searxng/searx/engines/sqlite.py
Alexandre Flament 2ea34a3c36 [enh] add offline engine for sqlite database
To test & demonstrate this implementation download:

  https://liste.mediathekview.de/filmliste-v2.db.bz2

and unpack into searx/data/filmliste-v2.db, in your settings.yml define a sqlite
engine named "demo"::

    - name : demo
      engine : sqlite
      shortcut: demo
      categories: general
      result_template: default.html
      database : searx/data/filmliste-v2.db
      query_str :  >-
        SELECT title || ' (' || time(duration, 'unixepoch') || ')' AS title,
               COALESCE( NULLIF(url_video_hd,''), NULLIF(url_video_sd,''), url_video) AS url,
               description AS content
          FROM film
         WHERE title LIKE :wildcard OR description LIKE :wildcard
         ORDER BY duration DESC
      disabled : False

Query to test: "!demo concert"

This is a rewrite of the implementation from commit [1]

[1] searx/searx@8e90a21

Suggested-by: @virtadpt searx/searx#2808
2021-05-27 14:27:11 +02:00

76 lines
2.0 KiB
Python

# SPDX-License-Identifier: AGPL-3.0-or-later
# lint: pylint
# pylint: disable=missing-function-docstring
"""SQLite database (Offline)
"""
import sqlite3
import contextlib
from searx import logger
logger = logger.getChild('SQLite engine')
engine_type = 'offline'
database = ""
query_str = ""
limit = 10
paging = True
result_template = 'key-value.html'
def init(engine_settings):
if 'query_str' not in engine_settings:
raise ValueError('query_str cannot be empty')
if not engine_settings['query_str'].lower().startswith('select '):
raise ValueError('only SELECT query is supported')
@contextlib.contextmanager
def sqlite_cursor():
"""Implements a `Context Manager`_ for a :py:obj:`sqlite3.Cursor`.
Open database in read only mode: if the database doesn't exist.
The default mode creates an empty file on the file system.
see:
* https://docs.python.org/3/library/sqlite3.html#sqlite3.connect
* https://www.sqlite.org/uri.html
"""
global database # pylint: disable=global-statement
uri = 'file:' + database + '?mode=ro'
with contextlib.closing(sqlite3.connect(uri, uri=True)) as connect:
connect.row_factory = sqlite3.Row
with contextlib.closing(connect.cursor()) as cursor:
yield cursor
def search(query, params):
global query_str, result_template # pylint: disable=global-statement
results = []
query_params = {
'query': query,
'wildcard': r'%' + query.replace(' ', r'%') + r'%',
'limit': limit,
'offset': (params['pageno'] - 1) * limit
}
query_to_run = query_str + ' LIMIT :limit OFFSET :offset'
with sqlite_cursor() as cur:
cur.execute(query_to_run, query_params)
col_names = [cn[0] for cn in cur.description]
for row in cur.fetchall():
item = dict( zip(col_names, map(str, row)) )
item['template'] = result_template
logger.debug("append result --> %s", item)
results.append(item)
return results