Twilio Signal 2016 API Architecture

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Twilio Inc

Rearchitecting the Twilio App for Scale

Software

a
REARCHITECTING THE TWILIO API FOR
SCALE
SAM KITAJIMA-KIMBREL |

SAM KITAJIMA-KIMBREL |
EVERY COMMUNICATION COUNTS

SAM KITAJIMA-KIMBREL |
I’M SAM. I WORKED ON THIS.

SAM KITAJIMA-KIMBREL |
WHAT EVEN IS AVAILABILITY?

SAM KITAJIMA-KIMBREL |
api.twilio.com
…Calls Messages Numbers

REST API: 2013
SAM KITAJIMA-KIMBREL |
99.5%
AVAILABLE
1000 RPS

REST API: TODAY
SAM KITAJIMA-KIMBREL |
99.9994%
AVAILABLE
5000 RPS

SAM KITAJIMA-KIMBREL |
TWILIO API:
PAST AND PRESENT

ORIGINAL TWILIO ARCHITECTURE
SAM KITAJIMA-KIMBREL |
api.twilio.com (PHP)
Twilio Voice

GROWTH OVER TIME
SAM KITAJIMA-KIMBREL |
api.twilio.com (PHP)
Twilio Voice
SMS

SAM KITAJIMA-KIMBREL |
COMMON IMPLEMENTATION

SAM KITAJIMA-KIMBREL |
COMMON
AUTH
VALIDATION
FORMATTING
DATA MODEL

SAM KITAJIMA-KIMBREL |
COMMON
WORKER POOL
REQUEST QUEUE

SYNCHRONOUS I/O
SAM KITAJIMA-KIMBREL |
Fixed-size pool of workers
1 N
... ...
Request
Queue

SYNCHRONOUS I/O
SAM KITAJIMA-KIMBREL |
1 N
... ...

SYNCHRONOUS I/O
SAM KITAJIMA-KIMBREL |
1 N
... ...
BLOCKE
D

SAM KITAJIMA-KIMBREL |
api.twilio.com (PHP)
Twilio Voice
SMS ...

SAM KITAJIMA-KIMBREL |
KEEP
CODE REUSE
RAPID DEVELOPMENT

SAM KITAJIMA-KIMBREL |
FIX
RESOURCE UTILIZATION
FAULT ISOLATION

SAM KITAJIMA-KIMBREL |
SERVICE DECOMPOSITION

SERVICES, SERVICES EVERYWHERE
SAM KITAJIMA-KIMBREL |
Retrieve SMSLive Calls
Completed
Calls
Send SMS
...Numbers TaskRouter Lookups

WOULDN’T IT BE NICE IF…
SAM KITAJIMA-KIMBREL |
Retrieve SMSLive Calls Completed
Calls
Send SMS
...Numbers TaskRouter Lookups
api.twilio.com
🤔

SAM KITAJIMA-KIMBREL |
STARSHIP: API FEDERATION
(THE NEXT GENERATION)

API FEDERATION
SAM KITAJIMA-KIMBREL |
Retrieve SMSLive Calls
Completed
Calls
Send SMS
...Numbers TaskRouter Lookups
Starship — HTTP only!

API FEDERATION IN DETAIL
SAM KITAJIMA-KIMBREL |
smssend
Auth
Starship
Auth
Rate limit
Validate
Transform
Dispatch
Transform
Serialize

SAM KITAJIMA-KIMBREL |
SINGLE
IMPLEMENTATION

SAM KITAJIMA-KIMBREL |
MONITORING
METRICS
MANAGEMENT

SAM KITAJIMA-KIMBREL |
FLEXIBILITY AND SPEED

SAM KITAJIMA-KIMBREL |
UNIFIED WORKLOAD
+
ASYNC I/O

SYNCHRONOUS I/O
SAM KITAJIMA-KIMBREL |
Lightweight callback stack
...
... ...
Request
Queue
... ...
⏰

API FEDERATION
SAM KITAJIMA-KIMBREL |
Retrieve SMSLive Calls
Completed
Calls
Send SMS
...Numbers TaskRouter Lookups
Starship

Call control is being reinvented in several exciting new ways. In this talk, we explore existing models for building voice applications using the Asterisk Dialplan, Asterisk AGI/AMI, and how new in-cloud voice APIs are reinventing the way that build, host, and scale voice applications. such as in-cloud dialplan API with Twilio. Taking a programmer's perspective, we highlight desirable dialplan properties such as simplicity, automatic scalability, integration with existing databases and servers, and separation of business logic from telephony logic. We also explore the tradeoffs that Twilio has made to simplify the experience of building voice applications, including the concept of encapsulating the state of a voice call in a URL. We conclude with thoughts about how Asterisk could be streamlined for in-cloud dialplan APIs and the services that support them.

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Twilio Signal 2016 API Architecture

