yanic/models/nodes.go

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package models
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import (
"encoding/json"
"log"
"os"
"sync"
"time"
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"github.com/FreifunkBremen/respond-collector/data"
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"github.com/FreifunkBremen/respond-collector/jsontime"
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"github.com/FreifunkBremen/respond-collector/meshviewer"
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)
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// Nodes struct: cache DB of Node's structs
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type Nodes struct {
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List map[string]*Node `json:"nodes"` // the current nodemap, indexed by node ID
config *Config
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sync.RWMutex
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}
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// NewNodes create Nodes structs
func NewNodes(config *Config) *Nodes {
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nodes := &Nodes{
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List: make(map[string]*Node),
config: config,
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}
if config.Nodes.StatePath != "" {
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nodes.load()
}
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return nodes
}
//Start all services to manage Nodes
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func (nodes *Nodes) Start() {
go nodes.worker()
}
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// Update a Node
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func (nodes *Nodes) Update(nodeID string, res *data.ResponseData) *Node {
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now := jsontime.Now()
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nodes.Lock()
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node, _ := nodes.List[nodeID]
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if node == nil {
node = &Node{
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Firstseen: now,
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}
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nodes.List[nodeID] = node
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}
nodes.Unlock()
node.Lastseen = now
node.Flags.Online = true
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// Update neighbours
if val := res.Neighbours; val != nil {
node.Neighbours = val
}
// Update nodeinfo
if val := res.NodeInfo; val != nil {
node.Nodeinfo = val
node.Flags.Gateway = val.VPN
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}
// Update statistics
if val := res.Statistics; val != nil {
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// Update channel utilization if previous statistics are present
if node.Statistics != nil && node.Statistics.Wireless != nil && val.Wireless != nil {
val.Wireless.SetUtilization(node.Statistics.Wireless)
}
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node.Statistics = val
}
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return node
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}
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// GetNodesV1 transform data to legacy meshviewer
func (nodes *Nodes) GetNodesV1() *meshviewer.NodesV1 {
meshviewerNodes := &meshviewer.NodesV1{
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Version: 1,
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List: make(map[string]*meshviewer.Node),
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Timestamp: jsontime.Now(),
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}
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for nodeID := range nodes.List {
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nodeOrigin := nodes.List[nodeID]
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if nodeOrigin.Statistics == nil {
continue
}
node := &meshviewer.Node{
Firstseen: nodeOrigin.Firstseen,
Lastseen: nodeOrigin.Lastseen,
Flags: nodeOrigin.Flags,
Nodeinfo: nodeOrigin.Nodeinfo,
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}
node.Statistics = meshviewer.NewStatistics(nodeOrigin.Statistics)
meshviewerNodes.List[nodeID] = node
}
return meshviewerNodes
}
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// GetNodesV2 transform data to modern meshviewers
func (nodes *Nodes) GetNodesV2() *meshviewer.NodesV2 {
meshviewerNodes := &meshviewer.NodesV2{
Version: 2,
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Timestamp: jsontime.Now(),
}
for nodeID := range nodes.List {
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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)
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}
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return meshviewerNodes
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}
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// Periodically saves the cached DB to json file
func (nodes *Nodes) worker() {
c := time.Tick(nodes.config.Nodes.SaveInterval.Duration)
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for range c {
nodes.expire()
nodes.save()
}
}
// Expires nodes and set nodes offline
func (nodes *Nodes) expire() {
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now := jsontime.Now()
// Nodes last seen before expireAfter will be removed
prunePeriod := nodes.config.Nodes.PruneAfter.Duration
if prunePeriod == 0 {
prunePeriod = time.Hour * 24 * 7 // our default
}
pruneAfter := now.Add(-prunePeriod)
// Nodes last seen within OfflineAfter are changed to 'offline'
offlineAfter := now.Add(-nodes.config.Nodes.OfflineAfter.Duration)
// Locking foo
nodes.Lock()
defer nodes.Unlock()
for id, node := range nodes.List {
if node.Lastseen.Before(pruneAfter) {
// expire
delete(nodes.List, id)
} else if node.Lastseen.Before(offlineAfter) {
// set to offline
node.Flags.Online = false
}
}
}
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func (nodes *Nodes) load() {
path := nodes.config.Nodes.StatePath
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 {
log.Println("failed to unmarshal nodes:", err)
}
} else {
log.Println("failed to load cached nodes:", err)
}
}
func (nodes *Nodes) save() {
// Locking foo
nodes.RLock()
defer nodes.RUnlock()
// serialize nodes
save(nodes, nodes.config.Nodes.StatePath)
if path := nodes.config.Nodes.NodesPath; path != "" {
version := nodes.config.Nodes.NodesVersion
switch version {
case 1:
save(nodes.GetNodesV1(), path)
case 2:
save(nodes.GetNodesV2(), path)
default:
log.Panicf("invalid nodes version: %d", version)
}
}
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if path := nodes.config.Nodes.GraphPath; path != "" {
save(nodes.BuildGraph(), path)
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}
}
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func save(input interface{}, outputFile string) {
tmpFile := outputFile + ".tmp"
f, err := os.OpenFile(tmpFile, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0644)
if err != nil {
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log.Panic(err)
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}
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err = json.NewEncoder(f).Encode(input)
if err != nil {
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log.Panic(err)
}
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f.Close()
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if err := os.Rename(tmpFile, outputFile); err != nil {
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log.Panic(err)
}
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}