Python file sending correct way? (urllib2, PyCurl).

Question

Hello! My problem is the python sending to a controller which works with a prepared html sending script. Here the problem is that upload does not succeed (doesn't even start uploading) although the script runs through. The file is a binary container file. The problem should be in the code, because other way the upload could be completed

Here the output:

09:54:40:11     ...STEP: Upload Firmware
09:54:49:63     ...Upload was successful!
09:54:49:64     ...POST resource
09:54:50:60     ...Response: {"uploadFirmwareAck":0}

So the upload "was done" it says within 9 sec but it should take about 5 minutes. With debugger I monitored that it did not start just jump over it and give the "Upload was successful" message. I have no clue why. Any ideas?

The code:

import pycurl  
from cStringIO import StringIO
import urllib2
import simplejson as json

url = 'http://eData/pvi?rName=FirmwareUpload'
req = urllib2.Request(url)
req.add_header('Content-Type','application/json')

c = pycurl.Curl()
c.setopt(c.POST, 1)
c.setopt(c.URL, url)
c.setopt(c.CONNECTTIMEOUT,0)
c.setopt(c.TIMEOUT, 0)
c.setopt(pycurl.FOLLOWLOCATION, 1)
c.setopt(pycurl.MAXREDIRS, 5)
c.setopt(pycurl.NOSIGNAL, 1)

c.setopt(c.HTTPPOST, [("file1", (c.FORM_FILE, "c:\\Users\\dem2bp\\Desktop\\HMI_Firmware update materials\\output_38.efc"))])

c.perform()
print "Upload was successful!"
print "Tx JSON:"
print "POST resource"
res = urllib2.urlopen(req)
print "Response:"
str_0 = res.read()

print str_0
c.close()

Answer 1

From the documentation:

PycURL is targeted at an advanced developer - if you need dozens of concurrent, fast and reliable connections or any of the sophisticated features listed above then PycURL is for you.

I would give http://www.python-requests.org/en/latest/ a try. For me, it's always the first choice when doing some http stuff. Usually it just does what it' supposed to do in a few lines of code.

Answer 2

Thank you, but as I see this request library does not run with an old version of Python like 2.6. I think it would be too risky to upgrade. Do you have other idea? When I import requests library at some point of library which requires later versions throw me synthax errors.