uUsing Node.js, PouchDB and Replicated Transaction Documents

1. HI!

2. WHO AM I?
▸Pedro Teixeira
▸@pgte
▸Partner and Chief Futurist @ YLD
▸Node.js Developer
▸Offline-first enthusiast

5. HOW TO BUILD A
RELIABLE CHECKOUT
EXPERIENCE

6. …USING NODE.JS,
POUCHDB AND
REPLICATED TRANSACTION
DOCUMENTS

7. E-COMMERCE

8. THE
CHECKOUT
EXPERIENCE

9. IS A JOURNEY THAT BEGINS
WITH THE OPTIMISTIC
CHECKOUT BUTTON

10. BUT ONLY REALLY
BEGINS WITH THE
CONFIRMATION BUTTON

11. BEHIND THE
SCENES…

12. WHICH
EVENTUALLY END
IN SUCCESS

13. AND A
CONFIRMATION
E-MAIL

14. WHAT
CAN GO
WRONG?

15. DUPLICATE
TRANSACTIONS

16. UNDEFINED
STATE

17. CLIENT
CRASHES

18. LET’S TALK
ABOUT
MOBILE

20. https://youtu.be/aqvz5Oqs238
(LAST SLIDE TAKEN FROM
ILYA GRIGORIK’S GOOGLE
IO TALK)

21. MAIN TAKEAWAY IS
DEVELOPING RELIABLE
MOBILE APPS IS
PARTICULARLY DIFFICULT

22. LET’S GRADE
HOW APPS DEAL WITH
NETWORKING FAILURES

23. E
NO ERROR
HANDLING

24. D
CUSTOMER IS NOTIFIED
OF THE ERROR

25. C
CUSTOMER CAN RECOVER
FROM ERROR

26. B
APP CAN RECOVER FROM
SOME SYSTEM ERRORS

27. A
APP CAN RECOVER FROM SOME
SYSTEM AND USER ERRORS

28. LAST STAGE IS
PARTICULARLY
EXPENSIVE

29. WHY?

30. LET’S LOOK AT
SYSTEMS
ARCHITECTURE

35. TOO MUCH
RESPONSIBILITY

36. “WORKS ON MY LAPTOP”

37. BUT
WAIT…

38. ALL WE NEED IS
SYNC

44. ONE DATABASE
PER CUSTOMER

45. ONE DOCUMENT PER
TRANSACTION

46. SYNC PROTOCOL REPLICATES
TRANSACTION DOC
(BI-DIRECTIONAL)
= OFFLINE TOLERANCE

47. CLERK REACTS TO
TRANSACTION
STATE CHANGES

49. CLERK INJECTS
TRANSACTION STATE
CHANGES WHEN BACK-
END EVENT OCCURS

50. SHOW ME
THE CODE!

51. UI

52. POUCH-REDUX-MIDDLEWARE

54. BACK-END

55. POUCH-CLERK

56. CLERK
1. STATE TRANSITIONS
2. ASYNC UPDATERS

57. STATE
TRANSITIONS

59. ASYNC
UPDATERS

61. QUICK
DEMO

62. DEMO IS ALSO OPEN SOURCE
pgte/pouch-clerk-example-app

63. MORE
1. How to Build a Reliable Transaction Experience for your Customers (bl
post)
http://blog.yld.io/2016/06/24/how-to-build-a-reliable-transaction-
experience-for-your-customers
2. Delivering a better transaction experience by using Replicated
Transaction Documents (video)
https://www.youtube.com/watch?v=2yb0tn3Q3Mg

64. THANK
YOU!