Refactor and rename storage to Json

pkg/deesee/storage/json.go

@@ -0,0 +1,65 @@
+package storage
+
+import (
+	"encoding/json"
+	"errors"
+	"fmt"
+	"github.com/eslider/superherohub/pkg/deesee"
+	"os"
+	"strings"
+)
+
+// Json simple JSON memory storage.
+type Json struct {
+	path string              // Path to json file
+	list []*deesee.Superhero // List of loaded superheroes
+}
+
+// NewJson Json storage.
+func NewJson(path string) (d *Json, err error) {
+	d = &Json{
+		path: path,
+	}
+	err = d.Load(path)
+	return
+}
+
+// Load superheroes from JSON file.
+func (s *Json) Load(path string) error {
+	f, err := os.OpenFile(path, os.O_RDONLY, 0644)
+	if err != nil {
+		return fmt.Errorf("unable to read f: %w", err)
+	}
+
+	return json.NewDecoder(f).Decode(&s.list)
+}
+
+// List superheros
+func (s *Json) List() []*deesee.Superhero {
+	return s.list
+}
+
+// Put superhero.
+func (s *Json) Put(hero *deesee.Superhero) (err error) {
+	// Check if superhero superpower is acceptable
+	if !hero.IsAcceptable() {
+		return errors.New(fmt.Sprintf("Hero power is not acceptable: %s", hero.Name))
+	}
+
+	// Prevent to store duplicate superheroes
+	if deesee.FindByName(s.list, strings.TrimSpace(hero.Name)) != nil {
+		return errors.New(fmt.Sprintf("Hero already exists: %s", hero.Name))
+	}
+
+	s.list = append(s.list, hero)
+	return
+}
+
+// Persist superheroes to JSON file.
+func (s *Json) Persist() error {
+	f, err := os.OpenFile(s.path, os.O_CREATE|os.O_WRONLY|os.O_TRUNC, 0644)
+	if err != nil {
+		return fmt.Errorf("unable to write file: %w", err)
+	}
+	return json.NewEncoder(f).Encode(s.list)
+}