data.py
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#!/usr/bin/python
# AppRecommender - A GNU/Linux application recommender
#
# Copyright (C) 2010 Tassia Camoes <tassia@gmail.com>
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
import os
import sys
import re
import xapian
import axi
from debian import debtags
import logging
import hashlib
from error import Error
class Item:
""" """
class Package(Item):
""" """
def __init__(self,package_name):
""" """
self.package_name = package_name
def load_package_info(self):
""" """
print "debian pkg",self.id
def normalize_tags(string):
"""
Normalize tag string so that it can be indexed and retrieved.
"""
return string.replace(':','_').replace('-','\'')
class Singleton(object):
def __new__(cls, *args, **kwargs):
if '_inst' not in vars(cls):
cls._inst = object.__new__(cls)
return cls._inst
class TagsXapianIndex(xapian.WritableDatabase,Singleton):
def __init__(self,cfg):
self.path = os.path.expanduser(cfg.tags_index)
self.db_path = os.path.expanduser(cfg.tags_db)
self.debtags_db = debtags.DB()
db = open(self.db_path)
md5 = hashlib.md5()
md5.update(db.read())
self.db_md5 = md5.hexdigest()
self.load_index(cfg.reindex)
def load_db(self):
tag_filter = re.compile(r"^special::.+$|^.+::TODO$")
try:
db_file = open(self.db_path, "r")
self.debtags_db.read(db_file,lambda x: not tag_filter.match(x))
except IOError: #FIXME try is not catching this
logging.error("Could not load DebtagsDB from %s." % self.db_path)
raise Error
def relevant_tags_from_db(self,pkgs_list,qtd_of_tags):
"""
Return most relevant tags considering a list of packages.
"""
if not self.debtags_db.package_count():
self.load_db()
relevant_db = self.debtags_db.choose_packages(pkgs_list)
relevance_index = debtags.relevance_index_function(self.debtags_db,
relevant_db)
sorted_relevant_tags = sorted(relevant_db.iter_tags(),
lambda a, b: cmp(relevance_index(a),
relevance_index(b)))
return normalize_tags(' '.join(sorted_relevant_tags[-qtd_of_tags:]))
def load_index(self,reindex):
"""
Load an existing debtags index.
"""
if not reindex:
try:
logging.info("Opening existing debtags xapian index at \'%s\'"
% self.path)
xapian.Database.__init__(self,self.path)
md5 = self.get_metadata("md5")
if not md5 == self.db_md5:
logging.info("Index must be updated.")
reindex = 1
except xapian.DatabaseError:
logging.info("Could not open index.")
reindex =1
if reindex:
self.new_index()
def new_index(self):
"""
Create a xapian index for debtags info based on 'debtags_db' and
place it at 'index_path'.
"""
if not os.path.exists(self.path):
os.makedirs(self.path)
try:
logging.info("Creating new xapian index for debtags at \'%s\'" %
self.path)
xapian.WritableDatabase.__init__(self,self.path,
xapian.DB_CREATE_OR_OVERWRITE)
except xapian.DatabaseError:
logging.critical("Could not create xapian index.")
raise Error
self.load_db()
self.set_metadata("md5",self.db_md5)
for pkg,tags in self.debtags_db.iter_packages_tags():
doc = xapian.Document()
doc.set_data(pkg)
for tag in tags:
doc.add_term(normalize_tags(tag))
doc_id = self.add_document(doc)
logging.debug("Indexing doc %d",doc_id)