Golang log.Exitf函数代码示例

func main() {
	runtime.LockOSThread()
	if srpc.Enabled() {
		go srpc.ServeRuntime()
	}

	w, err := av.Init(av.SubsystemVideo, 512, 512)
	if err != nil {
		log.Exitf("av.Init: %s", err)
	}

	go quitter(w.QuitChan())

	var m SpacewarPDP1
	m.Init(w)
	m.PC = 4
	f := bytes.NewBuffer(strings.Bytes(spacewarCode))
	if err = m.Load(f); err != nil {
		log.Exitf("loading %s: %s", "spacewar.lst", err)
	}
	for err == nil {
		//fmt.Printf("step PC=%06o ", m.PC);
		//fmt.Printf("inst=%06o AC=%06o IO=%06o OV=%o\n",
		//	m.Mem[m.PC], m.AC, m.IO, m.OV);
		err = m.Step()
	}
	log.Exitf("step: %s", err)
}

func main() {
	flag.Parse()

	if sumSet(flagFile, flagBlob, flagPermanode, flagInit, flagShare) != 1 {
		// TODO: say which ones are conflicting
		usage("Conflicting mode options.")
	}

	client := client.NewOrFail()
	if !*flagVerbose {
		client.SetLogger(nil)
	}
	uploader := &Uploader{client}

	switch {
	case *flagInit:
		doInit()
		return
	case *flagPermanode:
		if flag.NArg() > 0 {
			log.Exitf("--permanode doesn't take any additional arguments")
		}
		pr, err := uploader.UploadNewPermanode()
		handleResult("permanode", pr, err)
	case *flagFile || *flagBlob:
		for n := 0; n < flag.NArg(); n++ {
			if *flagBlob {
				pr, err := uploader.UploadFileBlob(flag.Arg(n))
				handleResult("blob", pr, err)
			} else {
				pr, err := uploader.UploadFile(flag.Arg(n))
				handleResult("file", pr, err)
			}
		}
	case *flagShare:
		if flag.NArg() != 1 {
			log.Exitf("--share only supports one blobref")
		}
		br := blobref.Parse(flag.Arg(0))
		if br == nil {
			log.Exitf("BlobRef is invalid: %q", flag.Arg(0))
		}
		pr, err := uploader.UploadShare(br, *flagTransitive)
		handleResult("share", pr, err)
	}

	if *flagVerbose {
		stats := uploader.Stats()
		log.Printf("Client stats: %s", stats.String())
	}
	if wereErrors {
		os.Exit(2)
	}
}

func main() {
	flag.Parse()

	urandom, err := os.Open("/dev/urandom", os.O_RDONLY, 0)
	if err != nil {
		log.Exitf("failed to open /dev/urandom: %s", err)
		return
	}

	priv, err := rsa.GenerateKey(urandom, 1024)
	if err != nil {
		log.Exitf("failed to generate private key: %s", err)
		return
	}

	now := time.Seconds()

	template := x509.Certificate{
		SerialNumber: []byte{0},
		Subject: x509.Name{
			CommonName:   *hostName,
			Organization: "Acme Co",
		},
		NotBefore: time.SecondsToUTC(now - 300),
		NotAfter:  time.SecondsToUTC(now + 60*60*24*365), // valid for 1 year.

		SubjectKeyId: []byte{1, 2, 3, 4},
		KeyUsage:     x509.KeyUsageKeyEncipherment | x509.KeyUsageDigitalSignature,
	}

	derBytes, err := x509.CreateCertificate(urandom, &template, &template, &priv.PublicKey, priv)
	if err != nil {
		log.Exitf("Failed to create certificate: %s", err)
		return
	}

	certOut, err := os.Open("cert.pem", os.O_WRONLY|os.O_CREAT, 0644)
	if err != nil {
		log.Exitf("failed to open cert.pem for writing: %s", err)
		return
	}
	pem.Encode(certOut, &pem.Block{Type: "CERTIFICATE", Bytes: derBytes})
	certOut.Close()
	log.Print("written cert.pem\n")

	keyOut, err := os.Open("key.pem", os.O_WRONLY|os.O_CREAT, 0600)
	if err != nil {
		log.Print("failed to open key.pem for writing:", err)
		return
	}
	pem.Encode(keyOut, &pem.Block{Type: "RSA PRIVATE KEY", Bytes: x509.MarshalPKCS1PrivateKey(priv)})
	keyOut.Close()
	log.Print("written key.pem\n")
}

