Re: Problem configuring apache to run python cgi on Ubuntu 14.04

[Chris Angelico]

On Tue, Sep 22, 2015 at 7:36 AM,   wrote:
> Thank you very much. Can I write .py pages like in PHP or should I
> use a framework like Django, Web2py or TurboGears?

I recommend using WSGI and a framework that uses it (my personal
preference is Flask, but the above will also work). Here are a couple
of simple sites:

https://github.com/Rosuav/Flask1
https://github.com/Rosuav/MinstrelHall

You can see them in operation here:

http://rosuav.com/1/
http://minstrelhall.com/

Note how URLs are defined in the code, rather than by having a bunch
of loose files (the way a PHP web site works). This makes it a lot
easier to group things logically, and utility lines like redirects
become very cheap. The maintenance burden is far lighter with this
kind of one-file arrangement.

These sites are really tiny, though, so if you have something a bit
bigger, you'll probably want to split things into multiple files. Good
news! You can do that, too - it's easy enough to split on any boundary
you find logical.

ChrisA
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Re: Problem configuring apache to run python cgi on Ubuntu 14.04

[alister]

On Mon, 21 Sep 2015 12:51:09 -0700, tropical.dude.net wrote:

> On Monday, September 21, 2015 at 9:47:33 PM UTC+2, tropical...@gmail.com
> wrote:
>> On Monday, September 21, 2015 at 9:41:29 PM UTC+2, John Gordon wrote:
>> > In <44e870a7-9567-40ba-8a65-d6b52a8c5...@googlegroups.com>
>> > tropical.dude@gmail.com writes:
>> > 
>> > > print("Content-Type: text/html;charset=utf-8")
>> > > print("Hello World!")
>> > 
>> > As I recall, you must have a blank line between the headers and the
>> > content.
>> > 
>> > But that may or may not be your problem, as you haven't told us
>> > exactly what is going wrong.
>> > 
>> > --
>> > John Gordon   A is for Amy, who fell down the stairs
>> > gor...@panix.com  B is for Basil, assaulted by bears
>> > -- Edward Gorey, "The Gashlycrumb
>> > Tinies"
>> 
>> I am new to Ubuntu, is there a command so I can find out what the
>> problem is?
> 
> The only error I can see right now is forbedden, you don't have
> permission to access /index.py on this server.

this is not a linux permissions error it is an error with the apache 
configuration you need to check roe acache config files
(you may also want to investigate WSGI as CGI is outdated) 



-- 
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- C. N. Parkinson
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Re: Problem configuring apache to run python cgi on Ubuntu 14.04

[sohcahtoa82]

On Monday, September 21, 2015 at 11:41:54 AM UTC-7, tropical...@gmail.com wrote:
> Hello everybody,
> 
> I installed the LAMP stack on in Ubuntu, but I am having
> problems configuring Apache to run python CGI scripts.
> 
> I ran:
> sudo a2enmod cgi
> 
> I added to apache2.conf
> 
> Options +ExecCGI
> AddHandler cgi-script .py
> 
> 
> I created index.py:
> #!/usr/bin/env python
> # -*- coding: UTF-8 -*-# enable debugging
> import cgitb
> 
> cgitb.enable()
> print("Content-Type: text/html;charset=utf-8")
> print("Hello World!")
> 
> But it is still not working.
> 
> Can anybody help me out?
> 
> Thanks in advance.

"It isn't working" is about as useful as telling a mechanic "My car doesn't 
work" without giving details on what exactly is happening.

What exactly isn't working?  What error message are you getting?

The first thing I would check is to make sure the permissions on index.py are 
set to allow execution.  It is easy to forget to do that.
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Re: Problem configuring apache to run python cgi on Ubuntu 14.04

[Albert Visser]

On Mon, 21 Sep 2015 20:41:13 +0200,  wrote:


Hello everybody,


(...)


I created index.py:
#!/usr/bin/env python
# -*- coding: UTF-8 -*-# enable debugging
import cgitb

cgitb.enable()
print("Content-Type: text/html;charset=utf-8")
print("Hello World!")

But it is still not working.

Can anybody help me out?

Thanks in advance.


Which Python are you running? If it's Python 3, change the shebang  
accordingly because "python" is assuming Python 2.


--
Vriendelijke groeten / Kind regards,

Albert Visser

Using Opera's mail client: http://www.opera.com/mail/
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Re: Problem configuring apache to run python cgi on Ubuntu 14.04

[tropical . dude . net]

On Monday, September 21, 2015 at 9:30:11 PM UTC+2, Albert Visser wrote:
> On Mon, 21 Sep 2015 20:41:13 +0200,  wrote:
> 
> > Hello everybody,
> >
> (...)
> >
> > I created index.py:
> > #!/usr/bin/env python
> > # -*- coding: UTF-8 -*-# enable debugging
> > import cgitb
> >
> > cgitb.enable()
> > print("Content-Type: text/html;charset=utf-8")
> > print("Hello World!")
> >
> > But it is still not working.
> >
> > Can anybody help me out?
> >
> > Thanks in advance.
> 
> Which Python are you running? If it's Python 3, change the shebang  
> accordingly because "python" is assuming Python 2.
> 
> -- 
> Vriendelijke groeten / Kind regards,
> 
> Albert Visser
> 
> Using Opera's mail client: http://www.opera.com/mail/

I am running python3.4
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Re: Problem configuring apache to run python cgi on Ubuntu 14.04

[tropical . dude . net]

On Monday, September 21, 2015 at 9:20:22 PM UTC+2, sohca...@gmail.com wrote:
> On Monday, September 21, 2015 at 11:41:54 AM UTC-7, tropical...@gmail.com 
> wrote:
> > Hello everybody,
> > 
> > I installed the LAMP stack on in Ubuntu, but I am having
> > problems configuring Apache to run python CGI scripts.
> > 
> > I ran:
> > sudo a2enmod cgi
> > 
> > I added to apache2.conf
> > 
> > Options +ExecCGI
> > AddHandler cgi-script .py
> > 
> > 
> > I created index.py:
> > #!/usr/bin/env python
> > # -*- coding: UTF-8 -*-# enable debugging
> > import cgitb
> > 
> > cgitb.enable()
> > print("Content-Type: text/html;charset=utf-8")
> > print("Hello World!")
> > 
> > But it is still not working.
> > 
> > Can anybody help me out?
> > 
> > Thanks in advance.
> 
> "It isn't working" is about as useful as telling a mechanic "My car doesn't 
> work" without giving details on what exactly is happening.
> 
> What exactly isn't working?  What error message are you getting?
> 
> The first thing I would check is to make sure the permissions on index.py are 
> set to allow execution.  It is easy to forget to do that.

The error message that I am receiving in my browser is:
403: You don't have permission to access /index.py on this server.

The permissions of index.py is 755
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Re: Problem configuring apache to run python cgi on Ubuntu 14.04

[John Gordon]

In <44e870a7-9567-40ba-8a65-d6b52a8c5...@googlegroups.com> 
tropical.dude@gmail.com writes:

> print("Content-Type: text/html;charset=utf-8")
> print("Hello World!")

As I recall, you must have a blank line between the headers and the
content.

But that may or may not be your problem, as you haven't told us exactly
what is going wrong.

-- 
John Gordon   A is for Amy, who fell down the stairs
gor...@panix.com  B is for Basil, assaulted by bears
-- Edward Gorey, "The Gashlycrumb Tinies"

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Re: Problem configuring apache to run python cgi on Ubuntu 14.04

[tropical . dude . net]

On Monday, September 21, 2015 at 9:41:29 PM UTC+2, John Gordon wrote:
> In <44e870a7-9567-40ba-8a65-d6b52a8c5...@googlegroups.com> 
> tropical.dude@gmail.com writes:
> 
> > print("Content-Type: text/html;charset=utf-8")
> > print("Hello World!")
> 
> As I recall, you must have a blank line between the headers and the
> content.
> 
> But that may or may not be your problem, as you haven't told us exactly
> what is going wrong.
> 
> -- 
> John Gordon   A is for Amy, who fell down the stairs
> gor...@panix.com  B is for Basil, assaulted by bears
> -- Edward Gorey, "The Gashlycrumb Tinies"

I am new to Ubuntu, is there a command so I can find out what the problem is?
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Re: Problem configuring apache to run python cgi on Ubuntu 14.04

[tropical . dude . net]

On Monday, September 21, 2015 at 9:47:33 PM UTC+2, tropical...@gmail.com wrote:
> On Monday, September 21, 2015 at 9:41:29 PM UTC+2, John Gordon wrote:
> > In <44e870a7-9567-40ba-8a65-d6b52a8c5...@googlegroups.com> 
> > tropical.dude@gmail.com writes:
> > 
> > > print("Content-Type: text/html;charset=utf-8")
> > > print("Hello World!")
> > 
> > As I recall, you must have a blank line between the headers and the
> > content.
> > 
> > But that may or may not be your problem, as you haven't told us exactly
> > what is going wrong.
> > 
> > -- 
> > John Gordon   A is for Amy, who fell down the stairs
> > gor...@panix.com  B is for Basil, assaulted by bears
> > -- Edward Gorey, "The Gashlycrumb Tinies"
> 
> I am new to Ubuntu, is there a command so I can find out what the problem is?

The only error I can see right now is forbedden, you don't have permission to 
access /index.py on this server.
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Problem configuring apache to run python cgi on Ubuntu 14.04

[tropical . dude . net]

Hello everybody,

I installed the LAMP stack on in Ubuntu, but I am having
problems configuring Apache to run python CGI scripts.

I ran:
sudo a2enmod cgi

I added to apache2.conf

Options +ExecCGI
AddHandler cgi-script .py


I created index.py:
#!/usr/bin/env python
# -*- coding: UTF-8 -*-# enable debugging
import cgitb

cgitb.enable()
print("Content-Type: text/html;charset=utf-8")
print("Hello World!")

But it is still not working.

Can anybody help me out?

Thanks in advance.
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Re: Problem configuring apache to run python cgi on Ubuntu 14.04

[tropical . dude . net]

On Monday, September 21, 2015 at 10:29:48 PM UTC+2, alister wrote:
> On Mon, 21 Sep 2015 12:51:09 -0700, tropical.dude.net wrote:
> 
> > On Monday, September 21, 2015 at 9:47:33 PM UTC+2, tropical...@gmail.com
> > wrote:
> >> On Monday, September 21, 2015 at 9:41:29 PM UTC+2, John Gordon wrote:
> >> > In <44e870a7-9567-40ba-8a65-d6b52a8c5...@googlegroups.com>
> >> > tropical.dude@gmail.com writes:
> >> > 
> >> > > print("Content-Type: text/html;charset=utf-8")
> >> > > print("Hello World!")
> >> > 
> >> > As I recall, you must have a blank line between the headers and the
> >> > content.
> >> > 
> >> > But that may or may not be your problem, as you haven't told us
> >> > exactly what is going wrong.
> >> > 
> >> > --
> >> > John Gordon   A is for Amy, who fell down the stairs
> >> > gor...@panix.com  B is for Basil, assaulted by bears
> >> > -- Edward Gorey, "The Gashlycrumb
> >> > Tinies"
> >> 
> >> I am new to Ubuntu, is there a command so I can find out what the
> >> problem is?
> > 
> > The only error I can see right now is forbedden, you don't have
> > permission to access /index.py on this server.
> 
> this is not a linux permissions error it is an error with the apache 
> configuration you need to check roe acache config files
> (you may also want to investigate WSGI as CGI is outdated) 
> 
> 
> 
> -- 
> Perfection is acheived only on the point of collapse.
> - C. N. Parkinson

Thank you very much. Can I write .py pages like in PHP or should I
use a framework like Django, Web2py or TurboGears? 
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WSGI (was: Re: Python CGI)

[Christian]

On 05/20/2014 03:52 AM, Tim Chase wrote:
 While Burak addressed your (Fast-)CGI issues, once you have a
 test-script successfully giving you output, you can use the
 standard-library's getpass.getuser() function to tell who your script
 is running as.

LoadModule wsgi_module modules/mod_wsgi.so
AddHandler wsgi-script .wsgi
WSGIDaemonProcess myproj user=chris threads=3

[root@t-centos1 ~]# ps -ef|grep chris
chris 1201  1199  0 08:47 ?00:00:00 /usr/sbin/httpd

---8---
#!/usr/bin/python
import getpass
def application(environ, start_response):
status = '200 OK'
output = 'Hello World!'
output += getpass.getuser()
response_headers = [('Content-type', 'text/plain'),
('Content-Length', str(len(output)))]
start_response(status, response_headers)

return [output]
---8---

Hello World!root

Hmm, why is it root?

I'm using Apache and mod_userdir. Can I define WSGIDaemonProcess for
each user?

- Chris
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WSGI (was: Re: Python CGI)

[Chris]

On 05/20/2014 03:52 AM, Tim Chase wrote:
 While Burak addressed your (Fast-)CGI issues, once you have a
 test-script successfully giving you output, you can use the
 standard-library's getpass.getuser() function to tell who your script
 is running as.

