Adding some custom errors

Changes

1 changed files (+42/-0)

• errors.go (new)
  • @@ -0,0 +1,42 @@
    + package activitypub + + import ( + "fmt" + as "github.com/go-ap/activitystreams" + ) + + type causer interface { + // Cause returns the parent error + Cause() error + } + + // Error is an local error type + // It should contain the ActivityPub object that generated the error + type Error struct { + on as.Item + msg string + parent error + } + + // Error implements the errors interface + func (e Error) Error() string { + return fmt.Sprintf("%s %s", e.msg, *e.on.GetID()) + } + + // Cause returns the parent error + func (e Error) Cause() error { + return e.parent + } + + func (e Error) Is(err error) bool { + for { + if err == e { + return true + } + if e, ok := err.(causer); ok { + err = e.Cause() + } else { + return false + } + } + }