Merge pull request #686 from return42/lib_redis

Add redis DB and connector

searx/settings.yml

@@ -62,6 +62,10 @@ server:
     X-Robots-Tag: noindex, nofollow
     Referrer-Policy: no-referrer
 
+redis:
+  # https://redis-py.readthedocs.io/en/stable/connections.html#redis.client.Redis.from_url
+  url: unix:///usr/local/searxng-redis/run/redis.sock?db=0
+
 ui:
   # Custom static path - leave it blank if you didn't change
   static_path: ""

searx/settings_defaults.py

@@ -170,6 +170,9 @@ SCHEMA = {
         'method': SettingsValue(('POST', 'GET'), 'POST'),
         'default_http_headers': SettingsValue(dict, {}),
     },
+    'redis': {
+        'url': SettingsValue(str, 'unix:///usr/local/searxng-redis/run/redis.sock?db=0'),
+    },
     'ui': {
         'static_path': SettingsDirectoryValue(str, os.path.join(searx_dir, 'static')),
         'templates_path': SettingsDirectoryValue(str, os.path.join(searx_dir, 'templates')),

searx/shared/redisdb.py

@@ -0,0 +1,47 @@
+# SPDX-License-Identifier: AGPL-3.0-or-later
+# lint: pylint
+"""Implementation of the redis client (redis-py_).
+
+.. _redis-py: https://github.com/redis/redis-py
+
+This implementation uses the :ref:`settings redis` setup from ``settings.yml``.
+A redis DB connect can be tested by::
+
+  >>> from searx.shared import redisdb
+  >>> redisdb.init()
+  True
+  >>> db = redisdb.client()
+  >>> db.set("foo", "bar")
+  True
+  >>> db.get("foo")
+  b'bar'
+  >>>
+
+"""
+
+import logging
+import redis
+from searx import get_setting
+
+logger = logging.getLogger('searx.shared.redis')
+_client = None
+
+
+def client():
+    global _client  # pylint: disable=global-statement
+    if _client is None:
+        # not thread safe: in the worst case scenario, two or more clients are
+        # initialized only one is kept, the others are garbage collected.
+        _client = redis.Redis.from_url(get_setting('redis.url'))
+    return _client
+
+
+def init():
+    try:
+        c = client()
+        logger.info("connected redis DB --> %s", c.acl_whoami())
+        return True
+    except redis.exceptions.ConnectionError as exc:
+        logger.error("can't connet redis DB ...")
+        logger.error("  %s", exc)
+    return False