Update README.md

README.md

@@ -1,25 +1,43 @@
 # GO GRPC BASIC
 
 ## Requirements
-check other branch to step by step create project 
+### `Check other branch to step by step create project from 1/dev, 2/grpc-gateway, etc`
+
 ### Validate Go Installation
 ```bash
 $ go version
 go version go1.18.3 linux/amd64
 ```
 
+### Add GOPATH
+add/edit to your ~/.bashrc or ~/.zshrc file
+```bash
+export GOPATH=/home/{your-user?}/go
+```
+
+dont forget to execute, 
+to reload bash
+```bash
+source ~/.bashrc
+```
+to reload zsh
+```bash
+source ~/.zshrc
+```
+
 ### Validate GOPATH
 ```bash
-echo $GOPATH
+$ echo $GOPATH
+/home/aji/go
 ```
 
 ### Start Project in Go
 ```bash
-cd $GOPATH/src
-mkdir -p github.com/ajikamaludin/go-grpc_basic 
-cd github.com/ajikamaludin/go-grpc_basic 
-go mod init github.com/ajikamaludin/go-grpc_basic
-go mod tidy
+$ cd $GOPATH/src
+$ mkdir -p github.com/ajikamaludin/go-grpc_basic 
+$ cd github.com/ajikamaludin/go-grpc_basic 
+$ go mod init github.com/ajikamaludin/go-grpc_basic
+$ go mod tidy
 ```
 
 ### Install Protoc
@@ -48,14 +66,14 @@ go install github.com/grpc-ecosystem/grpc-gateway/protoc-gen-swagger@latest
 ```
 
 ### Add PATH
-add to your ~/.bashrc or ~/.zshrc file
+add/edit to your ~/.bashrc or ~/.zshrc file
 ```bash
 export PATH="$PATH:$GOPATH/bin"
 ```
 ### Validate Protoc Dependency Golang Installation
 ```bash
 ~ ❯ ls $GOPATH/bin                                             
-dlv         gopls    protoc-gen-go       protoc-gen-grpc-gateway  revel
+dlv         gopls    protoc-gen-go       protoc-gen-grpc-gateway 
 go-outline  grpcurl  protoc-gen-go-grpc  protoc-gen-swagger
 ```
 
@@ -63,6 +81,7 @@ go-outline  grpcurl  protoc-gen-go-grpc  protoc-gen-swagger
 ### Setup Project 
 - create `proto` dir 
 - create versioning dir and service dir `health`
+- exec `get-lib.sh` in `proto` dir to download / get important library to use by `health.proto` usage is in compile proto file
 - create proto file `health.proto`
 - compile / generate proto with `compile-proto.sh` in proto dir
 
@@ -115,7 +134,7 @@ service HealthService {
     }
 }
 ```
-- re - compile / re - generate proto with `compile-proto.sh` in proto dir
+- re - compile / re - generate proto with execute `compile-proto.sh` in proto dir
 - `go mod tidy`
 - `go get "github.com/gorilla/handlers"` TODO: what is for ?
 - create `http.go` in router dir and implement NewHTTPServer and register health api service 
@@ -206,11 +225,28 @@ runtime.HTTPError = errors.CustomHTTPError
 
 ### Jwt ( Json Web Tokens ) Auth 
 - add jwt configs to `config.yaml`, jwt: issuer: ajikamaludin, key: P@ssw0rd, type: Bearer
-- changes `pkg/v1/config/config.go` add new config struct and validate config, [UPDATE] change New to GetInstance for singleton config
+- changes `pkg/v1/config/config.go` add new config struct and validate config, **[UPDATE]** change New to GetInstance for singleton config
+```go
+var lock = &sync.Mutex{}
+var config *Config
+
+func GetInstance() (*Config, error) {
+	if config == nil {
+		lock.Lock()
+		defer lock.Unlock()
+		config, err := New()
+		if err != nil {
+			return nil, err
+		}
+		return config, nil
+	}
+	return config, nil
+}
+```
 - changes `pkg/v1/utils/constants/constants.go` to add new const for jwt token expired and refresh token expired
 - `go get github.com/dgrijalva/jwt-go`, lib to handle jwt token in go
 - create new pkg `pkg/v1/jwt/jwt.go`, implement Generate token and Claim token
-- create new proto `proto/v1/auth/auth.proto` auth for login and register service, recompile `sh compile-proto.sh` [UPDATE]
+- create new proto `proto/v1/auth/auth.proto` auth for login and register service, recompile `sh compile-proto.sh` **[UPDATE]**
 - implement `api/v1/auth/auth.go`, `api/v1/auth/login.go` and `api/v1/auth/register.go`
 - register new grpc service to grpc server
 ```go

pkg/v1/config/config.go

@@ -46,7 +46,7 @@ func GetInstance() (*Config, error) {
 	if config == nil {
 		lock.Lock()
 		defer lock.Unlock()
-		config, err := new()
+		config, err := New()
 		if err != nil {
 			return nil, err
 		}
@@ -55,7 +55,7 @@ func GetInstance() (*Config, error) {
 	return config, nil
 }
 
-func new() (*Config, error) {
+func New() (*Config, error) {
 	cfgPath, err := parseFlag()
 	if err != nil {
 		log.Fatal(err)