Mock up geoip2.database asn + city methods in contextmanager mode

tests/test_iplookup.py

@@ -4,11 +4,13 @@ Test ismijnverweg geolookup api
 import logging
 import random
 import re
+from ipaddress import ip_network
 from operator import itemgetter
+from unittest.mock import MagicMock, patch
 
+import geoip2.database
 from faker import Faker
 from fastapi.testclient import TestClient
-
 from main import app  # type: ignore
 
 # Set up logging
@@ -23,8 +25,148 @@ fake_ipv6 = fake.ipv6()
 client = TestClient(app, client=(fake_ipv6, 31337))
 
 
+def gen_testdata():
+    '''
+    Generate some mocked up GeoIP2 City/ASN entries
+    '''
+    continents = ('EU', 'NA', 'SA', 'AS', 'AU')
+    asns = {}
+    cities = {}
+    # get me max 10 networks to create mocked up entries
+    networks = list(filter(lambda network: (network.version == 4
+                                            and network.prefixlen < 32
+                                            and network.prefixlen >= 8)
+                           or (network.version == 6
+                               and network.prefixlen <= 64
+                               and network.prefixlen >= 56),
+                           (ip_network(fake.unique.ipv4_public(network=True)
+                                       if random.random() < 0.25
+                                       else fake.unique.ipv6(network=True))
+                            for _ in range(50))))[0:10]
+    for network in networks:
+        hostaddr = next(network.hosts())
+        logging.info('Using %s from %s', hostaddr, network)
+        asns[hostaddr] = geoip2.models.ASN(
+                hostaddr,
+                network=network,
+                autonomous_system_organization=fake.company(),
+                autonomous_system_number=fake.random_number(5))
+        cities[hostaddr] = geoip2.models.City(
+                locales=['en'],
+                city={'names': {'en': fake.city()}},
+                country={'iso_code': fake.country_code(),
+                         'names': {'en': fake.country()}},
+                continent={'code': random.choice(continents)})
+    return asns, cities
+
+
+def get_mock_reader(test_data):
+    '''
+    Mock the geoip2.database.Reader
+    '''
+
+    def _asn_lookup(ip):
+        try:
+            logging.info('Looking up ASN info for %s', ip)
+            return test_data[0][ip]
+        except KeyError as exc:
+            raise geoip2.errors.AddressNotFoundError(
+                    f'{ip} not in test database') from exc
+
+    def _city_lookup(ip):
+        try:
+            logging.info('Looking up City info for %s', ip)
+            return test_data[1][ip]
+        except KeyError as exc:
+            raise geoip2.errors.AddressNotFoundError(
+                    f'{ip} not in test database') from exc
+
+    mock_reader = MagicMock()
+    mock_reader_ctx = MagicMock()
+    mock_reader_ctx.test_data = test_data
+    mock_reader_ctx.asn = _asn_lookup
+    mock_reader_ctx.city = _city_lookup
+    mock_reader.__enter__ = lambda _: mock_reader_ctx
+    return mock_reader
+
+
+def mock_reader_city(ip):
+    '''
+    Must throw geoip2.errors.AddressNotFoundError when not in our mocked data
+    Must return
+    geoip2.models.City(['en'], continent={'code': 'EU', 'geoname_id': 6255148,
+    'names': {'de': 'Europa', 'en': 'Europe', 'es': 'Europa', 'fr': 'Europe', 'ja':
+    'ヨーロッパ', 'pt-BR': 'Europa', 'ru': 'Европа', 'zh-CN': '欧洲'}},
+    country={'geoname_id': 2750405, 'is_in_european_union': True, 'iso_code': 'NL',
+    'names': {'de': 'Niederlande', 'en': 'The Netherlands', 'es': 'Holanda', 'fr':
+    'Pays-Bas', 'ja': 'オランダ王国', 'pt-BR': 'Holanda', 'ru': 'Нидерланды',
+    'zh-CN': '荷兰'}}, registered_country={'geoname_id': 2750405,
+    'is_in_european_union': True, 'iso_code': 'NL', 'names': {'de': 'Niederlande',
+    'en': 'The Netherlands', 'es': 'Holanda', 'fr': 'Pays-Bas', 'ja':
