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import io
import shutil
import tempfile
import pytest
from pyfdb.pyfdb import FDB
def test_datahandle_repr(read_only_fdb_setup):
fdb = FDB(read_only_fdb_setup)
selection = {
"type": "an",
"class": "ea",
"domain": "g",
"expver": "0001",
"stream": "oper",
"date": "20200101",
"levtype": "sfc",
"step": "0",
"param": ["167", "165", "166"],
"time": "1800",
}
data_handle = fdb.retrieve(selection)
assert "Closed" in repr(data_handle)
data_handle.open()
assert "Opened" in repr(data_handle)
def test_datahandle_not_opened_before_read(read_only_fdb_setup):
fdb = FDB(read_only_fdb_setup)
selection = {
"type": "an",
"class": "ea",
"domain": "g",
"expver": "0001",
"stream": "oper",
"date": "20200101",
"levtype": "sfc",
"step": "0",
"param": ["167", "165", "166"],
"time": "1800",
}
data_handle = fdb.retrieve(selection)
assert data_handle
with pytest.raises(
RuntimeError,
match="DataHandle: Read occured before the handle was opened. Must be opened first.",
):
assert data_handle.read(4) == b"GRIB"
def test_datahandle_consecutive_read(read_only_fdb_setup):
fdb = FDB(read_only_fdb_setup)
selection = {
"type": "an",
"class": "ea",
"domain": "g",
"expver": "0001",
"stream": "oper",
"date": "20200101",
"levtype": "sfc",
"step": "0",
"param": ["167", "165", "166"],
"time": "1800",
}
data_handle = fdb.retrieve(selection)
assert data_handle
# Check the GRIB header
data_handle.open()
assert data_handle.read(4) == b"GRIB"
assert data_handle.read(4) != b"GRIB"
def test_datahandle_readinto(read_only_fdb_setup):
fdb = FDB(read_only_fdb_setup)
selection = {
"type": "an",
"class": "ea",
"domain": "g",
"expver": "0001",
"stream": "oper",
"date": "20200101",
"levtype": "sfc",
"step": "0",
"param": ["167", "165", "166"],
"time": "1800",
}
with fdb.retrieve(selection) as data_handle:
assert data_handle
chunk_buf = bytearray(4)
mv = memoryview(chunk_buf)
data_handle.readinto(mv)
assert chunk_buf == b"GRIB"
assert data_handle.read(4) != b"GRIB"
def test_datahandle_readinto_non_opened(read_only_fdb_setup):
fdb = FDB(read_only_fdb_setup)
selection = {
"type": "an",
"class": "ea",
"domain": "g",
"expver": "0001",
"stream": "oper",
"date": "20200101",
"levtype": "sfc",
"step": "0",
"param": ["167", "165", "166"],
"time": "1800",
}
data_handle = fdb.retrieve(selection)
assert data_handle
chunk_buf = bytearray(4)
mv = memoryview(chunk_buf)
with pytest.raises(RuntimeError):
data_handle.readinto(mv)
def test_datahandle_read_all(read_only_fdb_setup):
fdb = FDB(read_only_fdb_setup)
selection = {
"type": "an",
"class": "ea",
"domain": "g",
"expver": "0001",
"stream": "oper",
"date": "20200101",
"levtype": "sfc",
"step": "0",
"param": ["167", "165", "166"],
"time": "1800",
}
data_handle = fdb.retrieve(selection)
# Check the GRIB header
assert data_handle
assert data_handle.readall()[0:4] == b"GRIB"
data_handle.close()
def test_datahandle_cmp_read_read_all(read_only_fdb_setup):
fdb = FDB(read_only_fdb_setup)
selection = {
"type": "an",
"class": "ea",
"domain": "g",
"expver": "0001",
"stream": "oper",
"date": "20200101",
"levtype": "sfc",
"step": "0",
"param": ["167", "165", "166"],
"time": "1800",
}
data_handle = fdb.retrieve(selection)
data_handle_2 = fdb.retrieve(selection)
assert data_handle
assert data_handle_2
data_handle_2.open()
# Read all the data from data_handle
data = data_handle.readall()
data_2 = data_handle_2.read(len(data))
assert data == data_2
data_handle.open()
print(data_handle.read(4))
print(data_handle_2.read(4))
def test_datahandle_not_opened_before_read_context_manager(read_only_fdb_setup):
fdb = FDB(read_only_fdb_setup)
selection = {
"type": "an",
"class": "ea",
"domain": "g",
"expver": "0001",
"stream": "oper",
"date": "20200101",
"levtype": "sfc",
"step": "0",
"param": ["167", "165", "166"],
"time": "1800",
}
