import (
	"fmt"
	"github.com/getsentry/raven-go"
	pkgErrors "github.com/pkg/errors"
)

type causer interface {
	Cause() error
}

type customErr struct {
	msg   string
	cause error
}

func (e *customErr) Error() (errorMsg string) {
	if e.msg != "" && e.cause != nil {
		errorMsg = fmt.Sprintf("%v \n\t==>> %v", e.msg, e.cause)
	} else if e.msg == "" && e.cause != nil {
		errorMsg = fmt.Sprintf("%v", e.cause)
	} else if e.msg != "" && e.cause == nil {
		errorMsg = fmt.Sprintf("%s", e.msg)
	}
	return
}

// Implementing the causer interface from github.com/pkg/errors
func (e *customErr) Cause() error {
	return e.cause
}

func main() {
	_err := &customErr{
		cause: nil,
		msg:   "This is a test",
	}
	err := pkgErrors.WithStack(_err)
	raven.CaptureErrorAndWait(err, nil)
}

panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x18 pc=0x12eeec6]

goroutine 1 [running]:
github.com/getsentry/raven-go.NewException(0x0, 0x0, 0xc000323200, 0x3)
	/Users/adityasatyavada/go/src/github.com/getsentry/raven-go/exception.go:11 +0x26
github.com/getsentry/raven-go.(*Client).CaptureErrorAndWait(0xc000328000, 0x1440900, 0xc000323100, 0x0, 0x0, 0x0, 0x0, 0xc000323100, 0xc0003230e0)
	/Users/adityasatyavada/go/src/github.com/getsentry/raven-go/client.go:740 +0x2fd
github.com/getsentry/raven-go.CaptureErrorAndWait(0x1440900, 0xc000323100, 0x0, 0x0, 0x0, 0x0, 0xc000147f88, 0xc000074058)
	/Users/adityasatyavada/go/src/github.com/getsentry/raven-go/client.go:751 +0x70
main.main()

cause := pkgErrors.Cause(err)
if cause == nil{
	cause = err
}