builder: entirely prevent work duplication#378
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Dropped the `settings` parameter, as it couldn't be cached (dict isn't hashable) and wasn't used anyway. If this become an issue, I could special-case the hashing of `dict`s in `scoped_cache` This avoids rebuilds with successive method calls. The results are not meaningful anymore outside a given build's context, and `scoped_cache` ties the cached outputs to the `Builder` object so we cannot leak memory.
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I guess I'd also need to inject annotations |
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utils.scoped_cache: new decorator, modifying a class to memoize method calls using autogenerated object attributesUnlike
functools.lru_cache, this ensures the cached data cannot outlive theBuilderobject... and does not require itto be hasheable (incl. its attributes, like
build.{env.IsolatedEnv, ProjectBuilder})Not sure I like the name, so I'm definitely open to other suggestions.
builder.prepare.Bobscoped_cache, ensuring nothing is ever built more than once (from the sameBuilder)build: reuse metadata if it was already builtit shouldn't be done unconditionally, since building metadata may (in the worst case) require building the wheel
metadata_path: directly extract metadata from the wheelI am leaving this as a draft for now, as I don't think we'll see significant improvement before refactoring the public API:
currently, the builder isn't reused between sdist+wheel, zipapps, and metadata calls (in the PyPI uploader)