initial working version
This commit is contained in:
commit
c511491229
232
server.go
Normal file
232
server.go
Normal file
@ -0,0 +1,232 @@
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package main
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import (
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"fmt"
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"github.com/gorilla/websocket"
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"github.com/tidwall/pretty"
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"html/template"
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"log"
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"net"
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"net/http"
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"os"
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)
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const (
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//CONN_HOST = "localhost"
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CONN_PORT = ":3010"
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CONN_TYPE = "tcp"
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)
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var upgrader = websocket.Upgrader{} // use default options
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func echo(channel <-chan string) func(w http.ResponseWriter, r *http.Request) {
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return func(w http.ResponseWriter, r *http.Request) {
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c, err := upgrader.Upgrade(w, r, nil)
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if err != nil {
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log.Print("upgrade:", err)
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return
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}
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defer c.Close()
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for {
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//mt, message, err := c.ReadMessage()
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//if err != nil {
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// log.Println("read:", err)
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// break
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//}
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//log.Printf("recv: %s", message)
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cmsg := <-channel
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err = c.WriteMessage(websocket.TextMessage, []byte(cmsg))
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if err != nil {
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log.Println("write:", err)
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break
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}
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}
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}
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}
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func home(w http.ResponseWriter, r *http.Request) {
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homeTemplate.Execute(w, "ws://"+r.Host+"/echo")
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}
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func main() {
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channel := make(chan string)
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switch CONN_TYPE {
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case "tcp":
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go tcp(channel)
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case "udp":
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go udp()
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}
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http.HandleFunc("/echo", echo(channel))
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http.HandleFunc("/", home)
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log.Fatal(http.ListenAndServe(":3011", nil))
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}
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func tcp(messageChannel chan<- string) {
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fmt.Println("Hello TCP")
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listener, err := net.Listen("tcp", CONN_PORT)
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if err != nil {
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fmt.Println("Error listening:", err.Error())
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os.Exit(1)
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}
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// Close the listener when the application closes.
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defer listener.Close()
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//messageChannel := make(chan string)
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for {
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// Listen for an incoming connection.
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conn, err := listener.Accept()
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if err != nil {
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fmt.Println("Error accepting: ", err.Error())
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os.Exit(1)
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}
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// Handle connections in a new goroutine.
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go handleRequest(conn, messageChannel)
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}
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}
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// Handles incoming requests.
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func handleRequest(conn net.Conn, messageChannel chan<- string) {
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defer conn.Close()
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// Make a buffer to hold incoming data.
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for {
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buf := make([]byte, 2048)
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// Read the incoming connection into the buffer.
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_, err := conn.Read(buf)
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if err != nil {
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fmt.Println("Error reading:", err.Error())
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break
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}
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json := buf
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json = pretty.Pretty(json)
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fmt.Println(string(json))
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messageChannel <- string(json)
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// Send a response back to person contacting us.
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// conn.Write([]byte("You stepped into my honey pot. I'll find you! "))
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conn.Write([]byte("success"))
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// Close the connection when you're done with it.
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}
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}
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func udp() {
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fmt.Println("Hello!")
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port := CONN_PORT
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protocol := "udp"
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//Build the address
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udpAddr, err := net.ResolveUDPAddr(protocol, port)
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if err != nil {
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fmt.Println("Wrong Address")
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return
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}
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//Output
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fmt.Println("Reading " + protocol + " from " + udpAddr.String())
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//Create the connection
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udpConn, err := net.ListenUDP(protocol, udpAddr)
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if err != nil {
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fmt.Println(err)
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}
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//Keep calling this function
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for {
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handlePacket(udpConn)
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}
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}
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func handlePacket(conn *net.UDPConn) {
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var buf = make([]byte, 2048)
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n, err := conn.Read(buf)
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fmt.Println("Buffersize:", n)
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if err != nil {
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fmt.Println("Error Reading")
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return
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} else {
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fmt.Println(string(buf))
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//fmt.Println(hex.EncodeToString(buf[0:n]))
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//fmt.Println("Package Done")
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}
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}
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var homeTemplate = template.Must(template.New("").Parse(`
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<!DOCTYPE html>
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<html>
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<head>
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<meta charset="utf-8">
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<script>
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window.addEventListener("load", function(evt) {
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var output = document.getElementById("output");
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var input = document.getElementById("input");
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var ws;
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var print = function(message) {
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var d = document.createElement("div");
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d.textContent = message;
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output.appendChild(d);
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};
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var print2 = function(message) {
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var d = document.createElement("p");
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d.innerText = message;
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oldNode = output.firstChild
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output.replaceChild(d, oldNode)
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};
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document.getElementById("open").onclick = function(evt) {
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if (ws) {
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return false;
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}
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ws = new WebSocket("{{.}}");
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ws.onopen = function(evt) {
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print("OPEN");
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}
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ws.onclose = function(evt) {
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print("CLOSE");
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ws = null;
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}
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ws.onmessage = function(evt) {
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print2("RESPONSE: " + evt.data);
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}
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ws.onerror = function(evt) {
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print("ERROR: " + evt.data);
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}
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return false;
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};
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document.getElementById("send").onclick = function(evt) {
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if (!ws) {
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return false;
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}
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print("SEND: " + input.value);
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ws.send(input.value);
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return false;
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};
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document.getElementById("close").onclick = function(evt) {
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if (!ws) {
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return false;
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}
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ws.close();
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return false;
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};
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});
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</script>
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</head>
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<body>
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<table>
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<tr><td valign="top" width="50%">
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<p>Click "Open" to create a connection to the server,
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"Send" to send a message to the server and "Close" to close the connection.
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You can change the message and send multiple times.
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<p>
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<form>
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<button id="open">Open</button>
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<button id="close">Close</button>
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<p><input id="input" type="text" value="Hello world!">
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<button id="send">Send</button>
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</form>
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</td><td valign="top" width="50%">
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<div id="output"></div>
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</td></tr></table>
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</body>
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</html>
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`))
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