[Zope] Zope and mod_python

[Pascal Peregrina]

Hi,

I have successfully (I think) integrated Zope with Apache/mod_python, just
to make some tests.

I would like to know if you think that this can be interesting in terms of
performance (specially number of simultaneous requests being handled,
compared to one "real" Zope instance, even with number of threads
increased).

Sorry in advance if I missed something important and if this is not
interesting at all :)

By now I have not been able to get the logging working, and I am not
completely sure about clean shutdown when Apache is stopped, but I will
continue investigating...

Software :
+ httpd-2.0.52
+ mod_python-3.1.3
+ Python-2.3.4
+ psyco-1.4 (only to use Zope Speedpack product)
+ Zope 2.7.4
+ Several Zope products (Localizer, CMF 1.5.0, ...)

Architecture :
+ One Zeo instance
+ Apache / mod_python
and that's all :)

I created a zhandler package (very first draft) containing : 
+ __init__.py : Zope init
+ zhandler.py : the handler itself (it uses ZPublisher)

Then, from standard build/install/configuration of all the software above,
this is the configuration changes I did :
+ Created a Zeo instance 
+ httpd.conf (global settings) :
SetHandler mod_python
PythonInterpreter zinterpreter
PythonHandler zhandler.zhandler
PythonDebug On
+ and this is the zope.conf file (I called it zhandler.conf) I used
(basically it only consisted in removing all <server> occurences) :
############################################################################
###
# Welcome to Zope 2.
############################################################################
###
#
# This is the Zope configuration file.  The Zope configuration file
# shows what the default configuration directives are, and show
# examples for each directive.  To declare a directive, make sure that
# you add it to a line that does not begin with '#'.  Note that comments
# are only allowed at the beginning of a line: you may not add comments
# after directive text on the same line.

# ZConfig "defines" used for later textual substitution

%define INSTANCE /export/home/pperegri/20050203/instances/zope_rw
%define ZOPE /export/home/pperegri/20050203/opt/Zope-2.7.4-0

instancehome $INSTANCE
products /export/home/pperegri/20050203/opt/Products
debug-mode off
zeo-client-name zcmd

<eventlog>
  level all
  <logfile>
    path $INSTANCE/log/cmdline_event.log
    level info
  </logfile>
</eventlog>

<logger access>
  level WARN
  <logfile>
    path $INSTANCE/log/cmdline_Z2.log
    format %(message)s
  </logfile>
</logger>

<zodb_db temporary>
    mount-point /temp_folder
    <temporarystorage>
      name sessions
    </temporarystorage>
    container-class Products.TemporaryFolder.TemporaryContainer
</zodb_db>

<zodb_db remote>
    mount-point /
    cache-size 40000
   <zeoclient>
     cache-size 256MB
     server 192.168.11.163:9001
     read-only off
     storage 1
     name zeostorage
     var $INSTANCE/var
   </zeoclient>
</zodb_db>


+ __init.py__
__all__ = ['zhandler']

zope_pythonpath='/export/home/pperegri/20050203/opt/Zope-2.7.4-0/lib/python'
zope_conf='/export/home/pperegri/test/conf/zhandler.conf'

import sys
if not zope_pythonpath in sys.path:
    sys.path.append(zope_pythonpath)

import Zope
if not Zope._began_startup:
    Zope.configure('/export/home/pperegri/test/conf/zhandler.conf')
    Zope.app()


+ zhandler.py
import mod_python.apache
import os
import sys

# this will save memory
#os.environ = {}

import ZPublisher

class ZopeStdout(mod_python.apache.NullIO):

    """
    Class that allows writing to the socket directly for Zope.
    """

    def __init__(self, req):
        self.req = req
        self.pos = 0

    def write(self, result):
        if not result or self.pos: return
        pos1=result.find('\r\n\r\n')
        pos2=result.find('\n\n')
        if pos1!=-1 and pos2!=-1 and pos1>pos2:
            ss = result.split('\n\n', 1)
        else:
            ss = result.split('\r\n\r\n', 1)
            if len(ss) < 2:
                ss = result.split('\n\n', 1)
        ss[0]=ss[0].replace('\r\n', '\n')
        for line in ss[0].split('\n'):
            if line.find(':')!=-1:
                h,v=line.split(':',1)
                if h.lower() == "status":
                    status = int(v.split()[0])
                    self.req.status = status
                elif h.lower() == "content-type":
                    self.req.content_type = v
                    self.req.headers_out[h] = v
                else:
                    self.req.headers_out.add(h, v)
        if len(ss)==2:
            self.req.write(ss[1])
            self.pos+=len(ss[1])

    def tell(self): return self.pos

def handler(req):
    save_env, si, so = mod_python.apache.setup_cgi(req)
    sys.stdout = ZopeStdout(req)
    if 'REQUEST_URI' in os.environ:
        os.environ['PATH_INFO']=os.environ['REQUEST_URI'].split('?')[0]
        os.environ['PATH_TRANSLATED']=os.environ['PATH_INFO']
    if 'HTTP_CONNECTION' in os.environ:
        os.environ['CONNECTION_TYPE']=os.environ['HTTP_CONNECTION']
    os.environ['SCRIPT_NAME']=''
    names=os.environ.keys()
    for name in names:
        if not name.startswith('HTTP_') and not name.startswith('PATH_') and
not name.startswith('SERVER_') and not name in
['CONNECTION_TYPE','GATEWAY_INTERFACE','REQUEST_METHOD','REMOTE_ADDR','SCRIP
T_NAME','QUERY_STRING']:
            del os.environ[name]
    try:
        ZPublisher.publish_module('Main', stdin=sys.stdin,
                                  stdout=sys.stdout, stderr=sys.stderr,
                                  environ=os.environ)
    finally:
        mod_python.apache.restore_nocgi(save_env, si, so)
    return mod_python.apache.OK

Pascal


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