Export multiple versions of JSON for different Meshviewers (#16)

* multi json output format
* fix memory usage in older JSON
* meshviewer versions add detailed comments
* some beautiful fixes in modes/nodes

meshviewer/meshviewer.go

@@ -1,8 +1,6 @@
 package meshviewer
 
 import (
-	"sync"
-
 	"github.com/FreifunkBremen/respond-collector/data"
 	"github.com/FreifunkBremen/respond-collector/jsontime"
 )
@@ -22,12 +20,20 @@ type Flags struct {
 	Gateway bool `json:"gateway"`
 }
 
-// Nodes struct: cache DB of Node's structs
-type Nodes struct {
+// NodesV1 struct, to support legacy meshviewer (which are in master branch)
+//  i.e. https://github.com/ffnord/meshviewer/tree/master
+type NodesV1 struct {
 	Version   int              `json:"version"`
 	Timestamp jsontime.Time    `json:"timestamp"`
 	List      map[string]*Node `json:"nodes"` // the current nodemap, indexed by node ID
-	sync.RWMutex
+}
+
+// NodesV2 struct, to support new version of meshviewer (which are in legacy develop branch or newer)
+//  i.e. https://github.com/ffnord/meshviewer/tree/dev or https://github.com/ffrgb/meshviewer/tree/develop
+type NodesV2 struct {
+	Version   int           `json:"version"`
+	Timestamp jsontime.Time `json:"timestamp"`
+	List      []*Node       `json:"nodes"` // the current nodemap, as array
 }
 
 type Statistics struct {
@@ -35,7 +41,7 @@ type Statistics struct {
 	Clients     uint32  `json:"clients"`
 	RootFsUsage float64 `json:"rootfs_usage,omitempty"`
 	LoadAverage float64 `json:"loadavg,omitempty"`
-	Memory      data.Memory `json:"memory,omitempty"`
+	MemoryUsage float64 `json:"memory_usage,omitempty"`
 	Uptime      float64 `json:"uptime,omitempty"`
 	Idletime    float64 `json:"idletime,omitempty"`
 	Gateway     string  `json:"gateway,omitempty"`
@@ -52,3 +58,28 @@ type Statistics struct {
 		MgmtRx  *data.Traffic `json:"mgmt_rx"`
 	} `json:"traffic,omitempty"`
 }
+
+func NewStatistics(stats *data.Statistics) *Statistics {
+	total := stats.Clients.Total
+	if total == 0 {
+		total = stats.Clients.Wifi24 + stats.Clients.Wifi5
+	}
+	/* The Meshviewer could not handle absolute memory output
+         * calc the used memory as a float witch 100% equal 1.0
+         */
+	memoryUsage := (float64(stats.Memory.Total) - float64(stats.Memory.Free)) / float64(stats.Memory.Total)
+
+	return &Statistics{
+		NodeId:      stats.NodeId,
+		Gateway:     stats.Gateway,
+		RootFsUsage: stats.RootFsUsage,
+		LoadAverage: stats.LoadAverage,
+		MemoryUsage: memoryUsage,
+		Uptime:      stats.Uptime,
+		Idletime:    stats.Idletime,
+		Processes:   stats.Processes,
+		MeshVpn:     stats.MeshVpn,
+		Traffic:     stats.Traffic,
+		Clients:     total,
+	}
+}

models/config.go

@@ -27,8 +27,9 @@ type Config struct {
 	} `yaml:"webserver"`
 	Nodes struct {
 		Enable           bool   `yaml:"enable"`
-		NodesPath     string `yaml:"nodes_path"`
-		NodesMiniPath string `yaml:"nodesmini_path"`
+		NodesDynamicPath string `yaml:"nodes_path"`
+		NodesV1Path      string `yaml:"nodesv1_path"`
+		NodesV2Path      string `yaml:"nodesv2_path"`
 		GraphsPath       string `yaml:"graphs_path"`
 		AliasesPath      string `yaml:"aliases_path"`
 		SaveInterval     int    `yaml:"saveinterval"` // Save nodes every n seconds

models/nodes.go

@@ -28,11 +28,14 @@ func NewNodes(config *Config) *Nodes {
 		config: config,
 	}
 
-	if config.Nodes.NodesPath != "" {
+	if config.Nodes.NodesDynamicPath != "" {
 		nodes.load()
 	}
-
-	nodes.Version = 2
+        /**
+         * Version '-1' because the nodes.json would not be defined,
+         * it would be change with the change of the respondd application on gluon
+         */
+	nodes.Version = -1
 	return nodes
 }
 
@@ -83,51 +86,53 @@ func (nodes *Nodes) Update(nodeID string, res *data.ResponseData) *Node {
 	return node
 }
 
