Advanced Dependency Management in Go using Fx

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Advanced Dependency Management in Go using Fx Preslav Mihaylov

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Software Engineer @ Uber Tech. Trainer & Speaker ✍ Blogging at pmihaylov.com ‍ Open-sourcing at github.com/preslavmihaylov

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3 Advanced Dependency Management in Go using Fx Preslav Mihaylov 00/00/2020 Here’s what’s coming... Managing Component Dependencies via Manual Wiring Using Dependency Injection and Fx Framework Structuring code into reusable Fx modules

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Managing Component Dependencies via Manual Wiring

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5 Advanced Dependency Management in Go using Fx Preslav Mihaylov 00/00/2020 Manual Wiring == Manually Injecting Dependencies

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6 Advanced Dependency Management in Go using Fx Preslav Mihaylov 00/00/2020 An Example Hello World Web Application DEMO

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7 Advanced Dependency Management in Go using Fx Preslav Mihaylov 00/00/2020 Manual Wiring - Pros & Cons Code is easy to understand No magic behind the scenes Hard to maintain for large projects Every project has to deal with the “things every service needs”

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Using Dependency Injection and Fx Framework

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9 Advanced Dependency Management in Go using Fx Preslav Mihaylov 00/00/2020 Fx == Dependency Injection App Framework

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10 Advanced Dependency Management in Go using Fx Preslav Mihaylov 00/00/2020 Fx == DI Application Framework DI Framework? Component wiring is done automatically for you App Framework? The entire app lifecycle is managed rather than it being a plug-n-use library

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11 Advanced Dependency Management in Go using Fx Preslav Mihaylov 00/00/2020 So, what does it do?

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12 Advanced Dependency Management in Go using Fx Preslav Mihaylov 00/00/2020 At its core, it simply manages providers and receivers

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13 Advanced Dependency Management in Go using Fx Preslav Mihaylov 00/00/2020 Providers say “Here’s an instance of this component. Use it as you please…”

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14 Advanced Dependency Management in Go using Fx Preslav Mihaylov 00/00/2020 Receivers say “I need an instance of components X, Y, Z. Please provide them to me…”

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15 Advanced Dependency Management in Go using Fx Preslav Mihaylov 00/00/2020 What Fx does is to connect providers to receivers

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16 Advanced Dependency Management in Go using Fx Preslav Mihaylov 00/00/2020 Refactoring our Web App DEMO

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17 Advanced Dependency Management in Go using Fx Preslav Mihaylov 00/00/2020 Using a DI Framework - Pros & Cons Component Wiring is MUCH easier Less code => Less work Enables reusable modules Project onboarding is tougher Harder to debug & trace apps

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Structuring Your Code Into Reusable Fx Modules

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19 Advanced Dependency Management in Go using Fx Preslav Mihaylov 00/00/2020 Fx Modules allow you to extract code into separate independent layers/packages

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20 Advanced Dependency Management in Go using Fx Preslav Mihaylov 00/00/2020 However, they are especially useful in a microservice environment

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21 Advanced Dependency Management in Go using Fx Preslav Mihaylov 00/00/2020 All services need some baseline infra health checks, logging, tracing, metrics, conﬁgs...

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22 Advanced Dependency Management in Go using Fx Preslav Mihaylov 00/00/2020 Accounting Tax Calculations Trip Dispatcher Infrastructure Module Infrastructure Module Infrastructure Module

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23 Advanced Dependency Management in Go using Fx Preslav Mihaylov 00/00/2020 Modularizing our Web App DEMO

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Conclusion

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25 Advanced Dependency Management in Go using Fx Preslav Mihaylov 00/00/2020 Manual wiring works well for small to medium-size apps

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26 Advanced Dependency Management in Go using Fx Preslav Mihaylov 00/00/2020 A Dependency Injection Framework (Fx) allows your servicce to scale \w more components

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27 Advanced Dependency Management in Go using Fx Preslav Mihaylov 00/00/2020 Modularizing your Application enables your services to reuse common dependencies you to create boundaries across your application

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28 Advanced Dependency Management in Go using Fx Preslav Mihaylov 00/00/2020 Wanna go the extra mile? Practice setting up & using Fx here and here See how it’s done in Java by Google

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29 Talk’s name - Speaker 00/00/2020 Powered by Preslav Mihaylov preslav@pmihaylov.com