Golang errors.Flatten函数代码示例

func NewCmdRolloutPause(f *cmdutil.Factory, out io.Writer) *cobra.Command {
	opts := &PauseConfig{}

	cmd := &cobra.Command{
		Use:     "pause RESOURCE",
		Short:   "Mark the provided resource as paused",
		Long:    pause_long,
		Example: pause_example,
		Run: func(cmd *cobra.Command, args []string) {
			allErrs := []error{}
			err := opts.CompletePause(f, cmd, out, args)
			if err != nil {
				allErrs = append(allErrs, err)
			}
			err = opts.RunPause()
			if err != nil {
				allErrs = append(allErrs, err)
			}
			cmdutil.CheckErr(utilerrors.Flatten(utilerrors.NewAggregate(allErrs)))
		},
	}

	usage := "Filename, directory, or URL to a file identifying the resource to get from a server."
	kubectl.AddJsonFilenameFlag(cmd, &opts.Filenames, usage)
	cmdutil.AddRecursiveFlag(cmd, &opts.Recursive)
	return cmd
}

func NewCmdRolloutUndo(f *cmdutil.Factory, out io.Writer) *cobra.Command {
	opts := &UndoOptions{}

	validArgs := []string{"deployment"}
	argAliases := kubectl.ResourceAliases(validArgs)

	cmd := &cobra.Command{
		Use:     "undo (TYPE NAME | TYPE/NAME) [flags]",
		Short:   "Undo a previous rollout",
		Long:    undo_long,
		Example: undo_example,
		Run: func(cmd *cobra.Command, args []string) {
			allErrs := []error{}
			err := opts.CompleteUndo(f, cmd, out, args)
			if err != nil {
				allErrs = append(allErrs, err)
			}
			err = opts.RunUndo()
			if err != nil {
				allErrs = append(allErrs, err)
			}
			cmdutil.CheckErr(utilerrors.Flatten(utilerrors.NewAggregate(allErrs)))
		},
		ValidArgs:  validArgs,
		ArgAliases: argAliases,
	}

	cmd.Flags().Int64("to-revision", 0, "The revision to rollback to. Default to 0 (last revision).")
	usage := "Filename, directory, or URL to a file identifying the resource to get from a server."
	kubectl.AddJsonFilenameFlag(cmd, &opts.Filenames, usage)
	cmdutil.AddRecursiveFlag(cmd, &opts.Recursive)
	return cmd
}

func NewCmdRolloutPause(f cmdutil.Factory, out io.Writer) *cobra.Command {
	options := &PauseConfig{}

	validArgs := []string{"deployment"}
	argAliases := kubectl.ResourceAliases(validArgs)

	cmd := &cobra.Command{
		Use:     "pause RESOURCE",
		Short:   "Mark the provided resource as paused",
		Long:    pause_long,
		Example: pause_example,
		Run: func(cmd *cobra.Command, args []string) {
			allErrs := []error{}
			err := options.CompletePause(f, cmd, out, args)
			if err != nil {
				allErrs = append(allErrs, err)
			}
			err = options.RunPause()
			if err != nil {
				allErrs = append(allErrs, err)
			}
			cmdutil.CheckErr(utilerrors.Flatten(utilerrors.NewAggregate(allErrs)))
		},
		ValidArgs:  validArgs,
		ArgAliases: argAliases,
	}

	usage := "identifying the resource to get from a server."
	cmdutil.AddFilenameOptionFlags(cmd, &options.FilenameOptions, usage)
	return cmd
}

func NewCmdRolloutResume(f *cmdutil.Factory, out io.Writer) *cobra.Command {
	opts := &ResumeConfig{}

	validArgs := []string{"deployment"}
	argAliases := kubectl.ResourceAliases(validArgs)

	cmd := &cobra.Command{
		Use:     "resume RESOURCE",
		Short:   "Resume a paused resource",
		Long:    resume_long,
		Example: resume_example,
		Run: func(cmd *cobra.Command, args []string) {
			allErrs := []error{}
			err := opts.CompleteResume(f, cmd, out, args)
			if err != nil {
				allErrs = append(allErrs, err)
			}
			err = opts.RunResume()
			if err != nil {
				allErrs = append(allErrs, err)
			}
			cmdutil.CheckErr(utilerrors.Flatten(utilerrors.NewAggregate(allErrs)))
		},
		ValidArgs:  validArgs,
		ArgAliases: argAliases,
	}

	usage := "Filename, directory, or URL to a file identifying the resource to get from a server."
	kubectl.AddJsonFilenameFlag(cmd, &opts.Filenames, usage)
	cmdutil.AddRecursiveFlag(cmd, &opts.Recursive)
	return cmd
}

