Spade
Mini Shell
import errno
import logging
import sys
import warnings
from socket import error as SocketError, timeout as SocketTimeout
import socket
try: # Python 3
from queue import LifoQueue, Empty, Full
except ImportError:
from Queue import LifoQueue, Empty, Full
import Queue as _ # Platform-specific: Windows
from .exceptions import (
ClosedPoolError,
ProtocolError,
EmptyPoolError,
HostChangedError,
LocationValueError,
MaxRetryError,
ProxyError,
ReadTimeoutError,
SSLError,
TimeoutError,
InsecureRequestWarning,
)
from .packages.ssl_match_hostname import CertificateError
from .packages import six
from .connection import (
port_by_scheme,
DummyConnection,
HTTPConnection, HTTPSConnection, VerifiedHTTPSConnection,
HTTPException, BaseSSLError, ConnectionError
)
from .request import RequestMethods
from .response import HTTPResponse
from .util.connection import is_connection_dropped
from .util.retry import Retry
from .util.timeout import Timeout
from .util.url import get_host
xrange = six.moves.xrange
log = logging.getLogger(__name__)
_Default = object()
## Pool objects
class ConnectionPool(object):
"""
Base class for all connection pools, such as
:class:`.HTTPConnectionPool` and :class:`.HTTPSConnectionPool`.
"""
scheme = None
QueueCls = LifoQueue
def __init__(self, host, port=None):
if not host:
raise LocationValueError("No host specified.")
# httplib doesn't like it when we include brackets in ipv6
addresses
self.host = host.strip('[]')
self.port = port
def __str__(self):
return '%s(host=%r, port=%r)' % (type(self).__name__,
self.host, self.port)
def __enter__(self):
return self
def __exit__(self, exc_type, exc_val, exc_tb):
self.close()
# Return False to re-raise any potential exceptions
return False
def close():
"""
Close all pooled connections and disable the pool.
"""
pass
# This is taken from
http://hg.python.org/cpython/file/7aaba721ebc0/Lib/socket.py#l252
_blocking_errnos = set([errno.EAGAIN, errno.EWOULDBLOCK])
class HTTPConnectionPool(ConnectionPool, RequestMethods):
"""
Thread-safe connection pool for one host.
:param host:
Host used for this HTTP Connection (e.g. "localhost"),
passed into
:class:`httplib.HTTPConnection`.
:param port:
Port used for this HTTP Connection (None is equivalent to 80),
passed
into :class:`httplib.HTTPConnection`.
:param strict:
Causes BadStatusLine to be raised if the status line can't be
parsed
as a valid HTTP/1.0 or 1.1 status line, passed into
:class:`httplib.HTTPConnection`.
.. note::
Only works in Python 2. This parameter is ignored in Python 3.
:param timeout:
Socket timeout in seconds for each individual connection. This can
be a float or integer, which sets the timeout for the HTTP request,
or an instance of :class:`urllib3.util.Timeout` which gives you
more
fine-grained control over request timeouts. After the constructor
has
been parsed, this is always a `urllib3.util.Timeout` object.
:param maxsize:
Number of connections to save that can be reused. More than 1 is
useful
in multithreaded situations. If ``block`` is set to false, more
connections will be created but they will not be saved once
they've
been used.
:param block:
If set to True, no more than ``maxsize`` connections will be used
at
a time. When no free connections are available, the call will block
until a connection has been released. This is a useful side effect
for
particular multithreaded situations where one does not want to use
more
than maxsize connections per host to prevent flooding.
:param headers:
Headers to include with all requests, unless other headers are
given
explicitly.
:param retries:
Retry configuration to use by default with requests in this pool.
:param _proxy:
Parsed proxy URL, should not be used directly, instead, see
:class:`urllib3.connectionpool.ProxyManager`"
:param _proxy_headers:
A dictionary with proxy headers, should not be used directly,
instead, see :class:`urllib3.connectionpool.ProxyManager`"
:param \**conn_kw:
Additional parameters are used to create fresh
:class:`urllib3.connection.HTTPConnection`,
:class:`urllib3.connection.HTTPSConnection` instances.
