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https://github.com/Steffo99/unimore-bda-6.git
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81 lines
2.1 KiB
Python
81 lines
2.1 KiB
Python
import typing as t
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import logging
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import shutil
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import pathlib
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import pickle
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from .datatypes import Review
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log = logging.getLogger(__name__)
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CachedDatasetFunc = t.Callable[[], t.Generator[Review, t.Any, None]]
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def store_cache(reviews: t.Iterator[Review], path: str | pathlib.Path) -> None:
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"""
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Store the contents of the given `Review` iterator to different files in a directory at the given path.
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"""
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path = pathlib.Path(path)
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if path.exists():
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raise FileExistsError("Specified cache path already exists.")
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# Create the temporary directory
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log.debug("Creating cache directory: %s", path)
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path.mkdir(parents=True)
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# Write the documents to path/{index}.pickle
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for index, document in enumerate(reviews):
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document_path = path.joinpath(f"{index}.pickle")
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log.debug("Storing pickle file: %s", document_path)
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with open(document_path, "wb") as file:
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pickle.dump(document, file)
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def load_cache(path: str | pathlib.Path) -> CachedDatasetFunc:
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"""
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Load the contents of a directory into a `Review` iterator.
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"""
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path = pathlib.Path(path)
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if not path.exists():
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raise FileNotFoundError("The specified path does not exist.")
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def data_cache_loader():
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document_paths = path.iterdir()
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for document_path in document_paths:
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document_path = pathlib.Path(document_path)
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if not str(document_path).endswith(".pickle"):
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log.debug("Ignoring non-pickle file: %s", document_path)
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continue
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log.debug("Loading pickle file: %s", document_path)
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with open(document_path, "rb") as file:
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result: Review = pickle.load(file)
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yield result
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return data_cache_loader
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def delete_cache(path: str | pathlib.Path) -> None:
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"""
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Delete the given cache directory.
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"""
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path = pathlib.Path(path)
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if not path.exists():
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raise FileNotFoundError("The specified path does not exist.")
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log.debug("Deleting cache directory: %s", path)
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shutil.rmtree(path)
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__all__ = (
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"CachedDatasetFunc",
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"store_cache",
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"load_cache",
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"delete_cache",
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)
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