// MultilineError returns a string representing an error that splits sub errors into their own
// lines. The returned string will end with a newline.
func MultilineError(prefix string, err error) string {
	if agg, ok := err.(utilerrors.Aggregate); ok {
		errs := utilerrors.Flatten(agg).Errors()
		buf := &bytes.Buffer{}
		switch len(errs) {
		case 0:
			return fmt.Sprintf("%s%v\n", prefix, err)
		case 1:
			return fmt.Sprintf("%s%v\n", prefix, messageForError(errs[0]))
		default:
			fmt.Fprintln(buf, prefix)
			for _, err := range errs {
				fmt.Fprintf(buf, "* %v\n", messageForError(err))
			}
			return buf.String()
		}
	}
	return fmt.Sprintf("%s%s\n", prefix, err)
}

func (c *ServiceAccountsController) syncNamespace(key string) error {
	startTime := time.Now()
	defer func() {
		glog.V(4).Infof("Finished syncing namespace %q (%v)", key, time.Now().Sub(startTime))
	}()

	ns, err := c.nsLister.Get(key)
	if apierrs.IsNotFound(err) {
		return nil
	}
	if err != nil {
		return err
	}
	if ns.Status.Phase != api.NamespaceActive {
		// If namespace is not active, we shouldn't try to create anything
		return nil
	}

	createFailures := []error{}
	for i := range c.serviceAccountsToEnsure {
		sa := c.serviceAccountsToEnsure[i]
		switch _, err := c.saLister.ServiceAccounts(ns.Name).Get(sa.Name); {
		case err == nil:
			continue
		case apierrs.IsNotFound(err):
		case err != nil:
			return err
		}
		// this is only safe because we never read it and we always write it
		// TODO eliminate this once the fake client can handle creation without NS
		sa.Namespace = ns.Name

		if _, err := c.client.Core().ServiceAccounts(ns.Name).Create(&sa); err != nil && !apierrs.IsAlreadyExists(err) {
			createFailures = append(createFailures, err)
		}
	}

	return utilerrors.Flatten(utilerrors.NewAggregate(createFailures))
}

// EnsureTCPLoadBalancerDeleted is an implementation of TCPLoadBalancer.EnsureTCPLoadBalancerDeleted.
func (gce *GCECloud) EnsureTCPLoadBalancerDeleted(name, region string) error {
	err := errors.AggregateGoroutines(
		func() error { return gce.deleteFirewall(name, region) },
		// Even though we don't hold on to static IPs for load balancers, it's
		// possible that EnsureTCPLoadBalancer left one around in a failed
		// creation/update attempt, so make sure we clean it up here just in case.
		func() error { return gce.deleteStaticIP(name, region) },
		func() error {
			// The forwarding rule must be deleted before either the target pool can,
			// unfortunately, so we have to do these two serially.
			if err := gce.deleteForwardingRule(name, region); err != nil {
				return err
			}
			if err := gce.deleteTargetPool(name, region); err != nil {
				return err
			}
			return nil
		},
	)
	if err != nil {
		return errors.Flatten(err)
	}
	return nil
}

// EnsureTCPLoadBalancerDeleted is an implementation of TCPLoadBalancer.EnsureTCPLoadBalancerDeleted.
func (gce *GCECloud) EnsureTCPLoadBalancerDeleted(name, region string) error {
	err := errors.AggregateGoroutines(
		func() error { return gce.deleteFirewall(name, region) },
		func() error {
			if err := gce.deleteForwardingRule(name, region); err != nil {
				return err
			}
			// The forwarding rule must be deleted before either the target pool or
			// static IP address can, unfortunately.
			err := errors.AggregateGoroutines(
				func() error { return gce.deleteTargetPool(name, region) },
				func() error { return gce.deleteStaticIP(name, region) },
			)
			if err != nil {
				return err
			}
			return nil
		},
	)
	if err != nil {
		return errors.Flatten(err)
	}
	return nil
}

// EnsureLoadBalancer creates a new load balancer 'name', or updates the existing one. Returns the status of the balancer
func (az *Cloud) EnsureLoadBalancer(clusterName string, service *v1.Service, nodeNames []string) (*v1.LoadBalancerStatus, error) {
	lbName := getLoadBalancerName(clusterName)
	pipName := getPublicIPName(clusterName, service)
	serviceName := getServiceName(service)
	glog.V(2).Infof("ensure(%s): START clusterName=%q lbName=%q", serviceName, clusterName, lbName)

	pip, err := az.ensurePublicIPExists(serviceName, pipName)
	if err != nil {
		return nil, err
	}

	sg, err := az.SecurityGroupsClient.Get(az.ResourceGroup, az.SecurityGroupName, "")
	if err != nil {
		return nil, err
	}
	sg, sgNeedsUpdate, err := az.reconcileSecurityGroup(sg, clusterName, service)
	if err != nil {
		return nil, err
	}
	if sgNeedsUpdate {
		glog.V(3).Infof("ensure(%s): sg(%s) - updating", serviceName, *sg.Name)
		_, err := az.SecurityGroupsClient.CreateOrUpdate(az.ResourceGroup, *sg.Name, sg, nil)
		if err != nil {
			return nil, err
		}
	}

