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#!/usr/bin/env python3
"""
This is a "one-time" tranform helper script for CDX backfill into sandcrawler
postgresql.
Most of this file was copied from '../python/common.py'.
"""
import json, os, sys, collections
import base64
import psycopg2
import psycopg2.extras
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") is 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") is None
assert normalize_mime("application/xml+stuff") == "text/xml"
assert normalize_mime("application/x-pdf") == "application/pdf"
assert normalize_mime("application/x-html") is None
def b32_hex(s):
s = s.strip().split()[0].lower()
if s.startswith("sha1:"):
s = s[5:]
if len(s) != 32:
return s
return base64.b16encode(base64.b32decode(s.upper())).lower().decode('utf-8')
def parse_cdx_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()
and mime != None):
return None
if '-' in (surt, dt, url, mime, http_status, key, c_size, offset, warc):
return None
# these are the new/specific bits
sha1 = b32_hex(key)
return dict(url=url, datetime=dt, sha1hex=sha1, cdx_sha1hex=None, mimetype=mime, warc_path=warc, warc_csize=int(c_size), warc_offset=int(offset))
def insert(cur, batch):
sql = """
INSERT INTO
cdx (url, datetime, sha1hex, mimetype, warc_path, warc_csize, warc_offset)
VALUES %s
ON CONFLICT ON CONSTRAINT cdx_pkey DO NOTHING
RETURNING 1;
"""
batch = [(d['url'], d['datetime'], d['sha1hex'], d['mimetype'],
d['warc_path'], d['warc_csize'], d['warc_offset'])
for d in batch]
res = psycopg2.extras.execute_values(cur, sql, batch) # fetch=True
#return len(res)
def stdin_to_pg():
# no host means it will use local domain socket by default
conn = psycopg2.connect(database="sandcrawler", user="postgres")
cur = conn.cursor()
counts = collections.Counter({'total': 0})
batch = []
for l in sys.stdin:
l = l.strip()
if counts['raw_lines'] > 0 and counts['raw_lines'] % 10000 == 0:
print("Progress: {}...".format(counts))
counts['raw_lines'] += 1
if not l:
continue
info = parse_cdx_line(l)
if not info:
continue
# XXX: filter to, eg, PDF or octet/stream (derp)
batch.append(info)
counts['total'] += 1
if len(batch) >= 1000:
insert(cur, batch)
conn.commit()
#counts['inserted'] += i
#counts['existing'] += len(batch) - i
batch = []
counts['batches'] += 1
if batch:
insert(cur, batch)
#counts['inserted'] += i
#counts['existing'] += len(batch) - i
batch = []
conn.commit()
cur.close()
print("Done: {}".format(counts))
if __name__=='__main__':
stdin_to_pg()
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