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# Copyright (c) 2000 Gregory Trubetskoy. All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
#
# 1. Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
#
# 2. Redistributions in binary form must reproduce the above copyright
# notice, this list of conditions and the following disclaimer in
# the documentation and/or other materials provided with the
# distribution.
#
# 3. The end-user documentation included with the redistribution, if
# any, must include the following acknowledgment: "This product
# includes software developed by Gregory Trubetskoy."
# Alternately, this acknowledgment may appear in the software itself,
# if and wherever such third-party acknowledgments normally appear.
#
# 4. The names "mod_python", "modpython" or "Gregory Trubetskoy" must not
# be used to endorse or promote products derived from this software
# without prior written permission. For written permission, please
# contact grisha@modpython.org.
#
# 5. Products derived from this software may not be called "mod_python"
# or "modpython", nor may "mod_python" or "modpython" appear in their
# names without prior written permission of Gregory Trubetskoy.
#
# THIS SOFTWARE IS PROVIDED BY GREGORY TRUBETSKOY ``AS IS'' AND ANY
# EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
# PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL GREGORY TRUBETSKOY OR
# HIS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
# NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
# LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
# STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
# OF THE POSSIBILITY OF SUCH DAMAGE.
# ====================================================================
#
# $Id: cgihandler.py,v 1.9 2000/12/06 03:05:37 gtrubetskoy Exp $
import apache
import imp
import os
import sys
# if threads are not available
# create a functionless lock object
try:
import threading
_lock = threading.Lock()
except (ImportError, AttributeError):
class DummyLock:
def acquire(self):
pass
def release(self):
pass
_lock = DummyLock()
# the next statement deserves some explaining.
# it seems that the standard os.environ object looses
# memory if the environment is manipulated frequently. Since for
# CGI you have to rebuild it for every request, your httpd will
# grow rather fast. I am not exactly sure why it happens and if there
# is a more sensible remedy, but this seems to work OK.
os.environ = {}
original = sys.modules.keys()
# find out the standard library location
stdlib, x = os.path.split(os.__file__)
def handler(req):
### if you don't need indirect modules reloaded, comment out
### code unitl ### end
# if there are any new modules since the import of this module,
# delete them.
for m in sys.modules.keys():
if m not in original:
# unless they are part of standard library
mod = sys.modules[m]
if hasattr(mod, "__file__"):
path, x = os.path.split(mod.__file__)
if path != stdlib:
del sys.modules[m]
### end
# get the filename of the script
if req.subprocess_env.has_key("script_filename"):
dir, file = os.path.split(req.subprocess_env["script_filename"])
else:
dir, file = os.path.split(req.filename)
module_name, ext = os.path.splitext(file)
_lock.acquire()
try:
try:
# The CGI spec requires us to set current working
# directory to that of the script. This is not
# thread safe, this is why we must obtain the lock.
cwd = os.getcwd()
os.chdir(dir)
# simulate cgi environment
env, si, so = apache.setup_cgi(req)
try:
# we do not search the pythonpath (security reasons)
fd, path, desc = imp.find_module(module_name, [dir])
except ImportError:
raise apache.SERVER_RETURN, apache.HTTP_NOT_FOUND
# this executes the module
imp.load_module(module_name, fd, path, desc)
return apache.OK
finally:
# unsimulate the cgi environment
apache.restore_nocgi(env, si, so)
try:
fd.close()
except: pass
os.chdir(cwd)
finally:
_lock.release()
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