LoadModule wsgi_module modules/mod_wsgi.so
AddHandler wsgi-script .wsgi
WSGIDaemonProcess myproj user=chris threads=3

[root@t-centos1 ~]# ps -ef|grep chris
chris 1201  1199  0 08:47 ?00:00:00 /usr/sbin/httpd

---8---
#!/usr/bin/python
import getpass
def application(environ, start_response):
status = '200 OK'
output = 'Hello World!'
output += getpass.getuser()
response_headers = [('Content-type', 'text/plain'),
('Content-Length', str(len(output)))]
start_response(status, response_headers)

return [output]
---8---

Hello World!root

Hmm, why is it root?

I'm using Apache and mod_userdir. Can I define WSGIDaemonProcess for
each user?

- Chris

-- 
Gruß,
Christian
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Re: WSGI (was: Re: Python CGI)

[alister]

On Sun, 25 May 2014 09:06:18 +0200, Chris wrote:

 On 05/20/2014 03:52 AM, Tim Chase wrote:
 While Burak addressed your (Fast-)CGI issues, once you have a
 test-script successfully giving you output, you can use the
 standard-library's getpass.getuser() function to tell who your script
 is running as.
 
 LoadModule wsgi_module modules/mod_wsgi.so AddHandler wsgi-script .wsgi
 WSGIDaemonProcess myproj user=chris threads=3
 
 [root@t-centos1 ~]# ps -ef|grep chris chris 1201  1199  0 08:47 ?   
 00:00:00 /usr/sbin/httpd
 
 ---8---
 #!/usr/bin/python import getpass def application(environ,
 start_response):
 status = '200 OK'
 output = 'Hello World!'
 output += getpass.getuser()
 response_headers = [('Content-type', 'text/plain'),
 ('Content-Length', str(len(output)))]
 start_response(status, response_headers)
 
 return [output]
 ---8---
 
 Hello World!root
 
 Hmm, why is it root?
 
 I'm using Apache and mod_userdir. Can I define WSGIDaemonProcess for
 each user?
 
 - Chris

is your apache server running as root?
if so it probably should be corrected


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Python CGI

[Christian]

Hi,

I'd like to use Python for CGI-Scripts. Is there a manual how to setup
Python with Fast-CGI? I'd like to make sure that Python scripts aren't
executed by www-user, but the user who wrote the script.

-- 
Gruß,
Christian
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Re: Python CGI

[Burak Arslan]

On 05/19/14 21:32, Christian wrote:
 Hi,

 I'd like to use Python for CGI-Scripts. Is there a manual how to setup
 Python with Fast-CGI?

Look for Mailman fastcgi guides.

Here's one for gentoo, but I imagine it'd be easily applicable to other
disros:
https://www.rfc1149.net/blog/2010/12/30/configuring-mailman-with-nginx-on-gentoo/

hth,
burak
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Re: Python CGI

[Tim Chase]

On 2014-05-19 20:32, Christian wrote:
 I'd like to use Python for CGI-Scripts. Is there a manual how to
 setup Python with Fast-CGI? I'd like to make sure that Python
 scripts aren't executed by www-user, but the user who wrote the
 script.

While Burak addressed your (Fast-)CGI issues, once you have a
test-script successfully giving you output, you can use the
standard-library's getpass.getuser() function to tell who your script
is running as.

-tkc


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Data transfer from Python CGI to javascript

[engg]

I have written the following program 
#!c:\Python27\Python.exe
import cgi, cgitb;
import sys, serial
cgitb.enable()
ser = serial.Serial('COM27', 9600)
myvar = ser.readline()
print Content-type:text/html\n\n
print 
html
head
title
Real Time Temperature
/title
  script type=text/javascript
window.onload = startInterval;
function startInterval()
{
setInterval(startTime();,1000);
}

function startTime(myvar)
{
document.getElementById('mine').innerHTML =Temperature 
+parseInt(myvar);

}
  /script
/head
body
h1Real Time Temperature:/h1
div id=mine/div
/body/html


It is giving an output of 'NaN' in the output. 
If the python program is run alone it is giving the correct output. 
Can anyone please help.
Is it also possible to separate the python and the javascript to two different 
files. If so how will I get/transfer the data in/from HTML . 
Thanks
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Re: Data transfer from Python CGI to javascript

[MRAB]

On 09/08/2013 07:53, e...@cleantechsolution.in wrote:

I have written the following program
#!c:\Python27\Python.exe
import cgi, cgitb;
import sys, serial
cgitb.enable()
ser = serial.Serial('COM27', 9600)
myvar = ser.readline()
print Content-type:text/html\n\n
print 
html
head
title
Real Time Temperature
/title
   script type=text/javascript
 window.onload = startInterval;
 function startInterval()
 {
 setInterval(startTime();,1000);
 }

 function startTime(myvar)
 {
 document.getElementById('mine').innerHTML =Temperature 
+parseInt(myvar);

 }
   /script
/head
body
h1Real Time Temperature:/h1
div id=mine/div
/body/html


It is giving an output of 'NaN' in the output.
If the python program is run alone it is giving the correct output.
Can anyone please help.
Is it also possible to separate the python and the javascript to two different 
files. If so how will I get/transfer the data in/from HTML .
Thanks


At a guess I'd say that it's because you have:

setInterval(startTime();,1000);

which will call 'startTime' with no arguments, but:

function startTime(myvar)

which means that it's expecting an argument.

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Problem with running python cgi scripts through my browser

[kreta06]

Dear Python Tutors,

I am having problems trying to send an email (using the smtplib module ) to
send an email to myself over my browser using a python script, which is
being called by an html form that I have created. My python cgi script is
located in my cgi-bin directory, which I had made sure that in my httpd
configuration, I had added the python extensions so that it can be run as a
cgi script over my browser. If I run my python script directly on the
commandline, I am able to send an email to myself and receive it.
However, when I try to do the same and run it from my html form, it doesn't
work. I'm sure I'm missing something here, but just can't figure out what.
My suspicions could be that to send an email over the browser requires a
specific format, which I could not figure out.
Below is my cgi script and errors that I get when I run the cgi script.

Any help would be appreciated.

Many thanks,
Sue


-
my script:

import cgi
import string,sys
import smtplib
import cgitb
cgitb.enable()
sys.stderr = sys.stdout


def main():
print Content-type: text/html\n
form = cgi.FieldStorage()
if form.has_key(firstname) and form[firstname].value != :
result = pName:  + form[firstname].value +
pFavorite Color(s):  + form[colors].value + pFavorite Drinks(s): 
+ str(form.getlist(drinks)) + pEmail:  + form[email].value
return result
else:
print Please enter your firstname!


TEXT = main()


FROM = myem...@gmail.com
TO = myem...@gmail.com
SUBJECT = Second try

# Prepare actual message

message = \
From: %s
To: %s
Subject: %s

%s
 % (FROM,,.join(TO), SUBJECT, TEXT)

# Send the mail
server2 = smtplib.SMTP(localhost)
server2.sendmail(FROM, TO, message)
server2.quit()

-

Error  I get:

 /usr/lib/python2.6/cgitb.py:173: DeprecationWarning: BaseException.message
has been deprecated as of Python 2.6 value =
pydoc.html.repr(getattr(evalue, name))

*class 'socket.error'*Python 2.6.6: /usr/bin/python
Fri Apr 20 15:13:06 2012

A problem occurred in a Python script. Here is the sequence of function
calls leading up to the error, in the order they occurred.
  /var/www/cgi-bin/action.py in **()37
38 # Send the mail
39 server2 = smtplib.SMTP(localhost)
40 server2.sendmail(FROM, TO, message)
41 server2.quit()
 server2 *undefined*, *smtplib* = module 'smtplib' from
'/usr/lib/python2.6/smtplib.pyc', smtplib.*SMTP* = class smtplib.SMTP
/usr/lib/python2.6/smtplib.py in *__init__*(self=smtplib.SMTP instance,
host='localhost', port=0, local_hostname=None, timeout=object object)
  237 self.default_port = SMTP_PORT
   238 if host:
   239 (code, msg) = self.connect(host, port)
   240 if code != 220:
   241 raise SMTPConnectError(code, msg)
 code *undefined*, msg *undefined*, *self* = smtplib.SMTP instance, self.*
connect* = bound method SMTP.connect of smtplib.SMTP instance, *host* =
'localhost', *port* = 0   /usr/lib/python2.6/smtplib.py in
*connect*(self=smtplib.SMTP
instance, host='localhost', port=25)   293
 if not port: port = self.default_port
   294
 if self.debuglevel  0: printstderr, 'connect:', (host, port)
   295 self.sock = self._get_socket(host, port, self.timeout)
   296 (code, msg) = self.getreply()
   297 if self.debuglevel  0: printstderr, connect:, msg
 *self* = smtplib.SMTP instance, self.sock *undefined*, self.*_get_socket* =
bound method SMTP._get_socket of smtplib.SMTP instance, *host* =
'localhost', *port* = 25, self.*timeout* = object object
/usr/lib/python2.6/smtplib.py in *_get_socket*(self=smtplib.SMTP
instance, port='localhost', host=25, timeout=object object)   271
 # and just alter the socket connection bit.
   272
 if self.debuglevel  0: printstderr, 'connect:', (host, port)
   273 return socket.create_connection((port, host), timeout)
   274
   275 def connect(self, host='localhost', port = 0):
 *global* *socket* = module 'socket' from
'/usr/lib/python2.6/socket.pyc', socket.*create_connection* = function
create_connection, *port* = 'localhost', *host* = 25, *timeout* = object
object   /usr/lib/python2.6/socket.py in
*create_connection*(address=('localhost',
25), timeout=object object)   563 except error, msg:
   564 if sock is not None:
   565 sock.close()
   566
   567 raise error, msg
 *global* *error* = class 'socket.error', *msg* = error(13, 'Permission
denied')

*class 'socket.error'*: [Errno 13] Permission denied
  args = (13, 'Permission denied')
  errno = 13
  filename = None
  message = ''
  strerror = 'Permission denied'
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RE: Python - CGI-BIN - Apache Timeout Problem

[Sean Cavanaugh (scavanau)]

Thanks Chris,

I isolated it using logging

import logging 
logging.basicConfig(filename=test3.log, level=logging.INFO)
then logging.info('sniffer got to point A')  

and going through my code until I isolated the problem to a function with scapy 
called sniff.  For some reason this function operates very weirdly on FreeBSD9. 
 I have already submitted an email to the scapy mailing list.  Going to try to 
replicate this on Fedora but I doubt I will see this problem.  Even from the 
command line the sniff() function is not working correctly on FreeBSD 9.

-S  

-Original Message-
From: ch...@rebertia.com [mailto:ch...@rebertia.com] On Behalf Of Chris Rebert
Sent: Friday, March 02, 2012 3:23 PM
To: Sean Cavanaugh (scavanau)
Cc: python-list@python.org
Subject: Re: Python - CGI-BIN - Apache Timeout Problem

On Fri, Mar 2, 2012 at 12:09 PM, Sean Cavanaugh (scavanau)
scava...@cisco.com wrote:
snip
 THE PROBLEM:

 When I execute the scripts from the command line (#python main.py) it
 generates it fine (albeit slowly), it prints all the html code out including
 the script.  The ‘core’ part of the script dumbed down to the lowest level
 is-

     proc = subprocess.Popen(['/usr/local/bin/python', 'tests.py'],
 stdout=subprocess.PIPE)
     output = proc.stdout.read()

Note the red warning box about possible deadlock with .stdout.read()
and friends:
http://docs.python.org/library/subprocess.html#popen-objects

     print output
     proc.stdout.close()

As the docs advise, try using .communicate()
[http://docs.python.org/library/subprocess.html#subprocess.Popen.communicate
] instead:
proc = subprocess.Popen(…)
out, err = proc.communicate()
print out

 When I open main.py and execute the script it just hangs… it seems to
 execute the script (I see pcap fires on the interface that I am testing on
 the firewall) but its not executing correctly… or loading the entire
 webpage…the webpage keeps chugging along and eventually gives me an error
 timeout.

The hanging makes me suspect that the aforementioned deadlock is occurring.

Cheers,
Chris
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Python - CGI-BIN - Apache Timeout Problem

[Sean Cavanaugh (scavanau)]

Hello List,

 

Would appreciate some insight/help, ran out of ideas...

 

BRIEF OVERVIEW:

 

I am trying to create a simple webserver gui wrapper for a set of
scripts I developed to test some of our firewalls here at Cisco.  Being
that the total amount of engineer that will ever probably use this is 4
people and my limited python experience I just decided to do a quick
cgi-bin solution.  I control the machine with the webserver on em0 where
I do my fw testing on em1/em2.

 

Browser goes to http://webserver/main.py- main.py executes a
script-tests.py -test.py imports my engine v6tester_main.py which is a
series of functions I wrote. tests.py kicks of whatever test main.py
wanted.  

