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Building an alarm clock
                         with node.js
                                 or


                     Hacking vs. Engineering
 Felix Geisendörfer                       29.09.2011 (v1)
Donnerstag, 29. September 2011
Text
                                  Welcome to the Siesta
                                 right-after-lunch Session!
Donnerstag, 29. September 2011
Building an alarm clock
                         with node.js
                                 or


                     Hacking vs. Engineering
 Felix Geisendörfer                       29.09.2011 (v1)
Donnerstag, 29. September 2011
@felixge

                                 Twitter / GitHub / IRC


Donnerstag, 29. September 2011
My Problem

                    • Getting up early in the morning

                    • That means before 12:00 (noon)


Donnerstag, 29. September 2011
This talk

                    • How I solved this problem

                    • Hacking vs. Engineering the solution


Donnerstag, 29. September 2011
Patient History

                    • 23 years

                    • Working from home

                    • Can work any hours

Donnerstag, 29. September 2011
So why get up early?


                    • To get more stuff done ...



Donnerstag, 29. September 2011
Previous attempts



Donnerstag, 29. September 2011
Text

                                 Behavioral Conditioning
Donnerstag, 29. September 2011
Text

                                 Flying alarm clock
Donnerstag, 29. September 2011
Text

             Circadian rhythm app (Sleep Cycle)
Donnerstag, 29. September 2011
Text

                                 Many alarms
Donnerstag, 29. September 2011
Nothing was working



Donnerstag, 29. September 2011
Text



Donnerstag, 29. September 2011
Donnerstag, 29. September 2011
Donnerstag, 29. September 2011
Donnerstag, 29. September 2011
Donnerstag, 29. September 2011
VLC
Donnerstag, 29. September 2011
pmset
Donnerstag, 29. September 2011
The Script


       https://gist.github.com/1a40a207cf6132f77efa




Donnerstag, 29. September 2011
sudo ./alarm.js 7 30


Donnerstag, 29. September 2011
Donnerstag, 29. September 2011
Result

                    • Reliably waking up at any time

                    • Get to choose different music every night


Donnerstag, 29. September 2011
Hacking vs. Engineering



Donnerstag, 29. September 2011
(Software) Engineering


                     “Rigorous application of science”




Donnerstag, 29. September 2011
Hacking


                                 “Playful cleverness”




Donnerstag, 29. September 2011
Hacking vs. Engineering
           this project


Donnerstag, 29. September 2011
Tests?

                                 Engineering: Yes


                                 Hacking: Maybe



Donnerstag, 29. September 2011
Airtunes?
                                    Engineering:

                                 Implement protocol

                                      Hacking:

                            Piggyback on iTunes or VLC
Donnerstag, 29. September 2011
Code
   var file = '/my/music/file.mp3';
   var vlcPath = '/Applications/VLC.app/Contents/MacOS/VLC';
   var vlc = spawn(vlcPath, [
     '-R',
     '--sout=#transcode {acodec = alac channels = 2, samplerate =
   44100}: raop{host=10.0.1.13,volume=255}',
     file
   ]);

   vlc.stdout.setEncoding('utf8');
   vlc.stderr.setEncoding('utf8');
   vlc.stdout.on('data', process.stdout.write);
   vlc.stderr.on('data', process.stderr.write);

   vlc.on('exit', function(code, signal) {
     console.log('vlc exit: %i %s', code, signal);
   });

Donnerstag, 29. September 2011
Wakeup from Sleep?
                                 Engineering:

    pmset schedule wakeorpoweron <datetime>

                                  Hacking:

     pmset schedule wakeorpoweron MTWRFSU
                      <time>
Donnerstag, 29. September 2011
Code
   var powerCmd = sprintf(
      'pmset repeat wakeorpoweron MTWRFSU %02d:%02d:00',
      powerHour,
      powerMinute
   );

   exec(powerCmd, function(err) {
     if (err) throw err;
     process.setuid('felix');
   });




Donnerstag, 29. September 2011
Turn off speakers?
                                      Engineering:

                   Install speakers in unreachable place.


                                      Hacking: ?


Donnerstag, 29. September 2011
Text

                                 Duct Tape
Donnerstag, 29. September 2011
Duct Tape of Concurrent I/O
Donnerstag, 29. September 2011
Engineering Solution for Concurrency
Donnerstag, 29. September 2011
Why am I talking about this?



Donnerstag, 29. September 2011
JS has a very hacker-driven
                                 culture


Donnerstag, 29. September 2011
Text

                                 Duct tape of the web
Donnerstag, 29. September 2011
Text

                                 Duct tape of the DOM
Donnerstag, 29. September 2011
• Hacking is lots of fun, go do it!

                    • Hacking can be a good solution!

                    • But be aware that many problems call for
                           an engineering approach.