func StaticUrl(filename string) string {
	file, err := os.Open(GetConfig("docroot") + "/" + filename, os.O_RDONLY, 0444)
	if err != nil {
		log.Exitf("Impossible to open %s", filename, err)
	}
	dir, err := file.Stat()
	if err != nil {
		log.Exitf("Impossible to stat %s", filename, err)
	}
	secs := dir.Mtime_ns / 1e9
	return fmt.Sprintf("/%s?%d", filename, secs)
}

func readTemplate(name string) *template.Template {
	fileName := path.Join(*root, "tmpl", name)
	data, err := ioutil.ReadFile(fileName)
	if err != nil {
		log.Exitf("ReadFile %s: %v", fileName, err)
	}
	t, err := template.Parse(string(data), fmap)
	if err != nil {
		log.Exitf("%s: %v", fileName, err)
	}
	return t
}

func readTemplate(name string) *template.Template {
	path := pathutil.Join(*tmplroot, name)
	data, err := ioutil.ReadFile(path)
	if err != nil {
		log.Exitf("ReadFile %s: %v", path, err)
	}
	t, err := template.Parse(string(data), fmap)
	if err != nil {
		log.Exitf("%s: %v", name, err)
	}
	return t
}

func WriteConfig(config *Config) {
	buf := &bytes.Buffer{}
	err := json.Marshal(buf, *config)
	if err != nil {
		log.Exitf("Failed to marshal config file: %s\n", err)
	}

	// TODO atomic update without truncating file
	err = io.WriteFile(configFilename, buf.Bytes(), configPerms)
	if err != nil {
		log.Exitf("Can't write config file: %s\n", err)
	}
}

func main() {
	flag.Parse()

	client := client.NewOrFail()
	if *flagCheck {
		// Simply do HEAD requests checking if the blobs exists.
		return
	}

	var w io.Writer = os.Stdout

	for n := 0; n < flag.NArg(); n++ {
		arg := flag.Arg(n)
		br := blobref.Parse(arg)
		if br == nil {
			log.Exitf("Failed to parse argument \"%s\" as a blobref.", arg)
		}
		if *flagVerbose {
			log.Printf("Need to fetch %s", br.String())
		}
		var (
			r   blobref.ReadSeekCloser
			err os.Error
		)

		if len(*flagVia) > 0 {
			vs := strings.Split(*flagVia, ",", -1)
			abr := make([]*blobref.BlobRef, len(vs))
			for i, sbr := range vs {
				abr[i] = blobref.Parse(sbr)
				if abr[i] == nil {
					log.Exitf("Invalid -via blobref: %q", sbr)
				}
				if *flagVerbose {
					log.Printf("via: %s", sbr)
				}
			}
			r, _, err = client.FetchVia(br, abr)
		} else {
			r, _, err = client.Fetch(br)
		}
		if err != nil {
			log.Exitf("Failed to fetch %q: %s", br, err)
		}
		_, err = io.Copy(w, r)
		if err != nil {
			log.Exitf("Failed transferring %q: %s", br, err)
		}
	}

}

func ReadConfig(filename string) {
	contents, err := ioutil.ReadFile(filename)
	if err != nil {
		log.Exitf("Impossible to read %s", filename, err)
	}
	data, err := json.Decode(string(contents))
	if err != nil {
		log.Exitf("Can't parse %s as JSON", filename, err)
	}
	config = map[string]string{}
	for key, value := range data.(map[string]interface{}) {
		config[key] = value.(string)
	}
}

func main() {
	nlmsg, err := netlink.NewMessage(rtnetlink.RTM_GETADDR, netlink.NLM_F_DUMP|netlink.NLM_F_REQUEST, &addr.Header{}, 4)
	if err != nil {
		log.Exitf("Couldn't construct message: %v", err)
	}
	log.Printf("Dialing: %v", nlmsg)
	nlsock, err := netlink.Dial(netlink.NETLINK_ROUTE)
	if err != nil {
		log.Exitf("Couldn't dial netlink: %v", err)
	}
	h := netlink.NewHandler(nlsock)
	ec := make(chan os.Error)
	go logec(ec)
	go h.Start(ec)
	log.Printf("Sending query: %v", nlmsg)
	c, err := h.Query(*nlmsg, 1, 4)
	log.Printf("Sent query: %v", nlmsg.Header)
	if err != nil {
		log.Exitf("Couldn't write netlink: %v", err)
	}
	for i := range c {
		if i.Header.MessageType() == netlink.NLMSG_DONE {
			break
		}
		switch i.Header.MessageType() {
		case rtnetlink.RTM_NEWADDR:
			hdr := &addr.Header{}
			msg := rtnetlink.NewMessage(hdr, nil)
			err = msg.UnmarshalNetlink(i.Body, 4)
			if err == nil {
				log.Printf("Family: %v; Length: %d; Flags: %v; Scope: %v; IFIndex: %d",
					hdr.AddressFamily(), hdr.PrefixLength(), hdr.Flags(), hdr.Scope(),
					hdr.InterfaceIndex())