 

THE PROBLEM:

 

When I execute the scripts from the command line (#python main.py) it
generates it fine (albeit slowly), it prints all the html code out
including the script.  The 'core' part of the script dumbed down to the
lowest level is-

 

proc = subprocess.Popen(['/usr/local/bin/python', 'tests.py'],
stdout=subprocess.PIPE)

output = proc.stdout.read()

print output

proc.stdout.close()

 

When I open main.py and execute the script it just hangs... it seems to
execute the script (I see pcap fires on the interface that I am testing
on the firewall) but its not executing correctly... or loading the
entire webpage...the webpage keeps chugging along and eventually gives
me an error timeout.

 

I know it's not a permissions issue or setup issue b/c I did a proof of
concept where I just fired one simple pcap and it works fine (reported
back just like it would if I ran it on the command line).. it has
something to do with either the amount of prints out the script is
doing, or the timing.  I see no problems except the timeout (nothing in
logs: /var/log/http-error.log).  My script takes about 8 secounds to
run.  It does use threading but I wouldn't think that would mess it up.

 

BTW: I posted here if this helps anyone:
http://stackoverflow.com/questions/9524758/cgi-bin-timing-timeout-on-fre
ebsd-apache22

 

 

Thanks in advance for any ideas.  I can include the whole main.py if
that would help.

 



Sean Cavanaugh

Cisco Systems

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Re: Python - CGI-BIN - Apache Timeout Problem

[Chris Rebert]

On Fri, Mar 2, 2012 at 12:09 PM, Sean Cavanaugh (scavanau)
scava...@cisco.com wrote:
snip
 THE PROBLEM:

 When I execute the scripts from the command line (#python main.py) it
 generates it fine (albeit slowly), it prints all the html code out including
 the script.  The ‘core’ part of the script dumbed down to the lowest level
 is-

     proc = subprocess.Popen(['/usr/local/bin/python', 'tests.py'],
 stdout=subprocess.PIPE)
     output = proc.stdout.read()

Note the red warning box about possible deadlock with .stdout.read()
and friends:
http://docs.python.org/library/subprocess.html#popen-objects

     print output
     proc.stdout.close()

As the docs advise, try using .communicate()
[http://docs.python.org/library/subprocess.html#subprocess.Popen.communicate
] instead:
proc = subprocess.Popen(…)
out, err = proc.communicate()
print out

 When I open main.py and execute the script it just hangs… it seems to
 execute the script (I see pcap fires on the interface that I am testing on
 the firewall) but its not executing correctly… or loading the entire
 webpage…the webpage keeps chugging along and eventually gives me an error
 timeout.

The hanging makes me suspect that the aforementioned deadlock is occurring.

Cheers,
Chris
--
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RE: Python - CGI-BIN - Apache Timeout Problem

[Sean Cavanaugh (scavanau)]

Hey Chris,

Thanks for your quick reply!  I switched my code to-

proc = subprocess.Popen(['/usr/local/bin/python', 'tests.py'], 
stdout=subprocess.PIPE)
out, err = proc.communicate()
print out
proc.stdout.close()

It still dead locked.  Interestingly enough When I did a #python tests.py on 
the command line even that was taking awhile to print out to the command line 
so I decided to restart my webserver... wow from mucking before something must 
have been running in the background still.  I got the script down to 2 seconds 
or so... 

Now it still works but faster when I do #python main.py it generates all the 
text to the command line but the website still hangs when I go to 
http://webserver/main.py... I am not sure what is going wrong... no error in 
the /var/log except for the eventual timeout after a couple minutes goes by.

-S

-Original Message-
From: ch...@rebertia.com [mailto:ch...@rebertia.com] On Behalf Of Chris Rebert
Sent: Friday, March 02, 2012 3:23 PM
To: Sean Cavanaugh (scavanau)
Cc: python-list@python.org
Subject: Re: Python - CGI-BIN - Apache Timeout Problem

On Fri, Mar 2, 2012 at 12:09 PM, Sean Cavanaugh (scavanau)
scava...@cisco.com wrote:
snip
 THE PROBLEM:

 When I execute the scripts from the command line (#python main.py) it
 generates it fine (albeit slowly), it prints all the html code out including
 the script.  The ‘core’ part of the script dumbed down to the lowest level
 is-

     proc = subprocess.Popen(['/usr/local/bin/python', 'tests.py'],
 stdout=subprocess.PIPE)
     output = proc.stdout.read()

Note the red warning box about possible deadlock with .stdout.read()
and friends:
http://docs.python.org/library/subprocess.html#popen-objects

     print output
     proc.stdout.close()

As the docs advise, try using .communicate()
[http://docs.python.org/library/subprocess.html#subprocess.Popen.communicate
] instead:
proc = subprocess.Popen(…)
out, err = proc.communicate()
print out

 When I open main.py and execute the script it just hangs… it seems to
 execute the script (I see pcap fires on the interface that I am testing on
 the firewall) but its not executing correctly… or loading the entire
 webpage…the webpage keeps chugging along and eventually gives me an error
 timeout.

The hanging makes me suspect that the aforementioned deadlock is occurring.

Cheers,
Chris
--
http://chrisrebert.com
-- 
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RE: Python - CGI-BIN - Apache Timeout Problem

[Sean Cavanaugh (scavanau)]

Hey All,

So maybe this part is important (after doing some troubleshooting)  hopefully 
not everyone has beers in hand already since its Friday :-) 

The way the code works if you want to send through the firewall (i.e.   
SERVER-FIREWALL-SERVER)  I split the process into two threads.  One is 
listening on the egress, then I send on the ingress.  The main waits until the 
thread finishes (it times out after 2 seconds).  I had to do this b/c scapy 
(the library I used) won't let me send pcaps while I receive them.  This lets 
me see packets on both sides (i.e. did that sort of internet traffic go through 
the firewall).   The reason I think this could be a problem is when I ran a 
test where I sent to the firewall (rather than through it) and my program does 
not need to thread the webserver works fine..   

Suggestions anyone?

-S

-Original Message-
From: ch...@rebertia.com [mailto:ch...@rebertia.com] On Behalf Of Chris Rebert
Sent: Friday, March 02, 2012 3:23 PM
To: Sean Cavanaugh (scavanau)
Cc: python-list@python.org
Subject: Re: Python - CGI-BIN - Apache Timeout Problem

On Fri, Mar 2, 2012 at 12:09 PM, Sean Cavanaugh (scavanau)
scava...@cisco.com wrote:
snip
 THE PROBLEM:

 When I execute the scripts from the command line (#python main.py) it
 generates it fine (albeit slowly), it prints all the html code out including
 the script.  The ‘core’ part of the script dumbed down to the lowest level
 is-

     proc = subprocess.Popen(['/usr/local/bin/python', 'tests.py'],
 stdout=subprocess.PIPE)
     output = proc.stdout.read()

Note the red warning box about possible deadlock with .stdout.read()
and friends:
http://docs.python.org/library/subprocess.html#popen-objects

     print output
     proc.stdout.close()

As the docs advise, try using .communicate()
[http://docs.python.org/library/subprocess.html#subprocess.Popen.communicate
] instead:
proc = subprocess.Popen(…)
out, err = proc.communicate()
print out

 When I open main.py and execute the script it just hangs… it seems to
 execute the script (I see pcap fires on the interface that I am testing on
 the firewall) but its not executing correctly… or loading the entire
 webpage…the webpage keeps chugging along and eventually gives me an error
 timeout.

The hanging makes me suspect that the aforementioned deadlock is occurring.

Cheers,
Chris
--
http://chrisrebert.com
-- 
http://mail.python.org/mailman/listinfo/python-list

python cgi webpage won't redirect before background children processes finish

[Yingjie Lin]

Hi all,

I have a python cgi script which looks like this:

[CODE STARTING HERE]
open('x')
print 'Content-Type:nbsp;text/html\n\n'
..
print 'meta http-equiv=refresh content=15;url=%s' % myURL
..
### after printing the webpage
os.system('python myfile.py')
logfile.write('END OF SCRIPT')
logfile.close()
[CODE ENDING]

Question: I want this cgi webpage to automatically redirect to myURL after 15 
seconds. 
As soon as the execution of this script finishes, the corresponding job 
disappears from 
ps command output, the webpage is displayed and the log file is written. 
However, the 
webpage doesn't redirect after 15 seconds unless the background child process 
'python myfile.py' finishes by then.

Is this problem caused by initialing the children job through os.system() ? 
Does any one 
know what I need to change to make the redirection work before background 
children processes finish?

Thank you very much!

Yingjie
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Python CGI windows

[Srikanth N]

Dear All,

I Have certain clarification in python CGI.

I use Python IDLE

*1. How do we execute CGI Scripts in Windows?
2. How do i configure the Server?(If i use WAMP,XAMPP)
3. Is mod_python required for python cgi?
*
Someone Please revert back to me with the solution for the same.I would be
at-most thankful


-- 
Thanks  Regards,
Srikanth.N
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Re: Python CGI windows

[Thomas Jollans]

On 2010-08-13 12:40, Srikanth N wrote:
 *1. How do we execute CGI Scripts in Windows?
 *
You'll need a web server.

 *2. How do i configure the Server?(If i use WAMP,XAMPP)
 *
For CGI, you just need your server configured for CGI, nothing
Python-specific. It would surprise me if XAMPP didn't set up a working
cgi-bin for your programming pleasure anyway.

 *3. Is mod_python required for python cgi?
 *
No. mod_python is a completely different approach to running Python from
the web. Don't use it, it's dead. If you want something similar, use
mod_wsgi.
**
Come to think of it, you should probably look into WSGI anyway -- you
can run WSGI scripts via CGI for the time being, that's simple enough,
and switch to something else for production, or for serious development,
later on.

 Someone Please revert back to me with the solution for the same.I
 would be at-most thankful
 
This line is fascinating,
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Re: Python CGI windows

[Thomas Jollans]

On 2010-08-13 12:40, Srikanth N wrote:
 *2. How do i configure the Server?(If i use WAMP,XAMPP)
 *
Sorry, I forgot to link you to

http://www.editrocket.com/articles/python_apache_windows.html

Hope this helps.

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[issue9007] CGIHTTPServer supports only Python CGI scripts

[anatoly techtonik]

anatoly techtonik techto...@gmail.com added the comment:

It was actual only for old Mac versions without popen2/popen3 calls. popenX 
calls were replaced with subprocess which should be available on MacOS.

--
status: open - closed

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[issue9007] CGIHTTPServer supports only Python CGI scripts

[anatoly techtonik]

Changes by anatoly techtonik techto...@gmail.com:


--
title: CGIHTTPServer - CGIHTTPServer supports only Python CGI scripts

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[issue9007] CGIHTTPServer supports only Python CGI scripts

[Brian Curtin]

Changes by Brian Curtin cur...@acm.org:


--
priority: normal - low
stage:  - needs patch
type:  - behavior
versions:  -Python 3.3

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Python, CGI and Sqlite3

[Majdi Sawalha]

Dear list members,

I am writing CGI program that reads a text feild and uses with select statement 
to retrieve data from a database file using sqlite3. the program behaived very 
strange as it does not recognizes the 

import sqlite3

statement? and it gives the following error
ImportError: No module named sqlite3,

i tried it on python shell and all statements are work well.
i tried it also by prining the output to a text file instead using cgi web 
folder, and it worked.

Looking forward to hearing from you.

best regards,

Majdi Sawalha

Faculty of Engineering
School of Computing
University of Leeds
Leeds, LS2 9JT
UK
http://www.comp.leeds.ac.uk/sawalha 


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Re: Python, CGI and Sqlite3

[Tim Chase]

On 04/13/2010 12:41 PM, Majdi Sawalha wrote:

import sqlite3

statement? and it gives the following error
ImportError: No module named sqlite3,

i tried it on python shell and all statements are work well.


A couple possible things are happening but here are a few that 
pop to mind:


1) you're running different versions of python (sqlite was 
bundled beginning in 2.5, IIRC) so when you run from a shell, you 
get python2.5+ but your CGI finds an older version.  Your CGI can 
dump the value of sys.version which you can compare with your 
shell's version


2) the $PYTHONPATH is different between the two.  Check the 
contents of sys.path in both the shell and the CGI program to see 
if they're the same.  You might also dump the results of 
os.environ.get('PYTHONPATH', None)  to see if an environment 
variable specifies the $PYTHONPATH differently


3) while it reads correctly above, it's theoretically possible 
that you have a spelling error like import sqllite3?  I've been 
stung once or twice by this sort of problem so it's not entirely 
impossible :)


-tkc







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RE: Python, CGI and Sqlite3

[Ahmed, Shakir]

-Original Message-
From: python-list-bounces+shahmed=sfwmd@python.org
[mailto:python-list-bounces+shahmed=sfwmd@python.org] On Behalf Of
Tim Chase
Sent: Tuesday, April 13, 2010 2:36 PM
To: Majdi Sawalha
Cc: python-list@python.org
Subject: Re: Python, CGI and Sqlite3

On 04/13/2010 12:41 PM, Majdi Sawalha wrote:
 import sqlite3

 statement? and it gives the following error
 ImportError: No module named sqlite3,

 i tried it on python shell and all statements are work well.

