add pkgs from core

registry/hosts.go

@@ -0,0 +1,42 @@
+package registry
+
+import (
+	"net"
+
+	"github.com/go-gost/core/hosts"
+)
+
+type hostsRegistry struct {
+	registry
+}
+
+func (r *hostsRegistry) Register(name string, v hosts.HostMapper) error {
+	return r.registry.Register(name, v)
+}
+
+func (r *hostsRegistry) Get(name string) hosts.HostMapper {
+	if name != "" {
+		return &hostsWrapper{name: name, r: r}
+	}
+	return nil
+}
+
+func (r *hostsRegistry) get(name string) hosts.HostMapper {
+	if v := r.registry.Get(name); v != nil {
+		return v.(hosts.HostMapper)
+	}
+	return nil
+}
+
+type hostsWrapper struct {
+	name string
+	r    *hostsRegistry
+}
+
+func (w *hostsWrapper) Lookup(network, host string) ([]net.IP, bool) {
+	v := w.r.get(w.name)
+	if v == nil {
+		return nil, false
+	}
+	return v.Lookup(network, host)
+}