Do not announce blocks (or txs) to peers when chain is stale.

Author: evoskuil

src/protocols/protocol_block_out.cpp

@@ -437,10 +437,14 @@ bool protocol_block_out::handle_reorganized(code ec, size_t fork_height,
         return false;
     }
 
-    // Nothing to do here.
+    // Nothing to do, a channel is stopping but it's not this one.
     if (!incoming)
         return true;
 
+    // Do not announce blocks to peer if too far behind.
+    if (chain_.is_stale())
+        return true;
+
     // TODO: consider always sending the last block as compact if enabled.
     if (false && compact_to_peer_ && incoming->size() == 1)
     {

src/protocols/protocol_transaction_out.cpp

@@ -245,6 +245,11 @@ bool protocol_transaction_out::handle_notification(const code& ec,
     if (!message)
         return true;
 
+    // Do not announce transactions to peer if too far behind.
+    // Typically the tx would not validate anyway, but this is more consistent.
+    if (chain_.is_stale())
+        return true;
+
     if (message->validation.originator == nonce())
         return true;