117 lines
2.1 KiB
Go
117 lines
2.1 KiB
Go
package services
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import (
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"basic-sensor-receiver/models"
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"crypto/rand"
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"math/big"
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)
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type SensorsService struct {
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ctx *Context
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}
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func (s *SensorsService) GetList() ([]models.SensorItem, error) {
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sensors := []models.SensorItem{}
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err := s.ctx.DB.Select(&sensors, "SELECT id, name, auth_key, last_contact_at FROM sensors")
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if err != nil {
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return nil, err
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}
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return sensors, nil
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}
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func (s *SensorsService) Create(name string) (*models.SensorItem, error) {
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authKey, err := generateRandomString(32)
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if err != nil {
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return nil, err
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}
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item := models.SensorItem{
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Name: name,
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AuthKey: authKey,
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}
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res, err := s.ctx.DB.Exec("INSERT INTO sensors (name, auth_key) VALUES (?, ?)", item.Name, item.AuthKey)
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if err != nil {
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return nil, err
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}
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item.Id, err = res.LastInsertId()
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if err != nil {
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return nil, err
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}
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return &item, nil
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}
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func (s *SensorsService) GetById(id int64) (*models.SensorItem, error) {
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item := models.SensorItem{}
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err := s.ctx.DB.Get(&item, "SELECT id, name, auth_key, last_contact_at FROM sensors WHERE id = $1", id)
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if err != nil {
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return nil, err
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}
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return &item, nil
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}
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func (s *SensorsService) Update(id int64, name string) (*models.SensorItem, error) {
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item, err := s.GetById(id)
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if err != nil {
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return nil, err
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}
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item.Name = name
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_, err = s.ctx.DB.Exec("UPDATE sensors SET name = ? WHERE id = ?", item.Name, item.Id)
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if err != nil {
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return nil, err
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}
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return item, nil
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}
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func (s *SensorsService) DeleteById(id int64) error {
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item, err := s.GetById(id)
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if err != nil {
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return err
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}
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_, err = s.ctx.DB.Exec("DELETE FROM sensor_values WHERE sensor_id = ?", item.Id)
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if err != nil {
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return err
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}
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_, err = s.ctx.DB.Exec("DELETE FROM sensors WHERE id = ?", item.Id)
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return err
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}
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var randomKeySource = []byte("abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789")
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func generateRandomString(length int) (string, error) {
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key := make([]byte, length)
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for i := range key {
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value, err := rand.Int(rand.Reader, big.NewInt(int64(len(randomKeySource))))
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if err != nil {
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return "", err
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}
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key[i] = randomKeySource[value.Int64()]
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}
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return string(key), nil
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}
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