"""
scheme = 'http'
ConnectionCls = HTTPConnection
def __init__(self, host, port=None, strict=False,
timeout=Timeout.DEFAULT_TIMEOUT, maxsize=1, block=False,
headers=None, retries=None,
_proxy=None, _proxy_headers=None,
**conn_kw):
ConnectionPool.__init__(self, host, port)
RequestMethods.__init__(self, headers)
self.strict = strict
if not isinstance(timeout, Timeout):
timeout = Timeout.from_float(timeout)
if retries is None:
retries = Retry.DEFAULT
self.timeout = timeout
self.retries = retries
self.pool = self.QueueCls(maxsize)
self.block = block
self.proxy = _proxy
self.proxy_headers = _proxy_headers or {}
# Fill the queue up so that doing get() on it will block properly
for _ in xrange(maxsize):
self.pool.put(None)
# These are mostly for testing and debugging purposes.
self.num_connections = 0
self.num_requests = 0
self.conn_kw = conn_kw
if self.proxy:
# Enable Nagle's algorithm for proxies, to avoid packet
fragmentation.
# We cannot know if the user has added default socket options,
so we cannot replace the
# list.
self.conn_kw.setdefault('socket_options', [])
def _new_conn(self):
"""
Return a fresh :class:`HTTPConnection`.
"""
self.num_connections += 1
log.info("Starting new HTTP connection (%d): %s" %
(self.num_connections, self.host))
conn = self.ConnectionCls(host=self.host, port=self.port,
timeout=self.timeout.connect_timeout,
strict=self.strict, **self.conn_kw)
return conn
def _get_conn(self, timeout=None):
"""
Get a connection. Will return a pooled connection if one is
available.
If no connections are available and :prop:`.block` is ``False``,
then a
fresh connection is returned.
:param timeout:
Seconds to wait before giving up and raising
:class:`urllib3.exceptions.EmptyPoolError` if the pool is empty
and
:prop:`.block` is ``True``.
"""
conn = None
try:
conn = self.pool.get(block=self.block, timeout=timeout)
except AttributeError: # self.pool is None
raise ClosedPoolError(self, "Pool is closed.")
except Empty:
if self.block:
raise EmptyPoolError(self,
"Pool reached maximum size and no
more "
"connections are allowed.")
pass # Oh well, we'll create a new connection then
# If this is a persistent connection, check if it got disconnected
if conn and is_connection_dropped(conn):
log.info("Resetting dropped connection: %s" %
self.host)
conn.close()
if getattr(conn, 'auto_open', 1) == 0:
# This is a proxied connection that has been mutated by
# httplib._tunnel() and cannot be reused (since it would
# attempt to bypass the proxy)
conn = None
return conn or self._new_conn()
def _put_conn(self, conn):
"""
Put a connection back into the pool.
:param conn:
Connection object for the current host and port as returned by
:meth:`._new_conn` or :meth:`._get_conn`.
If the pool is already full, the connection is closed and discarded
because we exceeded maxsize. If connections are discarded
frequently,
then maxsize should be increased.
If the pool is closed, then the connection will be closed and
discarded.
"""
try:
self.pool.put(conn, block=False)
return # Everything is dandy, done.
except AttributeError:
# self.pool is None.
pass
except Full:
# This should never happen if self.block == True
log.warning(
"Connection pool is full, discarding connection:
%s" %
self.host)
# Connection never got put back into the pool, close it.
if conn:
conn.close()
def _validate_conn(self, conn):
"""
Called right before a request is made, after the socket is created.
