Customizing Python httplib - Revision history

PeterHarding at 04:06, 1 August 2015

2015-08-01T04:06:02Z

← Older revision		Revision as of 14:06, 1 August 2015
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	[[Category:Python]]		[[Category:Python]]
	[[Category:. httplib]]		[[Category:Python httplib]]

PeterHarding at 06:03, 12 November 2008

2008-11-12T06:03:45Z

← Older revision		Revision as of 16:03, 12 November 2008
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	# any socket newly created after this call with have an initial timeout 5 s		# any socket newly created after this call with have an initial timeout 5 s
	</pre>		</pre>

			[[Category:Python]]
			[[Category:. httplib]]

PeterHarding: /* setdefaulttimeout */

2008-03-17T06:37:46Z

setdefaulttimeout

← Older revision		Revision as of 16:37, 17 March 2008
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	Maybe, it is time to learn about Python's self documenting feature:		Maybe, it is time to learn about Python's self documenting feature:

	from socket import setdefaulttimeout		<pre>
	help(setdefaulttimeout)		from socket import setdefaulttimeout
			help(setdefaulttimeout)
			</pre>

	Help on built-in function setdefaulttimeout in module _socket:		Help on built-in function setdefaulttimeout in module _socket:

	setdefaulttimeout(...)		<pre>
	setdefaulttimeout(timeout)		setdefaulttimeout(...)
			setdefaulttimeout(timeout)
	~~Set the default timeout in floating seconds for new socket objects.~~
	~~A value of None indicates that new socket objects have no timeout.~~
	~~When the socket module is first imported, the default is None.~~

			Set the default timeout in floating seconds for new socket objects.
			A value of None indicates that new socket objects have no timeout.
			When the socket module is first imported, the default is None.
			</pre>

	This means:		This means:

			<pre>
	# you import 'setdefaulttimeout'		# you import 'setdefaulttimeout'
	from socket import setdefaulttimeout		from socket import setdefaulttimeout
Line 67:		Line 71:
	setdefaulttimeout(5)		setdefaulttimeout(5)
	# any socket newly created after this call with have an initial timeout 5 s		# any socket newly created after this call with have an initial timeout 5 s
			</pre>

PeterHarding at 06:36, 17 March 2008

2008-03-17T06:36:20Z

← Older revision		Revision as of 16:36, 17 March 2008
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	- Dieter Maurer [dieter@handshake.de]		- Dieter Maurer [dieter@handshake.de]

			=setdefaulttimeout=

			Maybe, it is time to learn about Python's self documenting feature:

			from socket import setdefaulttimeout
			help(setdefaulttimeout)

			Help on built-in function setdefaulttimeout in module _socket:

			setdefaulttimeout(...)
			setdefaulttimeout(timeout)

			Set the default timeout in floating seconds for new socket objects.
			A value of None indicates that new socket objects have no timeout.
			When the socket module is first imported, the default is None.


			This means:

			# you import 'setdefaulttimeout'
			from socket import setdefaulttimeout
			# then you call it with your timeout, e.g. 5 s
			setdefaulttimeout(5)
			# any socket newly created after this call with have an initial timeout 5 s

PeterHarding: New page: =Introduction= Here are some notes I have come across which relate to different customizations of ''httplib''. ==Customizing Socket Timeouts== Today, I have read in other messages in th...

2008-03-17T00:34:08Z

New page: =Introduction= Here are some notes I have come across which relate to different customizations of ''httplib''. ==Customizing Socket Timeouts== Today, I have read in other messages in th...

New page

=Introduction=

Here are some notes I have come across which relate to different customizations of ''httplib''.

==Customizing Socket Timeouts==

Today, I have read in other messages in this mailing list that ZSI uses "httplib" and in what ZSI parts customizations
to "httplib" need to be incorporated (--> see the thread about "http proxy" use).

To ensure, that "httplib.HTTP" uses sockets with a given timeout, you give it a non standard "_connection_class".
When you do not want to modify the behaviour of "HTTP" globally, you make a derived class and use this instead of
"HTTP" in ZSI.

An adequate connection class could look like "HTTPConnectionWithTimeout" below:

<pre>
from httplib import HTTPConnection
import socket

from dm.reuse import rebindFunction

class _SocketWrapper(object):
'''a (very partial) emulation of 'socket' with just the 'socket' attribute.'''
def __init__(self, timeout):
self.timeout = timeout

def socket(self, *args, **kw):
sock = socket.socket(*args, **kw):
if self.timeout: sock.settimeout(self.timeout)
return sock

class HTTPConnectionWithTimeout(HTTPConnection):
connect = rebindFunction(HTTPConnection.connect,
socket=_SocketWrapper(<your timeout>)

</pre>

You find "dm.reuse" on "PyPI". It is easier to install when you have "setuptools" installed.

If you do not want to install "dm.reuse", you can copy the "connect" method and add the "sock.settimeout" call in your copy.

- Dieter Maurer [dieter@handshake.de]