xcontext

Documentation

Overview

Package xcontext is a package to offer the extra functionality we need from contexts that is not available from the standard context package.

Index

• func Detach(ctx context.Context) context.Context

Examples

• Detach

Functions

func Detach

func Detach(ctx context.Context) context.Context

Detach returns a context that keeps all the values of its parent context but detaches from the cancellation and error handling.

Example

package main

import (
	"context"

	"github.com/komuw/ong/xcontext"
)

type ctxKey string

func log(ctx context.Context, logMsg string)   {}
func sendMail(ctx context.Context, msg string) {}

func main() {
	key := ctxKey("key")
	ctx := context.WithValue(context.Background(), key, "my_value")

	// Detach is not required here.
	log(ctx, "api called.")

	// We need to use Detach here, because sendMail(having been called in a goroutine) can outlive the cancellation of the parent context.
	go sendMail(xcontext.Detach(ctx), "hello")

}