/usr/lib/python2.7/dist-packages/xapers/database.py is in xapers 0.7.1-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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This file is part of xapers.
Xapers 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.
Xapers 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 xapers. If not, see <http://www.gnu.org/licenses/>.
Copyright 2012-2017
Jameson Rollins <jrollins@finestructure.net>
"""
import os
import sys
import xapian
from .source import Sources
from .documents import Documents, Document
# FIXME: add db schema documentation
##################################################
class DatabaseError(Exception):
"""Base class for Xapers database exceptions."""
def __init__(self, msg):
self.msg = msg
def __str__(self):
return self.msg
class DatabaseUninitializedError(DatabaseError):
pass
class DatabaseInitializationError(DatabaseError):
pass
class DatabaseLockError(DatabaseError):
pass
##################################################
class Database():
"""Represents a Xapers database"""
# http://xapian.org/docs/omega/termprefixes.html
BOOLEAN_PREFIX = {
'id': 'Q',
'key': 'XBIB|',
'source': 'XSOURCE|',
'year': 'Y',
'y': 'Y',
}
# boolean prefixes for which there can be multiple per doc
BOOLEAN_PREFIX_MULTI = {
'tag': 'K',
}
# purely internal prefixes
BOOLEAN_PREFIX_INTERNAL = {
# FIXME: use this for doi?
#'url': 'U',
'file': 'P',
# FIXME: use this for doc mime type
'type': 'T',
}
PROBABILISTIC_PREFIX = {
'title': 'S',
't': 'S',
'author': 'A',
'a': 'A',
}
# http://xapian.org/docs/facets
NUMBER_VALUE_FACET = {
'year': 0,
'y': 0,
}
# FIXME: need to set the following value fields:
# publication date
# added date
# modified date
# FIXME: need database version
def _find_prefix(self, name):
# FIXME: make this a dictionary union
if name in self.BOOLEAN_PREFIX:
return self.BOOLEAN_PREFIX[name]
if name in self.BOOLEAN_PREFIX_MULTI:
return self.BOOLEAN_PREFIX_MULTI[name]
if name in self.BOOLEAN_PREFIX_INTERNAL:
return self.BOOLEAN_PREFIX_INTERNAL[name]
if name in self.PROBABILISTIC_PREFIX:
return self.PROBABILISTIC_PREFIX[name]
def _find_facet(self, name):
if name in self.NUMBER_VALUE_FACET:
return self.NUMBER_VALUE_FACET[name]
def _make_source_prefix(self, source):
return 'X%s|' % (source.upper())
########################################
def __init__(self, root, writable=False, create=False, force=False):
# xapers root
self.root = os.path.abspath(os.path.expanduser(root))
# xapers db directory
xapers_path = os.path.join(self.root, '.xapers')
# xapes directory initialization
if not os.path.exists(xapers_path):
if create:
if os.path.exists(self.root):
if os.listdir(self.root) and not force:
raise DatabaseInitializationError('Uninitialized Xapers root directory exists but is not empty.')
os.makedirs(xapers_path)
else:
if os.path.exists(self.root):
raise DatabaseInitializationError("Xapers directory '%s' does not contain a database." % (self.root))
else:
raise DatabaseUninitializedError("Xapers directory '%s' not found." % (self.root))
# the Xapian db
xapian_path = os.path.join(xapers_path, 'xapian')
if writable:
try:
self.xapian = xapian.WritableDatabase(xapian_path, xapian.DB_CREATE_OR_OPEN)
except xapian.DatabaseLockError:
raise DatabaseLockError("Xapers database locked.")
else:
self.xapian = xapian.Database(xapian_path)
stemmer = xapian.Stem("english")
# The Xapian TermGenerator
# http://trac.xapian.org/wiki/FAQ/TermGenerator
self.term_gen = xapian.TermGenerator()
self.term_gen.set_stemmer(stemmer)
# The Xapian QueryParser
self.query_parser = xapian.QueryParser()
self.query_parser.set_database(self.xapian)
self.query_parser.set_stemmer(stemmer)
self.query_parser.set_stemming_strategy(xapian.QueryParser.STEM_SOME)
self.query_parser.set_default_op(xapian.Query.OP_AND)
# add boolean internal prefixes
for name, prefix in self.BOOLEAN_PREFIX.iteritems():
self.query_parser.add_boolean_prefix(name, prefix)
# for prefixes that can be applied multiply to the same
# document (like tags) set the filter grouping to use AND:
# https://xapian.org/docs/apidoc/html/classXapian_1_1QueryParser.html#a67d25f9297bb98c2101a03ff3d60cf30
for name, prefix in self.BOOLEAN_PREFIX_MULTI.iteritems():
self.query_parser.add_boolean_prefix(name, prefix, False)
# add probabalistic prefixes
for name, prefix in self.PROBABILISTIC_PREFIX.iteritems():
self.query_parser.add_prefix(name, prefix)
# add value facets
for name, facet in self.NUMBER_VALUE_FACET.iteritems():
self.query_parser.add_valuerangeprocessor(
xapian.NumberValueRangeProcessor(facet, name+':')
)
