453 lines
17 KiB
Python
453 lines
17 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 .models import Response
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from .packages.urllib3.poolmanager import PoolManager, proxy_from_url
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from .packages.urllib3.response import HTTPResponse
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from .packages.urllib3.util import Timeout as TimeoutSauce
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from .packages.urllib3.util.retry import Retry
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from .compat import urlparse, basestring
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from .utils import (DEFAULT_CA_BUNDLE_PATH, get_encoding_from_headers,
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prepend_scheme_if_needed, get_auth_from_url, urldefragauth,
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select_proxy)
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from .structures import CaseInsensitiveDict
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from .packages.urllib3.exceptions import ClosedPoolError
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from .packages.urllib3.exceptions import ConnectTimeoutError
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from .packages.urllib3.exceptions import HTTPError as _HTTPError
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from .packages.urllib3.exceptions import MaxRetryError
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from .packages.urllib3.exceptions import NewConnectionError
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from .packages.urllib3.exceptions import ProxyError as _ProxyError
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from .packages.urllib3.exceptions import ProtocolError
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from .packages.urllib3.exceptions import ReadTimeoutError
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from .packages.urllib3.exceptions import SSLError as _SSLError
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from .packages.urllib3.exceptions import ResponseError
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from .cookies import extract_cookies_to_jar
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from .exceptions import (ConnectionError, ConnectTimeout, ReadTimeout, SSLError,
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ProxyError, RetryError)
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from .auth import _basic_auth_str
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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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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(self):
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raise NotImplementedError
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def close(self):
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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 int 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__ = ['max_retries', 'config', '_pool_connections', '_pool_maxsize',
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'_pool_block']
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def __init__(self, pool_connections=DEFAULT_POOLSIZE,
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pool_maxsize=DEFAULT_POOLSIZE, max_retries=DEFAULT_RETRIES,
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pool_block=DEFAULT_POOLBLOCK):
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if max_retries == DEFAULT_RETRIES:
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self.max_retries = Retry(0, read=False)
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else:
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self.max_retries = Retry.from_int(max_retries)
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self.config = {}
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self.proxy_manager = {}
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super(HTTPAdapter, self).__init__()
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self._pool_connections = pool_connections
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self._pool_maxsize = pool_maxsize
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self._pool_block = pool_block
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self.init_poolmanager(pool_connections, pool_maxsize, block=pool_block)
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def __getstate__(self):
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return dict((attr, getattr(self, attr, None)) for attr in
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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(self._pool_connections, self._pool_maxsize,
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block=self._pool_block)
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def init_poolmanager(self, connections, maxsize, block=DEFAULT_POOLBLOCK, **pool_kwargs):
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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 = PoolManager(num_pools=connections, maxsize=maxsize,
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block=block, strict=True, **pool_kwargs)
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def proxy_manager_for(self, proxy, **proxy_kwargs):
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"""Return urllib3 ProxyManager for the given proxy.
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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 proxy: The proxy to return a urllib3 ProxyManager for.
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:param proxy_kwargs: Extra keyword arguments used to configure the Proxy Manager.
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:returns: ProxyManager
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"""
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if not proxy in self.proxy_manager:
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proxy_headers = self.proxy_headers(proxy)
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self.proxy_manager[proxy] = proxy_from_url(
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proxy,
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proxy_headers=proxy_headers,
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num_pools=self._pool_connections,
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maxsize=self._pool_maxsize,
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block=self._pool_block,
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**proxy_kwargs)
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return self.proxy_manager[proxy]
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def cert_verify(self, conn, url, verify, cert):
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"""Verify a SSL certificate. This method should not be called from user
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code, and is only exposed for use when subclassing the
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:class:`HTTPAdapter <requests.adapters.HTTPAdapter>`.
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:param conn: The urllib3 connection object associated with the cert.
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:param url: The requested URL.
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:param verify: Whether we should actually verify the certificate.
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:param cert: The SSL certificate to verify.
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"""
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if url.lower().startswith('https') and 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:
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raise Exception("Could not find a suitable SSL CA certificate bundle.")
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conn.cert_reqs = 'CERT_REQUIRED'
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if not os.path.isdir(cert_loc):
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conn.ca_certs = cert_loc
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else:
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conn.ca_cert_dir = cert_loc
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else:
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conn.cert_reqs = 'CERT_NONE'
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conn.ca_certs = None
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conn.ca_cert_dir = None
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if cert:
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if not isinstance(cert, basestring):
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conn.cert_file = cert[0]
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conn.key_file = cert[1]
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else:
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conn.cert_file = cert
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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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"""
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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', None)
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# Make headers case-insensitive.
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response.headers = CaseInsensitiveDict(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 get_connection(self, url, proxies=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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"""
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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(url)
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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(url)
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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 just closes the PoolManager, which closes pooled
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connections.
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"""
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self.poolmanager.clear()
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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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"""
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proxy = select_proxy(request.url, proxies)
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scheme = urlparse(request.url).scheme
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if proxy and scheme != 'https':
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url = urldefragauth(request.url)
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else:
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url = request.path_url
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return 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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"""
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headers = {}
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username, password = get_auth_from_url(proxy)
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if username and password:
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headers['Proxy-Authorization'] = _basic_auth_str(username,
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password)
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return headers
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def send(self, request, stream=False, timeout=None, verify=True, cert=None, proxies=None):
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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) Whether to verify SSL certificates.
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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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conn = self.get_connection(request.url, proxies)
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self.cert_verify(conn, request.url, verify, cert)
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url = self.request_url(request, proxies)
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self.add_headers(request)
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chunked = not (request.body is None or 'Content-Length' in request.headers)
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if isinstance(timeout, tuple):
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try:
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connect, read = timeout
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timeout = TimeoutSauce(connect=connect, read=read)
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except ValueError as e:
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# this may raise a string formatting error.
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err = ("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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raise ValueError(err)
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else:
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timeout = TimeoutSauce(connect=timeout, read=timeout)
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try:
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if not chunked:
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resp = conn.urlopen(
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method=request.method,
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url=url,
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body=request.body,
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headers=request.headers,
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redirect=False,
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assert_same_host=False,
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preload_content=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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)
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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(request.method,
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url,
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skip_accept_encoding=True)
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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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low_conn.send(hex(len(i))[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+ versions, use buffering of HTTP
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# responses
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r = low_conn.getresponse(buffering=True)
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except TypeError:
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# For compatibility with Python 2.6 versions and back
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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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)
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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 (ProtocolError, socket.error) as err:
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raise ConnectionError(err, request=request)
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except MaxRetryError as e:
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if isinstance(e.reason, ConnectTimeoutError):
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# TODO: Remove this in 3.0.0: see #2811
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if not isinstance(e.reason, NewConnectionError):
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raise ConnectTimeout(e, request=request)
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if isinstance(e.reason, ResponseError):
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raise RetryError(e, request=request)
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raise ConnectionError(e, request=request)
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except ClosedPoolError as e:
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raise ConnectionError(e, request=request)
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except _ProxyError as e:
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raise ProxyError(e)
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except (_SSLError, _HTTPError) as e:
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if isinstance(e, _SSLError):
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raise SSLError(e, request=request)
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elif isinstance(e, ReadTimeoutError):
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raise ReadTimeout(e, request=request)
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else:
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raise
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return self.build_response(request, resp)
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