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259 lines
8.8 KiB
Python
259 lines
8.8 KiB
Python
# urllib3/poolmanager.py
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# Copyright 2008-2014 Andrey Petrov and contributors (see CONTRIBUTORS.txt)
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#
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# This module is part of urllib3 and is released under
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# the MIT License: http://www.opensource.org/licenses/mit-license.php
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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 .request import RequestMethods
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from .util import parse_url
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__all__ = ['PoolManager', 'ProxyManager', 'proxy_from_url']
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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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log = logging.getLogger(__name__)
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SSL_KEYWORDS = ('key_file', 'cert_file', 'cert_reqs', 'ca_certs',
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'ssl_version')
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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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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 = 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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scheme = scheme or 'http'
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port = port or port_by_scheme.get(scheme, 80)
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pool_key = (scheme, host, port)
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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(scheme, host, 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 2616, Section 10.3.4
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if response.status == 303:
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method = 'GET'
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log.info("Redirecting %s -> %s" % (url, redirect_location))
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kw['retries'] = kw.get('retries', 3) - 1 # Persist retries countdown
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kw['redirect'] = redirect
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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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self.proxy = proxy
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self.proxy_headers = proxy_headers or {}
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assert self.proxy.scheme in ("http", "https"), \
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'Not supported proxy scheme %s' % self.proxy.scheme
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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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kw['headers'] = self._set_proxy_headers(url, kw.get('headers',
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self.headers))
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return super(ProxyManager, self).urlopen(method, url, 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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