[mod] split searx.search into different processors

see searx.search.processors.abstract.EngineProcessor

First the method searx call the get_params method.

If the return value is not None, then the searx call the method search.

16 files changed, 476 insertions, 316 deletions

diff --git a/docs/admin/engines.rst b/docs/admin/engines.rst
index f1ac03699..0ec86a614 100644
--- a/docs/admin/engines.rst
+++ b/docs/admin/engines.rst
@@ -33,7 +33,7 @@ Engine        ..          Paging support       **P**
 ------------------------- -------------------- ------------
 Shortcut      **S**       Language support     **L**
 Timeout       **TO**      Time range support   **TR**
-Disabled      **D**       Offline              **O**
+Disabled      **D**       Engine type          **ET**
 ------------- ----------- -------------------- ------------
 Safe search   **SS**
 ------------- ----------- ---------------------------------
@@ -62,10 +62,10 @@ Show errors   **DE**
         - SS
         - D
         - TR
-        - O
-	- W
-	- D
-	- DE
+        - ET
+        - W
+        - D
+        - DE
 
       {% for name, mod in engines.items() %}
 
@@ -79,7 +79,7 @@ Show errors   **DE**
         - {{(mod.safesearch and "y") or ""}}
         - {{(mod.disabled and "y") or ""}}
         - {{(mod.time_range_support and "y") or ""}}
-        - {{(mod.offline and "y") or ""}}
+        - {{mod.engine_type or ""}}
         - {{mod.weight or 1 }}
         - {{(mod.disabled and "y") or ""}}
         - {{(mod.display_error_messages and "y") or ""}}
diff --git a/docs/dev/engine_overview.rst b/docs/dev/engine_overview.rst
index 3562ca61a..12e62eb61 100644
--- a/docs/dev/engine_overview.rst
+++ b/docs/dev/engine_overview.rst
@@ -44,7 +44,7 @@ categories              list        pages, in which the engine is working
 paging                  boolean     support multible pages
 language_support        boolean     support language choosing
 time_range_support      boolean     support search time range
-offline                 boolean     engine runs offline
+engine_type             str         ``online`` by default, ``offline``
 ======================= =========== ===========================================
 
 .. _engine settings:
diff --git a/searx/engines/__init__.py b/searx/engines/__init__.py
index b2a9b25a4..f2b7c5a84 100644
--- a/searx/engines/__init__.py
+++ b/searx/engines/__init__.py
@@ -53,7 +53,7 @@ engine_default_args = {'paging': False,
                        'suspend_end_time': 0,
                        'continuous_errors': 0,
                        'time_range_support': False,
-                       'offline': False,
+                       'engine_type': 'online',
                        'display_error_messages': True,
                        'tokens': []}
 
@@ -142,7 +142,9 @@ def load_engine(engine_data):
         'errors': 0
     }
 
-    if not engine.offline:
+    engine_type = getattr(engine, 'engine_type', 'online')
+
+    if engine_type != 'offline':
         engine.stats['page_load_time'] = 0
         engine.stats['page_load_count'] = 0
 
@@ -209,7 +211,7 @@ def get_engines_stats(preferences):
         else:
             score = score_per_result = 0.0
 
-        if not engine.offline:
+        if engine.engine_type != 'offline':
             load_times = 0
             if engine.stats['page_load_count'] != 0:
                 load_times = engine.stats['page_load_time'] / float(engine.stats['page_load_count'])  # noqa
@@ -300,7 +302,7 @@ def initialize_engines(engine_list):
 
 def _set_https_support_for_engine(engine):
     # check HTTPS support if it is not disabled
-    if not engine.offline and not hasattr(engine, 'https_support'):
+    if engine.engine_type != 'offline' and not hasattr(engine, 'https_support'):
         params = engine.request('http_test', {
             'method': 'GET',
             'headers': {},
diff --git a/searx/engines/command.py b/searx/engines/command.py
index 0268d52eb..6321e0004 100644
--- a/searx/engines/command.py
+++ b/searx/engines/command.py
@@ -23,7 +23,7 @@ from threading import Thread
 from searx import logger
 
 
-offline = True
+engine_type = 'offline'
 paging = True
 command = []
 delimiter = {}
diff --git a/searx/search/__init__.py b/searx/search/__init__.py
index 77835567e..4511463f3 100644
--- a/searx/search/__init__.py
+++ b/searx/search/__init__.py
@@ -20,21 +20,15 @@ import gc
 import threading
 from time import time
 from uuid import uuid4
-from urllib.parse import urlparse
 from _thread import start_new_thread
 
