367 lines
13 KiB
Python
367 lines
13 KiB
Python
from __future__ import absolute_import
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import collections
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import functools
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import logging
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try: # Python 3
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from urllib.parse import urljoin
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except ImportError:
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from urlparse import urljoin
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from ._collections import RecentlyUsedContainer
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from .connectionpool import HTTPConnectionPool, HTTPSConnectionPool
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from .connectionpool import port_by_scheme
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from .exceptions import LocationValueError, MaxRetryError, ProxySchemeUnknown
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from .request import RequestMethods
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from .util.url import parse_url
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from .util.retry import Retry
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__all__ = ['PoolManager', 'ProxyManager', 'proxy_from_url']
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log = logging.getLogger(__name__)
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SSL_KEYWORDS = ('key_file', 'cert_file', 'cert_reqs', 'ca_certs',
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'ssl_version', 'ca_cert_dir')
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# The base fields to use when determining what pool to get a connection from;
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# these do not rely on the ``connection_pool_kw`` and can be determined by the
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# URL and potentially the ``urllib3.connection.port_by_scheme`` dictionary.
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#
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# All custom key schemes should include the fields in this key at a minimum.
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BasePoolKey = collections.namedtuple('BasePoolKey', ('scheme', 'host', 'port'))
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# The fields to use when determining what pool to get a HTTP and HTTPS
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# connection from. All additional fields must be present in the PoolManager's
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# ``connection_pool_kw`` instance variable.
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HTTPPoolKey = collections.namedtuple(
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'HTTPPoolKey', BasePoolKey._fields + ('timeout', 'retries', 'strict',
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'block', 'source_address')
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)
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HTTPSPoolKey = collections.namedtuple(
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'HTTPSPoolKey', HTTPPoolKey._fields + SSL_KEYWORDS
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)
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def _default_key_normalizer(key_class, request_context):
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"""
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Create a pool key of type ``key_class`` for a request.
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According to RFC 3986, both the scheme and host are case-insensitive.
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Therefore, this function normalizes both before constructing the pool
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key for an HTTPS request. If you wish to change this behaviour, provide
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alternate callables to ``key_fn_by_scheme``.
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:param key_class:
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The class to use when constructing the key. This should be a namedtuple
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with the ``scheme`` and ``host`` keys at a minimum.
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:param request_context:
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A dictionary-like object that contain the context for a request.
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It should contain a key for each field in the :class:`HTTPPoolKey`
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"""
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context = {}
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for key in key_class._fields:
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context[key] = request_context.get(key)
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context['scheme'] = context['scheme'].lower()
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context['host'] = context['host'].lower()
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return key_class(**context)
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# A dictionary that maps a scheme to a callable that creates a pool key.
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# This can be used to alter the way pool keys are constructed, if desired.
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# Each PoolManager makes a copy of this dictionary so they can be configured
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# globally here, or individually on the instance.
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key_fn_by_scheme = {
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'http': functools.partial(_default_key_normalizer, HTTPPoolKey),
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'https': functools.partial(_default_key_normalizer, HTTPSPoolKey),
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}
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pool_classes_by_scheme = {
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'http': HTTPConnectionPool,
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'https': HTTPSConnectionPool,
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}
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class PoolManager(RequestMethods):
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"""
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Allows for arbitrary requests while transparently keeping track of
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necessary connection pools for you.
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:param num_pools:
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Number of connection pools to cache before discarding the least
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recently used pool.
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:param headers:
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Headers to include with all requests, unless other headers are given
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explicitly.
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:param \**connection_pool_kw:
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Additional parameters are used to create fresh
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:class:`urllib3.connectionpool.ConnectionPool` instances.
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Example::
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>>> manager = PoolManager(num_pools=2)
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>>> r = manager.request('GET', 'http://google.com/')
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>>> r = manager.request('GET', 'http://google.com/mail')
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>>> r = manager.request('GET', 'http://yahoo.com/')
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>>> len(manager.pools)
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2
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"""
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proxy = None
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def __init__(self, num_pools=10, headers=None, **connection_pool_kw):
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RequestMethods.__init__(self, headers)
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self.connection_pool_kw = connection_pool_kw
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self.pools = RecentlyUsedContainer(num_pools,
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dispose_func=lambda p: p.close())
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# Locally set the pool classes and keys so other PoolManagers can
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# override them.
