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poolmanager.py
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# urllib3/poolmanager.py # Copyright 2008-2014 Andrey Petrov and contributors (see CONTRIBUTORS.txt) # # This module is part of urllib3 and is released under # the MIT License: http://www.opensource.org/licenses/mit-license.php import logging try: # Python 3 from urllib.parse import urljoin except ImportError: from urlparse import urljoin from ._collections import RecentlyUsedContainer from .connectionpool import HTTPConnectionPool, HTTPSConnectionPool from .connectionpool import port_by_scheme from .request import RequestMethods from .util import parse_url __all__ = ['PoolManager', 'ProxyManager', 'proxy_from_url'] pool_classes_by_scheme = { 'http': HTTPConnectionPool, 'https': HTTPSConnectionPool, } log = logging.getLogger(__name__) SSL_KEYWORDS = ('key_file', 'cert_file', 'cert_reqs', 'ca_certs', 'ssl_version') class PoolManager(RequestMethods): """ Allows for arbitrary requests while transparently keeping track of necessary connection pools for you. :param num_pools: Number of connection pools to cache before discarding the least recently used pool. :param headers: Headers to include with all requests, unless other headers are given explicitly. :param \**connection_pool_kw: Additional parameters are used to create fresh :class:`urllib3.connectionpool.ConnectionPool` instances. Example: :: >>> manager = PoolManager(num_pools=2) >>> r = manager.request('GET', 'http://google.com/') >>> r = manager.request('GET', 'http://google.com/mail') >>> r = manager.request('GET', 'http://yahoo.com/') >>> len(manager.pools) 2 """ proxy = None def __init__(self, num_pools=10, headers=None, **connection_pool_kw): RequestMethods.__init__(self, headers) self.connection_pool_kw = connection_pool_kw self.pools = RecentlyUsedContainer(num_pools, dispose_func=lambda p: p.close()) def _new_pool(self, scheme, host, port): """ Create a new :class:`ConnectionPool` based on host, port and scheme. This method is used to actually create the connection pools handed out by :meth:`connection_from_url` and companion methods. It is intended to be overridden for customization. """ pool_cls = pool_classes_by_scheme[scheme] kwargs = self.connection_pool_kw if scheme == 'http': kwargs = self.connection_pool_kw.copy() for kw in SSL_KEYWORDS: kwargs.pop(kw, None) return pool_cls(host, port, **kwargs) def clear(self): """ Empty our store of pools and direct them all to close. This will not affect in-flight connections, but they will not be re-used after completion. """ self.pools.clear() def connection_from_host(self, host, port=None, scheme='http'): """ Get a :class:`ConnectionPool` based on the host, port, and scheme. If ``port`` isn't given, it will be derived from the ``scheme`` using ``urllib3.connectionpool.port_by_scheme``. """ scheme = scheme or 'http' port = port or port_by_scheme.get(scheme, 80) pool_key = (scheme, host, port) with self.pools.lock: # If the scheme, host, or port doesn't match existing open # connections, open a new ConnectionPool. pool = self.pools.get(pool_key) if pool: return pool # Make a fresh ConnectionPool of the desired type pool = self._new_pool(scheme, host, port) self.pools[pool_key] = pool return pool def connection_from_url(self, url): """ Similar to :func:`urllib3.connectionpool.connection_from_url` but doesn't pass any additional parameters to the :class:`urllib3.connectionpool.ConnectionPool` constructor. Additional parameters are taken from the :class:`.PoolManager` constructor. """ u = parse_url(url) return self.connection_from_host(u.host, port=u.port, scheme=u.scheme) def urlopen(self, method, url, redirect=True, **kw): """ Same as :meth:`urllib3.connectionpool.HTTPConnectionPool.urlopen` with custom cross-host redirect logic and only sends the request-uri portion of the ``url``. The given ``url`` parameter must be absolute, such that an appropriate :class:`urllib3.connectionpool.ConnectionPool` can be chosen for it. """ u = parse_url(url) conn = self.connection_from_host(u.host, port=u.port, scheme=u.scheme) kw['assert_same_host'] = False kw['redirect'] = False if 'headers' not in kw: kw['headers'] = self.headers if self.proxy is not None and u.scheme == "http": response = conn.urlopen(method, url, **kw) else: response = conn.urlopen(method, u.request_uri, **kw) redirect_location = redirect and response.get_redirect_location() if not redirect_location: return response # Support relative URLs for redirecting. redirect_location = urljoin(url, redirect_location) # RFC 2616, Section 10.3.4 if response.status == 303: method = 'GET' log.info("Redirecting %s -> %s" % (url, redirect_location)) kw['retries'] = kw.get('retries', 3) - 1 # Persist retries countdown kw['redirect'] = redirect return self.urlopen(method, redirect_location, **kw) class ProxyManager(PoolManager): """ Behaves just like :class:`PoolManager`, but sends all requests through the defined proxy, using the CONNECT method for HTTPS URLs. :param proxy_url: The URL of the proxy to be used. :param proxy_headers: A dictionary contaning headers that will be sent to the proxy. In case of HTTP they are being sent with each request, while in the HTTPS/CONNECT case they are sent only once. Could be used for proxy authentication. Example: >>> proxy = urllib3.ProxyManager('http://localhost:3128/') >>> r1 = proxy.request('GET', 'http://google.com/') >>> r2 = proxy.request('GET', 'http://httpbin.org/') >>> len(proxy.pools) 1 >>> r3 = proxy.request('GET', 'https://httpbin.org/') >>> r4 = proxy.request('GET', 'https://twitter.com/') >>> len(proxy.pools) 3 """ def __init__(self, proxy_url, num_pools=10, headers=None, proxy_headers=None, **connection_pool_kw): if isinstance(proxy_url, HTTPConnectionPool): proxy_url = '%s://%s:%i' % (proxy_url.scheme, proxy_url.host, proxy_url.port) proxy = parse_url(proxy_url) if not proxy.port: port = port_by_scheme.get(proxy.scheme, 80) proxy = proxy._replace(port=port) self.proxy = proxy self.proxy_headers = proxy_headers or {} assert self.proxy.scheme in ("http", "https"), \ 'Not supported proxy scheme %s' % self.proxy.scheme connection_pool_kw['_proxy'] = self.proxy connection_pool_kw['_proxy_headers'] = self.proxy_headers super(ProxyManager, self).__init__( num_pools, headers, **connection_pool_kw) def connection_from_host(self, host, port=None, scheme='http'): if scheme == "https": return super(ProxyManager, self).connection_from_host( host, port, scheme) return super(ProxyManager, self).connection_from_host( self.proxy.host, self.proxy.port, self.proxy.scheme) def _set_proxy_headers(self, url, headers=None): """ Sets headers needed by proxies: specifically, the Accept and Host headers. Only sets headers not provided by the user. """ headers_ = {'Accept': '*/*'} netloc = parse_url(url).netloc if netloc: headers_['Host'] = netloc if headers: headers_.update(headers) return headers_ def urlopen(self, method, url, redirect=True, **kw): "Same as HTTP(S)ConnectionPool.urlopen, ``url`` must be absolute." u = parse_url(url) if u.scheme == "http": # For proxied HTTPS requests, httplib sets the necessary headers # on the CONNECT to the proxy. For HTTP, we'll definitely # need to set 'Host' at the very least. kw['headers'] = self._set_proxy_headers(url, kw.get('headers', self.headers)) return super(ProxyManager, self).urlopen(method, url, redirect, **kw) def proxy_from_url(url, **kw): return ProxyManager(proxy_url=url, **kw)