chore: init repository

internal/storage/dao/postgresql/database_postgresql.go

@@ -0,0 +1,43 @@
+package postgresql
+
+import (
+	"database/sql"
+	"fmt"
+	"john/internal/storage/dao"
+	"john/internal/utils"
+
+	"github.com/lib/pq"
+)
+
+const (
+	pgCodeUniqueViolation     = "23505"
+	pgCodeForeingKeyViolation = "23503"
+)
+
+func HandlePgError(e *pq.Error) error {
+	if e.Code == pgCodeUniqueViolation {
+		return dao.NewDAOError(dao.ErrTypeDuplicate, e)
+	}
+
+	if e.Code == pgCodeForeingKeyViolation {
+		return dao.NewDAOError(dao.ErrTypeForeignKeyViolation, e)
+	}
+	return e
+}
+
+type DatabasePostgreSQL struct {
+	Session *sql.DB
+}
+
+func NewDatabasePostgreSQL(connectionURI string) *DatabasePostgreSQL {
+	db, err := sql.Open("postgres", connectionURI)
+	if err != nil {
+		utils.GetLogger().WithError(err).Fatal("Unable to get a connection to the postgres db")
+	}
+	err = db.Ping()
+	if err != nil {
+		fmt.Println(err)
+		utils.GetLogger().WithError(err).Fatal("Unable to ping the postgres db")
+	}
+	return &DatabasePostgreSQL{Session: db}
+}