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from io import BufferedReader, BytesIO, SEEK_CUR
from pathlib import Path
import os
import pygrib
import pytest
filename = os.path.join(
os.path.dirname(os.path.abspath(__file__)), "../sampledata/flux.grb"
)
message_lines_expected_for_data_with_zero_offset = """
1:Precipitation rate:kg m**-2 s**-1 (avg):regular_gg:surface:level 0:fcst time 108-120 hrs (avg):from 200402291200
2:Surface pressure:Pa (instant):regular_gg:surface:level 0:fcst time 120 hrs:from 200402291200
3:Maximum temperature:K (instant):regular_gg:heightAboveGround:level 2 m:fcst time 108-120 hrs:from 200402291200
4:Minimum temperature:K (instant):regular_gg:heightAboveGround:level 2 m:fcst time 108-120 hrs:from 200402291200
""".lstrip()
message_lines_expected_for_data_with_4bytes_offset = """
1:Surface pressure:Pa (instant):regular_gg:surface:level 0:fcst time 120 hrs:from 200402291200
2:Maximum temperature:K (instant):regular_gg:heightAboveGround:level 2 m:fcst time 108-120 hrs:from 200402291200
3:Minimum temperature:K (instant):regular_gg:heightAboveGround:level 2 m:fcst time 108-120 hrs:from 200402291200
""".lstrip()
def assert_message_lines(grbs, capsys, expected):
for grb in grbs:
print(grb)
captured = capsys.readouterr()
assert captured.out == expected
def test_open_for_filename(capsys):
grbs = pygrib.open(filename)
assert type(grbs.name) == str
assert_message_lines(grbs, capsys, message_lines_expected_for_data_with_zero_offset)
assert_message_lines(grbs, capsys, "")
grbs.seek(0)
assert_message_lines(grbs, capsys, message_lines_expected_for_data_with_zero_offset)
grbs.close()
def test_open_for_path_object(capsys):
path = Path(filename)
grbs = pygrib.open(path)
assert type(grbs.name) == str
assert_message_lines(grbs, capsys, message_lines_expected_for_data_with_zero_offset)
assert_message_lines(grbs, capsys, "")
grbs.seek(0)
assert_message_lines(grbs, capsys, message_lines_expected_for_data_with_zero_offset)
grbs.close()
def test_open_for_bufferedreader_object(capsys):
# BufferedReader with underlying file.
f = open(filename, "rb")
grbs = pygrib.open(f)
assert type(grbs.name) == str
assert_message_lines(grbs, capsys, message_lines_expected_for_data_with_zero_offset)
assert_message_lines(grbs, capsys, "")
grbs.seek(0)
assert_message_lines(grbs, capsys, message_lines_expected_for_data_with_zero_offset)
grbs.close()
f.close()
# BufferedReader with no fileno (just a byte stream)
if pygrib.__has_fmemopen__: # not implemented on Windows
f = open(filename, "rb")
fb = BufferedReader(BytesIO(f.read()))
grbs = pygrib.open(fb)
assert grbs.name == None
assert_message_lines(grbs, capsys, message_lines_expected_for_data_with_zero_offset)
assert_message_lines(grbs, capsys, "")
grbs.seek(0)
assert_message_lines(grbs, capsys, message_lines_expected_for_data_with_zero_offset)
grbs.close()
f.close(); fb.close()
@pytest.mark.xfail(reason="unimplemented")
def test_open_for_bytesio_object(capsys):
with open(filename, "rb") as f:
buffer = f.read()
f = BytesIO(buffer)
grbs = pygrib.open(f)
assert type(grbs.name) == str
assert_message_lines(grbs, capsys, message_lines_expected_for_data_with_zero_offset)
assert_message_lines(grbs, capsys, "")
grbs.seek(0)
assert_message_lines(grbs, capsys, message_lines_expected_for_data_with_zero_offset)
grbs.close()
f.close()
def test_open_for_textiowrapper_object():
f = open(filename, "r")
with pytest.raises(TypeError) as e:
pygrib.open(f)
assert str(e.value) == "expected bytes, _io.TextIOWrapper found"
INDICATOR = b"GRIB"
def read_indicator(f):
assert f.read(len(INDICATOR)) == INDICATOR
def read_indicator_and_seek_to_starting_point(f):
read_indicator(f)
f.seek(-len(INDICATOR), SEEK_CUR)
def reread_end_section_using_raw_file_access(f):
end_section_bytes = b"7777"
f.seek(-len(end_section_bytes), SEEK_CUR)
assert f.read(len(end_section_bytes)) == end_section_bytes
@pytest.mark.parametrize(
"preprocess, message_lines_expected, postprocess",
[
(read_indicator, message_lines_expected_for_data_with_4bytes_offset, None,),
(
read_indicator_and_seek_to_starting_point,
message_lines_expected_for_data_with_zero_offset,
None,
),
(
None,
message_lines_expected_for_data_with_zero_offset,
reread_end_section_using_raw_file_access,
),
(
read_indicator_and_seek_to_starting_point,
message_lines_expected_for_data_with_zero_offset,
reread_end_section_using_raw_file_access,
),
],
)
def test_open_for_bufferedreader_object_with_raw_file_reading(
capsys, preprocess, message_lines_expected, postprocess
):
f = open(filename, "rb")
if preprocess is not None:
preprocess(f)
grbs = pygrib.open(f)
assert_message_lines(grbs, capsys, message_lines_expected)
grbs.seek(0)
assert_message_lines(grbs, capsys, message_lines_expected)
grbs.close()
if postprocess is not None:
postprocess(f)
f.close()
@pytest.mark.parametrize(
"preprocess, message_lines_expected, postprocess",
[
(read_indicator, message_lines_expected_for_data_with_4bytes_offset, None,),
(
read_indicator_and_seek_to_starting_point,
message_lines_expected_for_data_with_zero_offset,
None,
),
(
None,
message_lines_expected_for_data_with_zero_offset,
reread_end_section_using_raw_file_access,
),
(
read_indicator_and_seek_to_starting_point,
message_lines_expected_for_data_with_zero_offset,
reread_end_section_using_raw_file_access,
),
],
)
@pytest.mark.xfail(reason="unimplemented")
def test_open_for_bytesio_object_with_raw_file_reading(
capsys, preprocess, message_lines_expected, postprocess
):
with open(filename, "rb") as f:
buffer = f.read()
f = BytesIO(buffer)
if preprocess is not None:
preprocess(f)
grbs = pygrib.open(f)
assert_message_lines(grbs, capsys, message_lines_expected)
grbs.seek(0)
assert_message_lines(grbs, capsys, message_lines_expected)
grbs.close()
if postprocess is not None:
postprocess(f)
f.close()
|
