network/retrieve: add bzz-retrieve protocol (#1589)

* network/retrieve: initial commit

* network: import dependencies from stream package branch

* network/retrieve: address pr comments

* network/retrieve: fix pr comments

* network/retrieve: create logger for peer

* network: address pr comments

* network/retrieve: lint

* network/retrieve: prevent forever loop

* network/retrieve: address pr comments

* network/retrieve: fix linter

* network/retrieve: pr comments

* network/retrieval: pr comments

Author: acud

network/retrieval/peer.go

@@ -0,0 +1,36 @@
+// Copyright 2019 The Swarm Authors
+// This file is part of the Swarm library.
+//
+// The Swarm 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 Swarm 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 Swarm library. If not, see <http://www.gnu.org/licenses/>.
+
+package retrieval
+
+import (
+	"github.com/ethereum/go-ethereum/log"
+	"github.com/ethersphere/swarm/network"
+)
+
+// Peer wraps BzzPeer with a contextual logger for this peer
+type Peer struct {
+	*network.BzzPeer
+	logger log.Logger
+}
+
+// NewPeer is the constructor for Peer
+func NewPeer(peer *network.BzzPeer) *Peer {
+	return &Peer{
+		BzzPeer: peer,
+		logger:  log.New("peer", peer.ID()),
+	}
+}