EuroPython 2013

1. agile.open.connected
Celery And The Social Networks
5 Things I Have Learned During
Earthquake Hackathon Andrew Mleczko

2. Andrew Mleczko
Python Dev
RedTurtle - Italy - Poland
amleczko@redturtle.it
@amleczko
www.redturtle.it
Andrew Mleczko

3. May, 20th - the earthquake

4. the earthquake

5. the earthquake

6. the earthquake
this is not “parmesan”
this is real italian PARMIGIANO
;-D

7. re-start, do it fast!

8. and the real needs
the virtual idea

9. focus on storytelling

10. keep attention alive
online resources
newspapers
radio
television

11. EARTHQUAKE 20/5
first idea 24/5engage stakeholders
collect specs 28/5
get the server
placeholder page 27/5
design layout 4/6
hackaton 11-14/6
find companies
GOLIVE 26/6
36 days from event

12. facciamoadesso.it was born ;-)

13. simply use
social networks
but...

14. Speed
Rate Limits
Stability

15. Celery can fix
all off it!

16. view from the top

17. The website architecture
Notification App (REST)
website
stories
ecommerce
companies
products
news
SMS Social
Networks
email
github.com/RedTurtle/
restarter.buildout
+

18. companies sell products

19. company profile

20. the product

21. book it!

22. The website architecture
Notification App (REST)
website
stories
ecommerce
companies
products
news
SMS Social
Networks
email
github.com/RedTurtle/
restarter.buildout
+

23. how to organize tasks?

24. how to organize tasks?
small
atomic
minimal state

25. how to organize tasks?
@task
def post_on_wall(facebook_id, message):
params = {}
params['id'] = facebook_id
params['message'] = message
response = requests.post(url, params=params)

26. how to organize tasks?
@task
def send_sms(login, password, message, phone):
payload = {'login': login,
'password': password,
'phone': phone,
'body' : message }
try:
r = requests.get('%s/send' % GATEWAY,
params=payload,
timeout=TIMEOUT)
except requests.exceptions.Timeout as e:
send_sms.retry(e, countdown=3)

27. rate limits

28. rate limits
# make sure to not hit 3rd party limits
@task(rate_limit=’1/m’)
def send_sms(login, password, message, phone):
...

29. rate limits
# make sure we will never spam our wall
@task(rate_limit=’5/h’)
def post_on_wall(facebook_id, message):
params = {}
params['id'] = facebook_id
params['message'] = message
response = requests.post(url, params=params)

30. rate limits gotchas
➡ Fails on worker daemon restart
➡ Doesn’t work with multiple worker daemons
➡ External rate limits are based on many factors:
➡ who’s asking
➡ public/private info
➡ what feature

31. rate limits gotchas
https://api.twitter.com/1/account/settings.json
'x-ratelimit-class': 'api_identified',
'x-ratelimit-limit': '350',
'x-ratelimit-remaining': '257'
https://api.twitter.com/1/users/search.json?q=europython
'x-featureratelimit-class': 'usersearch',
'x-featureratelimit-limit': '180',
'x-featureratelimit-remaining': '179'

32. social network
facebook.com/facciamoadesso
@facciamoadesso

33. the results
on facebook

34. lessons learned

35. Grazie. Thank you.

36. Questions ?
Andrew Mleczko
Python Dev
Plone Framework Team member
amleczko@redturtle.it
tw: @amleczko

37. Credits
http://www.flickr.com/photos/mgstyer/5083898608
http://www.flickr.com/photos/55483178@N02/5260890765
See also:
http://blog.redturtle.it/redturtle/earthquake-plone-to-the-rescue