Monday, July 28, 2008

using libcurl, pycurl on for xml post

I had to do an xml call to get data from a remote server. it had to be a post request.
This is a simple example of using PycURL (pycurl) to access the libcurl library. I had been doing a python popen3() call to '/usr/bin/curl' and passing the params. This was ugly. A co-worker recommended pycurl. So, here it is, the sample code:

c = pycurl.Curl()
c.setopt(pycurl.URL, ncServerURL)
c.setopt(pycurl.POST, 1)
c.setopt(pycurl.HTTPHEADER, ["Content-type: text/xml"])
c.setopt(pycurl.TIMEOUT, ncServerMaxTime)
c.setopt(pycurl.CONNECTTIMEOUT, ncServerMaxTime)
c.setopt(pycurl.NOSIGNAL, 1) # disable signals, curl will be using other means besides signals to timeout.
c.setopt(pycurl.POSTFIELDS, xmlRequest)
import StringIO
b = StringIO.StringIO()
c.setopt(pycurl.WRITEFUNCTION, b.write)
ncServerData = b.getvalue()

This would only work after I installed pycurl. However, I'm running this on Ubuntu Hardy Heron, and Hardy wanted apt-get to install libcurl version 7.18.0. But pycurl wanted version 7.18.2 minimum. So, I had to go back a version on pycurl. Recommendation: hand-install pycurl version 7.16.4 (the one previous to 7.18.1) and it will work.

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