add pkgs from core

registry/chain.go

@@ -0,0 +1,40 @@
+package registry
+
+import (
+	"github.com/go-gost/core/chain"
+)
+
+type chainRegistry struct {
+	registry
+}
+
+func (r *chainRegistry) Register(name string, v chain.Chainer) error {
+	return r.registry.Register(name, v)
+}
+
+func (r *chainRegistry) Get(name string) chain.Chainer {
+	if name != "" {
+		return &chainWrapper{name: name, r: r}
+	}
+	return nil
+}
+
+func (r *chainRegistry) get(name string) chain.Chainer {
+	if v := r.registry.Get(name); v != nil {
+		return v.(chain.Chainer)
+	}
+	return nil
+}
+
+type chainWrapper struct {
+	name string
+	r    *chainRegistry
+}
+
+func (w *chainWrapper) Route(network, address string) *chain.Route {
+	v := w.r.get(w.name)
+	if v == nil {
+		return nil
+	}
+	return v.Route(network, address)
+}