Send have message without too much delay

Also send bitfield rather than have messages if bitfield message is
equal to or less than the sum of have messages which otherwise would
be sent.

src/DefaultBtInteractive.cc

@@ -105,8 +105,7 @@ DefaultBtInteractive::DefaultBtInteractive(
       numReceivedMessage_(0),
       maxOutstandingRequest_(DEFAULT_MAX_OUTSTANDING_REQUEST),
       requestGroupMan_(nullptr),
-      tcpPort_(0),
-      haveLastSent_(global::wallclock())
+      tcpPort_(0)
 {
 }
 
@@ -264,37 +263,29 @@ void DefaultBtInteractive::decideChoking()
   }
 }
 
-namespace {
-constexpr auto MAX_HAVE_DELAY_SEC = 10_s;
-} // namespace
-
 void DefaultBtInteractive::checkHave()
 {
-  const size_t MIN_HAVE_PACK_SIZE = 20;
-  pieceStorage_->getAdvertisedPieceIndexes(haveIndexes_, cuid_, haveTimer_);
+  std::vector<size_t> haveIndexes;
+
+  pieceStorage_->getAdvertisedPieceIndexes(haveIndexes, cuid_, haveTimer_);
   haveTimer_ = global::wallclock();
-  if (haveIndexes_.size() >= MIN_HAVE_PACK_SIZE) {
+  // Use bitfield message if it is equal to or less than the total
+  // size of have messages.
+  if (5 + pieceStorage_->getBitfieldLength() <= haveIndexes.size() * 9) {
     if (peer_->isFastExtensionEnabled() &&
         pieceStorage_->allDownloadFinished()) {
       dispatcher_->addMessageToQueue(messageFactory_->createHaveAllMessage());
+
+      return;
     }
-    else {
-      dispatcher_->addMessageToQueue(messageFactory_->createBitfieldMessage());
-    }
-    haveIndexes_.clear();
+
+    dispatcher_->addMessageToQueue(messageFactory_->createBitfieldMessage());
+
+    return;
   }
-  else {
-    if (haveIndexes_.size() >= MIN_HAVE_PACK_SIZE ||
-        haveLastSent_.difference(global::wallclock()) >= MAX_HAVE_DELAY_SEC) {
-      haveLastSent_ = global::wallclock();
-      for (std::vector<size_t>::const_iterator itr = haveIndexes_.begin(),
-                                               eoi = haveIndexes_.end();
-           itr != eoi; ++itr) {
-        dispatcher_->addMessageToQueue(
-            messageFactory_->createHaveMessage(*itr));
-      }
-      haveIndexes_.clear();
-    }
+
+  for (auto idx : haveIndexes) {
+    dispatcher_->addMessageToQueue(messageFactory_->createHaveMessage(idx));
   }
 }
 

src/DefaultBtInteractive.h

@@ -144,9 +144,6 @@ private:
 
   uint16_t tcpPort_;
 
-  std::vector<size_t> haveIndexes_;
-  Timer haveLastSent_;
-
   void addBitfieldMessageToQueue();
   void addAllowedFastMessageToQueue();
   void addHandshakeExtendedMessageToQueue();