-import requests.exceptions
-import searx.poolrequests as requests_lib
-from searx.engines import engines, settings
+from searx import settings
 from searx.answerers import ask
 from searx.external_bang import get_bang_url
-from searx.utils import gen_useragent
 from searx.results import ResultContainer
 from searx import logger
 from searx.plugins import plugins
-from searx.exceptions import (SearxEngineAccessDeniedException, SearxEngineCaptchaException,
-                              SearxEngineTooManyRequestsException,)
-from searx.metrology.error_recorder import record_exception, record_error
+from searx.search.processors import processors, initialize as initialize_processors
 
 
 logger = logger.getChild('search')
@@ -51,6 +45,11 @@ else:
         sys.exit(1)
 
 
+def initialize(settings_engines=None):
+    settings_engines = settings_engines or settings['engines']
+    initialize_processors(settings_engines)
+
+
 class EngineRef:
 
     __slots__ = 'name', 'category', 'from_bang'
@@ -110,231 +109,6 @@ class SearchQuery:
             and self.external_bang == other.external_bang
 
 
-def send_http_request(engine, request_params):
-    # create dictionary which contain all
-    # informations about the request
-    request_args = dict(
-        headers=request_params['headers'],
-        cookies=request_params['cookies'],
-        verify=request_params['verify'],
-        auth=request_params['auth']
-    )
-
-    # setting engine based proxies
-    if hasattr(engine, 'proxies'):
-        request_args['proxies'] = requests_lib.get_proxies(engine.proxies)
-
-    # max_redirects
-    max_redirects = request_params.get('max_redirects')
-    if max_redirects:
-        request_args['max_redirects'] = max_redirects
-
-    # soft_max_redirects
-    soft_max_redirects = request_params.get('soft_max_redirects', max_redirects or 0)
-
-    # raise_for_status
-    request_args['raise_for_httperror'] = request_params.get('raise_for_httperror', False)
-
-    # specific type of request (GET or POST)
-    if request_params['method'] == 'GET':
-        req = requests_lib.get
-    else:
-        req = requests_lib.post
-
-    request_args['data'] = request_params['data']
-
-    # send the request
-    response = req(request_params['url'], **request_args)
-
-    # check soft limit of the redirect count
-    if len(response.history) > soft_max_redirects:
-        # unexpected redirect : record an error
-        # but the engine might still return valid results.
-        status_code = str(response.status_code or '')
-        reason = response.reason or ''
-        hostname = str(urlparse(response.url or '').netloc)
-        record_error(engine.name,
-                     '{} redirects, maximum: {}'.format(len(response.history), soft_max_redirects),
-                     (status_code, reason, hostname))
-
-    return response
-
-
-def search_one_http_request(engine, query, request_params):
-    # update request parameters dependent on
-    # search-engine (contained in engines folder)
-    engine.request(query, request_params)
-
-    # ignoring empty urls
-    if request_params['url'] is None:
-        return None
-
-    if not request_params['url']:
-        return None
-
-    # send request
-    response = send_http_request(engine, request_params)
-
-    # parse the response
-    response.search_params = request_params
-    return engine.response(response)
-
-
-def search_one_http_request_safe(engine_name, query, request_params, result_container, start_time, timeout_limit):
-    # set timeout for all HTTP requests
-    requests_lib.set_timeout_for_thread(timeout_limit, start_time=start_time)
-    # reset the HTTP total time
-    requests_lib.reset_time_for_thread()
-
-    #
-    engine = engines[engine_name]
-
-    # suppose everything will be alright
-    requests_exception = False
-    suspended_time = None
-
-    try:
-        # send requests and parse the results
-        search_results = search_one_http_request(engine, query, request_params)
-
-        # check if the engine accepted the request
-        if search_results is not None:
-            # yes, so add results
-            result_container.extend(engine_name, search_results)
-
-            # update engine time when there is no exception
-            engine_time = time() - start_time
-            page_load_time = requests_lib.get_time_for_thread()
-            result_container.add_timing(engine_name, engine_time, page_load_time)
-            with threading.RLock():
-                engine.stats['engine_time'] += engine_time
-                engine.stats['engine_time_count'] += 1
-                # update stats with the total HTTP time
-                engine.stats['page_load_time'] += page_load_time
-                engine.stats['page_load_count'] += 1
-    except Exception as e:
-        record_exception(engine_name, e)
-
-        # Timing
-        engine_time = time() - start_time
-        page_load_time = requests_lib.get_time_for_thread()
-        result_container.add_timing(engine_name, engine_time, page_load_time)
-
-        # Record the errors
-        with threading.RLock():
-            engine.stats['errors'] += 1
-
-        if (issubclass(e.__class__, requests.exceptions.Timeout)):
-            result_container.add_unresponsive_engine(engine_name, 'HTTP timeout')
