gstlal_query_gwosc_segments

#!/usr/bin/env python3
#
# Copyright (C) 2020-2021  Kipp Cannon, Patrick Godwin, Chad Hanna, Ryan Magee, Cody Messick
#
# This program is free software; you can redistribute it and/or modify it
# under the terms of the GNU General Public License as published by the
# Free Software Foundation; either version 2 of the License, or (at your
# option) any later version.
#
# This program is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General
# Public License for more details.
#
# You should have received a copy of the GNU General Public License along
# with this program; if not, write to the Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 
 
import argparse
import sys
 
from lal import LIGOTimeGPS
from ligo import segments
from ligo.lw import ligolw
from ligo.lw import utils as ligolw_utils
from ligo.lw.utils import process as ligolw_process
from ligo.lw.utils import segments as ligolw_segments
 
from gstlal.segments import query_gwosc_segments
 
#
# Define/parse command line options
#
 
parser = argparse.ArgumentParser(description='Download GWOSC segments.')
parser.add_argument("start", metavar="START", type=int, help="Set the start GPS time.")
parser.add_argument("end", metavar="END", type=int, help="Set the end GPS time.")
parser.add_argument("ifo", metavar="IFO", nargs="+", help="Set the instruments to process, e.g. H1.")
parser.add_argument("--no-cert", action="store_true", help="Turn off SSL certificate validation. Default: False.")
parser.add_argument("-o", "--output", metavar="file", default="segments.xml.gz", help="Set the name of the segments file generated. Default: segments.xml.gz")
args = parser.parse_args()
 
span = segments.segment(LIGOTimeGPS(args.start), LIGOTimeGPS(args.end))
instruments = set([])
for x in args.ifo:
    # assume all instruments are two characters and split combos like H1L1 if they exist
    instruments |= set([x[i*2:i*2+2] for i in range(int(len(x) / 2))])
 
#
# Query segments
#
 
print("Downloading segment lists ...", file=sys.stderr)
segments = query_gwosc_segments(instruments, args.start, args.end, verify_certs=(not args.no_cert))
 
#
# Write segments to disk
#
 
xmldoc = ligolw.Document()
xmldoc.appendChild(ligolw.LIGO_LW())
process = ligolw_process.register_to_xmldoc(xmldoc, sys.argv[0], vars(args))
with ligolw_segments.LigolwSegments(xmldoc, process) as lwseglists:
    lwseglists.insert_from_segmentlistdict(segments, "datasegments")
process.set_end_time_now()
 
ligolw_utils.write_filename(xmldoc, args.output, verbose=True)
xmldoc.unlink()