修复图表时间和查询区间不匹配问题

backend/internal/device/device.go

@@ -0,0 +1,135 @@
+package device
+
+import (
+	"sync"
+)
+
+// Device 设备信息
+type Device struct {
+	ID        string `json:"id"`
+	Name      string `json:"name"`
+	IP        string `json:"ip"`
+	Token     string `json:"token"`  // 设备认证令牌
+	Status    string `json:"status"` // active, inactive, offline
+	CreatedAt int64  `json:"created_at"`
+	UpdatedAt int64  `json:"updated_at"`
+}
+
+// Storage 设备存储接口
+type Storage interface {
+	// GetDevices 获取所有设备
+	GetDevices() []Device
+	// GetDevice 获取指定设备
+	GetDevice(id string) (Device, bool)
+	// GetDeviceByToken 通过令牌获取设备
+	GetDeviceByToken(token string) (Device, bool)
+	// AddDevice 添加设备
+	AddDevice(device Device) error
+	// UpdateDevice 更新设备
+	UpdateDevice(device Device) error
+	// DeleteDevice 删除设备
+	DeleteDevice(id string) error
+	// UpdateDeviceStatus 更新设备状态
+	UpdateDeviceStatus(id string, status string) error
+}
+
+// MemoryStorage 内存设备存储
+type MemoryStorage struct {
+	devices map[string]Device
+	mutex   sync.RWMutex
+}
+
+// NewMemoryStorage 创建内存设备存储实例
+func NewMemoryStorage() *MemoryStorage {
+	return &MemoryStorage{
+		devices: make(map[string]Device),
+	}
+}
+
+// GetDevices 获取所有设备
+func (s *MemoryStorage) GetDevices() []Device {
+	s.mutex.RLock()
+	defer s.mutex.RUnlock()
+
+	devices := make([]Device, 0, len(s.devices))
+	for _, device := range s.devices {
+		devices = append(devices, device)
+	}
+
+	return devices
+}
+
+// GetDevice 获取指定设备
+func (s *MemoryStorage) GetDevice(id string) (Device, bool) {
+	s.mutex.RLock()
+	defer s.mutex.RUnlock()
+
+	device, ok := s.devices[id]
+	return device, ok
+}
+
+// AddDevice 添加设备
+func (s *MemoryStorage) AddDevice(device Device) error {
+	s.mutex.Lock()
+	defer s.mutex.Unlock()
+
+	// 检查设备是否已存在
+	if _, ok := s.devices[device.ID]; ok {
+		return nil // 设备已存在，不重复添加
+	}
+
+	s.devices[device.ID] = device
+	return nil
+}
+
+// UpdateDevice 更新设备
+func (s *MemoryStorage) UpdateDevice(device Device) error {
+	s.mutex.Lock()
+	defer s.mutex.Unlock()
+
+	// 检查设备是否存在
+	if _, ok := s.devices[device.ID]; !ok {
+		return nil // 设备不存在，不更新
+	}
+
+	s.devices[device.ID] = device
+	return nil
+}
+
+// DeleteDevice 删除设备
+func (s *MemoryStorage) DeleteDevice(id string) error {
+	s.mutex.Lock()
+	defer s.mutex.Unlock()
+
+	delete(s.devices, id)
+	return nil
+}
+
+// GetDeviceByToken 通过令牌获取设备
+func (s *MemoryStorage) GetDeviceByToken(token string) (Device, bool) {
+	s.mutex.RLock()
+	defer s.mutex.RUnlock()
+
+	for _, device := range s.devices {
+		if device.Token == token {
+			return device, true
+		}
+	}
+
+	return Device{}, false
+}
+
+// UpdateDeviceStatus 更新设备状态
+func (s *MemoryStorage) UpdateDeviceStatus(id string, status string) error {
+	s.mutex.Lock()
+	defer s.mutex.Unlock()
+
+	device, ok := s.devices[id]
+	if !ok {
+		return nil // 设备不存在，不更新
+	}
+
+	device.Status = status
+	s.devices[id] = device
+	return nil
+}