mirror of
https://github.com/searxng/searxng.git
synced 2024-12-24 10:10:29 +00:00
251 lines
8.6 KiB
Python
251 lines
8.6 KiB
Python
# SPDX-License-Identifier: AGPL-3.0-or-later
|
|
# lint: pylint
|
|
# pylint: disable=missing-module-docstring, missing-function-docstring, global-statement
|
|
|
|
import asyncio
|
|
import logging
|
|
import threading
|
|
import httpcore
|
|
import httpx
|
|
from httpx_socks import AsyncProxyTransport
|
|
from python_socks import (
|
|
parse_proxy_url,
|
|
ProxyConnectionError,
|
|
ProxyTimeoutError,
|
|
ProxyError
|
|
)
|
|
|
|
from searx import logger
|
|
|
|
# Optional uvloop (support Python 3.6)
|
|
try:
|
|
import uvloop
|
|
except ImportError:
|
|
pass
|
|
else:
|
|
uvloop.install()
|
|
|
|
|
|
logger = logger.getChild('searx.http.client')
|
|
LOOP = None
|
|
SSLCONTEXTS = {}
|
|
TRANSPORT_KWARGS = {
|
|
'backend': 'asyncio',
|
|
'trust_env': False,
|
|
}
|
|
|
|
|
|
# pylint: disable=protected-access
|
|
async def close_connections_for_url(
|
|
connection_pool: httpcore.AsyncConnectionPool,
|
|
url: httpcore._utils.URL ):
|
|
|
|
origin = httpcore._utils.url_to_origin(url)
|
|
logger.debug('Drop connections for %r', origin)
|
|
connections_to_close = connection_pool._connections_for_origin(origin)
|
|
for connection in connections_to_close:
|
|
await connection_pool._remove_from_pool(connection)
|
|
try:
|
|
await connection.aclose()
|
|
except httpcore.NetworkError as e:
|
|
logger.warning('Error closing an existing connection', exc_info=e)
|
|
# pylint: enable=protected-access
|
|
|
|
|
|
def get_sslcontexts(proxy_url=None, cert=None, verify=True, trust_env=True, http2=False):
|
|
global SSLCONTEXTS
|
|
key = (proxy_url, cert, verify, trust_env, http2)
|
|
if key not in SSLCONTEXTS:
|
|
SSLCONTEXTS[key] = httpx.create_ssl_context(cert, verify, trust_env, http2)
|
|
return SSLCONTEXTS[key]
|
|
|
|
|
|
class AsyncHTTPTransportNoHttp(httpcore.AsyncHTTPTransport):
|
|
"""Block HTTP request"""
|
|
|
|
async def arequest(self, method, url, headers=None, stream=None, ext=None):
|
|
raise httpcore.UnsupportedProtocol("HTTP protocol is disabled")
|
|
|
|
|
|
class AsyncProxyTransportFixed(AsyncProxyTransport):
|
|
"""Fix httpx_socks.AsyncProxyTransport
|
|
|
|
Map python_socks exceptions to httpcore.ProxyError
|
|
|
|
Map socket.gaierror to httpcore.ConnectError
|
|
|
|
Note: keepalive_expiry is ignored, AsyncProxyTransport should call:
|
|
* self._keepalive_sweep()
|
|
* self._response_closed(self, connection)
|
|
|
|
Note: AsyncProxyTransport inherit from AsyncConnectionPool
|
|
|
|
Note: the API is going to change on httpx 0.18.0
|
|
see https://github.com/encode/httpx/pull/1522
|
|
"""
|
|
|
|
async def arequest(self, method, url, headers=None, stream=None, ext=None):
|
|
retry = 2
|
|
while retry > 0:
|
|
retry -= 1
|
|
try:
|
|
return await super().arequest(method, url, headers, stream, ext)
|
|
except (ProxyConnectionError, ProxyTimeoutError, ProxyError) as e:
|
|
raise httpcore.ProxyError(e)
|
|
except OSError as e:
|
|
# socket.gaierror when DNS resolution fails
|
|
raise httpcore.NetworkError(e)
|
|
except httpcore.RemoteProtocolError as e:
|
|
# in case of httpcore.RemoteProtocolError: Server disconnected
|
|
await close_connections_for_url(self, url)
|
|
logger.warning('httpcore.RemoteProtocolError: retry', exc_info=e)
|
|
# retry
|
|
except (httpcore.NetworkError, httpcore.ProtocolError) as e:
|
|
# httpcore.WriteError on HTTP/2 connection leaves a new opened stream
|
|
# then each new request creates a new stream and raise the same WriteError
|
|
await close_connections_for_url(self, url)
|
|
raise e
|
|
|
|
|
|
class AsyncHTTPTransportFixed(httpx.AsyncHTTPTransport):
|
|
"""Fix httpx.AsyncHTTPTransport"""
|
|
|
|
async def arequest(self, method, url, headers=None, stream=None, ext=None):
|
|
retry = 2
|
|
while retry > 0:
|
|
retry -= 1
|
|
try:
|
|
return await super().arequest(method, url, headers, stream, ext)
|
|
except OSError as e:
|
|
# socket.gaierror when DNS resolution fails
|
|
raise httpcore.ConnectError(e)
|
|
except httpcore.CloseError as e:
|
|
# httpcore.CloseError: [Errno 104] Connection reset by peer
|
|
# raised by _keepalive_sweep()
|
|
