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# SPDX-License-Identifier: AGPL-3.0-or-later
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# lint: pylint
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# pylint: disable=missing-module-docstring, global-statement
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import asyncio
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import logging
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import threading
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import httpcore
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import httpx
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from httpx_socks import AsyncProxyTransport
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from python_socks import (
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parse_proxy_url,
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ProxyConnectionError,
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ProxyTimeoutError,
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ProxyError
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)
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from searx import logger
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# Optional uvloop (support Python 3.6)
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try:
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import uvloop
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except ImportError:
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pass
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else:
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uvloop.install()
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logger = logger.getChild('searx.network.client')
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LOOP = None
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SSLCONTEXTS = {}
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TRANSPORT_KWARGS = {
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# use anyio :
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# * https://github.com/encode/httpcore/issues/344
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# * https://github.com/encode/httpx/discussions/1511
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'backend': 'anyio',
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'trust_env': False,
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}
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# pylint: disable=protected-access
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async def close_connections_for_url(
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connection_pool: httpcore.AsyncConnectionPool, url: httpcore._utils.URL
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):
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origin = httpcore._utils.url_to_origin(url)
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logger.debug('Drop connections for %r', origin)
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connections_to_close = connection_pool._connections_for_origin(origin)
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for connection in connections_to_close:
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await connection_pool._remove_from_pool(connection)
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try:
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await connection.aclose()
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except httpx.NetworkError as e:
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logger.warning('Error closing an existing connection', exc_info=e)
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# pylint: enable=protected-access
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def get_sslcontexts(proxy_url=None, cert=None, verify=True, trust_env=True, http2=False):
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key = (proxy_url, cert, verify, trust_env, http2)
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if key not in SSLCONTEXTS:
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SSLCONTEXTS[key] = httpx.create_ssl_context(cert, verify, trust_env, http2)
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return SSLCONTEXTS[key]
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class AsyncHTTPTransportNoHttp(httpx.AsyncHTTPTransport):
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"""Block HTTP request"""
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async def handle_async_request(
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self, method, url, headers=None, stream=None, extensions=None
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):
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raise httpx.UnsupportedProtocol('HTTP protocol is disabled')
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class AsyncProxyTransportFixed(AsyncProxyTransport):
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"""Fix httpx_socks.AsyncProxyTransport
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Map python_socks exceptions to httpx.ProxyError / httpx.ConnectError
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Map socket.gaierror to httpx.ConnectError
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Note: AsyncProxyTransport inherit from AsyncConnectionPool
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"""
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async def handle_async_request(
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self, method, url, headers=None, stream=None, extensions=None
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):
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retry = 2
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while retry > 0:
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retry -= 1
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try:
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return await super().handle_async_request(
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method, url, headers=headers, stream=stream, extensions=extensions
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)
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except (ProxyConnectionError, ProxyTimeoutError, ProxyError) as e:
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raise httpx.ProxyError from e
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except OSError as e:
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# socket.gaierror when DNS resolution fails
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raise httpx.ConnectError from e
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except httpx.NetworkError as e:
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# httpx.WriteError on HTTP/2 connection leaves a new opened stream
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# then each new request creates a new stream and raise the same WriteError
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await close_connections_for_url(self, url)
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raise e
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except httpx.RemoteProtocolError as e:
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# in case of httpx.RemoteProtocolError: Server disconnected
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await close_connections_for_url(self, url)
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logger.warning('httpx.RemoteProtocolError: retry', exc_info=e)
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# retry
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class AsyncHTTPTransportFixed(httpx.AsyncHTTPTransport):
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"""Fix httpx.AsyncHTTPTransport"""
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async def handle_async_request(
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self, method, url, headers=None, stream=None, extensions=None
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):
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retry = 2
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while retry > 0:
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retry -= 1
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try:
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return await super().handle_async_request(
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method, url, headers=headers, stream=stream, extensions=extensions
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)
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except OSError as e:
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# socket.gaierror when DNS resolution fails
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raise httpx.ConnectError from e
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except httpx.NetworkError as e:
