fix: add, rename and remove sensor

changes:
- Implement function to add, rename and remove sensors

pkg/config/config.go

@@ -1,6 +1,7 @@
 package config
 
 import (
+	"context"
 	"fmt"
 	"os"
 	"path/filepath"
@@ -9,6 +10,7 @@ import (
 	"time"
 
 	"github.com/volker-raschek/flucky/pkg/internal/format"
+	"github.com/volker-raschek/flucky/pkg/storage"
 
 	uuid "github.com/satori/go.uuid"
 	"github.com/volker-raschek/flucky/pkg/types"
@@ -154,21 +156,56 @@ func (cnf *Config) GetSensorByID(id string) *types.Sensor {
 	return nil
 }
 
-// RemoveSensor deletes a sensor by its name or its unique UUID
-func (cnf *Config) RemoveSensor(name string) error {
+// RemoveSensor deletes a sensor by its name or its unique UUID, If definitive
+// is set to true, the sensor will not only be removed in the configuration file
+// but also in the backend.
+func (cnf *Config) RemoveSensor(name string, definitive bool) error {
+
+	backend, err := storage.New(cnf.StorageEndpoint, nil)
+	if err != nil {
+		return err
+	}
+
 	for i, sensor := range cnf.Sensors {
 		// remove machted name
 		if !validUUID.MatchString(name) &&
 			sensor.Name == name {
 			cnf.Sensors = append(cnf.Sensors[:i], cnf.Sensors[i+1:]...)
+
+			if definitive {
+				err = backend.RemoveSensorByName(context.Background(), name)
+				if err != nil {
+					return err
+				}
+			}
+
 			return nil
 		}
 		// remove machted uuid
 		if validUUID.MatchString(name) &&
 			sensor.ID == name {
 			cnf.Sensors = append(cnf.Sensors[:i], cnf.Sensors[i+1:]...)
+
+			if definitive {
+				err = backend.RemoveSensorByID(context.Background(), name)
+				if err != nil {
+					return err
+				}
+			}
+
 			return nil
 		}
 	}
 	return fmt.Errorf("Can not find sensor %v", name)
 }
+
+// RenameSensor renamed a sensor
+func (cnf *Config) RenameSensor(oldName string, newName string) error {
+	for _, cnfSensor := range cnf.Sensors {
+		if cnfSensor.Name == oldName {
+			cnfSensor.Name = newName
+			return nil
+		}
+	}
+	return fmt.Errorf("No sensor %v found", oldName)
+}

pkg/config/io.go

@@ -45,7 +45,7 @@ func Read(configFile string) (*Config, error) {
 func Write(cnf *Config, configFile string) error {
 	if _, err := os.Stat(configFile); os.IsNotExist(err) {
 		configDir := filepath.Dir(configFile)
-		err := os.MkdirAll(configDir, os.ModeDir)
+		err := os.MkdirAll(configDir, 0775)
 		if err != nil {
 			return fmt.Errorf("Failed to create config directory %v: %v", configDir, err)
 		}