mirror of
https://github.com/kennethreitz/requests3.git
synced 2026-06-05 23:10:16 +00:00
661 lines
25 KiB
Python
661 lines
25 KiB
Python
# -*- coding: utf-8 -*-
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"""
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requests.adapters
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~~~~~~~~~~~~~~~~~
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This module contains the transport adapters that Requests uses to define
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and maintain connections.
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"""
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import os.path
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import socket
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from . import core
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from .http_models import Response, AsyncResponse
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from ._basics import urlparse, basestring
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from .http_utils import (
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DEFAULT_CA_BUNDLE_PATH,
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get_encoding_from_headers,
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prepend_scheme_if_needed,
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get_auth_from_url,
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urldefragauth,
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select_proxy,
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)
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from ._structures import HTTPHeaderDict
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from .http_cookies import extract_cookies_to_jar
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from .exceptions import (
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ConnectionError,
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ConnectTimeout,
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ReadTimeout,
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SSLError,
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ProxyError,
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RetryError,
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InvalidScheme,
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)
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from .http_auth import _basic_auth_str
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try:
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from .core._http.contrib.socks import SOCKSProxyManager
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except ImportError:
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def SOCKSProxyManager(*args, **kwargs):
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raise InvalidScheme("Missing dependencies for SOCKS support.")
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DEFAULT_POOLBLOCK = False
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DEFAULT_POOLSIZE = 10
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DEFAULT_RETRIES = 0
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DEFAULT_POOL_TIMEOUT = None
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def _pool_kwargs(verify, cert):
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"""Create a dictionary of keyword arguments to pass to a
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:class:`PoolManager <urllib3.poolmanager.PoolManager>` with the
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necessary SSL configuration.
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:param verify: Whether we should actually verify the certificate;
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optionally a path to a CA certificate bundle or
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directory of CA certificates.
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:param cert: The path to the client certificate and key, if any.
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This can either be the path to the certificate and
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key concatenated in a single file, or as a tuple of
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(cert_file, key_file).
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"""
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pool_kwargs = {}
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if verify:
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cert_loc = None
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# Allow self-specified cert location.
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if verify is not True:
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cert_loc = verify
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if not cert_loc:
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cert_loc = DEFAULT_CA_BUNDLE_PATH
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if not cert_loc or not os.path.exists(cert_loc):
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raise IOError(
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"Could not find a suitable TLS CA certificate bundle, "
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"invalid path: {0}".format(cert_loc)
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)
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pool_kwargs["cert_reqs"] = "CERT_REQUIRED"
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if not os.path.isdir(cert_loc):
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pool_kwargs["ca_certs"] = cert_loc
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pool_kwargs["ca_cert_dir"] = None
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else:
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pool_kwargs["ca_cert_dir"] = cert_loc
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pool_kwargs["ca_certs"] = None
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else:
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pool_kwargs["cert_reqs"] = "CERT_NONE"
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pool_kwargs["ca_certs"] = None
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pool_kwargs["ca_cert_dir"] = None
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if cert:
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if not isinstance(cert, basestring):
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pool_kwargs["cert_file"] = cert[0]
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pool_kwargs["key_file"] = cert[1]
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else:
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pool_kwargs["cert_file"] = cert
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pool_kwargs["key_file"] = None
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cert_file = pool_kwargs["cert_file"]
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key_file = pool_kwargs["key_file"]
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if cert_file and not os.path.exists(cert_file):
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raise IOError(
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"Could not find the TLS certificate file, "
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"invalid path: {0}".format(cert_file)
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)
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if key_file and not os.path.exists(key_file):
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raise IOError(
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"Could not find the TLS key file, "
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"invalid path: {0}".format(key_file)
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)
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return pool_kwargs
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class BaseAdapter(object):
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"""The Base Transport Adapter"""
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def __init__(self):
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super(BaseAdapter, self).__init__()
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def send(
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self,
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request,
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stream=False,
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timeout=None,
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verify=True,
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cert=None,
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proxies=None,
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):
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"""Sends PreparedRequest object. Returns Response object.
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:param request: The :class:`PreparedRequest <PreparedRequest>` being sent.
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:param stream: (optional) Whether to stream the request content.
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:param timeout: (optional) How long to wait for the server to send
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data before giving up, as a float, or a :ref:`(connect timeout,
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read timeout) <timeouts>` tuple.
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:type timeout: float or tuple
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:param verify: (optional) Either a boolean, in which case it controls whether we verify
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the server's TLS certificate, or a string, in which case it must be a path
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to a CA bundle to use
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:param cert: (optional) Any user-provided SSL certificate to be trusted.
