(self, op_name: str, digest: str) -> bool: 

16 """Always return False; nothing is ever cached.""" 

17 return False 

18 

19 def get(self, op_name: str, digest: str) -> Any: 

20 """Raise KeyError. Should never be called since exists() always returns False.""" 

21 raise KeyError( 

22 f"Artifact with op_name '{op_name}' and digest '{digest}' not found" 

23 ) 

24 

25 def put(self, op_name: str, digest: str, artifact: Any) -> None: 

26 """No-op; nothing is stored.""" 

27 pass