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import collections
import itertools
import pathlib
import numpy as np
import pytest
import eccodes
SAMPLE_DATA_FOLDER = pathlib.Path(__file__).parent / "sample-data"
TEST_GRIB_DATA = SAMPLE_DATA_FOLDER / "tiggelam_cnmc_sfc.grib2"
TEST_GRIB_DATA2 = SAMPLE_DATA_FOLDER / "era5-levels-members.grib"
def test_filereader():
with eccodes.FileReader(TEST_GRIB_DATA) as reader:
count = len([None for _ in reader])
assert count == 7
def test_read_message():
with eccodes.FileReader(TEST_GRIB_DATA) as reader:
message = next(reader)
assert isinstance(message, eccodes.GRIBMessage)
def test_message_get():
dummy_default = object()
known_missing = "scaleFactorOfSecondFixedSurface"
with eccodes.FileReader(TEST_GRIB_DATA) as reader:
message = next(reader)
assert message.get("edition") == 2
assert message.get("nonexistent") is None
assert message.get("nonexistent", dummy_default) is dummy_default
assert message.get("centre", ktype=int) == 250
assert message.get("dataType:int") == 11
num_vals = message.get("numberOfValues")
assert message.get_size("values") == num_vals
vals = message.get("values")
assert len(vals) == num_vals
vals2 = message.data
assert np.all(vals == vals2)
assert message["Ni"] == 511
assert message["gridType:int"] == 0
with pytest.raises(KeyError):
message["invalid"]
# keys set as MISSING
assert message.is_missing(known_missing)
assert message.get(known_missing) is None
assert message.get(known_missing, dummy_default) is dummy_default
with pytest.raises(KeyError):
message[known_missing]
def test_message_set_plain():
missing_key = "scaleFactorOfFirstFixedSurface"
with eccodes.FileReader(TEST_GRIB_DATA) as reader:
message = next(reader)
message.set("centre", "ecmf")
vals = np.arange(message.get("numberOfValues"), dtype=np.float32)
message.set_array("values", vals)
message.set_missing(missing_key)
assert message.get("centre") == "ecmf"
assert np.all(message.get("values") == vals)
assert message.is_missing(missing_key)
def test_message_set_dict_with_checks():
with eccodes.FileReader(TEST_GRIB_DATA) as reader:
message = next(reader)
message.set(
{
"centre": "ecmf",
"numberOfValues": 10,
"shortName": "z",
}
)
with pytest.raises(TypeError):
message.set("centre", "ecmwf", 2)
with pytest.raises(ValueError):
message.set("stepRange", "0-12")
message.set({"stepType": "max", "stepRange": "0-12"})
def test_message_set_dict_no_checks():
with eccodes.FileReader(TEST_GRIB_DATA) as reader:
message = next(reader)
assert message.get("longitudeOfFirstGridPoint") == 344250000
assert message.get("longitudeOfLastGridPoint") == 16125000
message.set("swapScanningX", 1, check_values=False)
assert message.get("longitudeOfFirstGridPoint") == 16125000
assert message.get("longitudeOfLastGridPoint") == 344250000
def test_message_iter():
with eccodes.FileReader(TEST_GRIB_DATA2) as reader:
message = next(reader)
keys = list(message)
assert len(keys) >= 192
assert keys[-1] == "7777"
assert "centre" in keys
assert "shortName" in keys
keys2 = list(message.keys())
assert keys == keys2
items = collections.OrderedDict(message.items())
assert list(items.keys()) == keys
assert items["shortName"] == "z"
assert items["centre"] == "ecmf"
values = list(message.values())
assert values[keys.index("shortName")] == "z"
assert values[keys.index("centre")] == "ecmf"
assert values[-1] == "7777"
def test_message_iter_missingvalues():
missing_key = "level"
with eccodes.FileReader(TEST_GRIB_DATA2) as reader:
message = next(reader)
message[missing_key] = 42
message.set_missing(missing_key)
assert missing_key not in set(message)
assert missing_key not in set(message.keys())
assert missing_key not in dict(message.items())
def test_message_copy():
with eccodes.FileReader(TEST_GRIB_DATA2) as reader:
message = next(reader)
message2 = message.copy()
assert list(message.keys()) == list(message2.keys())
def test_write_message(tmp_path):
with eccodes.FileReader(TEST_GRIB_DATA2) as reader1:
fname = tmp_path / "foo.grib"
written = []
with open(fname, "wb") as fout:
for message in itertools.islice(reader1, 15):
message.write_to(fout)
written.append(message)
with eccodes.FileReader(fname) as reader2:
for message1, message2 in itertools.zip_longest(written, reader2):
assert message1 is not None
assert message2 is not None
for key in [
"edition",
"centre",
"typeOfLevel",
"level",
"dataDate",
"stepRange",
"dataType",
"shortName",
"packingType",
"gridType",
"number",
]:
assert message1[key] == message2[key]
assert np.all(message1.data == message2.data)
def test_message_from_samples():
message = eccodes.GRIBMessage.from_samples("regular_ll_sfc_grib2")
assert message["edition"] == 2
assert message["gridType"] == "regular_ll"
assert message["levtype"] == "sfc"
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