init

announced.go

@@ -0,0 +1,32 @@
+package main
+import (
+	"time"
+)
+
+type Announced struct {
+	NodeServer	*NodeServer
+	nodes           *Nodes
+	outputFile      string
+	collectInterval time.Duration
+	saveInterval    time.Duration
+	collectors	[]*Collector
+}
+
+func NewAnnounced(ns NodeServer) *Announced {
+	collects := []*Collector{
+		NewCollector("statistics"),
+		NewCollector("nodeinfo"),
+		NewCollector("neighbours"),
+	}
+	return &Announced{
+		ns,
+		NewNodes(),
+		output,
+		time.Second * time.Duration(15),
+		time.Second * time.Duration(15),
+		collects,
+	}
+}
+func (announced *Announced) Run() {
+
+}

collector.go

@@ -73,7 +73,9 @@ func (coll *Collector) sendOnce() {
 
 func (coll *Collector) sendPacket(address string) {
 	addr, err := net.ResolveUDPAddr("udp", address)
-	check(err)
+	if err != nil {
+		log.Panic(err)
+	}
 
 	coll.connection.WriteToUDP([]byte(coll.collectType), addr)
 }

main.go

@@ -1,51 +1,19 @@
 package main
 
 import (
-	"flag"
 	"log"
-	"os"
+	"net/http"
-	"os/signal"
-	"syscall"
-	"time"
-)
-
-var (
-	nodes           = NewNodes()
-	outputFile      string
-	collectInterval time.Duration
-	saveInterval    time.Duration
 )
 
 func main(){
-	var collectSeconds, saveSeconds int
+	node := NewNodeServer("/nodes")
+	go node.Listen()
 	
-	flag.StringVar(&outputFile, "output", "nodes.json", "path output file")
+	annouced := NewAnnouced(node)
-	flag.IntVar(&collectSeconds, "collectInterval", 15, "interval for data collections")
+	go annouced.Run()
-	flag.IntVar(&saveSeconds, "saveInterval", 5, "interval for data saving")
-	flag.Parse()
 
-	collectInterval = time.Second * time.Duration(collectSeconds)
+	// static files
-	saveInterval = time.Second * time.Duration(saveSeconds)
+	http.Handle("/", http.FileServer(http.Dir("webroot")))
 
-	collectors := []*Collector{
+	log.Fatal(http.ListenAndServe(":8080", nil))
-		NewCollector("statistics"),
-		NewCollector("nodeinfo"),
-		NewCollector("neighbours"),
-	}
-
-	// Wait for SIGINT or SIGTERM
-	sigs := make(chan os.Signal, 1)
-	signal.Notify(sigs, syscall.SIGINT, syscall.SIGTERM)
-	sig := <-sigs
-	log.Println("received", sig)
-
-	for _, c := range collectors {
-		c.Close()
-	}
-}
-
-func check(e error) {
-	if e != nil {
-		log.Panic(e)
-	}
 }

nodeclient.go

@@ -0,0 +1,82 @@
+package main
+
+import (
+	"fmt"
+	"log"
+
+	"golang.org/x/net/websocket"
+)
+
+const channelBufSize = 100
+
+var maxId int = 0
+
+// Node client.
+type NodeClient struct {
+	id     int
+	ws     *websocket.Conn
+	server *NodeServer
+	ch     chan *Node
+	doneCh chan bool
+}
+
+// Create new node client.
+func NewNodeClient(ws *websocket.Conn, server *NodeServer) *NodeClient {
+
+	if ws == nil {
+		panic("ws cannot be nil")
+	}
+
+	if server == nil {
+		panic("server cannot be nil")
+	}
+
+	maxId++
+	ch := make(chan *Node, channelBufSize)
+	doneCh := make(chan bool)
+
+	return &NodeClient{maxId, ws, server, ch, doneCh}
+}
+
+func (c *NodeClient) Conn() *websocket.Conn {
+	return c.ws
+}
+
+func (c *NodeClient) Write(node *Node) {
+	select {
+	case c.ch <- node:
+	default:
+		c.server.Del(c)
+		err := fmt.Errorf("NodeClient %d is disconnected.", c.id)
+		c.server.Err(err)
+	}
+}
+
+func (c *NodeClient) Done() {
+	c.doneCh <- true
+}
+
+// Listen Write and Read request via chanel
+func (c *NodeClient) Listen() {
+	go c.listenWrite()
+}
+
+// Listen write request via chanel
+func (c *NodeClient) listenWrite() {
+	log.Println("Listening write to NodeClient")
+	for {
+		select {
+
+		// send message to the client
+		case node := <-c.ch:
+			log.Println("Send:", node)
+			websocket.JSON.Send(c.ws, node)
+
+		// receive done request
+		case <-c.doneCh:
+			c.server.Del(c)
+			c.doneCh <- true // for listenRead method
+			return
+		}
+	}
+}

