Scaling telephony

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Nishad Musthafa

My Talk at Pycon

Technologie

Scaling Telephony
with Python:The
Plivo Learnings
Nishad Musthafa
Plivo Inc
Saturday, July 6, 13

About me
• First engineer at Plivo
• Dig open source
• Zen of python
• twitter.com/_nishad
Saturday, July 6, 13

Plivo Open Source
github.com/plivo/plivoframework/
ESL
Saturday, July 6, 13

How does plivo work?
• Plivo gets a call.
• Plivo needs to know what to do ?
• Plivo uses a callback like http://
customercallback.com/
Saturday, July 6, 13

Initial setup
Media Server
DB
Customer
API calls
Callbacks
Saturday, July 6, 13

Issues with this setup
• Business logic vs Telephony
• Code updates
• Scaling Issues
Saturday, July 6, 13

Solution
Media Server
DBCustomer
API calls
Callbacks
Django
Saturday, July 6, 13

Did that solve it?
Yes
Did we go ahead and
use it?
Not quiet.
Saturday, July 6, 13

There are still issues
• Performance issues with Django
• Security issues
Saturday, July 6, 13

Enter proxy
• A lightweight proxy server written in ﬂask
• This acts as both an in and out proxy
• Has the goodness of gevent
Saturday, July 6, 13

Solution
Media Server
DB
Customer
API calls
Proxy
DjangoCallbacks
Saturday, July 6, 13

So far so good
• Added a django based UI for our existing
customers to add and manipulate their user
related data.
• There was no current need for an api for
manipulation of these data or so we
thought.
Saturday, July 6, 13

New Customer Alert!!
• We had a new customer who urgently
needed a bunch of api’s ready in a week to
migrate a large number of minutes to our
platform.
• We didn’t have any API’s
• We had one week. It wasn’t a friendly mail.
It was an ultimatum
Saturday, July 6, 13

Tasty Pie to the rescue
• Tasty pie from toast driven is an excellent
framework to create an API from your
django models.We also did evaluate piston.
But there were basic issues there.
Saturday, July 6, 13

Piston is lacking
• /Account/id/Subaccount/
• /Account/subaccountid/
• The above two are apis on the same model
• Piston doesn’t let you do this.
Saturday, July 6, 13

Tasty Pie Basics
Resource
Retrieve List
Retrieve Detail
Saturday, July 6, 13

Tasty Pie Basics
Create
Update
Delete
Saturday, July 6, 13

Tasty Pie Best Practices
• Derive ModelResource to create a
Resource type that’s speciﬁc to your use
case. Eg: Error returning.
• Dehydrate: Use the Resource’s dehydrate
function to add data that isn’t available in
the models. Eg: cost as a sum of 2 ﬁelds
• Filters:The build_ﬁlters function allows you
specify ﬁlters based on ﬁelds of models. Be
careful using them.
Saturday, July 6, 13

Speedups
• Johnny Cache
• Django celery
Saturday, July 6, 13

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Scaling telephony

1. Scaling Telephony with Python:The Plivo Learnings Nishad Musthafa Plivo Inc Saturday, July 6, 13

2. About me • First engineer at Plivo • Dig open source • Zen of python • twitter.com/_nishad Saturday, July 6, 13

3. Plivo Open Source github.com/plivo/plivoframework/ ESL Saturday, July 6, 13

4. How does plivo work? • Plivo gets a call. • Plivo needs to know what to do ? • Plivo uses a callback like http:// customercallback.com/ Saturday, July 6, 13

5. Initial setup Media Server DB Customer API calls Callbacks Saturday, July 6, 13

6. Issues with this setup • Business logic vs Telephony • Code updates • Scaling Issues Saturday, July 6, 13

7. Solution Media Server DBCustomer API calls Callbacks Django Saturday, July 6, 13

8. Did that solve it? Yes Did we go ahead and use it? Not quiet. Saturday, July 6, 13

9. There are still issues • Performance issues with Django • Security issues Saturday, July 6, 13

10. Enter proxy • A lightweight proxy server written in ﬂask • This acts as both an in and out proxy • Has the goodness of gevent Saturday, July 6, 13

11. Solution Media Server DB Customer API calls Proxy DjangoCallbacks Saturday, July 6, 13

12. So far so good • Added a django based UI for our existing customers to add and manipulate their user related data. • There was no current need for an api for manipulation of these data or so we thought. Saturday, July 6, 13

13. New Customer Alert!! • We had a new customer who urgently needed a bunch of api’s ready in a week to migrate a large number of minutes to our platform. • We didn’t have any API’s • We had one week. It wasn’t a friendly mail. It was an ultimatum Saturday, July 6, 13

14. Tasty Pie to the rescue • Tasty pie from toast driven is an excellent framework to create an API from your django models.We also did evaluate piston. But there were basic issues there. Saturday, July 6, 13

15. Piston is lacking • /Account/id/Subaccount/ • /Account/subaccountid/ • The above two are apis on the same model • Piston doesn’t let you do this. Saturday, July 6, 13

16. Tasty Pie Basics Resource Retrieve List Retrieve Detail Saturday, July 6, 13

17. Tasty Pie Basics Create Update Delete Saturday, July 6, 13

18. Tasty Pie Best Practices • Derive ModelResource to create a Resource type that’s specific to your use case. Eg: Error returning. • Dehydrate: Use the Resource’s dehydrate function to add data that isn’t available in the models. Eg: cost as a sum of 2 fields • Filters:The build_filters function allows you specify filters based on fields of models. Be careful using them. Saturday, July 6, 13

19. Speedups • Johnny Cache • Django celery Saturday, July 6, 13

20. One week later Saturday, July 6, 13

21. Questions anyone? Saturday, July 6, 13

22. Thank you!! Saturday, July 6, 13