+    'オランダ王国', 'pt-BR': 'Holanda', 'ru': 'Нидерланды', 'zh-CN': '荷兰'}},
+    traits={'ip_address': '2a02:898:96::5e8e:f508', 'network': '2a02:898::/32'},
+    city={'geoname_id': 2759794, 'names': {'de': 'Amsterdam', 'en': 'Amsterdam',
+    'es': 'Ámsterdam', 'fr': 'Amsterdam', 'ja': 'Amusuterudamu', 'pt-BR':
+    'Amesterdã', 'ru': 'Амстердам', 'zh-CN': '阿姆斯特丹'}},
+    location={'accuracy_radius': 20, 'latitude': 52.3759, 'longitude': 4.8975,
+    'time_zone': 'Europe/Amsterdam'}, postal={'code': '1012'},
+    subdivisions=[{'geoname_id': 2749879, 'iso_code': 'NH', 'names': {'de':
+    'Nordholland', 'en': 'North Holland', 'es': 'Holanda Septentrional', 'fr':
+    'Hollande-Septentrionale', 'ja': '
+    北ホラント州', 'pt-BR': 'Holanda do Norte', 'ru': 'Северная Голландия', 'zh-CN': '北荷兰省'}}])
+    geoip2.models.City(
+        locales: Optional[collections.abc.Sequence[str]],
+        *,
+        city: Optional[dict] = None,
+        continent: Optional[dict] = None,
+        country: Optional[dict] = None,
+        location: Optional[dict] = None,
+        ip_address: Union[str, ipaddress.IPv6Address, ipaddress.IPv4Address, NoneType] = None,
+        maxmind: Optional[dict] = None,
+        postal: Optional[dict] = None,
+        prefix_len: Optional[int] = None,
+        registered_country: Optional[dict] = None,
+        represented_country: Optional[dict] = None,
+        subdivisions: Optional[list[dict]] = None,
+        traits: Optional[dict] = None,
+        **_,
+    ) -> None
+    Docstring:      Model for the City Plus web service and the City database.
+    File:           /usr/local/lib/python3.11/site-packages/geoip2/models.py
+    Type:           ABCMeta
+    Subclasses:     Insights, Enterprise
+    '''
+    pass
+
+def mock_reader_asn():
+    '''
+    Must throw geoip2.errors.AddressNotFoundError when not in our mocked data
+    Must return
+    geoip2.models.ASN('2a02:898:96::5e8e:f508', autonomous_system_number=8283, autonomous_system_organization='Netwerkvereniging Coloclue', network='2a02:898::/32')  
+    Init signature:
+    geoip2.models.ASN(
+        ip_address: Union[str, ipaddress.IPv6Address, ipaddress.IPv4Address],
+        *,
+        autonomous_system_number: Optional[int] = None,
+        autonomous_system_organization: Optional[str] = None,
+        network: Optional[str] = None,
+        prefix_len: Optional[int] = None,
+        **_,
+    ) -> None
+    Docstring:      Model class for the GeoLite2 ASN.
+    File:           /usr/local/lib/python3.11/site-packages/geoip2/models.py
+    Type:           ABCMeta
+    Subclasses:     ISP
+
+    '''
+    pass
+
+
 def test_no_query():
     """Test searching without a query parameter"""
+    test_data = gen_testdata()
+
+    with patch('geoip2.database.Reader', return_value=get_mock_reader(test_data)):
 
         response = client.get("/")
 
@@ -37,6 +179,9 @@ def test_no_query():
 
 def test_single_query():
     """Test searching with an ip address"""
+    test_data = gen_testdata()
+
+    with patch('geoip2.database.Reader', return_value=get_mock_reader(test_data)):
         fake_ipv4 = fake.ipv4_public()
 
         response = client.get(f"/{fake_ipv4}")
@@ -50,6 +195,9 @@ def test_single_query():
 
 def test_multi_query():
     """Test searching with an ip address"""
+    test_data = gen_testdata()
+
+    with patch('geoip2.database.Reader', return_value=get_mock_reader(test_data)):
         fake_ips = [{'ip': fake.ipv6() if random.random() > 0.5 else fake.ipv4()}
                     for _ in range(16)]
 
@@ -67,6 +215,9 @@ def test_multi_query():
 
 def test_invalid_query():
     """Test searching with an invalid ip address"""
+    test_data = gen_testdata()
+
+    with patch('geoip2.database.Reader', return_value=get_mock_reader(test_data)):
         invalid_ip = '500.312.77.31337'
         test_pattern = 'Input is not a valid IPv[46] address'