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self.pool_classes_by_scheme = pool_classes_by_scheme
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self.key_fn_by_scheme = key_fn_by_scheme.copy()
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def __enter__(self):
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return self
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def __exit__(self, exc_type, exc_val, exc_tb):
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self.clear()
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# Return False to re-raise any potential exceptions
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return False
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def _new_pool(self, scheme, host, port):
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"""
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Create a new :class:`ConnectionPool` based on host, port and scheme.
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This method is used to actually create the connection pools handed out
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by :meth:`connection_from_url` and companion methods. It is intended
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to be overridden for customization.
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"""
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pool_cls = self.pool_classes_by_scheme[scheme]
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kwargs = self.connection_pool_kw
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if scheme == 'http':
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kwargs = self.connection_pool_kw.copy()
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for kw in SSL_KEYWORDS:
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kwargs.pop(kw, None)
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return pool_cls(host, port, **kwargs)
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def clear(self):
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"""
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Empty our store of pools and direct them all to close.
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This will not affect in-flight connections, but they will not be
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re-used after completion.
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"""
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self.pools.clear()
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def connection_from_host(self, host, port=None, scheme='http'):
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"""
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Get a :class:`ConnectionPool` based on the host, port, and scheme.
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If ``port`` isn't given, it will be derived from the ``scheme`` using
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``urllib3.connectionpool.port_by_scheme``.
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"""
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if not host:
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raise LocationValueError("No host specified.")
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request_context = self.connection_pool_kw.copy()
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request_context['scheme'] = scheme or 'http'
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if not port:
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port = port_by_scheme.get(request_context['scheme'].lower(), 80)
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request_context['port'] = port
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request_context['host'] = host
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return self.connection_from_context(request_context)
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def connection_from_context(self, request_context):
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"""
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Get a :class:`ConnectionPool` based on the request context.
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``request_context`` must at least contain the ``scheme`` key and its
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value must be a key in ``key_fn_by_scheme`` instance variable.
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"""
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scheme = request_context['scheme'].lower()
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pool_key_constructor = self.key_fn_by_scheme[scheme]
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pool_key = pool_key_constructor(request_context)
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return self.connection_from_pool_key(pool_key)
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def connection_from_pool_key(self, pool_key):
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"""
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Get a :class:`ConnectionPool` based on the provided pool key.
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``pool_key`` should be a namedtuple that only contains immutable
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objects. At a minimum it must have the ``scheme``, ``host``, and
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``port`` fields.
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"""
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with self.pools.lock:
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# If the scheme, host, or port doesn't match existing open
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# connections, open a new ConnectionPool.
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pool = self.pools.get(pool_key)
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if pool:
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return pool
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# Make a fresh ConnectionPool of the desired type
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pool = self._new_pool(pool_key.scheme, pool_key.host, pool_key.port)
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self.pools[pool_key] = pool
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return pool
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def connection_from_url(self, url):
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"""
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Similar to :func:`urllib3.connectionpool.connection_from_url` but
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doesn't pass any additional parameters to the
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:class:`urllib3.connectionpool.ConnectionPool` constructor.
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Additional parameters are taken from the :class:`.PoolManager`
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constructor.
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"""
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u = parse_url(url)
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return self.connection_from_host(u.host, port=u.port, scheme=u.scheme)
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def urlopen(self, method, url, redirect=True, **kw):
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"""
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Same as :meth:`urllib3.connectionpool.HTTPConnectionPool.urlopen`
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with custom cross-host redirect logic and only sends the request-uri
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portion of the ``url``.
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The given ``url`` parameter must be absolute, such that an appropriate
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:class:`urllib3.connectionpool.ConnectionPool` can be chosen for it.
