refactor: Fix deprecated io/ioutil (#243)

Afifurrohman · novalagung · web-flow · commit 31e5f795a545 · 2023-11-08T14:56:02.000+07:00
* refactor: Add warning when import using dot prefix

* refactor: Add `env`, `dotenv`, `tfvars`, `ini`, `hcl` to list support `viper` config type

* refactor: Fix deprecated `io/ioutil` change `ioutil.WriteFile` to `os.WriteFile`, `ioutil.ReadFile` to `os.ReadFile`, `ioutil.ReadAll` to `io.ReadAll`

* feat: update contributors

* refactor: sentences

---------

Co-authored-by: novalagung &lt;hello@novalagung.com&gt;
diff --git a/.gitignore b/.gitignore
@@ -92,3 +92,7 @@ typings/
 
 # Desktop Service Store
 .DS_Store
+
+# IDE
+.idea
+.vscode
diff --git a/content/A-concurrency-pipeline.md b/content/A-concurrency-pipeline.md
@@ -74,7 +74,6 @@ package main
 
 import (
     "fmt"
-    "io/ioutil"
     "log"
     "math/rand"
     "os"
@@ -128,7 +127,7 @@ func generateFiles() {
     for i := 0; i < totalFile; i++ {
         filename := filepath.Join(tempPath, fmt.Sprintf("file-%d.txt", i))
         content := randomString(contentLength)
-        err := ioutil.WriteFile(filename, []byte(content), os.ModePerm)
+        err := os.WriteFile(filename, []byte(content), os.ModePerm)
         if err != nil {
             log.Println("Error writing file", filename)
         }
@@ -164,7 +163,6 @@ package main
 import (
     "crypto/md5"
     "fmt"
-    "io/ioutil"
     "log"
     "os"
     "path/filepath"
@@ -209,7 +207,7 @@ func proceed() {
         counterTotal++
 
         // read file
-        buf, err := ioutil.ReadFile(path)
+        buf, err := os.ReadFile(path)
         if err != nil {
             return err
         }
@@ -241,7 +239,7 @@ Cukup panjang isi fungsi ini, tetapi isinya cukup *straightforward* kok.
 * Kedua, kita siapkan `counterRenamed` sebagai counter jumlah file yang berhasil di-rename. Untuk ini juga idealnya sama dengan nilai pada `counterTotal`, kecuali ada error
 * Kita gunakan `filepath.Walk` untuk melakukan pembacaan semua file yang ada dalam folder `$TEMP/chapter-A.59-pipeline-temp`.
 * File akan dibaca secara sekuensial, di tiap pembacaan jika ada error dan ditemukan sebuah direktori, maka kita ignore kemudian lanjut pembacaan file selanjutnya.
-* File dibaca menggunakan `ioutil.ReadFile()`, kemudian lewat fungsi `md5.Sum()` kita cari md5 hash sum dari konten file.
+* File dibaca menggunakan `os.ReadFile()`, kemudian lewat fungsi `md5.Sum()` kita cari md5 hash sum dari konten file.
 * Setelahnya, kita rename file dengan nama `file-<md5hash>.txt`.
 
 Semoga cukup jelas. Kalo iya, jalankan programnya.
@@ -274,7 +272,6 @@ package main
 import (
     "crypto/md5"
     "fmt"
-    "io/ioutil"
     "log"
     "os"
     "path/filepath"
@@ -329,7 +326,7 @@ func readFiles() <-chan FileInfo {
                 return nil
             }
 
-            buf, err := ioutil.ReadFile(path)
+            buf, err := os.ReadFile(path)
             if err != nil {
                 return err
             }
diff --git a/content/A-pipeline-context-cancellation.md b/content/A-pipeline-context-cancellation.md
@@ -26,7 +26,6 @@ package main
 
 import (
     "fmt"
-    "io/ioutil"
     "log"
     "math/rand"
     "os"
@@ -147,7 +146,7 @@ func createFiles(chanIn <-chan FileInfo, numberOfWorkers int) <-chan FileInfo {
                 for job := range chanIn {
                     filePath := filepath.Join(tempPath, job.FileName)
                     content := randomString(contentLength)
-                    err := ioutil.WriteFile(filePath, []byte(content), os.ModePerm)
+                    err := os.WriteFile(filePath, []byte(content), os.ModePerm)
 
                     log.Println("worker", workerIndex, "working on", job.FileName, "file generation")
 
