Annotation with stack trace for go1.13

Go 1.13 contains support for error wrapping. Now you can add additional information to an error by wrapping it using the new %w verb at fmt.Errorf and examine such errors using errors.Is and errors.As. If you also want to save a stack trace of an error instead of fmt.Errorf use stack.Errorf which is compatible with errors.Is and errors.As and also gives the ability to get a stack trace of the error using stack.Trace function which will return []runtime.Frame.

Import.

import "github.com/romanyx/stack

Annotate error.

func example() error {
	if err := call(); err != nil {
		return stack.Errorf("call: %w", err)
	}

	return nil
}

Print original error.

stack.Origin(err)

Iterate through stack trace.

for _, frame := range stack.Trace(err) {
	fmt.Printf("%s:%d %s()\n", frame.File, frame.Line, frame.Function)
}