Issues #562,#561,#560:

src/backend/api/handlers.py

@@ -78,6 +78,21 @@ async def _get_nearest_mirrors_by_network_data(
     The function returns mirrors which are in the same subnet or have the same
     ASN as a request's IP
     """
+
+    def _is_additional_mirrors_suitable(
+            mirror_data: MirrorData,
+            main_list_of_mirrors: list[MirrorData]
+    ) -> bool:
+        """
+        An additional mirror is a mirror
+        which is fresh (not outdated), not flapping and public, because
+        all suitable private mirrors we already found,
+        using ASN or subnets data
+        """
+        return mirror_data.status == 'ok' and \
+        not mirror_data.private and \
+        mirror_data not in main_list_of_mirrors
+
     match = get_geo_data_by_ip(ip_address)
     asn = get_asn_by_ip(ip_address)
     suitable_mirrors = []
@@ -105,15 +120,22 @@ async def _get_nearest_mirrors_by_network_data(
     if 1 <= len(suitable_mirrors) < LENGTH_CLOUD_MIRRORS_LIST\
             and match is not None:
         continent, country, _, _, latitude, longitude = match
-        suitable_mirrors.extend(
-            mirror['mirror'] for mirror in
-            sort_mirrors_by_distance_and_country(
-                request_geo_data=(latitude, longitude),
-                mirrors=[mirror for mirror in mirrors
-                         if mirror not in suitable_mirrors],
-                country=country,
-            )[:LENGTH_CLOUD_MIRRORS_LIST - len(suitable_mirrors)]
+        not_sorted_additional_mirrors = [
+            mirror for mirror in mirrors if _is_additional_mirrors_suitable(
+                mirror_data=mirror,
+                main_list_of_mirrors=suitable_mirrors,
+            )
+        ]
+        sorted_additional_mirrors = sort_mirrors_by_distance_and_country(
+            request_geo_data=(latitude, longitude),
+            mirrors=not_sorted_additional_mirrors,
+            country=country,
         )
+        randomized_additional_mirrors = randomize_mirrors_within_distance(
+            mirrors=sorted_additional_mirrors,
+            country=country,
+        )[:LENGTH_CLOUD_MIRRORS_LIST - len(suitable_mirrors)]
+        suitable_mirrors.extend(randomized_additional_mirrors)
     return suitable_mirrors
 
 
@@ -186,7 +208,7 @@ async def _get_nearest_mirrors(
     if not suitable_mirrors:
         suitable_mirrors = await _get_nearest_mirrors_by_geo_data(
             ip_address=ip_address,
-            without_private_mirrors=without_private_mirrors,
+            without_private_mirrors=True,
         )
     await set_mirrors_to_cache(
         ip_address,

src/backend/api/mirrors_update.py

@@ -93,7 +93,7 @@ async def set_repo_status(
         ) as resp:
             timestamp_response = await resp.text()
     except (asyncio.exceptions.TimeoutError, HTTPError):
-        logger.error(
+        logger.warning(
             'Mirror "%s" has no timestamp file by url "%s"',
             mirror_info.name,
             timestamp_url,
@@ -107,7 +107,7 @@ async def set_repo_status(
         try:
             mirror_last_updated = float(timestamp_response)
         except ValueError:
-            logger.info(
+            logger.warning(
                 'Mirror "%s" has broken timestamp file by url "%s"',
                 mirror_info.name,
                 timestamp_url,

src/backend/api/redis.py

@@ -66,6 +66,37 @@ async def set_mirrors_to_cache(
         )
 
 
+async def get_subnets_from_cache(
+        key: str,
+) -> dict:
+    """
+    Get a cached subnets of Azure/AWS cloud
+    """
+    async with redis_context() as redis_engine:
+        subnets_string = await redis_engine.get(str(key))
+    if subnets_string is not None:
+        subnets_json = json.loads(
+            subnets_string,
+        )
+        return subnets_json
+
+
+async def set_subnets_to_cache(
+        key: str,
+        subnets: dict,
+) -> None:
+    """
+    Save a mirror list for specified IP to cache
+    """
+    async with redis_context() as redis_engine:
+        subnets = json.dumps(subnets)
+        await redis_engine.set(
+            str(key),
+            subnets,
+            24 * 60 * 60,
+        )
+
+
 async def get_geolocation_from_cache(
         key: str
 ) -> Union[tuple[float, float], tuple[None, None]]:

src/backend/api/utils.py

@@ -43,7 +43,9 @@
 from haversine import haversine
 from api.redis import (
     get_geolocation_from_cache,
-    set_geolocation_to_cache
+    set_geolocation_to_cache,
+    get_subnets_from_cache,
+    set_subnets_to_cache,
 )
 
 logger = get_logger(__name__)
@@ -152,7 +154,8 @@ def get_geo_data_by_ip(
     db = GeoIPEngine.get_instance()
     try:
         city = db.city(ip)
-    except AddressNotFoundError:
+    # ValueError will be raised in case of incorrect IP
+    except (AddressNotFoundError, ValueError):
         return
     try:
         city_name = city.city.name
@@ -209,7 +212,7 @@ async def get_azure_subnets_json(http_session: ClientSession) -> Optional[dict]:
             response_json = await resp.json(
                 content_type='application/octet-stream',
             )
-    except (ClientConnectorError, TimeoutError) as err:
+    except (ClientConnectorError, asyncio.exceptions.TimeoutError) as err:
         logger.error(
             'Cannot get json with Azure subnets by url "%s" because "%s"',
             link_to_json_url,
@@ -239,6 +242,9 @@ async def get_aws_subnets_json(http_session: ClientSession) -> Optional[dict]:
 
 
 async def get_azure_subnets(http_session: ClientSession):
+    subnets = await get_subnets_from_cache('azure_subnets')
+    if subnets is not None:
+        return subnets
     data_json = await get_azure_subnets_json(http_session=http_session)
     subnets = dict()
     if data_json is None:
@@ -249,10 +255,14 @@ async def get_azure_subnets(http_session: ClientSession):
             properties = value['properties']
             subnets[properties['region'].lower()] = \
                 properties['addressPrefixes']
+    await set_subnets_to_cache('azure_subnets', subnets)
     return subnets
 
 
 async def get_aws_subnets(http_session: ClientSession):
+    subnets = await get_subnets_from_cache('aws_subnets')
+    if subnets is not None:
+        return subnets
     data_json = await get_aws_subnets_json(http_session=http_session)
     subnets = defaultdict(list)
     if data_json is None:
@@ -261,6 +271,7 @@ async def get_aws_subnets(http_session: ClientSession):
         subnets[v4_prefix['region'].lower()].append(v4_prefix['ip_prefix'])
     for v6_prefix in data_json['ipv6_prefixes']:
         subnets[v6_prefix['region'].lower()].append(v6_prefix['ipv6_prefix'])
+    await set_subnets_to_cache('aws_subnets', subnets)
     return subnets