@@ -381,7 +380,7 @@ func createFiles(ctx context.Context, chanIn <-chan FileInfo, numberOfWorkers in
                     default:
                         filePath := filepath.Join(tempPath, job.FileName)
                         content := randomString(contentLength)
-                        err := ioutil.WriteFile(filePath, []byte(content), os.ModePerm)
+                        err := os.WriteFile(filePath, []byte(content), os.ModePerm)
 
                         log.Println("worker", workerIndex, "working on", job.FileName, "file generation")
 
diff --git a/content/A-properti-public-dan-private.md b/content/A-properti-public-dan-private.md
@@ -201,10 +201,11 @@ Dari contoh program di atas, bisa disimpulkan bahwa untuk menggunakan `struct` y
 
 ## A.26.5. Import Dengan Prefix Tanda Titik
 
+> PERINGATAN! Penggunaan tanda titik pada saat import package bisa menyebabkan kode menjadi ambigu, karena alasan tersebut teknik import ini kurang direkomendasikan.
+
 Seperti yang kita tahu, untuk mengakses fungsi/struct/variabel yg berada di package lain, nama package nya perlu ditulis, contohnya seperti pada penggunaan `library.Student` dan `fmt.Println()`.
 
 Di Go, komponen yang berada di package lain yang di-import bisa dijadikan se-level dengan komponen package peng-import, caranya dengan menambahkan tanda titik (`.`) setelah penulisan keyword `import`. Maksud dari se-level di sini adalah, semua properti di package lain yg di-import bisa diakses tanpa perlu menuliskan nama package, seperti ketika mengakses sesuatu dari file yang sama.
-
 ```go
 import (
     . "belajar-golang-level-akses/library"
diff --git a/content/A-simplified-fan-in-fan-out-pipeline.md b/content/A-simplified-fan-in-fan-out-pipeline.md
@@ -27,7 +27,6 @@ package main
 
 import (
     "fmt"
-    "io/ioutil"
     "log"
     "math/rand"
     "os"
@@ -82,7 +81,7 @@ func generateFiles() {
     for i := 0; i < totalFile; i++ {
         filename := filepath.Join(tempPath, fmt.Sprintf("file-%d.txt", i))
         content := randomString(contentLength)
-        err := ioutil.WriteFile(filename, []byte(content), os.ModePerm)
+        err := os.WriteFile(filename, []byte(content), os.ModePerm)
         if err != nil {
             log.Println("Error writing file", filename)
         }
@@ -113,7 +112,6 @@ package main
 
 import (
     "fmt"
-    "io/ioutil"
     "log"
     "math/rand"
     "os"
@@ -269,7 +267,7 @@ func createFiles(chanIn <-chan FileInfo, numberOfWorkers int) <-chan FileInfo {
                     // do the jobs
                     filePath := filepath.Join(tempPath, job.FileName)
                     content := randomString(contentLength)
-                    err := ioutil.WriteFile(filePath, []byte(content), os.ModePerm)
+                    err := os.WriteFile(filePath, []byte(content), os.ModePerm)
 
                     log.Println("worker", workerIndex, "working on", job.FileName, "file generation")
 
diff --git a/content/B-server-handler-http-request-cancellation.md b/content/B-server-handler-http-request-cancellation.md
@@ -26,6 +26,7 @@ import (
 	"net/http"
 	"strings"
 	"time"
+	"log"
 )
 
 func handleIndex(w http.ResponseWriter, r *http.Request) {
@@ -97,7 +98,7 @@ go func() {
     // do the process here
     // simulate a long-time request by putting 10 seconds sleep
     
-    body, err := ioutil.ReadAll(r.Body)
+    body, err := io.ReadAll(r.Body)
     // ...
 
     time.Sleep(10 * time.Second)
diff --git a/content/B-simple-configuration.md b/content/B-simple-configuration.md
@@ -51,7 +51,6 @@ package conf
 
 import (
     "encoding/json"
-    "io/ioutil"
     "os"
     "path/filepath"
     "time"
@@ -93,7 +92,7 @@ func init() {
         return
     }
 
-    bts, err := ioutil.ReadFile(filepath.Join(basePath, "conf", "config.json"))
+    bts, err := os.ReadFile(filepath.Join(basePath, "conf", "config.json"))
     if err != nil {
         panic(err)
         return
diff --git a/content/C-advanced-configuration-viper.md b/content/C-advanced-configuration-viper.md
@@ -58,6 +58,11 @@ Berikut merupakan list format yang didukung oleh viper.
  - properties
  - props
  - prop
+ - env
+ - dotenv
+ - tfvars
+ - ini
+ - hcl
 
 Fungsi `.AddConfigPath()` digunakan untuk mendaftarkan path folder di mana file-file konfigurasi berada. Fungsi ini bisa dipanggil beberapa kali, jika memang ada banyak file konfigurasi tersimpan dalam path berbeda.
 
diff --git a/content/C-golang-ftp.md b/content/C-golang-ftp.md
@@ -157,7 +157,7 @@ if err != nil {
     log.Fatal(err.Error())
 }
 
-test1ContentInBytes, err := ioutil.ReadAll(fileTest1)
+test1ContentInBytes, err := io.ReadAll(fileTest1)
 fileTest1.Close()
 if err != nil {
     log.Fatal(err.Error())
@@ -166,9 +166,9 @@ if err != nil {
 fmt.Println(" ->", fileTest1Path, "->", string(test1ContentInBytes))
 ```
 