with fdb.retrieve(selection) as data_handle:
# Check the GRIB header
assert data_handle
assert data_handle.read(4) == b"GRIB"
def test_datahandle_not_opened_before_read_all_context_manager(read_only_fdb_setup):
fdb = FDB(read_only_fdb_setup)
selection = {
"type": "an",
"class": "ea",
"domain": "g",
"expver": "0001",
"stream": "oper",
"date": "20200101",
"levtype": "sfc",
"step": "0",
"param": ["167", "165", "166"],
"time": "1800",
}
with fdb.retrieve(selection) as data_handle:
assert data_handle
assert data_handle.readall()
def test_datahandle_size(read_only_fdb_setup):
fdb = FDB(read_only_fdb_setup)
selection = {
"type": "an",
"class": "ea",
"domain": "g",
"expver": "0001",
"stream": "oper",
"date": "20200101",
"levtype": "sfc",
"step": "0",
"param": ["167", "165", "166"],
"time": "1800",
}
with fdb.retrieve(selection) as data_handle:
assert data_handle.size() == 10732
def test_datahandle_size_without_open(read_only_fdb_setup):
fdb = FDB(read_only_fdb_setup)
selection = {
"type": "an",
"class": "ea",
"domain": "g",
"expver": "0001",
"stream": "oper",
"date": "20200101",
"levtype": "sfc",
"step": "0",
"param": ["167", "165", "166"],
"time": "1800",
}
data_handle = fdb.retrieve(selection)
assert data_handle.size() == 10732
def test_datahandle_readinto_shutil_copyfileobj_cmp(read_only_fdb_setup):
fdb = FDB(read_only_fdb_setup)
selection = {
"type": "an",
"class": "ea",
"domain": "g",
"expver": "0001",
"stream": "oper",
"date": "20200101",
"levtype": "sfc",
"step": "0",
"param": ["167", "165", "166"],
"time": "1800",
}
dst_read_into = io.BytesIO(b"")
with fdb.retrieve(selection) as data_handle:
assert data_handle
print("Reading with shutil")
shutil.copyfileobj(data_handle, dst_read_into)
# reset position in file
dst_read_into.seek(0)
content_read_into = dst_read_into.read()
with fdb.retrieve(selection) as data_handle:
assert data_handle
content_read_all = data_handle.readall()
assert len(content_read_all) == len(content_read_into)
assert content_read_all == content_read_into
def test_datahandle_readinto_shutil_copyfileobj_tmp_file(read_only_fdb_setup):
fdb = FDB(read_only_fdb_setup)
selection = {
"type": "an",
"class": "ea",
"domain": "g",
"expver": "0001",
"stream": "oper",
"date": "20200101",
"levtype": "sfc",
"step": "0",
"param": ["167", "165", "166"],
"time": "1800",
}
with tempfile.TemporaryFile() as out:
with fdb.retrieve(selection) as data_handle:
assert data_handle
shutil.copyfileobj(data_handle, out)
out.flush()
out.seek(0)
content_read_into = out.read(-1)
with fdb.retrieve(selection) as data_handle:
assert data_handle
content_read_all = data_handle.readall()
assert len(content_read_all) == len(content_read_into)
assert content_read_all == content_read_into
def test_data_handle_readinto_attr(read_only_fdb_setup):
fdb = FDB(read_only_fdb_setup)
selection = {
"type": "an",
"class": "ea",
"domain": "g",
"expver": "0001",
"stream": "oper",
"date": "20200101",
"levtype": "sfc",
"step": "0",
"param": ["167", "165", "166"],
"time": "1800",
}
with fdb.retrieve(selection) as data_handle:
assert hasattr(data_handle, "readinto")
def test_data_handle_read_minus_one(read_only_fdb_setup):
fdb_config_path = read_only_fdb_setup
assert fdb_config_path
fdb = FDB(fdb_config_path)
selection = {
"type": "an",
"class": "ea",
"domain": "g",
"expver": "0001",
"stream": "oper",
"date": "20200101",
"levtype": "sfc",
"step": "0",
"param": ["167", "165", "166"],
"time": "1800",
}
content_read_minus_one = None
content_read_all = None
with fdb.retrieve(selection) as data_handle:
content_read_minus_one = data_handle.read(-1)
content_read_all = data_handle.readall()
assert content_read_all
assert content_read_minus_one
assert len(content_read_minus_one) > 0
assert len(content_read_all) > 0
assert content_read_all == content_read_minus_one
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