-            # requests timeout (connect or read)
-            logger.error("engine {0} : HTTP requests timeout"
-                         "(search duration : {1} s, timeout: {2} s) : {3}"
-                         .format(engine_name, engine_time, timeout_limit, e.__class__.__name__))
-            requests_exception = True
-        elif (issubclass(e.__class__, requests.exceptions.RequestException)):
-            result_container.add_unresponsive_engine(engine_name, 'HTTP error')
-            # other requests exception
-            logger.exception("engine {0} : requests exception"
-                             "(search duration : {1} s, timeout: {2} s) : {3}"
-                             .format(engine_name, engine_time, timeout_limit, e))
-            requests_exception = True
-        elif (issubclass(e.__class__, SearxEngineCaptchaException)):
-            result_container.add_unresponsive_engine(engine_name, 'CAPTCHA required')
-            logger.exception('engine {0} : CAPTCHA')
-            suspended_time = e.suspended_time  # pylint: disable=no-member
-        elif (issubclass(e.__class__, SearxEngineTooManyRequestsException)):
-            result_container.add_unresponsive_engine(engine_name, 'too many requests')
-            logger.exception('engine {0} : Too many requests')
-            suspended_time = e.suspended_time  # pylint: disable=no-member
-        elif (issubclass(e.__class__, SearxEngineAccessDeniedException)):
-            result_container.add_unresponsive_engine(engine_name, 'blocked')
-            logger.exception('engine {0} : Searx is blocked')
-            suspended_time = e.suspended_time  # pylint: disable=no-member
-        else:
-            result_container.add_unresponsive_engine(engine_name, 'unexpected crash')
-            # others errors
-            logger.exception('engine {0} : exception : {1}'.format(engine_name, e))
-    else:
-        if getattr(threading.current_thread(), '_timeout', False):
-            record_error(engine_name, 'Timeout')
-
-    # suspend the engine if there is an HTTP error
-    # or suspended_time is defined
-    with threading.RLock():
-        if requests_exception or suspended_time:
-            # update continuous_errors / suspend_end_time
-            engine.continuous_errors += 1
-            if suspended_time is None:
-                suspended_time = min(settings['search']['max_ban_time_on_fail'],
-                                     engine.continuous_errors * settings['search']['ban_time_on_fail'])
-            engine.suspend_end_time = time() + suspended_time
-        else:
-            # reset the suspend variables
-            engine.continuous_errors = 0
-            engine.suspend_end_time = 0
-
-
-def record_offline_engine_stats_on_error(engine, result_container, start_time):
-    engine_time = time() - start_time
-    result_container.add_timing(engine.name, engine_time, engine_time)
-
-    with threading.RLock():
-        engine.stats['errors'] += 1
-
-
-def search_one_offline_request(engine, query, request_params):
-    return engine.search(query, request_params)
-
-
-def search_one_offline_request_safe(engine_name, query, request_params, result_container, start_time, timeout_limit):
-    engine = engines[engine_name]
-
-    try:
-        search_results = search_one_offline_request(engine, query, request_params)
-
-        if search_results:
-            result_container.extend(engine_name, search_results)
-
-            engine_time = time() - start_time
-            result_container.add_timing(engine_name, engine_time, engine_time)
-            with threading.RLock():
-                engine.stats['engine_time'] += engine_time
-                engine.stats['engine_time_count'] += 1
-
-    except ValueError as e:
-        record_exception(engine_name, e)
-        record_offline_engine_stats_on_error(engine, result_container, start_time)
-        logger.exception('engine {0} : invalid input : {1}'.format(engine_name, e))
-    except Exception as e:
-        record_exception(engine_name, e)
-        record_offline_engine_stats_on_error(engine, result_container, start_time)
-        result_container.add_unresponsive_engine(engine_name, 'unexpected crash', str(e))
-        logger.exception('engine {0} : exception : {1}'.format(engine_name, e))
-    else:
-        if getattr(threading.current_thread(), '_timeout', False):
-            record_error(engine_name, 'Timeout')
-
-
-def search_one_request_safe(engine_name, query, request_params, result_container, start_time, timeout_limit):
-    if engines[engine_name].offline:
-        return search_one_offline_request_safe(engine_name, query, request_params, result_container, start_time, timeout_limit)  # noqa
-    return search_one_http_request_safe(engine_name, query, request_params, result_container, start_time, timeout_limit)
-
-
-# get default reqest parameter
-def default_request_params():
-    return {
-        'method': 'GET',
-        'headers': {},
-        'data': {},
-        'url': '',
-        'cookies': {},
-        'verify': True,
-        'auth': None,
-        'raise_for_httperror': True
-    }
-
-
 class Search:
     """Search information container"""
 
@@ -375,69 +149,20 @@ class Search:
             return True
         return False
 