-// GetNodesMini get meshviewer valide JSON
-func (nodes *Nodes) GetNodesMini() *meshviewer.Nodes {
-	meshviewerNodes := &meshviewer.Nodes{
+// GetNodesV1 transform data to legacy meshviewer
+func (nodes *Nodes) GetNodesV1() *meshviewer.NodesV1 {
+	meshviewerNodes := &meshviewer.NodesV1{
 		Version:   1,
 		List:      make(map[string]*meshviewer.Node),
 		Timestamp: nodes.Timestamp,
 	}
 
 	for nodeID := range nodes.List {
-		node, _ := meshviewerNodes.List[nodeID]
 		nodeOrigin := nodes.List[nodeID]
 
 		if nodeOrigin.Statistics == nil {
 			continue
 		}
 
-		if node == nil {
-			node = &meshviewer.Node{
+		node := &meshviewer.Node{
 			Firstseen: nodeOrigin.Firstseen,
 			Lastseen:  nodeOrigin.Lastseen,
 			Flags:     nodeOrigin.Flags,
 			Nodeinfo:  nodeOrigin.Nodeinfo,
 		}
+		node.Statistics = meshviewer.NewStatistics(nodeOrigin.Statistics)
 		meshviewerNodes.List[nodeID] = node
 	}
+	return meshviewerNodes
+}
 
-		// Calculate Total
-		total := nodeOrigin.Statistics.Clients.Total
-		if total == 0 {
-			total = nodeOrigin.Statistics.Clients.Wifi24 + nodeOrigin.Statistics.Clients.Wifi5
+// GetNodesV2 transform data to modern meshviewers
+func (nodes *Nodes) GetNodesV2() *meshviewer.NodesV2 {
+	meshviewerNodes := &meshviewer.NodesV2{
+		Version:   2,
+		Timestamp: nodes.Timestamp,
 	}
+	for nodeID := range nodes.List {
 
-		node.Statistics = &meshviewer.Statistics{
-			NodeId:      nodeOrigin.Statistics.NodeId,
-			Gateway:     nodeOrigin.Statistics.Gateway,
-			RootFsUsage: nodeOrigin.Statistics.RootFsUsage,
-			LoadAverage: nodeOrigin.Statistics.LoadAverage,
-			Memory:      nodeOrigin.Statistics.Memory,
-			Uptime:      nodeOrigin.Statistics.Uptime,
-			Idletime:    nodeOrigin.Statistics.Idletime,
-			Processes:   nodeOrigin.Statistics.Processes,
-			MeshVpn:     nodeOrigin.Statistics.MeshVpn,
-			Traffic:     nodeOrigin.Statistics.Traffic,
-			Clients:     total,
+		nodeOrigin := nodes.List[nodeID]
+		if nodeOrigin.Statistics == nil {
+			continue
 		}
+		node := &meshviewer.Node{
+			Firstseen: nodeOrigin.Firstseen,
+			Lastseen:  nodeOrigin.Lastseen,
+			Flags:     nodeOrigin.Flags,
+			Nodeinfo:  nodeOrigin.Nodeinfo,
+		}
+		node.Statistics = meshviewer.NewStatistics(nodeOrigin.Statistics)
+		meshviewerNodes.List = append(meshviewerNodes.List, node)
 	}
 	return meshviewerNodes
 }
@@ -172,9 +177,9 @@ func (nodes *Nodes) expire() {
 }
 
 func (nodes *Nodes) load() {
-	path := nodes.config.Nodes.NodesPath
+	path := nodes.config.Nodes.NodesDynamicPath
 
-	if f, err := os.Open(path); err == nil {
+	if f, err := os.Open(path); err == nil { // transform data to legacy meshviewer
 		if err := json.NewDecoder(f).Decode(nodes); err == nil {
 			log.Println("loaded", len(nodes.List), "nodes")
 		} else {
@@ -191,15 +196,19 @@ func (nodes *Nodes) save() {
 	defer nodes.RUnlock()
 
 	// serialize nodes
-	save(nodes, nodes.config.Nodes.NodesPath)
-	save(nodes.GetNodesMini(), nodes.config.Nodes.NodesMiniPath)
+	save(nodes, nodes.config.Nodes.NodesDynamicPath)
+	if path := nodes.config.Nodes.NodesV1Path; path != "" {
+		save(nodes.GetNodesV1(), path)
+	}
+	if path := nodes.config.Nodes.NodesV2Path; path != "" {
+		save(nodes.GetNodesV2(), path)
+	}
 
 	if path := nodes.config.Nodes.GraphsPath; path != "" {
 		save(nodes.BuildGraph(), path)
 	}
 }
 
-// Marshals the input and writes it into the given file
 func save(input interface{}, outputFile string) {
 	tmpFile := outputFile + ".tmp"
 

models/nodes_test.go

@@ -47,7 +47,7 @@ func TestLoadAndSave(t *testing.T) {
 	assert := assert.New(t)
 
 	config := &Config{}
-	config.Nodes.NodesPath = "testdata/nodes.json"
+	config.Nodes.NodesDynamicPath = "testdata/nodes.json"
 
 	nodes := NewNodes(config)
 	nodes.load()

models/stats_test.go

@@ -25,11 +25,17 @@ func TestGlobalStats(t *testing.T) {
 	assert.EqualValues(1, stats.Firmwares["2016.1.6+entenhausen1"])
 }
 
-func TestNodesMini(t *testing.T) {
-	mini := createTestNodes().GetNodesMini()
+func TestNodesV1(t *testing.T) {
+	nodes := createTestNodes().GetNodesV1()
 
 	assert := assert.New(t)
-	assert.Equal(2, len(mini.List))
+	assert.Equal(2, len(nodes.List))
+}
+func TestNodesV2(t *testing.T) {
+	nodes := createTestNodes().GetNodesV2()
+
+	assert := assert.New(t)
+	assert.Equal(2, len(nodes.List))
 }
 
 func createTestNodes() *Nodes {