A couple possible things are happening but here are a few that 
pop to mind:

1) you're running different versions of python (sqlite was 
bundled beginning in 2.5, IIRC) so when you run from a shell, you 
get python2.5+ but your CGI finds an older version.  Your CGI can 
dump the value of sys.version which you can compare with your 
shell's version

2) the $PYTHONPATH is different between the two.  Check the 
contents of sys.path in both the shell and the CGI program to see 
if they're the same.  You might also dump the results of 
os.environ.get('PYTHONPATH', None)  to see if an environment 
variable specifies the $PYTHONPATH differently

3) while it reads correctly above, it's theoretically possible 
that you have a spelling error like import sqllite3?  I've been 
stung once or twice by this sort of problem so it's not entirely 
impossible :)

-tkc

Tim is right, following import works fine with me.

import sqlite3 






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Re: Converting Python CGI to WSGI scripts

[John Nagle]

Sebastian Bassi wrote:

On Tue, Mar 16, 2010 at 2:18 PM,  pyt...@bdurham.com wrote:

I have a few dozen simple Python CGI scripts.
Are there any advantages or disadvantages to rewriting these CGI scripts as
WSGI scripts?


It depends of the script. WSGI should be faster since you don't start
a Python instance for each call (as in CGI).


   It's almost always faster.  But be careful about global state.
Remember that WSGI/FCGI programs are really functions, called
over and over with a new transaction on each call.  So your
function has to be reusable.

   Things like initializing global variables at program load time,
rather than when the main function is called, may give trouble.
Also, be careful about leaving files, database connections, and
sockets open after the main function returns.

John Nagle
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Re: Converting Python CGI to WSGI scripts

[python]

Sebastian/John,

Thank you very much for your feedback. 

John: I initially missed the nuance of WSGI scripts being function
calls. I suspect your tip has saved me a lot of pain :)

Regards,

Malcolm
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Converting Python CGI to WSGI scripts

[python]

I have a few dozen simple Python CGI scripts.

Are there any advantages or disadvantages to rewriting these CGI
scripts as WSGI scripts?

Apologies if my terminology is not correct ... when I say WSGI
scripts I mean standalone scripts like the following simplified
(as an example) template:

import sys
def application(environ, start_response):
output = 'Welcome to your mod_wsgi website! It
uses:\n\nPython %s' % sys.version
response_headers = [
('Content-Length', str(len(output))),
('Content-Type', 'text/plain'),
]
start_response('200 OK', response_headers)
return [output]

When I say script I don't mean classic WSGI application in the
sense of a .serve_forever() loop coordinating a bunch of related
scripts - I mean individual, standalone scripts.

Hope this makes sense :)

Thank you,
Malcolm
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Re: Converting Python CGI to WSGI scripts

[Sebastian Bassi]

On Tue, Mar 16, 2010 at 2:18 PM,  pyt...@bdurham.com wrote:
 I have a few dozen simple Python CGI scripts.
 Are there any advantages or disadvantages to rewriting these CGI scripts as
 WSGI scripts?

It depends of the script. WSGI should be faster since you don't start
a Python instance for each call (as in CGI).

-- 
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Curso de Python en un día: http://bit.ly/cursopython
Python for Bioinformatics: http://tinyurl.com/biopython

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Re: best performance for storage of server information for python CGI web app?

[Aahz]

In article 58e5cd75-75be-4785-8e79-490364396...@e31g2000vbm.googlegroups.com,
davidj411  davidj...@gmail.com wrote:

i was also thinking about using SQL Lite with one DB to store all the
info. with this option, i would not have to worry about concurrent
updates, but as the file size increases, i could expect performance to
suffer again?

Depends what you mean by suffer.  Performance always decreases as size
gets larger unless you take specific steps (such as better algorithms or
bigger hardware).  Using indexes should give SQLite reasonable
performance; you can always upgrade to a faster SQL implementation or
switch to another kind of storage.  But honestly, until you get to
millions of records, you should be fine with SQLite.
-- 
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The best way to get information on Usenet is not to ask a question, but
to post the wrong information.  
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best performance for storage of server information for python CGI web app?

[davidj411]

I am wondering what will give me the best performance for storing
information about the servers in our environment.
currently i store all info about all servers in a single shelve file,
but i have concerns.
1) as the size of the shelve file increases, will performance suffer ?
2) what about if 2 updates occur at the same time to the shelve file?
when a shelve file is opened, is the whole file read into memory?

if either scenario (1 or 2) is true, then should i think about
creating a shelve file per server?
i was also thinking about using SQL Lite with one DB to store all the
info.
with this option, i would not have to worry about concurrent updates,
but as the file size increases, i could expect performance to suffer
again?

I am running Python 2.6 CGI scripts on Apache web server on windows
platform. they interact with the current shelve file to pull info or
request info from a python service which will go collect the info and
put it into the shelve file.
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Re: In python CGI, how to pass hello back to a javascript function as an argument at client side?

[Bruno Desthuilliers]

zxo102 a écrit :

Hi everyone,
How can I pass a string generated from python cgi at server side
to a
javascript function as an argument at client side?



This is common HTTP / javascriot stuff - nothing related to Python. 
First learn about the HTTP protocol - something you obviously need if 
doing web development -, then eventually google for XMLHttpRequest (or 
'ajax').


To make a long story short: the client side doesn't give a damn about 
how the server-side works - it requests an url (- read the part about 
HTTP Request in the rfc), waits for the response (- read the part 
about HTTP Response in the rfc), and whatever it wants with the 
response. FWIW, HTTP requests can have a query string containing 
arguments.


From the server-side POV, your CGI script doesn't return anything - 
it generates a HTTP response, which will be sent back to the client by 
Apache.

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Re: In python CGI, how to pass hello back to a javascript function as an argument at client side?

[Piet van Oostrum]

 zxo102 zxo...@gmail.com (z) wrote:

z Hi everyone,
z How can I pass a string generated from python cgi at server side
z to a
z javascript function as an argument at client side?

z  I want test.py to return  a hello back so the javascript function
z load takes hello as argument like  load(hello).

z 2. server side: test.py
z ...
z #!c:\python24\python.exe

z def main():
zmessage = 'hello'
z#return message

z main()
z ...

z Any ideas?

CGI scripts return stuff by printing it, or more generally writing to
stdout.

So print message should do. The rest is not a Python question but a
Javascript question.
-- 
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WWW: http://pietvanoostrum.com/
PGP key: [8DAE142BE17999C4]
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In python CGI, how to pass hello back to a javascript function as an argument at client side?

[zxo102]

Hi everyone,
How can I pass a string generated from python cgi at server side
to a
javascript function as an argument at client side?

Here is my case:

1. client side:
 load is a javascript function in a html page. It starts the
python CGI test.py via Apache:
html
script language=javascript
...
load(test.py );
...
/script
...
/html

 I want test.py to return  a hello back so the javascript function
load takes hello as argument like  load(hello).

2. server side: test.py
...
#!c:\python24\python.exe

def main():
   message = 'hello'
   #return message

main()
...

Any ideas?


Thanks in advance for your help.


ouyang

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Serving html and python cgi through BaseHTTPServer.py

[Mads Nielsen]

Hello all.

im tinkering with some beginner cgi stuff in python. (form processing)
i have a basic html document with a form and some inputs and i have a cgi.py
file to process the form.

how does one serve html and python cgi through the BaseHTTPServer included
with python 2.6 ?

i have tried to go to http://localhost:8000/index.html but no go. i get a
Error response 501 Unsupported method ('GET').

/mads
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Re: Unix Change Passwd Python CGI

[Roger Binns]

-BEGIN PGP SIGNED MESSAGE-
Hash: SHA1

Derek Tracy wrote:
 Apache is running on the same system that needs the password changed.  I
 need to keep security high and can not install additional modules at
 this time.
 
 I just need a general direction to start looking, and I do not have
 expect installed on the system.

I recommend looking in the Samba source code where they have a program
that does just that.

Roger
-BEGIN PGP SIGNATURE-
Version: GnuPG v1.4.9 (GNU/Linux)

iEYEARECAAYFAkmlGVcACgkQmOOfHg372QTZHACdFG0+Ls2Su/jRqkc4YZyxXK35
N7AAoNKfd7bMypR7b6Ex6auaU/9D4rKa
=POal
-END PGP SIGNATURE-

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Unix Change Passwd Python CGI

[Derek Tracy]

I am using python version 2.5.1 and need to create a python cgi application
to allow a user to change their unix password.

Apache is running on the same system that needs the password changed.  I
need to keep security high and can not install additional modules at this
time.

I just need a general direction to start looking, and I do not have expect
installed on the system.

Any ideas would be wonderful!

R/S --
-
Derek Tracy
trac...@gmail.com
-
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Re: Unix Change Passwd Python CGI

[James Matthews]

IMHO That sounds like the biggest security hole I can think of. Anyways you
can open a pipe to passwd. to have the change there password.

James

On Tue, Feb 24, 2009 at 5:19 PM, Derek Tracy trac...@gmail.com wrote:

 I am using python version 2.5.1 and need to create a python cgi application
 to allow a user to change their unix password.

 Apache is running on the same system that needs the password changed.  I
 need to keep security high and can not install additional modules at this
 time.

 I just need a general direction to start looking, and I do not have expect
 installed on the system.

 Any ideas would be wonderful!

 R/S --
 -
 Derek Tracy
 trac...@gmail.com
 -


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small python-cgi wiki?

[Bernard Rankin]

Hello,

I'm looking to set up a small private wiki, and am looking for recommendations.

Some sort of CGI based package that I could just untar somewhere web accessable 
via Apache would be great.

Any ideas?

Thanks,
:)


  

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Re: small python-cgi wiki?

[excord80]

On Jan 28, 12:02 pm, Bernard Rankin beranki...@yahoo.com wrote:

 I'm looking to set up a small private wiki, and am looking for 
 recommendations.

 Some sort of CGI based package that I could just untar somewhere web 
 accessable via Apache would be great.

There are a number of them listed at 
http://wiki.python.org/moin/PythonWikiEngines
. You might have a look at PikiPiki.
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Re: small python-cgi wiki?

[Petite Abeille]

On Jan 28, 2009, at 6:02 PM, Bernard Rankin wrote:

I'm looking to set up a small private wiki, and am looking for  
recommendations.


Some sort of CGI based package that I could just untar somewhere web  
accessable via Apache would be great.


You might be interested by Nanoki, a small, simple wiki engine.

Online demo:

http://svr225.stepx.com:3388/search?q=python

http://svr225.stepx.com:3388/nanoki

One thing though... it's not Python :)

Cheers,

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Re: small python-cgi wiki?

[Дамјан Георгиевски]

 I'm looking to set up a small private wiki, and am looking for
 recommendations.
 
 Some sort of CGI based package that I could just untar somewhere web
 accessable via Apache would be great.

http://hatta.sheep.art.pl/About
· single file
· stores stuff in mercurial.
· it's WSGI, so yes you can run it as CGI too 
(wsgiref.handlers.CGIHandler)
http://hatta.sheep.art.pl/Features

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A: Because it reverses the logical flow of converstion.
Q: Why is top posting frowned upon?

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Re: using subprocess module in Python CGI

[ANURAG BAGARIA]

Dear Matt,

Thank you for your answer.
This script is just a kind of test script so as to actually get it started
on doing any simple job. The actual process would be much more complicated
where in I would like to extract the tar file and search for a file with
certain extension and this file would be given as input to another program
installed on the server. Later on I would also like to use process.wait() so
that I can get a status of the job execution and completion from the server
and this information can be displayed to the users on the web-page where
they submit their jobs. As to what I understand subprocess.call() would be
the best in that case. Please correct, if I am wrong.

The whole process is like a user submitting a tar file via the web-browser
with some data and getting back the processed results in the form of a new
tar file after performing a few operations on the files submitted as input
tar file.

Thanking you once again for your valuable time.
Regards.

On Wed, Dec 24, 2008 at 1:54 AM, Matt Nordhoff
mnordh...@mattnordhoff.comwrote:

 ANURAG BAGARIA wrote:
  Hello,
 
  I am a Python Newbie and would like to call a short python script via
  browser using a CGI script, but initially I am trying to call the same
  python script directly through python command line. The script intends
  to perform a few command line in a pipe and I have written the script (a
  short one) as follows.
 
  #!/usr/bin/python
 
  import cgi, string, os, sys, cgitb, commands, subprocess
  import posixpath, macpath
  #file = x.tar.gz
  #comd = tar -xf %s % (file)
  #os.system(comd)
  #commands.getoutput('tar -xf x.tar.gz | cd demo; cp README ../')
  comd = [\
  tar -xf x.tar.gz, \
  cd demo, \
  cp README ../, \
]

 That's not how subprocess.call() works. You're trying to run an
 executable called tar -xf x.tar.gz, passing it the arguments cd demo
 and cp README ../.

  outFile = os.path.join(os.curdir, output.log)
  outptr = file(outFile, w)
  errFile = os.path.join(os.curdir, error.log)
  errptr = file(errFile, w)
  retval = subprocess.call(comd, 0, None, None, outptr, errptr)
  errptr.close()
  outptr.close()
  if not retval == 0:
  errptr = file(errFile, r)
  errData = errptr.read()
  errptr.close()
  raise Exception(Error executing command:  + repr(errData))
 
 
  but after trying to execute this independently, I get the following
  error which I am unable to interpret :
 
  Traceback (most recent call last):
File process.py, line 18, in module
  retval = subprocess.call(comd, 0, None, None, outptr, errptr)
File /usr/lib/python2.5/subprocess.py, line 443, in call
  return Popen(*popenargs, **kwargs).wait()
File /usr/lib/python2.5/subprocess.py, line 593, in __init__
  errread, errwrite)
File /usr/lib/python2.5/subprocess.py, line 1135, in _execute_child
  raise child_exception
 
 
  Could someone suggest where am I going wrong and if corrected, what is
  the probability of this script being compatible with being called
  through the browser. Thanking you people in advance.