nodes.go

@@ -69,7 +69,9 @@ func (nodes *Nodes) save() {
 	data, err := json.Marshal(nodes)
 	nodes.Unlock()
 
-	check(err)
+	if err !=nil{
+		log.Panic(e)
+	}
 	log.Println("saving", len(nodes.List), "nodes")
 
 	tmpFile := outputFile + ".tmp"

nodeserver.go

@@ -0,0 +1,115 @@
+package main
+
+import (
+	"log"
+	"net/http"
+
+	"golang.org/x/net/websocket"
+)
+
+// Node server.
+type NodeServer struct {
+	pattern   string
+	clients   map[int]*NodeClient
+	addCh     chan *NodeClient
+	delCh     chan *NodeClient
+	sendAllCh chan *Node
+	doneCh    chan bool
+	errCh     chan error
+}
+
+// Create new node server.
+func NewNodeServer(pattern string) *NodeServer {
+	clients := make(map[int]*NodeClient)
+	addCh := make(chan *NodeClient)
+	delCh := make(chan *NodeClient)
+	sendAllCh := make(chan *Node)
+	doneCh := make(chan bool)
+	errCh := make(chan error)
+
+	return &NodeServer{
+		pattern,
+		clients,
+		addCh,
+		delCh,
+		sendAllCh,
+		doneCh,
+		errCh,
+	}
+}
+
+func (s *NodeServer) Add(c *NodeClient) {
+	s.addCh <- c
+}
+
+func (s *NodeServer) Del(c *NodeClient) {
+	s.delCh <- c
+}
+
+func (s *NodeServer) SendAll(node *Node) {
+	s.sendAllCh <- node
+}
+
+func (s *NodeServer) Done() {
+	s.doneCh <- true
+}
+
+func (s *NodeServer) Err(err error) {
+	s.errCh <- err
+}
+
+func (s *NodeServer) sendAll(node *Node) {
+	for _, c := range s.clients {
+		c.Write(node)
+	}
+}
+
+// Listen and serve.
+// It serves client connection and broadcast request.
+func (s *NodeServer) Listen() {
+
+	log.Println("Listening NodeServer...")
+
+	// websocket handler
+	onConnected := func(ws *websocket.Conn) {
+		defer func() {
+			err := ws.Close()
+			if err != nil {
+				s.errCh <- err
+			}
+		}()
+
+		client := NewNodeClient(ws, s)
+		s.Add(client)
+		client.Listen()
+	}
+	http.Handle(s.pattern, websocket.Handler(onConnected))
+	log.Println("Created handler")
+
+	for {
+		select {
+
+		// Add new a client
+		case c := <-s.addCh:
+			log.Println("Added new client")
+			s.clients[c.id] = c
+			log.Println("Now", len(s.clients), "clients connected.")
+
+		// del a client
+		case c := <-s.delCh:
+			log.Println("Delete client")
+			delete(s.clients, c.id)
+
+		// broadcast message for all clients
+		case node := <-s.sendAllCh:
+			log.Println("Send all:", node)
+			s.sendAll(node)
+
+		case err := <-s.errCh:
+			log.Println("Error:", err.Error())
+
+		case <-s.doneCh:
+			return
+		}
+	}
+}