# from https://github.com/encode/httpcore/blob/4b662b5c42378a61e54d673b4c949420102379f5/httpcore/_backends/asyncio.py#L198 # pylint: disable=line-too-long
|
|
await close_connections_for_url(self._pool, url)
|
|
logger.warning('httpcore.CloseError: retry', exc_info=e)
|
|
# retry
|
|
except httpcore.RemoteProtocolError as e:
|
|
# in case of httpcore.RemoteProtocolError: Server disconnected
|
|
await close_connections_for_url(self._pool, url)
|
|
logger.warning('httpcore.RemoteProtocolError: retry', exc_info=e)
|
|
# retry
|
|
except (httpcore.ProtocolError, httpcore.NetworkError) as e:
|
|
await close_connections_for_url(self._pool, url)
|
|
raise e
|
|
|
|
|
|
def get_transport_for_socks_proxy(verify, http2, local_address, proxy_url, limit, retries):
|
|
global TRANSPORT_KWARGS
|
|
# support socks5h (requests compatibility):
|
|
# https://requests.readthedocs.io/en/master/user/advanced/#socks
|
|
# socks5:// hostname is resolved on client side
|
|
# socks5h:// hostname is resolved on proxy side
|
|
rdns = False
|
|
socks5h = 'socks5h://'
|
|
if proxy_url.startswith(socks5h):
|
|
proxy_url = 'socks5://' + proxy_url[len(socks5h):]
|
|
rdns = True
|
|
|
|
proxy_type, proxy_host, proxy_port, proxy_username, proxy_password = parse_proxy_url(proxy_url)
|
|
verify = get_sslcontexts(proxy_url, None, True, False, http2) if verify is True else verify
|
|
return AsyncProxyTransportFixed(
|
|
proxy_type=proxy_type, proxy_host=proxy_host, proxy_port=proxy_port,
|
|
username=proxy_username, password=proxy_password,
|
|
rdns=rdns,
|
|
loop=get_loop(),
|
|
verify=verify,
|
|
http2=http2,
|
|
local_address=local_address,
|
|
max_connections=limit.max_connections,
|
|
max_keepalive_connections=limit.max_keepalive_connections,
|
|
keepalive_expiry=limit.keepalive_expiry,
|
|
retries=retries,
|
|
**TRANSPORT_KWARGS
|
|
)
|
|
|
|
|
|
def get_transport(verify, http2, local_address, proxy_url, limit, retries):
|
|
global TRANSPORT_KWARGS
|
|
verify = get_sslcontexts(None, None, True, False, http2) if verify is True else verify
|
|
return AsyncHTTPTransportFixed(
|
|
# pylint: disable=protected-access
|
|
verify=verify,
|
|
http2=http2,
|
|
local_address=local_address,
|
|
proxy=httpx._config.Proxy(proxy_url) if proxy_url else None,
|
|
limits=limit,
|
|
retries=retries,
|
|
**TRANSPORT_KWARGS
|
|
)
|
|
|
|
|
|
def iter_proxies(proxies):
|
|
# https://www.python-httpx.org/compatibility/#proxy-keys
|
|
if isinstance(proxies, str):
|
|
yield 'all://', proxies
|
|
elif isinstance(proxies, dict):
|
|
for pattern, proxy_url in proxies.items():
|
|
yield pattern, proxy_url
|
|
|
|
|
|
def new_client(
|
|
# pylint: disable=too-many-arguments
|
|
enable_http, verify, enable_http2,
|
|
max_connections, max_keepalive_connections, keepalive_expiry,
|
|
proxies, local_address, retries, max_redirects ):
|
|
limit = httpx.Limits(
|
|
max_connections=max_connections,
|
|
max_keepalive_connections=max_keepalive_connections,
|
|
keepalive_expiry=keepalive_expiry
|
|
)
|
|
# See https://www.python-httpx.org/advanced/#routing
|
|
mounts = {}
|
|
for pattern, proxy_url in iter_proxies(proxies):
|
|
if not enable_http and (pattern == 'http' or pattern.startswith('http://')):
|
|
continue
|
|
if (proxy_url.startswith('socks4://')
|
|
or proxy_url.startswith('socks5://')
|
|
or proxy_url.startswith('socks5h://')
|
|
):
|
|
mounts[pattern] = get_transport_for_socks_proxy(
|
|
verify, enable_http2, local_address, proxy_url, limit, retries
|
|
)
|
|
else:
|
|
mounts[pattern] = get_transport(
|
|
verify, enable_http2, local_address, proxy_url, limit, retries
|
|
)
|
|
|
|
if not enable_http:
|
|
mounts['http://'] = AsyncHTTPTransportNoHttp()
|
|
|
|
transport = get_transport(verify, enable_http2, local_address, None, limit, retries)
|
|
return httpx.AsyncClient(transport=transport, mounts=mounts, max_redirects=max_redirects)
|
|
|
|
|
|
def get_loop():
|
|
global LOOP
|
|
return LOOP
|
|
|
|
|
|
def init():
|
|
# log
|
|
for logger_name in ('hpack.hpack', 'hpack.table'):
|
|
logging.getLogger(logger_name).setLevel(logging.WARNING)
|
|
|
|
# loop
|
|
def loop_thread():
|
|
global LOOP
|
|
LOOP = asyncio.new_event_loop()
|
|
LOOP.run_forever()
|
|
|
|
thread = threading.Thread(
|
|
target=loop_thread,
|
|
name='asyncio_loop',
|
|
daemon=True,
|
|
)
|
|
thread.start()
|
|
|
|
|
|
init()
|