Notes go golang

Voir :

https://www.redhat.com/sysadmin/learn-go-programming

https://awesome-go.com/go-generate-tools/

Voir aussi :

https://fr.wikipedia.org/wiki/Zig_(langage)

Le langage V

Notes rust lang

Tuto

Voir tuto Api :

https://www.youtube.com/watch?v=SonwZ6MF5BE

https://github.com/bradtraversy/go_restapi

Début du totu

package main import( // "encoding/json" "log" "net/http" // "math/rand" // "strconv" "github.com/gorilla/mux" ) type Book struct { ID string `json:"id"` Isbn string `json:"isbn"` Title string `json:"title"` Author *Author `json:"author"` } type Author struct { Firstname string `json:"fistname"` Lastname string `json:"lastname"` } func getBooks(w http.ResponseWriter, r *http.Request) { } func getBook(w http.ResponseWriter, r *http.Request) { } func createBook(w http.ResponseWriter, r *http.Request) { } func updateBook(w http.ResponseWriter, r *http.Request) { } func deleteBook(w http.ResponseWriter, r *http.Request) { } func main() { r := mux.NewRouter() r.HandleFunc("/api/books", getBooks).Methods("GET") r.HandleFunc("/api/books/{id}", getBook).Methods("GET") r.HandleFunc("/api/books", createBook).Methods("POST") r.HandleFunc("/api/books/{id}", updateBook).Methods("PUT") r.HandleFunc("/api/books/{id}", deleteBook).Methods("DELETE") log.Fatal(http.ListenAndServe(":8085", r)) }

Install & config

sudo apt-get install -t jessie-backports golang mkdir -p $HOME/go/bin #export GOPATH=$HOME/go # go install plop.go export GOBIN="$HOME/go/bin" export PATH="$PATH:~/.local/bin/" export GOHOME="$HOME/go" export GO111MODULE=on export PATH="$PATH:$HOME/go/bin/"

export GOPATH=$HOME/work
export GOBIN=$HOME/work/bin
export PATH=$PATH:$HOME/work/bin

Exemple avec Terraform

Voir aussi OpenTofu

go get -u github.com/hashicorp/terraform

Ce qui revient à :

mkdir -p ~/work/src/github.com/hashicorp/ cd ~/work/src/github.com/hashicorp/ git clone https://github.com/hashicorp/terraform

Puis

cd ~/work/src/github.com/hashicorp/terraform cat README.md make updatedeps make go install

Dev bonnes pratiques

https://go.dev/doc/gopath_code

Language

Types

Structhttps://www.golangprograms.com/how-to-print-struct-variables-data.html

Lancer des commandes systèmes

Pb voir : http://stackoverflow.com/questions/23723955/how-can-i-pass-a-slice-as-a-variadic-input

// http://www.darrencoxall.com/golang/executing-commands-in-go/ package main import ( "fmt" "os" "os/exec" "log" //"flag" //"strings" ) func main() { s := os.Args[1:] fmt.Println(s) //cmd := exec.Command(s[:]) // Error ! cmd := exec.Command(s[0], s[1], s[2]) //out, err := cmd.Output() // Whithout Stdout out, err := cmd.CombinedOutput() // Whith StdErr if err != nil { fmt.Println("Error") fmt.Printf("%s", out) log.Fatal(err) } fmt.Printf("%s", out) }
go run exec.go ls /tmp/ /

Tests unitaire

package main
func fact(x int) int {
if (x == 0) || (x == 1) {
return 1
}
return x * fact(x-1)
}

package main
import "testing"
func TestFact(t *testing.T) {
if fact(0) != 1 {
//t.Fail() // Erreur sans message
t.Error("Err with 0")
}
if fact(1) != 1 {
t.Error("Err with 1")
}
if fact(4) != 24 {
t.Error("Err with 4")
}
}

go test fact.go fact_test.go

ok command-line-arguments 0.001s

Outils

Gosh un shell interactif

IDE

Vscode / Codium

LiteIDE X

snap install liteide-tpaw

IntelliJ IDEA

Code qualité

Voir https://sparkbox.com/foundry/go_vet_gofmt_golint_to_code_check_in_Go

GolintGo fmtGo vet

Crosscompil

env GOOS=android GOARCH=arm64 go build -o /arm64bins/app

Pour voir la liste des architectures supportée

go tool dist list

Tour

export GO111MODULE=on export GOPATH=$HOME/code/go go install golang.org/x/website/tour@latest go get golang.org/x/website/tour@latest ~/code/go/bin/tour

ou : https://go.dev/tour/welcome/1

Debuger

Voir dlv :

https://developers.redhat.com/articles/2023/04/24/how-debug-openshift-operators-live-cluster-using-dlv

https://github.com/go-delve/delve/blob/master/Documentation/cli/getting_started.md

Jupyter Notebook

Voir : https://github.com/gopherdata/gophernotes#linux-or-freebsd

Ordiphone / Android / téléphone mobile

Voir :

https://github.com/golang/go/wiki/Mobile

https://betterprogramming.pub/build-native-cross-platform-apps-with-go-70f9572baeb5

https://rogchap.com/2020/09/14/running-go-code-on-ios-and-android/

Voir GoMobile :

https://pkg.go.dev/golang.org/x/mobile/cmd/gomobile

Voir Gioui :

https://gioui.org/

https://www.gushiciku.cn/pl/pkdc

Voir Fyne :

https://fyne.io/

https://www.youtube.com/watch?v=S3T9l9QUa9I

go get fyne.io/fyne/cmd/fyne fyne package -os android -appID xyz.acme.plop

Tuto Fyne notes

https://www.youtube.com/watch?v=ZYtd6rjP0TM

https://github.com/fynelabs/notes

Voir aussihttps://www.youtube.com/watch?v=jbsYrrNiqAs