-Baca isi objek response tersebut menggunakan method `.Read()` miliknya, atau bisa juga menggunakan `ioutil.ReadAll()` lebih praktisnya (nilai baliknya bertipe `[]byte` maka cast ke tipe `string` terlebih dahulu untuk menampilkan isinya).
+Baca isi objek response tersebut menggunakan method `.Read()` miliknya, atau bisa juga menggunakan `io.ReadAll()` lebih praktisnya (nilai baliknya bertipe `[]byte` maka cast ke tipe `string` terlebih dahulu untuk menampilkan isinya).
 
-> Jangan lupa untuk import package `io/ioutil`.
+> Jangan lupa untuk import package `io`.
 
 Di kode di atas file `test1.txt` dibaca. Lakukan operasi yang sama pada file `somefolder/test3.txt`.
 
@@ -179,7 +179,7 @@ if err != nil {
     log.Fatal(err.Error())
 }
 
-test2ContentInBytes, err := ioutil.ReadAll(fileTest2)
+test2ContentInBytes, err := io.ReadAll(fileTest2)
 fileTest2.Close()
 if err != nil {
     log.Fatal(err.Error())
diff --git a/content/C-golang-jwt.md b/content/C-golang-jwt.md
@@ -120,7 +120,6 @@ import (
 	"context"
 	"encoding/json"
 	"fmt"
-	"io/ioutil"
 	"net/http"
 	"os"
 	"path/filepath"
@@ -261,7 +260,7 @@ Bagian otentikasi dan generate token sebenarnya cukup sampai di sini. Tapi seben
 func authenticateUser(username, password string) (bool, M) {
 	basePath, _ := os.Getwd()
 	dbPath := filepath.Join(basePath, "users.json")
-	buf, _ := ioutil.ReadFile(dbPath)
+	buf, _ := os.ReadFile(dbPath)
 
 	data := make([]M, 0)
 	err := json.Unmarshal(buf, &data)
diff --git a/content/C-golang-ssh-sftp.md b/content/C-golang-ssh-sftp.md
@@ -15,7 +15,6 @@ package main
 
 import (
     "golang.org/x/crypto/ssh"
-    "io/ioutil"
     "log"
     "os"
 )
@@ -57,7 +56,7 @@ sshConfig := &ssh.ClientConfig{
 }
 
