feat: string-unpack api

cmd/api/config.go

@@ -0,0 +1,24 @@
+package main
+
+import (
+	"flag"
+	"time"
+
+	"github.com/kelseyhightower/envconfig"
+)
+
+type Config struct {
+	DSN              string        `envconfig:"DSN" default:"postgresql://postgres:postgres@postgres:5432/postgres?sslmode=disable"`
+	ReconnectTimeout time.Duration `envconfig:"RECONNECT_TIMEOUT" default:"2s"`
+}
+
+func (c *Config) Parse() error {
+	flag.StringVar(&c.DSN, "DSN", "", "postgresql DSN")
+	flag.Parse()
+
+	if err := envconfig.Process("", c); err != nil {
+		return err
+	}
+
+	return nil
+}