fix(pkg/sensor): read values

pkg/sensor/ds18b20.go

@@ -27,6 +27,10 @@ func (s *DS18B20) GetSensorModel() types.SensorModel {
 // Read measured values
 func (s *DS18B20) Read() ([]types.MeasuredValue, error) {
 
+	if s.WireID == nil {
+		return nil, fmt.Errorf("WireID is not specified for sensor %v", s.Name())
+	}
+
 	data, err := ioutil.ReadFile(filepath.Join("/sys/bus/w1/devices", *s.WireID, "/w1_slave"))
 	if err != nil {
 		return nil, fmt.Errorf("Can not read data from sensor %v", s.SensorName)

pkg/sensor/sensor.go

@@ -5,38 +5,30 @@ import (
 	"fmt"
 	"sync"
 
-	"github.com/go-flucky/flucky/pkg/internal/collect"
-	"github.com/go-flucky/flucky/pkg/internal/prittyprint"
 	"github.com/go-flucky/flucky/pkg/types"
 )
 
 // Read measured values from sensors
-func Read(sensors []Sensor) ([]types.MeasuredValue, error) {
-	measuredValueChannel := make(chan types.MeasuredValue, 0)
-	errorChannel := make(chan error, 0)
+func Read(ctx context.Context, sensors []Sensor) ([]types.MeasuredValue, error) {
 
-	wg := new(sync.WaitGroup)
-	wg.Add(len(sensors))
+	// TODO: Execute Read with go function
+	cachesMeasuredValues := make([]types.MeasuredValue, 0)
 
 	for _, sensor := range sensors {
-		go sensor.ReadChannel(measuredValueChannel, errorChannel, wg)
+		measuredValues, err := sensor.Read()
+		if err != nil {
+			return nil, err
+		}
+		cachesMeasuredValues = append(cachesMeasuredValues, measuredValues...)
 	}
 
-	wg.Wait()
-
-	errors := collect.Errors(errorChannel)
-	if len(errors) > 0 {
-		return nil, prittyprint.FormatErrors(errors)
-	}
-
-	measuredValues := collect.MeasuredValues(measuredValueChannel)
-
-	return measuredValues, nil
+	return cachesMeasuredValues, nil
 }
 
 // ReadChannel reads the measured values from sensors and writes them to a
 // channel.
 func ReadChannel(ctx context.Context, sensors []Sensor, measuredValueChannel chan<- types.MeasuredValue, errorChannel chan<- error, wg *sync.WaitGroup) {
+	// TODO: Execute ReadCallel with go function if wg is available
 	for _, sensor := range sensors {
 		sensor.ReadChannel(measuredValueChannel, errorChannel, wg)
 	}