first commit
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3
assets/app.css
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3
assets/app.css
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.loading {
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cursor: progress;
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}
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23
assets/app.js
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23
assets/app.js
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$(function() {
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$("#nodeTable tr[data-node]").each(function(){
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var $this = $(this);
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var node = $this.data("node");
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$.getJSON("/status/"+node, function (data) {
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$this.find("span.loading").hide();
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var label;
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if (data["Status"] === "UP") {
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label = "label-success";
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$this.addClass("success");
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$this.find("td.ping").text(data["Ping"] + "ms");
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} else if (data["Status"] === "SLOW") {
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label = "label-warning";
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$this.addClass("warning");
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$this.find("td.ping").text(data["Ping"] + "ms");
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} else {
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label = "label-danger";
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$this.addClass("danger");
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}
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$this.find("span.status").addClass(label).text(data["Status"]);
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})
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});
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})
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37
html/index.html
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37
html/index.html
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<!DOCTYPE html>
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<html>
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<head>
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<title>{{.Title}}</title>
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<meta charset="utf-8" />
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<link href="//netdna.bootstrapcdn.com/bootstrap/3.0.0/css/bootstrap.min.css" rel="stylesheet">
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<link href="//netdna.bootstrapcdn.com/font-awesome/3.2.1/css/font-awesome.min.css" rel="stylesheet">
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<script src="//ajax.googleapis.com/ajax/libs/jquery/1.10.2/jquery.min.js" type="text/javascript"></script>
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<script src="//netdna.bootstrapcdn.com/bootstrap/3.0.0/js/bootstrap.min.js" type="text/javascript"></script>
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<script src="/assets/app.js" type="text/javascript" charset="utf-8"></script>
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<link rel="stylesheet" type="text/css" href="/assets/app.css">
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</head>
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<body>
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<div class="panel panel-default">
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<!-- Default panel contents -->
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<div class="panel-heading">{{.Title}}</div>
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<table class="table" id="nodeTable">
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<tr>
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<th>Host</th>
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<th>Status</th>
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<th>Ping</th>
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</tr>
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{{range $node := .Nodes}}
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<tr data-node="{{$node}}">
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<td class="host">{{$node}}</td>
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<td>
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<span class="loading"><i class="icon-spinner icon-spin"></i>Loading...</span>
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<span class="status label"></span>
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</td>
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<td class="ping">
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-
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</td>
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</tr>
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{{end}}
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</table>
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</div>
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</body>
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1
nodes.json
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1
nodes.json
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["matchbox.vpn", "turingmachine.vpn", "higgsboson.vpn", "devkid-router.vpn", "devkid-desktop.vpn", "devkid-server.vpn", "devkid-nas.vpn"]
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111
server.go
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111
server.go
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@ -0,0 +1,111 @@
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package main
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import (
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"fmt"
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"net/http"
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"html/template"
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"os/exec"
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"os"
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"regexp"
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"strconv"
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"bytes"
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"encoding/json"
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)
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var indexTemplate = template.Must(template.ParseFiles("html/index.html"))
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var nodeList = []string{"higgsboson.vpn","turingmachine.vpn"}
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func stringInSlice(a string, list []string) bool {
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for _, b := range list {
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if b == a {
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return true
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}
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}
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return false
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}
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type IndexPage struct {
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Title string
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Nodes []string
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}
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type Status int
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const (
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On Status = iota
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Off
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Slow
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)
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func indexHandler(w http.ResponseWriter, r *http.Request) {
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indexTemplate.Execute(w, &IndexPage{Title: "VPN Node Status", Nodes: nodeList})
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}
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func ping(node string) (int64) {
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cmd := exec.Command("fping", "-e", node)
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var out bytes.Buffer
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cmd.Stdout = &out
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err := cmd.Run()
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if err == nil {
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match := regexp.MustCompile("\\d+").Find(out.Bytes())
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if (match != nil) {
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time, _ := strconv.ParseInt(string(match), 10, 0);
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return time;
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}
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return -1
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} else {
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return -1
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}
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}
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type NodeStatus struct {
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Domain string
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Status string
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Ping int64
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}
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const lenPath = len("/status/")
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func statusHandler(w http.ResponseWriter, r *http.Request) {
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node := r.URL.Path[lenPath:];
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if ! stringInSlice(node, nodeList) {
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w.WriteHeader(http.StatusNotFound)
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} else {
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var state string
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elapsed := ping(node);
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if elapsed == -1 {
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state = "DOWN"
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} else if elapsed > 200 {
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state = "SLOW"
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} else {
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state = "UP"
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}
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status := &NodeStatus{Domain: node, Status: state, Ping: elapsed}
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s, err := json.Marshal(status)
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if err != nil {
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w.WriteHeader(http.StatusInternalServerError)
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fmt.Printf("error while serializing json %s", err)
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} else {
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w.Write(s)
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}
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}
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}
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func main() {
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config, err := os.Open("./nodes.json")
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if err != nil {
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fmt.Printf("Cannot open nodes.json: '%s'", err)
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os.Exit(1);
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}
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jsonParser := json.NewDecoder(config)
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if err = jsonParser.Decode(&nodeList); err != nil {
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fmt.Printf("parsing config file: '%s'", err.Error())
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os.Exit(1);
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}
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http.HandleFunc("/status/", statusHandler)
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http.Handle("/assets/", http.StripPrefix("/assets", http.FileServer(http.Dir("./assets/"))))
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http.HandleFunc("/", indexHandler)
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http.ListenAndServe(":8080", nil)
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fmt.Printf("Running on 8080")
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}
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