add some helper structs

bypass/bypass.go

@@ -5,3 +5,22 @@ type Bypass interface {
 	// Contains reports whether the bypass includes addr.
 	Contains(addr string) bool
 }
+
+type bypassList struct {
+	bypasses []Bypass
+}
+
+func BypassList(bypasses ...Bypass) Bypass {
+	return &bypassList{
+		bypasses: bypasses,
+	}
+}
+
+func (p *bypassList) Contains(addr string) bool {
+	for _, bypass := range p.bypasses {
+		if bypass != nil && bypass.Contains(addr) {
+			return true
+		}
+	}
+	return false
+}