Implement database configuration and management with PostgreSQL support

1 files changed, 50 insertions, 0 deletions

diff --git a/database/database.go b/database/database.go
new file mode 100644
index 0000000..500373e
--- /dev/null
+++ b/database/database.go
@@ -0,0 +1,50 @@
+package database
+
+import (
+	"cafe/config"
+	"fmt"
+	"log"
+
+	"gorm.io/driver/postgres"
+	"gorm.io/gorm"
+	"gorm.io/gorm/logger"
+)
+
+var DB *gorm.DB
+
+func init() {
+	var err error
+
+	DSN := fmt.Sprintf("host=%s port=%d user=%s dbname=%s sslmode=%s",
+		config.Database.Host,
+		config.Database.Port,
+		config.Database.Username,
+		config.Database.Name,
+		config.Database.SSLMode,
+	)
+
+	if config.Database.Password != "" {
+		DSN += fmt.Sprintf(" password=%s", config.Database.Password)
+	}
+
+	loglevel := logger.Silent
+	if config.Server.DevMode {
+		loglevel = logger.Info
+	}
+
+	dialector := postgres.Open(DSN)
+
+	DB, err = gorm.Open(dialector, &gorm.Config{
+		Logger: logger.Default.LogMode(loglevel),
+	})
+
+	if err != nil {
+		log.Fatalf("failed to connect to database: %v", err)
+	}
+
+	if err = migrate(); err != nil {
+		log.Fatalf("failed to migrate database: %v", err)
+	}
+
+	log.Println("database connection established")
+}