"""
pass
def _prepare_proxy(self, conn):
# Nothing to do for HTTP connections.
pass
def _get_timeout(self, timeout):
""" Helper that always returns a
:class:`urllib3.util.Timeout` """
if timeout is _Default:
return self.timeout.clone()
if isinstance(timeout, Timeout):
return timeout.clone()
else:
# User passed us an int/float. This is for backwards
compatibility,
# can be removed later
return Timeout.from_float(timeout)
def _raise_timeout(self, err, url, timeout_value):
"""Is the error actually a timeout? Will raise a
ReadTimeout or pass"""
if isinstance(err, SocketTimeout):
raise ReadTimeoutError(self, url, "Read timed out. (read
timeout=%s)" % timeout_value)
# See the above comment about EAGAIN in Python 3. In Python 2 we
have
# to specifically catch it and throw the timeout error
if hasattr(err, 'errno') and err.errno in
_blocking_errnos:
raise ReadTimeoutError(self, url, "Read timed out. (read
timeout=%s)" % timeout_value)
# Catch possible read timeouts thrown as SSL errors. If not the
# case, rethrow the original. We need to do this because of:
# http://bugs.python.org/issue10272
if 'timed out' in str(err) or 'did not complete
(read)' in str(err): # Python 2.6
raise ReadTimeoutError(self, url, "Read timed out. (read
timeout=%s)" % timeout_value)
def _make_request(self, conn, method, url, timeout=_Default,
**httplib_request_kw):
"""
Perform a request on a given urllib connection object taken from
our
pool.
:param conn:
a connection from one of our connection pools
:param timeout:
Socket timeout in seconds for the request. This can be a
float or integer, which will set the same timeout value for
the socket connect and the socket read, or an instance of
:class:`urllib3.util.Timeout`, which gives you more
fine-grained
control over your timeouts.
"""
self.num_requests += 1
timeout_obj = self._get_timeout(timeout)
timeout_obj.start_connect()
conn.timeout = timeout_obj.connect_timeout
# Trigger any extra validation we need to do.
try:
self._validate_conn(conn)
except (SocketTimeout, BaseSSLError) as e:
# Py2 raises this as a BaseSSLError, Py3 raises it as socket
timeout.
self._raise_timeout(err=e, url=url, timeout_value=conn.timeout)
raise
# conn.request() calls httplib.*.request, not the method in
# urllib3.request. It also calls makefile (recv) on the socket.
conn.request(method, url, **httplib_request_kw)
# Reset the timeout for the recv() on the socket
read_timeout = timeout_obj.read_timeout
# App Engine doesn't have a sock attr
if getattr(conn, 'sock', None):
# In Python 3 socket.py will catch EAGAIN and return None when
you
# try and read into the file pointer created by http.client,
which
# instead raises a BadStatusLine exception. Instead of catching
# the exception and assuming all BadStatusLine exceptions are
read
# timeouts, check for a zero timeout before making the request.
if read_timeout == 0:
raise ReadTimeoutError(
self, url, "Read timed out. (read
timeout=%s)" % read_timeout)
if read_timeout is Timeout.DEFAULT_TIMEOUT:
conn.sock.settimeout(socket.getdefaulttimeout())
else: # None or a value
conn.sock.settimeout(read_timeout)
# Receive the response from the server
try:
try: # Python 2.7, use buffering of HTTP responses
httplib_response = conn.getresponse(buffering=True)
except TypeError: # Python 2.6 and older
httplib_response = conn.getresponse()
except (SocketTimeout, BaseSSLError, SocketError) as e:
self._raise_timeout(err=e, url=url, timeout_value=read_timeout)
raise
# AppEngine doesn't have a version attr.
http_version = getattr(conn, '_http_vsn_str',
'HTTP/?')
log.debug("\"%s %s %s\" %s %s" % (method, url,
http_version,
httplib_response.status,
httplib_response.length))
return httplib_response
def close(self):
"""
Close all pooled connections and disable the pool.
"""
# Disable access to the pool
old_pool, self.pool = self.pool, None
try:
while True:
conn = old_pool.get(block=False)
if conn:
conn.close()
except Empty:
pass # Done.
def is_same_host(self, url):
"""
Check if the given ``url`` is a member of the same host as this
connection pool.
