utils

package
v2.11.16 Latest Latest
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 Go to latest Published: Feb 17, 2023 License: Apache-2.0 Imports: 26 Imported by: 0

Documentation

Index

Examples

Constants

This section is empty.

Variables

View Source 
var (
	// WarningColor is the color to use for warnings.
	WarningColor = color.New(color.FgHiYellow, color.Bold)
	// Warnf behaves like Sprintf for a warning color.
	Warnf = WarningColor.Sprintf
	// Heading is the color for headings.
	Heading = color.New(color.FgWhite, color.Bold)
	// Muted is the color for headings you want muted.
	Muted = color.New(color.FgBlue)
	// TipColor is the color to show for tips.
	TipColor = color.New(color.FgGreen, color.Bold)
)

Functions

func AssertJSONMap 

func AssertJSONMap(jsonString []byte) (json.RawMessage, error)

AssertJSONMap asserts that the string is a JSON map.

func ConfigError 

func ConfigError(err error) bool

ConfigError returns true if the error is due to user error.

func CreateProxy 

func CreateProxy(w io.Writer, host, gateway string, overrideHeader http.Header) *httputil.ReverseProxy

CreateProxy creates a proxy to the specified gateway with the specified host in the request header.

func CreateProxyDirector 

func CreateProxyDirector(host, gateway string, overrideHeader http.Header) func(*http.Request)

CreateProxyDirector creates a function that modifies requests being sent to a http.RoundTripper so the request is redirected to an IP other than what the domain specifies.

Example 
director := CreateProxyDirector("my-app.example.com", "kf.proxy.gateway", http.Header{
	resources.KfAppMatchHeader: []string{"my-app"},
})

req, err := http.NewRequest(http.MethodGet, "http://my-app.example.com/foo", nil)
if err != nil {
	panic(err)
}

director(req)

fmt.Println("URL:", req.URL.String())
fmt.Println("Host:", req.Host)
fmt.Println("Header:", req.Header)

Output:

URL: http://kf.proxy.gateway/foo
Host: my-app.example.com
Header: map[X-Kf-App:[my-app]]

func ExperimentalCommandGroup 

func ExperimentalCommandGroup(name string, cmds ...*cobra.Command) group.CommandGroup

ExperimentalCommandGroup returns a CommandGroup that has a [EXPERIMENTAL] prefix. It will alter each command to have a PersistentPreRunE that notes that it is an experiment.

func JoinHeredoc 

func JoinHeredoc(docstrings ...string) string

JoinHeredoc joins documentation that was defined in-line by removing leading whitespace and joining blocks of text with two newlines.

Example 
fmt.Println(JoinHeredoc(`List:

		* a
		* b
		* c
		`, // normal documentation with indentation.
	"NOTE: single line of text.",
	`



		`, // blank lines get ignored
))

Output:

List:

* a
* b
* c

NOTE: single line of text.

func NewPrefixFilter 

func NewPrefixFilter(prefixes map[string]io.Writer, defaultWriter io.Writer) io.Writer

func ParseJSONOrFile 

func ParseJSONOrFile(jsonOrFile string) (json.RawMessage, error)

ParseJSONOrFile parses the value as JSON if it's valid or else it tries to read the value as a file on the filesystem.

func PreviewCommandGroup 

func PreviewCommandGroup(name string, cmds ...*cobra.Command) group.CommandGroup

PreviewCommandGroup returns a CommandGroup that has a [PREVIEW] prefix. It will alter each command to have a PersistentPreRunE that notes that it is in preview.

func PrintCurlExamples 

func PrintCurlExamples(ctx context.Context, listener net.Listener, host, gateway string)

PrintCurlExamples lists example HTTP requests the user can send.

func PrintCurlExamplesNoListener 

func PrintCurlExamplesNoListener(ctx context.Context, host, gateway string)

PrintCurlExamplesNoListener prints CURL examples against the real gateway.

func PrintNextActions 

func PrintNextActions(w io.Writer)

PrintNextActions prints all the available next actions and clears their values.

func SplitTags 

func SplitTags(tagsStr string) []string

SplitTags parses a string of tags into a list by splitting the string by whitespace and commas.

func StatusUpdateConditionReporter added in v2.11.16 

func StatusUpdateConditionReporter(w io.Writer) func(message string)

StatusUpdateConditionReporter creates a function that prints deltas between two status updates.

