From 7c3f79cb9fcd51ade2b25c700567bdc101250ce1 Mon Sep 17 00:00:00 2001
From: moneromooo-monero <moneromooo-monero@users.noreply.github.com>
Date: Sat, 21 Jan 2017 20:30:10 +0000
Subject: [PATCH] core: early out in handle_incoming_tx if already in pool or
 blockchain

---
 src/cryptonote_core/cryptonote_core.cpp | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/src/cryptonote_core/cryptonote_core.cpp b/src/cryptonote_core/cryptonote_core.cpp
index 5294431d..5be25a41 100644
--- a/src/cryptonote_core/cryptonote_core.cpp
+++ b/src/cryptonote_core/cryptonote_core.cpp
@@ -496,6 +496,18 @@ namespace cryptonote
       return false;
     }
 
+    if(m_mempool.have_tx(tx_hash))
+    {
+      LOG_PRINT_L2("tx " << tx_hash << "already have transaction in tx_pool");
+      return true;
+    }
+
+    if(m_blockchain_storage.have_tx(tx_hash))
+    {
+      LOG_PRINT_L2("tx " << tx_hash << " already have transaction in blockchain");
+      return true;
+    }
+
     if(!check_tx_syntax(tx))
     {
       LOG_PRINT_L1("WRONG TRANSACTION BLOB, Failed to check tx " << tx_hash << " syntax, rejected");