Add intake_xarray_kwargs to ThreddsCatalog

intake_thredds/cat.py

@@ -11,6 +11,8 @@ class ThreddsCatalog(Catalog):
         Location of thredds catalog.
     driver : str
         Select driver to access data. Choose from 'netcdf' and 'opendap'.
+    intake_xarray_kwargs : dict
+        Keyword arguments to pass to intake_xarray DataSource.
     **kwargs :
         Additional keyword arguments are passed through to the
         :py:class:`~intake.catalog.Catalog` base class.
@@ -24,9 +26,10 @@ class ThreddsCatalog(Catalog):
 
     name = 'thredds_cat'
 
-    def __init__(self, url: str, driver: str = 'opendap', **kwargs):
+    def __init__(self, url: str, driver: str = 'opendap', intake_xarray_kwargs=None, **kwargs):
         self.url = url
         self.driver = driver
+        self.intake_xarray_kwargs = intake_xarray_kwargs or {'chunks': {}}
         super().__init__(**kwargs)
 
     def _load(self):
@@ -77,14 +80,19 @@ def access_urls(ds, self):
                 url = f'{self.metadata["fsspec_pre_url"]}{url}'
             return url
 
+        def _update_args(ds):
+            args = self.intake_xarray_kwargs.copy()
+            args.update({'urlpath': access_urls(ds, self)})
+            return args
+
         self._entries.update(
             {
                 ds.name: LocalCatalogEntry(
                     ds.name,
                     'THREDDS data',
                     self.driver,
                     True,
-                    {'urlpath': access_urls(ds, self), 'chunks': {}},
+                    _update_args(ds),
                     [],
                     [],
                     {},

tests/test_cat.py

@@ -70,3 +70,18 @@ def test_ThreddsCatalog_simplecache_fails_opendap(thredds_cat_url):
     """Test that ThreddsCatalog simplecache:: in url with opendap."""
     with pytest.raises(ValueError, match=r'simplecache requires driver="netcdf"'):
         intake.open_thredds_cat(f'simplecache::{thredds_cat_url}', driver='opendap')
+
+
+def test_ThreddsCatalog_intake_xarray_kwargs():
+    """Test that ThreddsCatalog allows intake_xarray kwargs."""
+    cat = intake.open_thredds_cat(
+        'https://psl.noaa.gov/thredds/catalog/Datasets/noaa.ersst/catalog.xml',
+        driver='netcdf',
+        intake_xarray_kwargs={
+            'xarray_kwargs': {'decode_times': False, 'engine': 'scipy'},
+            'chunks': {},
+        },
+    )
+    entry = cat['sst.mon.19712000.ltm.v3.nc']
+    ds = entry(chunks={}).to_dask()
+    assert isinstance(ds, xr.Dataset)