package main

import (
	"context"
	"log"
	"os"
	"os/signal"
	"syscall"
	"time"
)

type Runnable func(ctx context.Context) error

func Run(ctx context.Context, runnable ...Runnable) {
	ctx, cancel := context.WithCancel(ctx)
	defer cancel()

	errCh := make(chan error, len(runnable))

	for _, r := range runnable {
		go func(run Runnable) {
			if err := run(ctx); err != nil {
				errCh <- err
			}
		}(r)
	}

	sigCh := make(chan os.Signal, 1)
	signal.Notify(sigCh, syscall.SIGINT, syscall.SIGTERM)

	select {
	case sig := <-sigCh:
		log.Println("shutdown signal:", sig)
	case err := <-errCh:
		log.Println("runtime error:", err)
	}

	cancel()
	time.Sleep(2 * time.Second)
}