'Server-side on Swift' by Volodymyr Shevchenko

This talk was made for CocoaHeads Kyiv #13 which took place Dec 16 2017.

Transcript

1. Server-side on Swift
   by Volodymyr Shevchenko
   

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2. What for?
   - We will do mobile better
   - Can’t build App on our own
   - Backend is a black-box with API
   

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3. Why Swift?
   ??
   

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4. Why Swift?
   - we know Swift
   - we can reuse some code
   - Swift is faster
   

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5. Kitura Perfect Vapor Zewo
   What do we have:
   

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6. ⭐ GitHub Req/sec Looks Good?
   Kitura 6K
   2.1K No
   Perfect 12.3K 4.2K Yes
   Vapor 11.6K 3.2K Yes
   Zewo 1.7K 1.7K No
   Benchmarks of the Top
   Server-Side Swift frameworks
   

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7. Vapor
   Perfect
   

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8. Let’s build something
   

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9. Pet Store
   - Authorization
   - Domain CRUD
   - REST API
   

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10. Check Local
    Credentials
    Create new
    User
    Check FB
    Credentials
    Create Session
    Object
    Success?
    Facebook Database Cache
    Yes
    No
    ERROR response
    TOKEN response
    

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11. Success?
    Database
    Cache
    Yes
    Proceed with request
    401 response
    Fetch session
    from Cache
    Fetch session
    from DB
    Success?
    No No
    Yes
    

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12. User Pet
    Order
    Tag
    Category
    Domain relations
    *
    

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13. Our stack:
    - Perfect as a framework
    - Mongo DB as storage
    - StORM as ORM
    

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14. Few words from Cap…
    

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15. Leaks are evil
    

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17. Crashes are evil
    

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18. !
    Force unwrap is evil
    

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19. Cocoapods
    Carthage
    SPM
    

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20. XCode just an editor
    

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21. ≠
    

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22. - this won’t compile on Linux:
    - after fix:
    

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23. Foundation is NOT ported for
    100%
    https://github.com/apple/swift-corelibs-foundation/blob/master/Docs/Status.md
    …
    …
    

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24. ≠
    (curl + libssl)
    (curl + openssl)
    

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25. [“a”, “b”, ”c”] -> “a, b, c”
    Bugs in MongoDBStORM
    

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26. [“a”, “b”, ”c”] -> “a, b, c”
    - Work without ORM
    - Switch to an other DB
    - Switch to Vapor + Fluent
    - Fix bug
    

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27. Nested objects are
    MongoDBStORM
    not supported
    

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28. ¯\_(ツ)_/¯
    

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29. Lets Deploy
    

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30. Where?
    

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31. Where?
    - Amazon EC2
    - Microsoft Azure
    - Google Cloud
    - Digital Ocean
    - Linode
    - Alibaba cloud
    - IBM cloud
    - Packet
    - Vultr
    - …
    

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32. Where?
    - Amazon EC2
    - Microsoft Azure
    - Google Cloud
    - Digital Ocean
    - Linode
    - Alibaba cloud
    - IBM cloud
    - Packet
    - Vultr
    - …
    

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33. How to deploy?
    

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34. Perfect Assistant
    

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35. Perfect Assistant
    

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36. Docker
    

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37. Plain
    

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38. 2) Connect to remote
    machine via SSH
    3) Install all required
    tools and libs
    4) Setup Database
    server
    5) Clone sources from
    Git repo
    6) Compile
    7) Configure firewall to
    allow http(s) traffic
    8) Run executable
    1) Create remote
    virtual machine on
    selected provider
    Plain Deploy
    

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39. Performance
    - apib tool
    - Latency (MIN, MAX, AVG)
    - Requests/second
    

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40. Performance
    req/sec Lat, min Lat, max Lat, avg
    Healthcheck 26.8K 0.6 42 7.4
    Empty Auth 739 9 643 269
    Auth + Read 407 10.1 952 487
    Auth + Write 389 9.4 1028 511
    

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41. Scale
    - Vertical
    - Horizontal
    

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42. Database is Server
    Database Server
    API Server
    Network
    

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43. Scaled infrastructure
    Database Server
    API Server II
    API Server I
    API Server III
    Load Balancer
    

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44. 0
    500
    1000
    1500
    2000
    Empty Auth Auth + read Auth + write
    Requests per second
    

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45. 0
    150
    300
    450
    600
    Empty Auth Auth + read Auth + write
    Average latency, ms
    

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46. Cluster Performance
    req/sec Lat, min Lat, max Lat, avg
    Healthcheck 21.1K 1.4 1105 9.4
    Empty Auth 1820 4.7 473 109
    Auth + Read 897 3.1 243 55.6
    Auth + Write 916 13 617 217.5
    

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47. Questions?
    

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48. Thanks!
    

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