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#!/usr/bin/env python3
# Copyright (c) 2018 crocoite contributors
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
# THE SOFTWARE.
"""
Merge multiple WARC files into a single file, writing revisit records for items
which occur multiple times
"""
import shutil, sys, re, os, logging
from warcio.archiveiterator import ArchiveIterator
from warcio.warcwriter import WARCWriter
if __name__ == '__main__':
import argparse
parser = argparse.ArgumentParser(description='Merge WARCs, reads filenames from stdin.')
parser.add_argument('--verbose', '-v', action='store_true')
parser.add_argument('output', type=argparse.FileType ('wb'), help='Output WARC')
args = parser.parse_args()
loglevel = logging.DEBUG if args.verbose else logging.INFO
logging.basicConfig (level=loglevel)
unique = 0
revisit = 0
payloadMap = {}
writer = WARCWriter (args.output, gzip=True)
for l in sys.stdin:
l = l.strip ()
with open (l, 'rb') as fd:
for record in ArchiveIterator (fd):
if record.rec_type in {'resource', 'response'}:
headers = record.rec_headers
rid = headers.get_header('WARC-Record-ID')
csum = headers.get_header('WARC-Payload-Digest')
dup = payloadMap.get (csum, None)
if dup is None:
payloadMap[csum] = {'uri': headers.get_header('WARC-Target-URI'),
'id': rid, 'date': headers.get_header('WARC-Date')}
unique += 1
else:
logging.debug ('Record {} is duplicate of {}'.format (rid, dup['id']))
record = writer.create_revisit_record (dup['uri'], csum, dup['uri'], dup['date'])
record.rec_headers.add_header ('WARC-Truncated', 'length')
record.rec_headers.add_header ('WARC-Refers-To', dup['id'])
revisit += 1
else:
unique += 1
writer.write_record (record)
logging.info ('Wrote {} unique records, {} revisits'.format (unique, revisit))
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