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:param proxies: (optional) The proxies dictionary to apply to the request.
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"""
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raise NotImplementedError
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def close(self):
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"""Cleans up adapter specific items."""
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raise NotImplementedError
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class HTTPAdapter(BaseAdapter):
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"""The built-in HTTP Adapter for urllib3.
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Provides a general-case interface for Requests sessions to contact HTTP and
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HTTPS urls by implementing the Transport Adapter interface. This class will
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usually be created by the :class:`Session <Session>` class under the
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covers.
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:param pool_connections: The number of urllib3 connection pools to cache.
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:param pool_maxsize: The maximum number of connections to save in the pool.
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:param max_retries: The maximum number of retries each connection
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should attempt. Note, this applies only to failed DNS lookups, socket
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connections and connection timeouts, never to requests where data has
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made it to the server. By default, Requests does not retry failed
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connections. If you need granular control over the conditions under
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which we retry a request, import urllib3's ``Retry`` class and pass
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that instead.
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:param pool_block: Whether the connection pool should block for connections.
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Usage::
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>>> import requests
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>>> s = requests.Session()
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>>> a = requests.adapters.HTTPAdapter(max_retries=3)
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>>> s.mount('http://', a)
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"""
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__attrs__ = [
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"max_retries",
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"config",
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"_pool_connections",
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"_pool_maxsize",
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"_pool_block",
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]
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def __init__(self):
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super(HTTPAdapter, self).__init__()
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self.client = core.http3.Client()
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def __getstate__(self):
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return {attr: getattr(self, attr, None) for attr in self.__attrs__}
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def __setstate__(self, state):
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# Can't handle by adding 'proxy_manager' to self.__attrs__ because
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# self.poolmanager uses a lambda function, which isn't pickleable.
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self.proxy_manager = {}
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self.config = {}
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for attr, value in state.items():
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setattr(self, attr, value)
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self.init_poolmanager(
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self._pool_connections, self._pool_maxsize, block=self._pool_block
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)
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def build_response(self, req, resp):
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"""Builds a :class:`Response <requests.Response>` object from a urllib3
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response. This should not be called from user code, and is only exposed
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for use when subclassing the
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:class:`HTTPAdapter <requests.adapters.HTTPAdapter>`
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:param req: The :class:`PreparedRequest <PreparedRequest>` used to generate the response.
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:param resp: The urllib3 response object.
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:rtype: requests.Response
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"""
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response = Response()
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# Fallback to None if there's no status_code, for whatever reason.
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response.status_code = getattr(resp, "status_code", None)
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# Make headers case-insensitive.
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response.headers = HTTPHeaderDict(getattr(resp, "headers", {}))
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# Set encoding.
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response.encoding = get_encoding_from_headers(response.headers)
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response.raw = resp
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response.reason = getattr(resp, "reason_phrase", None)
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if isinstance(req.url, bytes):
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response.url = req.url.decode("utf-8")
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else:
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response.url = req.url
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# Add new cookies from the server.
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extract_cookies_to_jar(response.cookies, req, resp)
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# Give the Response some context.
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response.request = req
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response.connection = self
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return response
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def request_url(self, request, proxies):
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"""Obtain the url to use when making the final request.
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If the message is being sent through a HTTP proxy, the full URL has to
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be used. Otherwise, we should only use the path portion of the URL.
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This should not be called from user code, and is only exposed for use
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when subclassing the
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:class:`HTTPAdapter <requests.adapters.HTTPAdapter>`.
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:param request: The :class:`PreparedRequest <PreparedRequest>` being sent.
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:param proxies: A dictionary of schemes or schemes and hosts to proxy URLs.
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:rtype: str
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"""
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# proxy = select_proxy(request.url, proxies)
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# scheme = urlparse(request.url).scheme
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# is_proxied_http_request = proxy and scheme != "https"
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# using_socks_proxy = False
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# if proxy:
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# proxy_scheme = urlparse(proxy).scheme.lower()
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# using_socks_proxy = proxy_scheme.startswith("socks")
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# url = request.path_url
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# if is_proxied_http_request and not using_socks_proxy:
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# url = urldefragauth(request.url)
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# return url
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return request.url
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def add_headers(self, request, **kwargs):
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"""Add any headers needed by the connection. As of v2.0 this does
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nothing by default, but is left for overriding by users that subclass
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the :class:`HTTPAdapter <requests.adapters.HTTPAdapter>`.
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This should not be called from user code, and is only exposed for use
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when subclassing the
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:class:`HTTPAdapter <requests.adapters.HTTPAdapter>`.
