forked from zaclys/searxng
283ae7bfad
* searx.network.client.LOOP is initialized in a thread * searx.network.__init__ imports LOOP which may happen before the thread has initialized LOOP This commit adds a new function "searx.network.client.get_loop()" to fix this issue
304 lines
11 KiB
Python
304 lines
11 KiB
Python
# SPDX-License-Identifier: AGPL-3.0-or-later
|
|
|
|
import atexit
|
|
import asyncio
|
|
import ipaddress
|
|
from itertools import cycle
|
|
|
|
import httpx
|
|
|
|
from .client import new_client, get_loop
|
|
|
|
|
|
DEFAULT_NAME = '__DEFAULT__'
|
|
NETWORKS = {}
|
|
# requests compatibility when reading proxy settings from settings.yml
|
|
PROXY_PATTERN_MAPPING = {
|
|
'http': 'http://',
|
|
'https': 'https://',
|
|
'socks4': 'socks4://',
|
|
'socks5': 'socks5://',
|
|
'socks5h': 'socks5h://',
|
|
'http:': 'http://',
|
|
'https:': 'https://',
|
|
'socks4:': 'socks4://',
|
|
'socks5:': 'socks5://',
|
|
'socks5h:': 'socks5h://',
|
|
}
|
|
|
|
ADDRESS_MAPPING = {
|
|
'ipv4': '0.0.0.0',
|
|
'ipv6': '::'
|
|
}
|
|
|
|
|
|
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_cycle', '_proxies_cycle', '_clients')
|
|
|
|
def __init__(self,
|
|
enable_http=True,
|
|
verify=True,
|
|
enable_http2=False,
|
|
max_connections=None,
|
|
max_keepalive_connections=None,
|
|
keepalive_expiry=None,
|
|
proxies=None,
|
|
local_addresses=None,
|
|
retries=0,
|
|
retry_on_http_error=None,
|
|
max_redirects=30):
|
|
self.enable_http = enable_http
|
|
self.verify = verify
|
|
self.enable_http2 = enable_http2
|
|
self.max_connections = max_connections
|
|
self.max_keepalive_connections = max_keepalive_connections
|
|
self.keepalive_expiry = keepalive_expiry
|
|
self.proxies = proxies
|
|
self.local_addresses = local_addresses
|
|
self.retries = retries
|
|
self.retry_on_http_error = retry_on_http_error
|
|
self.max_redirects = max_redirects
|
|
self._local_addresses_cycle = self.get_ipaddress_cycle()
|
|
self._proxies_cycle = self.get_proxy_cycles()
|
|
self._clients = {}
|
|
self.check_parameters()
|
|
|
|
def check_parameters(self):
|
|
for address in self.iter_ipaddresses():
|
|
if '/' in address:
|
|
ipaddress.ip_network(address, False)
|
|
else:
|
|
ipaddress.ip_address(address)
|
|
|
|
if self.proxies is not None and not isinstance(self.proxies, (str, dict)):
|
|
raise ValueError('proxies type has to be str, dict or None')
|
|
|
|
def iter_ipaddresses(self):
|
|
local_addresses = self.local_addresses
|
|
if not local_addresses:
|
|
return
|
|
elif isinstance(local_addresses, str):
|
|
local_addresses = [local_addresses]
|
|
for address in local_addresses:
|
|
yield address
|
|
|
|
def get_ipaddress_cycle(self):
|
|
while True:
|
|
count = 0
|
|
for address in self.iter_ipaddresses():
|
|
if '/' in address:
|
|
for a in ipaddress.ip_network(address, False).hosts():
|
|
yield str(a)
|
|
count += 1
|
|
else:
|
|
a = ipaddress.ip_address(address)
|
|
yield str(a)
|
|
count += 1
|
|
if count == 0:
|
|
yield None
|
|
|
|
def iter_proxies(self):
|
|
if not self.proxies:
|
|
return
|
|
# https://www.python-httpx.org/compatibility/#proxy-keys
|
|
if isinstance(self.proxies, str):
|
|
yield 'all://', [self.proxies]
|
|
else:
|
|
for pattern, proxy_url in self.proxies.items():