-    def _is_accepted(self, engine_name, engine):
-        # skip suspended engines
-        if engine.suspend_end_time >= time():
-            logger.debug('Engine currently suspended: %s', engine_name)
-            return False
-
-        # if paging is not supported, skip
-        if self.search_query.pageno > 1 and not engine.paging:
-            return False
-
-        # if time_range is not supported, skip
-        if self.search_query.time_range and not engine.time_range_support:
-            return False
-
-        return True
-
-    def _get_params(self, engineref, user_agent):
-        if engineref.name not in engines:
-            return None, None
-
-        engine = engines[engineref.name]
-
-        if not self._is_accepted(engineref.name, engine):
-            return None, None
-
-        # set default request parameters
-        request_params = {}
-        if not engine.offline:
-            request_params = default_request_params()
-            request_params['headers']['User-Agent'] = user_agent
-
-            if hasattr(engine, 'language') and engine.language:
-                request_params['language'] = engine.language
-            else:
-                request_params['language'] = self.search_query.lang
-
-            request_params['safesearch'] = self.search_query.safesearch
-            request_params['time_range'] = self.search_query.time_range
-
-        request_params['category'] = engineref.category
-        request_params['pageno'] = self.search_query.pageno
-
-        with threading.RLock():
-            engine.stats['sent_search_count'] += 1
-
-        return request_params, engine.timeout
-
     # do search-request
     def _get_requests(self):
         # init vars
         requests = []
 
-        # set default useragent
-        # user_agent = request.headers.get('User-Agent', '')
-        user_agent = gen_useragent()
-
         # max of all selected engine timeout
         default_timeout = 0
 
         # start search-reqest for all selected engines
         for engineref in self.search_query.engineref_list:
+            processor = processors[engineref.name]
+
             # set default request parameters
-            request_params, engine_timeout = self._get_params(engineref, user_agent)
+            request_params = processor.get_params(self.search_query, engineref.category)
             if request_params is None:
                 continue
 
@@ -445,7 +170,7 @@ class Search:
             requests.append((engineref.name, self.search_query.query, request_params))
 
             # update default_timeout
-            default_timeout = max(default_timeout, engine_timeout)
+            default_timeout = max(default_timeout, processor.engine.timeout)
 
