yanic/respond/collector.go

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package respond
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import (
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"bytes"
"compress/flate"
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"encoding/json"
"fmt"
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"log"
"net"
"time"
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"github.com/FreifunkBremen/yanic/data"
"github.com/FreifunkBremen/yanic/database"
"github.com/FreifunkBremen/yanic/jsontime"
"github.com/FreifunkBremen/yanic/runtime"
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)
// Collector for a specificle respond messages
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type Collector struct {
connection *net.UDPConn // UDP socket
queue chan *Response // received responses
iface string
db database.Connection
nodes *runtime.Nodes
interval time.Duration // Interval for multicast packets
stop chan interface{}
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}
// NewCollector creates a Collector struct
func NewCollector(db database.Connection, nodes *runtime.Nodes, iface string, port int) *Collector {
linkLocalAddr, err := getLinkLocalAddr(iface)
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if err != nil {
log.Panic(err)
}
// Open socket
conn, err := net.ListenUDP("udp", &net.UDPAddr{
IP: linkLocalAddr,
Port: port,
Zone: iface,
})
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if err != nil {
log.Panic(err)
}
conn.SetReadBuffer(maxDataGramSize)
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collector := &Collector{
connection: conn,
db: db,
nodes: nodes,
iface: iface,
queue: make(chan *Response, 400),
stop: make(chan interface{}),
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}
go collector.receiver()
go collector.parser()
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if collector.db != nil {
go collector.globalStatsWorker()
}
return collector
}
// Returns the first link local unicast address for the given interface name
func getLinkLocalAddr(ifname string) (net.IP, error) {
iface, err := net.InterfaceByName(ifname)
if err != nil {
return nil, err
}
addresses, err := iface.Addrs()
if err != nil {
return nil, err
}
for _, addr := range addresses {
if ipnet := addr.(*net.IPNet); ipnet.IP.IsLinkLocalUnicast() {
return ipnet.IP, nil
}
}
return nil, fmt.Errorf("unable to find link local unicast address for %s", ifname)
}
// Start Collector
func (coll *Collector) Start(interval time.Duration) {
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if coll.interval != 0 {
panic("already started")
}
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if interval <= 0 {
panic("invalid collector interval")
}
coll.interval = interval
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go func() {
coll.sendOnce() // immediately
coll.sender() // periodically
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}()
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}
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// Close Collector
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func (coll *Collector) Close() {
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close(coll.stop)
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coll.connection.Close()
close(coll.queue)
}
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func (coll *Collector) sendOnce() {
now := jsontime.Now()
coll.sendMulticast()
// Wait for the multicast responses to be processed and send unicasts
time.Sleep(coll.interval / 2)
coll.sendUnicasts(now)
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}
func (coll *Collector) sendMulticast() {
log.Println("sending multicast")
coll.SendPacket(net.ParseIP(multiCastGroup))
}
// Send unicast packets to nodes that did not answer the multicast
func (coll *Collector) sendUnicasts(seenBefore jsontime.Time) {
seenAfter := seenBefore.Add(-time.Minute * 10)
// Select online nodes that has not been seen recently
nodes := coll.nodes.Select(func(n *runtime.Node) bool {
return n.Lastseen.After(seenAfter) && n.Lastseen.Before(seenBefore) && n.Address != nil
})
// Send unicast packets
log.Printf("sending unicast to %d nodes", len(nodes))
for _, node := range nodes {
coll.SendPacket(node.Address)
time.Sleep(10 * time.Millisecond)
}
}
// SendPacket sends a UDP request to the given unicast or multicast address
func (coll *Collector) SendPacket(address net.IP) {
addr := net.UDPAddr{
IP: address,
Port: port,
Zone: coll.iface,
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}
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if _, err := coll.connection.WriteToUDP([]byte("GET nodeinfo statistics neighbours"), &addr); err != nil {
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log.Println("WriteToUDP failed:", err)
}
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}
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// send packets continously
func (coll *Collector) sender() {
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ticker := time.NewTicker(coll.interval)
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for {
select {
case <-coll.stop:
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ticker.Stop()
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return
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case <-ticker.C:
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// send the multicast packet to request per-node statistics
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coll.sendOnce()
}
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}
}
func (coll *Collector) parser() {
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for obj := range coll.queue {
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if data, err := obj.parse(); err != nil {
log.Println("unable to decode response from", obj.Address.String(), err, "\n", string(obj.Raw))
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} else {
coll.saveResponse(obj.Address, data)
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}
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}
}
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func (res *Response) parse() (*data.ResponseData, error) {
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// Deflate
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deflater := flate.NewReader(bytes.NewReader(res.Raw))
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defer deflater.Close()
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// Unmarshal
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rdata := &data.ResponseData{}
err := json.NewDecoder(deflater).Decode(rdata)
return rdata, err
}
func (coll *Collector) saveResponse(addr net.UDPAddr, res *data.ResponseData) {
// Search for NodeID
var nodeID string
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if val := res.NodeInfo; val != nil {
nodeID = val.NodeID
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} else if val := res.Neighbours; val != nil {
nodeID = val.NodeID
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} else if val := res.Statistics; val != nil {
nodeID = val.NodeID
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}
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// Check length of nodeID
if len(nodeID) != 12 {
log.Printf("invalid NodeID '%s' from %s", nodeID, addr.String())
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return
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}
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// Set fields to nil if nodeID is inconsistent
if res.Statistics != nil && res.Statistics.NodeID != nodeID {
res.Statistics = nil
}
if res.Neighbours != nil && res.Neighbours.NodeID != nodeID {
res.Neighbours = nil
}
if res.NodeInfo != nil && res.NodeInfo.NodeID != nodeID {
res.NodeInfo = nil
}
// Process the data and update IP address
node := coll.nodes.Update(nodeID, res)
node.Address = addr.IP
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// Store statistics in database
if db := coll.db; db != nil {
db.InsertNode(node)
// Store link data
if neighbours := node.Neighbours; neighbours != nil {
for _, link := range coll.nodes.NodeLinks(node) {
db.InsertLink(&link, node.Lastseen.GetTime())
}
}
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}
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}
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func (coll *Collector) receiver() {
buf := make([]byte, maxDataGramSize)
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for {
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n, src, err := coll.connection.ReadFromUDP(buf)
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if err != nil {
log.Println("ReadFromUDP failed:", err)
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return
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}
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raw := make([]byte, n)
copy(raw, buf)
coll.queue <- &Response{
Address: *src,
Raw: raw,
}
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}
}
func (coll *Collector) globalStatsWorker() {
ticker := time.NewTicker(time.Minute)
for {
select {
case <-coll.stop:
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ticker.Stop()
return
case <-ticker.C:
coll.saveGlobalStats()
}
}
}
// saves global statistics
func (coll *Collector) saveGlobalStats() {
stats := runtime.NewGlobalStats(coll.nodes)
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coll.db.InsertGlobals(stats, time.Now())
}