109 lines
2.4 KiB
Go
109 lines
2.4 KiB
Go
package sensor
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import (
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"context"
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"fmt"
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"io/ioutil"
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"path/filepath"
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"strconv"
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"strings"
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"sync"
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"time"
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"github.com/go-flucky/flucky/pkg/internal/format"
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"github.com/go-flucky/flucky/pkg/types"
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uuid "github.com/satori/go.uuid"
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)
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// DS18B20 is a sensor to measure humidity and temperature.
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type DS18B20 struct {
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*types.Sensor
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}
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func (s *DS18B20) ID() string {
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return s.SensorID
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}
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// Read measured values
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func (s *DS18B20) Read() ([]*types.MeasuredValue, error) {
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if s.WireID == nil {
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return nil, fmt.Errorf("WireID is not specified for sensor %v", s.Name())
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}
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data, err := ioutil.ReadFile(filepath.Join("/sys/bus/w1/devices", *s.WireID, "/w1_slave"))
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if err != nil {
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return nil, fmt.Errorf("Can not read data from sensor %v", s.SensorName)
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}
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raw := string(data)
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i := strings.LastIndex(raw, "t=")
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if i == -1 {
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return nil, errorReadData
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}
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c, err := strconv.ParseFloat(raw[i+2:len(raw)-1], 64)
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if err != nil {
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return nil, errorParseData
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}
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temperatureValue := c / 1000
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measuredValues := []*types.MeasuredValue{
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&types.MeasuredValue{
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ID: uuid.NewV4().String(),
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Value: float64(temperatureValue),
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ValueType: types.MeasuredValueTypeTemperature,
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FromDate: format.FormatedTime(),
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TillDate: format.FormatedTime(),
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SensorID: s.SensorID,
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},
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}
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return measuredValues, nil
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}
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// ReadChannel reads the measured values from the sensor and writes them to a
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// channel.
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func (s *DS18B20) ReadChannel(measuredValueChannel chan<- *types.MeasuredValue, errorChannel chan<- error, wg *sync.WaitGroup) {
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if wg != nil {
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defer wg.Done()
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}
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measuredValues, err := s.Read()
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if err != nil {
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errorChannel <- err
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return
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}
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for _, measuredValue := range measuredValues {
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measuredValueChannel <- measuredValue
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}
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}
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// ReadContinously reads the measured values continously from the sensor and
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// writes them to a channel.
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func (s *DS18B20) ReadContinously(ctx context.Context, measuredValueChannel chan<- *types.MeasuredValue, errorChannel chan<- error) {
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for {
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select {
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case <-ctx.Done():
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errorChannel <- fmt.Errorf("%v: Context closed: %v", s.SensorName, ctx.Err())
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return
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default:
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s.ReadChannel(measuredValueChannel, errorChannel, nil)
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}
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}
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}
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// Ticker returns a new ticker, which tick every when the sensor should be read
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func (s *DS18B20) Ticker() *time.Ticker {
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duration, err := time.ParseDuration(s.TickDuration)
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if err != nil {
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duration = time.Minute
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}
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return time.NewTicker(duration)
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}
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