1. a REARCHITECTING THE TWILIO API FOR SCALE SAM KITAJIMA-KIMBREL |

2. SAM KITAJIMA-KIMBREL | EVERY COMMUNICATION COUNTS

3. SAM KITAJIMA-KIMBREL | I’M SAM. I WORKED ON THIS.

4. SAM KITAJIMA-KIMBREL | WHAT EVEN IS AVAILABILITY?

5. SAM KITAJIMA-KIMBREL | api.twilio.com …Calls Messages Numbers

6. SAM KITAJIMA-KIMBREL | api.twilio.com 😄 …Calls Messages Numbers

7. SAM KITAJIMA-KIMBREL | api.twilio.com 😭 …Calls Messages Numbers ❌ 💥

8. SAM KITAJIMA-KIMBREL | api.twilio.com 😭 …Calls Messages Numbers ❌ 💥 😄 ✅

9. REST API: 2013 SAM KITAJIMA-KIMBREL | 99.5% AVAILABLE 1000 RPS

10. REST API: TODAY SAM KITAJIMA-KIMBREL | 99.9994% AVAILABLE 5000 RPS

11. SAM KITAJIMA-KIMBREL | TWILIO API: PAST AND PRESENT

12. SAM KITAJIMA-KIMBREL | LONG LONG AGO…

13. ORIGINAL TWILIO ARCHITECTURE SAM KITAJIMA-KIMBREL | api.twilio.com (PHP) Twilio Voice

14. GROWTH OVER TIME SAM KITAJIMA-KIMBREL | api.twilio.com (PHP) Twilio Voice SMS

15. GROWTH OVER TIME SAM KITAJIMA-KIMBREL | api.twilio.com (PHP) Twilio Voice SMS ...

16. SAM KITAJIMA-KIMBREL | GOOD

17. SAM KITAJIMA-KIMBREL | COMMON IMPLEMENTATION

18. SAM KITAJIMA-KIMBREL | COMMON AUTH VALIDATION FORMATTING DATA MODEL

19. SAM KITAJIMA-KIMBREL | NOT SO GOOD

20. SAM KITAJIMA-KIMBREL | VARIED WORKLOAD

21. SAM KITAJIMA-KIMBREL | VARIED WORKLOAD

22. SAM KITAJIMA-KIMBREL | COMMON WORKER POOL REQUEST QUEUE

23. SAM KITAJIMA-KIMBREL | SYNCHRONOUS I/O

24. SYNCHRONOUS I/O SAM KITAJIMA-KIMBREL | Fixed-size pool of workers 1 N ... ... Request Queue

25. SYNCHRONOUS I/O SAM KITAJIMA-KIMBREL | 1 N ... ...

26. SYNCHRONOUS I/O SAM KITAJIMA-KIMBREL | 1 N ... ... BLOCKE D

27. SAM KITAJIMA-KIMBREL |

28. SAM KITAJIMA-KIMBREL | api.twilio.com (PHP) Twilio Voice SMS ...

29. SAM KITAJIMA-KIMBREL | api.twilio.com (PHP) Twilio Voice SMS ... ☠

30. SAM KITAJIMA-KIMBREL | api.twilio.com (PHP) Twilio Voice SMS ... ☠ ⏲

31. SAM KITAJIMA-KIMBREL | api.twilio.com (PHP) Twilio Voice SMS ... ☠ ⏲⏲⏲⏲⏲⏲⏲⏲⏲⏲⏲

32. SAM KITAJIMA-KIMBREL | api.twilio.com (PHP) Twilio Voice SMS ... ☠ ⏲⏲⏲⏲⏲⏲⏲⏲⏲⏲⏲ ❌

33. SAM KITAJIMA-KIMBREL | api.twilio.com 😭 …Calls Messages Numbers ❌ 💥 😄 ✅

34. SAM KITAJIMA-KIMBREL | api.twilio.com 😡 …Calls Messages Numbers 😡 😡 😡😡😡😡 ❌

35. SAM KITAJIMA-KIMBREL |

36. SAM KITAJIMA-KIMBREL | KEEP CODE REUSE RAPID DEVELOPMENT

37. SAM KITAJIMA-KIMBREL | FIX RESOURCE UTILIZATION FAULT ISOLATION

38. SAM KITAJIMA-KIMBREL | SERVICE DECOMPOSITION

39. SERVICES, SERVICES EVERYWHERE SAM KITAJIMA-KIMBREL | Retrieve SMSLive Calls Completed Calls Send SMS ...Numbers TaskRouter Lookups

40. WOULDN’T IT BE NICE IF… SAM KITAJIMA-KIMBREL | Retrieve SMSLive Calls Completed Calls Send SMS ...Numbers TaskRouter Lookups api.twilio.com 🤔

41. SAM KITAJIMA-KIMBREL | STARSHIP: API FEDERATION (THE NEXT GENERATION)

42. API FEDERATION SAM KITAJIMA-KIMBREL | Retrieve SMSLive Calls Completed Calls Send SMS ...Numbers TaskRouter Lookups Starship — HTTP only!

43. API FEDERATION IN DETAIL SAM KITAJIMA-KIMBREL | smssend Auth Starship Auth Rate limit Validate Transform Dispatch Transform Serialize

44. SAM KITAJIMA-KIMBREL | SINGLE IMPLEMENTATION

45. SAM KITAJIMA-KIMBREL | MONITORING METRICS MANAGEMENT

46. SAM KITAJIMA-KIMBREL |

47. SAM KITAJIMA-KIMBREL |

48. SAM KITAJIMA-KIMBREL | FLEXIBILITY AND SPEED

49. SAM KITAJIMA-KIMBREL | UNIFIED WORKLOAD + ASYNC I/O

50. SYNCHRONOUS I/O SAM KITAJIMA-KIMBREL | Lightweight callback stack ... ... ... Request Queue ... ... ⏰

51. API FEDERATION SAM KITAJIMA-KIMBREL | Retrieve SMSLive Calls Completed Calls Send SMS ...Numbers TaskRouter Lookups Starship

52. API FEDERATION SAM KITAJIMA-KIMBREL | Retrieve SMSLive Calls Completed Calls Send SMS ...Numbers TaskRouter Lookups Starship ⚠

53. API FEDERATION SAM KITAJIMA-KIMBREL | Retrieve SMSLive Calls Completed Calls Send SMS ...Numbers TaskRouter Lookups Starship ⚠✅ ✅ ✅ ✅ ✅ ✅ ✅

54. SAM KITAJIMA-KIMBREL | api.twilio.com 😄 …Calls Messages Numbers 😄 😄 😄😄😄😄

55. SAM KITAJIMA-KIMBREL |

Twilio Signal 2016 API Architecture

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