[net] split PushInventory()

PushInventory() is currently called with a CInv object, which can be a
MSG_TX or MSG_BLOCK. PushInventory() only uses the type to determine
whether to add the hash to setInventoryTxToSend or
vInventoryBlockToSend.

Since the caller always knows what type of inventory they're pushing,
the CInv is wastefully constructed and thrown away, and tx/block relay
is being split out, we split the function into PushTxInventory() and
PushBlockInventory().

Author: jnewbery

src/net.h

@@ -973,19 +973,21 @@ class CNode
         }
     }
 
-    void PushInventory(const CInv& inv)
+    void PushTxInventory(const uint256& hash)
     {
-        if (inv.type == MSG_TX && m_tx_relay != nullptr) {
-            LOCK(m_tx_relay->cs_tx_inventory);
-            if (!m_tx_relay->filterInventoryKnown.contains(inv.hash)) {
-                m_tx_relay->setInventoryTxToSend.insert(inv.hash);
-            }
-        } else if (inv.type == MSG_BLOCK) {
-            LOCK(cs_inventory);
-            vInventoryBlockToSend.push_back(inv.hash);
+        if (m_tx_relay == nullptr) return;
+        LOCK(m_tx_relay->cs_tx_inventory);
+        if (!m_tx_relay->filterInventoryKnown.contains(hash)) {
+            m_tx_relay->setInventoryTxToSend.insert(hash);
         }
     }
 
+    void PushBlockInventory(const uint256& hash)
+    {
+        LOCK(cs_inventory);
+        vInventoryBlockToSend.push_back(hash);
+    }
+
     void PushBlockHash(const uint256 &hash)
     {
         LOCK(cs_inventory);

src/net_processing.cpp

@@ -1419,10 +1419,9 @@ bool static AlreadyHave(const CInv& inv, const CTxMemPool& mempool) EXCLUSIVE_LO
 
 void RelayTransaction(const uint256& txid, const CConnman& connman)
 {
-    CInv inv(MSG_TX, txid);
-    connman.ForEachNode([&inv](CNode* pnode)
+    connman.ForEachNode([&txid](CNode* pnode)
     {
-        pnode->PushInventory(inv);
+        pnode->PushTxInventory(txid);
     });
 }
 
@@ -1608,7 +1607,7 @@ void static ProcessGetBlockData(CNode& pfrom, const CChainParams& chainparams, c
         // Trigger the peer node to send a getblocks request for the next batch of inventory
         if (inv.hash == pfrom.hashContinue)
         {
-            // Bypass PushInventory, this must send even if redundant,
+            // Bypass PushBlockInventory, this must send even if redundant,
             // and we want it right after the last block so they don't
             // wait for other stuff first.
             std::vector<CInv> vInv;
@@ -2657,7 +2656,7 @@ bool ProcessMessage(CNode& pfrom, const std::string& msg_type, CDataStream& vRec
                 LogPrint(BCLog::NET, " getblocks stopping, pruned or too old block at %d %s\n", pindex->nHeight, pindex->GetBlockHash().ToString());
                 break;
             }
-            pfrom.PushInventory(CInv(MSG_BLOCK, pindex->GetBlockHash()));
+            pfrom.PushBlockInventory(pindex->GetBlockHash());
             if (--nLimit <= 0)
             {
                 // When this block is requested, we'll send an inv that'll
@@ -4081,7 +4080,7 @@ bool PeerLogicValidation::SendMessages(CNode* pto)
 
                     // If the peer's chain has this block, don't inv it back.
                     if (!PeerHasHeader(&state, pindex)) {
-                        pto->PushInventory(CInv(MSG_BLOCK, hashToAnnounce));
+                        pto->PushBlockInventory(hashToAnnounce);
                         LogPrint(BCLog::NET, "%s: sending inv peer=%d hash=%s\n", __func__,
                             pto->GetId(), hashToAnnounce.ToString());
                     }