 func PublicKeyFile(file string) ssh.AuthMethod {
-    buffer, err := ioutil.ReadFile(file)
+    buffer, err := os.ReadFile(file)
     if err != nil {
         return nil
     }
diff --git a/content/C-secure-insecure-client-http-request.md b/content/C-secure-insecure-client-http-request.md
@@ -109,7 +109,7 @@ Isi `client.Transport` dengan konfigurasi secure request. Hapus saja konfigurasi
 Kurang lebih kode-nya seperti berikut.
 
 ```go
-certFile, err := ioutil.ReadFile("server.crt")
+certFile, err := os.ReadFile("server.crt")
 if err != nil {
     return nil, err
 }
diff --git a/content/CONTRIBUTING.md b/content/CONTRIBUTING.md
@@ -26,6 +26,7 @@ Berikut merupakan *hall of fame* kontributor yang sudah berbaik hati menyisihkan
 
 1. [Acep Saepudin](https://github.com/acepsaepudin)
 1. [Adev Saputra](https://github.com/adev22)
+1. [Afifurrohman](afifurrohman-id)
 1. [Agus Budiono](https://github.com/dyon048)
 1. [Ahmad Syafiq Aqil Wafi](https://github.com/Syafiqjos)
 1. [Akul Nurislamimanudin](https://github.com/akulnurislam)
diff --git a/content/D-golang-web-socket-chatting-app.md b/content/D-golang-web-socket-chatting-app.md
@@ -34,7 +34,7 @@ import (
     "fmt"
     "github.com/gorilla/websocket"
     gubrak "github.com/novalagung/gubrak/v2"
-    "io/ioutil"
+    "os"
     "log"
     "net/http"
     "strings"
@@ -91,7 +91,7 @@ Selanjutnya buat fungsi `main()`, siapkan satu buah rute, `/`, isinya menampilka
 ```go
 func main() {
     http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
-        content, err := ioutil.ReadFile("index.html")
+        content, err := os.ReadFile("index.html")
         if err != nil {
             http.Error(w, "Could not open requested file", http.StatusInternalServerError)
             return
diff --git a/content/D-google-api-search.md b/content/D-google-api-search.md
@@ -56,7 +56,10 @@ package main
 
 import (
 	"context"
+	"io"
 	"fmt"
+	"errors"
+	"time"
 	"net/http"
 )
 
@@ -242,7 +245,7 @@ go func() {
 
 	if resp != nil {
 		defer resp.Body.Close()
-		resData, err := ioutil.ReadAll(resp.Body)
+		resData, err := io.ReadAll(resp.Body)
 		if err != nil {
 			innerChanErr <- err
 			return
diff --git a/etc/fix-ebook.go b/etc/fix-ebook.go
@@ -3,7 +3,6 @@ package main
 import (
 	"flag"
 	"fmt"
-	"io/ioutil"
 	"log"
 	"os"
 	"path/filepath"
@@ -34,7 +33,7 @@ func preAdjustment() {
 	basePath, _ := os.Getwd()
 	readmePath := filepath.Join(basePath, "README.md")
 
-	buf, err := ioutil.ReadFile(readmePath)
+	buf, err := os.ReadFile(readmePath)
 	if err != nil {
 		log.Fatal(err.Error())
 	}
@@ -44,7 +43,7 @@ func preAdjustment() {
 	versionToFind := `((VERSION))`
 	mdString = strings.ReplaceAll(mdString, versionToFind, getVersion())
 
-	err = ioutil.WriteFile(readmePath, []byte(mdString), 0644)
+	err = os.WriteFile(readmePath, []byte(mdString), 0644)
 	if err != nil {
 		log.Fatal(err.Error())
 	}
@@ -61,7 +60,7 @@ func preAdjustment() {
 			return nil
 		}
 
-		buf, err := ioutil.ReadFile(path)
+		buf, err := os.ReadFile(path)
 		if err != nil {
 			return err
 		}
@@ -72,7 +71,7 @@ func preAdjustment() {
 		htmlString = strings.ReplaceAll(htmlString, substackEmbedToRemove, "")
 
 		// ==== update file
-		err = ioutil.WriteFile(path, []byte(strings.TrimSpace(htmlString)), info.Mode())
+		err = os.WriteFile(path, []byte(strings.TrimSpace(htmlString)), info.Mode())
 		if err != nil {
 			return err
 		}
diff --git a/etc/fix-webbook.go b/etc/fix-webbook.go
