Scalability and Hardware at Nomanini

Scaling TDD, CI and CD for Hardware, Firmware and Software, presented at Scaleconf 2013

Transcript

1. © Nomanini, 2013
   Scalability and Hardware
   

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2. © Nomanini, 2013
   @dalehumby
   nomanini.com
   

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3. © Nomanini, 2013
   million
   700 pa
   85
   $ bn
   60
   $
   Mobile subscribers
   in Africa
   Ave spend by
   mobile subscribers
   Total market
   Source: Pyramid Forecast for AME, McKinsey Global Institute, Lions on the move, Jan 2010
   

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4. © Nomanini, 2013
   Fast
   Transactions
   Easy to use
   Trusted
   method
   • Fast printing
   • Trusted proof of
   transaction
   • Reliable
   • Simple interface
   1
   2
   3
   Scratch
   cards
   Nomanini
   terminal
   

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5. © Nomanini, 2013
   

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6. © Nomanini, 2013
   Pick n
   Pay
   MTN
   Vodacom
   Server on
   GAE
   Cash
   Airtime
   Credit
   Redemption
   Printed
   voucher
   Seller Mobile
   subscriber
   Cash
   

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7. © Nomanini, 2013
   

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8. © Nomanini, 2013
   

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9. © Nomanini, 2013
   Please add a Lock button
   

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10. © Nomanini, 2013
    

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11. © Nomanini, 2013
    Planned Dev Test Demo UAT Package Released
    Ready Monitor
    

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12. © Nomanini, 2013
    

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13. © Nomanini, 2013
    Cross-functional people
    

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14. © Nomanini, 2013
    

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15. © Nomanini, 2013
    

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16. © Nomanini, 2013
    

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17. © Nomanini, 2013
    

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18. © Nomanini, 2013
    8-bit CPU
    16 kB Flash
    2 kB RAM
    

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19. © Nomanini, 2013
    Keyboard
    LED
    Driver
    State
    Machine
    Logic
    Hardware
    Vd
    d
    

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20. © Nomanini, 2013
    Keyboard
    LED
    Driver RAM
    State
    Machine
    Logic
    Proxy
    for
    hardware
    

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21. © Nomanini, 2013
    KeyBoard
    Helper
    LED
    Helper
    Driver
    Mocks RAM
    State
    Machine
    Logic
    Proxy
    for
    hardware
    

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22. © Nomanini, 2013
    bool TestStateManager_LockLEDOnWhenLockPressed(void)
    {
    // GIVEN Lock LED is off
    LED_TurnLockLEDOff();
    // WHEN Lock button is pressed
    KeyBoardHelper_PressLockButton();
    // AND scan keyboard
    StateMachine_Update();
    // THEN Lock LED should be on
    ASSERT_TRUE_MESSAGE(LED_IsRedLockLEDOn(),
    “Red Lock LED should be on”);
    }
    

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23. © Nomanini, 2013
    KeyBoard
    Helper
    LED
    Helper
    Driver
    Mocks RAM
    FALSE
    State
    Machine
    Logic Test
    // GIVEN Lock LED is off
    LED_TurnLockLEDOff();
    

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24. © Nomanini, 2013
    KeyBoard
    Helper
    LED
    Helper
    RAM
    TRUE
    FALSE
    State
    Machine
    Logic Test
    Press
    button
    // WHEN Lock button is pressed
    KeyBoardHelper_PressLockButton();
    Driver
    Mocks
    

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25. © Nomanini, 2013
    KeyBoard
    Helper
    LED
    Helper
    RAM
    TRUE
    TRUE
    State
    Machine
    Logic Test
    Press
    button
    Update
    // AND scan keyboard
    StateMachine_Update();
    Driver
    Mocks
    

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26. © Nomanini, 2013
    KeyBoard
    Helper
    LED
    Helper
    RAM
    TRUE
    TRUE
    State
    Machine
    Logic Test
    Press
    button
    Update
    Assert
    // THEN Lock LED should be on
    ASSERT_TRUE_MESSAGE(LED_IsRedLockLEDOn(),
    “Red Lock LED should be on”);
    Driver
    Mocks
    

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27. © Nomanini, 2013
    

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28. © Nomanini, 2013
    Running All Tests...
    Hardware Rev 6, rel 2
    Firmware 2623-0d8ab4be2f02
    Running Test Fixture: State Manager Tests (Part A)
    ---------------------
    TestStateManager_ButtonPressTimesOut:PASS
    TestStateManager_LockLEDOnWhenLockPressed:PASS
    ...
    TestStateManager_StaysLockedWhileCharging:FAIL
    11 Tests 1 Failures 1 Ignored
    Test Run FAILED. 10/11 tests passed.
    Terminal output
    

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29. © Nomanini, 2013
    Jenkins CI
    

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30. © Nomanini, 2013
    Started by upstream project "Slave-Build" build #361
    run_functional_tests.py -c ci.ini
    tests(INFO): TEST_BLOCK_1.s19 ... ok
    tests(INFO): TEST_BLOCK_2.s19 ... ok
    tests(INFO): TEST_BLOCK_3.s19 ... ok
    tests(INFO): TEST_BLOCK_4.s19 ... ok
    tests(INFO): TEST_BLOCK_5.s19 ... ok
    ...
    tests(INFO): TEST_BLOCK_23.s19 ... ok
    tests(INFO): Test run passed
    Triggering a new build of Upload_to_FTP_for_CI #245
    Notifying upstream projects of job completion
    Finished: SUCCESS
    Console Output
    

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31. © Nomanini, 2013
    

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32. © Nomanini, 2013
    Done
    is
    used by customers
    

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33. © Nomanini, 2013
    

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34. © Nomanini, 2013
    

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35. © Nomanini, 2013
    Feature flags
    

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36. © Nomanini, 2013
    

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37. © Nomanini, 2013
    Monitoring
    

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38. © Nomanini, 2013
    

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39. © Nomanini, 2013
    Measure everything
    Find the bottlenecks
    Fix them methodically
    Start today
    

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40. © Nomanini, 2013
    Dale Humby
    dale@nomanini.com
    @dalehumby
    

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