Golang Interface.WithError方法代碼示例

// SetApp stores the app ID and app EUI preferences
func SetApp(ctx log.Interface, appID string, appEUI types.AppEUI) {
	config := readData(appFilename)
	config[idKey] = appID
	config[euiKey] = appEUI.String()
	err := writeData(appFilename, config)
	if err != nil {
		ctx.WithError(err).Fatal("Could not save app preference")
	}
}

// ForceRefreshToken forces a refresh of the access token
func ForceRefreshToken(ctx log.Interface) {
	tokenSource := GetTokenSource(ctx).(*ttnctlTokenSource)
	token, err := tokenSource.Token()
	if err != nil {
		ctx.WithError(err).Fatal("Could not get access token")
	}
	token.Expiry = time.Now().Add(-1 * time.Second)
	tokenSource.source = oauth2.ReuseTokenSource(token, getAccountServerTokenSource(token))
	tokenSource.Token()
}

func saveToken(ctx log.Interface, token *oauth2.Token) {
	data, err := json.Marshal(token)
	if err != nil {
		ctx.WithError(err).Fatal("Could not save access token")
	}
	err = GetTokenCache().Set(tokenName(), data)
	if err != nil {
		ctx.WithError(err).Fatal("Could not save access token")
	}
}

// GetAccount gets a new Account server client for ttnctl
func GetAccount(ctx log.Interface) *account.Account {
	token, err := GetTokenSource(ctx).Token()
	if err != nil {
		ctx.WithError(err).Fatal("Could not get access token")
	}

	server := viper.GetString("auth-server")
	manager := GetTokenManager(token.AccessToken)

	return account.NewWithManager(server, token.AccessToken, manager).WithHeader("User-Agent", GetUserAgent())
}

// GetContext returns a new context
func GetContext(ctx log.Interface, extraPairs ...string) context.Context {
	token, err := GetTokenSource(ctx).Token()
	if err != nil {
		ctx.WithError(err).Fatal("Could not get token")
	}
	md := metadata.Pairs(
		"id", GetID(),
		"service-name", "ttnctl",
		"service-version", fmt.Sprintf("%s-%s (%s)", viper.GetString("version"), viper.GetString("gitCommit"), viper.GetString("buildDate")),
		"token", token.AccessToken,
	)
	return metadata.NewContext(context.Background(), md)
}

// GetDiscovery gets the Discovery client for ttnctl
func GetDiscovery(ctx log.Interface) (*grpc.ClientConn, discovery.DiscoveryClient) {
	path := path.Join(GetDataDir(), "/ca.cert")
	cert, err := ioutil.ReadFile(path)
	if err == nil && !api.RootCAs.AppendCertsFromPEM(cert) {
		ctx.Warnf("Could not add root certificates from %s", path)
	}

	conn, err := api.Dial(viper.GetString("discovery-address"))
	if err != nil {
		ctx.WithError(err).Fatal("Could not connect to Discovery server")
	}
	return conn, discovery.NewDiscoveryClient(conn)
}

func TokenForScope(ctx log.Interface, scope string) string {
	token, err := GetTokenSource(ctx).Token()
	if err != nil {
		ctx.WithError(err).Fatal("Could not get token")
	}

	restricted, err := GetTokenManager(token.AccessToken).TokenForScope(scope)
	if err != nil {
		ctx.WithError(err).Fatal("Could not get correct rights")
	}

	return restricted
}

func getStoredToken(ctx log.Interface) *oauth2.Token {
	tokenCache := GetTokenCache()
	data, err := tokenCache.Get(tokenName())
	if err != nil {
		ctx.WithError(err).Fatal("Could not read stored token")
	}
	if data == nil {
		ctx.Fatal("No account information found. Please login with ttnctl user login [access code]")
	}

	token := &oauth2.Token{}
	err = json.Unmarshal(data, token)
	if err != nil {
		ctx.Fatal("Account information invalid. Please login with ttnctl user login [access code]")
	}
	return token
}

// GetRouter starts a connection with the router
func GetRouter(ctx log.Interface) (*grpc.ClientConn, router.RouterClient) {
	ctx.Info("Discovering Router...")
	dscConn, client := GetDiscovery(ctx)
	defer dscConn.Close()
	routerAnnouncement, err := client.Get(GetContext(ctx), &discovery.GetRequest{
		ServiceName: "router",
		Id:          viper.GetString("router-id"),
	})
	if err != nil {
		ctx.WithError(errors.FromGRPCError(err)).Fatal("Could not get Router from Discovery")
	}
	ctx.Info("Connecting with Router...")
	rtrConn, err := routerAnnouncement.Dial()
	ctx.Info("Connected to Router")
	rtrClient := router.NewRouterClient(rtrConn)
	return rtrConn, rtrClient
}

