squawks about network lag while you're playing minecraft to correlate oddities in the game with digitalocean's spotty network

delaysquawk.go

package main

import (
  "flag"
	"io/ioutil"
	"net/http"
	"os/exec"
	"time"
)

func main() {
	var url = flag.String("url", "http://ocean.collinvandyck.com", "the url to ping")
	var delayMillis = flag.Int("delay", 1000, "how long to wait between tests")
	var timeoutMillis = flag.Int("timeout", 500, "when to squawk")
	flag.Parse()
	for {
		errCh := getUrl(*url)
		timeoutCh := time.After(time.Duration(*timeoutMillis) * time.Millisecond)
		select {
		case err := <-errCh:
			if err != nil {
				exec.Command("/usr/bin/say", "-v", "cello", "ack error").Run()
			}
		case <-timeoutCh:
			exec.Command("/usr/bin/say", "-v", "cello", "lag lag lag").Run()
		}
		time.Sleep(time.Duration(*delayMillis) * time.Millisecond)
	}
}

func getUrl(url string) chan error {
	ch := make(chan error)
	go func() {
		resp, err := http.Get(url)
		if err != nil {
			ch <- err
			return
		}
		defer resp.Body.Close()
		_, err = ioutil.ReadAll(resp.Body)
		if err != nil {
			ch <- err
			return
		}
		ch <- nil
	}()
	return ch
}