Add hostnames to database-output of link

Grafana is currently not able to resolve the target.id or source.id
into a human readable hostname. Therefore reading the neighbour
graphs is quite difficult for humans. To resolve this, we add the
additional tags source.hostname and target.hostname to the influx
link measurements.

In PR  #197

database/influxdb/link.go

@@ -14,6 +14,12 @@ func (conn *Connection) InsertLink(link *runtime.Link, t time.Time) {
 	tags.SetString("source.addr", link.SourceAddress)
 	tags.SetString("target.id", link.TargetID)
 	tags.SetString("target.addr", link.TargetAddress)
+	if link.SourceHostname != "" {
+		tags.SetString("source.hostname", link.SourceHostname)
+	}
+	if link.TargetHostname != "" {
+		tags.SetString("target.hostname", link.TargetHostname)
+	}
 
 	conn.addPoint(MeasurementLink, tags, models.Fields{"tq": link.TQ * 100}, t)
 }

runtime/node.go

@@ -22,9 +22,11 @@ type Node struct {
 // Link represents a link between two nodes
 type Link struct {
 	SourceID      string
+	SourceHostname string
 	SourceAddress string
 	TargetID      string
 	TargetAddress string
+	TargetHostname string
 	TQ            float32
 }
 

runtime/nodes.go

@@ -117,13 +117,24 @@ func (nodes *Nodes) NodeLinks(node *Node) (result []Link) {
 	for sourceMAC, batadv := range neighbours.Batadv {
 		for neighbourMAC, link := range batadv.Neighbours {
 			if neighbourID := nodes.ifaceToNodeID[neighbourMAC]; neighbourID != "" {
-				result = append(result, Link{
+				neighbour := nodes.List[neighbours.NodeID]
+
+				link := Link{
 					SourceID:      neighbours.NodeID,
 					SourceAddress: sourceMAC,
 					TargetID:      neighbourID,
 					TargetAddress: neighbourMAC,
 					TQ:            float32(link.Tq) / 255.0,
-				})
+				}
+
+				if neighbour.Nodeinfo != nil {
+					link.SourceHostname = neighbour.Nodeinfo.Hostname
+				}
+				if node.Nodeinfo != nil {
+					link.TargetHostname = node.Nodeinfo.Hostname
+				}
+
+				result = append(result, link)
 			}
 		}
 	}