Remove indirection of Flags

Simplifies the code

meshviewer/meshviewer.go

@@ -11,7 +11,7 @@ import (
 type Node struct {
 	Firstseen  jsontime.Time    `json:"firstseen"`
 	Lastseen   jsontime.Time    `json:"lastseen"`
-	Flags      *Flags           `json:"flags,omitempty"`
+	Flags      Flags            `json:"flags"`
 	Statistics *Statistics      `json:"statistics"`
 	Nodeinfo   *data.NodeInfo   `json:"nodeinfo"`
 	Neighbours *data.Neighbours `json:"-"`

models/graph.go

@@ -78,7 +78,7 @@ func (builder *GraphBuilder) readNodes(nodes map[string]*Node) {
 
 	// Add links
 	for sourceID, node := range nodes {
-		if flag := node.Flags; flag == nil || flag.Online {
+		if node.Flags.Online {
 			if neighbours := node.Neighbours; neighbours != nil {
 				// Batman neighbours
 				for _, batadvNeighbours := range neighbours.Batadv {

models/graph_test.go

@@ -35,7 +35,11 @@ func testGetNodesByFile(files ...string) *Nodes {
 	}
 
 	for _, file := range files {
-		nodes.List[file] = testGetNodeByFile(file)
+		node := testGetNodeByFile(file)
+		nodes.Update(file, &data.ResponseData{
+			NodeInfo:   node.Nodeinfo,
+			Neighbours: node.Neighbours,
+		})
 	}
 
 	return nodes

models/node.go

@@ -13,7 +13,7 @@ import (
 type Node struct {
 	Firstseen  jsontime.Time    `json:"firstseen"`
 	Lastseen   jsontime.Time    `json:"lastseen"`
-	Flags      *meshviewer.Flags `json:"flags,omitempty"`
+	Flags      meshviewer.Flags `json:"flags"`
 	Statistics *data.Statistics `json:"statistics"`
 	Nodeinfo   *data.NodeInfo   `json:"nodeinfo"`
 	Neighbours *data.Neighbours `json:"-"`

models/nodes.go

@@ -56,20 +56,13 @@ func (nodes *Nodes) Update(nodeID string, res *data.ResponseData) *Node {
 	if node == nil {
 		node = &Node{
 			Firstseen: now,
-			Flags: &meshviewer.Flags{
-				Online:  true,
-				Gateway: false,
-			},
 		}
 		nodes.List[nodeID] = node
 	}
 	nodes.Unlock()
 
 	node.Lastseen = now
-
-	if node.Flags != nil {
 	node.Flags.Online = true
-	}
 
 	// Update neighbours
 	if val := res.Neighbours; val != nil {
@@ -174,12 +167,10 @@ func (nodes *Nodes) expire() {
 			delete(nodes.List, id)
 		} else if node.Lastseen.Before(offlineTime) {
 			// set to offline
-			if node.Flags != nil {
 			node.Flags.Online = false
 		}
 	}
 }
-}
 
 func (nodes *Nodes) save() {
 	// Locking foo