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:param request: The :class:`PreparedRequest <PreparedRequest>` to add headers to.
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:param kwargs: The keyword arguments from the call to send().
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"""
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pass
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def proxy_headers(self, proxy):
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"""Returns a dictionary of the headers to add to any request sent
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through a proxy. This works with urllib3 magic to ensure that they are
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correctly sent to the proxy, rather than in a tunnelled request if
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CONNECT is being used.
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This should not be called from user code, and is only exposed for use
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when subclassing the
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:class:`HTTPAdapter <requests.adapters.HTTPAdapter>`.
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:param proxies: The url of the proxy being used for this request.
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:rtype: dict
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"""
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headers = {}
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username, password = get_auth_from_url(proxy)
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if username:
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headers["Proxy-Authorization"] = _basic_auth_str(
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username, password
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)
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return headers
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def send(
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self,
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request,
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stream=False,
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timeout=None,
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verify=True,
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cert=None,
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proxies=None,
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):
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"""Sends PreparedRequest object. Returns Response object.
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:param request: The :class:`PreparedRequest <PreparedRequest>` being sent.
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:param stream: (optional) Whether to stream the request content.
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:param timeout: (optional) How long to wait for the server to send
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data before giving up, as a float, or a :ref:`(connect timeout,
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read timeout) <timeouts>` tuple.
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:type timeout: float or tuple or urllib3 Timeout object
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:param verify: (optional) Either a boolean, in which case it controls whether
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we verify the server's TLS certificate, or a string, in which case it
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must be a path to a CA bundle to use
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:param cert: (optional) Any user-provided SSL certificate to be trusted.
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:param proxies: (optional) The proxies dictionary to apply to the request.
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:rtype: requests.Response
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"""
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url = self.request_url(request, proxies)
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self.add_headers(request)
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chunked = not (
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request.body is None or "Content-Length" in request.headers
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)
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if isinstance(timeout, tuple):
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try:
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connect, read = timeout
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except ValueError as e:
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# this may raise a string formatting error.
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err = (
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"Invalid timeout {0}. Pass a (connect, read) "
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"timeout tuple, or a single float to set "
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"both timeouts to the same value".format(timeout)
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)
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raise ValueError(err)
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try:
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if not chunked:
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resp = core.blocking_request(
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method=request.method,
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url=url,
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data=request.body,
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headers=[(k, request.headers[k]) for k in request.headers],
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# redirect=False,
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# assert_same_host=False,
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# stream=False,
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# decode_content=False,
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# retries=self.max_retries,
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timeout=timeout,
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# enforce_content_length=True,
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client=self.client,
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)
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# Send the request.
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else:
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if hasattr(conn, "proxy_pool"):
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conn = conn.proxy_pool
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low_conn = conn._get_conn(timeout=DEFAULT_POOL_TIMEOUT)
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try:
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low_conn.putrequest(
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request.method, url, skip_accept_encoding=True
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)
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for header, value in request.headers.items():
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low_conn.putheader(header, value)
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low_conn.endheaders()
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for i in request.body:
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chunk_size = len(i)
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if chunk_size == 0:
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continue
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low_conn.send(hex(chunk_size)[2:].encode("utf-8"))
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low_conn.send(b"\r\n")
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low_conn.send(i)
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low_conn.send(b"\r\n")
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low_conn.send(b"0\r\n\r\n")
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# Receive the response from the server
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try:
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# For Python 2.7, use buffering of HTTP responses
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r = low_conn.getresponse(buffering=True)
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except TypeError:
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# For Python 3.3+ versions, this is the default
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r = low_conn.getresponse()
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resp = HTTPResponse.from_httplib(
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r,
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pool=conn,
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connection=low_conn,
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preload_content=False,
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decode_content=False,
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enforce_content_length=True,
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request_method=request.method,
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)
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except:
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# If we hit any problems here, clean up the connection.
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# Then, reraise so that we can handle the actual exception.
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low_conn.close()
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raise
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except (core.http3.exceptions.ProtocolError, socket.error) as err:
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raise ConnectionError(err, request=request)
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except core.http3.exceptions.PoolTimeout as e:
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raise ConnectionError(e, request=request)
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except (core.http3.exceptions.HttpError,) as e:
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if isinstance(e, core.http3.exceptions.PoolTimeout.ReadTimeout):
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raise core.http3.exceptions.PoolTimeout.ReadTimeout(
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e, request=request
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)
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else:
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raise
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return self.build_response(request, resp)
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class AsyncHTTPAdapter(HTTPAdapter):
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"""docstring for AsyncHTTPAdapter"""
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def __init__(self, backend=None, *args, **kwargs):
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super(AsyncHTTPAdapter, self).__init__(*args, **kwargs)
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async def build_response(self, req, resp):
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"""Builds a :class:`Response <requests.Response>` object from a urllib3
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response. This should not be called from user code, and is only exposed
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for use when subclassing the
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:class:`HTTPAdapter <requests.adapters.HTTPAdapter>`
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:param req: The :class:`PreparedRequest <PreparedRequest>` used to generate the response.