"""
if url.startswith('/'):
return True
# TODO: Add optional support for socket.gethostbyname checking.
scheme, host, port = get_host(url)
# Use explicit default port for comparison when none is given
if self.port and not port:
port = port_by_scheme.get(scheme)
elif not self.port and port == port_by_scheme.get(scheme):
port = None
return (scheme, host, port) == (self.scheme, self.host, self.port)
def urlopen(self, method, url, body=None, headers=None, retries=None,
redirect=True, assert_same_host=True, timeout=_Default,
pool_timeout=None, release_conn=None, **response_kw):
"""
Get a connection from the pool and perform an HTTP request. This is
the
lowest level call for making a request, so you'll need to
specify all
the raw details.
.. note::
More commonly, it's appropriate to use a convenience method
provided
by :class:`.RequestMethods`, such as :meth:`request`.
.. note::
`release_conn` will only behave as expected if
`preload_content=False` because we want to make
`preload_content=False` the default behaviour someday soon
without
breaking backwards compatibility.
:param method:
HTTP request method (such as GET, POST, PUT, etc.)
:param body:
Data to send in the request body (useful for creating
POST requests, see HTTPConnectionPool.post_url for
more convenience).
:param headers:
Dictionary of custom headers to send, such as User-Agent,
If-None-Match, etc. If None, pool headers are used. If
provided,
these headers completely replace any pool-specific headers.
:param retries:
Configure the number of retries to allow before raising a
:class:`~urllib3.exceptions.MaxRetryError` exception.
Pass ``None`` to retry until you receive a response. Pass a
:class:`~urllib3.util.retry.Retry` object for fine-grained
control
over different types of retries.
Pass an integer number to retry connection errors that many
times,
but no other types of errors. Pass zero to never retry.
If ``False``, then retries are disabled and any exception is
raised
immediately. Also, instead of raising a MaxRetryError on
redirects,
the redirect response will be returned.
:type retries: :class:`~urllib3.util.retry.Retry`, False, or an
int.
:param redirect:
If True, automatically handle redirects (status codes 301, 302,
303, 307, 308). Each redirect counts as a retry. Disabling
retries
will disable redirect, too.
:param assert_same_host:
If ``True``, will make sure that the host of the pool requests
is
consistent else will raise HostChangedError. When False, you
can
use the pool on an HTTP proxy and request foreign hosts.
:param timeout:
If specified, overrides the default timeout for this one
request. It may be a float (in seconds) or an instance of
:class:`urllib3.util.Timeout`.
:param pool_timeout:
If set and the pool is set to block=True, then this method will
block for ``pool_timeout`` seconds and raise EmptyPoolError if
no
connection is available within the time period.
:param release_conn:
If False, then the urlopen call will not release the connection
back into the pool once a response is received (but will
release if
you read the entire contents of the response such as when
`preload_content=True`). This is useful if you're not
preloading
the response's content immediately. You will need to call
``r.release_conn()`` on the response ``r`` to return the
connection
back into the pool. If None, it takes the value of
``response_kw.get('preload_content', True)``.
:param \**response_kw:
Additional parameters are passed to
:meth:`urllib3.response.HTTPResponse.from_httplib`
"""
if headers is None:
headers = self.headers
if not isinstance(retries, Retry):
retries = Retry.from_int(retries, redirect=redirect,
default=self.retries)
if release_conn is None:
release_conn = response_kw.get('preload_content',
True)
# Check host
if assert_same_host and not self.is_same_host(url):
raise HostChangedError(self, url, retries)
conn = None
# Merge the proxy headers. Only do this in HTTP. We have to copy
the
# headers dict so we can safely change it without those changes
being
# reflected in anyone else's copy.
if self.scheme == 'http':
headers = headers.copy()
headers.update(self.proxy_headers)
# Must keep the exception bound to a separate variable or else
Python 3
# complains about UnboundLocalError.
err = None
try:
# Request a connection from the queue.
timeout_obj = self._get_timeout(timeout)
conn = self._get_conn(timeout=pool_timeout)
conn.timeout = timeout_obj.connect_timeout
is_new_proxy_conn = self.proxy is not None and not
getattr(conn, 'sock', None)
if is_new_proxy_conn:
self._prepare_proxy(conn)
# Make the request on the httplib connection object.
httplib_response = self._make_request(conn, method, url,
timeout=timeout_obj,
body=body,
headers=headers)
