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state.go
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state.go
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// Copyright (c) 2023 Joshua Rich <joshua.rich@gmail.com>
//
// This software is released under the MIT License.
// https://opensource.org/licenses/MIT
package tracker
import (
"bytes"
"encoding/json"
"errors"
"fmt"
"github.com/joshuar/go-hass-agent/internal/request"
"github.com/rs/zerolog/log"
)
// sensorState tracks the current state of a sensor, including the sensor value
// and whether it is registered/disabled in HA.
type sensorState struct {
data Sensor
disableCh chan bool
errCh chan error
requestData []byte
requestType request.RequestType
}
func (s *sensorState) State() interface{} {
if s.data.State() != nil {
return s.data.State()
} else {
return "Unknown"
}
}
func (s *sensorState) Units() string {
return s.data.Units()
}
// sensorState implements hass.Request so its data can be sent to the HA API
func (sensor *sensorState) RequestType() request.RequestType {
return sensor.requestType
}
func (sensor *sensorState) RequestData() json.RawMessage {
return sensor.requestData
}
func (sensor *sensorState) ResponseHandler(rawResponse bytes.Buffer) {
defer close(sensor.disableCh)
if rawResponse.Len() == 0 || rawResponse.String() == "{}" {
sensor.errCh <- fmt.Errorf("no response for %s request. Likely problem with request data", sensor.data.Name())
return
}
var r interface{}
err := json.Unmarshal(rawResponse.Bytes(), &r)
if err != nil {
sensor.errCh <- errors.New("could not unmarshal response")
return
}
response, err := assertAs[map[string]interface{}](r)
if err != nil {
sensor.errCh <- err
return
}
if v, ok := response["success"]; ok {
success, err := assertAs[bool](v)
if err != nil {
sensor.errCh <- nil
} else {
if success {
close(sensor.errCh)
} else {
sensor.errCh <- errors.New("unsuccessful update")
}
}
}
if v, ok := response[sensor.data.ID()]; ok {
status, err := assertAs[map[string]interface{}](v)
if err != nil {
sensor.errCh <- err
return
}
success, err := assertAs[bool](status["success"])
if err != nil {
sensor.errCh <- err
return
} else {
if !success {
hassErr, err := assertAs[map[string]interface{}](status["error"])
if err != nil {
sensor.errCh <- errors.New("unknown error")
} else {
sensor.errCh <- fmt.Errorf("code %s: %s", hassErr["code"], hassErr["message"])
}
} else {
close(sensor.errCh)
}
}
if _, ok := status["is_disabled"]; ok {
sensor.disableCh <- true
} else {
sensor.disableCh <- false
}
}
}
func newSensorState(s Sensor, r Registry) *sensorState {
update := &sensorState{
data: s,
disableCh: make(chan bool, 1),
errCh: make(chan error, 1),
}
var err error
if r.IsRegistered(s.ID()) {
update.requestData, err = json.Marshal(MarshalSensorUpdate(s))
update.requestType = request.RequestTypeUpdateSensorStates
} else {
update.requestData, err = json.Marshal(MarshalSensorRegistration(s))
update.requestType = request.RequestTypeRegisterSensor
}
if err != nil {
log.Debug().Err(err).
Msgf("Could not marshal sensor update for %s", s.ID())
}
return update
}
func assertAs[T any](thing interface{}) (T, error) {
if asT, ok := thing.(T); !ok {
return *new(T), errors.New("could not assert value")
} else {
return asT, nil
}
}