         # adjust timeout
         actual_timeout = default_timeout
@@ -474,8 +199,8 @@ class Search:
 
         for engine_name, query, request_params in requests:
             th = threading.Thread(
-                target=search_one_request_safe,
-                args=(engine_name, query, request_params, self.result_container, self.start_time, self.actual_timeout),
+                target=processors[engine_name].search,
+                args=(query, request_params, self.result_container, self.start_time, self.actual_timeout),
                 name=search_id,
             )
             th._timeout = False
diff --git a/searx/search/processors/__init__.py b/searx/search/processors/__init__.py
new file mode 100644
index 000000000..4cae3cd0f
--- /dev/null
+++ b/searx/search/processors/__init__.py
@@ -0,0 +1,41 @@
+# SPDX-License-Identifier: AGPL-3.0-or-later
+
+from .online import OnlineProcessor
+from .offline import OfflineProcessor
+from .online_dictionary import OnlineDictionaryProcessor
+from .online_currency import OnlineCurrencyProcessor
+from .abstract import EngineProcessor
+from searx import logger
+import searx.engines as engines
+
+
+__all__ = ['EngineProcessor', 'OfflineProcessor', 'OnlineProcessor',
+           'OnlineDictionaryProcessor', 'OnlineCurrencyProcessor', 'processors']
+logger = logger.getChild('search.processors')
+processors = {}
+
+
+def get_processor_class(engine_type):
+    for c in [OnlineProcessor, OfflineProcessor, OnlineDictionaryProcessor, OnlineCurrencyProcessor]:
+        if c.engine_type == engine_type:
+            return c
+    return None
+
+
+def get_processor(engine, engine_name):
+    engine_type = getattr(engine, 'engine_type', 'online')
+    processor_class = get_processor_class(engine_type)
+    if processor_class:
+        return processor_class(engine, engine_name)
+    else:
+        return None
+
+
+def initialize(engine_list):
+    engines.initialize_engines(engine_list)
+    for engine_name, engine in engines.engines.items():
+        processor = get_processor(engine, engine_name)
+        if processor is None:
+            logger.error('Error get processor for engine %s', engine_name)
+        else:
+            processors[engine_name] = processor
diff --git a/searx/search/processors/abstract.py b/searx/search/processors/abstract.py
new file mode 100644
index 000000000..cf3fd7236
--- /dev/null
+++ b/searx/search/processors/abstract.py
@@ -0,0 +1,39 @@
+# SPDX-License-Identifier: AGPL-3.0-or-later
+
+from abc import abstractmethod
+from searx import logger
+
+
+logger = logger.getChild('searx.search.processor')
+
+
+class EngineProcessor:
+
+    def __init__(self, engine, engine_name):
+        self.engine = engine
+        self.engine_name = engine_name
+
+    def get_params(self, search_query, engine_category):
+        # if paging is not supported, skip
+        if search_query.pageno > 1 and not self.engine.paging:
+            return None
+
+        # if time_range is not supported, skip
+        if search_query.time_range and not self.engine.time_range_support:
+            return None
+
+        params = {}
+        params['category'] = engine_category
+        params['pageno'] = search_query.pageno
+        params['safesearch'] = search_query.safesearch
+        params['time_range'] = search_query.time_range
+
+        if hasattr(self.engine, 'language') and self.engine.language:
+            params['language'] = self.engine.language
+        else:
+            params['language'] = search_query.lang
+        return params
+
+    @abstractmethod
+    def search(self, query, params, result_container, start_time, timeout_limit):
+        pass
diff --git a/searx/search/processors/offline.py b/searx/search/processors/offline.py
new file mode 100644
index 000000000..ede8eb5e1
--- /dev/null
+++ b/searx/search/processors/offline.py
@@ -0,0 +1,51 @@
+# SPDX-License-Identifier: AGPL-3.0-or-later
+
+import threading
+from time import time
+from searx import logger
+from searx.metrology.error_recorder import record_exception, record_error
+from searx.search.processors.abstract import EngineProcessor
+
+
+logger = logger.getChild('search.processor.offline')
+
+
+class OfflineProcessor(EngineProcessor):
+
+    engine_type = 'offline'
+
+    def _record_stats_on_error(self, result_container, start_time):
+        engine_time = time() - start_time
+        result_container.add_timing(self.engine_name, engine_time, engine_time)
+
+        with threading.RLock():
+            self.engine.stats['errors'] += 1
+
+    def _search_basic(self, query, params):
+        return self.engine.search(query, params)
+
+    def search(self, query, params, result_container, start_time, timeout_limit):
+        try:
+            search_results = self._search_basic(query, params)
+
+            if search_results:
+                result_container.extend(self.engine_name, search_results)
+
+                engine_time = time() - start_time
+                result_container.add_timing(self.engine_name, engine_time, engine_time)
+                with threading.RLock():
+                    self.engine.stats['engine_time'] += engine_time
+                    self.engine.stats['engine_time_count'] += 1
+
+        except ValueError as e:
+            record_exception(self.engine_name, e)
+            self._record_stats_on_error(result_container, start_time)
+            logger.exception('engine {0} : invalid input : {1}'.format(self.engine_name, e))
+        except Exception as e:
+            record_exception(self.engine_name, e)
+            self._record_stats_on_error(result_container, start_time)
+            result_container.add_unresponsive_engine(self.engine_name, 'unexpected crash', str(e))
+            logger.exception('engine {0} : exception : {1}'.format(self.engine_name, e))
+        else:
+            if getattr(threading.current_thread(), '_timeout', False):
+                record_error(self.engine_name, 'Timeout')
diff --git a/searx/search/processors/online.py b/searx/search/processors/online.py
new file mode 100644
index 000000000..17bbfef0f
--- /dev/null
+++ b/searx/search/processors/online.py
@@ -0,0 +1,211 @@
+# SPDX-License-Identifier: AGPL-3.0-or-later
+
+from urllib.parse import urlparse
+from time import time
+import threading
+
+import requests.exceptions
+
+import searx.poolrequests as poolrequests
+from searx.engines import settings
+from searx import logger
+from searx.utils import gen_useragent
