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import argparse
import sys
import urllib.request
import dump2msgp
import msgPack2sqlite_msgPack
import subprocess
from os.path import exists
URL_DUMP = "https://dumps.wikimedia.org/frwiktionary/latest/frwiktionary-latest-pages-meta-current.xml.bz2"
def unbz2(file):
decomp = bz2.BZ2Decompressor()
buf = b''
for c in file:
buf += decomp.decompress(c)
while b'\n' in buf:
i = buf.index(b'\n')
if i + 1 < len(buf):
ret = buf[:i + 1]
buf = buf[i + 1:]
yield ret.decode("utf-8")
else:
yield buf.decode("utf-8")
buf = b''
if __name__ == '__main__':
parser = argparse.ArgumentParser(description='Download and create the database')
parser.add_argument('-o', '--out', dest='outputF', action='store',
help='the output, the database file',
default='dicofr.db')
parser.add_argument('-i', '--in', dest='dumpF', action='store',
help='the input dump file\'s filename',
default='')
parser.add_argument('-d', '--download', dest='download', action='store_true',
help='to download the lastest dump')
arg = parser.parse_args()
download = True
if download and arg.dumpF:
print("Incompatible options '-i' and '-d'.")
exit(1)
elif download:
arg.dumpF = URL_DUMP[URL_DUMP.rindex('/') + 1:]
if not arg.dumpF or not arg.dumpF.endswith('bz2'):
print('A bz2 dump file filename needed', file=sys.stderr)
exit(-1)
if exists(arg.dumpF) and download:
print(f"{arg.dumpF} exists. Force downloading ? (y/N)")
answer = input('> ')
if answer.lower()[0] != 'y':
download = False
if download:
print(f"Downloading the dump ({arg.dumpF})\nIt should take some time")
urllib.request.urlretrieve(URL_DUMP, arg.dumpF)
if not exists(arg.dumpF):
print('Download failed.\nExiting.', file=sys.stderr)
exit(-2)
decompress = False
try:
print("Trying the bzip2 command")
assert(subprocess.call(['bzip2', '-d', arg.dumpF]) == 0)
decompress = True
except:
print("The command “bzip” doesn't exists, or doesn't work as intended")
print("Fallback to Python bz2 module decompressor")
# Decompression using bzip2
if not decompress:
try:
import bz2
with open(arg.dumpF, 'rb') as f:
it = iter(lambda: f.read(2**16), b'')
output_fn = arg.dumpF[:-4]
with open(output_fn, 'wb') as fout:
dcomp = bz2.BZ2Decompressor()
for chunk in it:
datal = len(chunk)
data = dcomp.decompress(chunk)
fout.write(data)
decompress = True
except:
print("Python bz2 module decompressor failed, maybe you don't have any space available")
print("Fallback to on the fly decompressor (RAM will be needed)")
if not decompress:
try:
# On the fly Decompression
with open(arg.dumpF, 'rb') as f:
it = iter(lambda: f.read(2**16), b'')
print("Data extraction on the fly")
res = dump2msgp.extractAll(unbz2(it), "error.log", False)
msgPack2sqlite_msgPack.writeDB(arg.outputF, res)
print(f"Database { arg.outputF } created ! 👏 🎉")
except:
print("Error: Can't extract the dump file")
print("Exiting (-1)")
exit(-1)
print(f"Removing temporary files")
os.remove(arg.dumpF)
else:
try:
output_fn = arg.dumpF[:-4]
with open(output_fn, 'r') as f:
print("Create the database")
res = dump2msgp.extractAll(f, "error.log", False)
msgPack2sqlite_msgPack.writeDB(arg.outputF, res)
print(f"Database { arg.outputF } created ! 👏 🎉")
except:
print("Failed to extract database")
print(("Exiting (-3)")
exit(-3)
print(f"Removing temporary files")
os.remove(output_fn)
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