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# -*- coding: utf-8 -*-
"""
fetch.py
~~~~~~~~
This module implements a Python class responsible to fetch and update
the package database and the auxiliary files.
Used only by the live version of g-octave.
:copyright: (c) 2009-2010 by Rafael Goncalves Martins
:license: GPL-2, see LICENSE for more details.
"""
from __future__ import absolute_import
__all__ = [
'need_update',
'check_updates',
'download_files',
'check_db_cache',
]
from .config import Config
conf = Config(True) # fetch phase
from .exception import FetchException
from .compat import py3k
if py3k:
import urllib.request as urllib
else:
import urllib2 as urllib
import os
import json
import re
import tarfile
import portage.output
out = portage.output.EOutput()
re_files = {
'info.json': re.compile(r'info-([0-9]{10})-([0-9]+)\.json'),
'octave-forge.db.tar.gz': re.compile(r'octave-forge-([0-9]{10})\.db\.tar\.gz'),
'patches.tar.gz': re.compile(r'patches-([0-9]{10})-([0-9]+)\.tar\.gz'),
}
def need_update():
return not os.path.exists(os.path.join(conf.db, 'update.json'))
def check_updates():
try:
update = download_with_urllib2(conf.db_mirror + '/update.json', display_info=False)
except Exception as error:
# if we already have a file, that's ok
if need_update():
raise FetchException(error)
with open(os.path.join(conf.db, 'update.json')) as fp:
update = fp.read()
else:
with open(os.path.join(conf.db, 'update.json'), 'w') as fp:
fp.write(update)
updated_files = json.loads(update)
old_files = []
for _file in updated_files['files']:
if not os.path.exists(os.path.join(conf.db, _file)):
old_files.append(_file)
return old_files
def download_files(files):
for _file in files:
download_with_urllib2(conf.db_mirror + '/' + _file, conf.db)
add_file_to_db_cache(_file)
extract(_file)
def download_with_urllib2(url, dest=None, display_info=True):
my_file = os.path.basename(url)
if display_info:
out.ebegin('Downloading: %s' % my_file)
try:
fp = urllib.urlopen(url)
file_content = fp.read()
fp.close()
if dest != None:
if not os.path.exists(dest):
os.makedirs(dest, 0o755)
with open(os.path.join(dest, my_file), 'w') as fp:
fp.write(file_content)
else:
if display_info:
out.eend(0)
return file_content
except Exception as error:
if display_info:
out.eend(1)
raise Exception('Failed to fetch the file (%s): %s' % (my_file, error))
else:
if display_info:
out.eend(0)
def add_file_to_db_cache(_file):
my_file = os.path.join(conf.db, 'cache.json')
try:
with open(my_file) as fp:
files = json.load(fp)
except:
files = {'files': {}}
for f in re_files:
if re_files[f].match(_file) != None:
files['files'][f] = _file
with open(my_file, 'w') as fp:
json.dump(files, fp)
def check_db_cache():
try:
with open(os.path.join(conf.db, 'cache.json')) as fp:
cache = json.load(fp)
except:
cache = {'files': {}}
try:
with open(os.path.join(conf.db, 'update.json')) as fp:
update = json.load(fp)
except:
my_cache = os.listdir(conf.db)
update = {'files': []}
for f in my_cache:
for s in ['patches-', 'info-', 'octave-forge-']:
if f.startswith(s) and f not in update['files']:
update['files'].append(f)
for _file in update['files']:
if _file not in list(cache['files'].values()):
my_file = os.path.join(conf.db, _file)
if not os.path.exists(my_file):
download_with_wget(conf.db_mirror + '/' + _file, my_file)
add_file_to_db_cache(_file)
extract(_file)
def extract(gz_file, display_info=True):
my_file = os.path.join(conf.db, gz_file)
if tarfile.is_tarfile(my_file):
if display_info:
out.ebegin('Extracting: %s' % os.path.basename(gz_file))
try:
fp = tarfile.open(my_file, 'r:gz')
fp.extractall(conf.db)
except Exception as error:
if display_info:
out.eend(1)
raise Exception('Failed to extract the file (%s): %s' % (my_file, error))
else:
if display_info:
out.eend(0)
|
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