nathanwilliams-ct commented on code in PR #2172:
URL: https://github.com/apache/buildstream/pull/2172#discussion_r3795555037
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src/buildstream/element.py:
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@@ -3337,6 +3337,8 @@ def __update_cache_keys(self):
# This code can be run multiple times until the strict key can be
calculated,
# so let's ensure we only ever calculate the weak key once, even
though we need
# to resolve it before we can resolve the strict key.
+ build_dependencies = list(self._dependencies(_Scope.BUILD))
Review Comment:
Just to note:
I've proposed a refactor of _calculate_cache_key over here:
https://github.com/apache/buildstream/pull/2167/changes/c3369b7577d9ea32862512c9b38c844cbad38bc5#diff-7d3ea8e226c37028881ae2f47facfe404a1c84346d4238569a63b0caacfb0ea2R2360
To avoid the complicated list comprehension that goes on here, with it's mess
of dynamic typing of list[tuple[str,str] | tuple[str,str,None] |
tuple[str,str,str]] and hard to read logic.
Although, I still end up calling _dependencies every time
_calculate_cache_key is called...
-----
Feedback:
hmm.. Instead of storing the result of _dependencies here, it might be worth
refactoring `_dependencies` to directly cache it's own results, so it can
return the cached result after the first call, whenever it's called anywhere
instead of just here.
```python
...
__dependency_set_cache: dict[str,set[Element]] = {}
def __dependencies(...) -> ...:
# Check if we already calculated this set of dependencies
dependency_set_cache_key = f"{scope}, {recurse}" # (probably need to
include the _dependencies 'visited' argument here too...)
if (dependencies :=
self.__dependency_set_cache.get(dependency_set_cache_key)) is not None:
for element in dependencies:
yield element
return
# Calculate result/visited
....
# Store result for next time
self.__build_dependencies_set[dependency_set_cache_key] = result # ( or
'visited' from the recursive visit function)
```
It will need some thinking, but maybe it would even be appropriate to use
functools `@cache` annotation? https://docs.python.org/3/library/functools.html
The recursive visit function might also benefit from the @cache annotation..
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