working with zarr in zip

kerchunk/netCDF3.py

@@ -59,6 +59,7 @@ def __init__(
         self.threshold = inline_threshold
         self.max_chunk_size = max_chunk_size
         self.out = {}
+        self.storage_options = storage_options
         with fsspec.open(filename, **(storage_options or {})) as fp:
             super().__init__(
                 fp, *args, mmap=False, mode="r", maskandscale=False, **kwargs
@@ -259,7 +260,7 @@ def translate(self):
         )
 
         if self.threshold > 0:
-            out = do_inline(out, self.threshold)
+            out = do_inline(out, self.threshold, remote_options=self.storage_options)
         out = _encode_for_JSON(out)
 
         return {"version": 1, "refs": out}

kerchunk/tests/test_zarr.py

@@ -0,0 +1,65 @@
+import xarray as xr
+import pandas as pd
+import pytest
+import numpy as np
+
+import kerchunk.zarr
+import kerchunk.utils
+
+
+@pytest.fixture(scope="module")
+def ds():
+    ds = xr.Dataset(
+        {
+            "x": xr.DataArray(np.linspace(-np.pi, np.pi, 10), dims=["x"]),
+            "y": xr.DataArray(np.linspace(-np.pi / 2, np.pi / 2, 10), dims=["y"]),
+            "time": xr.DataArray(pd.date_range("2020", "2021"), dims=["time"]),
+        },
+    )
+    ds["temp"] = (
+        np.cos(ds.x)
+        * np.sin(ds.y)
+        * xr.ones_like(ds.time).astype("float")
+        * np.random.random(ds.time.shape)
+    )
+    return ds
+
+
+@pytest.fixture
+def zarr_in_zip(tmpdir, ds):
+    def _zip(file):
+        import os
+        import zipfile
+
+        filename = file + os.path.extsep + "zip"
+        with zipfile.ZipFile(
+            filename, "w", compression=zipfile.ZIP_STORED, allowZip64=True
+        ) as fh:
+            for root, _, filenames in os.walk(file):
+                for each_filename in filenames:
+                    each_filename = os.path.join(root, each_filename)
+                    fh.write(each_filename, os.path.relpath(each_filename, file))
+        return filename
+
+    fn = f"{tmpdir}/test.zarr"
+    ds.to_zarr(fn, mode="w")
+    return _zip(fn)
+
+
+def test_zarr_in_zip(zarr_in_zip, ds):
+    out = kerchunk.zarr.ZarrToZarr(
+        url="zip://", storage_options={"fo": zarr_in_zip}
+    ).translate()
+    ds2 = xr.open_dataset(
+        "reference://",
+        engine="zarr",
+        backend_kwargs={
+            "storage_options": {
+                "fo": out,
+                "remote_protocol": "zip",
+                "remote_options": {"fo": zarr_in_zip},
+            },
+            "consolidated": False,
+        },
+    )
+    assert ds.equals(ds2)

kerchunk/utils.py

@@ -134,13 +134,18 @@ def _encode_for_JSON(store):
     return store
 
 
-def do_inline(store, threshold, remote_options=None):
+def do_inline(store, threshold, remote_options=None, remote_protocol=None):
     """Replace short chunks with the value of that chunk
 
     The chunk may need encoding with base64 if not ascii, so actual
     length may be larger than threshold.
     """
-    fs = fsspec.filesystem("reference", fo=store, **(remote_options or {}))
+    fs = fsspec.filesystem(
+        "reference",
+        fo=store,
+        remote_options=remote_options,
+        remote_protocol=remote_protocol,
+    )
     out = fs.references.copy()
     get_keys = [
         k

kerchunk/zarr.py

@@ -24,7 +24,8 @@ def single_zarr(uri_or_store, storage_options=None, inline_threshold=100, inline
             refs[k] = mapper[k]
         else:
             refs[k] = [fsspec.utils._unstrip_protocol(mapper._key_to_str(k), mapper.fs)]
-    refs = do_inline(refs, inline_threshold)
+    if inline_threshold:
+        refs = do_inline(refs, inline_threshold, remote_options=storage_options)
     return refs
 
 

setup.py

@@ -29,7 +29,7 @@
             "fill_hdf_strings = kerchunk.codecs:FillStringsCodec",
             "FITSAscii = kerchunk.codecs:AsciiTableCodec",
             "FITSVarBintable = kerchunk.codecs:VarArrCodec",
-            "record_member = kerchunk.codecs.RecordArrayMember",
+            "record_member = kerchunk.codecs:RecordArrayMember",
         ],
     },
     zip_safe=False,