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main.go
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package main
import (
"flag"
"html/template"
"log"
"net/http"
"os"
"github.com/gorilla/websocket"
)
// based on:
// https://github.com/gorilla/websocket/tree/master/examples/echo
var addr = flag.String("addr", "0.0.0.0", "http service address")
var port = flag.String("port", "80", "http service port")
var upgrader = websocket.Upgrader{} // use default options
var logger = log.New(os.Stdout, "server ", log.LstdFlags|log.Lshortfile|log.Ltime|log.LUTC)
func main() {
flag.Parse()
http.HandleFunc("/echo", echo)
http.HandleFunc("/", home)
http.HandleFunc("/hc", hc)
logger.Println("Server is ready to handle requests at port", *port)
logger.Fatal(http.ListenAndServe(*addr+":"+*port, nil))
}
func echo(w http.ResponseWriter, r *http.Request) {
c, err := upgrader.Upgrade(w, r, nil)
if err != nil {
logger.Print("upgrade:", err)
return
}
defer c.Close()
for {
mt, message, err := c.ReadMessage()
if err != nil {
logger.Println("read:", err)
break
}
logger.Printf("recv: %s", message)
err = c.WriteMessage(mt, message)
if err != nil {
logger.Println("write:", err)
break
}
}
}
func home(w http.ResponseWriter, r *http.Request) {
logger.Printf("home endpoint: %s", r.Method)
homeTemplate.Execute(w, "ws://"+r.Host+"/echo")
}
func hc(w http.ResponseWriter, r *http.Request) {
logger.Printf("hc endpoint: %s", r.Method)
_, err := w.Write([]byte("ok"))
if err != nil {
logger.Println("Error writing response:", err)
}
}
var homeTemplate = template.Must(template.New("").Parse(`
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>GoWebSocket</title>
<script>
window.addEventListener("load", function(evt) {
var output = document.getElementById("output");
var input = document.getElementById("input");
var ws;
var print = function(message) {
var d = document.createElement("div");
d.textContent = message;
output.appendChild(d);
output.scroll(0, output.scrollHeight);
};
document.getElementById("open").onclick = function(evt) {
if (ws) {
return false;
}
ws = new WebSocket("{{.}}");
ws.onopen = function(evt) {
print("OPEN");
}
ws.onclose = function(evt) {
print("CLOSE");
ws = null;
}
ws.onmessage = function(evt) {
print("RESPONSE: " + evt.data);
}
ws.onerror = function(evt) {
print("ERROR: " + evt.data);
}
return false;
};
document.getElementById("send").onclick = function(evt) {
if (!ws) {
return false;
}
print("SEND: " + input.value);
ws.send(input.value);
return false;
};
document.getElementById("close").onclick = function(evt) {
if (!ws) {
return false;
}
ws.close();
return false;
};
});
</script>
</head>
<body>
<table>
<tr><td valign="top" width="50%">
<p>Click "Open" to create a connection to the server,
"Send" to send a message to the server and "Close" to close the connection.
You can change the message and send multiple times.
<p>
<form>
<button id="open">Open</button>
<button id="close">Close</button>
<p><input id="input" type="text" value="Hello world!">
<button id="send">Send</button>
</form>
</td><td valign="top" width="50%">
<div id="output" style="max-height: 70vh;overflow-y: scroll;"></div>
</td></tr></table>
</body>
</html>
`))