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# -*- coding: utf-8 -*-
"""
requests_toolbelt.source_adapter
================================
This file contains an implementation of the SourceAddressAdapter originally
demonstrated on the Requests GitHub page.
"""
from requests.adapters import HTTPAdapter
from .._compat import poolmanager, basestring
class SourceAddressAdapter(HTTPAdapter):
"""
A Source Address Adapter for Python Requests that enables you to choose the
local address to bind to. This allows you to send your HTTP requests from a
specific interface and IP address.
Two address formats are accepted. The first is a string: this will set the
local IP address to the address given in the string, and will also choose a
semi-random high port for the local port number.
The second is a two-tuple of the form (ip address, port): for example,
``('10.10.10.10', 8999)``. This will set the local IP address to the first
element, and the local port to the second element. If ``0`` is used as the
port number, a semi-random high port will be selected.
.. warning:: Setting an explicit local port can have negative interactions
with connection-pooling in Requests: in particular, it risks
the possibility of getting "Address in use" errors. The
string-only argument is generally preferred to the tuple-form.
Example usage:
.. code-block:: python
import requests
from requests_toolbelt.adapters.source import SourceAddressAdapter
s = requests.Session()
s.mount('http://', SourceAddressAdapter('10.10.10.10'))
s.mount('https://', SourceAddressAdapter(('10.10.10.10', 8999))
"""
def __init__(self, source_address, **kwargs):
if isinstance(source_address, basestring):
self.source_address = (source_address, 0)
elif isinstance(source_address, tuple):
self.source_address = source_address
else:
raise TypeError(
"source_address must be IP address string or (ip, port) tuple"
)
super(SourceAddressAdapter, self).__init__(**kwargs)
def init_poolmanager(self, connections, maxsize, block=False):
self.poolmanager = poolmanager.PoolManager(
num_pools=connections,
maxsize=maxsize,
block=block,
source_address=self.source_address)
def proxy_manager_for(self, *args, **kwargs):
kwargs['source_address'] = self.source_address
return super(SourceAddressAdapter, self).proxy_manager_for(
*args, **kwargs)
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