Golang log.Panic函数代码示例

func upload(res http.ResponseWriter, req *http.Request) {
	defer logException(res, req)

	if req.Method == "POST" {
		file, _, err := req.FormFile("pic")

		if err != nil {
			log.Panic(err)
		}
		defer file.Close()

		wr := &manager.MongoWriter{}
		image, err := asciiEncoder.DecodeImage(file)
		if err != nil {
			log.Panic(err)
		}

		err = asciiEncoder.Asciify(image, wr)
		if err != nil {
			log.Panic(err)
		}

		uri := mongoArtManager.Save(wr)
		http.Redirect(res, req, "/art/"+uri, 302)
	}
}

//generate signature in repeatable way
func SignDeterministic(msg []byte, seckey []byte, nonce_seed []byte) []byte {
	nonce := SumSHA256(nonce_seed) //deterministicly generate nonce

	var sig []byte = make([]byte, 65)
	var recid C.int

	var msg_ptr *C.uchar = (*C.uchar)(unsafe.Pointer(&msg[0]))
	var seckey_ptr *C.uchar = (*C.uchar)(unsafe.Pointer(&seckey[0]))
	var nonce_ptr *C.uchar = (*C.uchar)(unsafe.Pointer(&nonce[0]))
	var sig_ptr *C.uchar = (*C.uchar)(unsafe.Pointer(&sig[0]))

	if C.secp256k1_ecdsa_seckey_verify(seckey_ptr) != C.int(1) {
		log.Panic("Invalid secret key")
	}

	ret := C.secp256k1_ecdsa_sign_compact(
		msg_ptr, C.int(len(msg)),
		sig_ptr,
		seckey_ptr,
		nonce_ptr,
		&recid)

	sig[64] = byte(int(recid))

	if int(recid) > 4 {
		log.Panic()
	}

	if ret != 1 {
		return SignDeterministic(msg, seckey, nonce_seed) //nonce invalid,retry
	}

	return sig
}

func (self *Visor) CreateGenesisBlockInit() (SignedBlock, error) {
	self.GenesisPreconditions()

	if len(self.Blockchain.Blocks) != 0 || len(self.blockSigs.Sigs) != 0 {
		log.Panic("Blockchain already has genesis")
	}
	if self.Config.BlockchainPubkey != cipher.PubKeyFromSecKey(self.Config.BlockchainSeckey) {
		log.Panicf("Cannot create genesis block. Invalid secret key for pubkey")
	}

	gb := self.Blockchain.CreateGenesisBlock(self.Config.GenesisAddress,
		self.Config.GenesisTimestamp, self.Config.GenesisCoinVolume)
	sb := self.SignBlock(gb)
	if err := self.verifySignedBlock(&sb); err != nil {
		log.Panic("Signed a fresh genesis block, but its invalid: %v", err)
	}
	self.blockSigs.record(&sb)

	log.Printf("New Genesis:")
	log.Printf("genesis_time= %v", sb.Block.Head.Time)
	log.Printf("genesis_address= %v", self.Config.GenesisAddress.String())
	log.Printf("genesis_signature= %v", sb.Sig.Hex())

	return sb, nil
}

func (p *Pool) print(first bool) bool {
	var out string
	if !first {
		coords, err := getCursorPos()
		if err != nil {
			log.Panic(err)
		}
		coords.Y -= int16(len(p.bars))
		coords.X = 0

		err = setCursorPos(coords)
		if err != nil {
			log.Panic(err)
		}
	}
	isFinished := true
	for _, bar := range p.bars {
		if !bar.isFinish {
			isFinished = false
		}
		bar.Update()
		out += fmt.Sprintf("\r%s\n", bar.String())
	}
	fmt.Print(out)
	return isFinished
}

func main() {
	jenkins_address := os.Getenv("JENKINS_URL")
	listen_address := os.Getenv("LISTEN_ADDRESS")

	if listen_address == "" {
		listen_address = "[::]:8080"
	}
	if jenkins_address == "" {
		log.Fatalln("Use environment variables JENKINS_URL and LISTEN_ADDRESS (default \"[::]:8080\")")
	}

	remote, err := url.Parse(jenkins_address)
	if err != nil {
		log.Panic(err)
	}

	proxy := httputil.NewSingleHostReverseProxy(remote)
	http.HandleFunc("/", handler(proxy))

	log.Println("jenkins-authentication-proxy", version, "starting")
	log.Println("Authentication endpoint:", planio_url)
	err = http.ListenAndServe(listen_address, nil)
	if err != nil {
		log.Panic(err)
	}
}

