63 lines
1.2 KiB
Go
63 lines
1.2 KiB
Go
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package main
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import (
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"embed"
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"html"
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"io/fs"
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"log/slog"
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"net/http"
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"os"
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"os/exec"
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"strings"
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)
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//go:embed web/*
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var webFS embed.FS
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func main() {
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addr := os.Getenv("LISTEN_ADDR")
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if addr == "" {
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addr = "127.0.0.1:8080"
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}
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static, err := fs.Sub(webFS, "web")
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if err != nil {
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slog.Error("embed fs", "err", err)
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os.Exit(1)
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}
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indexHTML, err := fs.ReadFile(static, "index.html")
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if err != nil {
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slog.Error("read index", "err", err)
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os.Exit(1)
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}
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mux := http.NewServeMux()
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mux.HandleFunc("GET /", func(w http.ResponseWriter, r *http.Request) {
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if r.URL.Path != "/" {
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http.NotFound(w, r)
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return
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}
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uptime := uptimeLine()
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body := strings.ReplaceAll(string(indexHTML), "{{uptime}}", html.EscapeString(uptime))
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w.Header().Set("Content-Type", "text/html; charset=utf-8")
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w.Header().Set("Cache-Control", "no-store")
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_, _ = w.Write([]byte(body))
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})
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mux.Handle("GET /style.css", http.FileServer(http.FS(static)))
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slog.Info("listening", "addr", addr)
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if err := http.ListenAndServe(addr, mux); err != nil {
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slog.Error("serve", "err", err)
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os.Exit(1)
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}
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}
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func uptimeLine() string {
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out, err := exec.Command("uptime").Output()
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if err != nil {
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return "uptime unavailable"
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}
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return strings.TrimSpace(string(out))
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}
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