Restructure app

app/cfg/cfg.go

@@ -0,0 +1,88 @@
+package cfg
+
+import (
+	"fmt"
+	"os"
+
+	"github.com/kelseyhightower/envconfig"
+	"github.com/sirupsen/logrus"
+	"gopkg.in/yaml.v3"
+)
+
+type configStruct struct {
+	Database struct {
+		Host     string `yaml:"host"`
+		Port     string `yaml:"port"`
+		Name     string `yaml:"name"`
+		Username string `yaml:"username"`
+		Password string `yaml:"password" json:"-"`
+	} `yaml:"database"`
+	Application struct {
+		LogLevel        string `yaml:"logLevel"`
+		LogFile         string `yaml:"logFile"`
+		Debug           bool   `yaml:"debug"`
+		DebugSQL        bool   `yaml:"debugSQL"`
+		DisableSendMail bool   `yaml:"disableSendMail"`
+		IsProduction    bool   `yaml:"isProduction"`
+		LoopDelay       uint32 `yaml:"loopDelay"`
+	} `yaml:"application"`
+	SMTP struct {
+		Host      string `yaml:"host"`
+		Port      int    `yaml:"port"`
+		Username  string `yaml:"username"`
+		Password  string `yaml:"password" json:"-"`
+		StartTLS  bool   `yaml:"startTLS"`
+		UseTLS    bool   `yaml:"useTLS"`
+		FromEmail string `yaml:"fromEmail"`
+	} `yaml:"smtp"`
+}
+
+const DEFAULT_CONFIG_FILE = "config.yaml"
+const ENV_PREFIX = "MAILSENDER"
+
+var Config configStruct
+var log = logrus.New()
+
+func processError(err error) {
+	log.Error("Config file error: " + err.Error())
+	os.Exit(2)
+}
+
+func readFile(cfgFile string, cfg *configStruct) {
+	f, err := os.Open(cfgFile)
+	if err != nil {
+		processError(err)
+	} else {
+		decoder := yaml.NewDecoder(f)
+		err = decoder.Decode(cfg)
+		if err != nil {
+			processError(err)
+		}
+	}
+	defer f.Close()
+}
+
+func readEnv(cfg *configStruct) {
+	err := envconfig.Process(ENV_PREFIX, cfg)
+	if err != nil {
+		processError(err)
+	}
+}
+
+func Init() {
+	cfgFile := os.Getenv("MAILSENDER_CONFIG")
+	if cfgFile == "" {
+		cfgFile = DEFAULT_CONFIG_FILE
+	}
+
+	readFile(cfgFile, &Config)
+	readEnv(&Config)
+
+	maskedCfg := Config
+	maskedCfg.Database.Password = "**password hidden**"
+	maskedCfg.SMTP.Password = "**password hidden**"
+
+	fmt.Println("--- CONFIG -------------------------------")
+	fmt.Println(maskedCfg)
+	fmt.Println("------------------------------------------")
+}