Golang API.Exists方法代碼示例

// StartHost starts a host VM.
func StartHost(api libmachine.API, config MachineConfig) (*host.Host, error) {
	exists, err := api.Exists(constants.MachineName)
	if err != nil {
		return nil, errors.Wrapf(err, "Error checking if host exists: %s", constants.MachineName)
	}
	if !exists {
		return createHost(api, config)
	}

	glog.Infoln("Machine exists!")
	h, err := api.Load(constants.MachineName)
	if err != nil {
		return nil, errors.Wrap(err, "Error loading existing host. Please try running [minikube delete], then run [minikube start] again.")
	}

	s, err := h.Driver.GetState()
	glog.Infoln("Machine state: ", s)
	if err != nil {
		return nil, errors.Wrap(err, "Error getting state for host")
	}

	if s != state.Running {
		if err := h.Driver.Start(); err != nil {
			return nil, errors.Wrapf(err, "Error starting stopped host")
		}
		if err := api.Save(h); err != nil {
			return nil, errors.Wrapf(err, "Error saving started host")
		}
	}

	if err := h.ConfigureAuth(); err != nil {
		return nil, errors.Wrap(err, "Error configuring auth on host: %s")
	}
	return h, nil
}

// StartHost starts a host VM.
func StartHost(api libmachine.API, config MachineConfig) (*host.Host, error) {
	if exists, err := api.Exists(constants.MachineName); err != nil {
		return nil, fmt.Errorf("Error checking if host exists: %s", err)
	} else if exists {
		glog.Infoln("Machine exists!")
		h, err := api.Load(constants.MachineName)
		if err != nil {
			return nil, fmt.Errorf("Error loading existing host: %s", err)
		}
		s, err := h.Driver.GetState()
		if err != nil {
			return nil, fmt.Errorf("Error getting state for host: %s", err)
		}
		if s != state.Running {
			if err := h.Driver.Start(); err != nil {
				return nil, fmt.Errorf("Error starting stopped host: %s", err)
			}
			if err := api.Save(h); err != nil {
				return nil, fmt.Errorf("Error saving started host: %s", err)
			}
		}
		return h, nil
	} else {
		return createHost(api, config)
	}
}

func removeLocalMachine(hostName string, api libmachine.API) error {
	exist, _ := api.Exists(hostName)
	if !exist {
		return errors.New(hostName + " does not exist.")
	}
	return api.Remove(hostName)
}

// Remove removes a Docker Machine
func Remove(api libmachine.API, args map[string]string, form map[string][]string) (interface{}, error) {
	name, present := args["name"]
	if !present {
		return nil, errRequireMachineName
	}

	exist, _ := api.Exists(name)
	if !exist {
		return Success{"removed", name}, nil
	}

	currentHost, err := api.Load(name)
	if err != nil {
		return nil, err
	}

	if err := currentHost.Driver.Remove(); err != nil {
		return nil, err
	}

	if err := api.Remove(name); err != nil {
		return nil, err
	}

	return Success{"removed", name}, nil
}

func checkIfApiExistsAndLoad(api libmachine.API) (*host.Host, error) {
	exists, err := api.Exists(constants.MachineName)
	if err != nil {
		return nil, errors.Wrapf(err, "Error checking that api exists for: ", constants.MachineName)
	}
	if !exists {
		return nil, errors.Errorf("Machine does not exist for api.Exists(%s)", constants.MachineName)
	}

	host, err := api.Load(constants.MachineName)
	if err != nil {
		return nil, errors.Wrapf(err, "Error loading api for: ", constants.MachineName)
	}
	return host, nil
}

func checkIfApiExistsAndLoad(api libmachine.API) (*host.Host, error) {
	exists, err := api.Exists(constants.MachineName)
	if err != nil {
		return nil, err
	}
	if !exists {
		return nil, fmt.Errorf("Machine does not exist for api.Exists(%s)", constants.MachineName)
	}

	host, err := api.Load(constants.MachineName)
	if err != nil {
		return nil, err
	}
	return host, nil
}

