swarm: network rewrite merge

swarm/network/common.go

@@ -0,0 +1,30 @@
+// Copyright 2018 The go-ethereum Authors
+// This file is part of the go-ethereum library.
+//
+// The go-ethereum library is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// The go-ethereum library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
+
+package network
+
+import (
+	"fmt"
+	"strings"
+)
+
+func LogAddrs(nns [][]byte) string {
+	var nnsa []string
+	for _, nn := range nns {
+		nnsa = append(nnsa, fmt.Sprintf("%08x", nn[:4]))
+	}
+	return strings.Join(nnsa, ", ")
+}