// GetAppEUI returns the AppEUI that must be set in the command options or config
func GetAppEUI(ctx log.Interface) types.AppEUI {
	appEUIString := viper.GetString("app-eui")
	if appEUIString == "" {
		appData := readData(appFilename)
		eui, ok := appData[euiKey].(string)
		if !ok {
			ctx.Fatal("Invalid AppEUI in config file")
		}
		appEUIString = eui
	}

	if appEUIString == "" {
		ctx.Fatal("Missing AppEUI. You should select an application to use with \"ttnctl applications select\"")
	}

	eui, err := types.ParseAppEUI(appEUIString)
	if err != nil {
		ctx.WithError(err).Fatal("Invalid AppEUI")
	}
	return eui
}

// GetHandlerManager gets a new HandlerManager for ttnctl
func GetHandlerManager(ctx log.Interface, appID string) (*grpc.ClientConn, *handler.ManagerClient) {
	ctx.WithField("Handler", viper.GetString("handler-id")).Info("Discovering Handler...")
	dscConn, client := GetDiscovery(ctx)
	defer dscConn.Close()
	handlerAnnouncement, err := client.Get(GetContext(ctx), &discovery.GetRequest{
		ServiceName: "handler",
		Id:          viper.GetString("handler-id"),
	})
	if err != nil {
		ctx.WithError(errors.FromGRPCError(err)).Fatal("Could not find Handler")
	}

	token := TokenForScope(ctx, scope.App(appID))

	ctx.WithField("Handler", handlerAnnouncement.NetAddress).Info("Connecting with Handler...")
	hdlConn, err := handlerAnnouncement.Dial()
	if err != nil {
		ctx.WithError(err).Fatal("Could not connect to Handler")
	}
	managerClient, err := handler.NewManagerClient(hdlConn, token)
	if err != nil {
		ctx.WithError(err).Fatal("Could not create Handler Manager")
	}
	return hdlConn, managerClient
}

// continue looking at dns entry for changes in config
func configLoop(ctx log.Interface, cfgURL string) {
	ticker := time.Tick(15 * time.Second)

	for {
		select {
		case <-ticker:
			newIPs, err := dnscfg.Get(dnsAddr, ldPort)
			if err != nil {
				ctx.WithError(err).Error("dns lookup")
				continue
			}

			if len(newIPs) == 0 {
				ctx.Error("no ip addresses found")
				continue
			}

			oldIPs, err := httpcfg.Get(cfgURL)
			if err != nil {
				ctx.WithError(err).Error("getting config")
				continue
			}

			if eq(newIPs, oldIPs) {
				ctx.Info("config up to date")
				continue
			}

			err = httpcfg.Set(cfgURL, newIPs)
			if err != nil {
				ctx.WithError(err).Error("setting config")
				continue
			}

			ctx.WithField("ips", newIPs).Info("setting config")
		}
	}
}

// SetApp stores the app EUI preference
func SetAppEUI(ctx log.Interface, appEUI types.AppEUI) {
	err := setData(appFilename, euiKey, appEUI.String())
	if err != nil {
		ctx.WithError(err).Fatal("Could not save app EUI")
	}
}

// Selfupdate runs a self-update for the current binary
func Selfupdate(ctx log.Interface, component string) {
	if viper.GetString("gitBranch") == "unknown" {
		ctx.Infof("You are not using an official %s build. Not proceeding with the update", component)
		return
	}

	info, err := GetLatestInfo()
	if err != nil {
		ctx.WithError(err).Fatal("Could not get version information from the server")
	}

	if viper.GetString("gitCommit") == info.Commit {
		ctx.Info("The git commit of the build on the server is the same as yours")
		ctx.Info("Not proceeding with the update")
		return
	}

	if date, err := time.Parse(time.RFC3339, viper.GetString("buildDate")); err == nil {
		if date.Equal(info.Date) {
			ctx.Infof("You have the latest version of %s", component)
			ctx.Info("Nothing to update")
			return
		}
		if date.After(info.Date) {
			ctx.Infof("Your build is %s newer than the build on the server", date.Sub(info.Date))
			ctx.Info("Not proceeding with the update")
			return
		}
		ctx.Infof("The build on the server is %s newer than yours", info.Date.Sub(date))
	}

	ctx.Infof("Downloading the latest %s...", component)
	binary, err := GetLatest(component)
	if err != nil {
		ctx.WithError(err).Fatal("Could not download latest binary")
	}
	filename, err := osext.Executable()
	if err != nil {
		ctx.WithError(err).Fatal("Could not get path to local binary")
	}
	stat, err := os.Stat(filename)
	if err != nil {
		ctx.WithError(err).Fatal("Could not stat local binary")
	}
	ctx.Info("Replacing local binary...")
	if err := ioutil.WriteFile(filename+".new", binary, stat.Mode()); err != nil {
		ctx.WithError(err).Fatal("Could not write new binary to filesystem")
	}
	if err := os.Rename(filename, filename+".old"); err != nil {
		ctx.WithError(err).Fatal("Could not rename binary")
	}
	if err := os.Rename(filename+".new", filename); err != nil {
		ctx.WithError(err).Fatal("Could not rename binary")
	}
	ctx.Infof("Updated %s to the latest version", component)
}