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# (C) Copyright 2005- ECMWF.
#
# This software is licensed under the terms of the Apache Licence Version 2.0
# which can be obtained at http://www.apache.org/licenses/LICENSE-2.0.
#
# In applying this licence, ECMWF does not waive the privileges and immunities granted to it by
# virtue of its status as an intergovernmental organisation nor does it submit to any jurisdiction.
#
# Python implementation: bufr_read_tropical_cyclone
#
# Description: how to read data of the ECMWF EPS tropical cyclone tracks encoded in BUFR format.
#
import getopt
import os
import sys
import traceback
from eccodes import *
VERBOSE = 1 # verbose error reporting
default_namespace = "ls"
def do_print(namespace, INPUT):
f = open(INPUT, "rb")
first_time = True
print("{")
print(' "messages" : [')
while 1:
gid = codes_grib_new_from_file(f)
if gid is None:
break
if not first_time:
print(" ,{")
else:
print(" {")
first_time = False
iterid = codes_keys_iterator_new(gid, namespace)
f1 = True
while codes_keys_iterator_next(iterid):
keyname = codes_keys_iterator_get_name(iterid)
keyval = codes_get_string(gid, keyname)
if not f1:
print(",")
else:
print("")
f1 = False
print(' "%s" : "%s"' % (keyname, keyval), end=" ")
print("")
print(" }")
codes_keys_iterator_delete(iterid)
codes_release(gid)
print(" ]")
print("}")
f.close()
def usage():
progname = os.path.basename(sys.argv[0])
print("Usage: ", progname, "[options] grib_file1 grib_file2 ...")
print("Options:")
print("\t-n namespace")
print("\t\tAll the keys belonging to namespace are printed.")
print("\t-m Mars keys are printed.")
print("")
def main():
if len(sys.argv) < 2:
usage()
return 1
try:
options = "mn:"
namespace = default_namespace
opts, args = getopt.getopt(sys.argv[1:], options)
for o, a in opts:
if o == "-m":
namespace = "mars"
elif o == "-n":
namespace = a or default_namespace
else:
assert False, "Invalid option"
# Check we have some GRIB files to process
if not args:
usage()
return 1
for arg in args:
do_print(namespace, arg)
except getopt.GetoptError as err:
print("Error: ", err)
usage()
return 1
except CodesInternalError as err:
if VERBOSE:
traceback.print_exc(file=sys.stderr)
else:
print(err.msg, file=sys.stderr)
return 1
if __name__ == "__main__":
sys.exit(main())
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