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Merge pull request #341 from dalf/verify_tor_on_start

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[enh] verify that Tor proxy works every time searx starts
This commit is contained in:
Alexandre Flament 2021-10-12 21:44:18 +02:00 committed by GitHub
commit b86aacdad6
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GPG key ID: 4AEE18F83AFDEB23
5 changed files with 70 additions and 22 deletions
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4
searx/network/__init__.py
View file

@ -12,7 +12,7 @@ import httpx
import anyio
import h2.exceptions
from .network import get_network, initialize
from .network import get_network, initialize, check_network_configuration
from .client import get_loop
from .raise_for_httperror import raise_for_httperror
@ -160,7 +160,7 @@ def delete(url, **kwargs):
async def stream_chunk_to_queue(network, queue, method, url, **kwargs):
try:
async with network.stream(method, url, **kwargs) as response:
async with await network.stream(method, url, **kwargs) as response:
queue.put(response)
# aiter_raw: access the raw bytes on the response without applying any HTTP content decoding
# https://www.python-httpx.org/quickstart/#streaming-responses

60
searx/network/network.py
View file

@ -11,7 +11,7 @@ from itertools import cycle
import httpx
from searx import logger, searx_debug
from .client import new_client, get_loop
from .client import new_client, get_loop, AsyncHTTPTransportNoHttp
logger = logger.getChild('network')
@ -42,10 +42,12 @@ class Network:
__slots__ = (
'enable_http', 'verify', 'enable_http2',
'max_connections', 'max_keepalive_connections', 'keepalive_expiry',
'local_addresses', 'proxies', 'max_redirects', 'retries', 'retry_on_http_error',
'local_addresses', 'proxies', 'using_tor_proxy', 'max_redirects', 'retries', 'retry_on_http_error',
'_local_addresses_cycle', '_proxies_cycle', '_clients', '_logger'
)
_TOR_CHECK_RESULT = {}
def __init__(
# pylint: disable=too-many-arguments
self,
@ -56,6 +58,7 @@ class Network:
max_keepalive_connections=None,
keepalive_expiry=None,
proxies=None,
using_tor_proxy=False,
local_addresses=None,
retries=0,
retry_on_http_error=None,
@ -69,6 +72,7 @@ class Network:
self.max_keepalive_connections = max_keepalive_connections
self.keepalive_expiry = keepalive_expiry
self.proxies = proxies
self.using_tor_proxy = using_tor_proxy
self.local_addresses = local_addresses
self.retries = retries
self.retry_on_http_error = retry_on_http_error
@ -144,7 +148,27 @@ class Network:
f'HTTP Request: {request.method} {request.url} "{response_line}"{content_type}'
)
def get_client(self, verify=None, max_redirects=None):
@staticmethod
async def check_tor_proxy(client: httpx.AsyncClient, proxies) -> bool:
if proxies in Network._TOR_CHECK_RESULT:
return Network._TOR_CHECK_RESULT[proxies]
result = True
# ignore client._transport because it is not used with all://
for transport in client._mounts.values(): # pylint: disable=protected-access
if isinstance(transport, AsyncHTTPTransportNoHttp):
continue
if not getattr(transport, '_rdns', False):
result = False
break
else:
response = await client.get('https://check.torproject.org/api/ip')
if not response.json()['IsTor']:
result = False
Network._TOR_CHECK_RESULT[proxies] = result
return result
async def get_client(self, verify=None, max_redirects=None):
verify = self.verify if verify is None else verify
max_redirects = self.max_redirects if max_redirects is None else max_redirects
local_address = next(self._local_addresses_cycle)
@ -152,7 +176,7 @@ class Network:
key = (verify, max_redirects, local_address, proxies)
hook_log_response = self.log_response if searx_debug else None
if key not in self._clients or self._clients[key].is_closed:
self._clients[key] = new_client(
client = new_client(
self.enable_http,
verify,
self.enable_http2,
@ -165,6 +189,10 @@ class Network:
max_redirects,
hook_log_response
)
if self.using_tor_proxy and not await self.check_tor_proxy(client, proxies):
await client.aclose()
raise httpx.ProxyError('Network configuration problem: not using Tor')
self._clients[key] = client
return self._clients[key]
async def aclose(self):
@ -197,7 +225,7 @@ class Network:
retries = self.retries
while retries >= 0: # pragma: no cover
kwargs_clients = Network.get_kwargs_clients(kwargs)
client = self.get_client(**kwargs_clients)
client = await self.get_client(**kwargs_clients)
try:
response = await client.request(method, url, **kwargs)
if self.is_valid_respones(response) or retries <= 0:
@ -207,11 +235,11 @@ class Network:
raise e
retries -= 1
def stream(self, method, url, **kwargs):
async def stream(self, method, url, **kwargs):
retries = self.retries
while retries >= 0: # pragma: no cover
kwargs_clients = Network.get_kwargs_clients(kwargs)
client = self.get_client(**kwargs_clients)
client = await self.get_client(**kwargs_clients)
try:
response = client.stream(method, url, **kwargs)
if self.is_valid_respones(response) or retries <= 0:
@ -230,6 +258,23 @@ def get_network(name=None):
return NETWORKS.get(name or DEFAULT_NAME)
def check_network_configuration():
async def check():
exception_count = 0
for network in NETWORKS.values():
if network.using_tor_proxy:
try:
await network.get_client()
except Exception: # pylint: disable=broad-except
network._logger.exception('Error') # pylint: disable=protected-access
exception_count += 1
return exception_count
future = asyncio.run_coroutine_threadsafe(check(), get_loop())
exception_count = future.result()
if exception_count > 0:
raise RuntimeError("Invalid network configuration")
def initialize(settings_engines=None, settings_outgoing=None):
# pylint: disable=import-outside-toplevel)
from searx.engines import engines
@ -249,6 +294,7 @@ def initialize(settings_engines=None, settings_outgoing=None):
'max_keepalive_connections': settings_outgoing['pool_maxsize'],
'keepalive_expiry': settings_outgoing['keepalive_expiry'],
'local_addresses': settings_outgoing['source_ips'],
'using_tor_proxy': settings_outgoing['using_tor_proxy'],
'proxies': settings_outgoing['proxies'],
'max_redirects': settings_outgoing['max_redirects'],
'retries': settings_outgoing['retries'],