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# httpx.WriteError on HTTP/2 connection leaves a new opened stream
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# then each new request creates a new stream and raise the same WriteError
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await close_connections_for_url(self._pool, url)
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raise e
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except httpx.RemoteProtocolError as e:
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# in case of httpx.RemoteProtocolError: Server disconnected
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await close_connections_for_url(self._pool, url)
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logger.warning('httpx.RemoteProtocolError: retry', exc_info=e)
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# retry
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def get_transport_for_socks_proxy(verify, http2, local_address, proxy_url, limit, retries):
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# support socks5h (requests compatibility):
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# https://requests.readthedocs.io/en/master/user/advanced/#socks
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# socks5:// hostname is resolved on client side
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# socks5h:// hostname is resolved on proxy side
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rdns = False
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socks5h = 'socks5h://'
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if proxy_url.startswith(socks5h):
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proxy_url = 'socks5://' + proxy_url[len(socks5h):]
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rdns = True
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proxy_type, proxy_host, proxy_port, proxy_username, proxy_password = parse_proxy_url(proxy_url)
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verify = get_sslcontexts(proxy_url, None, True, False, http2) if verify is True else verify
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return AsyncProxyTransportFixed(
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proxy_type=proxy_type, proxy_host=proxy_host, proxy_port=proxy_port,
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username=proxy_username, password=proxy_password,
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rdns=rdns,
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loop=get_loop(),
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verify=verify,
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http2=http2,
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local_address=local_address,
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max_connections=limit.max_connections,
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max_keepalive_connections=limit.max_keepalive_connections,
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keepalive_expiry=limit.keepalive_expiry,
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retries=retries,
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**TRANSPORT_KWARGS
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)
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def get_transport(verify, http2, local_address, proxy_url, limit, retries):
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verify = get_sslcontexts(None, None, True, False, http2) if verify is True else verify
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return AsyncHTTPTransportFixed(
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# pylint: disable=protected-access
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verify=verify,
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http2=http2,
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local_address=local_address,
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proxy=httpx._config.Proxy(proxy_url) if proxy_url else None,
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limits=limit,
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retries=retries,
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**TRANSPORT_KWARGS
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)
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def new_client(
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# pylint: disable=too-many-arguments
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enable_http, verify, enable_http2,
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max_connections, max_keepalive_connections, keepalive_expiry,
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proxies, local_address, retries, max_redirects, hook_log_response ):
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limit = httpx.Limits(
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max_connections=max_connections,
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max_keepalive_connections=max_keepalive_connections,
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keepalive_expiry=keepalive_expiry
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)
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# See https://www.python-httpx.org/advanced/#routing
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mounts = {}
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for pattern, proxy_url in proxies.items():
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if not enable_http and pattern.startswith('http://'):
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continue
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if (proxy_url.startswith('socks4://')
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or proxy_url.startswith('socks5://')
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or proxy_url.startswith('socks5h://')
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):
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mounts[pattern] = get_transport_for_socks_proxy(
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verify, enable_http2, local_address, proxy_url, limit, retries
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)
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else:
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mounts[pattern] = get_transport(
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verify, enable_http2, local_address, proxy_url, limit, retries
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)
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if not enable_http:
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mounts['http://'] = AsyncHTTPTransportNoHttp()
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transport = get_transport(verify, enable_http2, local_address, None, limit, retries)
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event_hooks = None
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if hook_log_response:
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event_hooks = {'response': [ hook_log_response ]}
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return httpx.AsyncClient(
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transport=transport,
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mounts=mounts,
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max_redirects=max_redirects,
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event_hooks=event_hooks,
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)
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def get_loop():
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return LOOP
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def init():
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# log
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for logger_name in ('hpack.hpack', 'hpack.table', 'httpx._client'):
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logging.getLogger(logger_name).setLevel(logging.WARNING)
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# loop
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def loop_thread():
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global LOOP
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LOOP = asyncio.new_event_loop()
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LOOP.run_forever()
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thread = threading.Thread(
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target=loop_thread,
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name='asyncio_loop',
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daemon=True,
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)
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thread.start()
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init()
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