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:param resp: The urllib3 response object.
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:rtype: requests.Response
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"""
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response = AsyncResponse()
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# Fallback to None if there's no status_code, for whatever reason.
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response.status_code = getattr(resp, "status", None)
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# Make headers case-insensitive.
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response.headers = HTTPHeaderDict(getattr(resp, "headers", {}))
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# Set encoding.
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response.encoding = get_encoding_from_headers(response.headers)
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response.raw = resp
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# response.reason = response.raw.reason
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if isinstance(req.url, bytes):
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response.url = req.url.decode("utf-8")
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else:
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response.url = req.url
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# Add new cookies from the server.
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extract_cookies_to_jar(response.cookies, req, resp)
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# Give the Response some context.
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response.request = req
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response.connection = self
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return response
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def init_poolmanager(
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self, connections, maxsize, block=DEFAULT_POOLBLOCK, **pool_kwargs
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):
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"""Initializes a urllib3 PoolManager.
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This method should not be called from user code, and is only
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exposed for use when subclassing the
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|
:class:`HTTPAdapter <requests.adapters.HTTPAdapter>`.
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:param connections: The number of urllib3 connection pools to cache.
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|
:param maxsize: The maximum number of connections to save in the pool.
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:param block: Block when no free connections are available.
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:param pool_kwargs: Extra keyword arguments used to initialize the Pool Manager.
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"""
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# save these values for pickling
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self._pool_connections = connections
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self._pool_maxsize = maxsize
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self._pool_block = block
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# self.poolmanager = AsyncPoolManager(
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# num_pools=connections,
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# maxsize=maxsize,
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# block=block,
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# strict=True,
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# **pool_kwargs,
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# )
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def get_connection(self, url, proxies=None, verify=None, cert=None):
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"""Returns a urllib3 connection for the given URL. This should not be
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called from user code, and is only exposed for use when subclassing the
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:class:`HTTPAdapter <requests.adapters.HTTPAdapter>`.
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:param url: The URL to connect to.
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:param proxies: (optional) A Requests-style dictionary of proxies used on this request.
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:rtype: urllib3.ConnectionPool
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"""
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pool_kwargs = _pool_kwargs(verify, cert)
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proxy = select_proxy(url, proxies)
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if proxy:
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proxy = prepend_scheme_if_needed(proxy, "http")
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proxy_manager = self.proxy_manager_for(proxy)
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conn = proxy_manager.connection_from_url(
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url, pool_kwargs=pool_kwargs
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)
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else:
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# Only scheme should be lower case
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parsed = urlparse(url)
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url = parsed.geturl()
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conn = self.poolmanager.connection_from_url(
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url, pool_kwargs=pool_kwargs
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)
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return conn
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def close(self):
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"""Disposes of any internal state.
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Currently, this closes the PoolManager and any active ProxyManager,
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which closes any pooled connections.
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"""
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self.poolmanager.clear()
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for proxy in self.proxy_manager.values():
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proxy.clear()
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pass
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async def send(
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self,
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request,
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stream=False,
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timeout=None,
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verify=True,
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|
cert=None,
|
|
proxies=None,
|
|
):
|
|
"""Sends PreparedRequest object. Returns Response object.
|
|
|
|
:param request: The :class:`PreparedRequest <PreparedRequest>` being sent.
|
|
:param stream: (optional) Whether to stream the request content.
|
|
:param timeout: (optional) How long to wait for the server to send
|
|
data before giving up, as a float, or a :ref:`(connect timeout,
|
|
read timeout) <timeouts>` tuple.
|
|
:type timeout: float or tuple or urllib3 Timeout object
|
|
:param verify: (optional) Either a boolean, in which case it controls whether
|
|
we verify the server's TLS certificate, or a string, in which case it
|
|
must be a path to a CA bundle to use
|
|
:param cert: (optional) Any user-provided SSL certificate to be trusted.
|
|
:param proxies: (optional) The proxies dictionary to apply to the request.