+from searx.exceptions import (SearxEngineAccessDeniedException, SearxEngineCaptchaException,
+                              SearxEngineTooManyRequestsException,)
+from searx.metrology.error_recorder import record_exception, record_error
+
+from searx.search.processors.abstract import EngineProcessor
+
+
+logger = logger.getChild('search.processor.online')
+
+DEFAULT_PARAMS = {
+    'method': 'GET',
+    'headers': {},
+    'data': {},
+    'url': '',
+    'cookies': {},
+    'verify': True,
+    'auth': None
+}
+
+
+class OnlineProcessor(EngineProcessor):
+
+    engine_type = 'online'
+
+    def get_params(self, search_query, engine_category):
+        params = super().get_params(search_query, engine_category)
+        if params is None:
+            return None
+
+        # skip suspended engines
+        if self.engine.suspend_end_time >= time():
+            logger.debug('Engine currently suspended: %s', self.engine_name)
+            return None
+
+        # add default params
+        params.update(DEFAULT_PARAMS)
+
+        # add an user agent
+        params['headers']['User-Agent'] = gen_useragent()
+
+        return params
+
+    def _send_http_request(self, params):
+        # create dictionary which contain all
+        # informations about the request
+        request_args = dict(
+            headers=params['headers'],
+            cookies=params['cookies'],
+            verify=params['verify'],
+            auth=params['auth']
+        )
+
+        # setting engine based proxies
+        if hasattr(self.engine, 'proxies'):
+            request_args['proxies'] = poolrequests.get_proxies(self.engine.proxies)
+
+        # max_redirects
+        max_redirects = params.get('max_redirects')
+        if max_redirects:
+            request_args['max_redirects'] = max_redirects
+
+        # soft_max_redirects
+        soft_max_redirects = params.get('soft_max_redirects', max_redirects or 0)
+
+        # raise_for_status
+        request_args['raise_for_httperror'] = params.get('raise_for_httperror', False)
+
+        # specific type of request (GET or POST)
+        if params['method'] == 'GET':
+            req = poolrequests.get
+        else:
+            req = poolrequests.post
+
+        request_args['data'] = params['data']
+
+        # send the request
+        response = req(params['url'], **request_args)
+
+        # check soft limit of the redirect count
+        if len(response.history) > soft_max_redirects:
+            # unexpected redirect : record an error
+            # but the engine might still return valid results.
+            status_code = str(response.status_code or '')
+            reason = response.reason or ''
+            hostname = str(urlparse(response.url or '').netloc)
+            record_error(self.engine_name,
+                         '{} redirects, maximum: {}'.format(len(response.history), soft_max_redirects),
+                         (status_code, reason, hostname))
+
+        return response
+
+    def _search_basic(self, query, params):
+        # update request parameters dependent on
+        # search-engine (contained in engines folder)
+        self.engine.request(query, params)
+
+        # ignoring empty urls
+        if params['url'] is None:
+            return None
+
+        if not params['url']:
+            return None
+
+        # send request
+        response = self._send_http_request(params)
+
+        # parse the response
+        response.search_params = params
+        return self.engine.response(response)
+
+    def search(self, query, params, result_container, start_time, timeout_limit):
+        # set timeout for all HTTP requests
+        poolrequests.set_timeout_for_thread(timeout_limit, start_time=start_time)
+        # reset the HTTP total time
+        poolrequests.reset_time_for_thread()
+
+        # suppose everything will be alright
+        requests_exception = False
+        suspended_time = None
+
+        try:
+            # send requests and parse the results
+            search_results = self._search_basic(query, params)
+
+            # check if the engine accepted the request
+            if search_results is not None:
+                # yes, so add results
+                result_container.extend(self.engine_name, search_results)
+
+                # update engine time when there is no exception
+                engine_time = time() - start_time
+                page_load_time = poolrequests.get_time_for_thread()
+                result_container.add_timing(self.engine_name, engine_time, page_load_time)
+                with threading.RLock():
+                    self.engine.stats['engine_time'] += engine_time
+                    self.engine.stats['engine_time_count'] += 1
+                    # update stats with the total HTTP time
+                    self.engine.stats['page_load_time'] += page_load_time
+                    self.engine.stats['page_load_count'] += 1
+        except Exception as e:
+            record_exception(self.engine_name, e)
+
+            # Timing
+            engine_time = time() - start_time
+            page_load_time = poolrequests.get_time_for_thread()
+            result_container.add_timing(self.engine_name, engine_time, page_load_time)
+
+            # Record the errors
+            with threading.RLock():
+                self.engine.stats['errors'] += 1
+
+            if (issubclass(e.__class__, requests.exceptions.Timeout)):
+                result_container.add_unresponsive_engine(self.engine_name, 'HTTP timeout')
+                # requests timeout (connect or read)
+                logger.error("engine {0} : HTTP requests timeout"
+                             "(search duration : {1} s, timeout: {2} s) : {3}"
+                             .format(self.engine_name, engine_time, timeout_limit, e.__class__.__name__))
+                requests_exception = True
+            elif (issubclass(e.__class__, requests.exceptions.RequestException)):
+                result_container.add_unresponsive_engine(self.engine_name, 'HTTP error')
+                # other requests exception
+                logger.exception("engine {0} : requests exception"
+                                 "(search duration : {1} s, timeout: {2} s) : {3}"
+                                 .format(self.engine_name, engine_time, timeout_limit, e))
+                requests_exception = True
+            elif (issubclass(e.__class__, SearxEngineCaptchaException)):
