create basic controller

pkg/game/controller.go

@@ -0,0 +1,56 @@
+package game
+
+import (
+	"fmt"
+
+	"github.com/google/uuid"
+	"github.com/iliadenisov/galaxy/pkg/repo"
+)
+
+type ctrl struct {
+	param Param
+	repo  Repo
+}
+
+type Param struct {
+	StoragePath string
+}
+
+func ComposeGame(configure func(*Param), races []string) (gameID uuid.UUID, err error) {
+	control(configure, func(c *ctrl) { c.execute(func(r Repo) { gameID, err = newGame(r, races) }) })
+	return
+}
+
+func newController(configure func(*Param)) (*ctrl, error) {
+	c := &Param{
+		StoragePath: ".",
+	}
+	if configure != nil {
+		configure(c)
+	}
+	r, err := repo.NewFileRepo(c.StoragePath)
+	if err != nil {
+		return nil, err
+	}
+	return &ctrl{
+		param: *c,
+		repo:  r,
+	}, nil
+}
+
+func control(configure func(*Param), consumer func(*ctrl)) error {
+	c, err := newController(configure)
+	if err != nil {
+		return err
+	}
+	consumer(c)
+	return nil
+}
+
+func (c *ctrl) execute(consumer func(Repo)) error {
+	if err := c.repo.Lock(); err != nil {
+		return fmt.Errorf("execute: lock failed: %s", err)
+	}
+	consumer(c.repo)
+	return c.repo.Release()
+}