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# -*- coding: utf-8 -*- """The implementation of the SocketOptionsAdapter.""" import socket import warnings import sys import requests from requests import adapters from .._compat import connection from .._compat import poolmanager from .. import exceptions as exc class SocketOptionsAdapter(adapters.HTTPAdapter): """An adapter for requests that allows users to specify socket options. Since version 2.4.0 of requests, it is possible to specify a custom list of socket options that need to be set before establishing the connection. Example usage:: >>> import socket >>> import requests >>> from requests_toolbelt.adapters import socket_options >>> s = requests.Session() >>> opts = [(socket.IPPROTO_TCP, socket.TCP_NODELAY, 0)] >>> adapter = socket_options.SocketOptionsAdapter(socket_options=opts) >>> s.mount('http://', adapter) You can also take advantage of the list of default options on this class to keep using the original options in addition to your custom options. In that case, ``opts`` might look like:: >>> opts = socket_options.SocketOptionsAdapter.default_options + opts """ if connection is not None: default_options = getattr( connection.HTTPConnection, 'default_socket_options', [(socket.IPPROTO_TCP, socket.TCP_NODELAY, 1)] ) else: default_options = [] warnings.warn(exc.RequestsVersionTooOld, "This version of Requests is only compatible with a " "version of urllib3 which is too old to support " "setting options on a socket. This adapter is " "functionally useless.") def __init__(self, **kwargs): self.socket_options = kwargs.pop('socket_options', self.default_options) super(SocketOptionsAdapter, self).__init__(**kwargs) def init_poolmanager(self, connections, maxsize, block=False): if requests.__build__ >= 0x020400: # NOTE(Ian): Perhaps we should raise a warning self.poolmanager = poolmanager.PoolManager( num_pools=connections, maxsize=maxsize, block=block, socket_options=self.socket_options ) else: super(SocketOptionsAdapter, self).init_poolmanager( connections, maxsize, block ) class TCPKeepAliveAdapter(SocketOptionsAdapter): """An adapter for requests that turns on TCP Keep-Alive by default. The adapter sets 4 socket options: - ``SOL_SOCKET`` ``SO_KEEPALIVE`` - This turns on TCP Keep-Alive - ``IPPROTO_TCP`` ``TCP_KEEPINTVL`` 20 - Sets the keep alive interval - ``IPPROTO_TCP`` ``TCP_KEEPCNT`` 5 - Sets the number of keep alive probes - ``IPPROTO_TCP`` ``TCP_KEEPIDLE`` 60 - Sets the keep alive time if the socket library has the ``TCP_KEEPIDLE`` constant The latter three can be overridden by keyword arguments (respectively): - ``idle`` - ``interval`` - ``count`` You can use this adapter like so:: >>> from requests_toolbelt.adapters import socket_options >>> tcp = socket_options.TCPKeepAliveAdapter(idle=120, interval=10) >>> s = requests.Session() >>> s.mount('http://', tcp) """ def __init__(self, **kwargs): socket_options = kwargs.pop('socket_options', SocketOptionsAdapter.default_options) idle = kwargs.pop('idle', 60) interval = kwargs.pop('interval', 20) count = kwargs.pop('count', 5) socket_options = socket_options + [ (socket.SOL_SOCKET, socket.SO_KEEPALIVE, 1) ] # NOTE(Ian): OSX does not have these constants defined, so we # set them conditionally. if getattr(socket, 'TCP_KEEPINTVL', None) is not None: socket_options += [(socket.IPPROTO_TCP, socket.TCP_KEEPINTVL, interval)] elif sys.platform == 'darwin': # On OSX, TCP_KEEPALIVE from netinet/tcp.h is not exported # by python's socket module TCP_KEEPALIVE = getattr(socket, 'TCP_KEEPALIVE', 0x10) socket_options += [(socket.IPPROTO_TCP, TCP_KEEPALIVE, interval)] if getattr(socket, 'TCP_KEEPCNT', None) is not None: socket_options += [(socket.IPPROTO_TCP, socket.TCP_KEEPCNT, count)] if getattr(socket, 'TCP_KEEPIDLE', None) is not None: socket_options += [(socket.IPPROTO_TCP, socket.TCP_KEEPIDLE, idle)] super(TCPKeepAliveAdapter, self).__init__( socket_options=socket_options, **kwargs )
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