	lb, existsLb, err := az.getAzureLoadBalancer(lbName)
	if err != nil {
		return nil, err
	}
	if !existsLb {
		lb = network.LoadBalancer{
			Name:       &lbName,
			Location:   &az.Location,
			Properties: &network.LoadBalancerPropertiesFormat{},
		}
	}

	lb, lbNeedsUpdate, err := az.reconcileLoadBalancer(lb, pip, clusterName, service, nodeNames)
	if err != nil {
		return nil, err
	}
	if !existsLb || lbNeedsUpdate {
		glog.V(3).Infof("ensure(%s): lb(%s) - updating", serviceName, lbName)
		_, err = az.LoadBalancerClient.CreateOrUpdate(az.ResourceGroup, *lb.Name, lb, nil)
		if err != nil {
			return nil, err
		}
	}

	// Add the machines to the backend pool if they're not already
	lbBackendName := getBackendPoolName(clusterName)
	lbBackendPoolID := az.getBackendPoolID(lbName, lbBackendName)
	hostUpdates := make([]func() error, len(nodeNames))
	for i, nodeName := range nodeNames {
		localNodeName := nodeName
		f := func() error {
			err := az.ensureHostInPool(serviceName, types.NodeName(localNodeName), lbBackendPoolID)
			if err != nil {
				return fmt.Errorf("ensure(%s): lb(%s) - failed to ensure host in pool: %q", serviceName, lbName, err)
			}
			return nil
		}
		hostUpdates[i] = f
	}

	errs := utilerrors.AggregateGoroutines(hostUpdates...)
	if errs != nil {
		return nil, utilerrors.Flatten(errs)
	}

	glog.V(2).Infof("ensure(%s): FINISH - %s", serviceName, *pip.Properties.IPAddress)
	return &v1.LoadBalancerStatus{
		Ingress: []v1.LoadBalancerIngress{{IP: *pip.Properties.IPAddress}},
	}, nil
}

//.........这里部分代码省略.........
		}

		first := true
		filteredResourceCount = 0
		intr := interrupt.New(nil, w.Stop)
		intr.Run(func() error {
			_, err := watch.Until(0, w, func(e watch.Event) (bool, error) {
				if !isList && first {
					// drop the initial watch event in the single resource case
					first = false
					return false, nil
				}
				err := printer.PrintObj(e.Object, out)
				if err != nil {
					return false, err
				}
				filteredResourceCount++
				cmdutil.PrintFilterCount(filteredResourceCount, mapping.Resource, filterOpts)
				return false, nil
			})
			return err
		})
		return nil
	}

	r := resource.NewBuilder(mapper, typer, resource.ClientMapperFunc(f.UnstructuredClientForMapping), runtime.UnstructuredJSONScheme).
		NamespaceParam(cmdNamespace).DefaultNamespace().AllNamespaces(allNamespaces).
		FilenameParam(enforceNamespace, &options.FilenameOptions).
		SelectorParam(selector).
		ExportParam(export).
		ResourceTypeOrNameArgs(true, args...).
		ContinueOnError().
		Latest().
		Flatten().
		Do()
	err = r.Err()
	if err != nil {
		return err
	}

	printer, generic, err := cmdutil.PrinterForCommand(cmd)
	if err != nil {
		return err
	}

	if generic {
		// we flattened the data from the builder, so we have individual items, but now we'd like to either:
		// 1. if there is more than one item, combine them all into a single list
		// 2. if there is a single item and that item is a list, leave it as its specific list
		// 3. if there is a single item and it is not a a list, leave it as a single item
		var errs []error
		singular := false
		infos, err := r.IntoSingular(&singular).Infos()
		if err != nil {
			if singular {
				return err
			}
			errs = append(errs, err)
		}
		if len(infos) == 0 && len(errs) == 0 {
			outputEmptyListWarning(errOut)
		}

		res := ""
		if len(infos) > 0 {
			res = infos[0].ResourceMapping().Resource

//.........这里部分代码省略.........
		}

		first := true
		filteredResourceCount = 0
		intr := interrupt.New(nil, w.Stop)
		intr.Run(func() error {
			_, err := watch.Until(0, w, func(e watch.Event) (bool, error) {
				if !isList && first {
					// drop the initial watch event in the single resource case
					first = false
					return false, nil
				}
				err := printer.PrintObj(e.Object, out)
				if err != nil {
					return false, err
				}
				filteredResourceCount++
				cmdutil.PrintFilterCount(filteredResourceCount, mapping.Resource, errOut, filterOpts)
				return false, nil
			})
			return err
		})
		return nil
	}

