Golang Tips & Tricks #1 - errors

You should use the package github.com/pkg/errors instead of errors package for errors in your applications. The default package lacks a few things like:

It helps with debugging a lot. Below you can find an example error message with the stack trace.

An important thing to remember is that you should wrap every error which is from any external library or your freshly created error you want to return.

l, err := net.Listen("tcp4", fmt.Sprintf("%s:%d", host, port))
if err != nil {
    return errors.Wrapf(err, "cannot start listening on port %d", port)
}

or…

return errors.Wrap(MyError{}, "could not handle the situation")

If you want to add an extra message to already wrapped error, use WithMessage() function.

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Tags: #golang

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