147 lines
2.6 KiB
Go
147 lines
2.6 KiB
Go
package main
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import (
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_ "embed"
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"flag"
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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/exec"
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"sort"
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"strings"
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"time"
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"tailscale.com/tsnet"
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)
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//go:embed generate_images.sh
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var genScript []byte
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//go:embed style.css
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var style string
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func main() {
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tmpDir, err := os.MkdirTemp("", "tsvnstat")
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if err != nil {
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log.Fatal(err)
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}
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defer os.RemoveAll(tmpDir)
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tmpFile, err := os.CreateTemp("", "generate_images.sh")
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if err != nil {
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log.Fatal(err)
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}
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defer os.Remove(tmpFile.Name())
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if _, err := tmpFile.Write(genScript); err != nil {
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log.Fatal(err)
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}
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if err := tmpFile.Close(); err != nil {
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log.Fatal(err)
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}
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err = os.Chmod(tmpFile.Name(), 0700)
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if err != nil {
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log.Fatal(err)
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}
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name := flag.String("name", "", "name of service")
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dir := flag.String("dir", tmpDir, "directory containing vnstat images")
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flag.Parse()
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s := &tsnet.Server{
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Hostname: *name,
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}
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ln, err := s.Listen("tcp", ":80")
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if err != nil {
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log.Fatal(err)
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}
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defer ln.Close()
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host, err := os.Hostname()
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if err != nil {
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log.Fatal(err)
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}
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go func() {
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for {
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log.Printf("running %q in %q", tmpFile.Name(), tmpDir)
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ifaces, err := net.Interfaces()
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if err != nil {
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log.Fatal(err)
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}
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var ifNames []string
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for _, intf := range ifaces {
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ifNames = append(ifNames, intf.Name)
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}
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genCmd := exec.Command(tmpFile.Name(), ifNames...)
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genCmd.Dir = *dir
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_, err = genCmd.Output()
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if err != nil {
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log.Fatal(err)
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}
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time.Sleep(5 * time.Minute)
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}
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}()
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mux := http.NewServeMux()
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fileServer := http.FileServer(http.Dir(*dir))
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mux.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
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fileServer.ServeHTTP(w, r)
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})
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mux.HandleFunc("/index.html", http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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images, err := os.ReadDir(*dir)
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if err != nil {
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http.Error(w, err.Error(), 500)
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return
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}
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fmt.Fprintf(w, `<html>
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<head>
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<title>%s</title>
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<style>%s</style>
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</head>
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<body>
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<h1>vnstat for %s</h1>`, host, style, host)
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sort.Slice(images, func(i, j int) bool {
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return images[i].Name() < images[j].Name()
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})
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prefix := ""
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oldPrefix := ""
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for _, img := range images {
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in := img.Name()
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imgPrefix := strings.Split(in, "-")[0]
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headImg := fmt.Sprintf("%s-s.png", imgPrefix)
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if prefix != imgPrefix {
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if oldPrefix != prefix {
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fmt.Fprintf(w, "</p></details>")
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}
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fmt.Fprintf(w, "<details><summary><img src=%q /></summary><p>", headImg)
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prefix = imgPrefix
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}
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if in != headImg {
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fmt.Fprintf(w, "<img src=%q /><br />", in)
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}
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}
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}))
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hs := &http.Server{
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Handler: mux,
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}
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log.Panic(hs.Serve(ln))
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}
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