70 lines
1.5 KiB
Go
70 lines
1.5 KiB
Go
package sensor
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import (
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"fmt"
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"io/ioutil"
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"os"
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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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"git.cryptic.systems/volker.raschek/flucky/pkg/internal/format"
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"git.cryptic.systems/volker.raschek/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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mutex *sync.Mutex
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}
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// Read measured values
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func (ds18b20 *DS18B20) Read() ([]*types.MeasuredValue, error) {
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// Lock multiple access
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ds18b20.mutex.Lock()
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defer ds18b20.mutex.Unlock()
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if ds18b20.WireID == nil {
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return nil, fmt.Errorf("WireID is not specified")
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}
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socketPath := filepath.Join("/sys/bus/w1/devices", *ds18b20.WireID, "/w1_slave")
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if _, err := os.Stat(socketPath); os.IsNotExist(err) {
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return nil, fmt.Errorf("Socket path not found: %v", socketPath)
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}
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/* #nosec */
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data, err := ioutil.ReadFile(socketPath)
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if err != nil {
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return nil, fmt.Errorf("Can not read data from sensor %v", ds18b20.Name)
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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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{
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ID: uuid.NewV4().String(),
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Value: float64(temperatureValue),
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ValueType: types.Temperature,
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Date: format.FormatedTime(),
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SensorID: ds18b20.ID,
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},
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}
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return measuredValues, nil
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}
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