2023-08-16 10:25:41 +00:00
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package main
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import (
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2023-08-18 02:01:35 +00:00
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"bufio"
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2023-08-16 10:25:41 +00:00
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"bytes"
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_ "embed"
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"encoding/json"
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2023-08-16 10:25:41 +00:00
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"fmt"
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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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"os/signal"
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"strings"
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"sync"
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"syscall"
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"text/template"
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"time"
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)
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//go:embed index.html
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var tmpl string
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var report = template.Must(template.New("").Parse(tmpl))
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var write_report chan bool
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var interval = time.Second * 2
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var wr sync.Mutex
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type Network struct {
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Name string
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IP string
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OnFail string
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}
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var Networks = []*Network{
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{
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Name: "DSL",
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IP: "220.135.85.67",
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OnFail: "nmcli connection up DSL",
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},
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{
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Name: "Asus",
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IP: "192.168.50.48",
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},
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}
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func main() {
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write_report = make(chan bool, 1)
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file, err := os.OpenFile("network.log", os.O_WRONLY|os.O_APPEND|os.O_CREATE, os.ModePerm)
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if err != nil {
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log.Panicln(err)
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}
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defer file.Close()
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log.Println("starting network monitor")
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go func() {
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perr := false
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derr := false
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for reducer := 0; ; reducer++ {
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now := time.Now().Format("2006-01-02 15:04:05")
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// Public
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go func(print bool) {
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_, err = net.LookupIP("google.com")
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if err != nil {
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if !perr {
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perr = true
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log.Println(err)
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}
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wr.Lock()
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fmt.Fprintf(file, `{"x": "%s", "y": "%s", "name": "%s"},`, now, "failed", "Public")
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fmt.Fprintf(file, "\n")
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wr.Unlock()
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} else {
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perr = false
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if print {
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wr.Lock()
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fmt.Fprintf(file, `{"x": "%s", "y": "%s", "name": "%s"},`, now, "ok", "Public")
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fmt.Fprintf(file, "\n")
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wr.Unlock()
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}
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}
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}(reducer == 0)
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// devices
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go func(print bool) {
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for i := range Networks {
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_, err = GetOutboundIP(Networks[i].IP + ":0")
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if err != nil {
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if !derr {
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derr = true
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log.Println(err)
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}
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wr.Lock()
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fmt.Fprintf(file, `{"x": "%s", "y": "%s", "name": "%s"},`, now, "failed", Networks[i].Name)
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fmt.Fprintf(file, "\n")
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wr.Unlock()
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// fmt.Fprintf(file, "%s\t%s\t%s\n", now, Networks[i].Name, "failed")
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} else {
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derr = false
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if print {
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wr.Lock()
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fmt.Fprintf(file, `{"x": "%s", "y": "%s", "name": "%s"},`, now, "ok", Networks[i].Name)
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fmt.Fprintf(file, "\n")
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wr.Unlock()
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}
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}
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}
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}(reducer == 0)
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<-time.After(interval)
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if reducer >= 9 {
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reducer = -1
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}
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}
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}()
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go func() {
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for {
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<-time.After(time.Minute * 5)
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CleanLog(false)
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WriteReport()
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}
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}()
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go func() {
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http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
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http.ServeFile(w, r, strings.TrimPrefix(r.URL.Path, "/"))
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})
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port, ok := os.LookupEnv("PORT")
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if !ok {
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port = "1080"
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}
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if err := http.ListenAndServe("0.0.0.0:"+port, nil); err != nil {
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log.Fatalln(err)
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}
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}()
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wait := make(chan os.Signal, 1)
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signal.Notify(wait, syscall.SIGINT, syscall.SIGTERM)
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<-wait
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CleanLog(true)
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WriteReport()
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}
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func WriteReport() {
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select {
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case write_report <- true:
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default:
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return
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}
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defer func() { <-write_report }()
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f, err := os.OpenFile("report.html", os.O_WRONLY|os.O_CREATE|os.O_TRUNC, os.ModePerm)
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if err != nil {
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log.Println(err)
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return
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}
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defer f.Close()
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wr.Lock()
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data, err := os.ReadFile("network.log")
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wr.Unlock()
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if err != nil {
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log.Println(err)
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return
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}
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content := &bytes.Buffer{}
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if err = report.Execute(content, map[string]string{"Data": string(data)}); err != nil {
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log.Println(err)
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return
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}
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content.WriteTo(f)
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}
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type point struct {
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Time string `json:"x"`
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Stat string `json:"y"`
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Name string `json:"name"`
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}
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func (p point) GetTime() time.Time {
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t, _ := time.Parse("2006-01-02 15:04:05", p.Time)
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return t
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}
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2023-08-18 02:34:20 +00:00
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func CleanLog(down bool) error {
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file, err := os.OpenFile("network.log", os.O_RDONLY|os.O_CREATE, os.ModePerm)
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if err != nil {
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log.Println(err)
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return err
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}
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last := map[string]*point{}
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end := map[string]*point{}
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queue := []*point{}
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scanner := bufio.NewScanner(file)
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for scanner.Scan() {
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pt := &point{}
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data := scanner.Bytes()
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err = json.Unmarshal(data[:len(data)-1], pt)
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if err != nil {
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log.Println(err)
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file.Close()
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return err
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}
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last_pt, ok := last[pt.Name]
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if !ok {
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last[pt.Name] = pt
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queue = append(queue, pt)
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} else {
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if last_pt.Stat != pt.Stat {
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last[pt.Name] = pt
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if pre_last, ok := end[pt.Name]; ok {
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queue = append(queue, pre_last)
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}
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queue = append(queue, pt)
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}
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}
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end[pt.Name] = pt
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2023-08-18 02:01:35 +00:00
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}
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if err := scanner.Err(); err != nil {
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log.Println(err)
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return err
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}
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file.Close()
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for k, v := range end {
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if pt, ok := last[k]; ok {
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if pt.Time != v.Time {
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queue = append(queue, v)
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}
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}
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}
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2023-08-18 02:34:20 +00:00
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// if down {
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// now := time.Now().Format("2006-01-02 15:04:05")
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// for pt := range end {
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// queue = append(queue, &point{
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// Time: now,
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// Stat: "down",
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// Name: pt,
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// })
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// }
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// }
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2023-08-18 02:01:35 +00:00
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wr.Lock()
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defer wr.Unlock()
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file, err = os.OpenFile("network.log", os.O_WRONLY|os.O_TRUNC, os.ModePerm)
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if err != nil {
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log.Println(err)
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return err
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}
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defer file.Close()
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for i := range queue {
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b, err := json.Marshal(queue[i])
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if err != nil {
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log.Println(err)
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return err
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}
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file.Write(b)
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file.Write([]byte{',', '\n'})
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}
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return nil
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}
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2023-08-16 10:25:41 +00:00
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// Get preferred outbound ip of this machine
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func GetOutboundIP(addr string) (net.IP, error) {
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iface, err := net.ResolveUDPAddr("udp", addr)
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if err != nil {
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return nil, err
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}
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dialer := &net.Dialer{LocalAddr: iface}
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conn, err := dialer.Dial("udp", "8.8.8.8:80")
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if err != nil {
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return nil, err
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}
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defer conn.Close()
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localAddr := conn.LocalAddr().(*net.UDPAddr)
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return localAddr.IP, nil
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}
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