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Check dependencies before dispatch. #438

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Check dependencies before dispatch. #438

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28 changes: 25 additions & 3 deletions tiled/client/node.py
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Original file line number Diff line number Diff line change
Expand Up @@ -17,7 +17,7 @@
from ..utils import UNCHANGED, OneShotCachedMap, Sentinel, node_repr
from .base import BaseClient
from .cache import Revalidate, verify_cache
from .utils import ClientError, client_for_item, export_util
from .utils import ClientError, client_for_item, export_util, modules_available


class Node(BaseClient, collections.abc.Mapping, IndexersMixin):
Expand Down Expand Up @@ -884,11 +884,14 @@ def __index__(self):

class _LazyLoad:
# This exists because lambdas and closures cannot be pickled.
def __init__(self, import_module_args, attr_name):
def __init__(self, import_module_args, attr_name, check=None):
self.import_module_args = import_module_args
self.attr_name = attr_name
self.check = check

def __call__(self):
if self.check is not None:
self.check()
return getattr(
importlib.import_module(*self.import_module_args), self.attr_name
)
Expand All @@ -903,14 +906,33 @@ def __call__(self):
return self.obj


class MissingExtraDependency(ImportError):
pass


def _check_xarray():
if not modules_avaialble("xarray"):
raise MissingExtraDepenency(
"""The structure can be read into an xarray.Dataset, but xarray is not installed.

You can install xarray with pip:

pip install xarray

or conda:

conda install -c conda-forge xarray
""")


DEFAULT_STRUCTURE_CLIENT_DISPATCH = {
"numpy": OneShotCachedMap(
{
"node": _Wrap(Node),
"array": _LazyLoad(("..array", Node.__module__), "ArrayClient"),
"dataframe": _LazyLoad(("..dataframe", Node.__module__), "DataFrameClient"),
"sparse": _LazyLoad(("..sparse", Node.__module__), "SparseClient"),
"xarray_dataset": _LazyLoad(("..xarray", Node.__module__), "DatasetClient"),
"xarray_dataset": _LazyLoad(("..xarray", Node.__module__), "DatasetClient", _check_xarray),
}
),
"dask": OneShotCachedMap(
Expand Down