	r := resource.NewBuilder(mapper, typer, resource.ClientMapperFunc(f.ClientForMapping), f.Decoder(true)).
		NamespaceParam(cmdNamespace).DefaultNamespace().AllNamespaces(allNamespaces).
		FilenameParam(enforceNamespace, &options.FilenameOptions).
		SelectorParam(selector).
		ExportParam(export).
		ResourceTypeOrNameArgs(true, args...).
		ContinueOnError().
		Latest().
		Flatten().
		Do()
	err = r.Err()
	if err != nil {
		return err
	}

	printer, generic, err := cmdutil.PrinterForCommand(cmd)
	if err != nil {
		return err
	}

	if generic {
		clientConfig, err := f.ClientConfig()
		if err != nil {
			return err
		}

		// the outermost object will be converted to the output-version, but inner
		// objects can use their mappings
		version, err := cmdutil.OutputVersion(cmd, clientConfig.GroupVersion)
		if err != nil {
			return err
		}

		var errs []error
		singular := false
		infos, err := r.IntoSingular(&singular).Infos()
		if err != nil {
			if singular {
				return err
			}
			errs = append(errs, err)

// RunGet implements the generic Get command
// TODO: convert all direct flag accessors to a struct and pass that instead of cmd
func RunGet(f *cmdutil.Factory, out io.Writer, cmd *cobra.Command, args []string, options *GetOptions) error {
	selector := cmdutil.GetFlagString(cmd, "selector")
	allNamespaces := cmdutil.GetFlagBool(cmd, "all-namespaces")
	mapper, typer := f.Object(cmdutil.GetIncludeThirdPartyAPIs(cmd))

	cmdNamespace, enforceNamespace, err := f.DefaultNamespace()
	if err != nil {
		return err
	}

	if allNamespaces {
		enforceNamespace = false
	}

	if len(args) == 0 && len(options.Filenames) == 0 {
		fmt.Fprint(out, "You must specify the type of resource to get. ", valid_resources)
		return cmdutil.UsageError(cmd, "Required resource not specified.")
	}

	// always show resources when getting by name or filename
	argsHasNames, err := resource.HasNames(args)
	if err != nil {
		return err
	}
	if len(options.Filenames) > 0 || argsHasNames {
		cmd.Flag("show-all").Value.Set("true")
	}
	export := cmdutil.GetFlagBool(cmd, "export")

	// handle watch separately since we cannot watch multiple resource types
	isWatch, isWatchOnly := cmdutil.GetFlagBool(cmd, "watch"), cmdutil.GetFlagBool(cmd, "watch-only")
	if isWatch || isWatchOnly {
		r := resource.NewBuilder(mapper, typer, resource.ClientMapperFunc(f.ClientForMapping), f.Decoder(true)).
			NamespaceParam(cmdNamespace).DefaultNamespace().AllNamespaces(allNamespaces).
			FilenameParam(enforceNamespace, options.Recursive, options.Filenames...).
			SelectorParam(selector).
			ExportParam(export).
			ResourceTypeOrNameArgs(true, args...).
			SingleResourceType().
			Latest().
			Do()
		err := r.Err()
		if err != nil {
			return err
		}
		infos, err := r.Infos()
		if err != nil {
			return err
		}
		if len(infos) != 1 {
			return fmt.Errorf("watch is only supported on individual resources and resource collections - %d resources were found", len(infos))
		}
		info := infos[0]
		mapping := info.ResourceMapping()
		printer, err := f.PrinterForMapping(cmd, mapping, allNamespaces)
		if err != nil {
			return err
		}

		obj, err := r.Object()
		if err != nil {
			return err
		}
		rv, err := mapping.MetadataAccessor.ResourceVersion(obj)
		if err != nil {
			return err
		}

		// print the current object
		if !isWatchOnly {
			if err := printer.PrintObj(obj, out); err != nil {
				return fmt.Errorf("unable to output the provided object: %v", err)
			}
		}

		// print watched changes
		w, err := r.Watch(rv)
		if err != nil {
			return err
		}

		kubectl.WatchLoop(w, func(e watch.Event) error {
			return printer.PrintObj(e.Object, out)
		})
		return nil
	}

	r := resource.NewBuilder(mapper, typer, resource.ClientMapperFunc(f.ClientForMapping), f.Decoder(true)).
		NamespaceParam(cmdNamespace).DefaultNamespace().AllNamespaces(allNamespaces).
		FilenameParam(enforceNamespace, options.Recursive, options.Filenames...).
		SelectorParam(selector).
		ExportParam(export).
		ResourceTypeOrNameArgs(true, args...).
		ContinueOnError().
		Latest().
		Flatten().
		Do()
	err = r.Err()
//.........这里部分代码省略.........