[mod] multithreading only in searx.search.* packages

it prepares the new architecture change,
everything about multithreading in moved in the searx.search.* packages

previously the call to the "init" function of the engines was done in searx.engines:
* the network was not set (request not sent using the defined proxy)
* it requires to monkey patch the code to avoid HTTP requests during the tests

6 files changed, 69 insertions, 24 deletions

diff --git a/searx/search/__init__.py b/searx/search/__init__.py
index 9b26f38de..acc97d1e9 100644
--- a/searx/search/__init__.py
+++ b/searx/search/__init__.py
@@ -29,9 +29,11 @@ from searx.results import ResultContainer
 from searx import logger
 from searx.plugins import plugins
 from searx.search.models import EngineRef, SearchQuery
-from searx.search.processors import processors, initialize as initialize_processors
-from searx.search.checker import initialize as initialize_checker
+from searx.engines import load_engines
+from searx.network import initialize as initialize_network
 from searx.metrics import initialize as initialize_metrics, counter_inc, histogram_observe_time
+from searx.search.processors import PROCESSORS, initialize as initialize_processors
+from searx.search.checker import initialize as initialize_checker
 
 
 logger = logger.getChild('search')
@@ -50,8 +52,10 @@ else:
 
 def initialize(settings_engines=None, enable_checker=False):
     settings_engines = settings_engines or settings['engines']
-    initialize_processors(settings_engines)
+    load_engines(settings_engines)
+    initialize_network(settings_engines, settings['outgoing'])
     initialize_metrics([engine['name'] for engine in settings_engines])
+    initialize_processors(settings_engines)
     if enable_checker:
         initialize_checker()
 
@@ -106,7 +110,7 @@ class Search:
 
         # start search-reqest for all selected engines
         for engineref in self.search_query.engineref_list:
-            processor = processors[engineref.name]
+            processor = PROCESSORS[engineref.name]
 
             # stop the request now if the engine is suspend
             if processor.extend_container_if_suspended(self.result_container):
@@ -152,7 +156,7 @@ class Search:
 
         for engine_name, query, request_params in requests:
             th = threading.Thread(
-                target=processors[engine_name].search,
+                target=PROCESSORS[engine_name].search,
                 args=(query, request_params, self.result_container, self.start_time, self.actual_timeout),
                 name=search_id,
             )
diff --git a/searx/search/checker/__main__.py b/searx/search/checker/__main__.py
index 0d7d1b8ed..7f6de8f8b 100644
--- a/searx/search/checker/__main__.py
+++ b/searx/search/checker/__main__.py
@@ -8,7 +8,7 @@ import logging
 
 import searx.search
 import searx.search.checker
-from searx.search import processors
+from searx.search import PROCESSORS
 from searx.engines import engine_shortcuts
 
 
@@ -41,13 +41,13 @@ def iter_processor(engine_name_list):
     if len(engine_name_list) > 0:
         for name in engine_name_list:
             name = engine_shortcuts.get(name, name)
-            processor = processors.get(name)
+            processor = PROCESSORS.get(name)
             if processor is not None:
                 yield name, processor
             else:
                 stdout.write(f'{BOLD_SEQ}Engine {name:30}{RESET_SEQ}{RED}Engine does not exist{RESET_SEQ}')
     else:
-        for name, processor in searx.search.processors.items():
+        for name, processor in searx.search.PROCESSORS.items():
             yield name, processor
 
 
diff --git a/searx/search/checker/background.py b/searx/search/checker/background.py
index c3292d9ac..276426fa7 100644
--- a/searx/search/checker/background.py
+++ b/searx/search/checker/background.py
@@ -9,7 +9,7 @@ import signal
 
 from searx import logger, settings, searx_debug
 from searx.exceptions import SearxSettingsException
-from searx.search.processors import processors
+from searx.search.processors import PROCESSORS
 from searx.search.checker import Checker
 from searx.shared import schedule, storage
 
@@ -55,7 +55,7 @@ def run():
             'status': 'ok',
             'engines': {}
         }
-        for name, processor in processors.items():
+        for name, processor in PROCESSORS.items():
             logger.debug('Checking %s engine', name)
             checker = Checker(processor)
             checker.run()
diff --git a/searx/search/processors/__init__.py b/searx/search/processors/__init__.py
index caac74e65..d5ebdb70c 100644
--- a/searx/search/processors/__init__.py
+++ b/searx/search/processors/__init__.py
@@ -11,9 +11,11 @@ __all__ = [
     'OnlineProcessor',
     'OnlineDictionaryProcessor',
     'OnlineCurrencyProcessor',
-    'processors',
+    'PROCESSORS',
 ]
 