6
searx/search/__init__.py
View file

@ -15,7 +15,7 @@ from searx import logger
from searx.plugins import plugins
from searx.search.models import EngineRef, SearchQuery
from searx.engines import load_engines
from searx.network import initialize as initialize_network
from searx.network import initialize as initialize_network, check_network_configuration
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
@ -24,10 +24,12 @@ from searx.search.checker import initialize as initialize_checker
logger = logger.getChild('search')
def initialize(settings_engines=None, enable_checker=False):
def initialize(settings_engines=None, enable_checker=False, check_network=False):
settings_engines = settings_engines or settings['engines']
load_engines(settings_engines)
initialize_network(settings_engines, settings['outgoing'])
if check_network:
check_network_configuration()
initialize_metrics([engine['name'] for engine in settings_engines])
initialize_processors(settings_engines)
if enable_checker:

2
searx/webapp.py
View file

@ -1350,7 +1350,7 @@ if (not werkzeug_reloader
or (werkzeug_reloader
and os.environ.get("WERKZEUG_RUN_MAIN") == "true") ):
plugin_initialize(app)
search_initialize(enable_checker=True)
search_initialize(enable_checker=True, check_network=True)
def run():

20
tests/unit/network/test_network.py
View file

@ -90,12 +90,12 @@ class TestNetwork(SearxTestCase):
async def test_get_client(self):
network = Network(verify=True)
client1 = network.get_client()
client2 = network.get_client(verify=True)
client3 = network.get_client(max_redirects=10)
client4 = network.get_client(verify=True)
client5 = network.get_client(verify=False)
client6 = network.get_client(max_redirects=10)
client1 = await network.get_client()
client2 = await network.get_client(verify=True)
client3 = await network.get_client(max_redirects=10)
client4 = await network.get_client(verify=True)
client5 = await network.get_client(verify=False)
client6 = await network.get_client(max_redirects=10)
self.assertEqual(client1, client2)
self.assertEqual(client1, client4)
@ -107,7 +107,7 @@ class TestNetwork(SearxTestCase):
async def test_aclose(self):
network = Network(verify=True)
network.get_client()
await network.get_client()
await network.aclose()
async def test_request(self):
@ -211,7 +211,7 @@ class TestNetworkStreamRetries(SearxTestCase):
async def test_retries_ok(self):
with patch.object(httpx.AsyncClient, 'stream', new=TestNetworkStreamRetries.get_response_exception_then_200()):
network = Network(enable_http=True, retries=1, retry_on_http_error=403)
response = network.stream('GET', 'https://example.com/')
response = await network.stream('GET', 'https://example.com/')
self.assertEqual(response.text, TestNetworkStreamRetries.TEXT)
await network.aclose()
@ -219,7 +219,7 @@ class TestNetworkStreamRetries(SearxTestCase):
with patch.object(httpx.AsyncClient, 'stream', new=TestNetworkStreamRetries.get_response_exception_then_200()):
network = Network(enable_http=True, retries=0, retry_on_http_error=403)
with self.assertRaises(httpx.RequestError):
network.stream('GET', 'https://example.com/')
await network.stream('GET', 'https://example.com/')
await network.aclose()
async def test_retries_exception(self):
@ -234,6 +234,6 @@ class TestNetworkStreamRetries(SearxTestCase):
with patch.object(httpx.AsyncClient, 'stream', new=stream):
network = Network(enable_http=True, retries=0, retry_on_http_error=403)
response = network.stream('GET', 'https://example.com/')
response = await network.stream('GET', 'https://example.com/')
self.assertEqual(response.status_code, 403)
await network.aclose()