golang 優雅讀取環境變數 env

有時候，env會非常多，尤其是現在很多應用都放在doker裡，很多配置都是通過環境變數讀取，所以希望讀取的env能與golang的struct能對應，比如：```CONFIG_APP=ENVAPPCONFIG_DEBUG=1CONFIG_HOSTS=192.168.0.1,127.0.0.1CONFIG_TIMEOUT=5sCONFIG_REDISVERSION=3.2CONFIG_REDIS_HOST=rdbCONFIG_REDIS_PORT=6379CONFIG_MYSQL_HOST=mysqldbCONFIG_MYSQL_PORT=3306```可以通過：```golangimport ("fmt""time""os""github.com/timest/env")type config struct {App stringPort int `default:"8000"`IsDebug bool `env:"DEBUG"`Hosts []string `slice_sep:","`Timeout time.DurationRedis struct {Version string `sep:""` // no sep between `CONFIG` and `REDIS`Host stringPort int}MySQL struct {Version string `default:"5.7"`Host stringPort int}}func main() {cfg := new(config)err := env.Fill(cfg)if err != nil {panic(err)}fmt.Println("Home:", cfg.App)fmt.Println("Port:", cfg.Port)fmt.Println("IsDebug:", cfg.IsDebug)fmt.Println("Hosts:", cfg.Hosts, len(cfg.Hosts))fmt.Println("Duration:", cfg.Timeout)fmt.Println("Redis_Version:", cfg.Redis.Version)fmt.Println("Redis_Host:", cfg.Redis.Host)fmt.Println("Redis_Port:", cfg.Redis.Port)fmt.Println("MySQL_Version:", cfg.MySQL.Version)fmt.Println("MySQL_Name:", cfg.MySQL.Host)fmt.Println("MySQL_port:", cfg.MySQL.Port)}// output:// Home: ENV APP// Port: 8000// IsDebug: true// Hosts: [192.168.0.1 127.0.0.1] 2// Duration: 5s// Redis_Version: 3.2// Redis_Host: rdb// Redis_Port: 6379// MySQL_Version: 5.7// MySQL_Name: mysqldb// MySQL_port: 3306```如果不希望struct的名字作為env的首碼，可以：```APP=ENVAPPDEBUG=1HOSTS=192.168.0.1,127.0.0.1TIMEOUT=5sREDISVERSION=3.2REDIS_HOST=rdbREDIS_PORT=6379MYSQL_HOST=mysqldbMYSQL_PORT=3306``````func main() { cfg := new(config) env.IgnorePrefix() err := env.Fill(cfg) ...}```[https://github.com/timest/env]("github.com/timest/env") 地址。82 次點擊  ∙  1 贊