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authorLars-Dominik Braun <lars@6xq.net>2018-05-05 10:39:49 +0200
committerLars-Dominik Braun <lars@6xq.net>2018-05-05 10:39:49 +0200
commitf3a7115648be5d60b6afb74ca62370f347e10df2 (patch)
treed1ec437a5483a72c61f54a3566351e9971e54422
parent1882062b5c5cacea60db922971538f6b4f6a8c27 (diff)
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contrib: Add WARC merging script
Very useful for distributed, recursive crawls which create one WARC per page.
-rwxr-xr-xcontrib/mergeWarc.py70
1 files changed, 70 insertions, 0 deletions
diff --git a/contrib/mergeWarc.py b/contrib/mergeWarc.py
new file mode 100755
index 0000000..9442010
--- /dev/null
+++ b/contrib/mergeWarc.py
@@ -0,0 +1,70 @@
+#!/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))
+