phase 2 initial test

internal/db/db.go

@@ -0,0 +1,31 @@
+package db
+
+import (
+	"fmt"
+
+	_ "github.com/lib/pq"
+	"xorm.io/xorm"
+	"xorm.io/xorm/log"
+)
+
+func Open(dataSourceName string, debug bool) (*xorm.Engine, error) {
+	engine, err := xorm.NewEngine("postgres", dataSourceName)
+	if err != nil {
+		return nil, fmt.Errorf("open db: %w", err)
+	}
+
+	if debug {
+		engine.SetLogLevel(log.LOG_DEBUG)
+	} else {
+		engine.SetLogLevel(log.LOG_WARNING)
+	}
+
+	engine.SetMaxOpenConns(25)
+	engine.SetMaxIdleConns(5)
+
+	if err := engine.Ping(); err != nil {
+		return nil, fmt.Errorf("ping db: %w", err)
+	}
+
+	return engine, nil
+}