 Well, you'd need to output something, but otherwise, sure, why not?

 print Content-Type: text/html
 print
 print html.../html

  Regards.

 Why do you even need to use subprocess to do this? All it's doing is
 extracting the README file from a tarball, right? You can use the
 tarfile module for that.

 http://docs.python.org/library/tarfile.html
 --




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Re: using subprocess module in Python CGI

[ANURAG BAGARIA]

Thank you for the prompt response.

Yeah, I missed out one line at the end of the error, the whole of which is:

Traceback (most recent call last):
  File process.py, line 18, in module
retval = subprocess.call(comd, 0, None, None, outptr, errptr)
  File /usr/lib/python2.5/subprocess.py, line 443, in call
return Popen(*popenargs, **kwargs).wait()
  File /usr/lib/python2.5/subprocess.py, line 593, in __init__
errread, errwrite)
  File /usr/lib/python2.5/subprocess.py, line 1135, in _execute_child
raise child_exception
OSError: [Errno 2] No such file or directory

Looking forward to any kind of help or suggestion in this regard.
Thanks.

On Tue, Dec 23, 2008 at 7:00 AM, Chris Rebert c...@rebertia.com wrote:

 On Mon, Dec 22, 2008 at 2:02 AM, ANURAG BAGARIA
 anurag.baga...@gmail.com wrote:
  Hello,
 
  I am a Python Newbie and would like to call a short python script via
  browser using a CGI script, but initially I am trying to call the same
  python script directly through python command line. The script intends to
  perform a few command line in a pipe and I have written the script (a
 short
  one) as follows.
 
  #!/usr/bin/python
 
  import cgi, string, os, sys, cgitb, commands, subprocess
  import posixpath, macpath
  #file = x.tar.gz
  #comd = tar -xf %s % (file)
  #os.system(comd)
  #commands.getoutput('tar -xf x.tar.gz | cd demo; cp README ../')
  comd = [\
  tar -xf x.tar.gz, \
  cd demo, \
  cp README ../, \
]
  outFile = os.path.join(os.curdir, output.log)
  outptr = file(outFile, w)
  errFile = os.path.join(os.curdir, error.log)
  errptr = file(errFile, w)
  retval = subprocess.call(comd, 0, None, None, outptr, errptr)
  errptr.close()
  outptr.close()
  if not retval == 0:
  errptr = file(errFile, r)
  errData = errptr.read()
  errptr.close()
  raise Exception(Error executing command:  + repr(errData))
 
 
  but after trying to execute this independently, I get the following error
  which I am unable to interpret :
 
  Traceback (most recent call last):
File process.py, line 18, in module
  retval = subprocess.call(comd, 0, None, None, outptr, errptr)
File /usr/lib/python2.5/subprocess.py, line 443, in call
  return Popen(*popenargs, **kwargs).wait()
File /usr/lib/python2.5/subprocess.py, line 593, in __init__
  errread, errwrite)
File /usr/lib/python2.5/subprocess.py, line 1135, in _execute_child
  raise child_exception

 There should be at least one more line in this traceback, and that
 line is the most important one.
 People will need that line to help you with your problem.

 Cheers,
 Chris

 --
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Re: using subprocess module in Python CGI

[Matt Nordhoff]

ANURAG BAGARIA wrote:
 Hello,
 
 I am a Python Newbie and would like to call a short python script via
 browser using a CGI script, but initially I am trying to call the same
 python script directly through python command line. The script intends
 to perform a few command line in a pipe and I have written the script (a
 short one) as follows.
 
 #!/usr/bin/python
 
 import cgi, string, os, sys, cgitb, commands, subprocess
 import posixpath, macpath
 #file = x.tar.gz
 #comd = tar -xf %s % (file)
 #os.system(comd)
 #commands.getoutput('tar -xf x.tar.gz | cd demo; cp README ../')
 comd = [\
 tar -xf x.tar.gz, \
 cd demo, \
 cp README ../, \
   ]

That's not how subprocess.call() works. You're trying to run an
executable called tar -xf x.tar.gz, passing it the arguments cd demo
and cp README ../.

 outFile = os.path.join(os.curdir, output.log)
 outptr = file(outFile, w)
 errFile = os.path.join(os.curdir, error.log)
 errptr = file(errFile, w)
 retval = subprocess.call(comd, 0, None, None, outptr, errptr)
 errptr.close()
 outptr.close()
 if not retval == 0:
 errptr = file(errFile, r)
 errData = errptr.read()
 errptr.close()
 raise Exception(Error executing command:  + repr(errData))
 
 
 but after trying to execute this independently, I get the following
 error which I am unable to interpret :
 
 Traceback (most recent call last):
   File process.py, line 18, in module
 retval = subprocess.call(comd, 0, None, None, outptr, errptr)
   File /usr/lib/python2.5/subprocess.py, line 443, in call
 return Popen(*popenargs, **kwargs).wait()
   File /usr/lib/python2.5/subprocess.py, line 593, in __init__
 errread, errwrite)
   File /usr/lib/python2.5/subprocess.py, line 1135, in _execute_child
 raise child_exception
 
 
 Could someone suggest where am I going wrong and if corrected, what is
 the probability of this script being compatible with being called
 through the browser. Thanking you people in advance.

Well, you'd need to output something, but otherwise, sure, why not?

print Content-Type: text/html
print
print html.../html

 Regards.

Why do you even need to use subprocess to do this? All it's doing is
extracting the README file from a tarball, right? You can use the
tarfile module for that.

http://docs.python.org/library/tarfile.html
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using subprocess module in Python CGI

[ANURAG BAGARIA]

Hello,

I am a Python Newbie and would like to call a short python script via
browser using a CGI script, but initially I am trying to call the same
python script directly through python command line. The script intends to
perform a few command line in a pipe and I have written the script (a short
one) as follows.

#!/usr/bin/python

import cgi, string, os, sys, cgitb, commands, subprocess
import posixpath, macpath
#file = x.tar.gz
#comd = tar -xf %s % (file)
#os.system(comd)
#commands.getoutput('tar -xf x.tar.gz | cd demo; cp README ../')
comd = [\
tar -xf x.tar.gz, \
cd demo, \
cp README ../, \
  ]
outFile = os.path.join(os.curdir, output.log)
outptr = file(outFile, w)
errFile = os.path.join(os.curdir, error.log)
errptr = file(errFile, w)
retval = subprocess.call(comd, 0, None, None, outptr, errptr)
errptr.close()
outptr.close()
if not retval == 0:
errptr = file(errFile, r)
errData = errptr.read()
errptr.close()
raise Exception(Error executing command:  + repr(errData))


but after trying to execute this independently, I get the following error
which I am unable to interpret :

Traceback (most recent call last):
  File process.py, line 18, in module
retval = subprocess.call(comd, 0, None, None, outptr, errptr)
  File /usr/lib/python2.5/subprocess.py, line 443, in call
return Popen(*popenargs, **kwargs).wait()
  File /usr/lib/python2.5/subprocess.py, line 593, in __init__
errread, errwrite)
  File /usr/lib/python2.5/subprocess.py, line 1135, in _execute_child
raise child_exception


Could someone suggest where am I going wrong and if corrected, what is the
probability of this script being compatible with being called through the
browser. Thanking you people in advance.

Regards.

-- 
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AB
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Re: using subprocess module in Python CGI

[Chris Rebert]

On Mon, Dec 22, 2008 at 2:02 AM, ANURAG BAGARIA
anurag.baga...@gmail.com wrote:
 Hello,

 I am a Python Newbie and would like to call a short python script via
 browser using a CGI script, but initially I am trying to call the same
 python script directly through python command line. The script intends to
 perform a few command line in a pipe and I have written the script (a short
 one) as follows.

 #!/usr/bin/python

 import cgi, string, os, sys, cgitb, commands, subprocess
 import posixpath, macpath
 #file = x.tar.gz
 #comd = tar -xf %s % (file)
 #os.system(comd)
 #commands.getoutput('tar -xf x.tar.gz | cd demo; cp README ../')
 comd = [\
 tar -xf x.tar.gz, \
 cd demo, \
 cp README ../, \
   ]
 outFile = os.path.join(os.curdir, output.log)
 outptr = file(outFile, w)
 errFile = os.path.join(os.curdir, error.log)
 errptr = file(errFile, w)
 retval = subprocess.call(comd, 0, None, None, outptr, errptr)
 errptr.close()
 outptr.close()
 if not retval == 0:
 errptr = file(errFile, r)
 errData = errptr.read()
 errptr.close()
 raise Exception(Error executing command:  + repr(errData))


 but after trying to execute this independently, I get the following error
 which I am unable to interpret :

 Traceback (most recent call last):
   File process.py, line 18, in module
 retval = subprocess.call(comd, 0, None, None, outptr, errptr)
   File /usr/lib/python2.5/subprocess.py, line 443, in call
 return Popen(*popenargs, **kwargs).wait()
   File /usr/lib/python2.5/subprocess.py, line 593, in __init__
 errread, errwrite)
   File /usr/lib/python2.5/subprocess.py, line 1135, in _execute_child
 raise child_exception

There should be at least one more line in this traceback, and that
line is the most important one.
People will need that line to help you with your problem.

Cheers,
Chris

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Permission Issues in python cgi scripts on Apache 2.2 on OSX Leopard

[Dan Yamins]

Using Apache 2.2 on my local OSX machine, I;ve set up a virtual host to
serve a directory that a project of mine is in.  In this directory, I have
some python .cgi scripts that I use to dynamically generated locally-used
html code.   In several places,scripts that work fine when not run as .cgi
scripts via the webserver (but just as regular .py scripts in the Python
interpreter) break when run by Apache because of what look like permissions
related issues. Specifically:

1) When a script attempts to make a directory, it fails to do so unless
writing is enabled on the superdirectory for all users, not just owner or
group.   I see a permission denied error via the cgitb output.

and,

2) Some operating system stat modification functions, like os.utim, fail --
with the error message being that Operation is Not Permitted.I've put
permissions to 777 for all the involved files but to no avail.   (Am I right
in thinking that this problem is also a permissions issue?  I know the first
one is, because the error message says so explicitly.)

My computer is running off-line and this only ever going to be a local
development task.   So, my basic question is:  is there some way, for the
directories that I'm serving, to turn of all the permissions protections
whatsoever?  E.g. to run my cgi scripts as if the process running the
scripts had all root privileges?  And so that I can run scripts via cgi
without having to worry about problems like the Operation Not Permitted
Errror?  (I want to be able to take advantage of using pythong for dynamic
web-page generation without worrying about permission and security issues,
since these files will never be near anything online.)

I've tried to do things like put the proper things in my Apache
configuration files (e.g the virtual host conf fil, the httpd.conf file,
etc...), but this failed to achieve my goal.

I apologize if I'm sending this mail to the wrong list,

Thanks,
Dan
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Problems with running Python CGI Scripts

[Edward FISHER]

Hey guys.
Im having problems running a python cgi. Im using the example code from:
http://www.python.org/doc/essays/pp...east/sld041.htm as writen by Van Rossum 
himself

I can get the script to run the python script but all that happens is that the 
black python box appears then disapears, the html that the python scripts 
should generate is never output.

My html is:

htmlhead
meta http-equiv=Content-Type content=text/html; charset=windows-1252
titleA Typical HTML form/title/head
body
p align=centerubfont size=5A Typical HTML form/font/b/u/p
p align=centerfont size=1 color=#FF*Test CGI script and HTML to
test server for correct running of python cgi scripting/font/p
form method='GET' action='http://www.fisherphotographics.co.uk/testcgia.pyc'
p align=centerYour First Name:
input type='text' name='firstname' size=20
p align=centerYour Last Name: input type='text' name='lastname' size=20
p align=centerClick here to submit form: input type='submit' value='Yeah!'
input type='hidden' name='session' value='1f9a2'
/form/body/html

This is calling the pyc file of the python script. I dont understand why if i 
call the py file itself all i get returned is the plain text of the python file.

