[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.

7 files changed, 449 insertions, 288 deletions

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