git.giacomolli.uk - onehouse/blob - driver/alamo/control_settings.go

   1 package alamo
   2
   3 import (
   4         "bytes"
   5         "encoding/json"
   6         "fmt"
   7 )
   8
   9 type controlSettings struct {
  10         Mode              string  `json:"mode"`
  11         TargetTemperature float64 `json:"target_temperature"`
  12 }
  13
  14 func decodeControl(value json.RawMessage) (controlSettings, error) {
  15         var fields struct {
  16                 Mode   *string  `json:"mode"`
  17                 Target *float64 `json:"target_temperature"`
  18         }
  19
  20         decoder := json.NewDecoder(bytes.NewReader(value))
  21         decoder.DisallowUnknownFields()
  22
  23         err := decoder.Decode(&fields)
  24         if err != nil {
  25                 return controlSettings{}, fmt.Errorf("decode control settings: %w", err)
  26         }
  27
  28         if !json.Valid(value) || fields.Mode == nil || fields.Target == nil {
  29                 return controlSettings{}, fmt.Errorf("control settings must contain mode and target temperature")
  30         }
  31
  32         if *fields.Mode != "off" && *fields.Mode != "heat" {
  33                 return controlSettings{}, fmt.Errorf("control mode must be off or heat")
  34         }
  35
  36         if !finite(*fields.Target) {
  37                 return controlSettings{}, fmt.Errorf("target temperature must be finite")
  38         }
  39
  40         return controlSettings{
  41                 Mode:              *fields.Mode,
  42                 TargetTemperature: *fields.Target,
  43         }, nil
  44 }