The python script is:

#!/usr/local/bin/python
import cgi

def main():
print Content-type: text/html\n
form = cgi.FieldStorage()
if form.has_key(firstname) and form[firstname].value != :
#if form has an object called firstname and the value is not an empty string
print h1Hello, form[firstname].value, /h1
else:
print h1Error! Please enter first name./h1

main()

If you need to see what happens then follow this link:
http://www.fisherphotographics.co.uk/testhtml1.htm

The python file has come directly from the example so i must me doing something 
wrong. I have all the correct permissions etc
Thanks very much
Ed Fisher 
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Re: Problems with running Python CGI Scripts

[Gabriel Genellina]

En Wed, 03 Sep 2008 05:29:39 -0300, Edward FISHER [EMAIL PROTECTED]  
escribi�:


I can get the script to run the python script but all that happens is  
that the black python box appears then disapears, the html that the  
python scripts should generate is never output.

[...]
This is calling the pyc file of the python script. I dont understand why  
if i call the py file itself all i get returned is the plain text of the  
python file.


That's a server setting (Apache or whatever) - make sure it is configured  
to *execute* the script.



The python script is:

#!/usr/local/bin/python
import cgi

def main():
print Content-type: text/html\n


I hope this is just the way you posted your message, but remember that in  
Python indentation is important. The above code isn't valid. Once you are  
sure that your script doesn't have syntax errors, add this lines on the  
top to help debugging:


import cgitb; cgitb.enable()

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Please recommend a blog program written using python-cgi

[Royt]

Hi, I'm a newbie to Python, but I think it won't be too hard to learn.
A few days ago I registered Google App Engine, it only support Python
2.5. I want to set my blog on it soon. But it's not easy for me to
finish it in a short time since I'm not very familiar with Python, so
I want find some codes available, throught reading the code, I can
learn something from it. I know there are many frameworks for web
development, but I just want the code using traditional CGI method,
it's easy to use and it doesn't require any additional knowledge about
framework. I need a simple example (support basic function of a
weblog, easy to revise) but not a complicated huge monster (I don't
think such a thing now exists).

I find some online course, i.e. 
http://www.upriss.org.uk/python/PythonCourse.html
 http://www.python.org/doc/essays/ppt/sd99east/index.htm  but I
didn't find the code needed, could anyone recommend it to me? thanks.
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Re: Please recommend a blog program written using python-cgi

[Diez B. Roggisch]

Royt wrote:

 Hi, I'm a newbie to Python, but I think it won't be too hard to learn.
 A few days ago I registered Google App Engine, it only support Python
 2.5. I want to set my blog on it soon. But it's not easy for me to
 finish it in a short time since I'm not very familiar with Python, so
 I want find some codes available, throught reading the code, I can
 learn something from it. I know there are many frameworks for web
 development, but I just want the code using traditional CGI method,
 it's easy to use and it doesn't require any additional knowledge about
 framework. I need a simple example (support basic function of a
 weblog, easy to revise) but not a complicated huge monster (I don't
 think such a thing now exists).

I guess you are out of luck. Usually people use frameworks because it *does*
make work easier. AFAIK google engine supports Django. So try  aquaint you
with that - and I bet there are Django-based blogs out there.

Diez
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Re: Please recommend a blog program written using python-cgi

[Royt]

On Jun 12, 4:58 pm, Diez B. Roggisch [EMAIL PROTECTED] wrote:
 Royt wrote:
  Hi, I'm a newbie to Python, but I think it won't be too hard to learn.
  A few days ago I registered Google App Engine, it only support Python
  2.5. I want to set my blog on it soon. But it's not easy for me to
  finish it in a short time since I'm not very familiar with Python, so
  I want find some codes available, throught reading the code, I can
  learn something from it. I know there are many frameworks for web
  development, but I just want the code using traditional CGI method,
  it's easy to use and it doesn't require any additional knowledge about
  framework. I need a simple example (support basic function of a
  weblog, easy to revise) but not a complicated huge monster (I don't
  think such a thing now exists).

 I guess you are out of luck. Usually people use frameworks because it *does*
 make work easier. AFAIK google engine supports Django. So try  aquaint you
 with that - and I bet there are Django-based blogs out there.

 Diez

Oh, I'm out of luck, maybe it means few code of python-cgi blog
exists. So I'd like to find a django blog, sf.net should at least have
a piece of code, I guess. Of course, if someone could tell which
project is sipmle but pragmatic, that's better.
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Re: Python CGI Upload from Server Status

[John Dohn]

On Sat, Jun 7, 2008 at 12:50 AM, Derek Tracy [EMAIL PROTECTED] wrote:

 I am trying to create a simple python cgi app that allows the user to kick
 off an ftp from the server the cgi is on to another server; I have that
 piece working using ftplib but since the files in question are usually very
 large (500mb to 2gb) in size I want to be able to display some sort of
 status to the user, preferrably a progress bar of some sort.


You'll need some AJAX progress bar (hint: google for this term ;-) that will
be getting updates from the server or request an update every second or so.

The question is if your upload code can provide progress tracking? If it's
just a call to some xyz.upload(/here/is/my-500M-file.bin) that only
returns after several minutes of uploading without giving you any updates on
how fast things go you're probably out of luck.
OTOH if it can do e.g.callbacks for progress reporting or if it can run in a
separate thread that you could query somehow you can hook that to that AJAX
thing of your choice.

JDJ
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Re: Python CGI Upload from Server Status

[Derek Tracy]

On Fri, Jun 6, 2008 at 9:16 AM, John Dohn [EMAIL PROTECTED] wrote:

 On Sat, Jun 7, 2008 at 12:50 AM, Derek Tracy [EMAIL PROTECTED] wrote:

 I am trying to create a simple python cgi app that allows the user to kick
 off an ftp from the server the cgi is on to another server; I have that
 piece working using ftplib but since the files in question are usually very
 large (500mb to 2gb) in size I want to be able to display some sort of
 status to the user, preferrably a progress bar of some sort.


 You'll need some AJAX progress bar (hint: google for this term ;-) that
 will be getting updates from the server or request an update every second or
 so.

 The question is if your upload code can provide progress tracking? If it's
 just a call to some xyz.upload(/here/is/my-500M-file.bin) that only
 returns after several minutes of uploading without giving you any updates on
 how fast things go you're probably out of luck.
 OTOH if it can do e.g.callbacks for progress reporting or if it can run in
 a separate thread that you could query somehow you can hook that to that
 AJAX thing of your choice.

 JDJ

 --
 http://mail.python.org/mailman/listinfo/python-list


I will look for the AJAX Progress Bar, but I will admit I have never touched
AJAX and haven't written javascript in years.

I patched Pythons ftplib.py storbinary() to send callbacks to the specified
method, so I have the callbacks locked down.  The thing to note is that this
app isn't allowing the user to upload to the server the cgi is on but rather
allowing the user to kick off an ftp process on the server to another
server.

Would there be a way to do this with python cgi and automatically append or
update information on the page it is displaying?

-- 
-
Derek Tracy
[EMAIL PROTECTED]
-
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Re: argument to python cgi script

[Gabriel Genellina]

En Wed, 09 Apr 2008 11:14:33 -0300, syed mehdi [EMAIL PROTECTED]  
escribió:

 Hi Guys,
 If someone can help me in telling how can i pass arguments to python cgi
 script then that will be good.
 like if i want to pass some argument to my remote python script, by
 calling something like:
 http://localhost/cgi-bin/test.py?some\ argument.
 What is the correct way of sending arguments in this way, and how can i
 decode/receive them in test.py

Encoding:

py args = {'some': 'argument', 'x': 1, 'z': 23.4}
py import urllib
py urllib.urlencode(args)
'x=1z=23.4some=argument'

You can then use urllib.urlopen or urllib2.urlopen to send the HTTP  
request and retrieve the response.
http://docs.python.org/lib/module-urllib.html

In the server side, use cgi.FieldStorage:

form = cgi.FieldStorage()
x = form.getfirst('x', 0) # '1'
y = form.getfirst('y', 0) # '0'
z = form.getfirst('z', 0) # '23.4'

http://docs.python.org/lib/module-cgi.html

-- 
Gabriel Genellina

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argument to python cgi script

[syed mehdi]

Hi Guys,
If someone can help me in telling how can i pass arguments to python cgi
script then that will be good.
like if i want to pass some argument to my remote python script, by
calling something like:
http://localhost/cgi-bin/test.py?some\ argument.
What is the correct way of sending arguments in this way, and how can i
decode/receive them in test.py

Thanks  Regards
Syed
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Re: Python - CGI - XML - XSD

[Diez B. Roggisch]

 Sorry, it was really late when i wrote this post. The file is an XSL
 file. It defines HTML depending on what appears in the XML document.

Then the content-type might be the culprit, yes. But testing so would have
been faster than waiting for answers here... 

Diez
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Re: Python - CGI - XML - XSD

[Diez B. Roggisch]

xkenneth wrote:

 Hi All,
 
Quick question. I've got an XML schema file (XSD) that I've
 written, that works fine when my data is present as an XML file.
 (Served out by apache2.) Now when I call python as a cgi script, and
 tell it print out all of the same XML, also served up by apache2, the
 XSD is not applied. Does this have to do with which content type i
 defined when printing the xml to stdout?

Who's applying the stylesheet? The browser, some application like XmlSpy or
what?

Diez
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Re: Python - CGI - XML - XSD

[xkenneth]

On Mar 12, 6:32 am, Diez B. Roggisch [EMAIL PROTECTED] wrote:
 xkenneth wrote:
  Hi All,

     Quick question. I've got an XML schema file (XSD) that I've
  written, that works fine when my data is present as an XML file.
  (Served out by apache2.) Now when I call python as a cgi script, and
  tell it print out all of the same XML, also served up by apache2, the
  XSD is not applied. Does this have to do with which content type i
  defined when printing the xml to stdout?

 Who's applying the stylesheet? The browser, some application like XmlSpy or
 what?

 Diez

The browser.

Regards,
Kenneth Miller
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Re: Python - CGI - XML - XSD

[Stefan Behnel]

xkenneth wrote:
 On Mar 12, 6:32 am, Diez B. Roggisch [EMAIL PROTECTED] wrote:
 xkenneth wrote:
 Hi All,
Quick question. I've got an XML schema file (XSD) that I've
 written, that works fine when my data is present as an XML file.
 (Served out by apache2.) Now when I call python as a cgi script, and
 tell it print out all of the same XML, also served up by apache2, the
 XSD is not applied. Does this have to do with which content type i
 defined when printing the xml to stdout?
 Who's applying the stylesheet? The browser, some application like XmlSpy or
 what?
 
 The browser.

Well, why should it validate your file? Browsers don't do that just for fun.

Stefan
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Re: Python - CGI - XML - XSD

[xkenneth]

On Mar 12, 11:58 am, Stefan Behnel [EMAIL PROTECTED] wrote:
 xkenneth wrote:
  On Mar 12, 6:32 am, Diez B. Roggisch [EMAIL PROTECTED] wrote:
  xkenneth wrote:
  Hi All,
     Quick question. I've got an XML schema file (XSD) that I've
  written, that works fine when my data is present as an XML file.
  (Served out by apache2.) Now when I callpythonas a cgi script, and
  tell it print out all of the same XML, also served up by apache2, the
 XSDis not applied. Does this have to do with which content type i
  defined when printing the xml to stdout?
  Who's applying the stylesheet? The browser, some application like XmlSpy or
  what?

  The browser.

 Well, why should it validate your file? Browsers don't do that just for fun.

 Stefan

Sorry, it was really late when i wrote this post. The file is an XSL
file. It defines HTML depending on what appears in the XML document.

Regards,
Kenneth Miller
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Python - CGI - XML - XSD

[xkenneth]

Hi All,

   Quick question. I've got an XML schema file (XSD) that I've
written, that works fine when my data is present as an XML file.
(Served out by apache2.) Now when I call python as a cgi script, and
tell it print out all of the same XML, also served up by apache2, the
XSD is not applied. Does this have to do with which content type i
defined when printing the xml to stdout?

Regards,
Kenneth Miller
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Re: Python CGI Webpage with an Image

[rodmc]

 Is the cgi script in the same directory? The user's browser looks
 for the jpg relative to the URL it used to get the page, which in
 the case of the CGI script is the path to the script, not the
 path to the html file.


No the CGI script is in a different folder, I could move everything to
the same folder I guess.


 If server logs are hard to get or read, try my runcgi.py script:

  http://aspn.activestate.com/ASPN/Cookbook/Python/Recipe/550822

Thanks, I will try this.

Rod
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Re: Python CGI Webpage with an Image

[Bryan Olson]

rodmc wrote:
[...]
  Python:
 
  f = open(finish.html)
  doc = f.read()
  f.close()
  print doc

You might need to start with:

 print Content-Type: text/html
 print

Is finish.html in the right place? When you browse to your
script, can you see that you're getting the html?

  HTML:
[...]
  PIMG SRC=banner.jpg NAME=graphics1 ALIGN=LEFT WIDTH=799

I suspect a server configuration and/or resource placement problem.
The image has a relative URL, and the user's browser will look for
it on the same path that it used to get the resource served by the
cgi script, up to last '/'.

Is banner.jpg in the right place, and is your web server configured
to treat everything in that directory as a cgi script, and thus
trying to execute the jpg?  If one of those is the problem, just
move banner.jpg, and/or change the relative URL. For example,
SRC=../banner.jpg will cause the browser to look for the jpg
one directory above.

Failing that, can look at the web server's log?

