fix(pkg/config): use storage endpoints

changes:
- Only one storage endpoint can be defined. This consists of a URL which
  can be used to specify whether the data is to be stored in a file or
  in a database.

pkg/sensor/sensor.go

@@ -14,30 +14,30 @@ import (
 // Read measured values from sensors
 func Read(ctx context.Context, sensors []Sensor) ([]*types.MeasuredValue, error) {
 
-	measuredValuesChannel := make(chan []*types.MeasuredValue, len(sensors))
+	measuredValueChannel := make(chan *types.MeasuredValue, len(sensors))
 	errorChannel := make(chan error, len(sensors))
 
-	ReadChannel(ctx, sensors, measuredValuesChannel, errorChannel)
+	ReadChannel(ctx, sensors, measuredValueChannel, errorChannel)
 
 	errors := collect.Errors(errorChannel)
 	if len(errors) > 0 {
 		return nil, prittyprint.FormatErrors(errors)
 	}
 
-	measuredValues := collect.MeasuredValues(measuredValuesChannel)
+	measuredValues := collect.MeasuredValues(measuredValueChannel)
 
 	return measuredValues, nil
 }
 
 // ReadChannel reads the measured values from sensors and writes them to a
 // channel.
-func ReadChannel(ctx context.Context, sensors []Sensor, measuredValuesChannel chan<- []*types.MeasuredValue, errorChannel chan<- error) {
+func ReadChannel(ctx context.Context, sensors []Sensor, measuredValueChannel chan<- *types.MeasuredValue, errorChannel chan<- error) {
 
 	wg := new(sync.WaitGroup)
 	wg.Add(len(sensors))
 
 	for _, sensor := range sensors {
-		go sensor.ReadChannel(measuredValuesChannel, errorChannel, wg)
+		go sensor.ReadChannel(measuredValueChannel, errorChannel, wg)
 	}
 
 	wg.Wait()
@@ -45,14 +45,14 @@ func ReadChannel(ctx context.Context, sensors []Sensor, measuredValuesChannel ch
 
 // ReadContinuously reads the measured values continously from sensors and writes
 // them to a channel.
-func ReadContinuously(ctx context.Context, sensors []Sensor, measuredValuesChannel chan<- []*types.MeasuredValue, errorChannel chan<- error) {
+func ReadContinuously(ctx context.Context, sensors []Sensor, measuredValueChannel chan<- *types.MeasuredValue, errorChannel chan<- error) {
 	for {
 		select {
 		case <-ctx.Done():
 			errorChannel <- fmt.Errorf("Context closed: %v", ctx.Err())
 			return
 		default:
-			ReadChannel(ctx, sensors, measuredValuesChannel, errorChannel)
+			ReadChannel(ctx, sensors, measuredValueChannel, errorChannel)
 		}
 	}
 }