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"""
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u = parse_url(url)
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conn = self.connection_from_host(u.host, port=u.port, scheme=u.scheme)
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kw['assert_same_host'] = False
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kw['redirect'] = False
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if 'headers' not in kw:
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kw['headers'] = self.headers
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if self.proxy is not None and u.scheme == "http":
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response = conn.urlopen(method, url, **kw)
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else:
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response = conn.urlopen(method, u.request_uri, **kw)
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redirect_location = redirect and response.get_redirect_location()
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if not redirect_location:
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return response
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# Support relative URLs for redirecting.
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redirect_location = urljoin(url, redirect_location)
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# RFC 7231, Section 6.4.4
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if response.status == 303:
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method = 'GET'
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retries = kw.get('retries')
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if not isinstance(retries, Retry):
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retries = Retry.from_int(retries, redirect=redirect)
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try:
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retries = retries.increment(method, url, response=response, _pool=conn)
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except MaxRetryError:
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if retries.raise_on_redirect:
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raise
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return response
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kw['retries'] = retries
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kw['redirect'] = redirect
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log.info("Redirecting %s -> %s", url, redirect_location)
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return self.urlopen(method, redirect_location, **kw)
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class ProxyManager(PoolManager):
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"""
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Behaves just like :class:`PoolManager`, but sends all requests through
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the defined proxy, using the CONNECT method for HTTPS URLs.
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:param proxy_url:
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The URL of the proxy to be used.
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:param proxy_headers:
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A dictionary contaning headers that will be sent to the proxy. In case
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of HTTP they are being sent with each request, while in the
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HTTPS/CONNECT case they are sent only once. Could be used for proxy
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authentication.
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Example:
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>>> proxy = urllib3.ProxyManager('http://localhost:3128/')
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>>> r1 = proxy.request('GET', 'http://google.com/')
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>>> r2 = proxy.request('GET', 'http://httpbin.org/')
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>>> len(proxy.pools)
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1
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>>> r3 = proxy.request('GET', 'https://httpbin.org/')
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>>> r4 = proxy.request('GET', 'https://twitter.com/')
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>>> len(proxy.pools)
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3
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"""
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def __init__(self, proxy_url, num_pools=10, headers=None,
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proxy_headers=None, **connection_pool_kw):
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if isinstance(proxy_url, HTTPConnectionPool):
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proxy_url = '%s://%s:%i' % (proxy_url.scheme, proxy_url.host,
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proxy_url.port)
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proxy = parse_url(proxy_url)
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if not proxy.port:
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port = port_by_scheme.get(proxy.scheme, 80)
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proxy = proxy._replace(port=port)
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if proxy.scheme not in ("http", "https"):
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raise ProxySchemeUnknown(proxy.scheme)
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self.proxy = proxy
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self.proxy_headers = proxy_headers or {}
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connection_pool_kw['_proxy'] = self.proxy
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connection_pool_kw['_proxy_headers'] = self.proxy_headers
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super(ProxyManager, self).__init__(
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num_pools, headers, **connection_pool_kw)
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def connection_from_host(self, host, port=None, scheme='http'):
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if scheme == "https":
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return super(ProxyManager, self).connection_from_host(
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host, port, scheme)
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return super(ProxyManager, self).connection_from_host(
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self.proxy.host, self.proxy.port, self.proxy.scheme)
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def _set_proxy_headers(self, url, headers=None):
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"""
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Sets headers needed by proxies: specifically, the Accept and Host
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headers. Only sets headers not provided by the user.
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"""
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headers_ = {'Accept': '*/*'}
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netloc = parse_url(url).netloc
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if netloc:
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headers_['Host'] = netloc
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if headers:
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headers_.update(headers)
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return headers_
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def urlopen(self, method, url, redirect=True, **kw):
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"Same as HTTP(S)ConnectionPool.urlopen, ``url`` must be absolute."
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u = parse_url(url)
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if u.scheme == "http":
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# For proxied HTTPS requests, httplib sets the necessary headers
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# on the CONNECT to the proxy. For HTTP, we'll definitely
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# need to set 'Host' at the very least.
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headers = kw.get('headers', self.headers)
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kw['headers'] = self._set_proxy_headers(url, headers)
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return super(ProxyManager, self).urlopen(method, url, redirect=redirect, **kw)
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def proxy_from_url(url, **kw):
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return ProxyManager(proxy_url=url, **kw)
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