|
|
pattern = PROXY_PATTERN_MAPPING.get(pattern, pattern)
|
|
if isinstance(proxy_url, str):
|
|
proxy_url = [proxy_url]
|
|
yield pattern, proxy_url
|
|
|
|
def get_proxy_cycles(self):
|
|
proxy_settings = {}
|
|
for pattern, proxy_urls in self.iter_proxies():
|
|
proxy_settings[pattern] = cycle(proxy_urls)
|
|
while True:
|
|
yield tuple((pattern, next(proxy_url_cycle)) for pattern, proxy_url_cycle in proxy_settings.items())
|
|
|
|
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)
|
|
proxies = next(self._proxies_cycle) # is a tuple so it can be part of the key
|
|
key = (verify, max_redirects, local_address, proxies)
|
|
if key not in self._clients or self._clients[key].is_closed:
|
|
self._clients[key] = new_client(self.enable_http,
|
|
verify,
|
|
self.enable_http2,
|
|
self.max_connections,
|
|
self.max_keepalive_connections,
|
|
self.keepalive_expiry,
|
|
dict(proxies),
|
|
local_address,
|
|
0,
|
|
max_redirects)
|
|
return self._clients[key]
|
|
|
|
async def aclose(self):
|
|
async def close_client(client):
|
|
try:
|
|
await client.aclose()
|
|
except httpx.HTTPError:
|
|
pass
|
|
await asyncio.gather(*[close_client(client) for client in self._clients.values()], return_exceptions=False)
|
|
|
|
@staticmethod
|
|
def get_kwargs_clients(kwargs):
|
|
kwargs_clients = {}
|
|
if 'verify' in kwargs:
|
|
kwargs_clients['verify'] = kwargs.pop('verify')
|
|
if 'max_redirects' in kwargs:
|
|
kwargs_clients['max_redirects'] = kwargs.pop('max_redirects')
|
|
return kwargs_clients
|
|
|
|
def is_valid_respones(self, response):
|
|
if (self.retry_on_http_error is True and 400 <= response.status_code <= 599) \
|
|
or (isinstance(self.retry_on_http_error, list) and response.status_code in self.retry_on_http_error) \
|
|
or (isinstance(self.retry_on_http_error, int) and response.status_code == self.retry_on_http_error):
|
|
return False
|
|
return True
|
|
|
|
async def request(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)
|
|
try:
|
|
response = await client.request(method, url, **kwargs)
|
|
if self.is_valid_respones(response) or retries <= 0:
|
|
return response
|
|
except (httpx.RequestError, httpx.HTTPStatusError) as e:
|
|
if retries <= 0:
|
|
raise e
|
|
retries -= 1
|
|
|
|
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)
|
|
try:
|
|
response = client.stream(method, url, **kwargs)
|
|
if self.is_valid_respones(response) or retries <= 0:
|
|
return response
|
|
except (httpx.RequestError, httpx.HTTPStatusError) as e:
|
|
if retries <= 0:
|
|
raise e
|
|
retries -= 1
|
|
|
|
@classmethod
|
|
async def aclose_all(cls):
|
|
await asyncio.gather(*[network.aclose() for network in NETWORKS.values()], return_exceptions=False)
|
|
|
|
|
|
def get_network(name=None):
|
|
global NETWORKS
|
|
return NETWORKS.get(name or DEFAULT_NAME)
|
|
|
|
|
|
def initialize(settings_engines=None, settings_outgoing=None):
|
|
from searx.engines import engines
|
|
from searx import settings
|
|
|
|
global NETWORKS
|
|
|
|
settings_engines = settings_engines or settings.get('engines')
|
|
settings_outgoing = settings_outgoing or settings.get('outgoing')
|
|
|
|
# default parameters for AsyncHTTPTransport
|
|
