From d2d5dbc6fbdb613a0c5b1967ee82a74cd94739a3 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?P=C3=A9ter=20Szil=C3=A1gyi?= <peterke@gmail.com>
Date: Wed, 13 May 2015 13:13:43 +0300
Subject: eth/downloader: fix active peer shadowing, polish func names

---
 eth/downloader/downloader.go      | 28 ++++++++++------------------
 eth/downloader/downloader_test.go |  8 ++++----
 eth/handler.go                    |  4 ++--
 3 files changed, 16 insertions(+), 24 deletions(-)

diff --git a/eth/downloader/downloader.go b/eth/downloader/downloader.go
index 577152a21..c6eecfe2f 100644
--- a/eth/downloader/downloader.go
+++ b/eth/downloader/downloader.go
@@ -55,10 +55,9 @@ type hashPack struct {
 }
 
 type Downloader struct {
-	mu         sync.RWMutex
-	queue      *queue
-	peers      *peerSet
-	activePeer string
+	mu    sync.RWMutex
+	queue *queue
+	peers *peerSet
 
 	// Callbacks
 	hasBlock hashCheckFn
@@ -162,7 +161,6 @@ func (d *Downloader) Has(hash common.Hash) bool {
 // syncWithPeer starts a block synchronization based on the hash chain from the
 // specified peer and head hash.
 func (d *Downloader) syncWithPeer(p *peer, hash common.Hash) (err error) {
-	d.activePeer = p.id
 	defer func() {
 		// reset on error
 		if err != nil {
@@ -416,32 +414,26 @@ out:
 	return nil
 }
 
-// Deliver a chunk to the downloader. This is usually done through the BlocksMsg by
-// the protocol handler.
-func (d *Downloader) DeliverChunk(id string, blocks []*types.Block) error {
+// DeliverBlocks injects a new batch of blocks received from a remote node.
+// This is usually invoked through the BlocksMsg by the protocol handler.
+func (d *Downloader) DeliverBlocks(id string, blocks []*types.Block) error {
 	// Make sure the downloader is active
 	if atomic.LoadInt32(&d.synchronising) == 0 {
 		return errNoSyncActive
 	}
-
 	d.blockCh <- blockPack{id, blocks}
 
 	return nil
 }
 
-func (d *Downloader) AddHashes(id string, hashes []common.Hash) error {
+// DeliverHashes injects a new batch of hashes received from a remote node into
+// the download schedule. This is usually invoked through the BlockHashesMsg by
+// the protocol handler.
+func (d *Downloader) DeliverHashes(id string, hashes []common.Hash) error {
 	// Make sure the downloader is active
 	if atomic.LoadInt32(&d.synchronising) == 0 {
 		return errNoSyncActive
 	}
-
-	// make sure that the hashes that are being added are actually from the peer
-	// that's the current active peer. hashes that have been received from other
-	// peers are dropped and ignored.
-	if d.activePeer != id {
-		return fmt.Errorf("received hashes from %s while active peer is %s", id, d.activePeer)
-	}
-
 	if glog.V(logger.Debug) && len(hashes) != 0 {
 		from, to := hashes[0], hashes[len(hashes)-1]
 		glog.V(logger.Debug).Infof("adding %d (T=%d) hashes [ %x / %x ] from: %s\n", len(hashes), d.queue.Pending(), from[:4], to[:4], id)
diff --git a/eth/downloader/downloader_test.go b/eth/downloader/downloader_test.go
index 385ad2909..78eff011a 100644
--- a/eth/downloader/downloader_test.go
+++ b/eth/downloader/downloader_test.go
@@ -76,7 +76,7 @@ func (dl *downloadTester) getBlock(hash common.Hash) *types.Block {
 }
 
 func (dl *downloadTester) getHashes(hash common.Hash) error {
-	dl.downloader.AddHashes(dl.activePeerId, dl.hashes)
+	dl.downloader.DeliverHashes(dl.activePeerId, dl.hashes)
 	return nil
 }
 
@@ -87,7 +87,7 @@ func (dl *downloadTester) getBlocks(id string) func([]common.Hash) error {
 			blocks[i] = dl.blocks[hash]
 		}
 
-		go dl.downloader.DeliverChunk(id, blocks)
+		go dl.downloader.DeliverBlocks(id, blocks)
 
 		return nil
 	}
@@ -188,12 +188,12 @@ func TestInactiveDownloader(t *testing.T) {
 	blocks := createBlocksFromHashSet(createHashSet(hashes))
 	tester := newTester(t, hashes, nil)
 
-	err := tester.downloader.AddHashes("bad peer 001", hashes)
+	err := tester.downloader.DeliverHashes("bad peer 001", hashes)
 	if err != errNoSyncActive {
 		t.Error("expected no sync error, got", err)
 	}
 
-	err = tester.downloader.DeliverChunk("bad peer 001", blocks)
+	err = tester.downloader.DeliverBlocks("bad peer 001", blocks)
 	if err != errNoSyncActive {
 		t.Error("expected no sync error, got", err)
 	}
diff --git a/eth/handler.go b/eth/handler.go
index 88394543e..b2d741295 100644
--- a/eth/handler.go
+++ b/eth/handler.go
@@ -224,7 +224,7 @@ func (self *ProtocolManager) handleMsg(p *peer) error {
 		if err := msgStream.Decode(&hashes); err != nil {
 			break
 		}
-		err := self.downloader.AddHashes(p.id, hashes)
+		err := self.downloader.DeliverHashes(p.id, hashes)
 		if err != nil {
 			glog.V(logger.Debug).Infoln(err)
 		}
@@ -264,7 +264,7 @@ func (self *ProtocolManager) handleMsg(p *peer) error {
 			glog.V(logger.Detail).Infoln("Decode error", err)
 			blocks = nil
 		}
-		self.downloader.DeliverChunk(p.id, blocks)
+		self.downloader.DeliverBlocks(p.id, blocks)
 
 	case NewBlockMsg:
 		var request newBlockMsgData
-- 
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