add repository draft

service_a/internal/app/db.go

@@ -0,0 +1,24 @@
+package app
+
+import (
+	"context"
+	"log/slog"
+
+	"github.com/jackc/pgx/v5/pgxpool"
+	_ "github.com/jackc/pgx/v5/stdlib"
+)
+
+func NewPGXPool(datasource string) *pgxpool.Pool {
+	dbPool, err := pgxpool.New(context.Background(), datasource)
+	if err != nil {
+		slog.Error("error connecting to database", "error", err, "datasource", datasource)
+		panic(err)
+	}
+
+	if err := dbPool.Ping(context.Background()); err != nil {
+		slog.Error("error pinging database, maybe incorrect datasource", "error", err, "datasource", datasource)
+		panic(err)
+	}
+	slog.Info("connected to database", "datasource", datasource)
+	return dbPool
+}