+import threading
+
 from searx import logger
 import searx.engines as engines
 
@@ -24,7 +26,7 @@ from .online_currency import OnlineCurrencyProcessor
 from .abstract import EngineProcessor
 
 logger = logger.getChild('search.processors')
-processors = {}
+PROCESSORS = {}
 """Cache request processores, stored by *engine-name* (:py:func:`initialize`)"""
 
 def get_processor_class(engine_type):
@@ -34,6 +36,7 @@ def get_processor_class(engine_type):
             return c
     return None
 
+
 def get_processor(engine, engine_name):
     """Return processor instance that fits to ``engine.engine.type``)"""
     engine_type = getattr(engine, 'engine_type', 'online')
@@ -42,12 +45,26 @@ def get_processor(engine, engine_name):
         return processor_class(engine, engine_name)
     return None
 
+
+def initialize_processor(processor):
+    """Initialize one processor
+
+    Call the init function of the engine
+    """
+    if processor.has_initialize_function:
+        t = threading.Thread(target=processor.initialize, daemon=True)
+        t.start()
+
+
 def initialize(engine_list):
-    """Initialize all engines and store a processor for each engine in :py:obj:`processors`."""
-    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
+    """Initialize all engines and store a processor for each engine in :py:obj:`PROCESSORS`."""
+    for engine_data in engine_list:
+        engine_name = engine_data['name']
+        engine = engines.engines.get(engine_name)
+        if engine:
+            processor = get_processor(engine, engine_name)
+            initialize_processor(processor)
+            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
index 38811d87c..81724f052 100644
--- a/searx/search/processors/abstract.py
+++ b/searx/search/processors/abstract.py
@@ -13,7 +13,8 @@ from searx import logger
 from searx.engines import settings
 from searx.network import get_time_for_thread, get_network
 from searx.metrics import histogram_observe, counter_inc, count_exception, count_error
-from searx.exceptions import SearxEngineAccessDeniedException
+from searx.exceptions import SearxEngineAccessDeniedException, SearxEngineResponseException
+from searx.utils import get_engine_from_settings
 
 logger = logger.getChild('searx.search.processor')
 SUSPENDED_STATUS = {}
@@ -66,6 +67,20 @@ class EngineProcessor(ABC):
         key = id(key) if key else self.engine_name
         self.suspended_status = SUSPENDED_STATUS.setdefault(key, SuspendedStatus())
 
+    def initialize(self):
+        try:
+            self.engine.init(get_engine_from_settings(self.engine_name))
+        except SearxEngineResponseException as exc:
+            logger.warn('%s engine: Fail to initialize // %s', self.engine_name, exc)
+        except Exception:  # pylint: disable=broad-except
+            logger.exception('%s engine: Fail to initialize', self.engine_name)
+        else:
+            logger.debug('%s engine: Initialized', self.engine_name)
+
+    @property
+    def has_initialize_function(self):
+        return hasattr(self.engine, 'init')
+
     def handle_exception(self, result_container, exception_or_message, suspend=False):
         # update result_container
         if isinstance(exception_or_message, BaseException):
diff --git a/searx/search/processors/online.py b/searx/search/processors/online.py
index 93a9c6cbf..48a514e8a 100644
--- a/searx/search/processors/online.py
+++ b/searx/search/processors/online.py
@@ -5,7 +5,7 @@
 
 """
 
-from time import time
+from timeit import default_timer
 import asyncio
 import httpx
 
@@ -40,6 +40,15 @@ class OnlineProcessor(EngineProcessor):
 
     engine_type = 'online'
 
+    def initialize(self):
+        # set timeout for all HTTP requests
+        searx.network.set_timeout_for_thread(self.engine.timeout, start_time=default_timer())
+        # reset the HTTP total time
+        searx.network.reset_time_for_thread()
+        # set the network
+        searx.network.set_context_network_name(self.engine_name)
+        super().initialize()
+
     def get_params(self, search_query, engine_category):
         params = super().get_params(search_query, engine_category)
         if params is None:
@@ -139,7 +148,7 @@ class OnlineProcessor(EngineProcessor):
             self.handle_exception(result_container, e, suspend=True)
             logger.error("engine {0} : HTTP requests timeout"
                          "(search duration : {1} s, timeout: {2} s) : {3}"
-                         .format(self.engine_name, time() - start_time,
+                         .format(self.engine_name, default_timer() - start_time,
                                  timeout_limit,
                                  e.__class__.__name__))
         except (httpx.HTTPError, httpx.StreamError) as e:
@@ -147,7 +156,7 @@ class OnlineProcessor(EngineProcessor):
             self.handle_exception(result_container, e, suspend=True)
             logger.exception("engine {0} : requests exception"
                              "(search duration : {1} s, timeout: {2} s) : {3}"
-                             .format(self.engine_name, time() - start_time,
+                             .format(self.engine_name, default_timer() - start_time,
                                      timeout_limit,
                                      e))
         except SearxEngineCaptchaException as e: