[BUGFIX] Fixed Graphite naming (#72)

* Bugfix: Graphite compatibility with meshviewer

* Bugfix: Bad message: Router type not sanitized

* Refactoring: Implemented replaceInvalidChars function for Graphite

database/graphite/global.go

@@ -27,7 +27,7 @@ func GlobalStatsFields(stats *runtime.GlobalStats) []graphigo.Metric {
 func (c *Connection) addCounterMap(name string, m runtime.CounterMap, t time.Time) {
 	var fields []graphigo.Metric
 	for key, count := range m {
-		fields = append(fields, graphigo.Metric{Name: name + `.` + key + `.count`, Value: count, Timestamp: t})
+		fields = append(fields, graphigo.Metric{Name: name + `.` + replaceInvalidChars(key) + `.count`, Value: count, Timestamp: t})
 	}
 	c.addPoint(fields)
 }

database/graphite/node.go

@@ -1,7 +1,6 @@
 package graphite
 
 import (
-	"strings"
 	"time"
 
 	"github.com/FreifunkBremen/yanic/runtime"
@@ -25,7 +24,7 @@ func (c *Connection) InsertNode(node *runtime.Node) {
 		return
 	}
 
-	node_prefix := MeasurementNode + `.` + stats.NodeID + `.` + strings.Replace(nodeinfo.Hostname, ".", "__", -1)
+	node_prefix := MeasurementNode + `.` + stats.NodeID + `.` + replaceInvalidChars(nodeinfo.Hostname)
 
 	addField := func(name string, value interface{}) {
 		fields = append(fields, graphigo.Metric{Name: node_prefix + "." + name, Value: value})

database/graphite/utils.go

@@ -0,0 +1,11 @@
+package graphite
+
+import (
+	"regexp"
+)
+
+var reInvalidChars = regexp.MustCompile("(?i)[^a-z0-9\\-]")
+
+func replaceInvalidChars(name string) string {
+	return reInvalidChars.ReplaceAllString(name, "_")
+}