// Loads a blockchain but subdues errors into the logger, or panics.
// If no blockchain is found, it creates a new empty one
func loadBlockchain(filename string, genAddr coin.Address) *coin.Blockchain {
	bc := &coin.Blockchain{}
	created := false
	if filename != "" {
		var err error
		bc, err = LoadBlockchain(filename)
		if err == nil {
			if len(bc.Blocks) == 0 {
				log.Panic("Loaded empty blockchain")
			}
			loadedGenAddr := bc.Blocks[0].Body.Transactions[0].Out[0].Address
			if loadedGenAddr != genAddr {
				log.Panic("Configured genesis address does not match the " +
					"address in the blockchain")
			}
			created = true
		} else {
			if os.IsNotExist(err) {
				logger.Info("No blockchain file, will create a new blockchain")
			} else {
				log.Panicf("Failed to load blockchain file \"%s\": %v",
					filename, err)
			}
		}
	}
	if !created {
		bc = coin.NewBlockchain()
	}
	return bc
}

func main() {
	//log.SetLevel(log.DebugLevel)

	// Create a new client
	client := client.NewXenAPIClient("127.0.0.1", "username", "password")

	// Login, this will create a session that is used by all other methods
	err := client.Login()
	if err != nil {
		log.Panic(err)
	}

	// Fetch a list of all VMs, unfortunaly this will return templates and the domain controller as well
	vms, err := client.GetVMs()
	if err != nil {
		log.Panic(err)
	}

	// Loop thru all VMs
	for _, vm := range vms {
		// Fetch information about this vm. This method will also return a list with all available records
		vm.GetRecord()

		// Ignore all that is not a VM (templates and domain controller)
		if !vm.IsVM {
			continue
		}

		// Print out information about the VM
		fmt.Printf("%s (%s) - %s\n", vm.Name, vm.PowerState, vm.Description)
	}

}

func initDataBase() *sql.DB {
	db, err := sql.Open("sqlite3", "./sites.db")
	if err != nil {
		log.Fatal(err)
	}
	defer db.Close()

	sqlStmt := `
	DELETE FROM sites;
	DROP TABLE sites;
	`
	db.Exec(sqlStmt)
	if err != nil {
		log.Panic("%q: %s\n", err, sqlStmt)
		os.Exit(1)
	}

	sqlStmt = `
	CREATE TABLE sites (domain TEXT NOT NULL PRIMARY KEY, code INTEGER);
	`
	_, err = db.Exec(sqlStmt)
	if err != nil {
		log.Panic("%q: %s\n", err, sqlStmt)
		os.Exit(1)
	}

	return db
}

func make_window(w, h int, title string) func() {
	// Required to make sure that the OpenGL go-routine doesn't get switched
	// to another thread (=> kerblammo)
	runtime.LockOSThread()

	if err := glfw.Init(); err != nil {
		log.Panic("glfw Error:", err)
	}

	err := glfw.OpenWindow(w, h, 0, 0, 0, 0, 0, 0, glfw.Windowed)
	if err != nil {
		log.Panic("Error:", err)
	}

	if gl.Init() != 0 {
		log.Panic("gl error")
	}

	if *vsync {
		glfw.SetSwapInterval(1)
	} else {
		glfw.SetSwapInterval(0)
	}

	glfw.SetWindowTitle(title)
	glfw.SetWindowSizeCallback(Reshape)

	Init()

	return func() {
		glfw.Terminate()
		glfw.CloseWindow()
		log.Print("Cleanup")
	}
}

