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# Author: Simon Blanke |
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# Email: [email protected] |
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# License: MIT License |
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import os |
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import contextlib |
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import pandas as pd |
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from filelock import FileLock |
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@contextlib.contextmanager |
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def atomic_overwrite(filename): |
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# from: https://stackoverflow.com/questions/42409707/pandas-to-csv-overwriting-prevent-data-loss |
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temp = filename + "~" |
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with open(temp, "w") as f: |
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yield f |
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os.rename(temp, filename) # this will only happen if no exception was raised |
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class DataIO: |
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def __init__(self, path, drop_duplicates): |
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self.path = path |
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self.replace_existing = False |
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self.drop_duplicates = drop_duplicates |
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if self.replace_existing: |
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self.mode = "w" |
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else: |
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self.mode = "a" |
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def _save_dataframe(self, dataframe, io_wrap): |
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if self.drop_duplicates: |
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dataframe.drop_duplicates(subset=self.drop_duplicates, inplace=True) |
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dataframe.to_csv(io_wrap, index=False, header=not io_wrap.tell()) |
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def atomic_write(self, dataframe, path, replace_existing): |
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self.replace_existing = replace_existing |
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with atomic_overwrite(path) as io_wrap: |
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self._save_dataframe(dataframe, io_wrap) |
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def locked_write(self, dataframe, path): |
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lock = FileLock(path + ".lock~") |
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with lock: |
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with open(path, self.mode) as io_wrap: |
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self._save_dataframe(dataframe, io_wrap) |
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""" |
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import fcntl |
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with open(path, self.mode) as io_wrap: |
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fcntl.flock(io_wrap, fcntl.LOCK_EX) |
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self._save_dataframe(dataframe, io_wrap) |
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fcntl.flock(io_wrap, fcntl.LOCK_UN) |
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""" |
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def load(self, path): |
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if os.path.isfile(self.path) and os.path.getsize(self.path) > 0: |
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return pd.read_csv(self.path) |
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class DataCollector: |
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def __init__(self, path, drop_duplicates=False): |
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self.path = path |
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self.drop_duplicates = drop_duplicates |
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self.path2file = path.rsplit("/", 1)[0] + "/" |
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self.file_name = path.rsplit("/", 1)[1] |
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self.io = DataIO(path, drop_duplicates) |
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def load(self): |
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return self.io.load(self.path) |
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def append(self, dictionary): |
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dataframe = pd.DataFrame(dictionary, index=[0]) |
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self.io.locked_write(dataframe, self.path) |
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def save(self, dataframe, replace_existing=False): |
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self.io.atomic_write(dataframe, self.path, replace_existing) |
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SimonBlanke /
Hyperactive