-- 
--Bryan
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Re: Python CGI Webpage with an Image

[rodmc]

Hi,

Thanks for your very quick response. I have played around a bit more
so that both the image and HTML file are in the public_html folder.
They are called via python using a relative URL, and have permissions
set to 755. Within the HTML file the image is accessed using just
banner.jpg. The actual page displays ok except for the image - so it
has the same problem as before. However when the same page is
displayed without running through a CGI it displays perfectly.

Kind regards,

rod

On Mar 6, 11:46 am, Bryan Olson [EMAIL PROTECTED] wrote:
 rodmc wrote:

 [...]
   Python:
  
   f = open(finish.html)
   doc = f.read()
   f.close()
   print doc

 You might need to start with:

  print Content-Type: text/html
  print

 Is finish.html in the right place? When you browse to your
 script, can you see that you're getting the html?

   HTML:
 [...]
   PIMG SRC=banner.jpg NAME=graphics1 ALIGN=LEFT WIDTH=799

 I suspect a server configuration and/or resource placement problem.
 The image has a relative URL, and the user's browser will look for
 it on the same path that it used to get the resource served by the
 cgi script, up to last '/'.

 Is banner.jpg in the right place, and is your web server configured
 to treat everything in that directory as a cgi script, and thus
 trying to execute the jpg?  If one of those is the problem, just
 move banner.jpg, and/or change the relative URL. For example,
 SRC=../banner.jpg will cause the browser to look for the jpg
 one directory above.

 Failing that, can look at the web server's log?

 --
 --Bryan



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Re: Python CGI Webpage with an Image

[rodmc]

Hi,

Good point, some code samples is probably required. Please note that
for reasons of integration with another system I am not using a
templating system.


Anyway I have copied them below:

Python:

f = open(finish.html)
doc = f.read()
f.close()
print doc


HTML:

!DOCTYPE HTML PUBLIC -//W3C//DTD HTML 4.0 Transitional//EN
HTML
HEAD
META HTTP-EQUIV=CONTENT-TYPE CONTENT=text/html;
charset=windows-1252
TITLE/TITLE
/HEAD
BODY LANG=en-GB DIR=LTR
PIMG SRC=banner.jpg NAME=graphics1 ALIGN=LEFT WIDTH=799
HEIGHT=137 BORDER=0BR CLEAR=LEFTBRBR
/P
PThank you for uploading your file/P
/BODY
/HTML
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Re: Python CGI Webpage with an Image

[Bryan Olson]

rodmc wrote:
 [...] I have played around a bit more
 so that both the image and HTML file are in the public_html folder.
 They are called via python using a relative URL, and have permissions
 set to 755. Within the HTML file the image is accessed using just
 banner.jpg. The actual page displays ok except for the image - so it
 has the same problem as before. However when the same page is
 displayed without running through a CGI it displays perfectly.

Is the cgi script in the same directory? The user's browser looks
for the jpg relative to the URL it used to get the page, which in
the case of the CGI script is the path to the script, not the
path to the html file.

If server logs are hard to get or read, try my runcgi.py script:

 http://aspn.activestate.com/ASPN/Cookbook/Python/Recipe/550822


-- 
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Python CGI Webpage with an Image

[rodmc]

Hi,

I have a set of CGI scripts set up and in one page (which is stored in
an HTML file then printed via a python CGI) there is an image. However
the image never displays, can anyone recommend a way round this
problem?

Kind regards,

rod
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Re: Python CGI Webpage with an Image

[Miki]

Hello Rod,

 I have a set of CGI scripts set up and in one page (which is stored in
 an HTML file then printed via a python CGI) there is an image. However
 the image never displays, can anyone recommend a way round this
 problem?
We need more information, can you post a code snippet? error page? ...

My *guess* is that the web server don't know how to server the image
(wrong path configuration?)

HTH,
--
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http://pythonwise.blogspot.com

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Python CGI script and CSS style sheet

[epsilon]

All:

I'm working with a Python CGI script that I am trying to use with an
external CSS (Cascading Style Sheet) and it is not reading it from the
web server.  The script runs fine minus the CSS formatting.  Does
anyone know if this will work within a Python CGI?  It seems that line
18 is not being read properly.  One more thing.  I tested this style
sheet with pure html code (no python script) and everything works
great.

Listed below is a modified example.

++

1#!/usr/bin/python
2
3import cgi
4
5print Content-type: text/html\n
6tag_form = cgi.FieldStorage()
7
8head_open_close = 
9head
10 meta http-equiv=content-type content=text/html;
charset=UTF-8
11 titleTag Sheet/title
12 link rel=stylesheet type=text/css href=central.css
13  /head
14
15  body_open = 
16  body
17  !-- tag page --
18  table class=tag-sheet
19tbody
20

Thank you,
Christopher
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Re: Python CGI script and CSS style sheet

[Tim Chase]

 I'm working with a Python CGI script that I am trying to use with an
 external CSS (Cascading Style Sheet) and it is not reading it from the
 web server.  The script runs fine minus the CSS formatting.  Does
 anyone know if this will work within a Python CGI?  It seems that line
 18 is not being read properly.  One more thing.  I tested this style
 sheet with pure html code (no python script) and everything works
 great.
 
 Listed below is a modified example.
 
 ++
 
 1#!/usr/bin/python
 2
 3import cgi
 4
 5print Content-type: text/html\n

The answer is it depends.  Mostly on the configuration of your 
web-server.  Assuming you're serving out of a cgi-bin/ directory, 
you'd be referencing

   http://example.com/cgi-bin/foo.py

If your webserver (apache, lighttpd, whatever) has been 
configured for this directory to return contents of 
non-executable items, your above code will reference

   http://example.com/cgi-bin/central.css

and so you may be able to just drop the CSS file in that directory.

However, I'm fairly certain that Apache can be (and often is) 
configured to mark folders like this as execute only, no 
file-reading.  If so, you'll likely get some sort of Denied 
message back if you fetch the CSS file via HTTP.

A better way might be to reference the CSS file as 
/media/central.css

12 link rel=stylesheet type=text/css 
href=/media/central.css /

and then put it in a media folder which doesn't have the 
execute-only/no-read permission set.

Another (less attractive) alternative is to have your CGI sniff 
the incoming request, so you can have both

  http://example.com/cgi-bin/foo.py
  http://example.com/cgi-bin/foo.py?file=css

using the 'file' GET parameter to return the CSS file instead of 
your content.  I'd consider this ugly unless deploy-anywhere is 
needed, in which case it's not so bad because the deployment is 
just the one .py file (and optionally an external CSS file that 
it reads and dumps).

-tkc





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Re: Python CGI script and CSS style sheet

[epsilon]

Tim,

Thanks for the information and I'll work with you suggestions.  Also,
I will let you know what I find.

Thanks again,
Christopher


Tim Chase wrote:
  I'm working with a Python CGI script that I am trying to use with an
  external CSS (Cascading Style Sheet) and it is not reading it from the
  web server.  The script runs fine minus the CSS formatting.  Does
  anyone know if this will work within a Python CGI?  It seems that line
  18 is not being read properly.  One more thing.  I tested this style
  sheet with pure html code (no python script) and everything works
  great.
 
  Listed below is a modified example.
 
  ++
 
  1#!/usr/bin/python
  2
  3import cgi
  4
  5print Content-type: text/html\n

 The answer is it depends.  Mostly on the configuration of your
 web-server.  Assuming you're serving out of a cgi-bin/ directory,
 you'd be referencing

http://example.com/cgi-bin/foo.py

 If your webserver (apache, lighttpd, whatever) has been
 configured for this directory to return contents of
 non-executable items, your above code will reference

http://example.com/cgi-bin/central.css

 and so you may be able to just drop the CSS file in that directory.

 However, I'm fairly certain that Apache can be (and often is)
 configured to mark folders like this as execute only, no
 file-reading.  If so, you'll likely get some sort of Denied
 message back if you fetch the CSS file via HTTP.

 A better way might be to reference the CSS file as
 /media/central.css

 12 link rel=stylesheet type=text/css
 href=/media/central.css /

 and then put it in a media folder which doesn't have the
 execute-only/no-read permission set.

 Another (less attractive) alternative is to have your CGI sniff
 the incoming request, so you can have both

   http://example.com/cgi-bin/foo.py
   http://example.com/cgi-bin/foo.py?file=css

 using the 'file' GET parameter to return the CSS file instead of
 your content.  I'd consider this ugly unless deploy-anywhere is
 needed, in which case it's not so bad because the deployment is
 just the one .py file (and optionally an external CSS file that
 it reads and dumps).

 -tkc
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Re: pipes python cgi and gnupg

[alisonken1]

On Dec 28 2007, 7:07 pm, [EMAIL PROTECTED] wrote:
snip
 form = cgi.FieldStorage()
 if not form.has_key(pass):
print Enter password

 filename = test.gpg
 pass = form.getvalue(pass).strip()
 os.system(gpg --version  gpg.out)
 os.system(echo %s | gpg --batch --password-fd 0 --decrypt %s  d.out
 %(pass,filename))

The last time I checked, pass is a reserved word in Python.

Since you are using a reserved word as a variable, maybe that's what's
messing with your output?
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Python CGI - Presenting a zip file to user

[jwwest]

Hi all,

I'm working on a cgi script that zips up files and presents the zip
file to the user for download. It works fine except for the fact that
I have to overwrite the file using the same filename because I'm
unable to delete it after it's downloaded. The reason for this is
because after sending Location: urlofzipfile the script stops
processing and I can't call a file operation to delete the file. Thus
I constantly have a tmp.zip file which contains the previously
requested files.

Can anyone think of a way around this? Is there a better way to create
the zip file and present it for download on-the-fly than editing the
Location header? I thought about using Content-Type, but was unable to
think of a way to stream the file out.

Any help is appreciated, much thanks!

- James
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Re: Python CGI - Presenting a zip file to user

[Justin Ezequiel]

On Jan 3, 7:50 am, jwwest [EMAIL PROTECTED] wrote:
 Hi all,

 I'm working on a cgi script that zips up files and presents the zip
 file to the user for download. It works fine except for the fact that
 I have to overwrite the file using the same filename because I'm
 unable to delete it after it's downloaded. The reason for this is
 because after sending Location: urlofzipfile the script stops
 processing and I can't call a file operation to delete the file. Thus
 I constantly have a tmp.zip file which contains the previously
 requested files.

 Can anyone think of a way around this? Is there a better way to create
 the zip file and present it for download on-the-fly than editing the
 Location header? I thought about using Content-Type, but was unable to
 think of a way to stream the file out.

 Any help is appreciated, much thanks!

 - James

import sys, cgi, zipfile, os
from StringIO import StringIO

try: # Windows only
import msvcrt
msvcrt.setmode(sys.stdout.fileno(), os.O_BINARY)
except ImportError: pass

HEADERS = '\r\n'.join(
[
Content-type: %s;,
Content-Disposition: attachment; filename=%s,
Content-Title: %s,
Content-Length: %i,
\r\n, # empty line to end headers
]
)

if __name__ == '__main__':
os.chdir(r'C:\Documents and Settings\Justin Ezequiel\Desktop')
files = [
'4412_ADS_or_SQL_Server.pdf',
'Script1.py',
'html_files.zip',
'New2.html',
]
b = StringIO()
z = zipfile.ZipFile(b, 'w', zipfile.ZIP_DEFLATED)
for n in files:
z.write(n, n)

z.close()

length = b.tell()
b.seek(0)
sys.stdout.write(
HEADERS % ('application/zip', 'test.zip', 'test.zip', length)
)
sys.stdout.write(b.read())
b.close()

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Re: Python CGI - Presenting a zip file to user

[jwwest]

On Jan 2, 8:56 pm, Justin Ezequiel [EMAIL PROTECTED]
wrote:
 On Jan 3, 7:50 am, jwwest [EMAIL PROTECTED] wrote:



  Hi all,

  I'm working on a cgi script that zips up files and presents the zip
  file to the user for download. It works fine except for the fact that
  I have to overwrite the file using the same filename because I'm
  unable to delete it after it's downloaded. The reason for this is
  because after sending Location: urlofzipfile the script stops
  processing and I can't call a file operation to delete the file. Thus
  I constantly have a tmp.zip file which contains the previously
  requested files.

  Can anyone think of a way around this? Is there a better way to create
  the zip file and present it for download on-the-fly than editing the
  Location header? I thought about using Content-Type, but was unable to
  think of a way to stream the file out.

  Any help is appreciated, much thanks!

  - James

 import sys, cgi, zipfile, os
 from StringIO import StringIO

 try: # Windows only
 import msvcrt
 msvcrt.setmode(sys.stdout.fileno(), os.O_BINARY)
 except ImportError: pass

 HEADERS = '\r\n'.join(
 [
 Content-type: %s;,
 Content-Disposition: attachment; filename=%s,
 Content-Title: %s,
 Content-Length: %i,
 \r\n, # empty line to end headers
 ]
 )

 if __name__ == '__main__':
 os.chdir(r'C:\Documents and Settings\Justin Ezequiel\Desktop')
 files = [
 '4412_ADS_or_SQL_Server.pdf',
 'Script1.py',
 'html_files.zip',
 'New2.html',
 ]
 b = StringIO()
 z = zipfile.ZipFile(b, 'w', zipfile.ZIP_DEFLATED)
 for n in files:
 z.write(n, n)

 z.close()

 length = b.tell()
 b.seek(0)
 sys.stdout.write(
 HEADERS % ('application/zip', 'test.zip', 'test.zip', length)
 )
 sys.stdout.write(b.read())
 b.close()

Thanks! That worked like an absolute charm.