// targetHost returns a specific host name if one is indicated by the first CLI
// arg, or the default host name if no host is specified.
func targetHost(c CommandLine, api libmachine.API) (string, error) {
	if len(c.Args()) == 0 {
		defaultExists, err := api.Exists(defaultMachineName)
		if err != nil {
			return "", fmt.Errorf("Error checking if host %q exists: %s", defaultMachineName, err)
		}

		if defaultExists {
			return defaultMachineName, nil
		}

		return "", ErrNoDefault
	}

	return c.Args()[0], nil
}

// GetHostStatus gets the status of the host VM.
func GetHostStatus(api libmachine.API) (string, error) {
	dne := "Does Not Exist"
	exists, err := api.Exists(constants.MachineName)
	if err != nil {
		return "", err
	}
	if !exists {
		return dne, nil
	}

	host, err := api.Load(constants.MachineName)
	if err != nil {
		return "", err
	}

	s, err := host.Driver.GetState()
	if s.String() == "" {
		return dne, err
	}
	return s.String(), err
}

// GetHostStatus gets the status of the host VM.
func GetHostStatus(api libmachine.API) (string, error) {
	dne := "Does Not Exist"
	exists, err := api.Exists(constants.MachineName)
	if err != nil {
		return "", errors.Wrapf(err, "Error checking that api exists for: ", constants.MachineName)
	}
	if !exists {
		return dne, nil
	}

	host, err := api.Load(constants.MachineName)
	if err != nil {
		return "", errors.Wrapf(err, "Error loading api for: ", constants.MachineName)
	}

	s, err := host.Driver.GetState()
	if s.String() == "" {
		return dne, nil
	}
	if err != nil {
		return "", errors.Wrap(err, "Error getting host state")
	}
	return s.String(), nil
}

func cmdCreateInner(c CommandLine, api libmachine.API) error {
	if len(c.Args()) > 1 {
		return fmt.Errorf("Invalid command line. Found extra arguments %v", c.Args()[1:])
	}

	name := c.Args().First()
	if name == "" {
		c.ShowHelp()
		return errNoMachineName
	}

	validName := host.ValidateHostName(name)
	if !validName {
		return fmt.Errorf("Error creating machine: %s", mcnerror.ErrInvalidHostname)
	}

	if err := validateSwarmDiscovery(c.String("swarm-discovery")); err != nil {
		return fmt.Errorf("Error parsing swarm discovery: %s", err)
	}

	// TODO: Fix hacky JSON solution
	rawDriver, err := json.Marshal(&drivers.BaseDriver{
		MachineName: name,
		StorePath:   c.GlobalString("storage-path"),
	})
	if err != nil {
		return fmt.Errorf("Error attempting to marshal bare driver data: %s", err)
	}

	driverName := c.String("driver")
	h, err := api.NewHost(driverName, rawDriver)
	if err != nil {
		return fmt.Errorf("Error getting new host: %s", err)
	}

	h.HostOptions = &host.Options{
		AuthOptions: &auth.Options{
			CertDir:          mcndirs.GetMachineCertDir(),
			CaCertPath:       tlsPath(c, "tls-ca-cert", "ca.pem"),
			CaPrivateKeyPath: tlsPath(c, "tls-ca-key", "ca-key.pem"),
			ClientCertPath:   tlsPath(c, "tls-client-cert", "cert.pem"),
			ClientKeyPath:    tlsPath(c, "tls-client-key", "key.pem"),
			ServerCertPath:   filepath.Join(mcndirs.GetMachineDir(), name, "server.pem"),
			ServerKeyPath:    filepath.Join(mcndirs.GetMachineDir(), name, "server-key.pem"),
			StorePath:        filepath.Join(mcndirs.GetMachineDir(), name),
			ServerCertSANs:   c.StringSlice("tls-san"),
		},
		EngineOptions: &engine.Options{
			ArbitraryFlags:   c.StringSlice("engine-opt"),
			Env:              c.StringSlice("engine-env"),
			InsecureRegistry: c.StringSlice("engine-insecure-registry"),
			Labels:           c.StringSlice("engine-label"),
			RegistryMirror:   c.StringSlice("engine-registry-mirror"),
			StorageDriver:    c.String("engine-storage-driver"),
			TLSVerify:        true,
			InstallURL:       c.String("engine-install-url"),
		},
		SwarmOptions: &swarm.Options{
			IsSwarm:            c.Bool("swarm") || c.Bool("swarm-master"),
			Image:              c.String("swarm-image"),
			Agent:              c.Bool("swarm"),
			Master:             c.Bool("swarm-master"),
			Discovery:          c.String("swarm-discovery"),
			Address:            c.String("swarm-addr"),
			Host:               c.String("swarm-host"),
			Strategy:           c.String("swarm-strategy"),
			ArbitraryFlags:     c.StringSlice("swarm-opt"),
			ArbitraryJoinFlags: c.StringSlice("swarm-join-opt"),
			IsExperimental:     c.Bool("swarm-experimental"),
		},
	}

	exists, err := api.Exists(h.Name)
	if err != nil {
		return fmt.Errorf("Error checking if host exists: %s", err)
	}
	if exists {
		return mcnerror.ErrHostAlreadyExists{
			Name: h.Name,
		}
	}