				for i := range msg.Attributes {
					log.Printf("Attribute[%d] = %v", i, msg.Attributes[i])
				}
			} else {
				log.Printf("Unmarshal error: %v", err)
			}
		default:
			log.Printf("Unknown type: %v", i)
		}
		if err != nil {
			log.Printf("Handler error: %v", err)
		}
	}
}

func main() {
	var address, key string
	var count, delay, step int
	flag.StringVar(&address, "address", "127.0.0.1:6311", "Set the port (+optional address) to send packets to")
	flag.StringVar(&key, "key", "profile", "Set the key name (pakets data will be \"key:idx\")")
	flag.IntVar(&count, "count", 1000, "Set the number of packets to send")
	flag.IntVar(&delay, "delay", 1000000, "Set the delay between packets in nanoseconds (10^-9)")
	flag.IntVar(&step, "step", 100, "Log step (how many packets to send between logging)")
	flag.Parse()

	udp_address, error := net.ResolveUDPAddr(address)
	if error != nil {
		log.Exitf("Cannot parse \"%s\": %s", address, error)
	}

	log.Stdout(udp_address)

	ticker := time.NewTicker(int64(delay))
	defer ticker.Stop()

	for sent := 1; sent <= count; sent++ {
		<-ticker.C
		send(udp_address, key, sent)
		if sent%step == 0 {
			log.Stdoutf("Processed %d packets of %d", sent, count)
		}
	}
}

func (c *client) CallWithProgress(method string, data []byte, progress ProgressHandler) []byte {
	// TODO: implement

	// TODO: shard onto a c.hosts[] entry, wait for its connection state, etc.
	log.Exitf("TODO: implement CallWithProgress")
	return nil
}

func ReadConfig() *Config {
	content, err := io.ReadFile(configFilename)
	if err != nil {
		log.Exitf("Can't open config file: %s\n", err)
	}
	return ParseConfig(string(content))
}

func main() {
	flag.Parse()
	readTemplates()

	if *root == "" {
		var err os.Error
		*root, err = os.Getwd()
		if err != nil {
			log.Exitf("Failed to getwd: %v", err)
		}
	}

	mux := http.DefaultServeMux
	mux.Handle("/favicon.ico", http.FileServer(path.Join(*root, "static"), "/"))
	mux.Handle("/robots.txt", http.FileServer(path.Join(*root, "static"), "/"))
	mux.Handle("/static/", http.FileServer(path.Join(*root, "static"), "/static/"))

	testCgi := &CgiHandler{ExecutablePath: path.Join(*root, "test.cgi"),
		Root: "/test.cgi",
	}
	mux.Handle("/test.cgi", testCgi)
	mux.Handle("/test.cgi/foo", testCgi)

	mux.Handle("/code", http.RedirectHandler("/code/", http.StatusFound))
	if *gitwebScript != "" {
		env := os.Environ()
		env = append(env, "GITWEB_CONFIG="+path.Join(*root, "gitweb-camli.conf"))
		env = append(env, "CAMWEB_ROOT="+path.Join(*root))
		mux.Handle("/code/", &gitwebHandler{
			Cgi: &CgiHandler{
				ExecutablePath: *gitwebScript,
				Root:           "/code/",
				Environ:        env,
			},
			Static: http.FileServer(*gitwebFiles, "/code/"),
		})
	}
	mux.HandleFunc("/", mainHandler)

	var handler http.Handler = &noWwwHandler{Handler: mux}
	if *logDir != "" || *logStdout {
		handler = NewLoggingHandler(handler, *logDir, *logStdout)
	}
	if err := http.ListenAndServe(*httpAddr, handler); err != nil {
		log.Exitf("ListenAndServe %s: %v", *httpAddr, err)
	}
}

func ParseConfig(config string) *Config {
	var c = &Config{}
	ok, errtok := json.Unmarshal(config, c)
	if !ok {
		log.Exitf("Config syntax error: %s\n", errtok)
	}
	return c
}