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solrutils_bibindex_searcher.py
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Thu, Aug 29, 13:59

solrutils_bibindex_searcher.py
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# -*- coding: utf-8 -*-
##
## This file is part of Invenio.
## Copyright (C) 2011 CERN.
##
## Invenio 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 2 of the
## License, or (at your option) any later version.
##
## Invenio 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 Invenio; if not, write to the Free Software Foundation, Inc.,
## 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
"""
Solr utilities.
"""
import urllib2
import urllib
import mimetools
from invenio import intbitset
from invenio.urlutils import make_invenio_opener
from invenio.jsonutils import json
from invenio.config import CFG_SOLR_URL, \
CFG_WEBSEARCH_FULLTEXT_SNIPPETS, \
CFG_WEBSEARCH_FULLTEXT_SNIPPETS_CHARS
if CFG_SOLR_URL:
import solr
SOLR_CONNECTION = solr.SolrConnection(CFG_SOLR_URL) # pylint: disable=E1101
SOLRUTILS_OPENER = make_invenio_opener('solrutils')
def solr_get_facets(bitset, solr_url):
facet_query_url = "%s/invenio_facets" % solr_url
# now use the bitset to fetch the facet data
r = urllib2.Request(facet_query_url)
data = bitset.fastdump()
boundary = mimetools.choose_boundary()
# fool solr into thinking we're uploading a file so it will read our data as a stream
contents = '--%s\r\n' % boundary
contents += 'Content-Disposition: form-data; name="bitset"; filename="bitset"\r\n'
contents += 'Content-Type: application/octet-stream\r\n'
contents += '\r\n' + data + '\r\n'
contents += '--%s--\r\n\r\n' % boundary
r.add_data(contents)
contenttype = 'multipart/form-data; boundary=%s' % boundary
r.add_unredirected_header('Content-Type', contenttype)
# post the request and get back the facets as json
u = SOLRUTILS_OPENER.open(r)
return json.load(u)
def solr_get_bitset(index, query):
"""
Queries an index and returns the ids as intbitset. Expects the Solr extension classes to be enabled
to retrieve and intbitset result directly.
"""
invenio_query_url = "%s/select?qt=invenio_query&q=%s:%s" % (CFG_SOLR_URL, index, urllib.quote(query))
# query to get a bitset
bitset = intbitset.intbitset()
u = SOLRUTILS_OPENER.open(invenio_query_url)
data = u.read()
bitset.fastload(data)
return bitset
def solr_get_snippet(keywords, recid, nb_chars, max_snippets, field='fulltext',
prefix_tag='<strong>', suffix_tag='</strong>'):
query_parts = []
for keyword in keywords:
# Treads phrases properly
if ' ' in keyword:
query_parts.append('"%s"' % keyword)
else:
query_parts.append(keyword)
res = SOLR_CONNECTION.query(q=' '.join(query_parts), fq='id:(%s)' % recid, fields=['fulltext'],
highlight=True, hl_fragsize=nb_chars, hl_snippets=max_snippets,
# backward-compatible to simple highlighter
hl_simple_pre=prefix_tag, hl_simple_post=suffix_tag,
# faster highlighter
hl_tag_pre=prefix_tag, hl_tag_post=suffix_tag,
hl_mergeContiguous='true',
hl_useFastVectorHighlighter='true')
out = ''
try:
for snippet in res.highlighting[str(recid)][field]:
if out:
out += " ... "
out += snippet
except KeyError:
pass
return out.replace('\n', ' ').encode('utf-8')

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