53 lines
1.3 KiB
Python
53 lines
1.3 KiB
Python
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# Copyright 2019 (c) Anna Schumaker.
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import os
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import pickle
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import xdg.BaseDirectory
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__resource = "emmental"
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if os.environ.get("EMMENTAL_TESTING"):
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__resource = "emmental-testing"
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READ = 'rb'
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WRITE = 'wb'
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emmental_data = xdg.BaseDirectory.save_data_path(__resource)
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class DataFile:
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def __init__(self, path, mode):
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self.path = os.path.join(emmental_data, path)
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self.temp = os.path.join(emmental_data, f".{path}.tmp")
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self.mode = mode
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self.file = None
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def __enter__(self):
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if self.mode == WRITE:
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self.file = open(self.temp, self.mode)
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elif self.mode == READ and self.exists():
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self.file = open(self.path, self.mode)
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return self
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def __exit__(self, exp_type, exp_value, traceback):
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if self.file:
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self.file.close()
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self.file = None
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if self.mode == WRITE:
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os.rename(self.temp, self.path)
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return True
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def exists(self):
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return os.path.exists(self.path)
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def pickle(self, obj):
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if self.file:
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pickle.dump(obj, self.file, pickle.HIGHEST_PROTOCOL)
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def remove(self):
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if not self.file and self.exists():
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os.remove(self.path)
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return True
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return False
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def unpickle(self):
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if self.file:
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return pickle.load(self.file)
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