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elasticsearch_parser.py
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Thu, Dec 19, 15:01

elasticsearch_parser.py
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# -*- coding: utf-8 -*-
##
## This file is part of Invenio.
## Copyright (C) 2014 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.
"""JsonAchemy parser for elasticsearch Invenio extension."""
from pyparsing import Keyword, Suppress, Word, Optional, Each, \
OneOrMore, alphanums, restOfLine
from invenio.base.utils import try_to_eval
from invenio.modules.jsonalchemy.parser import FieldBaseExtensionParser, \
indentedBlock, DICT_DEF
from invenio.modules.jsonalchemy.registry import functions
class ElasticSearchParser(FieldBaseExtensionParser):
"""ElasticSearch jsonalchemy extension."""
__parsername__ = 'elasticsearch'
@classmethod
def parse_element(cls, indent_stack):
"""Parse ``elasticsearch`` section.
This is an example of the content of this section::
@extend
title:
elasticsearch:
mapping: {
"properties": {
"title": {
"index_name": "title",
"type": "multi_field",
"fields": {
"title": {
"type": "string",
"analyzer": "standard"
},
"sort_title": {
"type": "string",
"analyzer": "simple"
}
}
}
}
}
local_tokenizer:
title.title, invenio.ext.elasticsearch.token1
title.subtitle, invenio.ext.elasticsearch.token2
facets: {
"authors": {
"terms" : {
"field" : "facet_authors",
"size": 10,
"order" : { "_count" : "desc" }
}
}
}
highlights: {
"number_of_fragments" : 3,
"fragment_size" : 70
}
"""
mapping = (Keyword('mapping:').suppress() + DICT_DEF)\
.setResultsName('mapping')\
.setParseAction(lambda toks: toks[0])
tokenizer_field = Word(alphanums + '_' + '.')
local_tokenizer = (Keyword('local_tokenizer:').suppress() +
indentedBlock(
OneOrMore(tokenizer_field +
Suppress(',') +
restOfLine), indent_stack)
).setResultsName('local_tokenizer')
facets = (Keyword('facets:').suppress() + DICT_DEF)\
.setResultsName('facets')\
.setParseAction(lambda toks: toks[0])
highlights = (Keyword('highlights:').suppress() + DICT_DEF)\
.setResultsName('highlights')\
.setParseAction(lambda toks: toks[0])
return (Keyword('elasticsearch:').suppress() +
indentedBlock(
Each([Optional(mapping),
Optional(local_tokenizer),
Optional(facets),
Optional(highlights)]),
indent_stack)
).setResultsName('elasticsearch')
@classmethod
def create_element(cls, rule, namespace):
"""Create the dictionary with the info from the configuratin file."""
element = dict()
element['mapping'] = try_to_eval(
rule.mapping, functions(namespace)) if rule.mapping else {}
element['facets'] = try_to_eval(
rule.facets, functions(namespace)) if rule.facets else {}
element['highlights'] = try_to_eval(
rule.highlights, functions(namespace)) if rule.highlights else {}
element['local_tokenizer'] = []
if rule.local_tokenizer:
for i in range(0, len(rule.local_tokenizer), 2):
element['local_tokenizer'].append(
(rule.local_tokenizer[i], rule.local_tokenizer[i + 1]))
return element
parser = ElasticSearchParser

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