Function test_batchdap4_downloads

xarray/tests/test_backends.py:6692–6726

Test that in dap4, all dimensions are downloaded at once

(tmpdir, protocol)

@network
@pytest.mark.parametrize("protocol", ["dap2", "dap4"])
def test_batchdap4_downloads(tmpdir, protocol) -> None:
    """Test that in dap4, all dimensions are downloaded at once"""
    import pydap
    from pydap.net import create_session

    _version_ = Version(pydap.__version__)
    # Create a session with pre-set params in pydap backend, to cache urls
    cache_name = tmpdir / "debug"
    session = create_session(use_cache=True, cache_kwargs={"cache_name": cache_name})
    session.cache.clear()
    url = "https://test.opendap.org/opendap/hyrax/data/nc/coads_climatology.nc"

    ds = open_dataset(
        url.replace("https", protocol),
        session=session,
        engine="pydap",
        decode_times=False,
    )

    if protocol == "dap4":
        if _version_ > Version("3.5.5"):
            # total downloads are:
            # 1 dmr + 1 dap (all dimensions at once)
            assert len(session.cache.urls()) == 2
            # now load the rest of the variables
            ds.load()
            # each non-dimension array is downloaded with an individual https requests
            assert len(session.cache.urls()) == 2 + 4
        else:
            assert len(session.cache.urls()) == 4
            ds.load()
            assert len(session.cache.urls()) == 4 + 4
    elif protocol == "dap2":
        # das + dds + 3 dods urls for dimensions alone
        assert len(session.cache.urls()) == 5


class TestEncodingInvalid: