how to output log info in a python cgi file?

Question

I am using cgi (python) as a proxy to solve cross-domain issue of ajax request. i want to log some key info of each request, such as url, and save these info to a file on server. what should I do? I tried python logging module or File I/O module, neither seems work in this environment.

#!C:/Python25/python.exe -u

import urllib2
import cgi
import sys, os

f = open("./proxy.txt","a")

method = os.environ["REQUEST_METHOD"]
f.write(method + "\n")
if method == "POST":
    qs = os.environ["QUERY_STRING"]
    d = cgi.parse_qs(qs)
    if d.has_key("url"):
        url = d["url"][0]

else:
    fs = cgi.FieldStorage()
    url = fs.getvalue('url')

try:
    y = urllib2.urlopen(url)
f.write(url + "\n")
f.close()
except Exception, E:
    print "Status: 500 Unexpected Error"
    print "Content-Type: text/plain"
    print 
    print "Some unexpected error occurred. Error text was:", E

the proxy.txt file is still blank after request from client-end...

i tried File I/O lib and logging module, didn't get any error, but neither could make log file get any content... — Simon
– Simon, Commented Oct 14, 2011 at 5:24
Then please show example code using the logging module (for example), to allow effective diagnosis of the problem. — Vinay Sajip
– Vinay Sajip, Commented Oct 14, 2011 at 16:27

ed. · Accepted Answer · 2011-10-14 12:00:46Z

1

It's probably a combination of using a relative path and file permissions...

Try changing this line:

f = open("./proxy.txt","a")

to an absolute path, e.g.

f = open("C:\Users\foo\Desktop\proxy.txt","a")

Make sure that the effective user running the cgi script has permission to write to the absolute path you choose...

answered Oct 14, 2011 at 12:00

ed.

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2 Comments

Simon Over a year ago

thanks for your nice reply. in terms of permission, since this is a browser request, how could the app determine whether this browser request has the permission or not?

ed. Over a year ago

The app must be running as one effective user or another. That user needs to be able to write to the output file.

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