# see https://github.com/encode/httpx/blob/e05a5372eb6172287458b37447c30f650047e1b8/httpx/_transports/default.py#L108-L121 # noqa
|
|
default_params = {
|
|
'enable_http': False,
|
|
'verify': True,
|
|
'enable_http2': settings_outgoing.get('enable_http2', True),
|
|
# Magic number kept from previous code
|
|
'max_connections': settings_outgoing.get('pool_connections', 100),
|
|
# Picked from constructor
|
|
'max_keepalive_connections': settings_outgoing.get('pool_maxsize', 10),
|
|
#
|
|
'keepalive_expiry': settings_outgoing.get('keepalive_expiry', 5.0),
|
|
'local_addresses': settings_outgoing.get('source_ips'),
|
|
'proxies': settings_outgoing.get('proxies'),
|
|
# default maximum redirect
|
|
# from https://github.com/psf/requests/blob/8c211a96cdbe9fe320d63d9e1ae15c5c07e179f8/requests/models.py#L55
|
|
'max_redirects': settings_outgoing.get('max_redirects', 30),
|
|
#
|
|
'retries': settings_outgoing.get('retries', 0),
|
|
'retry_on_http_error': None,
|
|
}
|
|
|
|
def new_network(params):
|
|
nonlocal default_params
|
|
result = {}
|
|
result.update(default_params)
|
|
result.update(params)
|
|
return Network(**result)
|
|
|
|
def iter_networks():
|
|
nonlocal settings_engines
|
|
for engine_spec in settings_engines:
|
|
engine_name = engine_spec['name']
|
|
engine = engines.get(engine_name)
|
|
if engine is None:
|
|
continue
|
|
network = getattr(engine, 'network', None)
|
|
yield engine_name, engine, network
|
|
|
|
if NETWORKS:
|
|
done()
|
|
NETWORKS.clear()
|
|
NETWORKS[DEFAULT_NAME] = new_network({})
|
|
NETWORKS['ipv4'] = new_network({'local_addresses': '0.0.0.0'})
|
|
NETWORKS['ipv6'] = new_network({'local_addresses': '::'})
|
|
|
|
# define networks from outgoing.networks
|
|
for network_name, network in settings_outgoing.get('networks', {}).items():
|
|
NETWORKS[network_name] = new_network(network)
|
|
|
|
# define networks from engines.[i].network (except references)
|
|
for engine_name, engine, network in iter_networks():
|
|
if network is None:
|
|
network = {}
|
|
for attribute_name, attribute_value in default_params.items():
|
|
if hasattr(engine, attribute_name):
|
|
network[attribute_name] = getattr(engine, attribute_name)
|
|
else:
|
|
network[attribute_name] = attribute_value
|
|
NETWORKS[engine_name] = new_network(network)
|
|
elif isinstance(network, dict):
|
|
NETWORKS[engine_name] = new_network(network)
|
|
|
|
# define networks from engines.[i].network (references)
|
|
for engine_name, engine, network in iter_networks():
|
|
if isinstance(network, str):
|
|
NETWORKS[engine_name] = NETWORKS[network]
|
|
|
|
|
|
@atexit.register
|
|
def done():
|
|
"""Close all HTTP client
|
|
|
|
Avoid a warning at exit
|
|
see https://github.com/encode/httpx/blob/1a6e254f72d9fd5694a1c10a28927e193ab4f76b/httpx/_client.py#L1785
|
|
|
|
Note: since Network.aclose has to be async, it is not possible to call this method on Network.__del__
|
|
So Network.aclose is called here using atexit.register
|
|
"""
|
|
try:
|
|
loop = get_loop()
|
|
if loop:
|
|
future = asyncio.run_coroutine_threadsafe(Network.aclose_all(), loop)
|
|
# wait 3 seconds to close the HTTP clients
|
|
future.result(3)
|
|
finally:
|
|
NETWORKS.clear()
|
|
|
|
|
|
NETWORKS[DEFAULT_NAME] = Network()
|