Методические материалы Лохтурова Вячеслава

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====== Язык программирования Golang ======

  * [[http://golang-book.ru/|Введение в программирование на Go]]
  * [[https://www.digitalocean.com/community/tutorials/how-to-build-and-install-go-programs|How To Build and Install Go Programs]]
  * [[https://www.systutorials.com/how-to-get-the-hostname-of-the-node-in-go/|How to get the hostname of the node in Go?]]

  * [[https://min.io/docs/minio/linux/developers/go/minio-go.html|MinIO Go Client SDK for Amazon S3 Compatible Cloud Storage]]

<code>
student@client1:~$ sudo apt install golang-go
</code>
===== Web приложение =====
<code>
student@client1:~$ mkdir gowebd

student@client1:~$ cd gowebd/

student@client1:~/gowebd$ cat main.go
</code><code>
package main

import (
        "fmt"
        "log"
        "net/http"
        "os"
)

const ver = "ver1.1"

func main() {
        http.HandleFunc("/", HelloServer)
        fmt.Printf("Starting server at port 80\n")
        if err := http.ListenAndServe(":80", nil); err != nil {
                log.Fatal(err)
        }
}

func HelloServer(w http.ResponseWriter, r *http.Request) {
        hostname, err := os.Hostname()
        if err != nil {
                panic(err)
        }
        fmt.Fprint(w, "Hello world from gowebd on " + hostname + " " + ver + "\n")
//        variable := os.Getenv("VARIABLE")
//        fmt.Fprint(w, "Variable is " + variable + " from gowebd on " + hostname + " " + ver + "\n")
}
</code><code>
student@client1:~/gowebd$ sudo go run main.go

student@client1:~/gowebd$ go mod init gowebd

student@client1:~/gowebd$ sudo go build -o /usr/local/sbin/gowebd

student@client1:~/gowebd$ sudo /usr/local/sbin/gowebd
</code>
===== golangci-lint =====

  * [[https://golangci-lint.run/welcome/quick-start/|golangci-lint.run quick-start]]
  * [[https://blog.ildarkarymov.ru/posts/linters/|golangci-lint и внедрение его в большой проект]]

<code>
$ go mod init gowebd
  или
$ cat go.mod
</code><code>
module gowebd

go 1.19
</code><code>
~/gowebd# time docker run --rm -v $(pwd):/app -w /app golangci/golangci-lint:v1.62.2 golangci-lint run --timeout=10m

main.go:11:7: const `ver2` is unused (unused)
const ver2 = "ver1.3"
      ^
real    1m28.670s
</code>

Методические материалы Лохтурова Вячеслава

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