* add errors.As
convert target err to *Error, return false if err don't match *Error
* update errors.As to (*Error, bool)
* fixing FromError panic issue when err is nil
* pass micro errors from grpc server to grpc client
Signed-off-by: Vasiliy Tolstov <v.tolstov@unistack.org>
* wrap micro errors.Error to grpc status
Signed-off-by: Vasiliy Tolstov <v.tolstov@unistack.org>
By making the error helper functions variadic functions, you can pass either a string (like the existing behaviour) or a format and verbs that will then be formatted for you.
This doesn’t break any existing API’s, but it prevents people using this package to have to call `fmt.Sprintf` whenever they would like to format the error detail.
