first commit

pkg/game/game.go

@@ -0,0 +1,86 @@
+package game
+
+import (
+	"cloudsave/pkg/tools/id"
+	"encoding/json"
+	"fmt"
+	"os"
+	"path/filepath"
+)
+
+type (
+	Metadata struct {
+		ID   string `json:"id"`
+		Name string `json:"name"`
+		Path string `json:"path"`
+	}
+)
+
+var (
+	roaming       string
+	datastorepath string
+)
+
+func init() {
+	var err error
+	roaming, err = os.UserConfigDir()
+	if err != nil {
+		panic("failed to get user config path: " + err.Error())
+	}
+
+	datastorepath = filepath.Join(roaming, "cloudsave", "data")
+	err = os.MkdirAll(datastorepath, 0740)
+	if err != nil {
+		panic("cannot make the datastore:" + err.Error())
+	}
+}
+
+func Add(name, path string) (Metadata, error) {
+	m := Metadata{
+		ID:   id.New(),
+		Name: name,
+		Path: path,
+	}
+
+	f, err := os.OpenFile(filepath.Join(datastorepath, m.ID, "metadata.json"), os.O_CREATE|os.O_WRONLY, 0740)
+	if err != nil {
+		return Metadata{}, fmt.Errorf("cannot open the metadata file in the datastore: %w", err)
+	}
+	defer f.Close()
+
+	e := json.NewEncoder(f)
+	err = e.Encode(m)
+	if err != nil {
+		return Metadata{}, fmt.Errorf("cannot write into the metadata file in the datastore: %w", err)
+	}
+
+	return m, nil
+}
+
+func All() ([]Metadata, error) {
+	ds, err := os.ReadDir(datastorepath)
+	if err != nil {
+		return nil, fmt.Errorf("cannot open the datastore: %w", err)
+	}
+
+	var datastore []Metadata
+	for _, d := range ds {
+		content, err := os.ReadFile(filepath.Join(datastorepath, d.Name(), "metadata.json"))
+		if err != nil {
+			continue
+		}
+
+		var m Metadata
+		err = json.Unmarshal(content, &m)
+		if err != nil {
+			return nil, fmt.Errorf("corrupted datastore: failed to parse %s/metadata.json: %w", d.Name(), err)
+		}
+
+		datastore = append(datastore, m)
+	}
+	return datastore, nil
+}
+
+func DatastorePath() string {
+	return datastorepath
+}