Convert plugin searx.plugin.limiter to normal code

The limiter plugin is not a plugin:
* the user can't enable or disable the plugin and there is no point to allow that
* the limiter does use any of the features provides by the plugin framework

This commit convert the limiter plugin into normal code

searx/botdetection/__init__.py

@@ -42,3 +42,6 @@ X-Forwarded-For
 from ._helpers import dump_request
 from ._helpers import get_real_ip
 from ._helpers import too_many_requests
+from .install import initialize, is_installed
+
+__all__ = ['dump_request', 'get_real_ip', 'too_many_requests', 'initialize', 'is_installed']

searx/botdetection/install.py

@@ -6,26 +6,31 @@
 import sys
 import flask
 
-from searx import redisdb
-from searx.plugins import logger
+from searx import redisdb, logger
 from searx.botdetection import limiter
 
-name = "Request limiter"
-description = "Limit the number of request"
-default_on = False
-preference_section = 'service'
-
+# the configuration are limiter.toml and "limiter" in settings.yml
+# so, for coherency, the logger is "limiter" even if the module name "searx.botdetection"
 logger = logger.getChild('limiter')
 
 
+_INSTALLED = False
+
+
 def pre_request():
     """See :ref:`flask.Flask.before_request`"""
     return limiter.filter_request(flask.request)
 
 
-def init(app: flask.Flask, settings) -> bool:
+def is_installed():
+    return _INSTALLED
+
+
+def initialize(app: flask.Flask, settings):
+    """Instal the botlimiter aka limiter"""
+    global _INSTALLED  # pylint: disable=global-statement
     if not settings['server']['limiter'] and not settings['server']['public_instance']:
-        return False
+        return
     if not redisdb.client():
         logger.error(
             "The limiter requires Redis, please consult the documentation: "
@@ -33,6 +38,6 @@ def init(app: flask.Flask, settings) -> bool:
         )
         if settings['server']['public_instance']:
             sys.exit(1)
-        return False
+        return
     app.before_request(pre_request)
-    return True
+    _INSTALLED = True

searx/webapp.py

@@ -94,7 +94,11 @@ from searx.utils import (
 from searx.version import VERSION_STRING, GIT_URL, GIT_BRANCH
 from searx.query import RawTextQuery
 from searx.plugins import Plugin, plugins, initialize as plugin_initialize
-from searx.botdetection import link_token
+from searx.botdetection import (
+    link_token,
+    initialize as botdetection_initialize,
+    is_installed as botdetection_is_installed,
+)
 from searx.plugins.oa_doi_rewrite import get_doi_resolver
 from searx.preferences import (
     Preferences,
@@ -1288,7 +1292,7 @@ def config():
                 'DOCS_URL': get_setting('brand.docs_url'),
             },
             'limiter': {
-                'enabled': settings['server']['limiter'],
+                'enabled': botdetection_is_installed(),
                 'botdetection.ip_limit.link_token': _limiter_cfg.get('botdetection.ip_limit.link_token'),
                 'botdetection.ip_lists.pass_searxng_org': _limiter_cfg.get('botdetection.ip_lists.pass_searxng_org'),
             },
@@ -1322,6 +1326,7 @@ if not werkzeug_reloader or (werkzeug_reloader and os.environ.get("WERKZEUG_RUN_
     redis_initialize()
     plugin_initialize(app)
     search_initialize(enable_checker=True, check_network=True, enable_metrics=settings['general']['enable_metrics'])
+    botdetection_initialize(app, settings)
 
 
 def run():