# register known source prefixes
# FIXME: can we do this by just finding all XSOURCE terms in
# db? Would elliminate dependence on source modules at
# search time.
for source in Sources():
name = source.name
self.query_parser.add_boolean_prefix(name, self._make_source_prefix(name))
def __enter__(self):
return self
def __exit__(self, exc_type, exc_value, traceback):
self.xapian.close()
def reopen(self):
self.xapian.reopen()
def __contains__(self, docid):
try:
self.xapian.get_document(docid)
return True
except xapian.DocNotFoundError:
return False
def __getitem__(self, docid):
if type(docid) not in [int, long]:
raise TypeError("docid must be an int")
xapian_doc = self.xapian.get_document(docid)
return Document(self, xapian_doc)
########################################
# generate a new doc id, based on the last availabe doc id
def _generate_docid(self):
return self.xapian.get_lastdocid() + 1
########################################
# return a list of terms for prefix
def _term_iter(self, prefix=None):
term_iter = iter(self.xapian)
if prefix:
plen = len(prefix)
term = term_iter.skip_to(prefix)
if not term.term.startswith(prefix):
return
yield term.term[plen:]
for term in term_iter:
if prefix:
if not term.term.startswith(prefix):
break
yield term.term[plen:]
else:
yield term.term
def term_iter(self, name=None):
"""Generator of all terms in the database.
If a prefix is provided, will iterate over only the prefixed
terms, and the prefix will be removed from the returned terms.
"""
prefix = None
if name:
prefix = self._find_prefix(name)
if not prefix:
prefix = name
return self._term_iter(prefix)
def sid_iter(self):
"""Generator of all source ids in database"""
for source in self.term_iter('source'):
# FIXME: do this more efficiently
for oid in self._term_iter(self._make_source_prefix(source)):
yield '%s:%s' % (source, oid)
def get_sids(self):
"""Get all source ids in database as a list"""
return [sid for sid in self.sid_iter()]
def tag_iter(self):
"""Generator of all tags in database"""
for tag in self.term_iter('tag'):
yield tag
def get_tags(self):
"""Get all tags in database as a list"""
return [tag for tag in self.tag_iter()]
########################################
# search for documents based on query string and return mset
def _search(self, query_string, sort='relevance', limit=None):
enquire = xapian.Enquire(self.xapian)
# FIXME: add option for ascending/descending
if sort == 'relevance':
enquire.set_sort_by_relevance_then_value(self.NUMBER_VALUE_FACET['year'], True)
elif sort == 'year':
enquire.set_sort_by_value_then_relevance(self.NUMBER_VALUE_FACET['year'], True)
else:
raise ValueError("sort parameter accepts only 'relevance' or 'year'")
if query_string == "*":
query = xapian.Query.MatchAll
else:
# parse the query string to produce a Xapian::Query object.
query = self.query_parser.parse_query(query_string)
if os.getenv('XAPERS_DEBUG_QUERY'):
print >>sys.stderr, "query string:", query_string
print >>sys.stderr, "final query:", query
# FIXME: need to catch Xapian::Error when using enquire
enquire.set_query(query)
# set order of returned docs as newest first
# FIXME: make this user specifiable
enquire.set_docid_order(xapian.Enquire.DESCENDING)
if limit:
mset = enquire.get_mset(0, limit)
else:
mset = enquire.get_mset(0, self.xapian.get_doccount())
return mset
def search(self, query_string, sort='relevance', limit=None):
"""Search for documents in the database.
The `sort` keyword argument can be 'relevance' (default) or
'year'. `limit` can be used to limit the number of returned
documents (default is None).
"""
mset = self._search(query_string, sort=sort, limit=limit)
return Documents(self, mset)
def count(self, query_string):
"""Count documents matching search terms."""
return self._search(query_string).get_matches_estimated()
def _doc_for_term(self, term):
enquire = xapian.Enquire(self.xapian)
query = xapian.Query(term)
enquire.set_query(query)
mset = enquire.get_mset(0, 2)
# FIXME: need to throw an exception if more than one match found
if mset:
return Document(self, mset[0].document)
else:
return None
def doc_for_path(self, path):
"""Return document for specified path."""
term = self._find_prefix('file') + path
return self._doc_for_term(term)
def doc_for_source(self, sid):
"""Return document for source id string."""
source, oid = sid.split(':', 1)
term = self._make_source_prefix(source) + oid
return self._doc_for_term(term)
def doc_for_bib(self, bibkey):
"""Return document for bibtex key."""
term = self._find_prefix('key') + bibkey
return self._doc_for_term(term)
########################################
def replace_document(self, docid, doc):
"""Replace (sync) document to database."""
self.xapian.replace_document(docid, doc)
def delete_document(self, docid):
"""Delete document from database."""
self.xapian.delete_document(docid)
########################################
def restore(self, log=False):
"""Restore a database from an existing root."""
docdirs = os.listdir(self.root)
docdirs.sort()
for ddir in docdirs:
docdir = os.path.join(self.root, ddir)
# skip things that aren't directories
if not os.path.isdir(docdir):
continue
# if we can't convert the directory name into an integer,
# assume it's not relevant to us and continue
try:
docid = int(ddir)
except ValueError:
continue
if log:
print >>sys.stderr, docdir
docfiles = os.listdir(docdir)
if not docfiles:
# skip empty directories
continue
if log:
print >>sys.stderr, ' docid:', docid
try:
doc = self[docid]
except xapian.DocNotFoundError:
doc = Document(self, docid=docid)
for dfile in docfiles:
dpath = os.path.join(docdir, dfile)
if dfile == 'bibtex':
if log:
print >>sys.stderr, ' adding bibtex'
doc.add_bibtex(dpath)
elif dfile == 'tags':
if log:
print >>sys.stderr, ' adding tags'
with open(dpath, 'r') as f:
tags = f.read().strip().split('\n')
doc.add_tags(tags)
else: #elif os.path.splitext(dpath)[1] == '.pdf':
if log:
print >>sys.stderr, ' adding file:', dfile
doc.add_file(dpath)
doc.sync()
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