def test_empty_read(self):
"""Tests read behavior when none filename is supplied."""
tmpfile = self.write_to_tmpfile([])
test_slice = LevelSlice(tmpfile.name)
assert test_slice._records == {}
test_slice.read()
assert test_slice._records == {}
def test_read(self, test_records1):
"""Tests if read records same as saved ones."""
tmpfile = self.write_to_tmpfile(test_records1)
test_slice = LevelSlice(tmpfile.name)
test_slice.read()
assert test_slice._records['PPX_ASYS'] == test_records1
tmpfile.close()
def test_get_start(self, test_records1):
"""Tests start time is earliest in all records."""
tmpfile = self.write_to_tmpfile(test_records1)
test_slice = LevelSlice(tmpfile.name)
assert test_slice._start == -1
test_slice.read()
assert test_slice.get_first_timestamp() == test_records1[0][0]
tmpfile.close()
def test_downsample_factor(self, test_records1, strategy, factor):
"""Tests if right downsample strategy is applied, using downsample factor."""
tmpfile = self.write_to_tmpfile(test_records1)
test_slice = LevelSlice(tmpfile.name)
test_slice.read()
downsampled = test_slice.downsample(strategy, factor)
assert downsampled['PPX_ASYS'] == strategy_reducer(
test_records1, strategy, factor)
tmpfile.close()
def test_save_parameter(self, test_records1):
"""Tests if parameter records saved."""
tmpfile = NamedTemporaryFile()
test_save_slice = LevelSlice(tmpfile.name)
formatted_test_records = {test_records1[0][2]: test_records1}
test_save_slice.save(test_records1)
test_read_slice = LevelSlice(tmpfile.name)
test_read_slice.read()
assert test_read_slice._records == formatted_test_records
tmpfile.close()
def test_downsample_max_records(self, test_records1, strategy,
max_records):
"""Tests if right downsample strategy is applied, using max records."""
tmpfile = self.write_to_tmpfile(test_records1)
test_slice = LevelSlice(tmpfile.name)
test_slice.read()
downsampled = test_slice.downsample(strategy, max_records=max_records)
downsample_factor = ceil(len(test_records1) / max_records)
assert downsampled['PPX_ASYS'] == strategy_reducer(
test_records1, strategy, downsample_factor)
tmpfile.close()
def _single_level_downsample(self, strategy, prev_level, curr_level,
level_metadata):
"""Downsamples for one single level.
Args:
strategy: A string representing a downsampling strategy.
prev_level: A string of the name of the current level.
curr_level: A string of the name of the previous level.
level_metadata: A metadata object for this level.
Returns:
A dict of metadata for the current level.
"""
curr_slice_names = self._metadata['levels'][curr_level]['names']
prev_slice_names = self._metadata['levels'][prev_level]['names']
slice_index = 0
curr_slice_path = utils.get_slice_path(
self._preprocess_dir, curr_level,
utils.get_slice_name(slice_index), strategy)
curr_level_slice = LevelSlice(curr_slice_path,
bucket=self._preprocess_bucket)
for prev_slice_name in prev_slice_names:
prev_slice_path = utils.get_slice_path(self._preprocess_dir,
prev_level, prev_slice_name,
strategy)
prev_level_slice = LevelSlice(prev_slice_path,
bucket=self._preprocess_bucket)
prev_level_slice.read()
prev_level_downsample = prev_level_slice.downsample(
strategy, self._downsample_level_factor)
curr_level_slice.add_records(prev_level_downsample)
if curr_level_slice.get_records_count() >= self._number_per_slice:
curr_level_slice.save()
level_metadata[curr_slice_names[
slice_index]] = curr_level_slice.get_first_timestamp()
slice_index += 1
curr_slice_path = utils.get_slice_path(
self._preprocess_dir, curr_level,
utils.get_slice_name(slice_index), strategy)
curr_level_slice = LevelSlice(curr_slice_path,
bucket=self._preprocess_bucket)
curr_level_slice.save()
level_metadata[curr_slice_names[
slice_index]] = curr_level_slice.get_first_timestamp()
return level_metadata