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#!/usr/bin/env python3
"""
Streaming Hadoop script to import CDX metadata into the HBase fulltext table,
primarily for URL-agnostic crawl de-duplication. Takes only "fulltext" file
formats.
Requires:
- happybase
- mrjob
TODO:
- argparse
- refactor into an object
- tests in separate file
- nose tests
- sentry integration for error reporting
"""
import sys
import json
from datetime import datetime
import happybase
import mrjob
from mrjob.job import MRJob
NORMAL_MIME = (
'application/pdf',
'application/postscript',
'text/html',
'text/xml',
)
def normalize_mime(raw):
raw = raw.lower()
for norm in NORMAL_MIME:
if raw.startswith(norm):
return norm
# Special cases
if raw.startswith('application/xml'):
return 'text/xml'
if raw.startswith('application/x-pdf'):
return 'application/pdf'
return None
def test_normalize_mime():
assert normalize_mime("asdf") == None
assert normalize_mime("application/pdf") == "application/pdf"
assert normalize_mime("application/pdf+journal") == "application/pdf"
assert normalize_mime("Application/PDF") == "application/pdf"
assert normalize_mime("application/p") == None
assert normalize_mime("application/xml+stuff") == "text/xml"
def transform_line(raw_cdx):
cdx = raw_cdx.split()
if len(cdx) < 11:
return None
surt = cdx[0]
dt = cdx[1]
url = cdx[2]
mime = normalize_mime(cdx[3])
http_status = cdx[4]
key = cdx[5]
c_size = cdx[8]
offset = cdx[9]
warc = cdx[10]
if not (key.isalnum() and c_size.isdigit() and offset.isdigit()
and http_status == "200" and len(key) == 32 and dt.isdigit()):
return None
if '-' in (surt, dt, url, mime, http_status, key, c_size, offset, warc):
return None
key = "sha1:{}".format(key)
info = dict(surt=surt, dt=dt, url=url, c_size=int(c_size),
offset=int(offset), warc=warc)
warc_file = warc.split('/')[-1]
dt_iso = datetime.strptime(dt, "%Y%m%d%H%M%S").isoformat()
try:
dt_iso = datetime.strptime(dt, "%Y%m%d%H%M%S").isoformat()
except:
return None
# 'i' intentionally not set
heritrix = dict(u=url, d=dt_iso, f=warc_file, o=int(offset), c=1)
return {'key': key, 'file:mime': mime, 'file:cdx': info, 'f:c': heritrix}
def test_transform_line():
raw = "edu,upenn,ldc)/sites/www.ldc.upenn.edu/files/medar2009-large-arabic-broadcast-collection.pdf 20170828233154 https://www.ldc.upenn.edu/sites/www.ldc.upenn.edu/files/medar2009-large-arabic-broadcast-collection.pdf application/pdf 200 WL3FEA62TEU4F52Y5DOVQ62VET4QJW7G - - 210251 931661233 SEMSCHOLAR-PDF-CRAWL-2017-08-04-20170828231135742-00000-00009-wbgrp-svc284/SEMSCHOLAR-PDF-CRAWL-2017-08-04-20170828232253025-00005-3480~wbgrp-svc284.us.archive.org~8443.warc.gz"
correct = {
'key': "sha1:WL3FEA62TEU4F52Y5DOVQ62VET4QJW7G",
'file:mime': "application/pdf",
'file:cdx': {
'surt': "edu,upenn,ldc)/sites/www.ldc.upenn.edu/files/medar2009-large-arabic-broadcast-collection.pdf",
'url': "https://www.ldc.upenn.edu/sites/www.ldc.upenn.edu/files/medar2009-large-arabic-broadcast-collection.pdf",
'dt': "20170828233154",
'warc': "SEMSCHOLAR-PDF-CRAWL-2017-08-04-20170828231135742-00000-00009-wbgrp-svc284/SEMSCHOLAR-PDF-CRAWL-2017-08-04-20170828232253025-00005-3480~wbgrp-svc284.us.archive.org~8443.warc.gz",
'offset': 931661233,
'c_size': 210251,
},
'f:c': {
'u': "https://www.ldc.upenn.edu/sites/www.ldc.upenn.edu/files/medar2009-large-arabic-broadcast-collection.pdf",
'd': "2017-08-28T23:31:54",
'f': "SEMSCHOLAR-PDF-CRAWL-2017-08-04-20170828232253025-00005-3480~wbgrp-svc284.us.archive.org~8443.warc.gz",
'o': 931661233,
'c': 1,
}
}
assert transform_line(raw) == correct
assert transform_line(raw + "\n") == correct
assert transform_line(raw + " extra_field") == correct
class MRCDXBackfillHBase(MRJob):
# CDX lines in
INPUT_PROTOCOL = mrjob.protocol.RawValueProtocol
OUTPUT_PROTOCOL = mrjob.protocol.JSONValueProtocol
def configure_args(self):
super(MRCDXBackfillHBase, self).configure_args()
self.add_passthru_arg('--hbase-table',
type=str,
default='wbgrp-journal-extract-0-qa',
help='HBase table to backfill into (must exist)')
self.add_passthru_arg('--hbase-host',
type=str,
default='localhost',
help='HBase thrift API host to connect to')
def __init__(self, *args, **kwargs):
# Allow passthrough for tests
if 'hb_table' in kwargs:
self.hb_table = kwargs.pop('hb_table')
else:
self.hb_table = None
super(MRCDXBackfillHBase, self).__init__(*args, **kwargs)
self.mime_filter = ['application/pdf']
def mapper_init(self):
if self.hb_table is None:
try:
host = self.options.hbase_host
# TODO: make these configs accessible from... mrconf.cfg?
hb_conn = happybase.Connection(host=host, transport="framed",
protocol="compact")
except Exception as err:
raise Exception("Couldn't connect to HBase using host: {}".format(host))
self.hb_table = hb_conn.table(self.options.hbase_table)
def mapper(self, _, raw_cdx):
self.increment_counter('lines', 'total')
if (raw_cdx.startswith(' ') or raw_cdx.startswith('filedesc') or
raw_cdx.startswith('#')):
# Skip line
# XXX: tests don't cover this path; need coverage!
self.increment_counter('lines', 'invalid')
return _, dict(status="invalid")
info = transform_line(raw_cdx)
if info is None:
self.increment_counter('lines', 'invalid')
return _, dict(status="invalid")
if info['file:mime'] not in self.mime_filter:
self.increment_counter('lines', 'skip')
return _, dict(status="skip")
key = info.pop('key')
info['f:c'] = json.dumps(info['f:c'], sort_keys=True, indent=None)
info['file:cdx'] = json.dumps(info['file:cdx'], sort_keys=True,
indent=None)
self.hb_table.put(key, info)
self.increment_counter('lines', 'success')
yield _, dict(status="success")
if __name__ == '__main__':
MRCDXBackfillHBase.run()
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