Twilio Signal 2016 API Architecture

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

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Twilio Signal 2016 Bots

How to use Twilio to reach a global audience via SMS The most common issues when sending SMS globally The cause of these issues How we can detect these issues What Twilio does to correct these issues What you can do to ensure your messages get through Learn more about best practices for building an SMS app here: https://www.twilio.com/learn/messaging/checklist-for-mobile-messaging-framework

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