Simple Go library for typed const errors creation

Overview

go-errors

Why this repo was created?

Main reason was to create additional methods for better error typing support.

Features

  • Errors as constants
  • errors.Is support
  • Wrap method to wrap original error with errors.Unwrap method
  • String.New support to add context arguments for error message, while errors.Is still compares error itself
  • Error.WithStack support to store stack trace at time method called

Show me the code

https://play.golang.org/p/U2lC-yC2YIb

package main

import (
	"errors"
	"log"

	serr "github.com/bdandy/go-errors"
)

const ErrSomeFunc = serr.String("somefunc for %s failed")

func someFunc() error {
	return errors.New("io error")
}

func funcWithArgs(args ...interface{}) error {
	err := someFunc()
	if err != nil {
		return ErrSomeFunc.New(args...).Wrap(err)
	}
	return nil
}

func main() {
	err := funcWithArgs("tryme!")

	// handle ErrSomeFunc error type
	if errors.Is(err, ErrSomeFunc) {
		log.Print("typedError handled: ", err)
	} else if err != nil {
		log.Print("other error cases:", err)
	}
}

Benchmark

Comparsion with errors.Errorf and pkg/errors

goos: linux
goarch: amd64
pkg: github.com/bdandy/go-errors
cpu: Intel(R) Core(TM) i7-1065G7 CPU @ 1.30GHz
BenchmarkWrap-8                  	 5007164               270.9 ns/op           136 B/op          6 allocs/op
BenchmarkWrapWithStack-8         	 1232276               947.3 ns/op           392 B/op          7 allocs/op
BenchmarkErrorfWrap-8                    4218820               284.9 ns/op           64 B/op           3 allocs/op
BenchmarkPkgErrorWrap-8                  1376254               858.2 ns/op           368 B/op          6 allocs/op
BenchmarkPkgErrorWrapWithStack-8          781378               1593 ns/op            672 B/op          9 allocs/op
PASS
Owner
Bogdan
Bogdan
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