yanic/runtime/nodes.go

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package runtime
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import (
"encoding/json"
"log"
"os"
"sync"
"time"
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"github.com/FreifunkBremen/yanic/data"
"github.com/FreifunkBremen/yanic/jsontime"
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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.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
}
// 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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// Select selects a list of nodes to be returned
func (nodes *Nodes) Select(f func(*Node) bool) []*Node {
nodes.RLock()
defer nodes.RUnlock()
result := make([]*Node, 0, len(nodes.List))
for _, node := range nodes.List {
if f(node) {
result = append(result, node)
}
}
return result
}
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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.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
SaveJSON(nodes, nodes.config.Nodes.StatePath)
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}
// SaveJSON to path
func SaveJSON(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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}