Just a question though. I'm curious as to why you have to use the
msvcrt bit on Windows. If I were to port my app to *NIX, would I need
to do anything similar?

- James
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Re: Python CGI - Presenting a zip file to user

[Justin Ezequiel]

On Jan 3, 1:35 pm, jwwest [EMAIL PROTECTED] wrote:
 Thanks! That worked like an absolute charm.

 Just a question though. I'm curious as to why you have to use the
 msvcrt bit on Windows. If I were to port my app to *NIX, would I need
 to do anything similar?

 - James

not needed for *NIX as *NIX does not have a notion of binary- vs text-
mode

I seem to recall not needing the msvcrt stuff a while ago on Windows
but recently needed it again for Python CGI on IIS
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pipes python cgi and gnupg

[byte8bits]

I think this is more a GnuPG issue than a Python issue, but I wanted
to post it here as well in case others could offer suggestions:

I can do this from a python cgi script from a browser:

os.system(gpg --version  gpg.out)

However, I cannot do this from a browser:

os.system(echo %s | gpg --batch --password-fd 0 -d %s  d.out
%(pass, filename))

The output file is produced, but it's zero byte. I want the decrypted
file's content, but the pipe seems to mess things up. The script works
fine when executed from command line. The output file is produced as
expected. When executed by a browser, it does not work as expected...
only produces a zero byte output file. Any tips? I've googled a bit
and experimented for a few nights, still no go.

Thanks,
Brad

Here's the entire script:

#!/usr/local/bin/python

import cgi
import cgitb; cgitb.enable()
import os
import tempfile

print Content-Type: text/html
print
print TITLET/TITLE
print H1H/H1

form = cgi.FieldStorage()
if not form.has_key(pass):
   print Enter password

filename = test.gpg
pass = form.getvalue(pass).strip()
os.system(gpg --version  gpg.out)
os.system(echo %s | gpg --batch --password-fd 0 --decrypt %s  d.out
%(pass,filename))
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Re: dynamically generating temporary files through python/cgi (ot)

[Hendrik van Rooyen]

Miss Pfeffe  wrote:


How do you make a python out of a banana?!

You kiss it just long enough - else it turns into a frog, so be careful!



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dynamically generating temporary files through python/cgi

[Miss Pfeffe]

How do you make a python out of a banana?!-- 
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Streaming files from python cgi

[Salil Kulkarni]

Hello,

I am trying to create a cgi which downloads a pdf/tiff file from an
ftpserver using ftplib.
Everything works until this point.
But, once the file has been retrieved, I want to be able to stream the file
to the browser so that the user gets an option to save it, or open it with
the necessary application. However, I am not able to figure out how this can
be done.

The code looks as follows:

 #!/usr/local/python2.1/bin/python

 import Path, cgi, sys, os
 from ftplib import FTP
 print content-type: application/pdf\n\n

  ftp = FTP(hostname, salil, passwd)

  try:
  ftp.cwd(/home/salil)
  except:
  print Could change directory on remote server
  sys.exit(1)


  f = open(temp.pdf, w)
  ftp.retrbinary(RETR O_F.pdf, f.write)
  f.close()
  f = open(temp.pdf, r)
 print f.read()


I am using Apache 1.3 for this cgi. It would be great if someone can point
out how this can be accomplished, or if there are any examples out there
which I can refer to.

Thanks,
Salil.
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My first Python CGI (was: Coming from Perl)

[Cameron Laird]

In article [EMAIL PROTECTED],
Amer Neely  [EMAIL PROTECTED] wrote:
Amer Neely wrote:
 TheFlyingDutchman wrote:
 On Sep 12, 5:30 pm, Amer Neely [EMAIL PROTECTED] wrote:
 I'm a complete newbie with Python, but have several years experience
 with Perl in a web environment.

 A question I have, if someone here is familiar with Perl, does Python
 have something like Perl's 'here document'? I've just searched and read
 some postings on generating HTML but they all seem to refer to various
 template utilities. Is this the only way, or am I missing something? I'm
 used to generating X/HTML by hand, which makes the here document in Perl
 ideal for me. Also, many times a client already existing HTML code that
 I can use in a script.

 -- 
 Amer Neely
 w:www.webmechanic.softouch.on.ca/
 Perl | MySQL programming for all data entry forms.
 Others make web sites. We make web sites work!

 I am not sure if this is what you are looking for, but Python has a
 special string with 3 quotes that I believe duplicates part of the
 functionality of a here document:

 myHmtlHeader = 
 head attribute = abc
 titleMy Page/title
 /head
 

 print myHtmlHeader


 outputs:


 head attribute=abc
 titleMy Page/title
 /head

 
 Well, I have checked everything I can but I'm getting '500 Internal 
 Server Error'. The log files aren't helpful:
 [Thu Sep 13 03:43:00 2007] [error] [client 24.235.184.39] Premature end 
 of script headers: /home/softouch/public_html/cgi-bin/scratch/hello.py
 
 I can't even get it to run on my home PC running Apache + Win2K. Same 
 error.
 
 My script:
 #!/usr/bin/python
 import cgitb; cgitb.enable(display=0, logdir=.)
 import sys
 sys.stderr = sys.stdout
 print Content-Type: text/html
 print
 
 print 
 html
 body
 div align=centerfont style=font-family:verdana; size:18pxHello 
 from Python/font/div
 br
 Goodbye.
 /body
 /html
 
 

I should have added that it runs from the command line OK.
.
.
.
Yes, it should work fine.  Do the things you'd do if it were Perl source:
when you say it runs from the command line OK, do you mean invocation of
/home/softouch/public_html/cgi-bin/scratch/hello.py gives sensible results?
Does your Web server recognize that .py is a CGI extension?  What are the
permissions on /home/softouch/public_html/cgi-bin/scratch/hello.py?

Might your server have an issue with Content-Type vs. Content-type?
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Re: Python CGI and Browser timeout

[Steve Holden]

Sebastian Bassi wrote:
 On 26 Apr 2007 14:48:29 -0700, [EMAIL PROTECTED] [EMAIL PROTECTED] wrote:
 In order to work around this problem, I started printing empty strings
 (i.e. print ) so that the browser does not timeout.
 
 How do you print something while doing the query and waiting for the results?
 I saw some pages that display something like: This page will be
 updated in X seconds to show the results (X is an estimated time
 depending of server load), after a JS countdown, it refresh itself and
 show the result or another This page will be updated in X seconds to
 show the results.

The usual way is by client pull: send the content you want the user to 
see, and include a Refresh: header - the easiest way is to include a 
META tag in the html content head section like

   meta http-equiv=refresh content=N; URL=other-web-address

So the page can continually check whether the user's job is finished, if 
it isn't just sending out the same content and then when it is printing 
the details.

regards
  Steve
-- 
Steve Holden+1 571 484 6266   +1 800 494 3119
Holden Web LLC/Ltd   http://www.holdenweb.com
Skype: holdenweb  http://del.icio.us/steve.holden
-- Asciimercial -
Get Python in your .sig and on the web. Blog and lens
holdenweb.blogspot.comsquidoo.com/pythonology
tag items:del.icio.us/steve.holden/python
All these services currently offer free registration!
-- Thank You for Reading 

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Re: Python CGI and Browser timeout

[Steve Holden]

Steve Holden wrote:
 Sebastian Bassi wrote:
 On 26 Apr 2007 14:48:29 -0700, [EMAIL PROTECTED] [EMAIL PROTECTED] wrote:
 In order to work around this problem, I started printing empty strings
 (i.e. print ) so that the browser does not timeout.
 How do you print something while doing the query and waiting for the results?
 I saw some pages that display something like: This page will be
 updated in X seconds to show the results (X is an estimated time
 depending of server load), after a JS countdown, it refresh itself and
 show the result or another This page will be updated in X seconds to
 show the results.
 
 The usual way is by client pull: send the content you want the user to 
 see, and include a Refresh: header - the easiest way is to include a 
 META tag in the html content head section like
 
meta http-equiv=refresh content=N; URL=other-web-address
 
 So the page can continually check whether the user's job is finished, if 
 it isn't just sending out the same content and then when it is printing 
 the details.
 
I should have pointed out that N is the number of seconds to wait before 
refreshing.

regards
  Steve
-- 
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Holden Web LLC/Ltd   http://www.holdenweb.com
Skype: holdenweb  http://del.icio.us/steve.holden
-- Asciimercial -
Get Python in your .sig and on the web. Blog and lens
holdenweb.blogspot.comsquidoo.com/pythonology
tag items:del.icio.us/steve.holden/python
All these services currently offer free registration!
-- Thank You for Reading 

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Python CGI and Browser timeout

[skulka3]

Hello,

I am creating a simple cgi script which needs to retrieve and process
a huge number of records from the database (more than 11,000) and
write the results to a file on disk  and display some results when
processing is complete.

However, nothing needs to be displayed while the processing is on. I
was facing browser timeout issue due to the time it takes to process
these records.

In order to work around this problem, I started printing empty strings
(i.e. print ) so that the browser does not timeout.

Is there a better solution to avoid browser timeouts?

Thanks,

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Re: Python CGI and Browser timeout

[Gabriel Genellina]

En Thu, 26 Apr 2007 18:48:29 -0300, [EMAIL PROTECTED] escribió:

 I am creating a simple cgi script which needs to retrieve and process
 a huge number of records from the database (more than 11,000) and
 write the results to a file on disk  and display some results when
 processing is complete.

 However, nothing needs to be displayed while the processing is on. I
 was facing browser timeout issue due to the time it takes to process
 these records.

 In order to work around this problem, I started printing empty strings
 (i.e. print ) so that the browser does not timeout.

 Is there a better solution to avoid browser timeouts?

You could spawn another process or thread, reporting the progress  
somewhere.
Then redirect to another page showing the progress (and auto-reloading  
itself each few seconds).
When it detects that processing is complete, redirect to another page  
showing the final results.

-- 
Gabriel Genellina
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Re: Python CGI and Browser timeout

[Sebastian Bassi]

On 26 Apr 2007 14:48:29 -0700, [EMAIL PROTECTED] [EMAIL PROTECTED] wrote:
 In order to work around this problem, I started printing empty strings
 (i.e. print ) so that the browser does not timeout.

How do you print something while doing the query and waiting for the results?
I saw some pages that display something like: This page will be
updated in X seconds to show the results (X is an estimated time
depending of server load), after a JS countdown, it refresh itself and
show the result or another This page will be updated in X seconds to
show the results.



-- 
Sebastián Bassi (セバスティアン)
Diplomado en Ciencia y Tecnología.
GPG Fingerprint: 9470 0980 620D ABFC BE63 A4A4 A3DE C97D 8422 D43D
Club de la razón (www.clubdelarazon.org)
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Re: Python CGI and Browser timeout

[Sebastian Bassi]

On 26 Apr 2007 14:48:29 -0700, [EMAIL PROTECTED] [EMAIL PROTECTED] wrote:
 Is there a better solution to avoid browser timeouts?

Raising timeout in Apache, by default is 300 seconds.
Limiting jobs size (both in the html form and from script size since
you should not trust on client validations).

-- 
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Diplomado en Ciencia y Tecnología.
GPG Fingerprint: 9470 0980 620D ABFC BE63 A4A4 A3DE C97D 8422 D43D
Club de la razón (www.clubdelarazon.org)
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Re: Python CGI and Browser timeout

[skulka3]

Thanks for the response.

To further clarify the details:

I am printing the empty strings in a for loop. So the processing
happens in a loop when all the results from the query have been
already retrieved and each record is now being processed inside the
loop.

I also update the display periodically with the total number of
records processed(which is approximately after every 1/5th chunk of
the total number of records in the result).

Thanks,
Salil Kulkarni



On Apr 26, 6:01 pm, Sebastian Bassi [EMAIL PROTECTED]
wrote:
 On 26 Apr 2007 14:48:29 -0700, [EMAIL PROTECTED] [EMAIL PROTECTED] wrote:

  In order to work around this problem, I started printing empty strings
  (i.e. print ) so that the browser does not timeout.

 How do you print something while doing the query and waiting for the results?
 I saw some pages that display something like: This page will be
 updated in X seconds to show the results (X is an estimated time
 depending of server load), after a JS countdown, it refresh itself and
 show the result or another This page will be updated in X seconds to
 show the results.

 --
 Sebastián Bassi (セバスティアン)
 Diplomado en Ciencia y Tecnología.
 GPG Fingerprint: 9470 0980 620D ABFC BE63 A4A4 A3DE C97D 8422 D43D
 Club de la razón (www.clubdelarazon.org)


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