Lamson 0.9.3 Is Out And Sexy As Hell

This release is the result of me working on my little project while tweaking and refining
Lamson as I go. The end result is 0.9.3 didn’t have a lot of big code changes,
but all the tiny little changes add up to a very nice release. The highlights
of this release are more secure server runs, better character encoding handling
for headers, various cleanups in how mail is queued, and fixes for Python 2.6

My plan is to keep using this release, improving what is there currently and
only adding minimal features, and just making what is there tighter. The goal
is to have a 1.0 release out once I’ve used it on and the new mailing lists application.

Getting It (As Usual)

All you need to do to get lamson is read the download instruction
and then go through the getting started to try it out.

The docs may be out of date with this release, but I’m going through docs tomorrow.

NYLUG Python Workshop Tuesday June 09 6:00PM-8:00PM

I’ll be presenting Lamson at the NYLUG Python Workshop Tuesday June 09 6:00PM-8:00PM
and helping people get started with it. If you wanted to try it but didn’t want
to waste the time then come down and I’ll hook you up.

OneShotBlog Sample Is Live

Lamson includes the source to the project
in the examples/osb directory. You can grab the source tar.gz
and look in there fore the source. You should also try out the sample site to help
test out Lamson, especially if you use a weird character set (since that’s the biggest
weakness currently).

This release of OSB features a bunch of bug fixes, tons of tests that improve the code
coverage, the ability to comment on a post by sending an email, decent spam filtering
of the comments, ability to flag a comment as spam, and lots of little tweaks. It
uses all of the features Lamson has right now.

It still has some work to do, and I want to add the ability to send pictures and source
code (with syntax highlight).

The ChangeLog

The change log for this release is (with the big ones bold):

Using The Drop Privilege

Lamson can now drop privilege after binding port 25. Previously it was too difficult
to make the python-daemonize library do it correctly, but after I reorganized some code
I was able to do the privilege drop manually to implement it. What this means is you can
run your email server and stop being root right after you bind port 25.

To do this, you’ll just run your server with:

$ sudo lamson start -uid 500 -gid 500
$ cd ..
$ sudo chown -R someuser.someuser yourapp

You technically don’t have to fix the permissions, but if you use queue receivers
then you’ll need to change the permissions back. Lamson still creates a few files as root before
dropping to your given UID and GID, but hopefully it will stop doing this soon.

Obviously, you might want to know what your UID and GID is, but it’s important that you know
what Python thinks it is:

Python 2.5.1 (r251:54863, Jan 13 2009, 10:26:13) 
[GCC 4.0.1 (Apple Inc. build 5465)] on darwin
Type “help”, “copyright”, “credits” or “license” for more information.
>>> import os
>>> os.getgid()
>>> os.getuid()

There’s other ways to find it out, but that’s the Python way.

Using lamson routes

The lamson routes command has improved a bit so that you can inspect your routing and
test out an email address to see how it would be sorted. Here’s a sample run:

osb $ lamson routes -test
2009-06-07 02:33:31,678 – root – INFO – Database configured to use sqlite:///app/data/main.db URL.
Routing ORDER: [... lots of regex here …]
Routing TABLE:
... each regex and what state functions it maps ..

TEST address '’ matches: '^(?P[a-zA-Z0-9][a-zA-Z0-9.]+)@(?Poneshotblog\\.com)$’ app.handlers.index.POSTING – {'host’: '’, 'post_name’: '’} '^(?P[a-zA-Z0-9][a-zA-Z0-9.]+)@(?Poneshotblog\\.com)$’ – {'host’: '’, 'post_name’: '’} '^(?P[a-zA-Z0-9][a-zA-Z0-9.]+)@(?Poneshotblog\\.com)$’ – {'host’: '’, 'post_name’: '’}
osb $

If you’re working with Lamson this is incredibly helpful, because it tells you what
routes you have, what functions they call, and then it’ll take an email address and
tell you all the routes that match it.

The output needs to be cleaned up, but for debugging this is nice.

The lamson web Command

While working on I kept having to
open up the site that it generates, so I just threw a dirt simple HTTP server
into Lamson. Here’s a sample of running it:

~ $ cd projects/lamson/examples/osb/
osb $ lamson web -basedir app/data/
Starting server on out of directory 'app/data/’
localhost – - [06/Jun/2009 12:31:11] “GET / HTTP/1.1” 200 – localhost – - [06/Jun/2009 12:31:11] “GET /styles/reset.css HTTP/1.1” 200 – localhost – - [06/Jun/2009 12:31:11] “GET /styles/main.css HTTP/1.1” 200 – localhost – - [06/Jun/2009 12:31:18] code 404, message File not found

It just stays there running and printing to the console, so I just use
GNU screen and leave it
running in one of the windows.

As Usual Test And Report

Test this release out, and shoot me feedback. I’m hanging on
again in the #lamson room, so just stop in if you need help.