+                result_container.add_unresponsive_engine(self.engine_name, 'CAPTCHA required')
+                logger.exception('engine {0} : CAPTCHA')
+                suspended_time = e.suspended_time  # pylint: disable=no-member
+            elif (issubclass(e.__class__, SearxEngineTooManyRequestsException)):
+                result_container.add_unresponsive_engine(self.engine_name, 'too many requests')
+                logger.exception('engine {0} : Too many requests')
+                suspended_time = e.suspended_time  # pylint: disable=no-member
+            elif (issubclass(e.__class__, SearxEngineAccessDeniedException)):
+                result_container.add_unresponsive_engine(self.engine_name, 'blocked')
+                logger.exception('engine {0} : Searx is blocked')
+                suspended_time = e.suspended_time  # pylint: disable=no-member
+            else:
+                result_container.add_unresponsive_engine(self.engine_name, 'unexpected crash')
+                # others errors
+                logger.exception('engine {0} : exception : {1}'.format(self.engine_name, e))
+        else:
+            if getattr(threading.current_thread(), '_timeout', False):
+                record_error(self.engine_name, 'Timeout')
+
+        # suspend the engine if there is an HTTP error
+        # or suspended_time is defined
+        with threading.RLock():
+            if requests_exception or suspended_time:
+                # update continuous_errors / suspend_end_time
+                self.engine.continuous_errors += 1
+                if suspended_time is None:
+                    suspended_time = min(settings['search']['max_ban_time_on_fail'],
+                                         self.engine.continuous_errors * settings['search']['ban_time_on_fail'])
+                self.engine.suspend_end_time = time() + suspended_time
+            else:
+                # reset the suspend variables
+                self.engine.continuous_errors = 0
+                self.engine.suspend_end_time = 0
diff --git a/searx/search/processors/online_currency.py b/searx/search/processors/online_currency.py
new file mode 100644
index 000000000..f0e919c03
--- /dev/null
+++ b/searx/search/processors/online_currency.py
@@ -0,0 +1,57 @@
+# SPDX-License-Identifier: AGPL-3.0-or-later
+
+import unicodedata
+import re
+
+from searx.data import CURRENCIES
+from .online import OnlineProcessor
+
+
+parser_re = re.compile('.*?(\\d+(?:\\.\\d+)?) ([^.0-9]+) (?:in|to) ([^.0-9]+)', re.I)
+
+
+def normalize_name(name):
+    name = name.lower().replace('-', ' ').rstrip('s')
+    name = re.sub(' +', ' ', name)
+    return unicodedata.normalize('NFKD', name).lower()
+
+
+def name_to_iso4217(name):
+    global CURRENCIES
+    name = normalize_name(name)
+    currency = CURRENCIES['names'].get(name, [name])
+    return currency[0]
+
+
+def iso4217_to_name(iso4217, language):
+    global CURRENCIES
+    return CURRENCIES['iso4217'].get(iso4217, {}).get(language, iso4217)
+
+
+class OnlineCurrencyProcessor(OnlineProcessor):
+
+    engine_type = 'online_currency'
+
+    def get_params(self, search_query, engine_category):
+        params = super().get_params(search_query, engine_category)
+        if params is None:
+            return None
+
+        m = parser_re.match(search_query.query)
+        if not m:
+            return None
+
+        amount_str, from_currency, to_currency = m.groups()
+        try:
+            amount = float(amount_str)
+        except ValueError:
+            return None
+        from_currency = name_to_iso4217(from_currency.strip())
+        to_currency = name_to_iso4217(to_currency.strip())
+
+        params['amount'] = amount
+        params['from'] = from_currency
+        params['to'] = to_currency
+        params['from_name'] = iso4217_to_name(from_currency, 'en')
+        params['to_name'] = iso4217_to_name(to_currency, 'en')
+        return params
diff --git a/searx/search/processors/online_dictionary.py b/searx/search/processors/online_dictionary.py
new file mode 100644
index 000000000..8e9ef1620
--- /dev/null
+++ b/searx/search/processors/online_dictionary.py
@@ -0,0 +1,37 @@
+# SPDX-License-Identifier: AGPL-3.0-or-later
+
+import re
+
+from searx.utils import is_valid_lang
+from .online import OnlineProcessor
+
+
+parser_re = re.compile('.*?([a-z]+)-([a-z]+) ([^ ]+)$', re.I)
+
+
+class OnlineDictionaryProcessor(OnlineProcessor):
+
+    engine_type = 'online_dictionnary'
+
+    def get_params(self, search_query, engine_category):
+        params = super().get_params(search_query, engine_category)
+        if params is None:
+            return None
+
+        m = parser_re.match(search_query.query)
+        if not m:
+            return None
+
+        from_lang, to_lang, query = m.groups()
+
+        from_lang = is_valid_lang(from_lang)
+        to_lang = is_valid_lang(to_lang)
+
+        if not from_lang or not to_lang:
+            return None
+
+        params['from_lang'] = from_lang
+        params['to_lang'] = to_lang
+        params['query'] = query
+
+        return params
diff --git a/searx/webapp.py b/searx/webapp.py
index ace5a12dc..5076355d0 100755
--- a/searx/webapp.py
+++ b/searx/webapp.py
@@ -60,7 +60,7 @@ from searx import brand, static_path
 from searx import settings, searx_dir, searx_debug
 from searx.exceptions import SearxParameterException
 from searx.engines import (
-    categories, engines, engine_shortcuts, get_engines_stats, initialize_engines
+    categories, engines, engine_shortcuts, get_engines_stats
 )
 from searx.webutils import (
     UnicodeWriter, highlight_content, get_resources_directory,
@@ -71,7 +71,7 @@ from searx.webadapter import get_search_query_from_webapp, get_selected_categori
 from searx.utils import html_to_text, gen_useragent, dict_subset, match_language
 from searx.version import VERSION_STRING
 from searx.languages import language_codes as languages
-from searx.search import SearchWithPlugins
+from searx.search import SearchWithPlugins, initialize
 from searx.query import RawTextQuery
 from searx.autocomplete import searx_bang, backends as autocomplete_backends
 from searx.plugins import plugins
@@ -131,7 +131,7 @@ werkzeug_reloader = flask_run_development or (searx_debug and __name__ == "__mai
 # initialize the engines except on the first run of the werkzeug server.
 if not werkzeug_reloader\
    or (werkzeug_reloader and os.environ.get("WERKZEUG_RUN_MAIN") == "true"):
-    initialize_engines(settings['engines'])
+    initialize()
 
