Function FindWrappedError

errors/errors.go:278–298

Performs a deep check of wrapped errors to find one which is selected by the given classifier func. The classifer is called on all non-nil errors found, starting with topErr, then on each inner wrapped error in turn until it returns non-nil which ends the scan. If the classifier ever returns a non-

(
	topErr error,
	classifier func(curErr, topErr error) error,
)

// with `true` to indicate something was found.  Otherwise this function will return
// `topErr, false`.
func FindWrappedError(
	topErr error,
	classifier func(curErr, topErr error) error,
) (error, bool) {
	for curErr := topErr; curErr != nil; {
		classifiedErr := classifier(curErr, topErr)
		if classifiedErr != nil {
			return classifiedErr, true
		}

		dbxErr, ok := curErr.(DropboxError)
		if !ok || dbxErr == nil {
			break
		}
		curErr = dbxErr.Unwrap()
		if curErr == nil {
			break
		}
	}
	return topErr, false
}