peer: don't inv trickle new blocks

peer/peer.go

@@ -1723,8 +1723,20 @@ out:
 		case iv := <-p.outputInvChan:
 			// No handshake?  They'll find out soon enough.
 			if p.VersionKnown() {
+				// If this is a new block, then we'll blast it
+				// out immediately, sipping the inv trickle
+				// queue.
+				if iv.Type == wire.InvTypeBlock ||
+					iv.Type == wire.InvTypeWitnessBlock {
+
+					invMsg := wire.NewMsgInvSizeHint(1)
+					invMsg.AddInvVect(iv)
+					waiting = queuePacket(outMsg{msg: invMsg},
+						pendingMsgs, waiting)
+				} else {
 					invSendQueue.PushBack(iv)
 				}
+			}
 
 		case <-trickleTicker.C:
 			// Don't send anything if we're disconnecting or there