	// driverOpts is the actual data we send over the wire to set the
	// driver parameters (an interface fulfilling drivers.DriverOptions,
	// concrete type rpcdriver.RpcFlags).
	mcnFlags := h.Driver.GetCreateFlags()
	driverOpts := getDriverOpts(c, mcnFlags)

	if err := h.Driver.SetConfigFromFlags(driverOpts); err != nil {
		return fmt.Errorf("Error setting machine configuration from flags provided: %s", err)
	}

	if err := api.Create(h); err != nil {
		// Wait for all the logs to reach the client
		time.Sleep(2 * time.Second)

		vBoxLog := ""
		if h.DriverName == "virtualbox" {
			vBoxLog = filepath.Join(api.GetMachinesDir(), h.Name, h.Name, "Logs", "VBox.log")
		}
//.........這裏部分代碼省略.........

// Exists tells whether a named host exists.
func Exists(api libmachine.API, name string) bool {
	exists, _ := api.Exists(name)
	return exists
}

func cmdCreateInner(c CommandLine, api libmachine.API) error {
	if len(c.Args()) > 1 {
		return fmt.Errorf("Invalid command line. Found extra arguments %v", c.Args()[1:])
	}

	name := c.Args().First()
	if name == "" {
		c.ShowHelp()
		return errNoMachineName
	}

	validName := host.ValidateHostName(name)
	if !validName {
		return fmt.Errorf("Error creating machine: %s", mcnerror.ErrInvalidHostname)
	}

	if err := validateSwarmDiscovery(c.String("swarm-discovery")); err != nil {
		return fmt.Errorf("Error parsing swarm discovery: %s", err)
	}

	// TODO: Fix hacky JSON solution
	rawDriver, err := json.Marshal(&drivers.BaseDriver{
		MachineName: name,
		StorePath:   c.GlobalString("storage-path"),
	})
	if err != nil {
		return fmt.Errorf("Error attempting to marshal bare driver data: %s", err)
	}

	driverName := c.String("driver")
	driver, err := api.NewPluginDriver(driverName, rawDriver)
	if err != nil {
		return fmt.Errorf("Error loading driver %q: %s", driverName, err)
	}

	h, err := api.NewHost(driver)
	if err != nil {
		return fmt.Errorf("Error getting new host: %s", err)
	}

	certInfo := getCertPathInfoFromCommandLine(c)

	h.HostOptions = &host.Options{
		AuthOptions: &auth.Options{
			CertDir:          mcndirs.GetMachineCertDir(),
			CaCertPath:       certInfo.CaCertPath,
			CaPrivateKeyPath: certInfo.CaPrivateKeyPath,
			ClientCertPath:   certInfo.ClientCertPath,
			ClientKeyPath:    certInfo.ClientKeyPath,
			ServerCertPath:   filepath.Join(mcndirs.GetMachineDir(), name, "server.pem"),
			ServerKeyPath:    filepath.Join(mcndirs.GetMachineDir(), name, "server-key.pem"),
			StorePath:        filepath.Join(mcndirs.GetMachineDir(), name),
			ServerCertSANs:   c.StringSlice("tls-san"),
		},
		EngineOptions: &engine.Options{
			ArbitraryFlags:   c.StringSlice("engine-opt"),
			Env:              c.StringSlice("engine-env"),
			InsecureRegistry: c.StringSlice("engine-insecure-registry"),
			Labels:           c.StringSlice("engine-label"),
			RegistryMirror:   c.StringSlice("engine-registry-mirror"),
			StorageDriver:    c.String("engine-storage-driver"),
			TLSVerify:        true,
			InstallURL:       c.String("engine-install-url"),
		},
		SwarmOptions: &swarm.Options{
			IsSwarm:        c.Bool("swarm"),
			Image:          c.String("swarm-image"),
			Master:         c.Bool("swarm-master"),
			Discovery:      c.String("swarm-discovery"),
			Address:        c.String("swarm-addr"),
			Host:           c.String("swarm-host"),
			Strategy:       c.String("swarm-strategy"),
			ArbitraryFlags: c.StringSlice("swarm-opt"),
		},
	}

	exists, err := api.Exists(h.Name)
	if err != nil {
		return fmt.Errorf("Error checking if host exists: %s", err)
	}
	if exists {
		return mcnerror.ErrHostAlreadyExists{
			Name: h.Name,
		}
	}

