Embed rstream tunnels in your application

package main

import (
	"context"
	"errors"
	"fmt"
	"log"
	"net"
	"net/http"
	"os"
	"os/signal"
	"syscall"
	"time"

	"github.com/rstreamlabs/rstream-go"
	"github.com/rstreamlabs/rstream-go/config"
)

func main() {
	ctx, stop := signal.NotifyContext(context.Background(), os.Interrupt, syscall.SIGTERM)
	defer stop()
	client, err := config.NewClientFromEnv()
	if err != nil {
		log.Fatal(err)
	}
	ctrl, err := client.Connect(ctx, nil)
	if err != nil {
		log.Fatal(err)
	}
	defer ctrl.Close()
	tunnel, err := ctrl.CreateTunnel(ctx, rstream.TunnelProperties{
		Protocol:    rstream.ProtocolPtr(rstream.ProtocolHTTP),
		HTTPVersion: rstream.HTTPVersionPtr(rstream.HTTP1_1),
		Publish:     rstream.BoolPtr(true),
	})
	if err != nil {
		log.Fatal(err)
	}
	defer tunnel.Close()
	addr, _ := tunnel.ForwardingAddress()
	fmt.Printf("Server accessible at: %s\n", addr)
	hostname, err := os.Hostname()
	if err != nil {
		hostname = "unknown"
	}
	listener, ok := tunnel.(net.Listener)
	if !ok {
		log.Fatal("tunnel does not implement net.Listener")
	}
	handler := http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		w.Header().Set("Content-Type", "text/plain")
		fmt.Fprint(w, hostname)
	})
	server := &http.Server{Handler: handler}
	errCh := make(chan error, 1)
	go func() {
		errCh <- server.Serve(listener)
	}()
	select {
	case <-ctx.Done():
		shutdownCtx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
		defer cancel()
		if err := server.Shutdown(shutdownCtx); err != nil && !errors.Is(err, http.ErrServerClosed) {
			log.Fatal(err)
		}
	case err := <-errCh:
		if err != nil && !errors.Is(err, http.ErrServerClosed) && !errors.Is(err, net.ErrClosed) {
			log.Fatal(err)
		}
	}
}