Example 
reporter := StatusUpdateConditionReporter(os.Stdout)

reporter("Foo")
reporter("Bar")
reporter("Bar")

// Expected: [status update] Foo
// [status update] Bar

Output:

func SuggestNextAction 

func SuggestNextAction(t NextAction)

SuggestNextAction adds a next action to take to the global list of next actions.

Example 
SuggestNextAction(NextAction{
	Description: "View logs",
	Commands: []string{
		"kf logs my-app",
	},
})

PrintNextActions(os.Stdout)

Output:

TIP: These other commands could be useful:
View logs:  kf logs my-app
Example (Duplicate) 
for i := 0; i < 10; i++ {
	SuggestNextAction(NextAction{
		Description: "View logs",
		Commands: []string{
			"kf logs my-app",
		},
	})
}

PrintNextActions(os.Stdout)

Output:

TIP: These other commands could be useful:
View logs:  kf logs my-app

Types

type AsyncFlags 

type AsyncFlags struct {
	// contains filtered or unexported fields
}

AsyncFlags is a flag set for managing whether or not a command runs asynchronously.

Example 
var async AsyncFlags

cmd := &cobra.Command{
	Run: func(cmd *cobra.Command, args []string) {
		fmt.Println("Running async?", async.IsAsync())
	},
}
async.Add(cmd)

cmd.SetArgs([]string{})
cmd.ExecuteC()

cmd.SetArgs([]string{"--async"})
cmd.ExecuteC()

Output:

Running async? false
Running async? true

func (*AsyncFlags) Add 

func (flags *AsyncFlags) Add(cmd *cobra.Command)

Add adds the async flag to the Cobra command.

func (*AsyncFlags) AwaitAndLog 

func (flags *AsyncFlags) AwaitAndLog(w io.Writer, action string, callback func() error) error

AwaitAndLog waits for the action to be completed if the flag specifies the command should run synchronously. In either case, it will notify the user of the decision by logging to the writer whether it waited or not. If an error is returned by the callback the result will be an error, otherwise the error will be nil.

func (*AsyncFlags) IsAsync 

func (flags *AsyncFlags) IsAsync() bool

IsAsync returns true if the user wanted the operation to run asynchronously.

func (*AsyncFlags) IsSynchronous 

func (flags *AsyncFlags) IsSynchronous() bool

IsSynchronous returns true if the user wants the operation to be completed synchronously.

Example 
var async AsyncFlags

cmd := &cobra.Command{
	Run: func(cmd *cobra.Command, args []string) {
		fmt.Println("Running sync?", async.IsSynchronous())
	},
}
async.Add(cmd)

cmd.SetArgs([]string{})
cmd.ExecuteC()

cmd.SetArgs([]string{"--async"})
cmd.ExecuteC()

Output:

Running sync? true
Running sync? false

func (*AsyncFlags) WaitFor 

func (flags *AsyncFlags) WaitFor(
	ctx context.Context,
	w io.Writer,
	action string,
	interval time.Duration,
	callback func() (bool, error),
) error

WaitFor waits for the action to be completed (signified by the callback returning true) if the flag specifies the command should be run synchronously. In either case, it will notify the user of the decision by logging to the writer whether it waited or not. If an error is returned by the callback the result will be an error, otherwise the error will be nil.

type Config 

type Config struct {
	Namespace   string
	Args        []string
	AllArgs     []string
	Flags       map[string][]string
	SourceImage string
	Stdout      io.Writer
	Stderr      io.Writer
}

func InBuildParseConfig 

func InBuildParseConfig() Config

InBuildParseConfig is used by container images that parse args and flags.

type ConfigErr 

type ConfigErr struct {
	// Reason holds the error message.
	Reason string
}

ConfigErr is used to indicate that the returned error is due to a user's invalid configuration.

func (ConfigErr) Error 

func (e ConfigErr) Error() string

Error implements error.

type KfPrintFlags 

type KfPrintFlags struct {
	*genericclioptions.PrintFlags
}

KfPrintFlags adapts changes that have to be made to Kubernetes' PrintFlags to work with Kf's documentation and style guidelines.

func NewKfPrintFlags 

func NewKfPrintFlags() *KfPrintFlags

NewKfPrintFlags creates a new KfPrintFlags.

