Changes between Version 2 and Version 3 of TracModWSGI

Timestamp:

13/04/2010 13:24:09 (15 years ago)

Author:

trac

Comment:

--

TracModWSGI

@@ -1 +1 @@
 = Trac and mod_wsgi =
 
-'''Important note:''' ''Please use either version 1.3 or 2.3 or later of `mod_wsgi`. Version 2.0 has problems with downloading attachments (see [trac:ticket:7205 #7205]).''
+'''Important note:''' ''Please use either version 1.6, 2.4 or later of `mod_wsgi`. Versions prior to 2.4 in the 2.X branch have problems with some Apache configurations that use WSGI file wrapper extension. This extension is used in Trac to serve up attachments and static media files such as style sheets. If you are affected by this problem attachments will appear to be empty and formatting of HTML pages will appear not to work due to style sheet files not loading properly. See mod_wsgi tickets [http://code.google.com/p/modwsgi/issues/detail?id=100 #100] and [http://code.google.com/p/modwsgi/issues/detail?id=132 #132].''
 
-[http://code.google.com/p/modwsgi/ mod_wsgi] is an Apache module for running WSGI-compatible Python applications directly on top of Apache:
+[http://code.google.com/p/modwsgi/ mod_wsgi] is an Apache module for running WSGI-compatible Python applications directly on top of Apache. The mod_wsgi adapter is written completely in C and provides significantly better performance than using existing WSGI adapters for mod_python or CGI.
 
-  The mod_wsgi adapter is an Apache module that provides a WSGI compliant interface for hosting Python based web applications within Apache. The adapter is written completely in C code against the Apache C runtime and for hosting WSGI applications within Apache provides significantly better performance than using existing WSGI adapters for mod_python or CGI.
-
-It is already possible to run Trac on top of mod_wsgi. This can be done by writing the following application script, which is just a Python file, though usually saved with a .wsgi extension).
+Trac can be run on top of mod_wsgi with the help of the following application script, which is just a Python file, though usually saved with a .wsgi extension). This file can be created using '''trac-admin <env> deploy <dir>''' command which automatically substitutes required paths.
 
 {{{
+#!python
 import os
 
@@ -19 +18 @@
 }}}
 
-The {{{TRAC_ENV}}} variable should naturally be the directory for your Trac environment (if you have several Trac environments in a directory, you can also use {{{TRAC_ENV_PARENT_DIR}}} instead), while the {{{PYTHON_EGG_CACHE}}} should be a directory where Python can temporarily extract Python eggs. [[BR]]
-For clarity, you should give this file a {{{.wsgi}}} extension. You should probably put the file in it's own directory, since you will open up its directory to Apache.
-You can create a .wsgi files which handles all this for you by running the TracAdmin command {{{deploy}}}.
+The `TRAC_ENV` variable should naturally be the directory for your Trac environment (if you have several Trac environments in a directory, you can also use `TRAC_ENV_PARENT_DIR` instead), while the `PYTHON_EGG_CACHE` should be a directory where Python can temporarily extract Python eggs.
+
+'''Important note:''' If you're using multiple `.wsgi` files (for example one per Trac environment) you must ''not'' use `os.environ['TRAC_ENV']` to set the path to the Trac environment. Using this method may lead to Trac delivering the content of another Trac environment. (The variable may be filled with the path of a previously viewed Trac environment.) To solve this problem, use the following `.wsgi` file instead:
+
+{{{
+#!python
+import os
+
+os.environ['PYTHON_EGG_CACHE'] = '/usr/local/trac/mysite/eggs'
+
+import trac.web.main
+def application(environ, start_response):
+  environ['trac.env_path'] = '/usr/local/trac/mysite' 
+  return trac.web.main.dispatch_request(environ, start_response)
+}}}
+
+For clarity, you should give this file a `.wsgi` extension. You should probably put the file in it's own directory, since you will open up its directory to Apache. You can create a .wsgi files which handles all this for you by running the TracAdmin command `deploy`.
 
 If you have installed trac and eggs in a path different from the standard one you should add that path by adding the following code on top of the wsgi script:
+
 {{{
+#!python
 import site
 site.addsitedir('/usr/local/trac/lib/python2.4/site-packages')
 }}}
+
 Change it according to the path you installed the trac libs at.
 
@@ -55 +71 @@
 
 For troubleshooting tips, see the [TracModPython#Troubleshooting mod_python troubleshooting] section, as most Apache-related issues are quite similar, plus discussion of potential [http://code.google.com/p/modwsgi/wiki/ApplicationIssues application issues] when using mod_wsgi.
+
+''Note: using mod_wsgi 2.5 and Python 2.6.1 gave an Internal Server Error on my system (Apache 2.2.11 and Trac 0.11.2.1). Upgrading to Python 2.6.2 (as suggested [http://www.mail-archive.com/modwsgi@googlegroups.com/msg01917.html here]) solved this for me[[BR]]-- Graham Shanks''
 
 == Trac with PostgreSQL ==