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Added initial code for local index definition of grib files. #512

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Added initial code for local index definition of grib files. #512

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b5ca9c0
added code for local idx definitions
Anu-Ra-g Sep 28, 2024
cfc04e0
made some fixes
Anu-Ra-g Sep 28, 2024
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21 changes: 21 additions & 0 deletions kerchunk/grib2.py
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Original file line number Diff line number Diff line change
Expand Up @@ -5,6 +5,8 @@
from collections import defaultdict
from typing import Iterable, List, Dict, Set
import ujson
import datetime as dt
import pytz

import fsspec
import zarr
Expand Down Expand Up @@ -112,6 +114,7 @@ def scan_grib(
inline_threshold=100,
skip=0,
filter={},
idx=False,
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Pass a filename or maybe open file?
Dumping a load of files into the local directory doesn't seem like a great idea.

) -> List[Dict]:
"""
Generate references for a GRIB2 file
Expand Down Expand Up @@ -149,6 +152,10 @@ def scan_grib(
# These are present by default
# TIME_DIMS = ["step", "time", "valid_time"]

count = 1
if idx:
idx_f = open(f"{url.split('/')[-1]}.idx", "a")

out = []
with fsspec.open(url, "rb", **storage_options) as f:
logger.debug(f"File {url}")
Expand Down Expand Up @@ -267,6 +274,18 @@ def scan_grib(
)
continue

if idx and coord in ["time", "valid_time"]:
line = ""
if coord == "time":
time = dt.datetime.fromtimestamp(x, tz=pytz.UTC)
line = f"{count}:{offset}:d={time.strftime('%Y%m%d%H')}:{varName.upper()}"
count += 1
elif coord == "valid_time":
valid_time = dt.datetime.fromtimestamp(x, tz=pytz.UTC)
diff = int((valid_time - time).total_seconds() / 3600)
line += f":{diff} hour fcst\n"
idx_f.write(line)

if x is None:
continue
coordinates.append(coord)
Expand Down Expand Up @@ -318,6 +337,8 @@ def scan_grib(
"templates": {"u": url},
}
)
if idx:
idx_f.close()
logger.debug("Done")
return out

Expand Down
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