Donnerstag, 29. September 2011
Where we need more
                                    engineering:

                    • Libraries

                    • Domain logic

                    • Performance

Donnerstag, 29. September 2011
TL;DL

                    • Hack when in doubt

                    • Engineer when clear


Donnerstag, 29. September 2011
Hacking Engineering




Donnerstag, 29. September 2011
Questions?




                                    @felixge
Donnerstag, 29. September 2011

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Building an alarm clock with node.js

  • 1. Building an alarm clock with node.js or Hacking vs. Engineering Felix Geisendörfer 29.09.2011 (v1) Donnerstag, 29. September 2011
  • 2. Text Welcome to the Siesta right-after-lunch Session! Donnerstag, 29. September 2011
  • 3. Building an alarm clock with node.js or Hacking vs. Engineering Felix Geisendörfer 29.09.2011 (v1) Donnerstag, 29. September 2011
  • 4. @felixge Twitter / GitHub / IRC Donnerstag, 29. September 2011
  • 5. My Problem • Getting up early in the morning • That means before 12:00 (noon) Donnerstag, 29. September 2011
  • 6. This talk • How I solved this problem • Hacking vs. Engineering the solution Donnerstag, 29. September 2011
  • 7. Patient History • 23 years • Working from home • Can work any hours Donnerstag, 29. September 2011
  • 8. So why get up early? • To get more stuff done ... Donnerstag, 29. September 2011
  • 10. Text Behavioral Conditioning Donnerstag, 29. September 2011
  • 11. Text Flying alarm clock Donnerstag, 29. September 2011
  • 12. Text Circadian rhythm app (Sleep Cycle) Donnerstag, 29. September 2011
  • 13. Text Many alarms Donnerstag, 29. September 2011
  • 14. Nothing was working Donnerstag, 29. September 2011
  • 22. The Script https://gist.github.com/1a40a207cf6132f77efa Donnerstag, 29. September 2011
  • 23. sudo ./alarm.js 7 30 Donnerstag, 29. September 2011
  • 25. Result • Reliably waking up at any time • Get to choose different music every night Donnerstag, 29. September 2011
  • 27. (Software) Engineering “Rigorous application of science” Donnerstag, 29. September 2011
  • 28. Hacking “Playful cleverness” Donnerstag, 29. September 2011
  • 29. Hacking vs. Engineering this project Donnerstag, 29. September 2011
  • 30. Tests? Engineering: Yes Hacking: Maybe Donnerstag, 29. September 2011
  • 31. Airtunes? Engineering: Implement protocol Hacking: Piggyback on iTunes or VLC Donnerstag, 29. September 2011
  • 32. Code var file = '/my/music/file.mp3'; var vlcPath = '/Applications/VLC.app/Contents/MacOS/VLC'; var vlc = spawn(vlcPath, [ '-R', '--sout=#transcode {acodec = alac channels = 2, samplerate = 44100}: raop{host=10.0.1.13,volume=255}', file ]); vlc.stdout.setEncoding('utf8'); vlc.stderr.setEncoding('utf8'); vlc.stdout.on('data', process.stdout.write); vlc.stderr.on('data', process.stderr.write); vlc.on('exit', function(code, signal) { console.log('vlc exit: %i %s', code, signal); }); Donnerstag, 29. September 2011
  • 33. Wakeup from Sleep? Engineering: pmset schedule wakeorpoweron <datetime> Hacking: pmset schedule wakeorpoweron MTWRFSU <time> Donnerstag, 29. September 2011
  • 34. Code var powerCmd = sprintf( 'pmset repeat wakeorpoweron MTWRFSU %02d:%02d:00', powerHour, powerMinute ); exec(powerCmd, function(err) { if (err) throw err; process.setuid('felix'); }); Donnerstag, 29. September 2011
  • 35. Turn off speakers? Engineering: Install speakers in unreachable place. Hacking: ? Donnerstag, 29. September 2011
  • 36. Text Duct Tape Donnerstag, 29. September 2011
  • 37. Duct Tape of Concurrent I/O Donnerstag, 29. September 2011
  • 38. Engineering Solution for Concurrency Donnerstag, 29. September 2011
  • 39. Why am I talking about this? Donnerstag, 29. September 2011
  • 40. JS has a very hacker-driven culture Donnerstag, 29. September 2011
  • 41. Text Duct tape of the web Donnerstag, 29. September 2011
  • 42. Text Duct tape of the DOM Donnerstag, 29. September 2011
  • 43. • Hacking is lots of fun, go do it! • Hacking can be a good solution! • But be aware that many problems call for an engineering approach. Donnerstag, 29. September 2011
  • 44. Where we need more engineering: • Libraries • Domain logic • Performance Donnerstag, 29. September 2011
  • 45. TL;DL • Hack when in doubt • Engineer when clear Donnerstag, 29. September 2011
  • 47. Questions? @felixge Donnerstag, 29. September 2011