	// driverOpts is the actual data we send over the wire to set the
	// driver parameters (an interface fulfilling drivers.DriverOptions,
	// concrete type rpcdriver.RpcFlags).
	mcnFlags := driver.GetCreateFlags()
	driverOpts := getDriverOpts(c, mcnFlags)

	if err := h.Driver.SetConfigFromFlags(driverOpts); err != nil {
		return fmt.Errorf("Error setting machine configuration from flags provided: %s", err)
	}

	if err := api.Create(h); err != nil {
		return fmt.Errorf("Error creating machine: %s", err)
	}

//.........這裏部分代碼省略.........

func createMachine(api libmachine.API, name string, driver string, form map[string][]string) error {
	validName := host.ValidateHostName(name)
	if !validName {
		return fmt.Errorf("Error creating machine: %s", mcnerror.ErrInvalidHostname)
	}

	exists, err := api.Exists(name)
	if err != nil {
		return fmt.Errorf("Error checking if host exists: %s", err)
	}
	if exists {
		return mcnerror.ErrHostAlreadyExists{
			Name: name,
		}
	}

	rawDriver, err := json.Marshal(&drivers.BaseDriver{
		MachineName: name,
		StorePath:   mcndirs.GetBaseDir(),
	})
	if err != nil {
		return fmt.Errorf("Error attempting to marshal bare driver data: %s", err)
	}

	h, err := api.NewHost(driver, rawDriver)
	if err != nil {
		return err
	}

	globalOpts := globalFlags{
		flags: form,
	}

	h.HostOptions = &host.Options{
		AuthOptions: &auth.Options{
			CertDir:          mcndirs.GetMachineCertDir(),
			CaCertPath:       filepath.Join(mcndirs.GetMachineCertDir(), "ca.pem"),
			CaPrivateKeyPath: filepath.Join(mcndirs.GetMachineCertDir(), "ca-key.pem"),
			ClientCertPath:   filepath.Join(mcndirs.GetMachineCertDir(), "cert.pem"),
			ClientKeyPath:    filepath.Join(mcndirs.GetMachineCertDir(), "key.pem"),
			ServerCertPath:   filepath.Join(mcndirs.GetMachineDir(), name, "server.pem"),
			ServerKeyPath:    filepath.Join(mcndirs.GetMachineDir(), name, "server-key.pem"),
			StorePath:        filepath.Join(mcndirs.GetMachineDir(), name),
			ServerCertSANs:   globalOpts.StringSlice("tls-san"),
		},
		EngineOptions: &engine.Options{
			ArbitraryFlags:   globalOpts.StringSlice("engine-opt"),
			Env:              globalOpts.StringSlice("engine-env"),
			InsecureRegistry: globalOpts.StringSlice("engine-insecure-registry"),
			Labels:           globalOpts.StringSlice("engine-label"),
			RegistryMirror:   globalOpts.StringSlice("engine-registry-mirror"),
			StorageDriver:    globalOpts.String("engine-storage-driver"),
			TLSVerify:        true,
			InstallURL:       globalOpts.String("engine-install-url"),
		},
		SwarmOptions: &swarm.Options{
			IsSwarm:        globalOpts.Bool("swarm"),
			Image:          globalOpts.String("swarm-image"),
			Master:         globalOpts.Bool("swarm-master"),
			Discovery:      globalOpts.String("swarm-discovery"),
			Address:        globalOpts.String("swarm-addr"),
			Host:           globalOpts.String("swarm-host"),
			Strategy:       globalOpts.String("swarm-strategy"),
			ArbitraryFlags: globalOpts.StringSlice("swarm-opt"),
			IsExperimental: globalOpts.Bool("swarm-experimental"),
		},
	}

	mcnFlags := h.Driver.GetCreateFlags()
	opts, err := parseFlags(form, mcnFlags, commands.SharedCreateFlags)
	if err != nil {
		return err
	}

	if err := h.Driver.SetConfigFromFlags(opts); err != nil {
		return fmt.Errorf("Error setting machine configuration from flags provided: %s", err)
	}

	if err := api.Create(h); err != nil {
		return err
	}

	if err := api.Save(h); err != nil {
		return fmt.Errorf("Error attempting to save store: %s", err)
	}

	return nil
}