[fix] engine & network issues / documentation and type annotations

This patch fixes some quirks and issues related to the engines and the network.
Each engine has its own network and this network was broken for the following
engines[1]:

- archlinux
- bing
- dailymotion
- duckduckgo
- google
- peertube
- startpage
- wikipedia

Since the files have been touched anyway, the type annotaions of the engine
modules has also been completed so that error messages from the type checker are
no longer reported.

Related and (partial) fixed issue:

- [1] https://github.com/searxng/searxng/issues/762#issuecomment-1605323861
- [2] https://github.com/searxng/searxng/issues/2513
- [3] https://github.com/searxng/searxng/issues/2515

Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>

searx/engines/archlinux.py

@@ -14,7 +14,6 @@ from urllib.parse import urlencode, urljoin, urlparse
 import lxml
 import babel
 
-from searx import network
 from searx.utils import extract_text, eval_xpath_list, eval_xpath_getindex
 from searx.enginelib.traits import EngineTraits
 from searx.locales import language_tag
@@ -45,13 +44,13 @@ main_wiki = 'wiki.archlinux.org'
 def request(query, params):
 
     sxng_lang = params['searxng_locale'].split('-')[0]
-    netloc = traits.custom['wiki_netloc'].get(sxng_lang, main_wiki)
-    title = traits.custom['title'].get(sxng_lang, 'Special:Search')
+    netloc: str = traits.custom['wiki_netloc'].get(sxng_lang, main_wiki)  # type: ignore
+    title: str = traits.custom['title'].get(sxng_lang, 'Special:Search')  # type: ignore
     base_url = 'https://' + netloc + '/index.php?'
     offset = (params['pageno'] - 1) * 20
 
     if netloc == main_wiki:
-        eng_lang: str = traits.get_language(sxng_lang, 'English')
+        eng_lang: str = traits.get_language(sxng_lang, 'English')  # type: ignore
         query += ' (' + eng_lang + ')'
     elif netloc == 'wiki.archlinuxcn.org':
         base_url = 'https://' + netloc + '/wzh/index.php?'
@@ -71,11 +70,11 @@ def request(query, params):
 def response(resp):
 
     results = []
-    dom = lxml.html.fromstring(resp.text)
+    dom = lxml.html.fromstring(resp.text)  # type: ignore
 
     # get the base URL for the language in which request was made
     sxng_lang = resp.search_params['searxng_locale'].split('-')[0]
-    netloc = traits.custom['wiki_netloc'].get(sxng_lang, main_wiki)
+    netloc: str = traits.custom['wiki_netloc'].get(sxng_lang, main_wiki)  # type: ignore
     base_url = 'https://' + netloc + '/index.php?'
 
     for result in eval_xpath_list(dom, '//ul[@class="mw-search-results"]/li'):
@@ -83,7 +82,7 @@ def response(resp):
         content = extract_text(result.xpath('.//div[@class="searchresult"]'))
         results.append(
             {
-                'url': urljoin(base_url, link.get('href')),
+                'url': urljoin(base_url, link.get('href')),  # type: ignore
                 'title': extract_text(link),
                 'content': content,
             }
@@ -114,6 +113,8 @@ def fetch_traits(engine_traits: EngineTraits):
        },
 
     """
+    # pylint: disable=import-outside-toplevel
+    from searx.network import get  # see https://github.com/searxng/searxng/issues/762
 
     engine_traits.custom['wiki_netloc'] = {}
     engine_traits.custom['title'] = {}
@@ -125,11 +126,11 @@ def fetch_traits(engine_traits: EngineTraits):
         'zh': 'Special:搜索',
     }
 
-    resp = network.get('https://wiki.archlinux.org/')
-    if not resp.ok:
+    resp = get('https://wiki.archlinux.org/')
+    if not resp.ok:  # type: ignore
         print("ERROR: response from wiki.archlinix.org is not OK.")
 
-    dom = lxml.html.fromstring(resp.text)
+    dom = lxml.html.fromstring(resp.text)  # type: ignore
     for a in eval_xpath_list(dom, "//a[@class='interlanguage-link-target']"):
 
         sxng_tag = language_tag(babel.Locale.parse(a.get('lang'), sep='-'))
@@ -143,9 +144,9 @@ def fetch_traits(engine_traits: EngineTraits):
                 print("ERROR: title tag from %s (%s) is unknown" % (netloc, sxng_tag))
                 continue
             engine_traits.custom['wiki_netloc'][sxng_tag] = netloc
-            engine_traits.custom['title'][sxng_tag] = title
+            engine_traits.custom['title'][sxng_tag] = title  # type: ignore
 
         eng_tag = extract_text(eval_xpath_list(a, ".//span"))
-        engine_traits.languages[sxng_tag] = eng_tag
+        engine_traits.languages[sxng_tag] = eng_tag  # type: ignore
 
     engine_traits.languages['en'] = 'English'