errs

Documentation

Overview

Here are some error handling snippets.

Example (PkgErrors)

package main

import (
	"fmt"
	"github.com/pkg/errors"
)

func raiseAnError() error {
	return errors.Wrap(errors.New("All is not well"), "error raiser")
}

func main() {
	fmt.Println(raiseAnError())
}

Output:

error raiser: All is not well

Example (PkgErrorsDeeper)

package main

import (
	"fmt"
	"github.com/pkg/errors"
)

func raiseAnError() error {
	return errors.Wrap(errors.New("All is not well"), "error raiser")
}

func anotherLayer() error {
	return errors.Wrap(raiseAnError(), "anotherLayer()")
}

func main() {
	fmt.Println(anotherLayer())
}

Output:

anotherLayer(): error raiser: All is not well

Example (PkgErrorsDeeperWithCause)

package main

import (
	"fmt"
	"github.com/pkg/errors"
)

func raiseAnError() error {
	return errors.Wrap(errors.New("All is not well"), "error raiser")
}

func anotherLayer() error {
	return errors.Wrap(raiseAnError(), "anotherLayer()")
}

func main() {
	fmt.Println(errors.Cause(anotherLayer()))
}

Output:

All is not well

Example (PkgErrorsDepthWithoutError)

package main

import (
	"fmt"
	"github.com/pkg/errors"
)

func withoutAnError() error {
	return nil
}

func anotherLayerWithoutAnError() error {
	return errors.Wrap(withoutAnError(), "anotherLayerWithoutAnError")
}

func main() {
	fmt.Println(anotherLayerWithoutAnError())
}

Output:

<nil>