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#!/usr/bin/python3
import sys, os, re
import bz2
import sqlite3
import argparse
parser = argparse.ArgumentParser(description="""
Adds data from the wiki dump index-file into a database
""", formatter_class=argparse.RawDescriptionHelpFormatter)
parser.parse_args()
indexFile = 'enwiki-20220501-pages-articles-multistream-index.txt.bz2' # Had about 22e6 lines
indexDb = 'dumpIndex.db'
if os.path.exists(indexDb):
raise Exception(f'ERROR: Existing {indexDb}')
print('Creating database')
dbCon = sqlite3.connect(indexDb)
dbCur = dbCon.cursor()
dbCur.execute('CREATE TABLE offsets (title TEXT PRIMARY KEY, id INT UNIQUE, offset INT, next_offset INT)')
print('Iterating through index file')
lineRegex = re.compile(r'([^:]+):([^:]+):(.*)')
lastOffset = 0
lineNum = 0
entriesToAdd: list[tuple[str, str]] = []
with bz2.open(indexFile, mode='rt') as file:
for line in file:
lineNum += 1
if lineNum % 1e5 == 0:
print(f'At line {lineNum}')
#
match = lineRegex.fullmatch(line.rstrip())
assert match is not None
offsetStr, pageId, title = match.group(1,2,3)
offset = int(offsetStr)
if offset > lastOffset:
for t, p in entriesToAdd:
try:
dbCur.execute('INSERT INTO offsets VALUES (?, ?, ?, ?)', (t, int(p), lastOffset, offset))
except sqlite3.IntegrityError as e:
# Accounts for certain entries in the file that have the same title
print(f'Failed on title "{t}": {e}', file=sys.stderr)
entriesToAdd = []
lastOffset = offset
entriesToAdd.append((title, pageId))
for title, pageId in entriesToAdd:
try:
dbCur.execute('INSERT INTO offsets VALUES (?, ?, ?, ?)', (title, int(pageId), lastOffset, -1))
except sqlite3.IntegrityError as e:
print(f'Failed on title "{t}": {e}', file=sys.stderr)
print('Closing database')
dbCon.commit()
dbCon.close()
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