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#! /usr/bin/env python
#-*- coding: utf-8 -*-
# pyAggr3g470r - A Web based news aggregator.
# Copyright (C) 2010-2014 Cédric Bonhomme - https://www.cedricbonhomme.org
#
# For more information : https://bitbucket.org/cedricbonhomme/pyaggr3g470r/
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero 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 Affero General Public License for more details.
#
# You should have received a copy of the GNU Affero General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
__author__ = "Cedric Bonhomme"
__version__ = "$Revision: 0.3 $"
__date__ = "$Date: 2013/06/24 $"
__revision__ = "$Date: 2013/11/10 $"
__copyright__ = "Copyright (c) Cedric Bonhomme"
__license__ = "AGPLv3"
import os
import logging
from whoosh.index import create_in, open_dir
from whoosh.index import EmptyIndexError
from whoosh.fields import *
from whoosh.query import *
from whoosh.qparser import QueryParser
from whoosh.writing import AsyncWriter
from collections import defaultdict
from pyaggr3g470r.models import User
from pyaggr3g470r.decorators import async
from pyaggr3g470r import utils
logger = logging.getLogger(__name__)
indexdir = "./pyaggr3g470r/var/indexdir"
schema = Schema(title=TEXT,
content=TEXT,
article_id=NUMERIC(int, stored=True),
feed_id=NUMERIC(int, stored=True),
user_id=NUMERIC(int, stored=True))
@async
def create_index(user_id):
"""
Creates the index.
"""
user = User.query.filter(User.id == user_id).first()
logger.info("Starting indexation of the database.")
if not os.path.exists(indexdir):
os.makedirs(indexdir)
ix = create_in(indexdir, schema)
writer = ix.writer()
for feed in user.feeds:
logger.info("Indexing " + feed.title)
for article in feed.articles:
writer.add_document(title=article.title,
content=utils.clear_string(article.content),
article_id=article.id,
feed_id=feed.id,
user_id=user.id)
writer.commit()
logger.info("Indexation done.")
def add_to_index(user_id, articles, feed):
"""
Add a list of articles to the index.
Here an AsyncWriter is used because the function will
be called in multiple threads by the feedgetter module.
"""
try:
ix = open_dir(indexdir)
except (EmptyIndexError, OSError):
if not os.path.exists(indexdir):
os.makedirs(indexdir)
ix = create_in(indexdir, schema)
writer = AsyncWriter(ix)
for article in articles:
writer.add_document(title=article.title,
content=utils.clear_string(article.content),
article_id=article.id,
feed_id=feed.id,
user_id=user_id)
writer.commit()
def delete_article(user_id, feed_id, article_id):
"""
Delete an article from the index.
"""
try:
ix = open_dir(indexdir)
except (EmptyIndexError, OSError):
raise EmptyIndexError
writer = ix.writer()
document = And([Term("user_id", user_id), Term("feed_id", feed_id),
Term("article_id", article_id)])
writer.delete_by_query(document)
writer.commit()
def search(user_id, term):
"""
Search for `term` in the index.
Returns a list of articles.
"""
result_dict = defaultdict(list)
try:
ix = open_dir(indexdir)
except (EmptyIndexError, OSError):
raise EmptyIndexError
with ix.searcher() as searcher:
query = QueryParser("content", ix.schema).parse(term)
user_doc = Term("user_id", user_id)
results = searcher.search(query, filter=user_doc, limit=None)
for article in results:
result_dict[article["feed_id"]].append(article["article_id"])
return result_dict, len(results)
def nb_documents():
"""
Return the number of undeleted documents.
"""
try:
ix = open_dir(indexdir)
except (EmptyIndexError, OSError):
raise EmptyIndexError
return ix.doc_count()
if __name__ == "__main__":
# Point of entry in execution mode.
#create_index()
print(nb_documents())
results = search("Nothomb")
for article in results:
print(article)
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