Example 
cmd := &cobra.Command{}
cmd.Flags().SortFlags = true

printFlags := NewKfPrintFlags()
printFlags.AddFlags(cmd)

cmd.Flags().VisitAll(func(flag *pflag.Flag) {
	fmt.Println(flag.Name, " ", flag.Usage)
})

// XXX: Kf expects determinstic output for these flags.

Output:

allow-missing-template-keys   If true, ignore any errors in templates when a field or map key is missing in the template. Only applies to golang and jsonpath output formats.
output   Output format. One of: go-template|go-template-file|json|jsonpath|jsonpath-as-json|jsonpath-file|name|template|templatefile|yaml.
show-managed-fields   If true, keep the managedFields when printing objects in JSON or YAML format.
template   Template string or path to template file to use when -o=go-template, -o=go-template-file. The template format is [golang templates](http://golang.org/pkg/text/template/#pkg-overview).

func (*KfPrintFlags) AddFlags 

func (f *KfPrintFlags) AddFlags(cmd *cobra.Command)

AddFlags overrides genericclioptions.PrintFlags::AddFlags.

type NextAction 

type NextAction struct {
	// Description holds the user-readable description of the next action.
	// This should be short and start with a capital letter.
	Description string
	// Commands are a list of commands to show the user. These commands should be
	// equivalent e.g. a URL, a kubectl and a kf command that all achieve the
	// same action could be put together.
	Commands []string
}

NextAction is a user-facing suggested next action that can be taken after running a particular command.

type ResourceFlags 

type ResourceFlags struct {
	// contains filtered or unexported fields
}

ResourceFlags is a flag set for intaking container resource requests (e.g. cpu/memory/disk).

func (*ResourceFlags) Add 

func (flags *ResourceFlags) Add(cmd *cobra.Command)

Add adds the resource flags to the Cobra command.

func (*ResourceFlags) CPU 

func (flags *ResourceFlags) CPU() string

CPU returns the cpu flag value.

func (*ResourceFlags) Disk 

func (flags *ResourceFlags) Disk() string

Disk returns the disk flag value.

func (*ResourceFlags) Memory 

func (flags *ResourceFlags) Memory() string

Memory returns the memory flag value.

type RetryFlags 

type RetryFlags struct {
	// contains filtered or unexported fields
}

RetryFlags is a flag set for managing how a command retries attempts.

Example 
var retry RetryFlags

cmd := &cobra.Command{
	Run: func(cmd *cobra.Command, args []string) {
		times := 0
		retry.Retry(func() error {
			fmt.Println("Running:", times)
			times++
			return errors.New("trigger-retry")
		})
	},
}
retry.Add(cmd, 3, 10*time.Millisecond)

cmd.SetArgs([]string{})
cmd.ExecuteC()

Output:

Running: 0
Running: 1
Running: 2

func (*RetryFlags) Add 

func (flags *RetryFlags) Add(cmd *cobra.Command, retries int, delay time.Duration)

Add adds the retry flags to the Cobra command.

func (*RetryFlags) AddRetryForK8sPropagation 

func (flags *RetryFlags) AddRetryForK8sPropagation(cmd *cobra.Command)

AddRetryForK8sPropagation sets up a retrier suitable for handling K8s propagation delays. It's guaranteed to retry more than once with a delay of >= 1 second, but specific backoff algorithm, times, delays, or jitter are subject to change.

func (*RetryFlags) Retry 

func (flags *RetryFlags) Retry(callback func() error) error

Retry repeats the command the specified number of times with a delay.

Source Files

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