feat: add migrate cmd

pkg/postgres/postgres.go

@@ -0,0 +1,39 @@
+package postgres
+
+import (
+	"database/sql"
+
+	_ "github.com/lib/pq"
+	"github.com/pkg/errors"
+	log "github.com/sirupsen/logrus"
+	"github.com/spf13/viper"
+)
+
+func GetDB(cfgFile string) (*sql.DB, error) {
+	var conf Config
+	v := viper.New()
+	v.SetConfigType("toml")
+	v.SetConfigFile(cfgFile)
+	v.AddConfigPath(".")
+
+	if err := v.ReadInConfig(); err != nil {
+		return nil, errors.Wrap(err, "read config file")
+	}
+
+	if err := v.UnmarshalKey(DefaultPrefix, &conf); err != nil {
+		return nil, errors.Wrap(err, "unmarshal config")
+	}
+
+	log.Debugf("connect postgres with dsn: '%s'", conf.DSN())
+	db, err := sql.Open("postgres", conf.DSN())
+	if err != nil {
+		return nil, errors.Wrap(err, "connect database")
+	}
+
+	if err := db.Ping(); err != nil {
+		db.Close()
+		return nil, errors.Wrap(err, "ping database")
+	}
+
+	return db, err
+}