Remove mapRelay

Author: MarcoFalke

src/net_processing.cpp

@@ -51,9 +51,7 @@
 #include <optional>
 #include <typeinfo>
 
-/** How long to cache transactions in mapRelay for normal relay */
-static constexpr auto RELAY_TX_CACHE_TIME = 15min;
-/** How long a transaction has to be in the mempool before it can unconditionally be relayed (even when not in mapRelay). */
+/** How long a transaction has to be in the mempool before it can unconditionally be relayed. */
 static constexpr auto UNCONDITIONAL_RELAY_DELAY = 2min;
 /** Headers download timeout.
  *  Timeout = base + per_header * (expected number of headers) */
@@ -920,12 +918,6 @@ class PeerManagerImpl final : public PeerManager
     /** Process a new block. Perform any post-processing housekeeping */
     void ProcessBlock(CNode& node, const std::shared_ptr<const CBlock>& block, bool force_processing, bool min_pow_checked);
 
-    /** Relay map (txid or wtxid -> CTransactionRef) */
-    typedef std::map<uint256, CTransactionRef> MapRelay;
-    MapRelay mapRelay GUARDED_BY(NetEventsInterface::g_msgproc_mutex);
-    /** Expiration-time ordered list of (expire time, relay map entry) pairs. */
-    std::deque<std::pair<std::chrono::microseconds, MapRelay::iterator>> g_relay_expiration GUARDED_BY(NetEventsInterface::g_msgproc_mutex);
-
     /**
      * When a peer sends us a valid block, instruct it to announce blocks to us
      * using CMPCTBLOCK if possible by adding its nodeid to the end of
@@ -2322,12 +2314,6 @@ CTransactionRef PeerManagerImpl::FindTxForGetData(const Peer::TxRelay& tx_relay,
         }
     }
 
-    // Or it might be recent and in the relay pool.
-    if (recent) {
-        auto mi = mapRelay.find(gtxid.GetHash());
-        if (mi != mapRelay.end()) return mi->second;
-    }
-
     return {};
 }
 
@@ -5796,7 +5782,6 @@ bool PeerManagerImpl::SendMessages(CNode* pto)
                             continue;
                         }
                         auto txid = txinfo.tx->GetHash();
-                        auto wtxid = txinfo.tx->GetWitnessHash();
                         // Peer told you to not send transactions at that feerate? Don't bother sending it.
                         if (txinfo.fee < filterrate.GetFee(txinfo.vsize)) {
                             continue;
@@ -5806,24 +5791,6 @@ bool PeerManagerImpl::SendMessages(CNode* pto)
                         tx_relay->m_recently_announced_invs.insert(hash);
                         vInv.push_back(inv);
                         nRelayedTransactions++;
-                        {
-                            // Expire old relay messages
-                            while (!g_relay_expiration.empty() && g_relay_expiration.front().first < current_time)
-                            {
-                                mapRelay.erase(g_relay_expiration.front().second);
-                                g_relay_expiration.pop_front();
-                            }
-
-                            auto ret = mapRelay.emplace(txid, std::move(txinfo.tx));
-                            if (ret.second) {
-                                g_relay_expiration.emplace_back(current_time + RELAY_TX_CACHE_TIME, ret.first);
-                            }
-                            // Add wtxid-based lookup into mapRelay as well, so that peers can request by wtxid
-                            auto ret2 = mapRelay.emplace(wtxid, ret.first->second);
-                            if (ret2.second) {
-                                g_relay_expiration.emplace_back(current_time + RELAY_TX_CACHE_TIME, ret2.first);
-                            }
-                        }
                         if (vInv.size() == MAX_INV_SZ) {
                             m_connman.PushMessage(pto, msgMaker.Make(NetMsgType::INV, vInv));
                             vInv.clear();

test/functional/p2p_leak_tx.py

@@ -4,8 +4,8 @@
 # file COPYING or http://www.opensource.org/licenses/mit-license.php.
 """Test transaction upload"""
 
-from test_framework.messages import msg_getdata, CInv, MSG_TX
-from test_framework.p2p import p2p_lock, P2PDataStore
+from test_framework.messages import msg_getdata, CInv, MSG_TX, MSG_WTX
+from test_framework.p2p import p2p_lock, P2PDataStore, P2PTxInvStore
 from test_framework.test_framework import BitcoinTestFramework
 from test_framework.util import (
     assert_equal,
@@ -27,6 +27,7 @@ def run_test(self):
         self.miniwallet = MiniWallet(self.gen_node)
 
         self.test_tx_in_block()
+        self.test_notfound_on_replaced_tx()
         self.test_notfound_on_unannounced_tx()
 
     def test_tx_in_block(self):
@@ -45,8 +46,36 @@ def test_tx_in_block(self):
         inbound_peer.send_and_ping(want_tx)
         assert_equal(inbound_peer.last_message.get("tx").tx.getwtxid(), wtxid)
 
+    def test_notfound_on_replaced_tx(self):
+        self.gen_node.disconnect_p2ps()
+        inbound_peer = self.gen_node.add_p2p_connection(P2PTxInvStore())
+
+        self.log.info("Transaction tx_a is broadcast")
+        tx_a = self.miniwallet.send_self_transfer(from_node=self.gen_node)
+        inbound_peer.wait_for_broadcast(txns=[tx_a["wtxid"]])
+
+        tx_b = tx_a["tx"]
+        tx_b.vout[0].nValue -= 9000
+        self.gen_node.sendrawtransaction(tx_b.serialize().hex())
+
+        self.log.info("Re-request of tx_a after replacement is answered with notfound")
+        req_vec = [
+            CInv(t=MSG_TX, h=int(tx_a["txid"], 16)),
+            CInv(t=MSG_WTX, h=int(tx_a["wtxid"], 16)),
+        ]
+        want_tx = msg_getdata()
+        want_tx.inv = req_vec
+        with p2p_lock:
+            inbound_peer.last_message.pop("notfound", None)
+            inbound_peer.last_message.pop("tx", None)
+        inbound_peer.send_and_ping(want_tx)
+
+        assert_equal(inbound_peer.last_message.get("notfound").vec, req_vec)
+        assert "tx" not in inbound_peer.last_message
+
     def test_notfound_on_unannounced_tx(self):
         self.log.info("Check that we don't leak txs to inbound peers that we haven't yet announced to")
+        self.gen_node.disconnect_p2ps()
         inbound_peer = self.gen_node.add_p2p_connection(P2PNode())  # An "attacking" inbound peer
 
         MAX_REPEATS = 100