initial simple peer, add config reader

config/conifg.go

@@ -0,0 +1,36 @@
+package config
+
+import (
+	"strings"
+
+	"github.com/spf13/viper"
+	"github.com/urfave/cli"
+)
+
+type Config struct {
+	Port string
+	Dest string
+}
+
+var C Config
+
+func MustRead(c *cli.Context) error {
+	viper.SetConfigType("yaml")
+	viper.SetConfigName("config")
+	viper.AddConfigPath(".")          // adding home directory as first search path
+	viper.SetEnvPrefix("slowlorisdb") // so viper.AutomaticEnv will get matching envvars starting with O2M_
+	viper.AutomaticEnv()              // read in environment variables that match
+	viper.SetEnvKeyReplacer(strings.NewReplacer(".", "_"))
+
+	if c.GlobalString("config") != "" {
+		viper.SetConfigFile(c.GlobalString("config"))
+	}
+
+	if err := viper.ReadInConfig(); err != nil {
+		return err
+	}
+	if err := viper.Unmarshal(&C); err != nil {
+		return err
+	}
+	return nil
+}