Handling errors in go

main.go

package main

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

// This example is similar to "github.com/pkg/errors" from Dave Cheney
// The idea is to declare simple error and have them chained using WrapErr
// so it's easy to have the complete chain of errors if needed.
// Also declaring error variables is useful when comparing errors.

var (
  ErrBadNumber = errors.Errorf("The number must be between 1 and %d", (1<<16) - 1)
  ErrParseEnvVar = errors.New("Error parsing env variable")
)

func envToUint16(env string) (uint16, error) {
  // parse the env var to integer
  return 0, errors.WrapErr(ErrBadNumber, ErrParseEnvVar)
}

func main() {
  env := "blih"

  _, err := envToUint16(env)
  fmt.Println(errors.Wrapf(err, "Error parsing number from env: %s", env))
}