util

Documentation

Overview

Package util provides utility functions for the cmd packages.

Index

• Variables
• func AllLocalIP4() ([]net.IP, error)
• func CertPoolFromFile(filename string) (*x509.CertPool, error)
• func CertificatesFromFile(file string) ([]*x509.Certificate, error)
• func CertificatesFromPEM(pemCerts []byte) ([]*x509.Certificate, error)
• func DefaultLocalIP4() (net.IP, error)
• func Env(key string, defaultValue string) string
• func EnvInt(key string, defaultValue int32, minValue int32) int32
• func GetEnv(key string) (string, bool)
• func GetLogLevel() (level int)
• func IsEnvironmentArgument(s string) bool
• func IsTerminal(r io.Reader) bool
• func MakeAbs(path, base string) (string, error)
• func MakeRelative(path, base string) (string, error)
• func PromptForBool(r io.Reader, format string, a ...interface{}) bool
• func PromptForPasswordString(r io.Reader, format string, a ...interface{}) string
• func PromptForString(r io.Reader, format string, a ...interface{}) string
• func PromptForStringWithDefault(r io.Reader, def string, format string, a ...interface{}) string
• func RelativizePathWithNoBacksteps(refs []*string, base string) error
• func RelativizePaths(refs []*string, base string) error
• func ResolvePaths(refs []*string, base string) error
• func TransportFor(ca string, certFile string, keyFile string) (http.RoundTripper, error)
• func TryListen(hostPort string) (bool, error)
• func WaitForSuccessfulDial(https bool, network, address string, timeout, interval time.Duration, ...) error
• type Environment
  • func ParseEnvironmentArguments(s []string) (Environment, []string, []error)
• type Mux
• type Output
  • func (o Output) Get() io.Writer

Variables

var ErrorNoDefaultIP = errors.New("no suitable IP address")

NoDefaultIP means no suitable non-loopback address can be found.

Functions

func AllLocalIP4

func AllLocalIP4() ([]net.IP, error)

AllLocalIP4 returns all the IPv4 addresses that this host can be reached on.

func CertPoolFromFile

func CertPoolFromFile(filename string) (*x509.CertPool, error)

func CertificatesFromFile

func CertificatesFromFile(file string) ([]*x509.Certificate, error)

func CertificatesFromPEM

func CertificatesFromPEM(pemCerts []byte) ([]*x509.Certificate, error)

func DefaultLocalIP4

func DefaultLocalIP4() (net.IP, error)

DefaultLocalIP4 returns an IPv4 address that this host can be reached on. Will return NoDefaultIP if no suitable address can be found.

func Env

func Env(key string, defaultValue string) string

Env returns an environment variable or a default value if not specified.

func EnvInt

func EnvInt(key string, defaultValue int32, minValue int32) int32

func GetEnv

func GetEnv(key string) (string, bool)

GetEnv returns an environment value if specified

func GetLogLevel

func GetLogLevel() (level int)

GetLogLevel returns the current glog log level

func IsEnvironmentArgument

func IsEnvironmentArgument(s string) bool

func IsTerminal

func IsTerminal(r io.Reader) bool

func MakeAbs

func MakeAbs(path, base string) (string, error)

func MakeRelative

func MakeRelative(path, base string) (string, error)

func PromptForBool

func PromptForBool(r io.Reader, format string, a ...interface{}) bool

Prompt for user input of a boolean value. The accepted values are:

yes, y, true, 	t, 1 (not case sensitive)
no, 	n, false, f, 0 (not case sensitive)

A valid answer is mandatory so it will keep asking until an answer is provided.

func PromptForPasswordString

func PromptForPasswordString(r io.Reader, format string, a ...interface{}) string

Prompt for user input by disabling echo in terminal, useful for password prompt.

func PromptForString

func PromptForString(r io.Reader, format string, a ...interface{}) string

Takes an io.Reader and prompt for user input if it's a terminal, returning the result.

func PromptForStringWithDefault

func PromptForStringWithDefault(r io.Reader, def string, format string, a ...interface{}) string

Prompt for user input but take a default in case nothing is provided.

func RelativizePathWithNoBacksteps

func RelativizePathWithNoBacksteps(refs []*string, base string) error

RelativizePathWithNoBacksteps updates the given refs to be relative paths, relative to the given base directory as long as they do not require backsteps. Any path requiring a backstep is left as-is as long it is absolute. Any non-absolute path that can't be relativized produces an error

func RelativizePaths

func RelativizePaths(refs []*string, base string) error

RelativizePaths updates the given refs to be relative paths, relative to the given base directory

func ResolvePaths

func ResolvePaths(refs []*string, base string) error

ResolvePaths updates the given refs to be absolute paths, relative to the given base directory

func TransportFor

func TransportFor(ca string, certFile string, keyFile string) (http.RoundTripper, error)

TransportFor returns an http.Transport for the given ca and client cert (which may be empty strings)

func TryListen

func TryListen(hostPort string) (bool, error)

TryListen tries to open a connection on the given port and returns true if it succeeded.

func WaitForSuccessfulDial

func WaitForSuccessfulDial(https bool, network, address string, timeout, interval time.Duration, retries int) error

WaitForDial attempts to connect to the given address, closing and returning nil on the first successful connection.

Types

type Environment

type Environment map[string]string

func ParseEnvironmentArguments

func ParseEnvironmentArguments(s []string) (Environment, []string, []error)

type Mux

type Mux interface {
	Handle(pattern string, handler http.Handler)
	HandleFunc(pattern string, handler func(http.ResponseWriter, *http.Request))
}

Mux is a standard mux interface for HTTP

type Output

type Output struct {
	Out io.Writer
}

func (Output) Get

func (o Output) Get() io.Writer