# If we're going to release the connection in
``finally:``, then
# the request doesn't need to know about the connection.
Otherwise
# it will also try to release it and we'll have a
double-release
# mess.
response_conn = not release_conn and conn
# Import httplib's response into our own wrapper object
response = HTTPResponse.from_httplib(httplib_response,
pool=self,
connection=response_conn,
**response_kw)
# else:
# The connection will be put back into the pool when
# ``response.release_conn()`` is called (implicitly by
# ``response.read()``)
except Empty:
# Timed out by queue.
raise EmptyPoolError(self, "No pool connections are
available.")
except (BaseSSLError, CertificateError) as e:
# Close the connection. If a connection is reused on which
there
# was a Certificate error, the next request will certainly
raise
# another Certificate error.
if conn:
conn.close()
conn = None
raise SSLError(e)
except SSLError:
# Treat SSLError separately from BaseSSLError to preserve
# traceback.
if conn:
conn.close()
conn = None
raise
except (TimeoutError, HTTPException, SocketError, ConnectionError)
as e:
if conn:
# Discard the connection for these exceptions. It will be
# be replaced during the next _get_conn() call.
conn.close()
conn = None
if isinstance(e, SocketError) and self.proxy:
e = ProxyError('Cannot connect to proxy.', e)
elif isinstance(e, (SocketError, HTTPException)):
e = ProtocolError('Connection aborted.', e)
retries = retries.increment(method, url, error=e, _pool=self,
_stacktrace=sys.exc_info()[2])
retries.sleep()
# Keep track of the error for the retry warning.
err = e
finally:
if release_conn:
# Put the connection back to be reused. If the connection
is
# expired then it will be None, which will get replaced
with a
# fresh connection during _get_conn.
self._put_conn(conn)
if not conn:
# Try again
log.warning("Retrying (%r) after connection "
"broken by '%r': %s" %
(retries, err, url))
return self.urlopen(method, url, body, headers, retries,
redirect, assert_same_host,
timeout=timeout, pool_timeout=pool_timeout,
release_conn=release_conn, **response_kw)
# Handle redirect?
redirect_location = redirect and response.get_redirect_location()
if redirect_location:
if response.status == 303:
method = 'GET'
try:
retries = retries.increment(method, url, response=response,
_pool=self)
except MaxRetryError:
if retries.raise_on_redirect:
raise
return response
log.info("Redirecting %s -> %s" % (url,
redirect_location))
return self.urlopen(method, redirect_location, body, headers,
retries=retries, redirect=redirect,
assert_same_host=assert_same_host,
timeout=timeout, pool_timeout=pool_timeout,
release_conn=release_conn, **response_kw)
# Check if we should retry the HTTP response.
if retries.is_forced_retry(method, status_code=response.status):
retries = retries.increment(method, url, response=response,
_pool=self)
retries.sleep()
log.info("Forced retry: %s" % url)
return self.urlopen(method, url, body, headers,
retries=retries, redirect=redirect,
assert_same_host=assert_same_host,
timeout=timeout, pool_timeout=pool_timeout,
release_conn=release_conn, **response_kw)
return response
class HTTPSConnectionPool(HTTPConnectionPool):
"""
Same as :class:`.HTTPConnectionPool`, but HTTPS.
When Python is compiled with the :mod:`ssl` module, then
:class:`.VerifiedHTTPSConnection` is used, which *can* verify
certificates,
instead of :class:`.HTTPSConnection`.
:class:`.VerifiedHTTPSConnection` uses one of ``assert_fingerprint``,
``assert_hostname`` and ``host`` in this order to verify connections.
If ``assert_hostname`` is False, no verification is done.
The ``key_file``, ``cert_file``, ``cert_reqs``, ``ca_certs`` and
``ssl_version`` are only used if :mod:`ssl` is available and are fed
into
:meth:`urllib3.util.ssl_wrap_socket` to upgrade the connection socket
into an SSL socket.
