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added support for s3 files #498

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merged 3 commits into from
Sep 3, 2024
Merged

added support for s3 files #498

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8622841
added support for s3 files
Anu-Ra-g Aug 30, 2024
aa66746
changed the parameter names
Anu-Ra-g Aug 30, 2024
48eeb2a
Merge branch 'main' into s3_support
Anu-Ra-g Sep 1, 2024
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21 changes: 12 additions & 9 deletions kerchunk/grib2.py
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Original file line number Diff line number Diff line change
Expand Up @@ -811,7 +811,9 @@ def extract_datatree_chunk_index(


def _map_grib_file_by_group(
fname: str, mapper: Optional[Callable] = None, storage_options=None
fname: str,
mapper: Optional[Callable] = None,
storage_options: Optional[Dict] = None,
) -> "pd.DataFrame":
"""
Helper method used to read the cfgrib metadata associated with each message (group) in the grib file
Expand All @@ -831,6 +833,7 @@ def _map_grib_file_by_group(
import pandas as pd

mapper = (lambda x: x) if mapper is None else mapper
references = scan_grib(fname, storage_options=storage_options)

with warnings.catch_warnings():
warnings.simplefilter("ignore")
Expand All @@ -842,24 +845,22 @@ def _map_grib_file_by_group(
lambda item: item is not None,
[
# extracting the metadata from a single message
_extract_single_group(mapper(group), i)
for i, group in enumerate(
scan_grib(fname, storage_options=storage_options), start=1
)
_extract_single_group(mapper(group), i, storage_options)
for i, group in enumerate(references, start=1)
],
)
)
).set_index("idx")


def _extract_single_group(grib_group: dict, idx: int):
# This function, returns the grib metadata as a dataframe, on a per message basis.
def _extract_single_group(grib_group: dict, idx: int, storage_options: Dict):
import datatree

grib_tree_store = grib_tree(
[
grib_group,
]
],
storage_options,
)

if len(grib_tree_store["refs"]) <= 1:
Expand Down Expand Up @@ -917,7 +918,9 @@ def build_idx_grib_mapping(
import pandas as pd

grib_file_index = _map_grib_file_by_group(
fname=basename, mapper=mapper, storage_options=storage_options
fname=basename,
mapper=mapper,
storage_options=storage_options,
)
idx_file_index = parse_grib_idx(
basename=basename, suffix=suffix, storage_options=storage_options
Expand Down
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