 babel = Babel(app)
 
diff --git a/tests/unit/test_search.py b/tests/unit/test_search.py
index 464a9b37d..9938a43a5 100644
--- a/tests/unit/test_search.py
+++ b/tests/unit/test_search.py
@@ -3,7 +3,6 @@
 from searx.testing import SearxTestCase
 from searx.search import SearchQuery, EngineRef
 import searx.search
-import searx.engines
 
 
 SAFESEARCH = 0
@@ -39,7 +38,7 @@ class SearchTestCase(SearxTestCase):
 
     @classmethod
     def setUpClass(cls):
-        searx.engines.initialize_engines(TEST_ENGINES)
+        searx.search.initialize(TEST_ENGINES)
 
     def test_timeout_simple(self):
         searx.search.max_request_timeout = None
diff --git a/tests/unit/test_standalone_searx.py b/tests/unit/test_standalone_searx.py
index 74e31369f..06d70246a 100644
--- a/tests/unit/test_standalone_searx.py
+++ b/tests/unit/test_standalone_searx.py
@@ -8,8 +8,7 @@ import sys
 from mock import Mock, patch
 from nose2.tools import params
 
-from searx.search import SearchQuery, EngineRef
-from searx.engines import initialize_engines
+from searx.search import SearchQuery, EngineRef, initialize
 from searx.testing import SearxTestCase
 
 
@@ -30,7 +29,7 @@ class StandaloneSearx(SearxTestCase):
     def setUpClass(cls):
         engine_list = [{'engine': 'dummy', 'name': 'engine1', 'shortcut': 'e1'}]
 
-        initialize_engines(engine_list)
+        initialize(engine_list)
 
     def test_parse_argument_no_args(self):
         """Test parse argument without args."""
diff --git a/tests/unit/test_webadapter.py b/tests/unit/test_webadapter.py
index f620cf300..32417f019 100644
--- a/tests/unit/test_webadapter.py
+++ b/tests/unit/test_webadapter.py
@@ -17,7 +17,7 @@ TEST_ENGINES = [
         'categories': 'general',
         'shortcut': 'do',
         'timeout': 3.0,
-        'offline': True,
+        'engine_type': 'offline',
         'tokens': ['my-token'],
     },
 ]
@@ -28,7 +28,7 @@ class ValidateQueryCase(SearxTestCase):
 
     @classmethod
     def setUpClass(cls):
-        searx.engines.initialize_engines(TEST_ENGINES)
+        searx.search.initialize(TEST_ENGINES)
 
     def test_query_private_engine_without_token(self):
         preferences = Preferences(['oscar'], ['general'], engines, [])
diff --git a/utils/standalone_searx.py b/utils/standalone_searx.py
index 0a35cc4a2..c52035fb9 100755
--- a/utils/standalone_searx.py
+++ b/utils/standalone_searx.py
@@ -6,8 +6,8 @@ Getting categories without initiate the engine will only return `['general']`
 >>> import searx.engines
 ... list(searx.engines.categories.keys())
 ['general']
->>> import searx
-... searx.engines.initialize_engines(searx.settings['engines'])
+>>> import searx.search
+... searx.search.initialize()
 ... list(searx.engines.categories.keys())
 ['general', 'it', 'science', 'images', 'news', 'videos', 'music', 'files', 'social media', 'map']
 
@@ -22,11 +22,11 @@ Example to run it from python:
 >>> import importlib
 ... import json
 ... import sys
-... import searx
 ... import searx.engines
+... import searx.search
 ... search_query = 'rain'
 ... # initialize engines
-... searx.engines.initialize_engines(searx.settings['engines'])
+... searx.search.initialize()
 ... # load engines categories once instead of each time the function called
 ... engine_cs = list(searx.engines.categories.keys())
 ... # load module
@@ -82,7 +82,6 @@ from json import dumps
 from typing import Any, Dict, List, Optional
 
 import searx
-import searx.engines
 import searx.preferences
 import searx.query
 import searx.search
@@ -208,7 +207,7 @@ def parse_argument(
 
 
 if __name__ == '__main__':
-    searx.engines.initialize_engines(searx.settings['engines'])
+    searx.search.initialize()
     engine_cs = list(searx.engines.categories.keys())
     prog_args = parse_argument(category_choices=engine_cs)
     search_q = get_search_query(prog_args, engine_categories=engine_cs)