added member provider.

internal/member/file/adapter.go

@@ -0,0 +1,128 @@
+package file
+
+import (
+	"encoding/json"
+	"fmt"
+	"io/ioutil"
+	"os"
+	"sync"
+
+	"demodesk/neko/internal/types"
+)
+
+func New(file string) types.MemberManager {
+	return &MemberManagerCtx{
+		file: file,
+		mu:   sync.Mutex{},
+	}
+}
+
+type MemberManagerCtx struct {
+	file string
+	mu   sync.Mutex
+}
+
+func (manager *MemberManagerCtx) Connect() error {
+	return nil
+}
+
+func (manager *MemberManagerCtx) Disconnect() error {
+	return nil
+}
+
+func (manager *MemberManagerCtx) Insert(id string, profile types.MemberProfile) error {
+	manager.mu.Lock()
+	defer manager.mu.Unlock()
+
+	profiles, err := manager.deserialize()
+	if err != nil {
+		return err
+	}
+
+	_, ok := profiles[id]
+	if ok {
+		return fmt.Errorf("Member ID already exists.")
+	}
+
+	profiles[id] = profile
+
+	return manager.serialize(profiles)
+}
+
+func (manager *MemberManagerCtx) Update(id string, profile types.MemberProfile) error {
+	manager.mu.Lock()
+	defer manager.mu.Unlock()
+
+	profiles, err := manager.deserialize()
+	if err != nil {
+		return err
+	}
+
+	_, ok := profiles[id]
+	if !ok {
+		return fmt.Errorf("Member ID does not exist.")
+	}
+
+	profiles[id] = profile
+
+	return manager.serialize(profiles)
+}
+
+func (manager *MemberManagerCtx) Delete(id string) error {
+	manager.mu.Lock()
+	defer manager.mu.Unlock()
+
+	profiles, err := manager.deserialize()
+	if err != nil {
+		return err
+	}
+
+	_, ok := profiles[id]
+	if !ok {
+		return fmt.Errorf("Member ID does not exist.")
+	}
+
+	delete(profiles, id)
+
+	return manager.serialize(profiles)
+}
+
+func (manager *MemberManagerCtx) Select() (map[string]types.MemberProfile, error) {
+	manager.mu.Lock()
+	defer manager.mu.Unlock()
+
+	profiles, err := manager.deserialize()
+	return profiles, err
+}
+
+func (manager *MemberManagerCtx) deserialize() (map[string]types.MemberProfile, error) {
+	file, err := os.OpenFile(manager.file, os.O_RDONLY|os.O_CREATE, os.ModePerm)
+	if err != nil {
+		return nil, err
+	}
+
+	raw, err := ioutil.ReadAll(file)
+	if err != nil {
+		return nil, err
+	}
+
+	if len(raw) == 0 {
+		return map[string]types.MemberProfile{}, nil
+	}
+
+	var profiles map[string]types.MemberProfile
+	if err := json.Unmarshal([]byte(raw), &profiles); err != nil {
+		return nil, err
+	}
+
+	return profiles, nil
+}
+
+func (manager *MemberManagerCtx) serialize(data map[string]types.MemberProfile) error {
+	raw, err := json.Marshal(data)
+	if err != nil {
+		return err
+	}
+
+	return ioutil.WriteFile(manager.file, raw, os.ModePerm)
+}