//recovers the public key from the signature
//recovery of pubkey means correct signature
func RecoverPubkey(msg []byte, sig []byte) []byte {
	if len(sig) != 65 {
		log.Panic()
	}

	var recid int = int(sig[64])

	pubkey, ret := secp.RecoverPublicKey(
		sig[0:64],
		msg,
		recid)

	if ret != 1 {
		log.Printf("RecoverPubkey: code %s", ret)
		return nil
	}
	//var pubkey2 []byte = pubkey1.Bytes() //compressed

	if pubkey == nil {
		log.Panic("ERROR: impossible, pubkey nil and ret ==1")
	}
	if len(pubkey) != 33 {
		log.Panic("pubkey length wrong")
	}

	return pubkey
	//nonce1.SetBytes(nonce_seed)

}

//raise a pubkey to the power of a seckey
func ECDH(pub []byte, sec []byte) []byte {
	if len(sec) != 32 {
		log.Panic()
	}

	if len(pub) != 33 {
		log.Panic()
	}

	if VerifySeckey(sec) != 1 {
		log.Printf("Invalid Seckey")
	}

	if ret := VerifyPubkey(pub); ret != 1 {
		log.Printf("Invalid Pubkey, %d", ret)
		return nil
	}

	pubkey_out := secp.Multiply(pub, sec)
	if pubkey_out == nil {
		return nil
	}
	if len(pubkey_out) != 33 {
		log.Panic("ERROR: impossible, invalid pubkey length")
	}
	return pubkey_out
}

func RemoveFromRegistry(r *RpcService) {

	newServices := make([]*RpcService, 0)

	for _, v := range NOS.Services {
		if v != nil {
			if !v.Equal(r) {
				newServices = append(newServices, v)
			}

		}
	}
	NOS.Services = newServices
	b, err := json.Marshal(NOS)
	if err != nil {
		log.Panic(err.String())
	}
	rev, err := DC.Rev()
	if err != nil {
		log.Panic(err.String())
	}
	_, err = DC.Set("/servers/config/networkservers.conf", rev, b)
	if err != nil {
		log.Panic(err.String())
	}
}

func RemoveService(i int) {

	newServices := make([]*RpcService, 0)

	for k, v := range NOS.Services {
		if k != i {
			if v != nil {
				newServices = append(newServices, v)
			}
		}
	}
	NOS.Services = newServices
	b, err := json.Marshal(NOS)
	if err != nil {
		log.Panic(err.String())
	}
	rev, err := DC.Rev()
	if err != nil {
		log.Panic(err.String())
	}
	_, err = DC.Set("/servers/config/networkservers.conf", rev, b)
	if err != nil {
		log.Panic(err.String())
	}

}

func main() {
	robot := robot.NewRobot()
	if err := robot.Start(); err != nil {
		log.Panic(err)
	}

	bot, err := tgbotapi.NewBotAPI(os.Getenv("BOT_TOKEN"))
	if err != nil {
		log.Panic(err)
	}

	bot.Debug = true

	u := tgbotapi.NewUpdate(0)
	u.Timeout = 60

	updates, err := bot.GetUpdatesChan(u)
	if err != nil {
		log.Panic(err)
	}

	for update := range updates {
		log.Printf("[%s] %s", update.Message.From.UserName, update.Message.Text)

		bot.Send(robot.Response(update.Message))
	}
}

func GetServerIP() string {
	ifaces, err := net.Interfaces()
	if err != nil {
		log.Panic("Can't acess the network interfaces.")
	}
	var ip net.IP
	for _, i := range ifaces {
		addrs, err := i.Addrs()
		if err != nil {
			log.Panic("Can't read the IP.")
		}
		for _, addr := range addrs {
			switch v := addr.(type) {
			case *net.IPNet:
				//log.Printf("Evaluating IPNet: %v\r\n", v.IP)
				if (v.IP.To4() != nil) && !v.IP.IsLinkLocalUnicast() && !v.IP.IsLoopback() && !v.IP.IsMulticast() {
					ip = v.IP
				}
			case *net.IPAddr:
				//log.Printf("Evaluating IPAddr: %v\r\n", v.IP)
				if (v.IP.To4() != nil) && !v.IP.IsLinkLocalUnicast() && !v.IP.IsLoopback() && !v.IP.IsMulticast() {
					ip = v.IP
				}
			}
		}
	}
	// process IP address
	return ip.String()
}