[mod] isolation of botdetection from SearXNG core

In PR-2894[1] we isolated botdetection from the limiter, this PR isolates the
botdetection from the SearXNG core code.

This PR also fixes the issue [2] that the ``server.public_instance`` option
needs to activate the limiter.

- [1] https://github.com/searxng/searxng/pull/2894
- [2] https://github.com/searxng/searxng/issues/2975

Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>

tests/unit/test_plugins.py

@@ -3,7 +3,6 @@
 from searx import (
     plugins,
     limiter,
-    botdetection,
 )
 
 from mock import Mock
@@ -51,8 +50,10 @@ class SelfIPTest(SearxTestCase):
         plugin = plugins.load_and_initialize_plugin('searx.plugins.self_info', False, (None, {}))
         store = plugins.PluginStore()
         store.register(plugin)
-        cfg = limiter.get_cfg()
-        botdetection.init(cfg, None)
+
+        from searx import webapp  # pylint disable=import-outside-toplevel
+
+        limiter.initialize(webapp.app, webapp.settings)
 
         self.assertTrue(len(store.plugins) == 1)
 

tests/unit/test_webapp.py

@@ -6,6 +6,7 @@ from mock import Mock
 from searx.results import Timing
 
 import searx.search.processors
+from searx import limiter
 from searx.search import Search
 from searx.preferences import Preferences
 from tests import SearxTestCase
@@ -21,6 +22,8 @@ class ViewsTestCase(SearxTestCase):
 
         from searx import webapp  # pylint disable=import-outside-toplevel
 
+        limiter.initialize(webapp.app, webapp.settings)
+
         webapp.app.config['TESTING'] = True  # to get better error messages
         self.app = webapp.app.test_client()