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#!/usr/bin/python3
import sys, os, re
import bz2
import sqlite3
usageInfo = f"usage: {sys.argv[0]}\n"
usageInfo += "Reads a Wikimedia enwiki dump index file,\n"
usageInfo += "and stores it's offset and title data to an sqlite db.\n"
if len(sys.argv) > 1:
print(usageInfo, file=sys.stderr)
sys.exit(1)
indexFile = "enwiki-20220501-pages-articles-multistream-index.txt.bz2" # 22,034,540 lines
indexDb = "dumpIndex.db"
# Check for existing db
if os.path.exists(indexDb):
print(f"ERROR: Existing {indexDb}", file=sys.stderr)
sys.exit(1)
# Create db
dbCon = sqlite3.connect(indexDb)
dbCur = dbCon.cursor()
dbCur.execute("CREATE TABLE offsets (title TEXT PRIMARY KEY, id INT UNIQUE, offset INT, next_offset INT)")
# Reading index file
lineRegex = re.compile(r"([^:]+):([^:]+):(.*)")
lastOffset = 0
lineNum = 0
entriesToAdd = []
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())
(offset, pageId, title) = match.group(1,2,3)
offset = int(offset)
if offset > lastOffset:
for (t, p) in entriesToAdd:
try:
dbCur.execute("INSERT INTO offsets VALUES (?, ?, ?, ?)", (t, 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}")
entriesToAdd = []
lastOffset = offset
entriesToAdd.append([title, pageId])
for (title, pageId) in entriesToAdd:
try:
dbCur.execute("INSERT INTO offsets VALUES (?, ?, ?, ?)", (title, pageId, lastOffset, -1))
except sqlite3.IntegrityError as e:
print(f"Failed on title \"{t}\": {e}")
# Close db
dbCon.commit()
dbCon.close()
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