internal

Documentation

Index

• func RetryBackoff(retry int, minBackoff, maxBackoff time.Duration) time.Duration
• func Sleep(ctx context.Context, dur time.Duration) error
• func ToLower(s string) string
• func Unwrap(err error) error
• type Logging
• type Once
  • func (o *Once) Do(f func() error) error

Functions

func RetryBackoff

func RetryBackoff(retry int, minBackoff, maxBackoff time.Duration) time.Duration

Retry backoff with jitter sleep to prevent overloaded conditions during intervals https://www.awsarchitectureblog.com/2015/03/backoff.html

func Sleep

func Sleep(ctx context.Context, dur time.Duration) error

func ToLower

func ToLower(s string) string

func Unwrap

func Unwrap(err error) error

Types

type Logging

type Logging interface {
	Printf(format string, v ...interface{})
}

var Logger Logging = log.New(os.Stderr, "redis: ", log.LstdFlags|log.Lshortfile)

type Once

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

A Once will perform a successful action exactly once.

Unlike a sync.Once, this Once's func returns an error and is re-armed on failure.

func (*Once) Do

func (o *Once) Do(f func() error) error

Do calls the function f if and only if Do has not been invoked without error for this instance of Once. In other words, given

var once Once

if once.Do(f) is called multiple times, only the first call will invoke f, even if f has a different value in each invocation unless f returns an error. A new instance of Once is required for each function to execute.

Do is intended for initialization that must be run exactly once. Since f is niladic, it may be necessary to use a function literal to capture the arguments to a function to be invoked by Do:

err := config.once.Do(func() error { return config.init(filename) })