"""
scheme = 'https'
ConnectionCls = HTTPSConnection
def __init__(self, host, port=None,
strict=False, timeout=Timeout.DEFAULT_TIMEOUT, maxsize=1,
block=False, headers=None, retries=None,
_proxy=None, _proxy_headers=None,
key_file=None, cert_file=None,
cert_reqs='CERT_REQUIRED',
ca_certs='/etc/ssl/certs/ca-bundle.crt',
ssl_version=None,
assert_hostname=None, assert_fingerprint=None,
**conn_kw):
HTTPConnectionPool.__init__(self, host, port, strict, timeout,
maxsize,
block, headers, retries, _proxy,
_proxy_headers,
**conn_kw)
self.key_file = key_file
self.cert_file = cert_file
self.cert_reqs = cert_reqs
self.ca_certs = ca_certs
self.ssl_version = ssl_version
self.assert_hostname = assert_hostname
self.assert_fingerprint = assert_fingerprint
def _prepare_conn(self, conn):
"""
Prepare the ``connection`` for :meth:`urllib3.util.ssl_wrap_socket`
and establish the tunnel if proxy is used.
"""
if isinstance(conn, VerifiedHTTPSConnection):
conn.set_cert(key_file=self.key_file,
cert_file=self.cert_file,
cert_reqs=self.cert_reqs,
ca_certs=self.ca_certs,
assert_hostname=self.assert_hostname,
assert_fingerprint=self.assert_fingerprint)
conn.ssl_version = self.ssl_version
return conn
def _prepare_proxy(self, conn):
"""
Establish tunnel connection early, because otherwise httplib
would improperly set Host: header to proxy's IP:port.
"""
# Python 2.7+
try:
set_tunnel = conn.set_tunnel
except AttributeError: # Platform-specific: Python 2.6
set_tunnel = conn._set_tunnel
if sys.version_info <= (2, 6, 4) and not self.proxy_headers: #
Python 2.6.4 and older
set_tunnel(self.host, self.port)
else:
set_tunnel(self.host, self.port, self.proxy_headers)
conn.connect()
def _new_conn(self):
"""
Return a fresh :class:`httplib.HTTPSConnection`.
"""
self.num_connections += 1
log.info("Starting new HTTPS connection (%d): %s"
% (self.num_connections, self.host))
if not self.ConnectionCls or self.ConnectionCls is DummyConnection:
# Platform-specific: Python without ssl
raise SSLError("Can't connect to HTTPS URL because
the SSL "
"module is not available.")
actual_host = self.host
actual_port = self.port
if self.proxy is not None:
actual_host = self.proxy.host
actual_port = self.proxy.port
conn = self.ConnectionCls(host=actual_host, port=actual_port,
timeout=self.timeout.connect_timeout,
strict=self.strict, **self.conn_kw)
return self._prepare_conn(conn)
def _validate_conn(self, conn):
"""
Called right before a request is made, after the socket is created.
"""
super(HTTPSConnectionPool, self)._validate_conn(conn)
# Force connect early to allow us to validate the connection.
if not getattr(conn, 'sock', None): # AppEngine might
not have `.sock`
conn.connect()
if not conn.is_verified:
warnings.warn((
'Unverified HTTPS request is being made. '
'Adding certificate verification is strongly advised.
See: '
'https://urllib3.readthedocs.org/en/latest/security.html'),
InsecureRequestWarning)
def connection_from_url(url, **kw):
"""
Given a url, return an :class:`.ConnectionPool` instance of its host.
This is a shortcut for not having to parse out the scheme, host, and
port
of the url before creating an :class:`.ConnectionPool` instance.
:param url:
Absolute URL string that must include the scheme. Port is optional.
:param \**kw:
Passes additional parameters to the constructor of the appropriate
:class:`.ConnectionPool`. Useful for specifying things like
timeout, maxsize, headers, etc.
Example::
>>> conn =
connection_from_url('http://google.com/')
>>> r = conn.request('GET', '/')
"""
scheme, host, port = get_host(url)
if scheme == 'https':
return HTTPSConnectionPool(host, port=port, **kw)
else:
return HTTPConnectionPool(host, port=port, **kw)