1. happs intro
2. the missing happs documentation
3. getting started with happs
4. prerequisites
5. cabal install me
6. main
7. url handling
8. templates
9. stringtemplate basics
10. debugging
11. form data: get and post
12. form data: file uploads
13. cookies
14. introduction to macid
15. using macid safely
16. macid dummy data
17. macid updates and queries
18. changing the data model
19. macid stress test
20. limitations of macid
21. foreign characters
22. cron jobs
23. thanks
24. appendix (floundering in ghci)

Start HAppS Automatically At Boot Time

What happens if your HAppS deployment server experiences a power outage?

Or what if the HAppS process just dies for mysterious reasons?

The way I deal with this both these issues with a public-facing happs application is to have a cron job that runs every minute, that will start the happs application if it isn't running.

thartman@thartman-laptop:~/happs-tutorial>crontab -l
* * * * * /home/thartman/happs-tutorial/happs-tutorial.cron.sh

thartman@thartman-laptop:~/happs-tutorial>cat happs-tutorial.cron.sh
# this is a workaround to a problem that my happs app dies for reasons described at
# http://code.google.com/p/happs/issues/detail?id=40
# generate the executable first by running runServer.sh
# then add this file to your crontab so you have something like
# thartman@thartman-laptop:~>crontab -l
# * * * * * /home/thartman/happs-tutorial/happs-tutorial.cron.sh

if [ -z "`pgrep happs-tutorial`" ];
then cd ~/happs-tutorial
./happs-tutorial >happs-tutorial.cron.out 2>happs-tutorial.cron.err
fi