def _get_sample_offset(self, line_num):
"""
Returns the correct offset of line 'line_num'
referring to the file a_few_lines.log construction.
Be careful when modifying a_few_lines.log.
"""
assert line_num <= self._count_lines_in_file(
TestPaths.get_file_path(AFewLinesLogParams.FILE_NAME))
return line_num * AFewLinesLogParams.SINGLE_LINE_LENGTH
def test_getting_line_by_offset_basic(self):
with open(TestPaths.get_file_path(AFewLinesLogParams.FILE_NAME)) as fh:
read_line = ReadUtils._read_entire_line(fh, 2, 10)
assert read_line == ('aaa-0-bbb', 0, 9)
read_line = ReadUtils._read_entire_line(fh, 2, 200)
assert read_line == ('aaa-0-bbb', 0, 9)
read_line = ReadUtils._read_entire_line(fh, 42, 10)
assert read_line == ('aaa-4-bbb', 40, 49)
read_line = ReadUtils._read_entire_line(fh, 99, 10)
assert read_line == ('aaa-9-bbb', 90, 99)
def test_getting_line_by_offset_basic(self):
with open(TestPaths.get_file_path(AFewLinesLogParams.FILE_NAME)) as fh:
read_line = ReadUtils._read_entire_line(fh, 2, 10)
assert read_line == ('aaa-0-bbb', 0, 9)
read_line = ReadUtils._read_entire_line(fh, 2, 200)
assert read_line == ('aaa-0-bbb', 0, 9)
read_line = ReadUtils._read_entire_line(fh, 42, 10)
assert read_line == ('aaa-4-bbb', 40, 49)
read_line = ReadUtils._read_entire_line(fh, 99, 10)
assert read_line == ('aaa-9-bbb', 90, 99)
def test_getting_line_by_offset_huge(self):
with open(TestPaths.get_file_path(AFewLinesLogParams.FILE_NAME)) as fh:
for j in six.moves.range(1, 120, 7):
for i in six.moves.range(100):
assert ReadUtils.get_line_containing_offset(fh, i, j) == \
AFewLinesLogParams.get_line_with_borders(i)
def test_getting_line_by_offset_huge(self):
with open(TestPaths.get_file_path(AFewLinesLogParams.FILE_NAME)) as fh:
for j in six.moves.range(1, 120, 7):
for i in six.moves.range(100):
assert ReadUtils.get_line_containing_offset(fh, i, j) == \
AFewLinesLogParams.get_line_with_borders(i)
def test_yield_nothing_when_offset_is_zero(self):
log_file_path = TestPaths.get_file_path(AFewLinesLogParams.FILE_NAME)
offset = 0
self._run_reverse_and_check_results(log_file_path, [offset], 0)
def test_file_size_as_offset(self):
log_file_path = TestPaths.get_file_path(AFewLinesLogParams.FILE_NAME)
file_size_as_offset = os.path.getsize(log_file_path)
self._run_reverse_and_check_results(
log_file_path, [file_size_as_offset],
self._count_lines_in_file(log_file_path))
def _sample_call_with_specified_bufsize(self, bufsize):
log_file_path = TestPaths.get_file_path(AFewLinesLogParams.FILE_NAME)
how_many_lines = 7
offset = self._get_sample_offset(how_many_lines)
self._run_reverse_and_check_results(log_file_path, [offset, bufsize],
how_many_lines)