WORKSHOP: from Zero to a Network Application with #golang

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2 WORKSHOP: from Zero to a Network Application with #golang Patrick Riel, priel@cisco.com Stève Sfartz, stsfartz@cisco.com

3 Cisco Spark How Questions? Use Cisco Spark to communicate with the speaker after the session 1. Find this session in the Cisco Live Mobile App 2. Click Join the Discussion 3. Install Spark or go directly to the space 4. Enter messages/questions in the space cs.co/ciscolivebot# 2018 Cisco and/or its affiliates. All rights reserved. Cisco Public

4 from Zero to a Network Application with GoLang DevNet Workshop Intro to #golang Setting up your dev env Building a Web API Dockerize

5 Why Go? Released by Google in 2009 conceived in 2007, popular since 2015 Designed to address software engineering issues faced in the construction of large server software Influenced by: C, Python, Smalltalk, Alef, CSP, Modula, Pascal, Limbo, BCPL Focus on clarity, simplicity and composability resulted in a productive, fun, expressive and powerful language No class inheritance but Embedding & Interfaces to provide polymorphism Built-in concurrency (parallelism & asynchrony) via Channels & goroutines Includes a - debugging, profiling, formatting and testing - toolset 2018 Cisco and/or its affiliates. All rights reserved. Cisco Public 5

6 Software engineering guided the design of Go Clear dependencies Clear syntax Clear semantics Composition over inheritance Simplicity provided by the programming model (garbage collection, concurrency) Easy tooling (the go tool, gofmt, godoc, gofix) TRY IT: play.golang.org, tour.golang.org 2018 Cisco and/or its affiliates. All rights reserved. Cisco Public 6

7 Functions: mutiple & named results Cisco and/or its affiliates. All rights reserved. Cisco Public 7

8 Hands-on with the Go Tour

9 Setting up your dev env

10 Installing Go Download the PKG on Mac (or MSI for Windows) Launch installer by default installs in /usr/local/go (or c:\go for Windows). set the GOROOT environment variable if you install to a different location Adds the Go binary to your PATH environment variable type go version to check your installation is successful Create a Go workspace directory under $HOME/go on Mac (or %USERPROFILE%\go for Windows) set a GOPATH environment variable if elsewhere 2018 Cisco and/or its affiliates. All rights reserved. Cisco Public 10

11 Hands-on from the terminal

12 From a terminal (if you are NOT on a provided laptop) fork repo: clone in $HOME/go by default, or whatever your GOPATH is > cd $GOPATH/src/github.com > git clone > cd ObjetIsAdvantag > cd 1-helloworld-reversed > go run main.go > go build main.go >./main 2018 Cisco and/or its affiliates. All rights reserved. Cisco Public 12

13 From a terminal (if you ARE at a provided laptop) > cd $HOME/workspace/go/src/github.com > cd ObjectIsAdvantag/ > cd 1-helloworld-reversed # Run a go program > go run main.go # Compile a go program > go build main.go >./main 2018 Cisco and/or its affiliates. All rights reserved. Cisco Public 13

14 Go Extension for Visual Studio Code Installs automatically at launch or manually via go get v: github.com/nsf/gocode github.com/uudashr/gopkgs/cmd/gopkgs github.com/ramya-rao-a/go-outline github.com/acroca/go-symbols golang.org/x/tools/cmd/guru golang.org/x/tools/cmd/gorename github.com/fatih/gomodifytags github.com/haya14busa/goplay/cmd/goplay github.com/josharian/impl github.com/rogpeppe/godef golang.org/x/tools/cmd/godoc sourcegraph.com/sqs/goreturns github.com/golang/lint/golint github.com/cweill/gotests github.com/derekparker/delve/cmd/dlv golang.org/x/tools/cmd/guru 2018 Cisco and/or its affiliates. All rights reserved. Cisco Public 14

15 VS Code golang extension: Installation Tips If any go tools dependency is missing, install it manually Make sure the $GOPATH/bin directory appears in your path If having issues with the debugger lldb-server not found, type xcode-select install 2018 Cisco and/or its affiliates. All rights reserved. Cisco Public 15

16 Hands-on from VS Code

17 Hands on from VSCode Debugging From the terminal, enter the samples folder and type > code Cisco and/or its affiliates. All rights reserved. Cisco Public 17

18 Hands on from VSCode Debugging From the terminal, enter the samples folder and type > code. In VS Code, select file 1-helloworld-reversed/main.go Add a breakpoint and run the debugger with F Cisco and/or its affiliates. All rights reserved. Cisco Public 18

19 Hands on from VSCode Integrated terminal Now, change directory to 2-readword and go run main.go CHANGE SNAPSHOT 2018 Cisco and/or its affiliates. All rights reserved. Cisco Public 19

20 Web API hands on

21 Hands-on instructions mkdir p $GOPATH/src/github.com/ObjectIsAdvantag cd $GOPATH/src/github.com/ObjectIsAdvantag git clone cd $GOPATH/src/github.com/ObjectIsAdvantag/CLEUR-1814/5-webserver chmod u+x install.sh./install.sh gin -a t "../" -d microservice/ microservice/main.go 2018 Cisco and/or its affiliates. All rights reserved. Cisco Public 21

22 Development Architecture CLEUR 2018 Content Catalog HTTP request Gin proxy Web App /catalog?search= port 3000 port Cisco and/or its affiliates. All rights reserved. Cisco Public 22

23 Gin a simple command line utility for live-reloading Go web applications gin will automatically recompile your code when it detects a change your app will be restarted the next time it receives an HTTP request 2018 Cisco and/or its affiliates. All rights reserved. Cisco Public 23

24 HTTP Router lightweight high performance HTTP request router (multiplexer) 2018 Cisco and/or its affiliates. All rights reserved. Cisco Public 24

25 Dockerize

26 Hands-on instructions change the HOST and HOST_PORT env variables./compile-docker.sh./run-docker.sh docker ps curl -v "localhost:8888/catalog?search=golang" jq 2018 Cisco and/or its affiliates. All rights reserved. Cisco Public 26

27 Cisco Spark How Questions? Use Cisco Spark to communicate with the speaker after the session 1. Find this session in the Cisco Live Mobile App 2. Click Join the Discussion 3. Install Spark or go directly to the space 4. Enter messages/questions in the space cs.co/ciscolivebot# 2018 Cisco and/or its affiliates. All rights reserved. Cisco Public

28 Please complete your Online Session Evaluations after each session Complete 4 Session Evaluations & the Overall Conference Evaluation (available from Thursday) to receive your Cisco Live T-shirt All surveys can be completed via the Cisco Live Mobile App or the Communication Stations Complete Your Online Session Evaluation Don t forget: Cisco Live sessions will be available for viewing on-demand after the event at Cisco and/or its affiliates. All rights reserved. Cisco Public

29 Continue Your Education Demos in the Cisco campus Walk-in Self-Paced Labs Tech Circle Meet the Engineer 1:1 meetings Related sessions 2018 Cisco and/or its affiliates. All rights reserved. Cisco Public 29

30 Thank you

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