|
|
:rtype: requests.Response
|
|
"""
|
|
conn = self.get_connection(request.url, proxies, verify, cert)
|
|
|
|
url = self.request_url(request, proxies)
|
|
self.add_headers(request)
|
|
chunked = not (
|
|
request.body is None or "Content-Length" in request.headers
|
|
)
|
|
if isinstance(timeout, tuple):
|
|
try:
|
|
connect, read = timeout
|
|
timeout = TimeoutSauce(connect=connect, read=read)
|
|
except ValueError as e:
|
|
# this may raise a string formatting error.
|
|
err = (
|
|
"Invalid timeout {0}. Pass a (connect, read) "
|
|
"timeout tuple, or a single float to set "
|
|
"both timeouts to the same value".format(timeout)
|
|
)
|
|
raise ValueError(err)
|
|
|
|
elif isinstance(timeout, TimeoutSauce):
|
|
pass
|
|
else:
|
|
timeout = TimeoutSauce(connect=timeout, read=timeout)
|
|
try:
|
|
if not chunked:
|
|
resp = await core.request(
|
|
method=request.method,
|
|
url=url,
|
|
body=request.body,
|
|
headers=request.headers,
|
|
redirect=False,
|
|
assert_same_host=False,
|
|
preload_content=False,
|
|
decode_content=False,
|
|
retries=self.max_retries,
|
|
timeout=timeout,
|
|
enforce_content_length=True,
|
|
pool=conn,
|
|
)
|
|
|
|
# Send the request.
|
|
else:
|
|
if hasattr(conn, "proxy_pool"):
|
|
conn = conn.proxy_pool
|
|
low_conn = conn._get_conn(timeout=DEFAULT_POOL_TIMEOUT)
|
|
try:
|
|
low_conn.putrequest(
|
|
request.method, url, skip_accept_encoding=True
|
|
)
|
|
for header, value in request.headers.items():
|
|
low_conn.putheader(header, value)
|
|
low_conn.endheaders()
|
|
for i in request.body:
|
|
chunk_size = len(i)
|
|
if chunk_size == 0:
|
|
continue
|
|
|
|
low_conn.send(hex(chunk_size)[2:].encode("utf-8"))
|
|
low_conn.send(b"\r\n")
|
|
low_conn.send(i)
|
|
low_conn.send(b"\r\n")
|
|
low_conn.send(b"0\r\n\r\n")
|
|
# Receive the response from the server
|
|
try:
|
|
# For Python 2.7, use buffering of HTTP responses
|
|
r = alow_conn.getresponse(buffering=True)
|
|
except TypeError:
|
|
# For Python 3.3+ versions, this is the default
|
|
r = low_conn.getresponse()
|
|
resp = HTTPResponse.from_httplib(
|
|
r,
|
|
pool=conn,
|
|
connection=low_conn,
|
|
preload_content=False,
|
|
decode_content=False,
|
|
enforce_content_length=True,
|
|
request_method=request.method,
|
|
)
|
|
except:
|
|
# If we hit any problems here, clean up the connection.
|
|
# Then, reraise so that we can handle the actual exception.
|
|
low_conn.close()
|
|
raise
|
|
|
|
except (ProtocolError, socket.error) as err:
|
|
raise ConnectionError(err, request=request)
|
|
|
|
except MaxRetryError as e:
|
|
if isinstance(e.reason, ConnectTimeoutError):
|
|
# TODO: Remove this in 3.0.0: see #2811
|
|
if not isinstance(e.reason, NewConnectionError):
|
|
raise ConnectTimeout(e, request=request)
|
|
|
|
if isinstance(e.reason, ResponseError):
|
|
raise RetryError(e, request=request)
|
|
|
|
if isinstance(e.reason, _ProxyError):
|
|
raise ProxyError(e, request=request)
|
|
|
|
if isinstance(e.reason, _SSLError):
|
|
# This branch is for urllib3 v1.22 and later.
|
|
raise SSLError(e, request=request)
|
|
|
|
raise ConnectionError(e, request=request)
|
|
|
|
except ClosedPoolError as e:
|
|
raise ConnectionError(e, request=request)
|
|
|
|
except _ProxyError as e:
|
|
raise ProxyError(e)
|
|
|
|
except (_SSLError, _HTTPError) as e:
|
|
if isinstance(e, _SSLError):
|
|
# This branch is for urllib3 versions earlier than v1.22
|
|
raise SSLError(e, request=request)
|
|
|
|
elif isinstance(e, ReadTimeoutError):
|
|
raise ReadTimeout(e, request=request)
|
|
|
|
else:
|
|
raise
|
|
|
|
return await self.build_response(request, resp)
|