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import os.path
import numpy as np
import pytest
from eccodes import messages
SAMPLE_DATA_FOLDER = os.path.join(os.path.dirname(__file__), "sample-data")
TEST_DATA = os.path.join(SAMPLE_DATA_FOLDER, "era5-levels-members.grib")
def _test_Message_read():
with open(TEST_DATA) as file:
res1 = messages.Message.from_file(file)
assert res1.message_get("paramId") == 129
assert res1["paramId"] == 129
assert list(res1)[0] == "globalDomain"
assert list(res1.message_grib_keys("time"))[0] == "dataDate"
assert "paramId" in res1
assert len(res1) > 100
with pytest.raises(KeyError):
res1["non-existent-key"]
assert res1.message_get("non-existent-key", default=1) == 1
res2 = messages.Message.from_message(res1)
for (k2, v2), (k1, v1) in zip(res2.items(), res1.items()):
assert k2 == k1
if isinstance(v2, np.ndarray) or isinstance(v1, np.ndarray):
assert np.allclose(v2, v1)
else:
assert v2 == v1
with open(TEST_DATA) as file:
with pytest.raises(EOFError):
while True:
messages.Message.from_file(file)
def test_Message_write(tmpdir):
res = messages.Message.from_sample_name("regular_ll_pl_grib2")
assert res["gridType"] == "regular_ll"
res.message_set("Ni", 20)
assert res["Ni"] == 20
res["iDirectionIncrementInDegrees"] = 1.0
assert res["iDirectionIncrementInDegrees"] == 1.0
res.message_set("gridType", "reduced_gg")
assert res["gridType"] == "reduced_gg"
res["pl"] = [2.0, 3.0]
assert np.allclose(res["pl"], [2.0, 3.0])
# warn on errors
res["centreDescription"] = "DUMMY"
assert res["centreDescription"] != "DUMMY"
res["edition"] = -1
assert res["edition"] != -1
# ignore errors
res.errors = "ignore"
res["centreDescription"] = "DUMMY"
assert res["centreDescription"] != "DUMMY"
# raise errors
res.errors = "raise"
with pytest.raises(KeyError):
res["centreDescription"] = "DUMMY"
with pytest.raises(NotImplementedError):
del res["gridType"]
out = tmpdir.join("test.grib")
with open(str(out), "wb") as file:
res.write(file)
def _test_ComputedKeysMessage_read():
computed_keys = {
"ref_time": (lambda m: str(m["dataDate"]) + str(m["dataTime"]), None),
"error_key": (lambda m: 1 / 0, None),
"centre": (lambda m: -1, lambda m, v: None),
}
with open(TEST_DATA) as file:
res = messages.ComputedKeysMessage.from_file(file, computed_keys=computed_keys)
assert res["paramId"] == 129
assert res["ref_time"] == "201701010"
assert len(res) > 100
assert res["centre"] == -1
with pytest.raises(ZeroDivisionError):
res["error_key"]
def test_ComputedKeysMessage_write():
computed_keys = {
"ref_time": (lambda m: "%s%04d" % (m["dataDate"], m["dataTime"]), None),
"error_key": (lambda m: 1 / 0, None),
"centre": (lambda m: -1, lambda m, v: None),
}
res = messages.ComputedKeysMessage.from_sample_name(
"regular_ll_pl_grib2", computed_keys=computed_keys
)
res["dataDate"] = 20180101
res["dataTime"] = 0
assert res["ref_time"] == "201801010000"
res["centre"] = 1
def test_compat_create_exclusive(tmpdir):
test_file = tmpdir.join("file.grib.idx")
try:
with messages.compat_create_exclusive(str(test_file)):
raise RuntimeError("Test remove")
except RuntimeError:
pass
with messages.compat_create_exclusive(str(test_file)) as file:
file.write(b"Hi!")
with pytest.raises(OSError):
with messages.compat_create_exclusive(str(test_file)) as file:
file.write(b"Hi!")
def _test_FileIndex():
res = messages.FileIndex.from_filestream(
messages.FileStream(TEST_DATA), ["paramId"]
)
assert res["paramId"] == [129, 130]
assert len(res) == 1
assert list(res) == ["paramId"]
assert res.first()
with pytest.raises(ValueError):
res.getone("paramId")
with pytest.raises(KeyError):
res["non-existent-key"]
subres = res.subindex(paramId=130)
assert subres.get("paramId") == [130]
assert subres.getone("paramId") == 130
assert len(subres) == 1
def _test_FileIndex_from_indexpath_or_filestream(tmpdir):
grib_file = tmpdir.join("file.grib")
with open(TEST_DATA, "rb") as file:
grib_file.write_binary(file.read())
# create index file
res = messages.FileIndex.from_indexpath_or_filestream(
messages.FileStream(str(grib_file)), ["paramId"]
)
assert isinstance(res, messages.FileIndex)
# read index file
res = messages.FileIndex.from_indexpath_or_filestream(
messages.FileStream(str(grib_file)), ["paramId"]
)
assert isinstance(res, messages.FileIndex)
# do not read nor create the index file
res = messages.FileIndex.from_indexpath_or_filestream(
messages.FileStream(str(grib_file)), ["paramId"], indexpath=""
)
assert isinstance(res, messages.FileIndex)
# can't create nor read index file
res = messages.FileIndex.from_indexpath_or_filestream(
messages.FileStream(str(grib_file)),
["paramId"],
indexpath=str(tmpdir.join("non-existent-folder").join("non-existent-file")),
)
assert isinstance(res, messages.FileIndex)
# trigger mtime check
grib_file.remove()
with open(TEST_DATA, "rb") as file:
grib_file.write_binary(file.read())
res = messages.FileIndex.from_indexpath_or_filestream(
messages.FileStream(str(grib_file)), ["paramId"]
)
assert isinstance(res, messages.FileIndex)
def _test_FileIndex_errors():
class MyMessage(messages.ComputedKeysMessage):
computed_keys = {"error_key": lambda m: 1 / 0}
stream = messages.FileStream(TEST_DATA, message_class=MyMessage)
res = messages.FileIndex.from_filestream(stream, ["paramId", "error_key"])
assert res["paramId"] == [129, 130]
assert len(res) == 2
assert list(res) == ["paramId", "error_key"]
assert res["error_key"] == ["undef"]
def _test_FileStream():
res = messages.FileStream(TEST_DATA)
leader = res.first()
assert len(leader) > 100
assert sum(1 for _ in res) == leader["count"]
assert len(res.index(["paramId"])) == 1
# __file__ is not a GRIB, but contains the "GRIB" string, so it is a very tricky corner case
res = messages.FileStream(str(__file__))
with pytest.raises(EOFError):
res.first()
res = messages.FileStream(str(__file__), errors="ignore")
with pytest.raises(EOFError):
res.first()
# res = messages.FileStream(str(__file__), errors='raise')
# with pytest.raises(bindings.EcCodesError):
# res.first()
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