[mod] one logger per engine

Suggested-by: @dalf in https://github.com/searxng/searxng/issues/98#issuecomment-849013518
Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>

manage

@@ -37,7 +37,7 @@ PYLINT_SEARX_DISABLE_OPTION="\
 I,C,R,\
 W0105,W0212,W0511,W0603,W0613,W0621,W0702,W0703,W1401,\
 E1136"
-PYLINT_ADDITIONAL_BUILTINS_FOR_ENGINES="supported_languages,language_aliases"
+PYLINT_ADDITIONAL_BUILTINS_FOR_ENGINES="supported_languages,language_aliases,logger"
 PYLINT_OPTIONS="-m pylint -j 0 --rcfile .pylintrc"
 
 help() {
@@ -588,6 +588,7 @@ test.pylint() {
     (   set -e
         build_msg TEST "[pylint] \$PYLINT_FILES"
         pyenv.cmd python ${PYLINT_OPTIONS} ${PYLINT_VERBOSE} \
+            --additional-builtins="${PYLINT_ADDITIONAL_BUILTINS_FOR_ENGINES}" \
             "${PYLINT_FILES[@]}"
 
         build_msg TEST "[pylint] searx/engines"

searx/engines/__init__.py

@@ -111,6 +111,7 @@ def load_engine(engine_data):
     if is_missing_required_attributes(engine):
         return None
 
+    engine.logger = logger.getChild(engine_name)
     return engine