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Creating a microservice for the 1st time with go

Creating a microservice for the 1st time with go

Henrique Vicente

May 08, 2015

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  1. Creating a microservice
    for the 1st time with go
    Henrique Vicente

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  2. Go is an open source programming language that makes it
    easy to build simple, reliable, and efficient software.
    Robert Griesemer, Rob Pike and
    Ken Thompson started sketching
    the goals for a new language on
    the white board on September 21,

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  3. Go is a programming language
    designed by Google to help solve
    Google's problems, and Google
    has big problems.

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  5. An attempt to combine the
    ease of programming of an
    interpreted, dynamically
    typed language with the
    efficiency and safety of a
    statically typed, compiled

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  6. Influenced by
    • C family (basic syntax)
    • Pascal / Modula / Oberon family (declarations,
    • Newsqueak, Limbo (concurrency)
    • Unix

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  7. Design
    • Multi-value returns
    • No exception handling. Pleasant error handling.

    • Gourotines instead of threads
    • Object-oriented? Yes and no.

    No type hierarchy. Interfaces.
    • No pointer arithmetic for safety:

    no memory illegal address risk
    • Garbage collected

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  10. Quality tools
    • go fmt
    • go lint
    • go vet
    • go test
    • go tool cover

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  11. go get github.com/henvic/picel
    • Programming time?

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  13. • Package main: executable program
    • Others: shared libraries
    • Imports:

    - don’t use relative internally

    - use the path to where the repo is published
    • Subpackages = subdirectories

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  16. No official package
    • The designers of the language decided not to
    do it for a reason.
    • But what if you want to guarantee a specific
    package version?


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  17. many alternatives
    • godeps
    • gpm: https://github.com/pote/gpm

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  18. Building
    • go build
    • You get a single binary by default.
    • gox tool to build to multiple platforms easily

    or just use https://gobuilder.me/

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  19. The go way
    • Unused variable?
    • Unused import?
    • Unused?

    = No compiling :( … :)
    • Just discovered: fix it automagically :)


    Productivity += 1000
    • godoc -http=:6000 to see the docs on your computer or use

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  23. $GOPATH
    • Go likes to have all your src, pkg, bin inside a
    • But don’t worry. This doesn’t matter for end users
    of your application, given you’re release
    compiled binaries.

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  25. Useful packages, methods
    • fmt.Println(“like console.log”)
    • fmt.Sprintf(“%+v is %v old”, person,
    • flag: ./cmd -backend “https://google.com/”

    Flag: backend, value: https://google.com/
    • number, err := strcov.Atoi(“2442”)

    number is 2442 (int), err is nil

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  26. OOP: image.Name()

    with multiple return params
    Code: https://goo.gl/Ma2ITn

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  28. “Dockerifying
    • Docker is built in go
    • We’ve a microservice that is designed to work
    with default options
    • Why not build a docker container for it?

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  29. Dockerfile
    FROM golang:onbuild
    MAINTAINER Henrique Vicente
    RUN apt-get update
    RUN apt-get install -y \
    imagemagick \
    EXPOSE 8123

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  30. Docker Hub Registry
    • Add repo for automatic building on Docker Hub
    Registry to have your package certified
    • You can install with

    docker pull henvic/picel
    • See also Dockerfile.dev

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  31. Some nice go projects

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  32. Questions?

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